A geographical issue of Tokushima University gives the alarm on preparing for expected natural disasters near Nankai-Trough area. However, the university was slow to act so far according to several problems to be solved. The impact of the Great East Japan Earthquake in 2011 made us change our mind of the priority for investments relatively. The university has actually installed and prepared the BCP infrastructure with wireless communication networks on the whole. This paper describes such integrated environments taking geographical conditions into account.
","ja":"徳島大学は南海トラフ大地震に早急に備えるべき地理条件下にありながら，遅々として情報システムBCPの対策は進んでいなかった．東日本大震災での教訓を得てこの対策を進める機運は高まり，結果として平成25年度末までに情報システムに関するBCPの基盤整備とともに，非常時にも外乱を受けにくいユーザ向けアクセスラインを整備した．これらの対策は，平時にも活用できる環境となる．本論文では，徳島大学の地理条件や既存の基盤整備上のBCPに関する解決すべき課題を鑑みた要件定義およびシステム設計について論じる．特に，対災害という視点では，単一的な視点で語るべきではなく，総合的な視点が必要であるため，本論文では多面的なアプローチをとる"},"publication_date":"2014-09-19","publication_name":{"en":"Journal for Academic Computing and Networking","ja":"学術情報処理研究"},"volume":"Vol.18","number":"No.18","starting_page":"99","ending_page":"107","languages":["jpn"],"referee":true,"identifiers":{"doi":["10.24669/jacn.18.1_99"],"issn":["2188-9511"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:32, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/130004870044/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1390001204608142080/","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-84899800127&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=274586","label":"url"}],"paper_title":{"en":"Calculation Method of Local Bifurcation Point in Piecewise Nonlinear Discrete-Time Dynamical Systems","ja":"区分非線形離散時間力学系における局所的分岐点の計算法"},"authors":{"en":[{"name":"Tone, Yusuke"},{"name":"Asahara, Hiroyuki"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Aihara Kazuyuki"},{"name":"Kousaka Takuji"}],"ja":[{"name":"刀根 佑輔"},{"name":"麻原 寛之"},{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"合原 一幸"},{"name":"高坂 拓司"}]},"description":{"en":"This paper proposes a calculation method of local bifurcation points for discrete-time dynamical systems with piecewise nonlinear characteristic (PNDDS). First, an n-dimensional PNDDS, which has two piecewise nonlinear maps, is shown and its variational equation is defined. Next, the calculation method of the local bifurcation points is proposed using the conditional equation of the periodic solution and the characteristic equation. Here, we have to calculate derivatives of the map with an initial value and with a bifurcation parameter to obtain the bifurcation points continuously in the parameter space. The above calculation process is a key of the proposed method, and we explain it in detail. Finally, we apply the proposed method to a two-dimensional PNDDS and calculate the local bifurcation points for confirming its validity.","ja":"This paper proposes a calculation method of local bifurcation points for discrete-time dynamical systems with piecewise nonlinear characteristic (PNDDS). First, an n-dimensional PNDDS, which has two piecewise nonlinear maps, is shown and its variational equation is defined. Next, the calculation method of the local bifurcation points is proposed using the conditional equation of the periodic solution and the characteristic equation. Here, we have to calculate derivatives of the map with an initial value and with a bifurcation parameter to obtain the bifurcation points continuously in the parameter space. The above calculation process is a key of the proposed method, and we explain it in detail. Finally, we apply the proposed method to a two-dimensional PNDDS and calculate the local bifurcation points for confirming its validity."},"publication_date":"2014-05-01","publication_name":{"en":"IEEJ Transactions on Electronics, Information and Systems","ja":"電気学会論文誌C (電子，情報，システム部門誌)"},"volume":"Vol.134-C","number":"No.5","starting_page":"729","ending_page":"736","languages":["jpn"],"referee":true,"identifiers":{"doi":["10.1541/ieejeiss.134.729"],"issn":["0385-4221"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:33, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/113430","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-84906786692&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=276409","label":"url"}],"paper_title":{"en":"Melnikov integral formula for beam sea roll motion utilizing a non-Hamiltonian exact heteroclinic orbit: analytic extension and numerical validation","ja":"Melnikov integral formula for beam sea roll motion utilizing a non-Hamiltonian exact heteroclinic orbit: analytic extension and numerical validation"},"authors":{"en":[{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"},{"name":"上田 哲史"}]},"description":{"en":"In the research field of nonlinear dynamical system theory, it is well known that a homoclinic/heteroclinic point leads to unpredictable motions, such as chaos. Melnikov's method enables us to judge whether the system has a homoclinic/heteroclinic orbit. Therefore, in order to assess a vessel's safety with respect to capsizing, Melnikov's method has been applied for investigations of the chaos that appears in beam sea rolling. This is because chaos is closely related to capsizing incidents. In a previous paper (Maki et al. in J Mar Sci Technol 15:102 106 2010), a formula to predict the capsizing boundary by applying Melnikov's method to analytically obtain the non-Hamiltonian heteroclinic orbit was proposed. However, in that paper, only limited numerical investigation was carried out. Therefore, further comparative research between the analytical and numerical results is conducted, with the result being that the formula is validated.","ja":"船の横揺れ現象に現れるカオス現象は，船舶の転覆と密接な関係があるため，古くから研究の対象となってきた，本研究では，これまでに著者らが提案した転覆限界を見積もるための理論計算手法と数値実験結果を比較した．その結果，理論的に求めた転覆限界を示すパラメータ値において，初期値平面のフラクタル的浸食が生じることを確認し，手法の妥当性を確認した．"},"publication_date":"2014-03-06","publication_name":{"en":"Journal of Marine Science and Technology","ja":"Journal of Marine Science and Technology"},"volume":"Vol.19","number":"No.3","starting_page":"257","ending_page":"264","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1007/s00773-013-0244-z"],"issn":["0948-4280"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:34, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/113431","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-84912126257&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=276408","label":"url"}],"paper_title":{"en":"Analytical methods to predict the surf-riding threshold and the wave-blocking threshold in astern seas","ja":"Analytical methods to predict the surf-riding threshold and the wave-blocking threshold in astern seas"},"authors":{"en":[{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"},{"name":"Martin Renilson"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"},{"name":"Martin Renilson"},{"name":"上田 哲史"}]},"description":{"en":"For the safe design and operation of high-speed craft, it is important to predict the behavior of these craft in following and astern quartering seas as it is well known that serious problems can occur when a vessel is forced by the waves to travel at wave speed. The surf-riding threshold is the lower speed limit above which the vessel will be forced to travel at wave speed (usually on the face of the wave) which is generally accepted to be a prerequisite for broaching. While a vessel travelling below this speed will experience significant changes in its longitudinal speed in the wave, it will not be forced to travel at wave speed. For high-speed craft, the wave-blocking threshold also becomes important. This is the upper speed, below which the vessel will also be forced to travel at wave speed (usually on the back of the wave) and is related to the possibility of bow diving. By the application of a polynomial approximation to the waveinduced surge force, including the nonlinear surge equation, an analytical formula to predict both the surf-riding and the wave-blocking thresholds is proposed. Comparative results of the surf-riding threshold and wave-blocking threshold predicted utilizing the proposed formula and the thresholds predicted using numerical bifurcation analysis indicate fairly good agreement. In addition, previously proposed analytical formulae are examined.","ja":"追波中の波乗り現象の発生及び消失の境界を求めるため，理論的・実験的検討を行った．その中で，前後揺れ方程式の非線形項を多項式近似することにより，新たな波乗り限界推定公式を導き，実験との比較を行った．その結果，今回提案した手法は，実験結果をよく説明することが分かった．"},"publication_date":"2014-02-27","publication_name":{"en":"Journal of Marine Science and Technology","ja":"Journal of Marine Science and Technology"},"volume":"Vol.19","number":"No.4","starting_page":"415","ending_page":"424","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1007/s00773-014-0257-2"],"issn":["0948-4280"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:35, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797819"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/130004849309/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1390001204465040512/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=272591","label":"url"}],"paper_title":{"en":"Classification of Bifurcations and Oscillations in Coupled BVP Oscillators","ja":"BVP発振器の結合方式による分岐と発振の分類"},"authors":{"en":[{"name":"Nishiuchi, Yusuke"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"西内 悠祐"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"Bonoh¨oeffer-van der Pol (BVP) oscillator is a planer nonlinear model exhibiting a rich variety of bifurcation phenomena for both equilibria and limit cycles. Since it has two ports regarding its state variables, many topologically different coupled systems are obtained even when two identical BVP oscillators are resistively coupled. Although individual coupled systems have been already studied, it is not able to compare them because models of nonlinearity and normalizations are different. In this paper, we firstly unify them, and investigate their bifurcations of equilibria and synchronization modes of limit cycles. As results, common bifurcations of equilibria for all coupled structures are found, and some properties on parameter ranges, synchronization modes and their stabilities are clarified.","ja":"BVP発振器は，電圧ポート，電流ポートをもち，発振器同士の結合系を校正することにより，様々な周期解やそれらの同期，カオスなどが生じる．本研究ではこれらの 結合方式に対し同一の非線形抵抗特性と正規化方程式 を用い，平衡点・周期解の分岐図を求めた．その結果， 全ての結合方式において共通する平衡点の分岐が存在 し，発振現象の発生するパラメータ領域や同期モード， 安定性に結合方式の特徴が現れることが分かった．"},"publication_date":"2014-01-25","publication_name":{"en":"Journal of Signal Processing","ja":"Journal of Signal Processing"},"volume":"Vol.18","number":"No.1","starting_page":"39","ending_page":"48","languages":["jpn"],"referee":true,"identifiers":{"doi":["10.2299/jsp.18.39"],"issn":["1342-6230"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:36, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"http://www.sciencedirect.com/science/article/pii/S0960077912001774","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112038","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=253359","label":"url"}],"paper_title":{"en":"Bifurcation Analysis of a Simple 3D Oscillator and Chaos Synchronization of its Coupled Systems","ja":"Bifurcation Analysis of a Simple 3D Oscillator and Chaos Synchronization of its Coupled Systems"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Tamura, Akihisa"}],"ja":[{"name":"上田 哲史"},{"name":"Tamura, Akihisa"}]},"description":{"en":"Tamasevicius et al. proposed a simple 3d chaotic oscillator for educational purpose. In fact the oscillator can be implemented very easily and it shows typical bifurcation scenario so that it is a suitable training object for introductory education for students. However, as far as we know, no concrete studies on bifurcations or applications on this oscillator have been investigated. In this paper, we make a thorough investigation on local bifurcations of periodic solutions in this oscillator by using a shooting method. Based on results of the analysis, we study chaos synchronization phenomena in diffusively coupled oscillators. Both bifurcation sets of periodic solutions and parameter regions of in-phase synchronized solutions are revealed. An experimental laboratory of chaos synchronization is also demonstrated.","ja":"Tamasevicius らはダイオードとインバータからなる簡素な構成の3階自律系カオス発振器を提案している．これは周期解の典型的な局所分岐シナリオを呈し，学生実験などで適切な素材であると言われている．しかしながらその分岐構造や応用はまだ報告されていない．そこでわれわれは局所分岐を大域的なパラメータ平面について求め，分岐構造を明らかにした．また，それらの結合系におけるカオス同期化現象について，その存在パラメータ範囲などを分岐図を通じて明らかにした．"},"publication_date":"2012-12","publication_name":{"en":"Chaos, Solitons & Fractals","ja":"Chaos, Solitons & Fractals"},"volume":"Vol.45","number":"No.12","starting_page":"1460","ending_page":"1468","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1016/j.chaos.2012.08.007"],"issn":["0960-0779"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:37, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797820"},"force":{"see_also":[{"@id":"https://www.jstage.jst.go.jp/article/nolta/3/4/3_497/_article","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/114910","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=248207","label":"url"}],"paper_title":{"en":"Bifurcation analyses of nonlinear dynamical systems: From theory to numerical computations","ja":"Bifurcation analyses of nonlinear dynamical systems: From theory to numerical computations"},"authors":{"en":[{"name":"Tsumoto Kunichika"},{"name":"Ueta Tetsushi"},{"name":"Yoshinaga Tetsuya"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"津元 国親"},{"name":"上田 哲史"},{"name":"吉永 哲哉"},{"name":"川上 博"}]},"description":{"en":"In this paper, we explain how to compute bifurcation parameter values of periodic solutions for non-autonomous nonlinear differential equations. Although various approaches and tools are available for this problem nowadays, we introduce the simplest method composed by computational algorithms appeared in textbooks for beginner's, i.e., the Newton's method and Runge-Kutta method. We formulate the given bifurcation problem as a boundary value problem and use the Newton's method as a solver consistently. All derivatives required in each iteration are obtained by solving variational equations about the state and the parameter. Thank to quadratic convergence ability of the Newton's method, accurate results can be obtained without using any sophisticated mathematical library or software. If a discontinuous periodic force is applied to the system, we can take the same strategy to solve the bifurcation problem. The key point of this method is deriving a differentiable composite map from consideration of the various information about the problem such as the location of sections, the periodicity, the Poincaré mapping, and so on.","ja":"非線形非自律系を例に周期解の分岐の計算方法について解説する．現在まで多くの分岐解析手法・計算方法が提案されているが，初学者にとって取っ付き易いと思われるニュートン法とルンゲクッタ法のみを用いた簡単でかつパワフルな手法を紹介する．分岐問題をまず2点境界値問題として定式化し，ニュートン法を適用する．その際必要な写像の微分値などは，変分方程式の数値積分によって与えられる．これの手法は特別な数値解析ツールを一切使用しない．"},"publication_date":"2012-10","publication_name":{"en":"Nonlinear Theory and Its Applications, IEICE","ja":"Nonlinear Theory and Its Applications, IEICE"},"volume":"Vol.3","number":"No.4","starting_page":"458","ending_page":"476","languages":["eng"],"referee":true,"invited":true,"identifiers":{"doi":["10.1587/nolta.3.458"],"issn":["2185-4106"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:38, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797821"},"force":{"see_also":[{"@id":"https://www.jstage.jst.go.jp/article/nolta/3/4/3_497/_article","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/114911","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=248204","label":"url"}],"paper_title":{"en":"Invariant patterns in a non-invertible chaotic map by the directional coloring","ja":"Invariant patterns in a non-invertible chaotic map by the directional coloring"},"authors":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"description":{"en":"We propose a visualization method called the directional coloring for chaotic attractors in planer discrete systems. A color in the hue circle is assigned to the argument determined by the current point and its n-th mapped point. Some unstable n-periodic points embedded in the chaotic attractor become visible as radiation points and they can be accurately detected by combination of this coloring and the Newton's method. For a chaotic attractor in a non-invertible map, we found out invariant patterns around the fixed point and detect its nearest unstable n-periodic point. The computed results of their locations show a fractal property of the system.","ja":"写像方向に応じてHSV表色系をマッピングする方向彩色法を提案する．あるカオス的2次元非可逆写像に適用したところ，状態空間にフラクタルなパターンを得ることができた．視覚的にも明瞭なドメインができ，ドメインの集積点には周期点が存在することも明らかになった．これらの情報をもとに，対象の写像のフラクタルを定量化することができた．"},"publication_date":"2012-10","publication_name":{"en":"Nonlinear Theory and Its Applications, IEICE","ja":"Nonlinear Theory and Its Applications, IEICE"},"volume":"Vol.3","number":"No.4","starting_page":"497","ending_page":"507","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1587/nolta.3.497"],"issn":["2185-4106"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:39, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797822"},"force":{"see_also":[{"@id":"http://repo.lib.tokushima-u.ac.jp/115740","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/115740","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1390845713038666624/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=256931","label":"url"}],"paper_title":{"en":"Proposing User Experience based on WEB-SSO with Multiple Backends of Authentication/Authorization Engine","ja":"複数認証基盤に対応する複合SSO環境でのユーザエクスペリエンス"},"authors":{"en":[{"name":"Matsuura Kenji"},{"name":"Ueta Tetsushi"},{"name":"Sano Masahiko"}],"ja":[{"name":"松浦 健二"},{"name":"上田 哲史"},{"name":"佐野 雅彦"}]},"description":{"en":"個人のIDが複数存在する場合の個人認証には，単一の認証源に登録されている場合だけでなく，複数の異なる内容での認証源に登録されている事もある．これをシングルサインオンのバックエンド情報源として利用する際には，その特性や扱う属性に注意しながら慎重に実装しなければならない．これらはセキュリティを考慮しつつ利便性および対障害性を高めるための設計方針および運用方針を要し，本論文では本学での実装について述べる．さらに，異なるシングルサインオン技術を用いた異なるカテゴリでの統合的な操作環境について述べる．","ja":"個人のIDが複数存在する場合の個人認証には，単一の認証源に登録されている場合だけでなく，複数の異なる内容での認証源に登録されている事もある．これをシングルサインオンのバックエンド情報源として利用する際には，その特性や扱う属性に注意しながら慎重に実装しなければならない．これらはセキュリティを考慮しつつ利便性および対障害性を高めるための設計方針および運用方針を要し，本論文では本学での実装について述べる．さらに，異なるシングルサインオン技術を用いた異なるカテゴリでの統合的な操作環境について述べる．"},"publication_date":"2012-09-14","publication_name":{"en":"Journal for Academic Computing and Networking","ja":"学術情報処理研究"},"volume":"Vol.16","number":"No.16","starting_page":"138","ending_page":"145","languages":["jpn"],"referee":true,"identifiers":{"doi":["10.24669/jacn.16.1_138"],"issn":["1343-2915"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:40, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/110008687309/","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110725","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1050564287419585024/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=227495","label":"url"}],"paper_title":{"en":"Bifurcation analysis with threshold values for interrupt autonomous systems","ja":"断続自律系方程式における分岐のしきい値解析"},"authors":{"en":[{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"合原 一幸"}]},"description":{"en":"スイッチや状態変数の跳躍で表される断続力学系の研究が盛んに行われている．複数の異なるベク トル場が接合して力学系を構成する場合，しばしばしきい値が接合面(断続面)の位置を決める条件となる．系 に現れる周期軌道は，しきい値をパラメタとしたとき，その値の変化に対して様々な分岐現象を生じる．状態変 数やパラメタが断続面において微分不可能となる断続系では，従来の解析手法の適用に困難をもたらすが，断続 面を局所断面とし局所座標系を構成するPoincare 写像を定義すれば，シューティング法による分岐解析が行な えることが示されている．しかしながら，しきい値の定義式は一般にモデル方程式に陽に含まれないため，分岐 パラメタ値としてのしきい値に対するシューティング解法は知られていない．本論文では，断続系の分岐理論を 拡張し，しきい値をパラメタとする変分方程式を導出し，求積する手法について述べる．さらに，具体例として 結合Izhikevich ニューロンモデルを取り上げ，分岐構造の詳細を説明する","ja":"スイッチや状態変数の跳躍で表される断続力学系の研究が盛んに行われている．複数の異なるベク トル場が接合して力学系を構成する場合，しばしばしきい値が接合面(断続面)の位置を決める条件となる．系 に現れる周期軌道は，しきい値をパラメタとしたとき，その値の変化に対して様々な分岐現象を生じる．状態変 数やパラメタが断続面において微分不可能となる断続系では，従来の解析手法の適用に困難をもたらすが，断続 面を局所断面とし局所座標系を構成するPoincare 写像を定義すれば，シューティング法による分岐解析が行な えることが示されている．しかしながら，しきい値の定義式は一般にモデル方程式に陽に含まれないため，分岐 パラメタ値としてのしきい値に対するシューティング解法は知られていない．本論文では，断続系の分岐理論を 拡張し，しきい値をパラメタとする変分方程式を導出し，求積する手法について述べる．さらに，具体例として 結合Izhikevich ニューロンモデルを取り上げ，分岐構造の詳細を説明する"},"publication_date":"2011-08-01","publication_name":{"en":"The Transactions of the Institute of Electronics, Information and Communication Engineers A","ja":"電子情報通信学会論文誌(A)"},"volume":"Vol.J94-A","number":"No.8","starting_page":"596","ending_page":"603","languages":["jpn"],"referee":true,"identifiers":{"issn":["0913-5707"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:41, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/10027717398/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1570854176225674240/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=214732","label":"url"}],"paper_title":{"en":"Analytical formulae for predicting the surf-riding threshold for a ship in following seas","ja":"Analytical formulae for predicting the surf-riding threshold for a ship in following seas"},"authors":{"en":[{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"},{"name":"Renilson, Martin"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"},{"name":"Renilson, Martin"},{"name":"上田 哲史"}]},"description":{"en":"Making use of Melnikov's method, a generalized formula for predicting the surf-riding threshold is developed as an extension to the applications of Kan and Spyrou. A new analytical formula for calculating the surfriding threshold of a ship in following seas is also proposed in light of nonlinear dynamical system theory. By applying a continuous piecewise linear approximation to the waveinduced surge force, a heteroclinic bifurcation point is obtained analytically with an uncoupled surge equation. Results calculated using these formulae are presented, and they show good agreement with those obtained utilizing numerical bifurcation analysis. Further, it was confirmed that the surf-riding threshold obtained using the proposed formulae agrees reasonably well with that obtained experimentally for an unconventional vessel.","ja":"追波中での波乗り現象の発生を予測する手法を得るため，非線形力学系理論の観点から検討を実施した．その中で，前後揺れ方程式中の非線形項を区分的に線形化することにより，波乗りの限界を理論的に見積もる手法を提案し，実験により検証を行い，その有効性を確認した．"},"publication_date":"2010-08-01","publication_name":{"en":"Journal of Marine Science and Technology","ja":"Journal of Marine Science and Technology"},"volume":"Vol.15","number":"No.3","starting_page":"218","ending_page":"229","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1007/s00773-010-0085-y"],"issn":["0948-4280"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:42, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-73249132565&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=188810","label":"url"}],"paper_title":{"en":"Bifurcation Analysis of Izhikevich Neuron Model","ja":"Bifurcation Analysis of Izhikevich Neuron Model"},"authors":{"en":[{"name":"Tamura, Akihisa"},{"name":"Ueta Tetsushi"},{"name":"Tsuji Shigeki"}],"ja":[{"name":"田村 彰寿"},{"name":"上田 哲史"},{"name":"辻 繁樹"}]},"description":{"en":"An autonomous differential equation with jumps has been proposed by Izhikevich for a demonstration of various spiking waves by changing its parameters. Some well-known firing patterns of this model are shown by numerical simulations, however bifurcation analysis of the model has not been investigated in detail. In this paper, we apply our numerical computation algorithm to this model. Although it is a challenge to manage jumps with the Poincar´e mapping and we obtain bifurcation parameter values by a shooting method. As a result, we conclude that some spiking modes are caused by local bifurcation of limit cycles.","ja":"状態にジャンプを伴うイジケビッチが提案した自律系神経モデルは，系のパラメータを変化させると，自然界で観測される様々なスパイク・バースト振動モードを再現する．われわれはこのモデルに関する分岐問題を解く．幾つかのスパイクの変遷は分岐現象によって説明できることを示す．"},"publication_date":"2009-12","publication_name":{"en":"Dynamics of Continuous, Discrete and Impulsive Systems. Series A: Mathematical Analysis","ja":"Dynamics of Continuous, Discrete and Impulsive Systems. Series A: Mathematical Analysis"},"volume":"Vol.16","number":"No.6","starting_page":"849","ending_page":"862","languages":["eng"],"referee":true,"identifiers":{"issn":["1201-3390"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:43, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"http://dcdis001.watam.org/volumes/fulltext_a_pdf/2009v16/v16n6a-pdf/811-824s4.pdf","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-73249140949&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=188811","label":"url"}],"paper_title":{"en":"Bifurcations observed in BVP oscillator with periodically switched RC circuit","ja":"Bifurcations observed in BVP oscillator with periodically switched RC circuit"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Fujimoto Ken'ichi"},{"name":"MA YUE"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"藤本 憲市"},{"name":"馬 躍"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"Many works have been devoted to the study of the behavior of the Bonhoe er-van der Pol (BVP) oscillator in physiological and biochemical modeling studies. In this paper, bifurcation and chaos in BVP oscillator, which is intermittently connected to a parallel RC load, is investigated. By using the periodicity of switching action we introduce a composite discrete mapping as the Poincar´e mapping that is useful for the analysis of piecewise nonlinear systems. Adjusting the switching period close to the integral multiple of the period of self-oscillation, we find various synchronizations. In particular the fundamental synchronization is discussed. Under the appropriate switching ratios, we illustrate that the synchronized state bifurcates to chaotic states by the period doubling cascades or the torus breaking down.","ja":"RCサブ回路に断続的に接続するBVP発振器の分岐問題について検討する．スイッチの周期に合わせたポアンカレ写像を考えることにより，可微分な合成写像を導くことができ，解析が進められる．自然周期に近いスイッチ周波数を選べば，様々な同期現象が認められる．周期解ロック領域，準周期解領域，カオス領域等を分岐図で説明する．"},"publication_date":"2009-11","publication_name":{"en":"Dynamics of Continuous, Discrete and Impulsive Systems. Series A: Mathematical Analysis","ja":"Dynamics of Continuous, Discrete and Impulsive Systems. Series A: Mathematical Analysis"},"volume":"Vol.16","number":"No.6","starting_page":"811","ending_page":"824","languages":["eng"],"referee":true,"identifiers":{"issn":["1201-3390"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:44, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/10027717179/","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/113429","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1571417126178539904/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=203570","label":"url"}],"paper_title":{"en":"Melnikov integral formula for beam sea roll motion utilizing a non-Hamiltonian exact heteroclinic orbit","ja":"Melnikov integral formula for beam sea roll motion utilizing a non-Hamiltonian exact heteroclinic orbit"},"authors":{"en":[{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"},{"name":"上田 哲史"}]},"description":{"en":"The chaos that appears in the ship roll equation in beam seas known as the escape equation has been intensively investigated because it is closely related to capsizing incidents. In particular, many applications of the Melnikov integral formula have been reported in the literature; however, in all the analytical works concerning the escape equation, the Melnikov integral is formulated utilizing a separatrix for the Hamiltonian part or a numerically obtained heteroclinic orbit for the non-Hamiltonian part of the original escape equation. To overcome such limitations, this article attempts to utilise an analytical expression for the non-Hamiltonian part. As a result, an analytical procedure is provided that makes use of a heteroclinic orbit of the non-Hamiltonian part within the framework of the Melnikov integral formula.","ja":"船の横揺れ現象に現れるカオス現象は，船舶の転覆と密接な関係があるため，古くから研究の対象となってきた，本研究では，非線形横揺れ運動方程式(転覆方程式)のノンハミルトニアン部の解を解析的に求め，それについてメルニコフの手法を適用することで転覆の限界を得た．"},"publication_date":"2009-10-25","publication_name":{"en":"Journal of Marine Science and Technology","ja":"Journal of Marine Science and Technology"},"volume":"Vol.15","number":"No.1","starting_page":"102","ending_page":"106","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1007/s00773-009-0076-z"],"issn":["0948-4280"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:45, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112117","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=196197","label":"url"}],"paper_title":{"en":"Chaos Control Implementation by Interrupted Electric Circuit with Switching Delay","ja":"Chaos Control Implementation by Interrupted Electric Circuit with Switching Delay"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"MA YUE"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"馬 躍"}]},"description":{"en":"We have demonstrated that the chaotic circuit with a switching delay is modeled by a return map, and a controller for the suppression of chaos is proposed. A circuit representing a controller stabilizing a period-1 unstable periodic orbit in an interrupted electric circuit with a certain switching delay is also discussed.","ja":"スイッチの遅れを持つカオス回路においてリターンマップを定義し，カオスを抑制する制御器を提案した．具体的な該当する系において周期1の不安定周期軌道を安定化した．"},"publication_date":"2009-07-01","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.19","number":"No.7","starting_page":"2359","ending_page":"2362","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1142/S0218127409024128"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:46, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797823"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/40016607219/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1523951030828454912/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=186107","label":"url"}],"paper_title":{"en":"Submission and edition system orienting low-cost publishing of conference proceedings","ja":"低コスト会議録出版を志向する電子投稿・編集システム"},"authors":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"description":{"en":"国際会議，研究集会などの会議録を生成するシステムをウェブアプリケーション等と組み合 わせて実現した．投稿，査読，再投稿プロセスを，フリーウェアにパッチを施した投稿シス テムで運用する．内部で使用されるデータベースから必要な情報を取得し，各論文PDF へ のリンクを埋め込んだ講演プログラム目次ページを自動的に生成する．採択論文はPDFlib を用いてページ番号やロゴ，様々なページへのしおりが埋め込まれる．いくつかの会議で実 際に本システムを運用し，出版コストを金銭的にも人的にも低く抑えることができた．本稿 では上記システムの概要を報告する．","ja":"国際会議，研究集会などの会議録を生成するシステムをウェブアプリケーション等と組み合 わせて実現した．投稿，査読，再投稿プロセスを，フリーウェアにパッチを施した投稿シス テムで運用する．内部で使用されるデータベースから必要な情報を取得し，各論文PDF へ のリンクを埋め込んだ講演プログラム目次ページを自動的に生成する．採択論文はPDFlib を用いてページ番号やロゴ，様々なページへのしおりが埋め込まれる．いくつかの会議で実 際に本システムを運用し，出版コストを金銭的にも人的にも低く抑えることができた．本稿 では上記システムの概要を報告する．"},"publication_date":"2009-03","publication_name":{"en":"Academic Information Processing Environment Research","ja":"大学情報システム環境研究"},"volume":"Vol.12","starting_page":"27","ending_page":"33","languages":["jpn"],"referee":true,"identifiers":{"issn":["1343-9928"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:47, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=180097","label":"url"}],"paper_title":{"en":"Numerical Bifurcation Analysis Framework for Autonomous Piecewise-Smooth Dynamical Systems","ja":"Numerical Bifurcation Analysis Framework for Autonomous Piecewise-Smooth Dynamical Systems"},"authors":{"en":[{"name":"Brandon, Quentin"},{"name":"Ueta Tetsushi"},{"name":"Fournier-Prunaret, Daniele"},{"name":"Kousaka Takuji"}],"ja":[{"name":"Brandon, Quentin"},{"name":"上田 哲史"},{"name":"Fournier-Prunaret, Daniele"},{"name":"高坂 拓司"}]},"description":{"en":"In this paper, we consider a numerical method for the bifurcation analysis method of nonlinear piecewise-smooth systems. While linear piecewise-smooth systems can be analyzed rigorously, nonlinear piecewise-smooth systems cannot lead to an analytical solution. Derived from both continuous and discrete system analysis approaches, our method uses a Poincar´e map to transform the results of partial analysis over the continuous components into those issued from a discrete mapping. We then apply conventional methods in order to find critical parameter values and obtain bifurcation diagrams in the parameter space. The numerical procedure is fully described and illustrated by the analysis results of various versions of the Alpazur oscillator.","ja":"区分的に滑らかな(区分非線形な)自律系対する，統一的・数値的な分岐解析の手法を提案する．これらの系は解析解が求まらず，また断続点において微分が不可となる，解析が困難な系であるが，われわれは問題を，可微分な写像に変換し，その導関数や微分値も数値的に得ることができるため，統一的な手順でアトラクタの解析が行える．例としてAlpazur 発振器回路の特性を変更した様々なバージョンの回路について解析例を挙げる．"},"publication_date":"2009","publication_name":{"en":"Chaos, Solitons & Fractals","ja":"Chaos, Solitons & Fractals"},"volume":"Vol.42","number":"No.1","starting_page":"187","ending_page":"201","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1016/j.chaos.2008.11.013"],"issn":["0960-0779"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:48, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=158216","label":"url"}],"paper_title":{"en":"Bifurcation Analysis of Iterative Image Reconstruction Method for Computed Tomography","ja":"Bifurcation Analysis of Iterative Image Reconstruction Method for Computed Tomography"},"authors":{"en":[{"name":"Yoshinaga Tetsuya"},{"name":"Imakura, Yoshihiro"},{"name":"Fujimoto Ken'ichi"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"吉永 哲哉"},{"name":"Imakura, Yoshihiro"},{"name":"藤本 憲市"},{"name":"上田 哲史"}]},"description":{"en":"Of the iterative image reconstruction algorithms for computed tomography (CT), the power multiplicative algebraic reconstruction technique (PMART) is known to have good properties for speeding convergence and maximizing entropy. We analyze here bifurcations of fixed and periodic points that correspond to reconstructed images observed using PMART with an image made of multiple pixels and we investigate an extended PMART, which is a dynamical class for accelerating convergence. The convergence process for the state in the neighborhood of the true reconstructed image can be reduced to the property of a fixed point observed in the dynamical system. To investigate the speed of convergence, we present a computational method of obtaining parameter sets in which the given real or absolute values of the characteristic multiplier are equal. The advantage of the extended PMART is verified by comparing it with the standard multiplicative algebraic reconstruction technique (MART) using numerical experiments.","ja":"コンピュータトモグラフィーにおける反復画像再構成アルゴリズムとしてPMARTが広く知られている．本論文ではPMARTの反復過程を分岐問題と捉え，観測され固定点や周期点について解析する．また，加速アルゴリズムを付与したPMARTについても検討する．固定点問題を解き，分岐図を示すとともに，収束速度などの性能について言及する．MARTとの比較を行い，数値結果とともにPMARTの優位性を述べる．"},"publication_date":"2008-04-01","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.18","number":"No.4","starting_page":"1219","ending_page":"1225","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1142/S021812740802094X"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:49, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112115","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=104057","label":"url"}],"paper_title":{"en":"Bifurcation analysis of current coupled BVP oscillators","ja":"Bifurcation analysis of current coupled BVP oscillators"},"authors":{"en":[{"name":"Tsuji Shigeki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"辻 繁樹"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"合原 一幸"}]},"description":{"en":"The Bonhöffer van der Pol (BVP) oscillator is a simple circuit implementation describing neuronal dynamics. Lately the diffusive coupling structure of neurons attracts much attention since the existence of the gap-junctional coupling has been confirmed in the brain. Such coupling is easily realized by linear resistors for the circuit implementation, however, there are not enough investigations about diffusively coupled BVP oscillators, even a couple of BVP oscillators. We have considered several types of coupling structure between two BVP oscillators, and discussed their dynamical behavior in preceding works. In this paper, we treat a simple structure called current coupling and study their dynamical properties by the bifurcation theory. We investigate various bifurcation phenomena by computing some bifurcation diagrams in two cases, symmetrically and asymmetrically coupled systems. In symmetrically coupled systems, although all internal elements of two oscillators are the same, we obtain in-phase, anti-phase solution and some chaotic attractors. Moreover, we show that two quasi-periodic solutions disappear simultaneously by the homoclinic bifurcation on the Poincaré map, and that a large quasi-periodic solution is generated by the coalescence of these quasi-periodic solutions, but it disappears by the heteroclinic bifurcation on the Poincaré map. In the other case, we confirm the existence a conspicuous chaotic attractor in the laboratory experiments.","ja":"BVP発振器はニューロンを模擬するシンプルなモデルである．BVP発振器はその独立変数に応じたポートが存在し，複数のBVP発振器をこれらのポートを通じて結合させると様々な力学的特性を表現できる．本論文は2つのBVP発振器の電流ポート同士を抵抗で結合した系の分岐問題を検討する．特徴的な結果として，周期解の逆相同期が安定に存在することが分岐図より示されることが挙げられる．"},"publication_date":"2007-03","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.17","number":"No.3","starting_page":"837","ending_page":"850","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1142/S0218127407017586"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:50, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797824"},"force":{"see_also":[{"@id":"http://www.cue.tokushima-u.ac.jp/FD/journal2006miyoshi.pdf","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/82383","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1050564287417193344/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=139300","label":"url"}],"paper_title":{"en":"Construction of e-Syllabus Supporting the Discovery of Learning Path by Using EDB","ja":"EDBを利用した学習経路探索を支援するeシラバスシステムの構築"},"authors":{"en":[{"name":"Miyoshi Yasuo"},{"name":"Oie Takahiro"},{"name":"Ueta Tetsushi"},{"name":"Hirotomo Masanori"},{"name":"Yano Yoneo"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"三好 康夫"},{"name":"大家 隆弘"},{"name":"上田 哲史"},{"name":"廣友 雅徳"},{"name":"矢野 米雄"},{"name":"川上 博"}]},"description":{"en":"In Tokushima University, the syllabus has been published and opened on the web using an Educator and Researcher Information Database (EDB). We are now developing an e-Syllabus system that represents graphically and dynamically the relationships between lectures. This development represents one of the improvements of infrastructure for education and learning. In order to construct the e-Syllabus, three new columns have been added to each lecture of the syllabus: keywords, preceding lectures and relational lectures. XML is used as a storage format for EDB; it allows us to represent the structured data within on a text file that can be stored on a CD-ROM. Thus, without accessing the web, it is possible to represent graphically and discover the relations between the lectures. This representation of the syllabus supports the students in the discovery of learning-paths and the definition of learning plan. Thus, the e-Syllabus system improves the convenience of using the syllabus.","ja":"徳島大学では，教育・研究者情報データベース(EDB)が稼働しており，シラバスの作成やWeb閲覧に利用してきた．現在，教育と学習の基盤(教学インフラ)開発の1つとして，授業科目間の関連性を動的にグラフ表示するeシラバスシステムの構築を行っている．eシラバスの構築にあたり，各授業科目のシラバスに，キーワード，先行科目，関連科目の3つの項目を新たに設けた．EDBのデータ保存形式であるXMLは汎用性が高く，1つのテキストファイルで構造化データを表現できるため，配布されるCD-ROMにそのまま格納することで，Webを介さずに科目間の関連性をグラフ表示可能である．eシラバスの実現により，ネットワークを介して学習計画や学習経路探索が支援され，シラバスの使い勝手が向上する．"},"publication_date":"2006-03","publication_name":{"en":"Journal of University Education Research","ja":"大学教育研究ジャーナル"},"number":"No.3","starting_page":"1","ending_page":"9","languages":["jpn"],"referee":true,"identifiers":{"issn":["1881-1256"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:51, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-24344472635&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=121476","label":"url"}],"paper_title":{"en":"Stable torus and its bifurcation phenomena in a Three-Dimensional Autonomous Circuit","ja":"Stable torus and its bifurcation phenomena in a Three-Dimensional Autonomous Circuit"},"authors":{"en":[{"name":"Nishiuchi, Yusuke"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"Nishiuchi, Yusuke"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"It is well known that a stable torus is observed as a result after the system meets the super-critical Neimark Sacker bifurcation for a limit cycle. Although tori are easily observed in two-dimensional and periodically forced dynamical systems, there is a few papers about stable tori in three-dimensional autonomous systems. Besides, as physical circuit implementations, such circuits contain very special active elements, or have difficulty in realizing. In this paper, we show a very simple circuit of three-dimensional autonomous system, an extended Bonhöffer van der Pol (BVP) oscillator, which is demonstrating a stable torus. Firstly we explain a discovery of the torus in a computer simulation of the model equation. To implement it as a circuitry, we design a new nonlinear resistor. Although this contains an FET and an op-amp, it is simpler than any other nonlinear resistors proposed in previous papers. We confirm that this BVP oscillator can generate a stable torus in a real circuitry. We thoroughly investigate the bifurcation phenomena of various limit cycles and tori in this circuit, i.e., a super-critical Neimark Sacker and tangent bifurcations of limit cycles are concretely obtained, furthermore, phase locking and chaos regions are clarified in a bifurcation diagram.","ja":"安定なトーラスは通常，リミットサイクルの超臨界なNeimark-Sacker分岐を経て得られることが知られている．2次元非自律系では容易に観測されるトーラスではあるが，3次元自律系で安定なトーラスが観測される報告は多くなく，観測されたとしても極めて技巧的な能動素子を含んでいる．本論文では極めてシンプルなBVP発振器をもとに構成された3次元自律系回路で安定なトーラスが生じることを示す．またこのトーラスに関わる様々な局所分岐を計算し，分岐図として表した．"},"publication_date":"2006-02","publication_name":{"en":"Chaos, Solitons & Fractals","ja":"Chaos, Solitons & Fractals"},"volume":"Vol.27","number":"No.4","starting_page":"941","ending_page":"951","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1016/j.chaos.2005.04.092"],"issn":["0960-0779"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:52, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-24344480901&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=121475","label":"url"}],"paper_title":{"en":"Control of chaos in a piecewise smooth nonlinear system","ja":"Control of chaos in a piecewise smooth nonlinear system"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"MA YUE"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"馬 躍"},{"name":"川上 博"}]},"description":{"en":"This paper shows the stabilization of the unstable periodic orbit of any given piecewise smooth system with linear and/or nonlinear characteristics. By utilizing the periodicity of the switching action, we construct the Poincare´ mapping including all information of the original system. This mapping offers a first step toward extending a novel technique for controlling chaos based on the appropriate state feedback in piecewise smooth nonlinear systems. We also apply this approach to Rayleigh type oscillator described by the piecewise smooth nonlinear systems.","ja":"本論文では区分的に滑らかな非線形力学系におけるカオス中の不安定周期解を安定化する一般論を示す．スイッチ等の動作における周期性を利用し，ポアンカレ写像を構成し，これをカオス制御のフィードバックゲイン設計に用いる．レイリー発振器の区分非線形系にこの技術を適用し，制御可能であることを数値的に示す．"},"publication_date":"2006-02","publication_name":{"en":"Chaos, Solitons & Fractals","ja":"Chaos, Solitons & Fractals"},"volume":"Vol.27","number":"No.4","starting_page":"1019","ending_page":"1025","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1016/j.chaos.2005.04.068"],"issn":["0960-0779"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:53, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797825"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=123962","label":"url"}],"paper_title":{"en":"Bifurcation analysis of a piecewise smooth system with non-linear characteristics","ja":"Bifurcation analysis of a piecewise smooth system with non-linear characteristics"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"MA YUE"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"馬 躍"},{"name":"川上 博"}]},"description":{"en":"In previous works, there are no results about the bifurcation analysis for a piecewise smooth system with non-linear characteristics. The main purpose of this study is to calculate the bifurcation sets for a piecewise smooth system with non-linear characteristics. We first propose a new method to track the bifurcation sets in the system. This method derives the composite discrete mapping, Poincare mapping. As a result, it is possible to obtain the local bifurcation values in the parameter plane. As an illustrated example, we then apply this general methodology to the Rayleigh-type oscillator containing a stateperiod- dependent switch. In the circuit, we can find many subharmonic bifurcation sets including global bifurcations. We also show the bifurcation sets for the border-collision bifurcations. Some theoretical results are verified by laboratory experiments.","ja":"これまでにある非線形特性を伴う区分的に滑らかな力学系が知られているが，分岐解析についてまとまった結果は得られていない．そこで，新たな解析手法をもとに分岐集合を計算する．主な技術はポアンカレ写像に基づく合成写像の導入である．これにより，周期解の局所分岐を精度よく求めることができる．レイリー型の発振器について本技術を適用し，計算した結果を示す．また，border-collision 分岐の計算にも応用できることを示す．"},"publication_date":"2005-07","publication_name":{"en":"International Journal of Circuit Theory and Applications","ja":"International Journal of Circuit Theory and Applications"},"volume":"Vol.33","number":"No.4","starting_page":"263","ending_page":"279","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1002/cta.320"],"issn":["1097-007X"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:54, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797826"},"force":{"see_also":[{"@id":"http://repo.lib.tokushima-u.ac.jp/115742","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/115742","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1390001288156120704/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=101431","label":"url"}],"paper_title":{"en":"A Study of Database Support for enacting the Security Policy","ja":"セキュリティポリシ構築におけるデータベース支援に関する考察"},"authors":{"en":[{"name":"Sano Masahiko"},{"name":"Matsuura Kenji"},{"name":"Ueta Tetsushi"},{"name":"Oe Shunichiro"}],"ja":[{"name":"佐野 雅彦"},{"name":"松浦 健二"},{"name":"上田 哲史"},{"name":"大恵 俊一郎"}]},"description":{"en":"Various and many incidents, which like infections by the computer virus and leakage of personal information, threat our information society nowadays. The number of organization enacting the security policy for protecting themselves from those threats is rising. At the security policy planning, high cost and manpower are required for investigating their property and assessing their risk. Therefore, we have developed the security policy support database system to decreasing the cost of manpower. In this paper, we describe the requirements to construct a support database system and the results of out construction and operation.
","ja":"徳島大学では，平成15年よりセキュリティポリシ策定の活動を開始しているが，セキュリティポリシを策定する際の人的コスト(リスク分析，資産洗い出し，リスク評価)削減の方策として，資産登録及びリスク評価データベースを構築し，運用した結果，短期間で リスク分析を行うことができた．"},"publication_date":"2004-09-16","publication_name":{"en":"Journal for Academic Computing and Networking","ja":"学術情報処理研究"},"volume":"Vol.8","number":"No.8","starting_page":"25","ending_page":"32","languages":["jpn"],"referee":true,"identifiers":{"doi":["10.24669/jacn.8.1_25"],"issn":["1343-2915"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:55, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112113","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=96752","label":"url"}],"paper_title":{"en":"A design method of bursting using 2-parameter bifurcation diagrams in FitzHugh-Nagumo model","ja":"A design method of bursting using 2-parameter bifurcation diagrams in FitzHugh-Nagumo model"},"authors":{"en":[{"name":"Tsuji Shigeki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"辻 繁樹"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"合原 一幸"}]},"description":{"en":"Spiking and bursting observed in nerve membranes seem to be important when we investigate information representation model in the brain. Many topologically different bursting responses are observed in the mathematical models and their related bifurcation mechanisms have been clarified. In this paper, we propose a design method to generate bursting responses in FitzHugh Nagumo model with a simple periodic external force based on bifurcation analysis. Some effective parameter perturbations for the amplitude of the external input are given from the two-parameter bifurcation diagram.","ja":"脳における情報処理表現を検討する上で神経膜の興奮性に基づくスパイクやバースト発振の出現は重要である．これらの発振の定性的性質の分類はなされているが，われわれはFitzHugh-Nagumoの単独モデルに周期外力を印加するモデルを提案し，さまざまなバースト発振を設計できることを示す．"},"publication_date":"2004-07","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.14","number":"No.7","starting_page":"2241","ending_page":"2252","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1142/S0218127404010564"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:56, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/110003212982/","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110705","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1050845762396289280/","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-2342627371&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=80925","label":"url"}],"paper_title":{"en":"Performance of Chaos and Burst Noises Injected to the Hopfield NN for Quadratic Assignment Problems","ja":"Performance of Chaos and Burst Noises Injected to the Hopfield NN for Quadratic Assignment Problems"},"authors":{"en":[{"name":"Uwate Yoko"},{"name":"Nishio Yoshifumi"},{"name":"Ueta Tetsushi"},{"name":"Kawabe Tohru"},{"name":"Ikeguchi Tohru"}],"ja":[{"name":"上手 洋子"},{"name":"西尾 芳文"},{"name":"上田 哲史"},{"name":"Kawabe Tohru"},{"name":"Ikeguchi Tohru"}]},"description":{"en":"In this paper, performance of chaos and burst noises injected to the Hopfield Neural Network for quadratic assignment problems is investigated. For the evaluation of the noises, two methods to appreciate finding a lot of nearly optimal solutions are proposed. By computer simulations, it is confirmed that the burst noise generated by the Gilbert model with a laminar part and a burst part achieved the good performance as the intermittency chaos noise near the three-periodic window.","ja":"本論文では，二次割り当て問題を解く Hopfield Neural Network にカオスノイズとバーストノイズを注入した際の性能についての調査を行っている．さらに最適解に近い解をいかに多く見つけるかを判断すること ができる評価方法を提案している．コンピュータシミュレーションの結果，インターミッテンシー·カオスのラミナー部とバースト部の存在をモデリングしたギルバートモデルによって得られるバーストノイズが3周期窓付近のインターミッテンシー·カオスと同様のよい性能であることが確認されている．"},"publication_date":"2004-04-01","publication_name":{"en":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences","ja":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences"},"volume":"Vol.E87-A","number":"No.4","starting_page":"937","ending_page":"943","languages":["eng"],"referee":true,"identifiers":{"issn":["0916-8508"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:57, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112055","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=63603","label":"url"}],"paper_title":{"en":"Bifurcation and chaos in coupled BVP oscillators","ja":"Bifurcation and chaos in coupled BVP oscillators"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Miyazaki, Hisayo"},{"name":"Kousaka Takuji"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"Miyazaki, Hisayo"},{"name":"高坂 拓司"},{"name":"川上 博"}]},"description":{"en":"Bonh¨offer van der Pol(BVP) oscillator is a classic model exhibiting typical nonlinear phenomena in the planar autonomous system. This paper gives an analysis of equilibria, periodic solutions, strange attractors of two BVP oscillators coupled by a resister. When an oscillator is fixed its parameter values in nonoscillatory region and the others in oscillatory region, create the double scroll attractor due to the coupling. Bifurcation diagrams are obtained numerically from the mathematical model and chaotic parameter regions are clarified. We also confirm the existence of period-doubling cascades and chaotic attractors in the experimental laboratory.","ja":"抵抗で電圧結合された BVP 発振器系における平衡点および周期解の分岐について検討している．FETをインバータで特性反転させたものを非線形素子とすると，それはシグモイド関数をよく近似しており，単一のBVP回路においては硬い発振が観測される．十分大きい値の抵抗によりこれらを結合すると周期倍分岐，ピッチフォーク分岐を経て，カオスが生じる．回路パラメータからの数理モデルの導出とその数値計算結果を示し，結合系内部の抵抗値による2パラメータ平面における分岐集合を求めた．これらによりカオスの存在領域や，カオスの発生メカニズムが明らかとなった．また，数値計算結果は極めてよい精度で回路実験結果と合致することも確認された．"},"publication_date":"2004-03","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.14","number":"No.4","starting_page":"1305","ending_page":"1324","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1142/S0218127404009983"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:58, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/10011965852/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1390282679582944384/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=79859","label":"url"}],"paper_title":{"en":"Experimental Investigation of Controlling Chaos using Pole Assignment in the Forced BVP Oscillator","ja":"周期外力を印加したBVP発振器における極配置法に基づくカオス制御の実験的検討"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Yoshihito Yasuhara"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"安原 義仁"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"In previous work(1), we proposed a control method of the chaotic attractor in the non-autonomous systems and stabilized the unstable periodic orbits observed in the Duffing's equation. Our method can be used as a general technique for controlling chaos, however, the control function was not demonstrated in the laboratory experiments. With this in mind, in this paper, we consider the experimental control of the chaotic behavior in the circuit model, called the forced BVP oscillator. The pole assignment for the corresponding discrete system derived from such a non-autonomous system via Poincaré mapping works effectively, and the control unit is easily realized by the window comparator, sample-hold circuits, and so on. In particular, we try to stabilize the unstable 1 and 3-periodic orbits in the chaotic attractor in the numerical and experimental simulations.","ja":"強制BVP発振器におけるカオスについて，カオス制御器の実回路実装について検討する．ウィンドウコンパレータ，サンプルホールド器を使用し，極配置法に基づく制御器が実現される．幾つかの不安定周期軌道を本手法により安定化した．"},"publication_date":"2004-02-01","publication_name":{"en":"IEEJ Transactions on Electronics, Information and Systems","ja":"電気学会論文誌C (電子，情報，システム部門誌)"},"volume":"Vol.124-C","number":"No.2","starting_page":"495","ending_page":"501","languages":["jpn"],"referee":true,"identifiers":{"doi":["10.1541/ieejeiss.124.495"],"issn":["0385-4221"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:59, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=104594","label":"url"}],"paper_title":{"en":"Bifurcation of Burst Response in an Amari-Hopfield Neuron Pair with a Periodic External Force","ja":"Bifurcation of Burst Response in an Amari-Hopfield Neuron Pair with a Periodic External Force"},"authors":{"en":[{"name":"Tsuji, Shigeki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"Tsuji, Shigeki"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"合原 一幸"}]},"publication_date":"2004-02","publication_name":{"en":"Electrical Engineering in Japan","ja":"Electrical Engineering in Japan"},"volume":"Vol.146","number":"No.2","starting_page":"43","ending_page":"53","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1002/eej.10217"],"issn":["0424-7760"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:60, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797827"},"force":{"see_also":[{"@id":"http://id.nii.ac.jp/1107/00000166/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1050845762563877248/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=80769","label":"url"}],"paper_title":{"en":"Education and research database in Tokushima University --- Development and operation of the database orienting periodical publication and information disclosure","ja":"徳島大学における教職員データベース --- 定期刊行物· 情報公開を指向したシステム構築と運用"},"authors":{"en":[{"name":"Oie Takahiro"},{"name":"Ueta Tetsushi"},{"name":"Ochi Youji"},{"name":"Yano Yoneo"}],"ja":[{"name":"大家 隆弘"},{"name":"上田 哲史"},{"name":"越智 洋司"},{"name":"矢野 米雄"}]},"description":{"en":"大学機関では，紀要や各種総覧，シラバスなどの定期刊行物や，大学評価，外部評価，自己点検評価など，多くの報告書が編集され出版されている．これら出版物を制作するためのデータは，例えば学歴，職歴のように職員個人にとっては不変の情報であったり，著作リストのように既存のデータを追加するだけで済む情報である．しかし，個人のデータの記録書式や，編集者のデータ収集方法を統一することは困難であり，よって，出版物ごとにデータの再入力が強いられ，結果，編集・校正に長い期間を要し，データ入力者のみならず編集者にとっても多大な負担となる．そこで本学では，上記出版物の網羅すべき項目を洗いだし，「情報の再利用」を設計思想として，ユーザの入力と出版物の編集作業の援用を指向した教職員データベースシステム(EDB; Education and research database)を構築した．EDBは当初，徳島大学工学部においてのみ運用されていたが，大学評価や自己点検評価の資料を含む多くの出版物編集に利用された．その実績を受け，現在では全学レベルの運用に引き上げられている．本稿では，このEDBのコンセプトや提供される機能について述べ，入力から出版までの流れ，既出版物の概要，今後の展望について解説する．また，運用までの経緯や問題点について述べる．","ja":"大学機関では，紀要や各種総覧，シラバスなどの定期刊行物や，大学評価，外部評価，自己点検評価など，多くの報告書が編集され出版されている．これら出版物を制作するためのデータは，例えば学歴，職歴のように職員個人にとっては不変の情報であったり，著作リストのように既存のデータを追加するだけで済む情報である．しかし，個人のデータの記録書式や，編集者のデータ収集方法を統一することは困難であり，よって，出版物ごとにデータの再入力が強いられ，結果，編集・校正に長い期間を要し，データ入力者のみならず編集者にとっても多大な負担となる．そこで本学では，上記出版物の網羅すべき項目を洗いだし，「情報の再利用」を設計思想として，ユーザの入力と出版物の編集作業の援用を指向した教職員データベースシステム(EDB; Education and research database)を構築した．EDBは当初，徳島大学工学部においてのみ運用されていたが，大学評価や自己点検評価の資料を含む多くの出版物編集に利用された．その実績を受け，現在では全学レベルの運用に引き上げられている．本稿では，このEDBのコンセプトや提供される機能について述べ，入力から出版までの流れ，既出版物の概要，今後の展望について解説する．また，運用までの経緯や問題点について述べる．"},"publication_date":"2003-09","publication_name":{"en":"The Journal of University Evaluation of National Institution for Academic Degrees and University Evaluation, Research in University Evaluation","ja":"大学評価·学位授与機構研究紀要"},"volume":"Vol.3","starting_page":"31","ending_page":"50","languages":["jpn"],"referee":true,"identifiers":{"issn":["1347-5991"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:61, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797828"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/10010454276/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1390282679587897600/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=26322","label":"url"}],"paper_title":{"en":"Implementation and Analysis of a Simple Circuit Causing Border-Collision Bifurcation","ja":"Border-collision 分岐を呈する簡素な回路の実現と解析"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Abe Minoru"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"安倍 稔"}]},"description":{"en":"ecently, a new type of bifurcation phenomena called Border-Collision (abbr. BC) bifurcation has been discovered for one or two-dimensional one-parameter families of discrete-time systems. A skewed tent map is the simplest model exhibiting the BC bifurcation and the existence of break point (undifferentiable point) in the map is an essential for BC bifurcation. In some continuous systems, BC bifurcation is also confirmed. In particular, many interesting bifurcation phenomena including BC bifurcation are observed in the power electronic systems. Since power electronic circuits with current or voltage feedback have wide industrial ap plications, indeed, theoretical and experimental analysis in such systems are very important in practical point of view. In this paper, we propose a system interrupted by own state and a periodic interval, and show that the system has much variety of bifurcation phenomena, including BC bifurcation. To analyze properties of the dynamics, we derive a one-dimensional map explicitly. We show some theorem and the regions of periodic solution within two parameter space. Some of theoretical results are verified by laboratory experiments.","ja":"本論文では,一 般的 なハイブリッドシステムの解析 に向けた第一歩 として(14), リター ンマ ップが 直接skew tent mapの 形 状 とな り,パ ラ メータの変化によ りBC分 岐によるカオスを呈する最 も簡 素な電気回路 を提案 し,周 期解の性質を解析する．まず状 態がキャパシタ電圧のみで記述 され, RC回 路の抵抗 をス イッチで切 り替える発振器を提案する．このスイッチに状 態依存型断続特性,さ らにクロックパルスによる時刻依存 型断続特性をも持 たせ ることにより周期解 を発生 させ,ま たリターンマ ップ上に折点を作 り,不 変空間内に折 り畳み, 引き延ば し過程を作 ることも可能 となる． ここで時刻依存 型断続特性は,ス イッチの切り替え条件として反映させる ため微分方程式には陽に現れない．本回路は簡単な1次 元 力学系で記述されるため,厳 密解を用いて1次 元リターン マップを導出す ることは容易である． また, BC分 岐の条 件を厳密に導出し, 2次 分岐図として示す．"},"publication_date":"2002-11-01","publication_name":{"en":"IEEJ Transactions on Electronics, Information and Systems","ja":"電気学会論文誌C (電子，情報，システム部門誌)"},"volume":"Vol.122-C","number":"No.11","starting_page":"1908","ending_page":"1916","referee":true,"identifiers":{"issn":["0385-4221"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:62, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797829"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/10009587916/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1390001204609985536/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=26320","label":"url"}],"paper_title":{"en":"Bifurcation of Burst Response in Amari-Hopfield Neuron Pair with a Periodic External Force","ja":"周期外力を付加した Amari-Hopfield ニューロン対におけるバースト応答の分岐"},"authors":{"en":[{"name":"Tsuji Shigeki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"辻 繁樹"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"合原 一幸"}]},"description":{"en":"本論文では一般的な解析によく用いられている Amari-Hopfield 型ニューロンモデルについて，バースト応答の分類と対応を調べ，バースト発生機構を構築している．入力は周期外力とし，これがパラメータ分岐図における各種分岐曲線をまたがって摂動する場合，さまざまなバーストが発生する．周期外力をパラメータとし，その振幅と周波数による分岐図を求めた．バースト発振の発生·消滅·バーストのパルス数は主に接線分岐により増減することを示した．分岐のパターンによって，バースト発振を分類した．これにより，バースト応答の設計が可能となり，仕様を満たすバースト応答を自由に実現できる．","ja":"本論文では一般的な解析によく用いられている Amari-Hopfield 型ニューロンモデルについて，バースト応答の分類と対応を調べ，バースト発生機構を構築している．入力は周期外力とし，これがパラメータ分岐図における各種分岐曲線をまたがって摂動する場合，さまざまなバーストが発生する．周期外力をパラメータとし，その振幅と周波数による分岐図を求めた．バースト発振の発生·消滅·バーストのパルス数は主に接線分岐により増減することを示した．分岐のパターンによって，バースト発振を分類した．これにより，バースト応答の設計が可能となり，仕様を満たすバースト応答を自由に実現できる．"},"publication_date":"2002-09-01","publication_name":{"en":"IEEJ Transactions on Electronics, Information and Systems","ja":"電気学会論文誌C (電子，情報，システム部門誌)"},"volume":"Vol.122-C","number":"No.9","starting_page":"1506","ending_page":"1514","referee":true,"identifiers":{"issn":["0385-4221"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:63, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112109","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=24054","label":"url"}],"paper_title":{"en":"Controlling chaos in a state-dependent nonlinear system","ja":"Controlling chaos in a state-dependent nonlinear system"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"In this paper, we propose a general method for controlling chaos in a nonlinear dynamical system containing a state-dependent switch. The pole assignment for the corresponding discrete system derived from such a nonsmooth system via Poincar e mapping works effectively. As an illustrative example, we consider controlling the chaos in the Rayleigh-type oscillator with a state-dependent switch, which is changed by the hysteresis comparator. The unstable one- and two-periodic orbits in the chaotic attractor are stabilized in both numerical and experimental simulations.","ja":"状態に依存し切り替わるスイッチを有する非線形力学系に関するカオス制御の一般的手法について提案する．ポアンカレ写像を巧妙に定義すれば，それから導かれる離散写像やそのヤコビは適切に評価でき，制御系設計に活かされる．例としてレイリータイプ発振器に状態依存型スイッチが組込まれた系について，そのカオス中に含まれる不安定周期軌道を安定化する．"},"publication_date":"2002-05-01","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.12","number":"No.5","starting_page":"1111","ending_page":"1119","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1142/S0218127402004942"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:64, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=20623","label":"url"}],"paper_title":{"en":"Chaos and Control of Periodically Switched Nonlinear Systems","ja":"Chaos and Control of Periodically Switched Nonlinear Systems"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"This paper discusses chaos and its control in periodically switched nonlinear systems. Since the trajectory of the system is not differentiable at break points, the Poincar sections should be naturally attached at these points and then the Poincar mapping is derived as a composite of local mappings defined among these sections. This map enable us to calculate the location and its stabilities of the periodic points in the chaotic attractor. We also consider chaos control problem based on the Poincar map. The controlled system is fully described as the differentiable map, there fore the controller can be designed by using conventional pole assignment technique. As an illustrated example, we consider a Rayleigh type oscillator containing a periodic switch. We firstly discuss bifurcation sets of the system. The dynamic properties of periodic or bits and chaotic attractors e clarified. We also investigate bifurcation structure of phase locked regions along a Neimark-Sacker bifurcation set. Some theoretical results are con firmed by laboratory experiments. Secondly we try to stabilize one and two-period unstable periodic orbits by using the proposed method. The controller is calculated easily because all information can be obtained from the Poincar map. The results of numerical simulations are demonstrated.","ja":"本論文では周期スイッチを有する非線形系におけるカオスとその制御について議論している．そのような系では，軌道がブレークポイントで微分が不可能となり，従来の手法をそのまま適用はできない そこでポアンカレ写像をそのブレークポイントに取付け，周期解に対応する固定点方程式を可微分になるよう構成した．これにより各種局所分岐が計算できる．系にカオスが生じる場合，それに埋め込まれた不安定周期軌道を安定化する制御手法を検討した．"},"publication_date":"2001-07-01","publication_name":{"en":"The Latin American Applied Research Journal","ja":"The Latin American Applied Research Journal"},"volume":"Vol.1","number":"No.31","starting_page":"211","ending_page":"218","languages":["eng"],"referee":true,"published_paper_type":"scientific_journal"},"priority":"input_data"} line:65, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=20622","label":"url"}],"paper_title":{"en":"Controlling bifurcations of discrete maps","ja":"Controlling bifurcations of discrete maps"},"authors":{"en":[{"name":"Yap, C. Keng"},{"name":"Chen, Guanrong"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Yap, C. Keng"},{"name":"Chen, Guanrong"},{"name":"上田 哲史"}]},"description":{"en":"Bifurcation control has attracted increasing attention in recent years. A simple and unfied state-feedback methodology is developed in this paper for various bifurcation controls for discrete-time systems. The control task can be either shifting an existing bifurcation or creating a new one, for transcritical, pitchfork, saddle-node, and period- doubling bifurcations. Some computer simulations are included to illustrate the methodology and verify the theoretical results.","ja":"離散写像における分岐制御の手法を提案する．ピッチフォーク分岐，接線分岐，周期倍分岐などの分岐現象を生成する制御タスクについて述べ，理論を裏付ける数値シミュレーションについて示す．"},"publication_date":"2001-07-01","publication_name":{"en":"The Latin American Applied Research Journal","ja":"The Latin American Applied Research Journal"},"volume":"Vol.1","number":"No.31","starting_page":"157","ending_page":"162","languages":["eng"],"referee":true,"published_paper_type":"scientific_journal"},"priority":"input_data"} line:66, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797830"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=19819","label":"url"}],"paper_title":{"en":"Visualization of Bifurcation Surfaces of Periodic Solutions in Nonlinear Dynamical Systems","ja":"非線形力学系にみられる周期解の分岐曲面の視覚化"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Izumida, Eiji"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"泉田 英嗣"},{"name":"川上 博"}]},"description":{"en":"本論文では， n次元非線形常微分方程式系に含まれる3次元パラメータ空間において， 周期解に関する分岐集合(分岐曲面)を計算し， CG として視覚化する方法について述べる． 分岐曲面は一種の等値面とみなせるが，一般の等値面構成 問題とは異なり，数値積分とn+3 次元方程式の求解を要し， ボクセル判定法は計算コストの観点から用いることができない． そこで，計算コストの削減を念頭においた分岐曲面の構成方法を二つ 提案する． 構成方法 I は，第 3 パラメータのさまざまな値で 第 1, 2 パラメータに よる平面で分岐集合をもとめ，それらを接続してポリゴンを生成する 手法である．また，構成方法IIは，初期値となるパラメータ平面の 分岐集合から自律的に 3次元分岐曲面を探索してゆく手法である． 両手法の詳細を述べ，特徴を比較した． これらの可視化手法よって，パラメータ空間中における各種解の存在 領域の形状，その発生消滅，カオスの存在位置などの 大域的性質が理解でき，系の設計，解析の手助けとなる．","ja":"本論文では， n次元非線形常微分方程式系に含まれる3次元パラメータ空間において， 周期解に関する分岐集合(分岐曲面)を計算し， CG として視覚化する方法について述べる． 分岐曲面は一種の等値面とみなせるが，一般の等値面構成 問題とは異なり，数値積分とn+3 次元方程式の求解を要し， ボクセル判定法は計算コストの観点から用いることができない． そこで，計算コストの削減を念頭においた分岐曲面の構成方法を二つ 提案する． 構成方法 I は，第 3 パラメータのさまざまな値で 第 1, 2 パラメータに よる平面で分岐集合をもとめ，それらを接続してポリゴンを生成する 手法である．また，構成方法IIは，初期値となるパラメータ平面の 分岐集合から自律的に 3次元分岐曲面を探索してゆく手法である． 両手法の詳細を述べ，特徴を比較した． これらの可視化手法よって，パラメータ空間中における各種解の存在 領域の形状，その発生消滅，カオスの存在位置などの 大域的性質が理解でき，系の設計，解析の手助けとなる．"},"publication_date":"2001-04-01","publication_name":{"en":"Transactions of the Visualization Society of Japan","ja":"可視化情報学会論文集"},"volume":"Vol.21","number":"No.4","starting_page":"65","ending_page":"70","referee":true,"identifiers":{"doi":["10.3154/tvsj.21.65"],"issn":["1346-5260"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:67, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797831"},"force":{"see_also":[{"@id":"https://ci.nii.ac.jp/naid/110003313599/","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110721","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1050564287419583872/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=14462","label":"url"}],"paper_title":{"en":"A Method to Calculate Neimark-Sacker Bifurcation in Autonomous Systems","ja":"高次元自律系におけるNeimark-Sacker分岐の一計算法"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Yoshinaga Tetsuya"},{"name":"Kawakami Hiroshi"},{"name":"Chen, Guanrong"}],"ja":[{"name":"上田 哲史"},{"name":"吉永 哲哉"},{"name":"川上 博"},{"name":"陳 関栄"}]},"description":{"en":"自律系にみられるリミットサイクルにおいて， パラメータの変化により特性乗数が複素単位円を横切る場合， Neimark-Sacker 分岐を生じる．本論文ではこの分岐パラメータ値を 求める新しい計算方法を提案する． 固定点条件，ポアンカレ 断面条件に加えて， 共役複素数の特性乗数を代入した特性方程式を 実部と虚部に分離し，それぞれを独立した条件として採用する． これら条件式を連立させ，ニュートン法により解く． 新たな独立変数として，共役複素な特性乗数の偏角を用いた． ニュートン法のヤコビ行列の各要素は，複素数演算， 数値微分を用いることなく，変分方程式の解と行列操作によって 求めることができるため，ニュートン法の収束性もよい． 例として8次元自律系のリミットサイクルのNeimark-Sacker分岐の 計算結果を挙げる．","ja":"自律系にみられるリミットサイクルにおいて， パラメータの変化により特性乗数が複素単位円を横切る場合， Neimark-Sacker 分岐を生じる．本論文ではこの分岐パラメータ値を 求める新しい計算方法を提案する． 固定点条件，ポアンカレ 断面条件に加えて， 共役複素数の特性乗数を代入した特性方程式を 実部と虚部に分離し，それぞれを独立した条件として採用する． これら条件式を連立させ，ニュートン法により解く． 新たな独立変数として，共役複素な特性乗数の偏角を用いた． ニュートン法のヤコビ行列の各要素は，複素数演算， 数値微分を用いることなく，変分方程式の解と行列操作によって 求めることができるため，ニュートン法の収束性もよい． 例として8次元自律系のリミットサイクルのNeimark-Sacker分岐の 計算結果を挙げる．"},"publication_date":"2000-10-01","publication_name":{"en":"The Transactions of the Institute of Electronics, Information and Communication Engineers A","ja":"電子情報通信学会論文誌(A)"},"volume":"Vol.J83-A","number":"No.10","starting_page":"1141","ending_page":"1147","referee":true,"identifiers":{"issn":["0913-5707"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:68, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112046","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-0034238522&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=14460","label":"url"}],"paper_title":{"en":"Bifurcation Analysis of Chen's Equation","ja":"Bifurcation Analysis of Chen's Equation"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Chen, Guangrong"}],"ja":[{"name":"上田 哲史"},{"name":"Chen, Guangrong"}]},"description":{"en":"Anticontrol of chaos by making a nonchaotic system chaotic has led to the discovery of some new chaotic systems, particularly the continuous-time three-dimensional autonomous Chen's equation with only two quadratic terms. This paper further investigates some basic dynamical properties and various bifurcations of Chen's equation, thereby revealing its different features from some other chaotic models such as its origin, the Lorenz system.","ja":"非カオス的な力学系に不安定化制御を適用する研究のなかで，新たなカオス力学系が発見された．このチェン方程式と呼ばれる三次元自律系について，平衡点や周期解の分岐について詳細に解析を行った．チェン方程式とローレンツ方程式と定性的に比較し，位相的差異について議論する．"},"publication_date":"2000-08-01","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.10","number":"No.8","starting_page":"1917","ending_page":"1931","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1142/S0218127400001183"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:69, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=14459","label":"url"}],"paper_title":{"en":"Bifurcation of Switched Nonlinear Dynamical Systems","ja":"Bifurcation of Switched Nonlinear Dynamical Systems"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"This paper proposes a method to trace bifurcation sets for a piecewise-defined differential equation. In this system, the trajectory is continuous, but it is not differentiable at break points of the characteristics. We define the Poincare mapping by suitable local sections and local mappings, and thereby it is possible to calculate bifurcation parameter values. As an illustrated example, we analyze the behavior of a two-dimensional nonlinear autonomous system whose state space is constrained on two half planes concerned with state dependent switching characteristics. From investigation of bifurcation diagrams, we conclude that the tangent and global bifurcations play an important role for generating various periodic solutions and chaos. Some theoretical results are confirmed by laboratory experiments","ja":"状態の条件によってスイッチが動作し，従う力学系が切り替えられる機構をもつハイブリッドシステムの分岐問題の計算一般理論を記述している．本論文では，スイッチが切り替わるタイミングでポアンカレ写像を定義し，その時点における軌道の変分量を数値積分し，その値を写像によって誘導される差分方程式系のヤコビ行列とすることを提案し，さらに固定点·周期点，および分岐パラメータの計算アルゴリズムを述べている．従来取扱いが困難であった軌道の不可微分点の扱いが可能となり，数値的に厳密な計算が実現される．例題としてある自律系ハイブリッドシステムを取り上げ，分岐集合の計算や，カオスとの関連を述べている．本論文は IEEE/ISCAS 会議にて投稿を推薦されたものである．"},"publication_date":"1999-07-01","publication_name":{"en":"IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing","ja":"IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing"},"volume":"Vol.CAS-2","number":"No.7","starting_page":"878","ending_page":"885","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1109/82.775383"],"issn":["1057-7130"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:70, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797832"},"force":{"see_also":[{"@id":"https://ci.nii.ac.jp/naid/110003312672/","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110720","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=14457","label":"url"}],"paper_title":{"en":"Bifurcation of Nonlinear Circuits with Periodically Operating Switch","ja":"周期開閉スイッチをもつ非線形回路における分岐"},"authors":{"en":[{"name":"Kosaka, Takuji"},{"name":"Umakoshi, Yutaka"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"馬越 豊"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"本論文では，レイリー型の発振器部分とスイッチで制御される直流電源部分から構成される Alpazur 発振器の分岐集合を数値計算により求めた．従来法による分岐パラメータの計算方法では，スイッチの断続条件が軌道の連続微分性を失わせていしまい，そのままの適用はできない．そこでスイッチング動作の周期性を利用して，たくみにポアンカレ写像を構成し，分岐パラメータを計算することに成功した．定式化とアルゴリズムについて述べる．さらには Neimark-Sacker 分岐に沿って生じる位相同期解とカオスについて詳細に解析した．","ja":"本論文では，レイリー型の発振器部分とスイッチで制御される直流電源部分から構成される Alpazur 発振器の分岐集合を数値計算により求めた．従来法による分岐パラメータの計算方法では，スイッチの断続条件が軌道の連続微分性を失わせていしまい，そのままの適用はできない．そこでスイッチング動作の周期性を利用して，たくみにポアンカレ写像を構成し，分岐パラメータを計算することに成功した．定式化とアルゴリズムについて述べる．さらには Neimark-Sacker 分岐に沿って生じる位相同期解とカオスについて詳細に解析した．"},"publication_date":"1998-05-01","publication_name":{"en":"The Transactions of the Institute of Electronics, Information and Communication Engineers A","ja":"電子情報通信学会論文誌(A)"},"volume":"Vol.J81-A","number":"No.5","starting_page":"836","ending_page":"843","referee":true,"identifiers":{"issn":["0913-5707"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:71, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110701","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=13002","label":"url"}],"paper_title":{"en":"Synchronization of Electric Fireflies by using Square Wave Generators","ja":"Synchronization of Electric Fireflies by using Square Wave Generators"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"In this article, we propose a square wave generator whose switching threshold values are switched by external inputs. This circuit is designed to simulate the synchronized luminescence of coupled fireflies. We investigate the behavior of the solutions in two coupled oscillators. The dynamics are demonstrated by a linear autonomous equation piecewisely, therefore, a one-dimensional return map is derived. We also prove the existence of stable in-phase synchronization in the coupled oscillator by using the return map, and we show the existence of regions of periodic solutions within a parameter space. Some theoretical results are confirmed by laboratory measurements.","ja":"方形波発振を行うマルチバイブレータを，フォトカップラとフォトダイオードによって結合した場合に生じる同期現象について議論する．このモデルは，水を半分入れたペットボトルをパイプでつないだシステムを模擬している．初期値とパラメータによって準周期を基本とした周期解の同期が豊富に生じる．本論文ではモデル方程式の分岐解析を行い，これらパラメータ平面における同期化領域を詳細に調べた．系は区分線形系であり，分岐条件は適切なポアンカレ写像を設けることにより厳密に解析が行えた．"},"publication_date":"1998-04-01","publication_name":{"en":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences","ja":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences"},"volume":"Vol.E81-A","number":"No.5","starting_page":"656","ending_page":"663","languages":["eng"],"referee":true,"identifiers":{"issn":["0916-8508"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:72, {"insert":{"user_id":"1000039004","type":"published_papers","id":"27600891"},"force":{"see_also":[{"@id":"https://ci.nii.ac.jp/naid/110002381708","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=22069","label":"url"}],"paper_title":{"en":"Nonlinear Phenomena in Overhead-Crane-Type One-Link Manipulator","ja":"速度制御された繰り返し運動を行なう天井走行型1リンクマニピュレータにみられる非線形現象"},"authors":{"en":[{"name":"Tanaka Yoshio"},{"name":"Kawakami Hiroshi"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"田中 芳夫"},{"name":"川上 博"},{"name":"上田 哲史"}]},"description":{"en":"The dynamics of an overhead-crane-type one-link manipulator with a passive joint is essentially described by nonlinear ordinary differential equations including trigonometric functions. Under certain conditions, therefore, it is predicted that a manipulator performing repetitive tasks will exhibit typical nonlinear phenomena, such as the coexistence of several periodic vibrations and chaotic states of vibrations. In this paper, periodic motions of the manipulator are studied numerically, and their bifurcation diagrams in several parameter planes are calculated using the algorithms based on the geometric approach of ordinary differential equations. Period-doubling bifurcation leading to chaotic motions are observed in some parameter areas.","ja":"非駆動関節を有する1リンクマニピュレータについて，台車の加速度の繰り返し入力を様々に変化させることによって生じる非線形現象について報告している．定性的数値解法による2-パラメータ分岐図を詳細にもとめ，アトラクタの引力圏図の計算とともに，解の分岐によるシステムの変化と現象を定性的に解析した．シリンダー相平面においてモジュロとなる運動について，分岐現象を全て説明することができた．実際に実験装置も試作し，計算機シミュレーションとの結果の整合性についても議論している．"},"publication_date":"1997-07-01","publication_name":{"en":"Transactions of The Japan Society of Mechanical Engineers, Series C","ja":"日本機械学会論文集(C編)"},"volume":"Vol.63","number":"No.7","starting_page":"2360","ending_page":"2367","referee":true,"identifiers":{"issn":["0387-5024"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:73, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110695","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=72635","label":"url"}],"paper_title":{"en":"Bifurcation phenomena in the Josephson junction circuit coupled by a resistor","ja":"Bifurcation phenomena in the Josephson junction circuit coupled by a resistor"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"Bifurcation phenomena observed in a circuit containing two Josephson junctions coupled by a resistor are investigated. This circuit model has a mechanical analogue; Two damped pendular linked by a clutch exchanging kinetic energy of each pendulum. In this paper, firstly we study equilibria of the system. Bifurcations and topological properties of the equilibria are clarified. Secondly we analyse periodic solutions in the system by using suitable Poincare mapping and obtain a bifurcation diagram. There are two types of limit cycles distinguished by whether the motion is in S1 * R3 or T2 * R2, since at most two cyclic coordinates are included in the state space. There is a typical structure of tangent bifurcation for 2-periodic solutions with a cusp point. We found chaotic orbits via the period-doubling cascade, and a long-period stepwise orbit.","ja":"抵抗で結合されるジョセフソン接合素子の数理モデルについて検討した．状態に関する正弦関数で記述されるこのモデルは，そのモジュロや対象性を大きく反映した特異な応答を示す．本論文ではこの系にみられる分岐現象およびカオスについて議論する．モデルの力学的アナログである，クラッチで接続される2つの振り子モデルを考えた場合，合理的な結果を示していることがわかった．クラッチの摩擦係数と入力とのパラメータ平面における分岐集合を求め，クラッチを介して伝達する2つめの振り子へのエネルギーの変化によって，解の位相的分類が行えることを示す．"},"publication_date":"1996-10","publication_name":{"en":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences","ja":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences"},"volume":"Vol.E79-A","number":"No.10","starting_page":"1546","ending_page":"1550","languages":["eng"],"referee":true,"identifiers":{"issn":["0916-8508"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:74, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797833"},"force":{"see_also":[{"@id":"https://ci.nii.ac.jp/naid/110003312493","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110719","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=72634","label":"url"}],"paper_title":{"en":"A Method to Generatr a Chaotic Attractor by Destabilization","ja":"不安定化制御によるカオスの一生成法"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"本論文では， 自律系にみられる安定平衡点やリミットサイクルに対し， 不安定化制御を行う． これは，線形制御理論の極配置法において，不安定極を指定する ことによって達成され，結果としてカオスアトラクタを得ることができる． 安定平衡点の場合は，安定平衡点周りの特性方程式の 極を不安定に指定した制御器を取り付け， 制御を印加する時間を適当に与える． また，リミットサイクルに対しては，ポアンカレ写像を定義し， それによって得られる差分方程式系の固定点を不安定化し, カオスを発生させる． これらの手法の適用例として， 勾配系回路, van der Pol方程式，拡張BVP発振器のモデルに それぞれ不安定化制御を施し，得られたカオスについて検討した．","ja":"本論文では， 自律系にみられる安定平衡点やリミットサイクルに対し， 不安定化制御を行う． これは，線形制御理論の極配置法において，不安定極を指定する ことによって達成され，結果としてカオスアトラクタを得ることができる． 安定平衡点の場合は，安定平衡点周りの特性方程式の 極を不安定に指定した制御器を取り付け， 制御を印加する時間を適当に与える． また，リミットサイクルに対しては，ポアンカレ写像を定義し， それによって得られる差分方程式系の固定点を不安定化し, カオスを発生させる． これらの手法の適用例として， 勾配系回路, van der Pol方程式，拡張BVP発振器のモデルに それぞれ不安定化制御を施し，得られたカオスについて検討した．"},"publication_date":"1996-08","publication_name":{"en":"The Transactions of the Institute of Electronics, Information and Communication Engineers A","ja":"電子情報通信学会論文誌(A)"},"volume":"Vol.J79-A","number":"No.8","starting_page":"1418","ending_page":"1426","languages":["jpn"],"referee":true,"identifiers":{"issn":["0913-5707"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:75, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110694","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=25558","label":"url"}],"paper_title":{"en":"A Study of the Pendulum Equation with a Periodic Impulsive Force --- Bifurcation and Control","ja":"A Study of the Pendulum Equation with a Periodic Impulsive Force --- Bifurcation and Control"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Morita Ikuro"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"},{"name":"森田 郁朗"}]},"description":{"en":"The pendulum equation with a periodic impulsive force is investigated. This model described by a second order differential equation is also derived from dynamics of the stepping motor. In this paper, firstly, we analyze bifurcation phenomena of periodic solutions observed in a generalized pendulum equation with a periodic impulsive force. There exist two topologically different kinds of solution which can be chaotic by changing system parameters. We try to stabilize an unstable periodic orbit embedded in the chaotic attractor by small perturbations for the parameters. Secondly, we investigate the intermittent drive characteristics of two-phase hybrid stepping motor. We suggest that the unstable operations called pull-out are caused by bifurcations. Finally, we proposed a control method to avoid the pull-out by changing the repetitive frequency and stepping rate.","ja":"ステッピングモータはスピンドルの一回転に多くのステップがあり，対称性と断続特性を用いて原点周りのシリンダー相平面に運動を集約することができる．本論文では，このステッピングモータ集約モデルにおいて，外力に対する応答について，その周期解の分岐現象を解析した．ステッピングモータの脱調は，この相平面における周期解の周期倍分岐連鎖後のカオスであることを示す．そして同時にカオス状態において埋め込まれている不安定周期軌道を線形制御理論を用いて安定化を図った．"},"publication_date":"1995-10-01","publication_name":{"en":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences","ja":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences"},"volume":"Vol.E78-A","number":"No.10","starting_page":"1269","ending_page":"1275","languages":["eng"],"referee":true,"identifiers":{"issn":["0916-8508"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:76, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=123583","label":"url"}],"paper_title":{"en":"A Robotic Truck Crane with Vibration Sensors","ja":"A Robotic Truck Crane with Vibration Sensors"},"authors":{"en":[{"name":"Tanaka Yoshio"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Sumitomo Takashi"}],"ja":[{"name":"田中 芳夫"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"Sumitomo Takashi"}]},"description":{"en":"To solve the problems of the shortage and increasing age of skilled operators in Japan, we propose a new concept of \"robotic crane system\" or \"intelligent crane system\" and develop the prototype system under laboratory conditions. This paper describes the hardware of the robotic crane system, control design of the flexible rotary crane using vibration sensors, and the first experimental results. In order to simulate the crane's load swing efficiently and develop a 3-D simulator for cranes with a spherical pendulum such as a rotary crane, an efficient dynamic simulation method is also presented. This method was applied to the prototype system.","ja":"熟練者の高齢化によるクレーン操作に関する諸問題に対し，われわれはロボティクスに基づくトラッククレーン，知的クレーンを提案し，プロトタイプを制作した．本論文ではそのハードウェア概要とその実験結果について報告する．吊り荷揺れの抑制には揺れセンサを用いたフィードバック制御を行う．また，3Dシミュレータを開発した．クレーンに対応する力学系の動力学問題を解き，表示する手法について述べる．"},"publication_date":"1995-07","publication_name":{"en":"Journal of Robotics and Mechatronics","ja":"Journal of Robotics and Mechatronics"},"volume":"Vol.7","number":"No.3","starting_page":"213","ending_page":"217","languages":["eng"],"referee":true,"published_paper_type":"scientific_journal"},"priority":"input_data"} line:77, {"insert":{"user_id":"1000039004","type":"published_papers","id":"27600894"},"force":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110693","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=72632","label":"url"}],"paper_title":{"en":"Composite dynamical system for controlling chaos","ja":"Composite dynamical system for controlling chaos"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"We propose a stabilization method of unstable periodic orbits embedded in a chaotic attractor of continuous-time system by using discrete state feedback controller. The controller is designed systematically by the Poincare mapping and its derivatives. Although the output of the controller is applied periodically to system parameter as small perturbations discontinuously, the controlled orbit accomplishes C^0. As the stability of a specific orbit is completely determined by the design of controller, we can also use the method to destabilize a stable periodic orbit. The destabilization method may be effectively applied to . escape from a local minimum in various optimization problems. As an example of the stabilization and destabilization, some numerical results of Duffing's equation are illustrated.","ja":"常微分方程式で記述されるシステムがカオス応答している場合に， 状態フィードバックによる制御器を構成し， カオスの中に埋め込まれた不安定固定点，周期点(ターゲット)を安定化する手法に ついて述べる．制御対象の連続時関系について，ポアンカレ写像を通して差分力学系を導出し，その上での制御系を構成，設計した制御量を再び連続力学系に還元する「合成力学系」として新たな枠組みを提案する． また，逆に安定なターゲットの不安定化を試みた．これによりlocal minimum に 解が落ち込むことを回避することができる． 不安定化制御器を含んだシステムは，ターゲット 付近で周期解やカオス応答を発生させたり，もしくは別の安定な固定点や周期点に 収束させることができる． 具体的な例として，Duffing方程式に上述の制御を応用した結果を示した．"},"publication_date":"1995-06","publication_name":{"en":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences","ja":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences"},"volume":"Vol.E78-A","number":"No.6","starting_page":"708","ending_page":"714","languages":["eng"],"referee":true,"identifiers":{"issn":["0916-8508"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:78, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110689","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=72631","label":"url"}],"paper_title":{"en":"Bifurcation of an inductively coupled Josephson junction circuit","ja":"Bifurcation of an inductively coupled Josephson junction circuit"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"Some qualitative properties of an inductively coupled circuit containing two Josephson junction elements with a dc source are investigated. The system is described by a four-dimensional autonomous differential equation. However, the phase space can be regarded as S^1×R^3 because the system has a periodicity for the invariant transformation. In this paper, we study the properties of periodic solutions winding around S^1 as a bifurcation problem. Firstly, we analyze equilibria in this system. The bifurcation diagram of equilibria and its topological classification are given. Secondly, the bifurcation diagram of the periodic solutions winding around S^1 are calculated by using a suitable Poincare mapping, and some properties of periodic solutions are discussed. From these analyses, we clarify that a periodic solution so-called \"caterpillar solution\" [1] is observed when the two Josephson junction circuits are weakly coupled.","ja":"2つのジョセフソン接合素子の等価回路を抵抗結合し，直流電源を 接続した回路における分岐現象について検討した． おのおのの等価回路は，摩擦のある振り子と等価であり，抵抗結合によって， 個々の系の角速度の情報がお互いに影響を及ぼすようになる． そのこの系はトーラス空間上の運動となる． 力学的には，入力トルクにより振り子1を駆動し，そのエネルギーの一部を クラッチによって振り子2に伝達しているシステムとなっている． この報告では，結合係数と入力をパラメータに取り，平衡点についての 定性的性質を考察し，さらに周期解の分岐について述べる．M. Levi が発見しているうなり振動モードについて，その分岐と発生メカニズムを解析し，このモードは，周期解の周期倍分岐による二周期解であること，およびそのパラメータ平面における存在領域を示した．"},"publication_date":"1994-11","publication_name":{"en":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences","ja":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences"},"volume":"Vol.E77-A","number":"No.11","starting_page":"1758","ending_page":"1763","languages":["eng"],"referee":true,"identifiers":{"issn":["0916-8508"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:79, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=72630","label":"url"}],"paper_title":{"en":"Bifurcation of heteroclinic orbits in a circuit containing a Josephson junction element","ja":"Bifurcation of heteroclinic orbits in a circuit containing a Josephson junction element"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"The circuit equation of the circuit containing a Josephson junction and the equation of motion of a pendulum in which an elastic restoring force is applied in the direction of rotation are described in terms of a second-order ordinary differential equation containing the sum of a trigonometric term on the state and a linear term. In such a dynamic system, the number of saddles and sinks changes according to the parameter values and no periodicity exists with respect to the location of the saddles and sinks, thus analysis is difficult. In this paper, a circuit containing a Josephson junction is chosen as an example of such a dynamic system. Classification by the tangent bifurcation of the saddles and sinks and the results of the analysis based on the heteroclinic orbits on the phase plane are presented. The heteroclinic orbit presents a global bifurcation on the phase plane due to its structural instability. The parameters generated by this orbit are used as the values for the bifurcation, and the bifurcation set was derived on the parameter plane. As a result, the unique linking number is defined for a particular parameter region surrounded by the bifurcation curve. This value can be used as a guideline for rotation of the orbit on the phase plane. Further, by combining it with the bifurcation ensemble, a classification of the stable sinks in the basin is made possible.","ja":"The circuit equation of the circuit containing a Josephson junction and the equation of motion of a pendulum in which an elastic restoring force is applied in the direction of rotation are described in terms of a second-order ordinary differential equation containing the sum of a trigonometric term on the state and a linear term. In such a dynamic system, the number of saddles and sinks changes according to the parameter values and no periodicity exists with respect to the location of the saddles and sinks, thus analysis is difficult. In this paper, a circuit containing a Josephson junction is chosen as an example of such a dynamic system. Classification by the tangent bifurcation of the saddles and sinks and the results of the analysis based on the heteroclinic orbits on the phase plane are presented. The heteroclinic orbit presents a global bifurcation on the phase plane due to its structural instability. The parameters generated by this orbit are used as the values for the bifurcation, and the bifurcation set was derived on the parameter plane. As a result, the unique linking number is defined for a particular parameter region surrounded by the bifurcation curve. This value can be used as a guideline for rotation of the orbit on the phase plane. Further, by combining it with the bifurcation ensemble, a classification of the stable sinks in the basin is made possible."},"publication_date":"1994-02","publication_name":{"en":"Electronics and Communications in Japan, Part 3 : Fundamental Electronic Science","ja":"Electronics and Communications in Japan, Part 3 : Fundamental Electronic Science"},"volume":"Vol.77","number":"No.2","starting_page":"85","ending_page":"93","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1002/ecjc.4430770209"],"issn":["1520-6440"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:80, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797834"},"force":{"see_also":[{"@id":"https://ci.nii.ac.jp/naid/110003312969","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110718","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=72626","label":"url"}],"paper_title":{"en":"Bifurcation of Heteroclinic Orbits in a Circuit Containing a Josephson Junction Element","ja":"ジョセフソン接合素子を含む回路に生じるヘテロクリニック軌道の分岐"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"ジョセフソン接合素子を含む回路の回路方程式や，回転方向に 弾性復元力の働く振り子の運動方程式などは， 状態に関する三角関数の項と線形項の和を含んだ2階の常微分方程式 で記述される．このような力学系は， 平衡点の数がパラメータの値によって変わり， 平衡点の位置に関して周期性を持たなくなるため解析が難しい． 本論文では，この力学系の例としてジョセフソン接合素子を含む回路を取り上げ， 平衡点の接線分岐による分類，および 相平面上に生じるヘテロクリニック軌道に着目した解析の結果を述べる． ヘテロクリニック軌道は，その構造不安定性により，相平面上での 大域的な分岐を表す．この軌道の生じるパラメータを 分岐の値として，パラメータ平面で分岐集合を求めた． その際，分岐曲線によって囲まれる1つのパラメータ領域に， 唯一決まるまつわり数を定義した．これは，軌道の相平面での回転の指標として 用いることができ，さらに分岐集合と組み合わせることによって， 安定平衡点の引力圏の分類を可能にした．","ja":"ジョセフソン接合素子を含む回路の回路方程式や，回転方向に 弾性復元力の働く振り子の運動方程式などは， 状態に関する三角関数の項と線形項の和を含んだ2階の常微分方程式 で記述される．このような力学系は， 平衡点の数がパラメータの値によって変わり， 平衡点の位置に関して周期性を持たなくなるため解析が難しい． 本論文では，この力学系の例としてジョセフソン接合素子を含む回路を取り上げ， 平衡点の接線分岐による分類，および 相平面上に生じるヘテロクリニック軌道に着目した解析の結果を述べる． ヘテロクリニック軌道は，その構造不安定性により，相平面上での 大域的な分岐を表す．この軌道の生じるパラメータを 分岐の値として，パラメータ平面で分岐集合を求めた． その際，分岐曲線によって囲まれる1つのパラメータ領域に， 唯一決まるまつわり数を定義した．これは，軌道の相平面での回転の指標として 用いることができ，さらに分岐集合と組み合わせることによって， 安定平衡点の引力圏の分類を可能にした．"},"publication_date":"1993-10-01","publication_name":{"en":"The Transactions of the Institute of Electronics, Information and Communication Engineers A","ja":"電子情報通信学会論文誌(A)"},"volume":"Vol.J76-A","number":"No.10","starting_page":"1450","ending_page":"1456","referee":true,"identifiers":{"issn":["0913-5707"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:81, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=72628","label":"url"}],"paper_title":{"en":"Vibration suppressing control of flexible rotary crane using tip position sensor","ja":"Vibration suppressing control of flexible rotary crane using tip position sensor"},"authors":{"en":[{"name":"Tanaka Yoshio"},{"name":"Yoshida, Yasuo"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"田中 芳夫"},{"name":"Yoshida, Yasuo"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"For vibration suppressing control of flexible rotary cranes, two control methods by the use of a tip position sensor have been proposed. One is a control system that suppresses transient vibrations generated by the impact of switching of driving speeds when Bang-Bang control, open-loop anti-swing control, is completed. The other is a servo system to which vibration suppressing feedback is added. Experiments have confirmed that either system is remarkably effective in suppressing vibration.","ja":"柔軟なブームをもつ旋回クレーンについて，その吊り荷揺れメカニズムのモデリングと制御を検討した．チップ位置センサを用いてブームの揺れを計測し，PID制御を施す．実際に実機を試作し，精密にモデルのパラメータを導出した．センサにはレーザコリメータとカメラを用い，データ処理および制御量の決定はパーソナルコンピュータを用いている．計算機シミュレーションと実機による計測により，提案手法の有効性を示している．"},"publication_date":"1993-06","publication_name":{"en":"Journal of Robotics and Mechatronics","ja":"Journal of Robotics and Mechatronics"},"volume":"Vol.4","number":"No.6","starting_page":"520","ending_page":"525","languages":["eng"],"referee":true,"published_paper_type":"scientific_journal"},"priority":"input_data"} line:82, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://ci.nii.ac.jp/naid/130004083096","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=72627","label":"url"}],"paper_title":{"en":"Efficient Dynamic Simulation Method of Cranes with a Spherical Pendulum","ja":"球面振子を有するクレーンのシミュレーション法"},"authors":{"en":[{"name":"Tanaka Yoshio"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"田中 芳夫"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"旋回型クレーンにおいて，クレーン本体と吊り荷を一つの開ループリンク機構としてモデリングを行うことを提案している．受動関節と仮想リンクという新しい概念を導入し，従来使用されている開ループリンク機構ロボット用に開発された高速シミュレーション方法が適用可能となった．本文ではリンクの構成問題の詳述と，適用例，それらの数値計算結果を示している．適用例では，実験用に製作したクレーンの実パラメータを用いてシミュレーションを行い，実機とシミュレーションとの差違についても検討している．また，結果の3次元ソリッドモデルによるグラフィクス表示も試みている．","ja":"旋回型クレーンにおいて，クレーン本体と吊り荷を一つの開ループリンク機構としてモデリングを行うことを提案している．受動関節と仮想リンクという新しい概念を導入し，従来使用されている開ループリンク機構ロボット用に開発された高速シミュレーション方法が適用可能となった．本文ではリンクの構成問題の詳述と，適用例，それらの数値計算結果を示している．適用例では，実験用に製作したクレーンの実パラメータを用いてシミュレーションを行い，実機とシミュレーションとの差違についても検討している．また，結果の3次元ソリッドモデルによるグラフィクス表示も試みている．"},"publication_date":"1993-03-01","publication_name":{"en":"Transactions of The Japan Society of Mechanical Engineers, Series C","ja":"日本機械学会論文集(C編)"},"volume":"Vol.59","number":"No.3","starting_page":"186","ending_page":"190","referee":true,"identifiers":{"issn":["0387-5024"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:83, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797835"},"force":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/113256","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1050845763146058880/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=350168","label":"url"}],"paper_title":{"en":"Challenges and Improvements in a Workshop-Type Class in BYOD","ja":"BYOD環境によるワークショップ型実習の課題と改善"},"authors":{"en":[{"name":"Tanioka Hiroki"},{"name":"Matsuura Kenji"},{"name":"Ueta Tetsushi"},{"name":"Kawano Fumiaki"}],"ja":[{"name":"谷岡 広樹"},{"name":"松浦 健二"},{"name":"上田 哲史"},{"name":"河野 文昭"}]},"publication_date":"2019-03","publication_name":{"en":"Journal of University Education Research","ja":"大学教育研究ジャーナル"},"number":"No.16","starting_page":"18","ending_page":"23","languages":["jpn"],"identifiers":{"issn":["1881-1256"]},"published_paper_type":"research_institution"},"priority":"input_data"} line:84, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797836"},"force":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110950","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1050564287419657984/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=322819","label":"url"}],"paper_title":{"en":"A Consideration of an ICT Tool for Chalk and Talk Lectures","ja":"黒板に代わるICTツールの一考察"},"authors":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"description":{"en":"Many teachers notice that it is important to represent abstract images, development of equations, and summaries on a blackboard in lectures for promotion of students' understanding. On the other hand, visual aids are also effective since figures and pictures encourage intuitive comprehension. We report new possibilities and problems with this tool through experience of operations in several lectures including remote lectures and massive classrooms","ja":"学生の数理的思考を促し，演繹・帰納を通じて一定の技術を体得させるには，板書に併せた講 述が効果的と考えられる．一方でプロジェクタなどの視覚装置を用いて画像・図面などを提示する教 育効果も極めて大きい．本稿ではこれらの折衷案として，ICT ツールを用いて手書きと視聴覚コンテ ンツ両方の提示を実現する，安価な一つの方法を提案する．遠隔講義や大人数講義での実使用を通し て明らかになってきた可能性と問題点について述べる．"},"publication_date":"2017-03","publication_name":{"en":"Journal of University Education Research","ja":"大学教育研究ジャーナル"},"number":"No.14","starting_page":"62","ending_page":"68","languages":["jpn"],"identifiers":{"issn":["1881-1256"]},"published_paper_type":"research_institution"},"priority":"input_data"} line:85, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797837"},"force":{"see_also":[{"@id":"http://www.cue.tokushima-u.ac.jp/fd/pdf/journal2008teshigawara2.pdf","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/82681","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1050282812440492032/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=174281","label":"url"}],"paper_title":{"en":"Improving the Quality of a Graduate-Level Content Course Taught in English --- A Description of Student Support and Questionnaire Survey Results","ja":"英語による大学院レベル工学系授業の質向上をめざして --- 授業受講支援の実施状況とアンケート調査結果"},"authors":{"en":[{"name":"Teshigawara Mihoko"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"勅使河原 三保子"},{"name":"上田 哲史"}]},"description":{"en":"英語による大学院レベルの専門授業 において行った，受講生に対する支援講義の内容 を記述し，アンケート調査により得られた支援講 義に対する評価をまとめた．","ja":"英語による大学院レベルの専門授業 において行った，受講生に対する支援講義の内容 を記述し，アンケート調査により得られた支援講 義に対する評価をまとめた．"},"publication_date":"2008-03","publication_name":{"en":"Journal of University Education Research","ja":"大学教育研究ジャーナル"},"number":"No.5","starting_page":"123","ending_page":"127","languages":["jpn"],"identifiers":{"issn":["1881-1256"]},"published_paper_type":"research_institution"},"priority":"input_data"} line:86, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://onlinelibrary.wiley.com/doi/abs/10.1002/tee.22665","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/111611","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=334586","label":"url"}],"paper_title":{"en":"A Questionnaire System with An Authentication Framework Considering Online Activities of Users","ja":"A Questionnaire System with An Authentication Framework Considering Online Activities of Users"},"authors":{"en":[{"name":"Seki Yosuke"},{"name":"Matsuura Kenji"},{"name":"Sano Masahiko"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"関 陽介"},{"name":"松浦 健二"},{"name":"佐野 雅彦"},{"name":"上田 哲史"}]},"description":{"en":"It is difficult to distribute online questionnaire adequately to those subjects who satisfy requirements of investigations. In addition, low questionnaire response rates, because of factors such as overlooking request emails and noncooperation to answer the questionnaires, sometimes annoy the investigators. Now that today's organizational systems adopt a unified authentication framework of which logging function stores authentication records of users in federated systems, the possible solution for these problems arises by utilizing the log data and adding the questionnaire process to the framework. The present paper proposes a flow controlling mechanism arranged in a major unified authentication framework and describes how to utilize log data on the framework to select target persons for questionnaires and increase the response rates.","ja":"学内の各種アンケートはアンケート対象者へ適切に依頼することが困難である．加えて，依頼メールの見落とし，アンケートに答えない，などの要因でアンケート回収率は低くなり，依頼者を困らせる．昨今組織で運用される情報システムでは，連携するシステムにユーザの認証情報を格納する統一認証フレームワークを採用している．そこで，このログデータを活用し，アンケートシステムを認証プロセス内に紛れ込ませることにより，アンケートの回収率を向上させる機構を提案する． 主要認証フレームワークにフロー制御機構を採り入れ，ログデータよりアンケート対象者を選択させる．"},"publication_date":"2018-06","publication_name":{"en":"IEEJ Transactions on Electrical and Electronic Engineering (TEEE)","ja":"IEEJ Transactions on Electrical and Electronic Engineering (TEEE)"},"volume":"Vol.13","number":"No.7","starting_page":"1071","ending_page":"1072","languages":["eng"],"identifiers":{"doi":["10.1002/tee.22665"],"issn":["1931-4981"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:87, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797838"},"force":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/111602","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=322314","label":"url"}],"paper_title":{"en":"A Method of Providing PC Operations for Stimulating Recalls of Past Operating Process and Results","ja":"作業過程・成果の想起を促す作業履歴の提示方法"},"authors":{"en":[{"name":"Seki Yosuke"},{"name":"Matsuura Kenji"},{"name":"Sano Masahiko"},{"name":"Ueta Tetsushi"},{"name":"Tatei, Hiroaki"}],"ja":[{"name":"関 陽介"},{"name":"松浦 健二"},{"name":"佐野 雅彦"},{"name":"上田 哲史"},{"name":"立井 宏明"}]},"description":{"en":"Web検索やファイル編集作業に対して，統合的に作業記録する常駐のツールと，後日それを活用して過去作業の関連作業を支援するビューワを提案する．過去に実施・経験した知的作業を想起することで，現在の作業効率が高まることや相対的な成果物の充実などが期待される．","ja":"Web検索やファイル編集作業に対して，統合的に作業記録する常駐のツールと，後日それを活用して過去作業の関連作業を支援するビューワを提案する．過去に実施・経験した知的作業を想起することで，現在の作業効率が高まることや相対的な成果物の充実などが期待される．"},"publication_date":"2016-12","publication_name":{"en":"Japan Journal of Educational Technology","ja":"日本教育工学会論文誌"},"volume":"Vol.40","number":"No.Suppl.","starting_page":"113","ending_page":"116","languages":["jpn"],"identifiers":{"doi":["10.15077/jjet.S40065"],"issn":["1349-8290"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:88, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110707","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=309483","label":"url"}],"paper_title":{"en":"Steady state analysis of the TCP network with RED algorithm","ja":"Steady state analysis of the TCP network with RED algorithm"},"authors":{"en":[{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"description":{"en":"The transmission control protocol with a random early detection (TCP/RED) is an important algorithm for a TCP congestion control. It has been expressed as a simple second-order discrete-time hybrid dynamical model, and shows unique and typical nonlinear phenomena, e.g., bifurcation phenomena or chaotic attractors. However, detailed behavior is unclear due to discontinuity that describes the switching of transmission phases in TCP/RED, but we have proposed its analysis method in previous study. This letter clarifies bifurcation structures with it.","ja":"TCP通信におけるREDは重要な技術である．そのダイナミクスは簡素な2次元離散ハイブリッドシステムで表わされ，分岐現象やカオスなど，典型的な非線形現象を呈する．しかし，TCP/RED の送信フェーズにおけるスイッチングを決める不連続性により，詳細な振る舞いはまだ明確にされていない．前報にて解析方法を提案したので，本論文では分岐構造を明らかにする．"},"publication_date":"2016-06-01","publication_name":{"en":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences","ja":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences"},"volume":"Vol.EA99","number":"No.6","starting_page":"1247","ending_page":"1250","languages":["eng"],"identifiers":{"doi":["10.1587/transfun.E99.A.1247"],"issn":["0916-8508"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:89, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=294419","label":"url"}],"paper_title":{"en":"Bifurcations and Phase Differences of Nonlinear Coupled Dictyostelium Systems","ja":"Bifurcations and Phase Differences of Nonlinear Coupled Dictyostelium Systems"},"authors":{"en":[{"name":"Hishikawa, Kenji"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"菱川 健治"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"description":{"en":"Nagano proposed a mathematical model of coupled Dictyostelium systems and demonstrated the strong tendency of in-phase synchronization. In this study, we investigate the mechanisms of this phenomenon by obtaining bifurcation sets and analyzing the phase differences of responses. From the analysis results, the model has a wide parameter range giving a stable 1-periodic solution. Thus, the one-to-one synchronization is maintained regardless of changes in the environment parameters. For example, even if the frequency ratio of two oscillators is extremely unbalanced, the model with an appropriate coupling factor shows a 1-periodic solution.","ja":"Naganoらは結合粘菌発振系において強く同相同期がかかることを示唆している．本論文では，この系に対する分岐構造計算および位相差の計算によって同期現象の機序を検討する．結果として，系は広く1-周期解のパラメータレンジを持ち，パラメータ変動には大変鈍感に1対1同相同期を維持することがわかった．2つの発振器が相当アンバランスなパラメータであっても，適当な結合度合いで容易に同相同期が達成される．"},"publication_date":"2015-11","publication_name":{"en":"Journal of Signal Processing","ja":"Journal of Signal Processing"},"volume":"Vol.19","number":"No.4","starting_page":"99","ending_page":"102","languages":["eng"],"identifiers":{"doi":["10.2299/jsp.19.99"],"issn":["1342-6230"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:90, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-84928191587&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=289254","label":"url"}],"paper_title":{"en":"Computational Method of Border-collision Bifurcation Point for Piecewise Nonlinear Discrete-Time Dynamical Systems","ja":"区分非線形離散時間力学系に生じるBorder-collision 分岐の分岐パラメータ計算法"},"authors":{"en":[{"name":"Fujii, Takayuki"},{"name":"Asahara, Hiroyuki"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Kousaka Takuji"}],"ja":[{"name":"藤井 太就"},{"name":"麻原 寛之"},{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"高坂 拓司"}]},"publication_date":"2015-04","publication_name":{"en":"IEEJ Transactions on Electronics, Information and Systems","ja":"電気学会論文誌C (電子，情報，システム部門誌)"},"volume":"Vol.135","number":"No.4","starting_page":"468","ending_page":"469","languages":["jpn"],"identifiers":{"doi":["10.1541/ieejeiss.135.468"],"issn":["1348-8155"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:91, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797839"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/40015601305/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1520291855157814912/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=171020","label":"url"}],"paper_title":{"en":"Controlling Chaos in a Simple Circuit with Switching Delay","ja":"Controlling Chaos in a Simple Circuit with Switching Delay"},"authors":{"en":[{"name":"Oda, Norihide"},{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"MA YUE"}],"ja":[{"name":"Oda, Norihide"},{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"馬 躍"}]},"description":{"en":"Recently, the control of chaos in piecewise smooth systems has been attracting increasing attention. In the previous study, we proposed a method of stabilizing the unstable periodic orbit in the piecewise smooth system with an ideal switching action. In most practical cases, however, switching events do not behave ideally. In particular, switching delay, large or small, indeed exists and cannot be ignored. So far, there is little work on controlling chaos in such kinds of systems. In this paper, we proposes a method of stabilizing the unstable periodic orbit in a simple circuit with switching delay.","ja":"これまでに，理想的なスイッチ特性を持つカオス回路について，カオス制御を適用してきたが，本論文ではスイッチに動作遅れが伴う場合を検討する．われわれの新しい手法により，スイッチ動作の遅れ時間幅に関係なくカオス制御が実現される．"},"publication_date":"2007-07","publication_name":{"en":"Journal of Signal Processing","ja":"Journal of Signal Processing"},"volume":"Vol.11","number":"No.4","starting_page":"329","ending_page":"332","languages":["eng"],"identifiers":{"issn":["1342-6230"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:92, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112116","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=138537","label":"url"}],"paper_title":{"en":"Bifurcations in two-dimensional Hindmarsh-Rose type model","ja":"Bifurcations in two-dimensional Hindmarsh-Rose type model"},"authors":{"en":[{"name":"Tsuji Shigeki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Fujii, Hiroshi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"辻 繁樹"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"Fujii, Hiroshi"},{"name":"合原 一幸"}]},"description":{"en":"We analyze a two-dimensional Hindmarsh Rose type model exhibiting properties of both Class 1 and Class 2 neurons. Although the system is two-dimensional and contains only four parameters, the obtained bifurcation diagrams show that the bifurcation structure satisfies conditions for emergence of both features with constant stimuli.","ja":"クラス1およびクラス2のニューロ応答を行うHindmarsh Rose型2次元非自律系を解析した．直流バイアスを印加する環境下でありながら，4つのパラメータによりクラス1および2の特徴を示すことが出来る最も簡単な2次元系であることが示される．"},"publication_date":"2007-03","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.17","number":"No.3","starting_page":"985","ending_page":"998","languages":["eng"],"identifiers":{"doi":["10.1142/S0218127407017707"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:93, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797840"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/40007412468/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1523669554771534848/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145438","label":"url"}],"paper_title":{"en":"Switch Synchronizing Occasional Delayed Feedback Control for Piecewise Linear Systems","ja":"Switch Synchronizing Occasional Delayed Feedback Control for Piecewise Linear Systems"},"authors":{"en":[{"name":"Toyosaki, Yu"},{"name":"Ueta Tetsushi"},{"name":"Kousaka Takuji"}],"ja":[{"name":"豊崎 優"},{"name":"上田 哲史"},{"name":"高坂 拓司"}]},"description":{"en":"This paper proposes Switch Synchronizing Delayed Feedback Control(abbr. SSDFC) in the piecewise linear systems. This control method weeds out the unsuitable control input from the different piecewise continuous functions. As an illustrated example, we then apply this general methodology to a simple circuit containing state-period dependent switch. The unstable periodic orbit is stabilized effectively in the computer simulations. Finally, the performance of SSDFC is compared with Delayed Feedback Control(DFC).","ja":"カオス的断続力学系に対する，スイッチ動作を同期させた，遅れフィードバック制御方法を提案する．断続系に遅れフィードバック制御をそのまま適用させた場合に比較し，よい制御性能を得ることができている．"},"publication_date":"2006-07","publication_name":{"en":"Journal of Signal Processing","ja":"Journal of Signal Processing"},"volume":"Vol.10","number":"No.412","starting_page":"235","ending_page":"238","languages":["eng"],"identifiers":{"issn":["1342-6230"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:94, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112058","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=72633","label":"url"}],"paper_title":{"en":"Chaos in cross-coupled BVP oscillators","ja":"Chaos in cross-coupled BVP oscillators"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"In this letter, we investigate the cross-coupled BVP oscillators. A single BVP oscillator has two terminals which can extract an independent state variable, so in the preceding works, several coupling systems have been studied. Synchronization modes and chaos in these systems are classified as results of bifurcation problems. We revisit a coupled oscillator, and clarify new results which have not been reported before, i.e. stable tori and its breakdown, and chaotic motions. Also classification of synchronized periodic solutions is done by a bifurcation diagram.","ja":"交差結合されたBVP発振器を解析している．単体のBVP発振器は2つの独立変数にかかるポートを持っており，今までにも様々なBVP結合系が検討されてきている．本論文では，分岐問題を解き，同期モードをそれらの分類により説明している．さらに他の結合系に比較し，まだ報告のない応答について述べる．安定なトーラスや，その崩壊，カオスの出現などを示す．"},"publication_date":"2005-10","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.15","number":"No.10","starting_page":"3359","ending_page":"3366","languages":["eng"],"identifiers":{"doi":["10.1142/S0218127405013940"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:95, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112114","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=293287","label":"url"}],"paper_title":{"en":"Experimental Realization of Controlling Chaos in the Periodically Switched Nonlinear Circuit","ja":"Experimental Realization of Controlling Chaos in the Periodically Switched Nonlinear Circuit"},"authors":{"en":[{"name":"Kousaka Takuji"},{"name":"Yasuhara, Yoshihito"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"Yasuhara, Yoshihito"},{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"This letter presents an experimental confirmation of controlling the chaotic behavior of a target unstable periodic orbit when the periodically switched nonlinear circuit has a chaotic attractor. The pole assignment for the corresponding discrete system derived from such a nonautonomous system via Poincar´e mapping works effectively, and the control unit is easily realized by the window comparator, sample-hold circuits, and so on.","ja":"This letter presents an experimental confirmation of controlling the chaotic behavior of a target unstable periodic orbit when the periodically switched nonlinear circuit has a chaotic attractor. The pole assignment for the corresponding discrete system derived from such a nonautonomous system via Poincar´e mapping works effectively, and the control unit is easily realized by the window comparator, sample-hold circuits, and so on."},"publication_date":"2004-10-01","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.14","number":"No.10","starting_page":"3655","ending_page":"3660","languages":["eng"],"identifiers":{"doi":["10.1142/S0218127404011508"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:96, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112053","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=24053","label":"url"}],"paper_title":{"en":"Bifurcation in asymmetrically coupled BVP oscillators","ja":"Bifurcation in asymmetrically coupled BVP oscillators"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"BVP oscillator is the simplest mathematical model describing dynamical behavior of the neural activity. The large scale neural network can often be described naturally by coupled systems of BVP oscillators. However, even if two BVP oscillators are merely coupled by a linear element, the whole system exhibits a complicated behavior. In this paper, we analyze coupled BVP oscillators with asymmetrical coupling structure, with each oscillator having a different internal resistance. We present a complete four-dimensional system, which shows a rich variety of bifurcation phenomena, and strange attractors. We calculate bifurcation diagrams and confirm relaxation phenomena in the laboratory experiments. We also briefly report a conspicuous strange attractor.","ja":"BVP発振器は神経回路の動特性を模擬した最も単純な回路であり，大規模な神経回路網はBVP発振器の結合系で表現される．しかしながらたった2つのBVP発振器を，線形受動素子で結合させた場合であっても極めて複雑な応答が生じる．この論文では非対称に結合されたBVP発振器を解析するが，1つの4次元自律系と扱うべき，多様な応答が生じている．解の位相的性質は，分岐問題を解くことにより説明される．実際の回路実装における応答と，解析結果の対照についても述べる．"},"publication_date":"2003-05-01","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.13","number":"No.5","starting_page":"1319","ending_page":"1327","languages":["eng"],"identifiers":{"doi":["10.1142/S0218127403007199"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:97, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112051","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=20620","label":"url"}],"paper_title":{"en":"On Synchronization and Control of Coupled Wilson-Cowan Neural Oscillators","ja":"On Synchronization and Control of Coupled Wilson-Cowan Neural Oscillators"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Chen, Guanrong"}],"ja":[{"name":"上田 哲史"},{"name":"Chen, Guanrong"}]},"description":{"en":"This paper investigates the complex dynamics, synchronization and control of chaos in a system of strongly connected Wilson Cowan neural oscillators. Some typical synchronized periodic solutions are analyzed by using the Poincar e mapping method, for which bifurcation diagrams are obtained. It is shown that topological change of the synchronization mode is mainly caused and carried out by the Neimark Sacker bifurcation. Finally, a simple feedback control method is presented for stabilizing an in-phase synchronizing periodic solution embedded in the chaotic attractor of a higher-dimensional model of such coupled neural oscillators.","ja":"本論文では，結合強度の大きいWilson-Cowan型神経発信回路の結合系の複雑な挙動，同期やカオスの制御について検討している．結果として，当該力学系では同期モードの変化は主にNeimark-Sacker分岐によるものであることを，分岐図等をもとに示す．また，同相同期などを保持し続けるための制御則を提案し，シミュレーションにより有用性を示している．"},"publication_date":"2003-01-01","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.13","number":"No.1","starting_page":"163","ending_page":"175","languages":["eng"],"identifiers":{"doi":["10.1142/S0218127403006406"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:98, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797841"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/10009678789/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1390001205166567936/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=26321","label":"url"}],"paper_title":{"en":"Solving Abilities of Chaotic Noise and Iterative Simulated Annealing for TSP","ja":"カオスノイズと反復焼きなまし法ノイズのTSPに対する解探索能力"},"authors":{"en":[{"name":"Kawabe, Tohru"},{"name":"Ueta Tetsushi"},{"name":"Nishio Yoshifumi"}],"ja":[{"name":"河辺 徹"},{"name":"上田 哲史"},{"name":"西尾 芳文"}]},"description":{"en":"Hopfild型ニューラルネットワークを巡回セールス問題の解探索マシンとして適用した場合，系の運動は多くの場合局所解に陥ってしまう．このマシンに対し，カオスノイズを印加すると，大域的最適解を見いだせる可能性が他の文献によって示されている．本論文では，焼き鈍し技法で用いられる確率型ノイズと，決定論によるカオスノイズと性能を比較している．カオスノイズの何の性質がこれらの問題に有効であるのか，その断片が明らかにされる．","ja":"Hopfild型ニューラルネットワークを巡回セールス問題の解探索マシンとして適用した場合，系の運動は多くの場合局所解に陥ってしまう．このマシンに対し，カオスノイズを印加すると，大域的最適解を見いだせる可能性が他の文献によって示されている．本論文では，焼き鈍し技法で用いられる確率型ノイズと，決定論によるカオスノイズと性能を比較している．カオスノイズの何の性質がこれらの問題に有効であるのか，その断片が明らかにされる．"},"publication_date":"2002-09-01","publication_name":{"en":"Transactions of the Institute of Systems, Control and Information Engineers","ja":"システム制御情報学会論文誌"},"volume":"Vol.15","number":"No.9","starting_page":"510","ending_page":"512","languages":["jpn"],"identifiers":{"doi":["10.5687/iscie.15.510"],"issn":["1342-5668"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:99, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797842"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/110003313819/","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110724","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1050001337466163328/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=20619","label":"url"}],"paper_title":{"en":"Image Pattern Retrieval Method using Fractal Coding","ja":"フラクタル符号を用いた画像パターン検索の一手法"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Takeuchi, Akira"},{"name":"Terada Kenji"}],"ja":[{"name":"上田 哲史"},{"name":"武内 朗"},{"name":"寺田 賢治"}]},"description":{"en":"フラクタル符号化の原理を用いて画像中から，与えられた画像パターンと同じようなパターンを検索する手法を提案する．全ての画像には，部分的に互いに相似な場所が存在しているが，その性質を利用して圧縮する方式をフラクタル符号化と言う．本手法ではフラクタル符号化の圧縮データに含まれる画像中の相似な場所の位置関係を示すデータ群を利用して，決められた画像パターンを検索するものである．本手法により人間や複雑であいまいな形状の画像パターンを，背景などの模様に影響を受けることなく精度良く抽出することができる．","ja":"フラクタル符号化の原理を用いて画像中から，与えられた画像パターンと同じようなパターンを検索する手法を提案する．全ての画像には，部分的に互いに相似な場所が存在しているが，その性質を利用して圧縮する方式をフラクタル符号化と言う．本手法ではフラクタル符号化の圧縮データに含まれる画像中の相似な場所の位置関係を示すデータ群を利用して，決められた画像パターンを検索するものである．本手法により人間や複雑であいまいな形状の画像パターンを，背景などの模様に影響を受けることなく精度良く抽出することができる．"},"publication_date":"2002-02-01","publication_name":{"en":"The Transactions of the Institute of Electronics, Information and Communication Engineers A","ja":"電子情報通信学会論文誌(A)"},"volume":"Vol.J85-A","number":"No.2","starting_page":"253","ending_page":"257","identifiers":{"issn":["0913-5707"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:100, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797843"},"force":{"see_also":[{"@id":"https://ci.nii.ac.jp/naid/110003313662","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110723","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1050282812442873856/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=14480","label":"url"}],"paper_title":{"en":"A Calculation Method of the Fixed Point with a Specified Argument and Its Application","ja":"指定した偏角を有する固定点の計算とその応用"},"authors":{"en":[{"name":"Tsuji Shigeki"},{"name":"Ueta Tetsushi"},{"name":"Yoshinaga Tetsuya"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"辻 繁樹"},{"name":"上田 哲史"},{"name":"吉永 哲哉"},{"name":"川上 博"}]},"description":{"en":"非線形力学系において， 系に含まれるパラメータが変化し，固定点の特性乗数が複素単位円外に 出ることにより各種の局所的分岐現象を生じる． 本報告では，複素共役な特性乗数をもつ固定点に対して， 偏角を指定してその位置，動径，パラメータ値を数値計算する 方法を述べる．また，その応用として，Neimark-Sacker 分岐 パラメータ値を求める計算方法を提案する． 本稿では，連続力学系のポアンカレ写像または離散力学系を対象とし， 指定した偏角をもつ固定点(周期点)の等高線を パラメータ平面で計算する方法を提案する． 固定点条件，共役複素数の特性乗数を代入した特性方程式を 実部と虚部に分離し，それぞれを独立した条件として連立させ， ニュートン法で固定点位置，パラメータ値について解く． また，この手法の応用として，指定した偏角をもつNS分岐を求める 手法について述べる．これらのツールにより， 固定点とNS分岐，周期引き込み領域との関係を より直接的に調べることができる．","ja":"非線形力学系において， 系に含まれるパラメータが変化し，固定点の特性乗数が複素単位円外に 出ることにより各種の局所的分岐現象を生じる． 本報告では，複素共役な特性乗数をもつ固定点に対して， 偏角を指定してその位置，動径，パラメータ値を数値計算する 方法を述べる．また，その応用として，Neimark-Sacker 分岐 パラメータ値を求める計算方法を提案する． 本稿では，連続力学系のポアンカレ写像または離散力学系を対象とし， 指定した偏角をもつ固定点(周期点)の等高線を パラメータ平面で計算する方法を提案する． 固定点条件，共役複素数の特性乗数を代入した特性方程式を 実部と虚部に分離し，それぞれを独立した条件として連立させ， ニュートン法で固定点位置，パラメータ値について解く． また，この手法の応用として，指定した偏角をもつNS分岐を求める 手法について述べる．これらのツールにより， 固定点とNS分岐，周期引き込み領域との関係を より直接的に調べることができる．"},"publication_date":"2001-03-01","publication_name":{"en":"The Transactions of the Institute of Electronics, Information and Communication Engineers A","ja":"電子情報通信学会論文誌(A)"},"volume":"Vol.J84-A","number":"No.3","starting_page":"441","ending_page":"443","languages":["jpn"],"identifiers":{"issn":["0913-5707"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:101, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=17785","label":"url"}],"paper_title":{"en":"Chaos in a Simple Hybrid System and its Control","ja":"Chaos in a Simple Hybrid System and its Control"},"authors":{"en":[{"name":"Kousaka, Takuji"},{"name":"Tahara, Shoichi"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Abe, Minoru"}],"ja":[{"name":"高坂 拓司"},{"name":"Tahara, Shoichi"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"Abe, Minoru"}]},"description":{"en":"A simple hybrid system exhibiting chaos is developed and a chaos control method realised. It is shown that, since the dynamics can be expressed by a return map, the system has an observable chaos. The control method, which is based on the pole assignment technique, can stabilise any unstable periodic orbit in the chaos. The theoretical result is verified by laboratory experiments.","ja":"抵抗とキャパシタ，比較器とフリップフロップのみからなるカオス回路を提案し，解析している．一階の常微分方程式がしきい値とクロックパルスによって切り替えられるこの系は，連続状態と離散イベントから構成されるハイブリッドシステムとなっている．系の振る舞いは厳密解を用いて，skew tent map と呼ばれる区分線形写像に変換することができる．回路実験とシミュレーション結果を示した．"},"publication_date":"2001-01-01","publication_name":{"en":"Electronics Letters","ja":"Electronics Letters"},"volume":"Vol.37","number":"No.1","starting_page":"1","ending_page":"2","languages":["eng"],"identifiers":{"doi":["10.1049/el:20010033"],"issn":["0013-5194"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:102, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=14474","label":"url"}],"paper_title":{"en":"On Impulsive Control of a Periodically Forced Chaotic Pendulum System","ja":"On Impulsive Control of a Periodically Forced Chaotic Pendulum System"},"authors":{"en":[{"name":"Guan, Zhi-Hong"},{"name":"Chen, Guanrong"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Guan, Zhi-Hong"},{"name":"Chen, Guanrong"},{"name":"上田 哲史"}]},"description":{"en":"We consider impulsive control of a periodically forced pendulum system which has rich chaos and bifurcation phenomena. A new impulsive control method for chaos suppression of this pendulum system is developed. Some simple sufficient conditions for driving the chaotic state to its zero equilibrium are presented, and some criteria for eventually, exponentially asymptotical stability are established. This work provides a rigorous theoretical analysis to support some early experimental observations on controlling chaos in the periodically forced pendulum system.","ja":"周期外力を印加されたカオス的振り子は多様な分岐現象を示す．この系の平衡点に関するインパルス制御を考える．解析的に安定な制御則に関する十分条件を示し，シミュレーションを行った．制御則は指数漸近的であることが理論的に示されている．"},"publication_date":"2000-09-01","publication_name":{"en":"IEEE Transactions on Automatic Control","ja":"IEEE Transactions on Automatic Control"},"volume":"Vol.45","number":"No.9","starting_page":"1724","ending_page":"1727","languages":["eng"],"identifiers":{"doi":["10.1109/9.880633"],"issn":["0018-9286"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:103, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797844"},"force":{"see_also":[{"@id":"https://ci.nii.ac.jp/naid/110003183811","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110722","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=14468","label":"url"}],"paper_title":{"en":"Image Segmentation Using Fractal Coding with Resizable Domain Blocks","ja":"相似領域を可変としたフラクタル符号化を用いた画像領域分割"},"authors":{"en":[{"name":"Takeuchi, Akira"},{"name":"Ueta Tetsushi"},{"name":"Terada Kenji"}],"ja":[{"name":"武内 朗"},{"name":"上田 哲史"},{"name":"寺田 賢治"}]},"description":{"en":"フラクタル符号化の原理を用いて画像中の同じ性質の領域ごとに分割していく手法を提案する．全ての画像は部分的には互いに相似な場所があるが，その性質を利用した画像データ圧縮方式をフラクタル符号化と言う．本手法ではフラクタル符号化の圧縮データ中に含まれる画像中の相似な場所同士の位置関係情報を利用して，画像を領域分割していくものである．従来，フラクタル符号化では相似な部分をある一定の大きさごとで検索していたが，本手法では相似領域の大きさを変化させることで，領域分割の精度の向上を実現した．","ja":"フラクタル符号化の原理を用いて画像中の同じ性質の領域ごとに分割していく手法を提案する．全ての画像は部分的には互いに相似な場所があるが，その性質を利用した画像データ圧縮方式をフラクタル符号化と言う．本手法ではフラクタル符号化の圧縮データ中に含まれる画像中の相似な場所同士の位置関係情報を利用して，画像を領域分割していくものである．従来，フラクタル符号化では相似な部分をある一定の大きさごとで検索していたが，本手法では相似領域の大きさを変化させることで，領域分割の精度の向上を実現した．"},"publication_date":"2000-07-01","publication_name":{"en":"The Transactions of the Institute of Electronics, Information and Communication Engineers D","ja":"電子情報通信学会論文誌(D)"},"volume":"Vol.J83-D2","number":"No.7","starting_page":"1695","ending_page":"1700","languages":["jpn"],"identifiers":{"issn":["1880-4535"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:104, {"insert":{"user_id":"1000039004","type":"published_papers","id":"31797845"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=14469","label":"url"}],"paper_title":{"en":"フラクタル符号を用いた指紋による個人認識の一手法","ja":"フラクタル符号を用いた指紋による個人認識の一手法"},"authors":{"en":[{"name":"Masaki, Toshikazu"},{"name":"Ueta Tetsushi"},{"name":"Terada Kenji"}],"ja":[{"name":"正木 寿和"},{"name":"上田 哲史"},{"name":"寺田 賢治"}]},"description":{"en":"フラクタル符号化された指紋画像データを用いて，個人識別を行なう手法を提案する．指紋は完全なフラクタル図形ではないが，部分的な自己相似性を有している．フラクタル符号化は部分的自己相似性を利用して圧縮する技術であるが，本手法ではこの圧縮の原理を用いて個人固有の指紋の特徴を抽出する．すなわちフラクタル符号の部分自己相似を探索するアルゴリズムにより，データ取得の際の指紋の位置や向き，指の状態や押しつける強さの違いによって生じる画像中の指紋の大きさや太さ，かすれなどの影響を受けないように個人特徴を抽出することを実現した．","ja":"フラクタル符号化された指紋画像データを用いて，個人識別を行なう手法を提案する．指紋は完全なフラクタル図形ではないが，部分的な自己相似性を有している．フラクタル符号化は部分的自己相似性を利用して圧縮する技術であるが，本手法ではこの圧縮の原理を用いて個人固有の指紋の特徴を抽出する．すなわちフラクタル符号の部分自己相似を探索するアルゴリズムにより，データ取得の際の指紋の位置や向き，指の状態や押しつける強さの違いによって生じる画像中の指紋の大きさや太さ，かすれなどの影響を受けないように個人特徴を抽出することを実現した．"},"publication_date":"2000-02-01","publication_name":{"en":"The Journal of the Institute of Image Electronics Engineers of Japan","ja":"画像電子学会誌"},"volume":"Vol.29","number":"No.2","starting_page":"147","ending_page":"152","languages":["jpn"],"identifiers":{"issn":["0285-9831"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:105, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112049","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=14476","label":"url"}],"paper_title":{"en":"A Simple Approach to Calculation and Control of Unstable Periodic Orbits in Chaotic Piecewise Linear Systems","ja":"A Simple Approach to Calculation and Control of Unstable Periodic Orbits in Chaotic Piecewise Linear Systems"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Chen, Guanrong"},{"name":"Kawabe, Tohru"}],"ja":[{"name":"上田 哲史"},{"name":"Chen, Guanrong"},{"name":"河辺 徹"}]},"description":{"en":"This paper describes a simple method for calculating unstable periodic orbits (UPOs) and their control in piecewise-linear autonomous systems. The algorithm can be used to obtain any desired UPO embedded in a chaotic attractor, and the UPO can be stabilized by a simple state feedback control. A brief stability analysis of the controlled system is also given.","ja":"この論文は区分線形な自律系のカオス中に埋め込まれた不安定周期軌道を安定化する単純な手法を提案している．当該アルゴリズムは所望のUPOを検索することに使え，また，それらは簡素な状態フィードバックによって安定化可能である．制御系の安定性について，簡単な解析も行っている．"},"publication_date":"2000-01-01","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.11","number":"No.1","starting_page":"215","ending_page":"224","languages":["eng"],"identifiers":{"doi":["10.1142/S0218127401002092"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:106, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112044","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=14464","label":"url"}],"paper_title":{"en":"Yet Another Chaotic Attractor","ja":"Yet Another Chaotic Attractor"},"authors":{"en":[{"name":"Chen, Guanrong"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Chen, Guanrong"},{"name":"上田 哲史"}]},"description":{"en":"This Letter reports the finding of a new chaotic at tractor in a simple three-dimensional autonomous system, which resembles some familiar features from both the Lorenz and Rossler at tractors.","ja":"ローレンツ方程式の安定平衡点について不安定化制御を試みる過程で発見した自律系のカオスについて報告している．不安定な平衡点付近まで十分軌道が巻き込まれる，特徴のある形状のカオスアトラクタを示す．すでに有名なカオス力学系として知られるローレンツ方程式，レスラー方程式の双方と比較して，発見した方程式は，位相的に異なる力学系となっていることを確認した．この論文自体は以上の点についての速報であるが，出版後，他の論文から多くの引用がなされるようになった．"},"publication_date":"1999-07-01","publication_name":{"en":"International Journal of Bifurcation and Chaos","ja":"International Journal of Bifurcation and Chaos"},"volume":"Vol.9","number":"No.7","starting_page":"1465","ending_page":"1466","languages":["eng"],"identifiers":{"doi":["10.1142/S0218127499001024"],"issn":["0218-1274"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:107, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110699","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-0031220919&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=22071","label":"url"}],"paper_title":{"en":"A computation of bifurcation parameter values for limit cycles","ja":"A computation of bifurcation parameter values for limit cycles"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Tsueike, Masafumi"},{"name":"Kawakami Hiroshi"},{"name":"Yoshinaga Tetsuya"},{"name":"Katsuta, Yuji"}],"ja":[{"name":"上田 哲史"},{"name":"Tsueike, Masafumi"},{"name":"川上 博"},{"name":"吉永 哲哉"},{"name":"Katsuta, Yuji"}]},"description":{"en":"This letter describes a new computational method to obtain the bifurcation parameter value of a limit cycle in nonlinear autonomous systems. The method can calculate a parameter value at which local bifurcations; tangent, period-doubling and Neimark-Sacker bifurcations are occurred by using properties of the characteristic equation for a fixed point of the Poincare mapping. Conventionally a period of the limit cycle is not used explicitly since the Poincare mapping needs only whether the orbit reaches a cross-section or not. In our method, the period is treated as an independent variable for Newton's method, so an accurate location of the fixed point, its period and the bifurcation parameter value can be calculated simultaneously. Although the number of variables increases, the Jacobian matrix becomes simple and the recurrence procedure converges rapidly compared with conventional methods.","ja":"本論文では，非線形自律系としてモデル化された力学系について，リミットサイクルの分岐パラメータ値を計算する新たな計算アルゴリズムを提案している．リミットサイクルの周期は，パラメータ値に依存して変化する値であるため本来変数と扱うべきである．従来法ではポアンカレ写像を取るための数値積分時間を得るため，定数と扱っていた．しかし，この扱いにより，むしろ状態やパラメータに関する方程式は周期に対する依存度が高くなり，ヤコビは複雑となり，分岐パラメータ計算アルゴリズムにおいては収束性に影響を与えていた．本アルゴリズムでは周期を変数とし，方程式の独立性も高くなって，収束性能も高くなったことを示している．"},"publication_date":"1997-09-01","publication_name":{"en":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences","ja":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences"},"volume":"Vol.EA80","number":"No.9","starting_page":"1725","ending_page":"1728","languages":["eng"],"identifiers":{"issn":["0916-8508"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:108, {"insert":{"user_id":"1000039004","type":"published_papers"},"similar_merge":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/110696","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=123611","label":"url"}],"paper_title":{"en":"On Unstable Saddle-Node Connecting Orbit in a Planer Autonomous System","ja":"On Unstable Saddle-Node Connecting Orbit in a Planer Autonomous System"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"description":{"en":"We found a novel connecting orbit in the averaged Duffing-Rayleigh equation. The orbit starts from an unstable manifold of a saddle type equilibrium point and reaches to a stable manifold of a node type equilibrium. Although the connecting orbit is structurally stable in terms of the conventional definition of structural stability, it is structually unstable since a one-dimensional manifold into which the connecting orbit flows is unstable. We can consider the orbit is one of global bifurcations governing the differentiability of the closed orbit.","ja":"われわれはこれまでに報告のない新しいタイプのコネクティングオービットを，ダフィングレイリー方程式において発見した．これはサドル型平衡点の不安定多様体から，安定結節点の安定多様体をつなぐものであり，構造安定性に関する新たな議論を喚起する．この軌道を含む分岐図を精密に計算し，解の位相的性質を分類した"},"publication_date":"1996-11","publication_name":{"en":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences","ja":"IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences"},"volume":"Vol.E79-A","number":"No.11","starting_page":"1581","ending_page":"1586","languages":["eng"],"identifiers":{"issn":["0916-8508"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} ==== end registerFile(/WWW/pub2/data/ERD/person/10746/researchmap/published_papers.jsonl, _vgVF48B7kacV6CWkq82) ==== ==== begin registerFile(/WWW/pub2/data/ERD/person/10746/researchmap/misc.jsonl) ==== line:1, {"insert":{"user_id":"1000039004","type":"misc","id":"45855732"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=405613","label":"url"}],"paper_title":{"en":"Review of the analytical prediction method of surf-riding threshold in following sea, and its relation to IMO second-generation intact stability criteria","ja":"Review of the analytical prediction method of surf-riding threshold in following sea, and its relation to IMO second-generation intact stability criteria"},"authors":{"en":[{"name":"Maki, Atsuo"},{"name":"Sakai, Masahito"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Maki, Atsuo"},{"name":"Sakai, Masahito"},{"name":"上田 哲史"}]},"description":{"en":"High-speed ship operations have a significant risk of the broaching phenomenon when navigating in following/quartering seas. The occurrence of this phenomenon can result in a violent yaw motion, regardless of the steering effort. Centrifugal forces due to the yaw motion could cause large roll motion and even capsizing in some cases. A necessary condition for the occurrence of broaching is the surf-riding phenomenon. Therefore, the International Maritime Organization (IMO) has set up criteria to include theoretical formulas for estimating the occurrence of surf-riding phenomena. The theoretical equation used in the IMO Second-Generation Intact Stability criteria (SGISC) to estimate the surf-riding threshold is based on the authors' method, and in its derivation process, Melnikov's method. is utilized. This paper deals with nonlinear equations describing the surge motions of a ship. However, such equations cannot be directly solved; therefore, prior researchers and authors have proposed various approximate methods to predict the surf-riding threshold, including the methods based on Meknikov's method. In this paper, first, the authors describe the mechanism of the surfing phenomenon. Then, the authors explain in detail the derivation of the estimation methods for the surf-riding phenomenon that have been proposed by the prior researchers and the authors. Finally, the authors show the relationship between the theoretical prediction method of the surf-riding threshold based on Melnikov's method and the IMO SGISC.","ja":"High-speed ship operations have a significant risk of the broaching phenomenon when navigating in following/quartering seas. The occurrence of this phenomenon can result in a violent yaw motion, regardless of the steering effort. Centrifugal forces due to the yaw motion could cause large roll motion and even capsizing in some cases. A necessary condition for the occurrence of broaching is the surf-riding phenomenon. Therefore, the International Maritime Organization (IMO) has set up criteria to include theoretical formulas for estimating the occurrence of surf-riding phenomena. The theoretical equation used in the IMO Second-Generation Intact Stability criteria (SGISC) to estimate the surf-riding threshold is based on the authors' method, and in its derivation process, Melnikov's method. is utilized. This paper deals with nonlinear equations describing the surge motions of a ship. However, such equations cannot be directly solved; therefore, prior researchers and authors have proposed various approximate methods to predict the surf-riding threshold, including the methods based on Meknikov's method. In this paper, first, the authors describe the mechanism of the surfing phenomenon. Then, the authors explain in detail the derivation of the estimation methods for the surf-riding phenomenon that have been proposed by the prior researchers and the authors. Finally, the authors show the relationship between the theoretical prediction method of the surf-riding threshold based on Melnikov's method and the IMO SGISC."},"publication_date":"2024-07","publication_name":{"en":"Nonlinear Theory and Its Applications, IEICE","ja":"Nonlinear Theory and Its Applications, IEICE"},"volume":"Vol.15","number":"No.3","starting_page":"(in","ending_page":"press)","languages":["eng"],"identifiers":{"issn":["2185-4106"]},"misc_type":"introduction_scientific_journal"},"priority":"input_data"} line:2, {"insert":{"user_id":"1000039004","type":"misc","id":"40101003"},"force":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/117893","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=392224","label":"url"}],"paper_title":{"en":"To Tackle Bifurcation Problems with Python","ja":"Python で挑む分岐解析"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Amoh, Seiya"}],"ja":[{"name":"上田 哲史"},{"name":"天羽 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{"insert":{"user_id":"1000039004","type":"misc","id":"45512738"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=404861","label":"url"}],"paper_title":{"en":"粗悪雑誌と業績評価","ja":"粗悪雑誌と業績評価"},"authors":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"description":{"en":"本コラムでは著者の経験や主観に基づく，粗悪雑誌が選択される仕組み，粗悪雑誌を回避する方法について述べる．以下では粗悪雑誌についての定義は了解されているものと仮定した上で話を進める．研究分野によって実情と合わない点も多いかと思うが，ご容赦願いたい．","ja":"本コラムでは著者の経験や主観に基づく，粗悪雑誌が選択される仕組み，粗悪雑誌を回避する方法について述べる．以下では粗悪雑誌についての定義は了解されているものと仮定した上で話を進める．研究分野によって実情と合わない点も多いかと思うが，ご容赦願いたい．"},"publication_date":"2021-03-25","publication_name":{"en":"徳島大学機関リポジトリ","ja":"徳島大学機関リポジトリ"},"languages":["jpn"],"identifiers":{"doi":["10.15000/115857"]},"misc_type":"introduction_scientific_journal"},"priority":"input_data"} line:4, 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Likewise, the characteristics and conditions of the saddle-node bifurcation, period-doubling bifurcation, Neimark Sacker bifurcation, and pitchfork bifurcation are introduced for the fixed point. The method for computing the bifurcation points of the equilibrium point and the periodic points is also introduced, and an example of an application is presented.","ja":"In this chapter, we investigate the bifurcation phenomena observed in oscillatory circuits. The stability and bifurcation phenomena in autonomous systems are introduced by focusing on the equilibrium point and the fixed point. The characteristics and conditions of the saddlenode bifurcation, Hopf bifurcation, and pitchfork bifurcation are discussed for the equilibrium point. Likewise, the characteristics and conditions of the saddle-node bifurcation, period-doubling bifurcation, Neimark Sacker bifurcation, and pitchfork bifurcation are introduced for the fixed point. The method for computing the bifurcation points of the equilibrium point and the periodic points is also introduced, and an example of an application is presented."}},"priority":"input_data"} line:3, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797847"},"force":{"see_also":[{"@id":"https://www.crcpress.com/Handbook-of-Applications-of-Chaos-Theory/Skiadas-Skiadas/p/book/9781466590434","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=313143","label":"url"}],"book_title":{"en":"Bifurcation Analysis of a Simple 3D BVP Oscillator and Chaos Synchronization of Its Coupled Systems, Chapter 9, Handbook of Applications of Chaos Theory","ja":"Bifurcation Analysis of a Simple 3D BVP Oscillator and Chaos Synchronization of Its Coupled Systems, Chapter 9, Handbook of Applications of Chaos Theory"},"authors":{"en":[{"name":"Nishiuchi, Yusuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Nishiuchi, Yusuke"},{"name":"上田 哲史"}]},"publisher":{"en":"CRC Press","ja":"CRC Press"},"publication_date":"2016-06-14","languages":["eng"]},"priority":"input_data"} line:4, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797848"},"force":{"see_also":[{"@id":"http://link.springer.com/book/10.1007/978-4-431-55013-6","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=291514","label":"url"}],"book_title":{"en":"Parametric Control to Avoid Bifurcation Based on Maximum Local Lyapunov Exponent --- K. 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Thus the whole system consumes a certain control energy as the amount of such input values during the transition state. We propose a new control method that changing the threshold value dynamically to stabilize the chaotic orbit. No actual control input is added into the system unlike the OGY method and the delayed feedback control. When the orbit hits the threshold, the state-feedback only determines the next threshold value to convey the controlled orbit to the target unstable periodic orbit enventually. Thus the orbit starting from the current threshold value reaches the next controlled threshold value without any control energy. We obtain the variation of the threshold value from the composite Poincar´e map, and the controller is designed by the linear feedback theory with this variation. 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When the orbit hits the threshold, the state-feedback only determines the next threshold value to convey the controlled orbit to the target unstable periodic orbit enventually. Thus the orbit starting from the current threshold value reaches the next controlled threshold value without any control energy. We obtain the variation of the threshold value from the composite Poincar´e map, and the controller is designed by the linear feedback theory with this variation. We demonstrate this method in simple hybrid chaotic systems and show its control performances with evaluating basins of attraction."}},"priority":"input_data"} line:7, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797851"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=301889","label":"url"}],"book_title":{"en":"Nonlinear Maps and their Applications; Selected Contributions from the NOMA 2011 International Workshop","ja":"Nonlinear Maps and their Applications; Selected Contributions from the NOMA 2011 International Workshop"},"authors":{"en":[{"name":"Gracio Clara"},{"name":"Fournier-Prunaret Daniele"},{"name":"Ueta Tetsushi"},{"name":"Nishio Yoshifumi"}],"ja":[{"name":"Gracio Clara"},{"name":"Fournier-Prunaret Daniele"},{"name":"上田 哲史"},{"name":"西尾 芳文"}]},"publisher":{"en":"Springer","ja":"Springer"},"publication_date":"2014-03-20","languages":["eng"]},"priority":"input_data"} line:8, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797852"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=248572","label":"url"}],"book_title":{"en":"Manifolds and global bifurcations, Controlling Chaos --- 応用数理ハンドブック","ja":"多様体と大域分岐，カオス制御 --- 応用数理ハンドブック"},"authors":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"publisher":{"en":"朝倉書店","ja":"朝倉書店"},"publication_date":"2013-08","languages":["jpn"],"description":{"en":"非線形力学系の平衡点・固定点に関する多様体とそれにまつわる大域的分岐について解説している．また，カオス中の不安定周期軌道を安定化するカオス制御について基本的な技術を解説している．","ja":"非線形力学系の平衡点・固定点に関する多様体とそれにまつわる大域的分岐について解説している．また，カオス中の不安定周期軌道を安定化するカオス制御について基本的な技術を解説している．"}},"priority":"input_data"} line:9, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797853"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=249059","label":"url"}],"book_title":{"en":"BCPを支えるクラウド情報基盤 --- 静岡大学情報基盤センター2011年度の活動記録","ja":"BCPを支えるクラウド情報基盤 --- 静岡大学情報基盤センター2011年度の活動記録"},"authors":{"en":[{"name":"Inoue, Haruki"},{"name":"Hasegawa, Takahiro"},{"name":"Mizuno, Shinya"},{"name":"Ishii, Hiroyuki"},{"name":"Nagata, Masaki"},{"name":"Suzuki, Keiko"},{"name":"Sakata, Tomoyuki"},{"name":"Sugiura, Naoyo"},{"name":"Asano, Misaki"},{"name":"Seki, Mutumi"},{"name":"Ichikawa, Tetsuhiko"},{"name":"Ueta Tetsushi"},{"name":"Mihara, Yoshiki"}],"ja":[{"name":"井上 春樹"},{"name":"長谷川 孝博"},{"name":"水野 信也"},{"name":"石井 洋之"},{"name":"永田 正樹"},{"name":"鈴木 恵子"},{"name":"坂田 智之"},{"name":"杉浦 直代"},{"name":"淺野 みさき"},{"name":"関 睦実"},{"name":"市川 哲彦"},{"name":"上田 哲史"},{"name":"三原 義樹"}]},"publisher":{"en":"静岡学術出版","ja":"静岡学術出版"},"publication_date":"2012-06","languages":["jpn"]},"priority":"input_data"} line:10, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797854"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=241281","label":"url"}],"book_title":{"en":"Design of the Community Site for Supporting Multiple Motor-Skill Development","ja":"Design of the Community Site for Supporting Multiple Motor-Skill Development"},"authors":{"en":[{"name":"Matsuura Kenji"},{"name":"Gotoda Naka"},{"name":"Ueta Tetsushi"},{"name":"Yano Yoneo"}],"ja":[{"name":"松浦 健二"},{"name":"Gotoda Naka"},{"name":"上田 哲史"},{"name":"矢野 米雄"}]},"publisher":{"en":"Springer-Verlag","ja":"Springer-Verlag"},"publication_date":"2011-10","languages":["eng"]},"priority":"input_data"} line:11, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797855"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=227497","label":"url"}],"book_title":{"en":"1-1 力学系，相空間，1-2 保存系，可積分系，散逸系，2-1-3 ローレンツシステム，レスラーシステム --- 知識ベース「知識の森」1群11編 非線形問題","ja":"1-1 力学系，相空間，1-2 保存系，可積分系，散逸系，2-1-3 ローレンツシステム，レスラーシステム --- 知識ベース「知識の森」1群11編 非線形問題"},"authors":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"publisher":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"publication_date":"2010-09-16","languages":["jpn"],"description":{"en":"力学系および相空間の定義を，写像や微分方程式を基に与える．続いて力学系の構造に基づき，保存系，可積分系，散逸系について性質を述べる．また，二つのカオス的力学系について，発見の歴史的経緯，分岐構造等について解説する．","ja":"力学系および相空間の定義を，写像や微分方程式を基に与える．続いて力学系の構造に基づき，保存系，可積分系，散逸系について性質を述べる．また，二つのカオス的力学系について，発見の歴史的経緯，分岐構造等について解説する．"}},"priority":"input_data"} line:12, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797856"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=84245","label":"url"}],"book_title":{"en":"テスト問題·レポート課題作成ハンドブック --- 徳島大学FD推進ハンドブック","ja":"テスト問題·レポート課題作成ハンドブック --- 徳島大学FD推進ハンドブック"},"authors":{"en":[{"name":"Miyata Masanori"},{"name":"Tsuchiya Koichiro"},{"name":"Takeuchi Toshiki"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"宮田 政徳"},{"name":"土屋 浩一郎"},{"name":"竹内 敏己"},{"name":"上田 哲史"}]},"publisher":{"en":"Center for University Extension","ja":"大学開放実践センター"},"publication_date":"2004-01","languages":["jpn"],"description":{"en":"大学の授業で成績評価をする際のテスト問題やレポート課題を作成するためのハンドブックです．","ja":"大学の授業で成績評価をする際のテスト問題やレポート課題を作成するためのハンドブックです．"}},"priority":"input_data"} line:13, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797857"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=26326","label":"url"}],"book_title":{"en":"Calculation and Control of Unstable Periodic Orbits in Piecewise-Smooth Dynamical Systems. --- G. Chen, D. J. Hill, and X. Yu (eds), (Chaos and Bifurcation Control: Theory and Applications","ja":"Calculation and Control of Unstable Periodic Orbits in Piecewise-Smooth Dynamical Systems. --- G. Chen, D. J. Hill, and X. Yu (eds), (Chaos and Bifurcation Control: Theory and Applications"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawabe, Tohru"},{"name":"Kawakami Hiroshi"},{"name":"Chen, Guanrong"}],"ja":[{"name":"上田 哲史"},{"name":"河辺 徹"},{"name":"川上 博"},{"name":"Chen, Guanrong"}]},"publisher":{"en":"Springer-Verlag","ja":"Springer-Verlag"},"publication_date":"2003-07-01","languages":["eng"],"description":{"en":"This chapter describes a simple method for calculating unstable periodic orbits (UPOs) and their control in piecewise smooth autonomous systems. The algorithm can be used to obtain any desired UPO embedded in a chaotic attractor, and the UPO can be stabilized by a simple statefeedback control. Some illustrative examples are shown for demonstration.","ja":"This chapter describes a simple method for calculating unstable periodic orbits (UPOs) and their control in piecewise smooth autonomous systems. The algorithm can be used to obtain any desired UPO embedded in a chaotic attractor, and the UPO can be stabilized by a simple statefeedback control. Some illustrative examples are shown for demonstration."}},"priority":"input_data"} line:14, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797858"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=26324","label":"url"}],"book_title":{"en":"Numerical approaches to bifurcation analysis --- G. Chen and T. Ueta (eds), in Chaos in Circuits and Systems, Chapter 28","ja":"Numerical approaches to bifurcation analysis --- G. Chen and T. Ueta (eds), in Chaos in Circuits and Systems, Chapter 28"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"publisher":{"en":"World Scientific","ja":"World Scientific"},"publication_date":"2002-07-01","languages":["eng"],"description":{"en":"This chapter investigates direct methods for evaluating the bifurcation parameter values of periodic solutions in nonlinear systems. The method can numerically calculate parameter values with high convergence rate and accuracy, at which local bifurcations; tangent, period-doubling, Neimark-Sacker and pitchfork bifurcations are occurred. The method uses some basic properties of the characteristic equation for a fixed point of the corresponding Poincare map. The location and parameter value of the fixed point are used as independent variables in the computation that employs quadratically convergency in Newton method. In addition, in the case of Neimark-Sacker bifurcation, the argument of the complex conjugate multiplier or the other parameter is used as the independent variable. This direct method utilize accurate solution of variational equations with numerical integration, thus implementaion of algorithm becomes very simple. Some numerical examples are given.","ja":"This chapter investigates direct methods for evaluating the bifurcation parameter values of periodic solutions in nonlinear systems. The method can numerically calculate parameter values with high convergence rate and accuracy, at which local bifurcations; tangent, period-doubling, Neimark-Sacker and pitchfork bifurcations are occurred. The method uses some basic properties of the characteristic equation for a fixed point of the corresponding Poincare map. The location and parameter value of the fixed point are used as independent variables in the computation that employs quadratically convergency in Newton method. In addition, in the case of Neimark-Sacker bifurcation, the argument of the complex conjugate multiplier or the other parameter is used as the independent variable. This direct method utilize accurate solution of variational equations with numerical integration, thus implementaion of algorithm becomes very simple. Some numerical examples are given."}},"priority":"input_data"} line:15, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797859"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=26323","label":"url"}],"book_title":{"en":"Nonlinear dynamical systems with interrupted characteristics: Bifurcation and control --- G. Chen and T. Ueta (eds), in Chaos in Circuits and Systems, Chapter 19","ja":"Nonlinear dynamical systems with interrupted characteristics: Bifurcation and control --- G. Chen and T. Ueta (eds), in Chaos in Circuits and Systems, Chapter 19"},"authors":{"en":[{"name":"Kousaka, Takuji"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"川上 博"}]},"publisher":{"en":"World Scientific","ja":"World Scientific"},"publication_date":"2002-07-01","languages":["eng"],"description":{"en":"断続特性および非線形特性をもつ回路について，生じる周期解の発生，分岐について検討している．回路のクラスを周期外力を加える系，自律系に分けて分岐現象をのべ，分岐パラメータの計算方法を提案し，計算例を示している．区分非線形系の分岐問題について，その数値計算について例題を用いて説明している文献は他に例をみない．ポアンカレ写像の構成方法，不可微分点でのヤコビ行列の求積方法に新規性がある．また，断続系に特有な分岐現象についてもその数値計算方法について述べている．","ja":"断続特性および非線形特性をもつ回路について，生じる周期解の発生，分岐について検討している．回路のクラスを周期外力を加える系，自律系に分けて分岐現象をのべ，分岐パラメータの計算方法を提案し，計算例を示している．区分非線形系の分岐問題について，その数値計算について例題を用いて説明している文献は他に例をみない．ポアンカレ写像の構成方法，不可微分点でのヤコビ行列の求積方法に新規性がある．また，断続系に特有な分岐現象についてもその数値計算方法について述べている．"}},"priority":"input_data"} line:16, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797860"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=22063","label":"url"}],"book_title":{"en":"4章カオスと分岐，5章カオスとフラクタル --- カオス学入門","ja":"4章カオスと分岐，5章カオスとフラクタル --- カオス学入門"},"authors":{"en":[{"name":"合原 一幸"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"合原 一幸"},{"name":"上田 哲史"}]},"publisher":{"en":"放送大学教育振興会","ja":"放送大学教育振興会"},"publication_date":"2001-04-01","description":{"en":"非線形常微分方程式および非線形差分方程式で記述される力学系において，カオスの発生するメカニズムを分岐理論の立場から説明している．簡単な一次元差分方程式による周期点やその分岐，カオスの発生について述べ，その数理を説明している．カオスアトラクタの視覚化や分岐パラメータの数値計算方法も言及する．カオスの持つ状態空間やパラメータ空間における自己相似性やフラクタルの性質を，計算結果のグラフィクス表現とともに詳述している．この本の4，5章に掲載されている．1997年の「カオスの数理と技術」の改訂版であるが，全面的に内容を刷新し，補助的なデータを掲載している．","ja":"非線形常微分方程式および非線形差分方程式で記述される力学系において，カオスの発生するメカニズムを分岐理論の立場から説明している．簡単な一次元差分方程式による周期点やその分岐，カオスの発生について述べ，その数理を説明している．カオスアトラクタの視覚化や分岐パラメータの数値計算方法も言及する．カオスの持つ状態空間やパラメータ空間における自己相似性やフラクタルの性質を，計算結果のグラフィクス表現とともに詳述している．この本の4，5章に掲載されている．1997年の「カオスの数理と技術」の改訂版であるが，全面的に内容を刷新し，補助的なデータを掲載している．"}},"priority":"input_data"} line:17, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797861"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=13000","label":"url"}],"book_title":{"en":"Chaos and Bifurcation in Coupled Networks and Their Contol --- Controlling Chaos and Bifurcations in Engineering Systems","ja":"Chaos and Bifurcation in Coupled Networks and Their Contol --- Controlling Chaos and Bifurcations in Engineering Systems"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"Chen, Guanrong"}],"ja":[{"name":"上田 哲史"},{"name":"Chen, Guanrong"}]},"publisher":{"en":"CRC Press","ja":"CRC Press"},"publication_date":"1999-07-01","languages":["eng"],"description":{"en":"This chapter investigates the complex dynamics and control of chaos in a system of strongly connected neural oscillators. More specifically, the existence and stability of some simple equilibria of a coupled-neuron system is first discussed. The system periodic solutions are then analyzed by using the Poincare mapping method. Bifurcation diagrams and topological properties for these periodic solutions are obtained, where synchronization phenomena are classified. Finally, a simple feedback control method for stabilizing an in-phase synchronizing periodic solution embedded in the chaotic attractor of a higher-dimensional model of such coupled neural oscillators is presented.","ja":"This chapter investigates the complex dynamics and control of chaos in a system of strongly connected neural oscillators. More specifically, the existence and stability of some simple equilibria of a coupled-neuron system is first discussed. The system periodic solutions are then analyzed by using the Poincare mapping method. Bifurcation diagrams and topological properties for these periodic solutions are obtained, where synchronization phenomena are classified. Finally, a simple feedback control method for stabilizing an in-phase synchronizing periodic solution embedded in the chaotic attractor of a higher-dimensional model of such coupled neural oscillators is presented."}},"priority":"input_data"} line:18, {"insert":{"user_id":"1000039004","type":"books_etc","id":"31797862"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=22065","label":"url"}],"book_title":{"en":"4章カオスと分岐，5章カオスとフラクタル --- カオスの数理と技術","ja":"4章カオスと分岐，5章カオスとフラクタル --- カオスの数理と技術"},"authors":{"en":[{"name":"Ueta Tetsushi"},{"name":"合原 一幸"}],"ja":[{"name":"上田 哲史"},{"name":"合原 一幸"}]},"publisher":{"en":"放送大学教育振興会","ja":"放送大学教育振興会"},"publication_date":"1997-04-01","description":{"en":"非線形常微分方程式および非線形差分方程式で記述される力学系において，カオスの発生するメカニズムを分岐理論の立場から説明している．簡単な一次元差分方程式による周期点やその分岐，カオスの発生について述べ，その数理を説明している．カオスアトラクタの視覚化や分岐パラメータの数値計算方法も言及する．カオスの持つ状態空間やパラメータ空間における自己相似性やフラクタルの性質を，計算結果のグラフィクス表現とともに詳述している．この本の4，5章に掲載されている．","ja":"非線形常微分方程式および非線形差分方程式で記述される力学系において，カオスの発生するメカニズムを分岐理論の立場から説明している．簡単な一次元差分方程式による周期点やその分岐，カオスの発生について述べ，その数理を説明している．カオスアトラクタの視覚化や分岐パラメータの数値計算方法も言及する．カオスの持つ状態空間やパラメータ空間における自己相似性やフラクタルの性質を，計算結果のグラフィクス表現とともに詳述している．この本の4，5章に掲載されている．"}},"priority":"input_data"} line:19, {"insert":{"user_id":"1000039004","type":"books_etc","id":"33114312"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=12999","label":"url"}],"book_title":{"en":"C によるカオス CG","ja":"C によるカオス CG"},"authors":{"en":[{"name":"Kawakami Hiroshi"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"川上 博"},{"name":"上田 哲史"}]},"publisher":{"en":"サイエンス社","ja":"サイエンス社"},"publication_date":"1994-04-01","description":{"en":"非線形差分方程式で記述されるさまざまな力学系について，パラメータに依存して生じる固定点，周期点，カオスなどのアトラクタを視覚化する．状態空間におけるカオス軌道の表現方法，周期点アトラクタへの吸引集合の視覚化，パラメータにおける分岐集合の計算方法について述べる．C言語のソースをすべて添付し，研究入門者や初学者にも実験できるよう配慮されている．計算結果は高精度グラフィクスにより描画され，多数掲載されている．アトラクタの安定性やその解析方法，分岐パラメータの計算方法もソースコードとともに詳述し，専門家への参考図書としてもなり得る．","ja":"非線形差分方程式で記述されるさまざまな力学系について，パラメータに依存して生じる固定点，周期点，カオスなどのアトラクタを視覚化する．状態空間におけるカオス軌道の表現方法，周期点アトラクタへの吸引集合の視覚化，パラメータにおける分岐集合の計算方法について述べる．C言語のソースをすべて添付し，研究入門者や初学者にも実験できるよう配慮されている．計算結果は高精度グラフィクスにより描画され，多数掲載されている．アトラクタの安定性やその解析方法，分岐パラメータの計算方法もソースコードとともに詳述し，専門家への参考図書としてもなり得る．"}},"priority":"input_data"} ==== end registerFile(/WWW/pub2/data/ERD/person/10746/researchmap/books_etc.jsonl, DfgVF48B7kacV6CWlbD7) ==== ==== begin registerFile(/WWW/pub2/data/ERD/person/10746/researchmap/presentations.jsonl) ==== line:1, {"insert":{"user_id":"1000039004","type":"presentations","id":"43866783"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=403598","label":"url"}],"presentation_title":{"en":"Design and Development of Bifurcation Analysis Software Using Python","ja":"Design and Development of Bifurcation Analysis Software Using Python"},"presenters":{"en":[{"name":"Amoh Seiya"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"天羽 晟矢"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2023","ja":"Proc. NOLTA2023"},"publication_date":"2023-09-28","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Catania","ja":"Catania"},"description":{"en":"There are several software packages for solving bifurcation problems of nonlinear dynamical systems, but they are built on Fortran or old version of MATLAB. They often require users to prepare in advance, and their interfaces are not modern. In this paper, we present the design of a bifurcation computation package using Python. Python provides numerical calculation libraries ported from Fortran and other languages, and the trade-off between speed and readability is well balanced. The proposed package includes interactive phase-portrait drawing software, the main calculation part of the bifurcation analysis, and tools for grapher that can be used in academic papers.","ja":"There are several software packages for solving bifurcation problems of nonlinear dynamical systems, but they are built on Fortran or old version of MATLAB. They often require users to prepare in advance, and their interfaces are not modern. In this paper, we present the design of a bifurcation computation package using Python. Python provides numerical calculation libraries ported from Fortran and other languages, and the trade-off between speed and readability is well balanced. The proposed package includes interactive phase-portrait drawing software, the main calculation part of the bifurcation analysis, and tools for grapher that can be used in academic papers."},"is_international_presentation":true},"priority":"input_data"} line:2, {"insert":{"user_id":"1000039004","type":"presentations","id":"43866784"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=403596","label":"url"}],"presentation_title":{"en":"Python Expressions of Variational Equations","ja":"Python Expressions of Variational Equations"},"presenters":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2023","ja":"Proc. NOLTA2023"},"publication_date":"2023-09-28","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Catania","ja":"Catania"},"description":{"en":"Python is gaining attention as a fundamental programming language for machine learning and data science. This paper describes a detailed Python approach to nonlinear problems, especially the bifurcation problems of periodic solutions. It is a highly readable implementation of the bifurcation algorithm, independent from the computer and the operating system, and it allows an interactive trial-and-error processing.","ja":"Python is gaining attention as a fundamental programming language for machine learning and data science. This paper describes a detailed Python approach to nonlinear problems, especially the bifurcation problems of periodic solutions. It is a highly readable implementation of the bifurcation algorithm, independent from the computer and the operating system, and it allows an interactive trial-and-error processing."},"is_international_presentation":true},"priority":"input_data"} line:3, {"insert":{"user_id":"1000039004","type":"presentations","id":"43866785"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=403597","label":"url"}],"presentation_title":{"en":"Laminar stabilization control in chaos intermittency","ja":"Laminar stabilization control in chaos intermittency"},"presenters":{"en":[{"name":"Katayama, Michiru"},{"name":"Ikeda Kenji"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"片山 充二"},{"name":"池田 建司"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2023","ja":"Proc. NOLTA2023"},"publication_date":"2023-09-26","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Catania","ja":"Catania"},"description":{"en":"Intermittency gives the irregular switching of almost periodic (laminar) and chaotic (burst) motions, and can be confirmed in every physical system within a certain parameter range. In this paper, by utilizing a method stabilizing a periodic motion which have been vanished by a saddle node bifurcation, a laminar motion in the intermittency is stabilized by a tiny control input. Apseudo periodic orbit composed by the vanished orbit or laminar motion is applied as a reference for the linear feedback control. We demonstrate the control for a circuit model and show robust stabilization responses.","ja":"Intermittency gives the irregular switching of almost periodic (laminar) and chaotic (burst) motions, and can be confirmed in every physical system within a certain parameter range. In this paper, by utilizing a method stabilizing a periodic motion which have been vanished by a saddle node bifurcation, a laminar motion in the intermittency is stabilized by a tiny control input. Apseudo periodic orbit composed by the vanished orbit or laminar motion is applied as a reference for the linear feedback control. We demonstrate the control for a circuit model and show robust stabilization responses."},"is_international_presentation":true},"priority":"input_data"} line:4, {"insert":{"user_id":"1000039004","type":"presentations","id":"43866786"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=403595","label":"url"}],"presentation_title":{"en":"Multivibrator with Slow-Fast Dynamics","ja":"Multivibrator with Slow-Fast Dynamics"},"presenters":{"en":[{"name":"Amoh Seiya"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"天羽 晟矢"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2023","ja":"Proc. NOLTA2023"},"publication_date":"2023-09-26","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Catania","ja":"Catania"},"description":{"en":"In this paper, we discusses slow-fast dynamical systems, which are ordinary differential equations with very different time constants. Such systems can exhibit a canard solution, which results in explosive amplitude increases for small parameter changes. We explores the canard explosion parameters using a multivibrator circuit as a slow-fast dynamical system, and presents numerical simulation results and a real circuit realization of the canard based on the simulations. The study focuses on the transition from the periodic solution generation process by Hopf bifurcation to canard explosion.","ja":"In this paper, we discusses slow-fast dynamical systems, which are ordinary differential equations with very different time constants. Such systems can exhibit a canard solution, which results in explosive amplitude increases for small parameter changes. We explores the canard explosion parameters using a multivibrator circuit as a slow-fast dynamical system, and presents numerical simulation results and a real circuit realization of the canard based on the simulations. The study focuses on the transition from the periodic solution generation process by Hopf bifurcation to canard explosion."},"is_international_presentation":true},"priority":"input_data"} line:5, {"insert":{"user_id":"1000039004","type":"presentations","id":"42309247"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=396481","label":"url"}],"presentation_title":{"en":"Security Impact Analysis of Degree of Field Extension in Lattice Attacks on Ring-LWE Problem","ja":"Security Impact Analysis of Degree of Field Extension in Lattice Attacks on Ring-LWE Problem"},"presenters":{"en":[{"name":"Direbieski Lucas Yuri"},{"name":"Tanioka Hiroki"},{"name":"Matsuura Kenji"},{"name":"Takeuchi Hironori"},{"name":"Sano Masahiko"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"ディレビエスキー ルーカス"},{"name":"谷岡 広樹"},{"name":"松浦 健二"},{"name":"竹内 寛典"},{"name":"佐野 雅彦"},{"name":"上田 哲史"}]},"event":{"en":"COMPSAC 2023 Workshop: The 1st IEEE International Workshop on Data Science & Machine Learning for Cybersecurity, IoT & Digital Forensics (DSML)","ja":"COMPSAC 2023 Workshop: The 1st IEEE International Workshop on Data Science & Machine Learning for Cybersecurity, IoT & Digital Forensics (DSML)"},"publication_date":"2023-06-29","languages":["eng"],"promoter":{"en":"IEEE Computer Society","ja":"IEEE Computer Society"},"location":{"en":"Turin","ja":"Turin"},"description":{"en":"Modern information communications use cryptography to keep the contents of communications confidential. RSA (RivestShamirAdleman) cryptography and elliptic curve cryptography, which are public-key cryptosystems, are widely used cryptographic schemes. However, it is known that these cryptographic schemes can be deciphered in a very short time by Shors algorithm when a quantum computer is put into practical use. Therefore, several methods have been proposed for quantum computer-resistant cryptosystems that cannot be cracked even by a quantum computer. A simple implementation of LWE-based lattice cryptography based on the LWE (Learning With Errors) problem requires a key length of O(n2) to ensure the same level of security as existing public-key cryptography schemes such as RSA and elliptic curve cryptography. In this paper, we attacked the Ring-LWE (RLWE) scheme, which can be implemented with a short key length, with a modified LLL (Lenstra-Lenstra-Lova sz) basis reduction algorithm and investigated the trend in the degree of field extension required to generate a secure and small key. Results showed that the lattice-based cryptography may be strengthened by employing Cullen or Mersenne prime numbers as the degree of field extension.","ja":"Modern information communications use cryptography to keep the contents of communications confidential. RSA (RivestShamirAdleman) cryptography and elliptic curve cryptography, which are public-key cryptosystems, are widely used cryptographic schemes. However, it is known that these cryptographic schemes can be deciphered in a very short time by Shors algorithm when a quantum computer is put into practical use. Therefore, several methods have been proposed for quantum computer-resistant cryptosystems that cannot be cracked even by a quantum computer. A simple implementation of LWE-based lattice cryptography based on the LWE (Learning With Errors) problem requires a key length of O(n2) to ensure the same level of security as existing public-key cryptography schemes such as RSA and elliptic curve cryptography. In this paper, we attacked the Ring-LWE (RLWE) scheme, which can be implemented with a short key length, with a modified LLL (Lenstra-Lenstra-Lova sz) basis reduction algorithm and investigated the trend in the degree of field extension required to generate a secure and small key. Results showed that the lattice-based cryptography may be strengthened by employing Cullen or Mersenne prime numbers as the degree of field extension."},"is_international_presentation":true},"priority":"input_data"} line:6, {"insert":{"user_id":"1000039004","type":"presentations","id":"41608211"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=394304","label":"url"}],"presentation_title":{"en":"Performed-Tactics Detection of a Basketball Match using Multi-Object Tracking Technology Applicable for a Movie","ja":"Performed-Tactics Detection of a Basketball Match using Multi-Object Tracking Technology Applicable for a Movie"},"presenters":{"en":[{"name":"Matsuura Kenji"},{"name":"Jobe Kohta"},{"name":"Tanioka Hiroki"},{"name":"Takeuchi Hironori"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"松浦 健二"},{"name":"Jobe Kohta"},{"name":"谷岡 広樹"},{"name":"竹内 寛典"},{"name":"上田 哲史"}]},"event":{"en":"Elizabeth Langran (Ed.), Proceedings of Society for Information Technology & Teacher Education International Conference","ja":"Elizabeth Langran (Ed.), Proceedings of Society for Information Technology & Teacher Education International Conference"},"publication_date":"2023-03-17","languages":["eng"],"promoter":{"en":"Association for the Advancement of Computing in Education","ja":"Association for the Advancement of Computing in Education"},"location":{"en":"New Orleans, LA, US","ja":"New Orleans, LA, US"},"is_international_presentation":true},"priority":"input_data"} line:7, {"insert":{"user_id":"1000039004","type":"presentations","id":"40825260"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=393366","label":"url"}],"presentation_title":{"en":"Bifurcations in a forced Wilson-Cowan neuron pair","ja":"Bifurcations in a forced Wilson-Cowan neuron pair"},"presenters":{"en":[{"name":"Yoshikawa, Masaki"},{"name":"Ono, Kentaro"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"吉川 聖輝"},{"name":"Ono, Kentaro"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA 2022","ja":"Proc. NOLTA 2022"},"publication_date":"2022-12-12","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Online","ja":"Online"},"description":{"en":"We investigate bifurcations of periodic solutions observed in the forced Wilson-Cowan neuron pair by both the brute-force computation and the shooting method. By super-imposing results given by both methods, a detailed topological classification of periodic solutions is achieved. Totally different shapes of bifurcation sets compared with other literature are found.","ja":"We investigate bifurcations of periodic solutions observed in the forced Wilson-Cowan neuron pair by both the brute-force computation and the shooting method. By super-imposing results given by both methods, a detailed topological classification of periodic solutions is achieved. Totally different shapes of bifurcation sets compared with other literature are found."},"is_international_presentation":true},"priority":"input_data"} line:8, {"insert":{"user_id":"1000039004","type":"presentations","id":"36039439"},"force":{"see_also":[{"@id":"http://www.chaos-fractal.cn/2021/2021/index-2021.html","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=383453","label":"url"}],"presentation_title":{"en":"Locating and Controlling Chaotic Saddles","ja":"Locating and Controlling Chaotic Saddles"},"presenters":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"event":{"en":"The 14th International Workshop on Complex-Systems for Future Technologies and Applications (IWCFTA2021)","ja":"The 14th International Workshop on Complex-Systems for Future Technologies and Applications (IWCFTA2021)"},"publication_date":"2021-12-11","invited":true,"languages":["eng"],"location":{"en":"Zhanjiang (online)","ja":"Zhanjiang (online)"},"description":{"en":"Some planar discrete nonlinear systems may have a horseshoe structure with stable and unstable manifolds associated with a saddle fixed point. Under this situation, as is well known, there are infinitely many unstable periodic points around the saddle. By making correspondence of the cross sections of manifolds and symbolic dynamics, one can obtain a ``candidate area'' containing an unstable periodic point whose period is given by the gray code. These unstable periodic points can be stabilized by applying any chaos control technique into that candidate area, for which the external force control method exhibits a very robust control performance. In this talk, a horseshoe structure derived by Poincaré mapping for a two dimensional nonautonomous hybrid system is analyzed as an example. A a locating scheme for unstable periodic points is demonstrated, and their control results are presented.","ja":"Some planar discrete nonlinear systems may have a horseshoe structure with stable and unstable manifolds associated with a saddle fixed point. Under this situation, as is well known, there are infinitely many unstable periodic points around the saddle. By making correspondence of the cross sections of manifolds and symbolic dynamics, one can obtain a ``candidate area'' containing an unstable periodic point whose period is given by the gray code. These unstable periodic points can be stabilized by applying any chaos control technique into that candidate area, for which the external force control method exhibits a very robust control performance. In this talk, a horseshoe structure derived by Poincaré mapping for a two dimensional nonautonomous hybrid system is analyzed as an example. A a locating scheme for unstable periodic points is demonstrated, and their control results are presented."},"is_international_presentation":true},"priority":"input_data"} line:9, {"insert":{"user_id":"1000039004","type":"presentations","id":"33842732"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=382212","label":"url"}],"presentation_title":{"en":"Calculation method for unstable periodic points in unimodal maps using symbolic dynamical system","ja":"Calculation method for unstable periodic points in unimodal maps using symbolic dynamical system"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Miino, Yuu"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NSLW2021","ja":"Proc. NSLW2021"},"publication_date":"2021-12","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Online","ja":"Online"},"description":{"en":"We have developed a novel method to calculate unstable periodic points in unimodal maps based on symbolic dynamical system. In the numerical experiments, we have correctly discovered the points in 10^{-12} tolerance.","ja":"We have developed a novel method to calculate unstable periodic points in unimodal maps based on symbolic dynamical system. In the numerical experiments, we have correctly discovered the points in 10^{-12} tolerance."},"is_international_presentation":true},"priority":"input_data"} line:10, {"insert":{"user_id":"1000039004","type":"presentations","id":"33842733"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=382211","label":"url"}],"presentation_title":{"en":"Homoclinic bifurcation analysis for logistic map","ja":"Homoclinic bifurcation analysis for logistic map"},"presenters":{"en":[{"name":"Yuu Miino"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Yuu Miino"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NSLW2021","ja":"Proc. NSLW2021"},"publication_date":"2021-12","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Online","ja":"Online"},"description":{"en":"We have proposed the numerical method to calculate the homoclinic bifurcation parameter of the logistic map. From the experiments, we have exhibited the target parameters in the bifurcation diagram.","ja":"We have proposed the numerical method to calculate the homoclinic bifurcation parameter of the logistic map. From the experiments, we have exhibited the target parameters in the bifurcation diagram."},"is_international_presentation":true},"priority":"input_data"} line:11, {"insert":{"user_id":"1000039004","type":"presentations","id":"33842734"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=382210","label":"url"}],"presentation_title":{"en":"A Method to Obtain Variational Equations Automatically by Applying Symbolic Differentiation","ja":"A Method to Obtain Variational Equations Automatically by Applying Symbolic Differentiation"},"presenters":{"en":[{"name":"Seiya Amoh"},{"name":"Miho Ogura"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"天羽 晟矢"},{"name":"小倉 海帆"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NSLW2021","ja":"Proc. NSLW2021"},"publication_date":"2021-12","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Online","ja":"Online"},"description":{"en":"In the conventional implementations for solving bifurcation problems, Jacobian matrix and its partial derivatives regarding the given problem should be provided manually. This process is not so easy, thus it often induces human errors like computation failures, mistakes of copies, especially if the system is higher order. In this paper, we develop a preprocessor that gives the Jacobian matrix and partial derivatives symbolically by using SymPy packages on the Python platform. Possibilities about the inclusion of errors are minimized by symbolic derivations and reducing loop structures. It imposes a user only on putting an expression of the equation into a JSON fomat file. We demonstrate bifurcation calculations for discrete neuron dynamical systems. The system includes an exponential function, which makes the calculation of derivatives complicated, but we show that it can be implemented simply by using the symbolic differentiation.","ja":"In the conventional implementations for solving bifurcation problems, Jacobian matrix and its partial derivatives regarding the given problem should be provided manually. This process is not so easy, thus it often induces human errors like computation failures, mistakes of copies, especially if the system is higher order. In this paper, we develop a preprocessor that gives the Jacobian matrix and partial derivatives symbolically by using SymPy packages on the Python platform. Possibilities about the inclusion of errors are minimized by symbolic derivations and reducing loop structures. It imposes a user only on putting an expression of the equation into a JSON fomat file. We demonstrate bifurcation calculations for discrete neuron dynamical systems. The system includes an exponential function, which makes the calculation of derivatives complicated, but we show that it can be implemented simply by using the symbolic differentiation."},"is_international_presentation":true},"priority":"input_data"} line:12, {"insert":{"user_id":"1000039004","type":"presentations","id":"33842735"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=382209","label":"url"}],"presentation_title":{"en":"Backward-Time Dynamics in an RLC Circuit with an Inverted Diode","ja":"Backward-Time Dynamics in an RLC Circuit with an Inverted Diode"},"presenters":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"event":{"en":"Proc. NSLW2021","ja":"Proc. NSLW2021"},"publication_date":"2021-12","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Online","ja":"Online"},"is_international_presentation":true},"priority":"input_data"} line:13, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797873"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=374061","label":"url"}],"presentation_title":{"en":"Secret Sharing Scheme Using Chaotic Neural Network","ja":"Secret Sharing Scheme Using Chaotic Neural Network"},"presenters":{"en":[{"name":"Izumi, Shunya"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"泉 竣也"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NCSP2021","ja":"Proc. NCSP2021"},"publication_date":"2021-03-01","languages":["eng"],"promoter":{"en":"The Research Institute of Signal Processing Japan","ja":"The Research Institute of Signal Processing Japan"},"location":{"en":"Online","ja":"Online"},"description":{"en":"To avoid risks about transportation of secret keys for the chaos common-key encryption scheme, we proposed a chaos-based secret sharing scheme. However it is designed by a one-dimensional difference equation, so the threshold of the scheme has to be lowered. The risk of leaking the plaintext is higher compared to the conventional secret sharing scheme. In this paper, we will propose a secret sharing scheme using the high-dimensional chaotic neuron model. Since the config- uration of this model is chargeable, the whole dimension can be chosen. By changing the dimension, the number of shares required for decoding, that is the threshold, can be adjusted. The effect of changing the dimensionality of the model on the variance and recovery results is confirmed. The performance is evaluated by comparing with the previous study.","ja":"To avoid risks about transportation of secret keys for the chaos common-key encryption scheme, we proposed a chaos-based secret sharing scheme. However it is designed by a one-dimensional difference equation, so the threshold of the scheme has to be lowered. The risk of leaking the plaintext is higher compared to the conventional secret sharing scheme. In this paper, we will propose a secret sharing scheme using the high-dimensional chaotic neuron model. Since the config- uration of this model is chargeable, the whole dimension can be chosen. By changing the dimension, the number of shares required for decoding, that is the threshold, can be adjusted. The effect of changing the dimensionality of the model on the variance and recovery results is confirmed. The performance is evaluated by comparing with the previous study."},"is_international_presentation":true},"priority":"input_data"} line:14, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797874"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=372462","label":"url"}],"presentation_title":{"en":"Devil's staircase and multistability in a hybrid harmonic oscillator","ja":"Devil's staircase and multistability in a hybrid harmonic oscillator"},"presenters":{"en":[{"name":"Miino Yuu"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"美井野 優"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA 2020","ja":"Proc. NOLTA 2020"},"publication_date":"2020-11-19","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Online","ja":"Online"},"description":{"en":"In this study, we introduce a simple hybrid dynamical system showing complex behavior. Only hav- ing two harmonic oscillators with a stable node, this system exhibits rich kinds of nonlinear phenomena: bifurcations, chaos, multistable state, and devil's staircase. We observe them in phase portraits, bifurcation diagrams, and the ro- tation number, via the numerical experiments. Through the bifurcation analysis, we clarify the relation between the grazing bifurcation and the devil's staircase, and summa- rize the scenario to the chaos.","ja":"In this study, we introduce a simple hybrid dynamical system showing complex behavior. Only hav- ing two harmonic oscillators with a stable node, this system exhibits rich kinds of nonlinear phenomena: bifurcations, chaos, multistable state, and devil's staircase. We observe them in phase portraits, bifurcation diagrams, and the ro- tation number, via the numerical experiments. Through the bifurcation analysis, we clarify the relation between the grazing bifurcation and the devil's staircase, and summa- rize the scenario to the chaos."},"is_international_presentation":true},"priority":"input_data"} line:15, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797875"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=371648","label":"url"}],"presentation_title":{"en":"A Cryptographic Hash Function Based on a Chaotic Map","ja":"A Cryptographic Hash Function Based on a Chaotic Map"},"presenters":{"en":[{"name":"Ogura, Miho"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"小倉 海帆"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA 2020","ja":"Proc. NOLTA 2020"},"publication_date":"2020-11-16","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Online","ja":"Online"},"description":{"en":"In a chaotic system, the sensitivity of the initialvalues, and a uniform distribution of mapped points aredesirable properties for hashing. In the conventional hashfunctions based on chaotic maps, an initial key given by theparameter values or initial state is required, however, theexistence of this initial key becomes a certain vulnerability.We developed a key-less hashing function based on a tentmap iteration. The parameter values and the initial valuesare obtained by exclusive-ORing each 32-bit character with64 constants. We evaluate its security and performance bythe confusion-diffusion analysis. The results assert that theproposed function is better than SHA-256 under appropriateconditions.","ja":"In a chaotic system, the sensitivity of the initialvalues, and a uniform distribution of mapped points aredesirable properties for hashing. In the conventional hashfunctions based on chaotic maps, an initial key given by theparameter values or initial state is required, however, theexistence of this initial key becomes a certain vulnerability.We developed a key-less hashing function based on a tentmap iteration. The parameter values and the initial valuesare obtained by exclusive-ORing each 32-bit character with64 constants. We evaluate its security and performance bythe confusion-diffusion analysis. The results assert that theproposed function is better than SHA-256 under appropriateconditions."},"is_international_presentation":true},"priority":"input_data"} line:16, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797876"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=371647","label":"url"}],"presentation_title":{"en":"Bifurcation analysis of 3D hybrid autonomous system","ja":"Bifurcation analysis of 3D hybrid autonomous system"},"presenters":{"en":[{"name":"Amo, Seiya"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"天羽 晟矢"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA 2020","ja":"Proc. NOLTA 2020"},"publication_date":"2020-11-16","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Online","ja":"Online"},"description":{"en":"In this paper, an analysis method for highdimensional piece-wise nonlinear autonomous systems is proposed. The method is more accurate than the conventional methods since we newly introduce durations as independent variables. We show the explanation of this method and the bifurcation analysis results of the piece-wise linear system.","ja":"In this paper, an analysis method for highdimensional piece-wise nonlinear autonomous systems is proposed. The method is more accurate than the conventional methods since we newly introduce durations as independent variables. We show the explanation of this method and the bifurcation analysis results of the piece-wise linear system."},"is_international_presentation":true},"priority":"input_data"} line:17, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797877"},"force":{"see_also":[{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-85107198127&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=369097","label":"url"}],"presentation_title":{"en":"Quantitative Measurement and Analysis to Thinking as a Way of Programming for Elementary School in Japan","ja":"Quantitative Measurement and Analysis to Thinking as a Way of Programming for Elementary School in Japan"},"presenters":{"en":[{"name":"Yano Rina"},{"name":"Tanioka Hiroki"},{"name":"Matsuura Kenji"},{"name":"Sano Masahiko"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"矢野 里奈"},{"name":"谷岡 広樹"},{"name":"松浦 健二"},{"name":"佐野 雅彦"},{"name":"上田 哲史"}]},"event":{"en":"Proceedings of IIAI-AAI2020","ja":"Proceedings of IIAI-AAI2020"},"publication_date":"2020-09-01","languages":["eng"],"location":{"en":"Kitakyushu","ja":"Kitakyushu"},"description":{"en":"Programming education will be compulsory in elementary schools in Japan from 2020, but it is still little information on how to measure the effects of lessons conducted for students. In this study, to measure objectively and quantitativelythe educational effect of programming education, we developed a test of measuring the ability of thinking as a way of programming. In this paper, we evaluate the measurability of the test using Fishers exact test for elementary school students answers, focusing on the grade, the programming experience, and the difference between the results before and after the workshop.","ja":"Programming education will be compulsory in elementary schools in Japan from 2020, but it is still little information on how to measure the effects of lessons conducted for students. In this study, to measure objectively and quantitativelythe educational effect of programming education, we developed a test of measuring the ability of thinking as a way of programming. In this paper, we evaluate the measurability of the test using Fishers exact test for elementary school students answers, focusing on the grade, the programming experience, and the difference between the results before and after the workshop."},"is_international_presentation":true},"priority":"input_data"} line:18, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797878"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=363075","label":"url"}],"presentation_title":{"en":"A method to suppress excited states for high symmetrical DOPO networks","ja":"A method to suppress excited states for high symmetrical DOPO networks"},"presenters":{"en":[{"name":"Amo, Seiya"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"天羽 晟矢"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA 2019","ja":"Proc. NOLTA 2019"},"publication_date":"2019-12-04","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Kuala Lumpur","ja":"Kuala Lumpur"},"description":{"en":"A network coupled with degenerate optical parametric oscillator (DOPO) can be used as a coherent Ising machine (CIM). Since some classes of combinatorial optimization problems can be encoded into the network configuration of DOPOs, a very fast computation is expected. However, the CIM cannot result the optimum solutions always because of bifurcation structure of the system influenced from the symmetry of the network configuration. Especially, it is impossible to avoid trapping into local minima by controlling with a uniform pomp rate. In this paper, we propose a method to suppress local minima by adjusting a pomp rate of the specific DOPO whereas the pump rates of other DOPOs are uniformvalues. This control may break the symmetrical property and the bifurcation structure temporarily and guide the trajectory into the global minima. We show several simulation results.","ja":"A network coupled with degenerate optical parametric oscillator (DOPO) can be used as a coherent Ising machine (CIM). Since some classes of combinatorial optimization problems can be encoded into the network configuration of DOPOs, a very fast computation is expected. However, the CIM cannot result the optimum solutions always because of bifurcation structure of the system influenced from the symmetry of the network configuration. Especially, it is impossible to avoid trapping into local minima by controlling with a uniform pomp rate. In this paper, we propose a method to suppress local minima by adjusting a pomp rate of the specific DOPO whereas the pump rates of other DOPOs are uniformvalues. This control may break the symmetrical property and the bifurcation structure temporarily and guide the trajectory into the global minima. We show several simulation results."},"is_international_presentation":true},"priority":"input_data"} line:19, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797879"},"force":{"see_also":[{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-85080896317&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=360330","label":"url"}],"presentation_title":{"en":"Improving Animal Recognition Accuracy using Image De-fencing","ja":"Improving Animal Recognition Accuracy using Image De-fencing"},"presenters":{"en":[{"name":"Kawanaka Kohei"},{"name":"Rabarison Misamanana Felicia"},{"name":"Tanioka Hiroki"},{"name":"Sano Masahiko"},{"name":"Matsuura Kenji"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"川中 康平"},{"name":"ラバリソン ミサマナナ フェリシア"},{"name":"谷岡 広樹"},{"name":"佐野 雅彦"},{"name":"松浦 健二"},{"name":"上田 哲史"}]},"event":{"en":"The 7th International Conference on Smart Computing and Artificial Intelligence (SCAI 2019)","ja":"The 7th International Conference on Smart Computing and Artificial Intelligence (SCAI 2019)"},"publication_date":"2019-07-10","languages":["eng"],"promoter":{"en":"IIAI","ja":"IIAI"},"location":{"en":"Toyama","ja":"Toyama"},"description":{"en":"When a computer recognizes an animal on an image, an accuracy of animal recognition decreases if a part of the animals body is covered by fences. On the other hand, when a human recognizes an object on the image, it is known to be possible to remove the fences and supplement the removed areas, and recognize the object, even if a part of the object is covered by fences. In this research, we aim to improve the accuracy of animal recognition using de-fencing on computer.","ja":"When a computer recognizes an animal on an image, an accuracy of animal recognition decreases if a part of the animals body is covered by fences. On the other hand, when a human recognizes an object on the image, it is known to be possible to remove the fences and supplement the removed areas, and recognize the object, even if a part of the object is covered by fences. In this research, we aim to improve the accuracy of animal recognition using de-fencing on computer."},"is_international_presentation":true},"priority":"input_data"} line:20, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797880"},"force":{"see_also":[{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-85080922805&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=360329","label":"url"}],"presentation_title":{"en":"Animal Stamp Rally Application using Image Recognition","ja":"Animal Stamp Rally Application using Image Recognition"},"presenters":{"en":[{"name":"Kimura Kaoru"},{"name":"Rabarison Misamanana Felicia"},{"name":"Kohei Kawanaka"},{"name":"Tanioka Hiroki"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"木村 薫"},{"name":"ラバリソン ミサマナナ フェリシア"},{"name":"川中 康平"},{"name":"谷岡 広樹"},{"name":"上田 哲史"}]},"event":{"en":"The 7th International Conference on Smart Computing and Artificial Intelligence (SCAI 2019)","ja":"The 7th International Conference on Smart Computing and Artificial Intelligence (SCAI 2019)"},"publication_date":"2019-07-09","languages":["eng"],"promoter":{"en":"IIAI","ja":"IIAI"},"location":{"en":"Toyama","ja":"Toyama"},"description":{"en":"Tokushima zoo is a municipal zoo housing a lot ofanimals for educational purpose. Thus, Tokushima city wantsvisitors to observe animals as many as possible whilst havingfun. The animal stamp rally is a game that visitors collect aseries of stamps at around animals which visitors have observed.Not to provide real stamps, tables and stamp cards, we developan animal stamp rally application. Thanks to the ConvolutionalNeural Network (CNN), the application can recognize stampsfrom snapshots of real animals instead of real stamps or QRcodes. Additionally, to improve animal recognition accuracy, theapplication uses GPS information. In this paper, we describesa progress of our development of the animal stamp rallyapplication, and estimates its recognition accuracy.","ja":"Tokushima zoo is a municipal zoo housing a lot ofanimals for educational purpose. Thus, Tokushima city wantsvisitors to observe animals as many as possible whilst havingfun. The animal stamp rally is a game that visitors collect aseries of stamps at around animals which visitors have observed.Not to provide real stamps, tables and stamp cards, we developan animal stamp rally application. Thanks to the ConvolutionalNeural Network (CNN), the application can recognize stampsfrom snapshots of real animals instead of real stamps or QRcodes. Additionally, to improve animal recognition accuracy, theapplication uses GPS information. In this paper, we describesa progress of our development of the animal stamp rallyapplication, and estimates its recognition accuracy."},"is_international_presentation":true},"priority":"input_data"} line:21, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797881"},"force":{"see_also":[{"@id":"http://www.shipstab.org/files/Proceedings/ISSW/ISSW_2019_Helsinki_Finland/Papers/2_2_Maki_et_al_ISSW2019.pdf","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=363192","label":"url"}],"presentation_title":{"en":"A perspective on theoretical estimation of stochastic nonlinear rolling","ja":"A perspective on theoretical estimation of stochastic nonlinear rolling"},"presenters":{"en":[{"name":"Maki, Atsuo"},{"name":"Maruyama, Yuuki"},{"name":"Umeda, Naoya"},{"name":"Miino Yuu"},{"name":"Katayama, Toru"},{"name":"Sakai, Masahiro"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Maki, Atsuo"},{"name":"Maruyama, Yuuki"},{"name":"Umeda, Naoya"},{"name":"美井野 優"},{"name":"Katayama, Toru"},{"name":"Sakai, Masahiro"},{"name":"上田 哲史"}]},"event":{"en":"Proc. of 17th International Ship Stability Workshop","ja":"Proc. of 17th International Ship Stability Workshop"},"publication_date":"2019-06-10","languages":["eng"],"location":{"en":"Helsinki","ja":"Helsinki"},"description":{"en":"Development of the probabilistic assessment method for nonlinear ship motion in irregular seas is essential. Particularly, theoretical based method is useful for practical and wider application such as stability evaluation in preliminary design stage. In this research, the method in which Monte Carlo Simulation and theoretical method were combined is newly proposed. Here, from the limited number of Monte Carlo Simulation (MCS) realizations, the unknown coefficients containing in the theoretically obtained non-Gaussian probability density function (PDF) were successfully determined. In this research, the results on roll motion in beam sea condition and parametric rolling in longitudinal waves were shown. Then, it was found that this approach is capable of determining the PDF, and the tail of the obtained PDF shows good agreement with the theoretical results.","ja":"Development of the probabilistic assessment method for nonlinear ship motion in irregular seas is essential. Particularly, theoretical based method is useful for practical and wider application such as stability evaluation in preliminary design stage. In this research, the method in which Monte Carlo Simulation and theoretical method were combined is newly proposed. Here, from the limited number of Monte Carlo Simulation (MCS) realizations, the unknown coefficients containing in the theoretically obtained non-Gaussian probability density function (PDF) were successfully determined. In this research, the results on roll motion in beam sea condition and parametric rolling in longitudinal waves were shown. Then, it was found that this approach is capable of determining the PDF, and the tail of the obtained PDF shows good agreement with the theoretical results."},"is_international_presentation":true},"priority":"input_data"} line:22, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797882"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=351473","label":"url"}],"presentation_title":{"en":"Local Zoo Animal Stamp Rally Application using Image Recognition","ja":"Local Zoo Animal Stamp Rally Application using Image Recognition"},"presenters":{"en":[{"name":"Kaoru Kimura"},{"name":"Rabarison Misa Felicia"},{"name":"Kohei Kawanaka"},{"name":"Tanioka Hiroki"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"木村 薫"},{"name":"RABARISON MISAMANANA FELICIA"},{"name":"川中 康平"},{"name":"谷岡 広樹"},{"name":"上田 哲史"}]},"event":{"en":"IEEE International Conference on Computational Photography 2019","ja":"IEEE International Conference on Computational Photography 2019"},"publication_date":"2019-05-15","languages":["eng"],"promoter":{"en":"IEEE","ja":"IEEE"},"location":{"en":"Tokyo","ja":"Tokyo"},"is_international_presentation":true},"priority":"input_data"} line:23, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797883"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=351471","label":"url"}],"presentation_title":{"en":"Improving Animal Recognition Accuracy using Deep Learning","ja":"Improving Animal Recognition Accuracy using Deep Learning"},"presenters":{"en":[{"name":"Kawanaka Kohei"},{"name":"Rabarison Misa Felicia"},{"name":"Tanioka Hiroki"},{"name":"Sano Masahiko"},{"name":"Matsuura Kenji"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"川中 康平"},{"name":"RABARISON MISAMANANA FELICIA"},{"name":"谷岡 広樹"},{"name":"佐野 雅彦"},{"name":"松浦 健二"},{"name":"上田 哲史"}]},"event":{"en":"IEEE International Conference on Computational Photography 2019","ja":"IEEE International Conference on Computational Photography 2019"},"publication_date":"2019-05-15","languages":["eng"],"promoter":{"en":"IEEE","ja":"IEEE"},"location":{"en":"Tokyo","ja":"Tokyo"},"is_international_presentation":true},"priority":"input_data"} line:24, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797884"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=346376","label":"url"}],"presentation_title":{"en":"Local stability and bifurcation analysis of the softening Duffing equation by numerical computation","ja":"Local stability and bifurcation analysis of the softening Duffing equation by numerical computation"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"}],"ja":[{"name":"美井野 優"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"}]},"event":{"en":"Proc. 13th International Conference on the Stability of Ships and Ocean Vehicles","ja":"Proc. 13th International Conference on the Stability of Ships and Ocean Vehicles"},"publication_date":"2018-09-15","languages":["eng"],"location":{"en":"Osaka","ja":"Osaka"},"is_international_presentation":true},"priority":"input_data"} line:25, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797885"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=346375","label":"url"}],"presentation_title":{"en":"Bifurcations in a sinusoidally driven LCR circuit with a hysteresis","ja":"Bifurcations in a sinusoidally driven LCR circuit with a hysteresis"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"美井野 優"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Proc. NOLTA 2018","ja":"Proc. NOLTA 2018"},"publication_date":"2018-09-03","languages":["eng"],"location":{"en":"Tarragona, Spain","ja":"Tarragona, Spain"},"description":{"en":"We investigate a driven LCR circuit with ahysteresis. We describe the circuit by a hybrid dynamicalsystem. The coil is modeled by a piecewise linear hysteresis, and the changes of the condition of the coil (magnetizedor not) are described by a finite state machine. We computelocal bifurcations accurately by taking a suitable Poincaremapping. Appearance patterns of the tangent and grazingbifurcations characterize this model.","ja":"We investigate a driven LCR circuit with ahysteresis. We describe the circuit by a hybrid dynamicalsystem. The coil is modeled by a piecewise linear hysteresis, and the changes of the condition of the coil (magnetizedor not) are described by a finite state machine. We computelocal bifurcations accurately by taking a suitable Poincaremapping. Appearance patterns of the tangent and grazingbifurcations characterize this model."},"is_international_presentation":true},"priority":"input_data"} line:26, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797886"},"force":{"see_also":[{"@id":"https://csce.ucmss.com/cr/books/2018/LFS/CSREA2018/PDP8027.pdf","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=341735","label":"url"}],"presentation_title":{"en":"Evaluating Hitting Skills of NPB Players with Logistic Regression Analysis","ja":"Evaluating Hitting Skills of NPB Players with Logistic Regression Analysis"},"presenters":{"en":[{"name":"Sakai Mamoru"},{"name":"Tanioka Hiroki"},{"name":"Matsuura Kenji"},{"name":"Sano Masahiko"},{"name":"Ohira Kenji"},{"name":"Ueta Tetsushi"},{"name":"Hiroaki Sakaguchi"}],"ja":[{"name":"坂井 衛"},{"name":"谷岡 広樹"},{"name":"松浦 健二"},{"name":"佐野 雅彦"},{"name":"大平 健司"},{"name":"上田 哲史"},{"name":"坂口 裕昭"}]},"event":{"en":"CSCE'18 Proceedings","ja":"CSCE'18 Proceedings"},"publication_date":"2018-07-30","languages":["eng"],"promoter":{"en":"CSREA Press","ja":"CSREA Press"},"location":{"en":"Las Vegas","ja":"Las Vegas"},"description":{"en":"Luck or unluck is supposed to exist in baseball. In this paper, we consider unpredictable \"lucky\" or \"un-lucky\" cases which are occurred on the ground in order to find out authentic ability of batters. If all cases are observable, hit probabilities can be calculated. However, it is impossible to gather all the information on the ground. Therefore, \"luck\" is defined as influence of information that cannot be observed. To provide more appropriate evaluation for NPB 1 players, this paper proposes a predicted BABIP using Logistic Regression and describes the predicted BABIP reducing the influence of luck on the assessment of hitting ability. Analysis results show that there is a possibility of appropriate evaluation on hitting abilities of NPB players using the predicted BABIP.","ja":"Luck or unluck is supposed to exist in baseball. In this paper, we consider unpredictable \"lucky\" or \"un-lucky\" cases which are occurred on the ground in order to find out authentic ability of batters. If all cases are observable, hit probabilities can be calculated. However, it is impossible to gather all the information on the ground. Therefore, \"luck\" is defined as influence of information that cannot be observed. To provide more appropriate evaluation for NPB 1 players, this paper proposes a predicted BABIP using Logistic Regression and describes the predicted BABIP reducing the influence of luck on the assessment of hitting ability. Analysis results show that there is a possibility of appropriate evaluation on hitting abilities of NPB players using the predicted BABIP."},"is_international_presentation":true},"priority":"input_data"} line:27, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797887"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=336834","label":"url"}],"presentation_title":{"en":"An attempt to enlarge basin in discrete tomographic dynamics with a competitive term","ja":"An attempt to enlarge basin in discrete tomographic dynamics with a competitive term"},"presenters":{"en":[{"name":"Kojima Takeshi"},{"name":"Ueta Tetsushi"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"兒島 雄志"},{"name":"上田 哲史"},{"name":"吉永 哲哉"}]},"event":{"en":"Proc. of NCSP'18","ja":"Proc. of NCSP'18"},"publication_date":"2018-03-07","languages":["eng"],"promoter":{"en":"The Research Institute of Signal Processing Japan","ja":"The Research Institute of Signal Processing Japan"},"location":{"en":"Honolulu","ja":"Honolulu"},"is_international_presentation":true},"priority":"input_data"} line:28, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797888"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=335198","label":"url"}],"presentation_title":{"en":"Global bifurcation analysis in a simple piecewise linear non-autonomous dynamical system","ja":"Global bifurcation analysis in a simple piecewise linear non-autonomous dynamical system"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"美井野 優"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Proc. NOLTA 2017","ja":"Proc. NOLTA 2017"},"publication_date":"2017-12-07","languages":["eng"],"location":{"en":"Cancun, Mexico","ja":"Cancun, Mexico"},"description":{"en":"In this study, we construct a simple piecewise linear dynamical system and analyze their global bifurcation phenomena. From the parameter dependency, we derive the scenario of local and global bifurcation phenomena.","ja":"In this study, we construct a simple piecewise linear dynamical system and analyze their global bifurcation phenomena. From the parameter dependency, we derive the scenario of local and global bifurcation phenomena."},"is_international_presentation":true},"priority":"input_data"} line:29, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797889"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=326908","label":"url"}],"presentation_title":{"en":"Five-segment PWL conductance in a Josephson junction","ja":"Five-segment PWL conductance in a Josephson junction"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"美井野 優"},{"name":"上田 哲史"}]},"event":{"en":"Proc. IEEE TJCAS 2017","ja":"Proc. IEEE TJCAS 2017"},"publication_date":"2017-08-22","languages":["eng"],"location":{"en":"Okayama","ja":"Okayama"},"is_international_presentation":true},"priority":"input_data"} line:30, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797890"},"force":{"see_also":[{"@id":"https://www.computer.org/csdl/proceedings/iiai-aai/2017/0621/00/0621a997.pdf","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-85040546313&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=325475","label":"url"}],"presentation_title":{"en":"Improving Document Availability in Storage --- Where're our important documents for daily business operations?","ja":"Improving Document Availability in Storage --- Where're our important documents for daily business operations?"},"presenters":{"en":[{"name":"Tanioka Hiroki"},{"name":"Bando Takafumi"},{"name":"Matsuura Kenji"},{"name":"Ohira Kenji"},{"name":"Sano Masahiko"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"谷岡 広樹"},{"name":"板東 孝文"},{"name":"松浦 健二"},{"name":"大平 健司"},{"name":"佐野 雅彦"},{"name":"上田 哲史"}]},"event":{"en":"The 9th International Conference on E-Service and Knowledge Management (ESKM 2017)","ja":"The 9th International Conference on E-Service and Knowledge Management (ESKM 2017)"},"publication_date":"2017-07-11","languages":["eng"],"promoter":{"en":"IIAI","ja":"IIAI"},"location":{"en":"Hamamatsu","ja":"Hamamatsu"},"description":{"en":"This paper provides a case study of improving availability for searching documents in an academic facility. Every day some documents are needed for our business and academic activities in the Center for Administration of Information Tech- nology (AIT) in Tokushima University. AIT has been employing and operating Information Security Management System (ISMS) since 2014. ISMS requires to maintain Confidentiality, Integrity and Availability. Particularly, AIT places importance on Avail- ability. However, time-consuming is a problem to find documents in the daily operation. A case study was conducted to put a full-text search engine in the facility, considering the objective and efficiency about finding documents in the file-server. In the process, it was found out that document freshness is important to academic office workers for their job. Then, the effectiveness of a score of TF-IDF with document freshness was assessed. Therefore, availability for finding documents was significantly improved using a full-text search engine with document freshness.","ja":"This paper provides a case study of improving availability for searching documents in an academic facility. Every day some documents are needed for our business and academic activities in the Center for Administration of Information Tech- nology (AIT) in Tokushima University. AIT has been employing and operating Information Security Management System (ISMS) since 2014. ISMS requires to maintain Confidentiality, Integrity and Availability. Particularly, AIT places importance on Avail- ability. However, time-consuming is a problem to find documents in the daily operation. A case study was conducted to put a full-text search engine in the facility, considering the objective and efficiency about finding documents in the file-server. In the process, it was found out that document freshness is important to academic office workers for their job. Then, the effectiveness of a score of TF-IDF with document freshness was assessed. Therefore, availability for finding documents was significantly improved using a full-text search engine with document freshness."},"is_international_presentation":true},"priority":"input_data"} line:31, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797891"},"force":{"see_also":[{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-85031916565&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=325474","label":"url"}],"presentation_title":{"en":"Research on Integrated Authentication Using Passwordless Authentication Method","ja":"Research on Integrated Authentication Using Passwordless Authentication Method"},"presenters":{"en":[{"name":"Morii Michitomo"},{"name":"Tanioka Hiroki"},{"name":"Ohira Kenji"},{"name":"Sano Masahiko"},{"name":"Matsuura Kenji"},{"name":"Seki Yosuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"森井 理智"},{"name":"谷岡 広樹"},{"name":"大平 健司"},{"name":"佐野 雅彦"},{"name":"松浦 健二"},{"name":"関 陽介"},{"name":"上田 哲史"}]},"event":{"en":"COMPSAC Workshops 2017 Student Research Symposium","ja":"COMPSAC Workshops 2017 Student Research Symposium"},"publication_date":"2017-07-05","languages":["eng"],"promoter":{"en":"IEEE Computer Society","ja":"IEEE Computer Society"},"location":{"en":"Torino","ja":"Torino"},"description":{"en":"Currently, authentication methods using ID and password are widely used and fulfilled central roles in various information systems and services. Our university also uses ID and password for authentication of most services. However, passwords have various problems such as reuse, phishing and leakage. This research is a practical experiment in order to implement an integrated authentication system without password. Shibboleth is introduced to our university, providing capabilities of web single sign-on and attribute exchange framework for organizational services. The Fast IDentity Online (FIDO) is adopted into Shibboleth as an external authentication, to realize passwordless authentication. Furthermore, we held a feasibility test of an integrated authentication system without password, and considered problems of the passwordless authentication method using FIDO.","ja":"Currently, authentication methods using ID and password are widely used and fulfilled central roles in various information systems and services. Our university also uses ID and password for authentication of most services. However, passwords have various problems such as reuse, phishing and leakage. This research is a practical experiment in order to implement an integrated authentication system without password. Shibboleth is introduced to our university, providing capabilities of web single sign-on and attribute exchange framework for organizational services. The Fast IDentity Online (FIDO) is adopted into Shibboleth as an external authentication, to realize passwordless authentication. Furthermore, we held a feasibility test of an integrated authentication system without password, and considered problems of the passwordless authentication method using FIDO."},"is_international_presentation":true},"priority":"input_data"} line:32, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797892"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=322311","label":"url"}],"presentation_title":{"en":"Synchronized bifurcation in a two-coupled Izhikevich neuron model","ja":"Synchronized bifurcation in a two-coupled Izhikevich neuron model"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"美井野 優"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA 2016","ja":"Proc. NOLTA 2016"},"publication_date":"2016-11-28","languages":["eng"],"location":{"en":"Yugawara","ja":"Yugawara"},"description":{"en":"In a coupled Izhikevich neuron model, there are some parameter regions where each neuron arises fir- ing at the same time. We observed discontinuous changes of stability of the solutions in these regions. In this study, we regard these changes as a bifurcation phenomena. We present their examples and condition of the bifurcation. Fi- nally we calculate sets of the bifurcation.","ja":"In a coupled Izhikevich neuron model, there are some parameter regions where each neuron arises fir- ing at the same time. We observed discontinuous changes of stability of the solutions in these regions. In this study, we regard these changes as a bifurcation phenomena. We present their examples and condition of the bifurcation. Fi- nally we calculate sets of the bifurcation."},"is_international_presentation":true},"priority":"input_data"} line:33, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797893"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=322310","label":"url"}],"presentation_title":{"en":"A Switching Ripple Reduction Technique for Current-Controlled 1-Dimensional DC/DC Boost Converter","ja":"A Switching Ripple Reduction Technique for Current-Controlled 1-Dimensional DC/DC Boost Converter"},"presenters":{"en":[{"name":"Fukue, Hiroyuki"},{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Ohtagaki, Hirokazu"},{"name":"Asahara, Hiroyuki"}],"ja":[{"name":"Fukue, Hiroyuki"},{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"Ohtagaki, Hirokazu"},{"name":"Asahara, Hiroyuki"}]},"event":{"en":"Proc. NOLTA 2016","ja":"Proc. NOLTA 2016"},"publication_date":"2016-11-28","languages":["eng"],"location":{"en":"Yugawara","ja":"Yugawara"},"description":{"en":"In this paper, we demonstrate a switch- ing ripple reduction technique for current-controlled one- dimensional DC/DC boost converter. First, we show the circuit model, and then we explain behavior of the wave- form. Next, we define the discrete map by sampling the inductor current at clock interval. Based on the discrete map, we derive a controlling gain. Finally, we try to re- duce switching ripple of inductor current, and confirm the effectiveness of our controlling method.","ja":"In this paper, we demonstrate a switch- ing ripple reduction technique for current-controlled one- dimensional DC/DC boost converter. First, we show the circuit model, and then we explain behavior of the wave- form. Next, we define the discrete map by sampling the inductor current at clock interval. Based on the discrete map, we derive a controlling gain. Finally, we try to re- duce switching ripple of inductor current, and confirm the effectiveness of our controlling method."},"is_international_presentation":true},"priority":"input_data"} line:34, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797894"},"force":{"see_also":[{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-85010465159&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=320878","label":"url"}],"presentation_title":{"en":"A Route Navigation System for Reducing Risk of Traffic Accidents","ja":"A Route Navigation System for Reducing Risk of Traffic Accidents"},"presenters":{"en":[{"name":"Takeno Ryo"},{"name":"Seki Yosuke"},{"name":"Sano Masahiko"},{"name":"Matsuura Kenji"},{"name":"Ohira Kenji"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Takeno Ryo"},{"name":"関 陽介"},{"name":"佐野 雅彦"},{"name":"松浦 健二"},{"name":"大平 健司"},{"name":"上田 哲史"}]},"event":{"en":"Proceedings of IEEE 5th GCCE","ja":"Proceedings of IEEE 5th GCCE"},"publication_date":"2016-10-11","languages":["eng"],"promoter":{"en":"IEEE","ja":"IEEE"},"location":{"en":"Kyoto","ja":"Kyoto"},"is_international_presentation":true},"priority":"input_data"} line:35, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797895"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=326907","label":"url"}],"presentation_title":{"en":"A difficulty from chattering in bifurcation analysis of the circuit with a Josephson junction including piecewise linear property","ja":"A difficulty from chattering in bifurcation analysis of the circuit with a Josephson junction including piecewise linear property"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"美井野 優"},{"name":"上田 哲史"}]},"event":{"en":"Proc. IEEE TJCAS 2016","ja":"Proc. IEEE TJCAS 2016"},"publication_date":"2016-08","languages":["eng"],"location":{"en":"Tainan","ja":"Tainan"},"is_international_presentation":true},"priority":"input_data"} line:36, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797896"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=309480","label":"url"}],"presentation_title":{"en":"Automatic threshold adjustment for limit cycles holding a specified stability in hybrid systems","ja":"Automatic threshold adjustment for limit cycles holding a specified stability in hybrid systems"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Miino, Yuu"}],"ja":[{"name":"上田 哲史"},{"name":"美井野 優"}]},"event":{"en":"Proc. NCSP2016","ja":"Proc. NCSP2016"},"publication_date":"2016-03-09","languages":["eng"],"location":{"en":"Honolulu","ja":"Honolulu"},"description":{"en":"In this paper, we propose a method to compute the threshold value satisfying the given stability criterion. If this method is established, one can strengthen the limit cycle without changing any explicit parameter. In electronic circuit implementations, since such threshold value is usually realized by a reference voltage, thus no actual control energy is consumed regarding this adjustment.","ja":"In this paper, we propose a method to compute the threshold value satisfying the given stability criterion. If this method is established, one can strengthen the limit cycle without changing any explicit parameter. In electronic circuit implementations, since such threshold value is usually realized by a reference voltage, thus no actual control energy is consumed regarding this adjustment."},"is_international_presentation":true},"priority":"input_data"} line:37, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797897"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=305890","label":"url"}],"presentation_title":{"en":"Circuit Experiments for Bifurcation of TimeWaveforms on Forced LED Fireflies","ja":"Circuit Experiments for Bifurcation of TimeWaveforms on Forced LED Fireflies"},"presenters":{"en":[{"name":"Miyamoto, Kyosuke"},{"name":"Ito Daisuke"},{"name":"Asahara, Hiroyuki"},{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"Miyamoto, Kyosuke"},{"name":"伊藤 大輔"},{"name":"Asahara, Hiroyuki"},{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Proc. NOLTA 2015","ja":"Proc. NOLTA 2015"},"publication_date":"2015-12-04","languages":["eng"],"location":{"en":"Hong Kong","ja":"Hong Kong"},"description":{"en":"Creatures with rhythm phenomenon is shown mutual emphasis and combination, this is called synchronization phenomenon that is one of typical phenomenon in nonlinear systems. As the example of creatures causing synchronization phenomenon, there are group emissions of light of fireflies and chorus of crickets [1] [2] [3]. In this paper, we observe bifurcation phenomenon of periodic solutions on forced LED fireflies that constructed from an RC square wave generator with a periodic external force in order to simulate the synchronization of fireflies. On forced LED fireflies, characteristic periodic solutions called isolation periodic solution is observed at broad parameter regions. It can be considered these solutions causes synchronization phenomenon. Waveforms and periods of them are changed by border-collision bifurcations that are occurred by varying the frequency of an external force. Moreover, chaotic waveforms are observed at certain parameters. There can observe chaos waveform by a certain parameter.","ja":"Creatures with rhythm phenomenon is shown mutual emphasis and combination, this is called synchronization phenomenon that is one of typical phenomenon in nonlinear systems. As the example of creatures causing synchronization phenomenon, there are group emissions of light of fireflies and chorus of crickets [1] [2] [3]. In this paper, we observe bifurcation phenomenon of periodic solutions on forced LED fireflies that constructed from an RC square wave generator with a periodic external force in order to simulate the synchronization of fireflies. On forced LED fireflies, characteristic periodic solutions called isolation periodic solution is observed at broad parameter regions. It can be considered these solutions causes synchronization phenomenon. Waveforms and periods of them are changed by border-collision bifurcations that are occurred by varying the frequency of an external force. Moreover, chaotic waveforms are observed at certain parameters. There can observe chaos waveform by a certain parameter."},"is_international_presentation":true},"priority":"input_data"} line:38, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797898"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=305889","label":"url"}],"presentation_title":{"en":"Controlling Unstable Orbits via Varying Switching Time in a Simple Hybrid Dynamical Systems","ja":"Controlling Unstable Orbits via Varying Switching Time in a Simple Hybrid Dynamical Systems"},"presenters":{"en":[{"name":"Sasada, Tomoyuki"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Ohtagaki, Hirokazu"},{"name":"Kousaka Takuji"},{"name":"Asahara, Hiroyuki"}],"ja":[{"name":"Sasada, Tomoyuki"},{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"Ohtagaki, Hirokazu"},{"name":"高坂 拓司"},{"name":"Asahara, Hiroyuki"}]},"event":{"en":"Proc. NOLTA 2015","ja":"Proc. NOLTA 2015"},"publication_date":"2015-12-03","languages":["eng"],"location":{"en":"Hong Kong","ja":"Hong Kong"},"description":{"en":"In this paper, we discuss a controlling method of the switching time in the state- and perioddependent interrupted electric circuit. There are many state- and period-dependent interrupted electric circuits in the electrical engineering eld. Therefore, the controlling method reported in this paper is able to apply the practical circuits such as the dc/dc converters and dc/ac inverters. First, we explain the algorithm. Next, we show an example of the application by demonstrating the proposed algorithm to a simple state- and period-dependent interrupted electric circuit with one dimensional topology. Finally we discuss validity of the method.","ja":"In this paper, we discuss a controlling method of the switching time in the state- and perioddependent interrupted electric circuit. There are many state- and period-dependent interrupted electric circuits in the electrical engineering eld. Therefore, the controlling method reported in this paper is able to apply the practical circuits such as the dc/dc converters and dc/ac inverters. First, we explain the algorithm. Next, we show an example of the application by demonstrating the proposed algorithm to a simple state- and period-dependent interrupted electric circuit with one dimensional topology. Finally we discuss validity of the method."},"is_international_presentation":true},"priority":"input_data"} line:39, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797899"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=305888","label":"url"}],"presentation_title":{"en":"Bursting of transition dynamics on series coupled two operational amplifiers","ja":"Bursting of transition dynamics on series coupled two operational amplifiers"},"presenters":{"en":[{"name":"Ito Daisuke"},{"name":"Sekikawa, Munehisa"},{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"伊藤 大輔"},{"name":"Sekikawa, Munehisa"},{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Proc. NOLTA 2015","ja":"Proc. NOLTA 2015"},"publication_date":"2015-12-03","languages":["eng"],"location":{"en":"Hong Kong","ja":"Hong Kong"},"description":{"en":"Abstract|An operation ampli er (op-amp) is used in various electrical circuits and one of the most famous electronic devices. In general applications, op-amps behave as differential amplifiers, but in parameter miss matching or miss connections, the op-amp occurs complex high frequency oscillations. We nd complex oscillation phenomena in the modi ed simple oscillator with the op-amp, and that these phenomena depend on the dynamics of circuits and throughrates of op-amps.","ja":"Abstract|An operation ampli er (op-amp) is used in various electrical circuits and one of the most famous electronic devices. In general applications, op-amps behave as differential amplifiers, but in parameter miss matching or miss connections, the op-amp occurs complex high frequency oscillations. We nd complex oscillation phenomena in the modi ed simple oscillator with the op-amp, and that these phenomena depend on the dynamics of circuits and throughrates of op-amps."},"is_international_presentation":true},"priority":"input_data"} line:40, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797900"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=305887","label":"url"}],"presentation_title":{"en":"Laboratory experiment for bifurcation phenomena of the forced Alpazur oscillator","ja":"Laboratory experiment for bifurcation phenomena of the forced Alpazur oscillator"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"美井野 優"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA 2015","ja":"Proc. NOLTA 2015"},"publication_date":"2015-12-03","languages":["eng"],"location":{"en":"Hong Kong","ja":"Hong Kong"},"description":{"en":"This paper shows some results of laboratory experiment for bifurcation phenomena on the forced Al- pazur oscillator. The oscillator denotes some special phe- nomena in some parameter settings and are called chaos or bifurcation. The chaos is defined as the state of disorder and occurred by the bifurcation. Therefore the bifurcation should almost always be avoided to occur. Especially in these days, an idea to solve these problems on the forced Alpazur oscillator is proposed. However laboratory experi- ments for the idea have never been done. Laboratory exper- iments are important to confirm whether numerical analy- ses are correct or not.","ja":"This paper shows some results of laboratory experiment for bifurcation phenomena on the forced Al- pazur oscillator. The oscillator denotes some special phe- nomena in some parameter settings and are called chaos or bifurcation. The chaos is defined as the state of disorder and occurred by the bifurcation. Therefore the bifurcation should almost always be avoided to occur. Especially in these days, an idea to solve these problems on the forced Alpazur oscillator is proposed. However laboratory experi- ments for the idea have never been done. Laboratory exper- iments are important to confirm whether numerical analy- ses are correct or not."},"is_international_presentation":true},"priority":"input_data"} line:41, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797901"},"force":{"see_also":[{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-84957534699&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=300126","label":"url"}],"presentation_title":{"en":"Providing flexible authorization for shared group spaces by the attribute registration system","ja":"Providing flexible authorization for shared group spaces by the attribute registration system"},"presenters":{"en":[{"name":"Seki Yosuke"},{"name":"Matsuura Kenji"},{"name":"Sano Masahiko"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"関 陽介"},{"name":"松浦 健二"},{"name":"佐野 雅彦"},{"name":"上田 哲史"}]},"event":{"en":"Proc. of the 17th Asia-Pacific Network Operations and Management Symposium","ja":"Proc. of the 17th Asia-Pacific Network Operations and Management Symposium"},"publication_date":"2015-08","languages":["eng"],"location":{"en":"Busan","ja":"Busan"},"is_international_presentation":true},"priority":"input_data"} line:42, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797902"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=295360","label":"url"}],"presentation_title":{"en":"Circuit implementation of controlling chaos using pseudo periodic orbit","ja":"Circuit implementation of controlling chaos using pseudo periodic orbit"},"presenters":{"en":[{"name":"Mano, Shota"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Mano, Shota"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NCSP 2015","ja":"Proc. NCSP 2015"},"publication_date":"2015-03-01","languages":["eng"],"location":{"en":"Kuala Lumpur","ja":"Kuala Lumpur"},"is_international_presentation":true},"priority":"input_data"} line:43, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797903"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=295359","label":"url"}],"presentation_title":{"en":"Bifurcations and Phase Differences of Nonlinear Coupled Dictyostelium System","ja":"Bifurcations and Phase Differences of Nonlinear Coupled Dictyostelium System"},"presenters":{"en":[{"name":"Hishikawa, Kenji"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Hishikawa, Kenji"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NCSP 2015","ja":"Proc. NCSP 2015"},"publication_date":"2015-03-01","languages":["eng"],"location":{"en":"Kuala Lumpur","ja":"Kuala Lumpur"},"is_international_presentation":true},"priority":"input_data"} line:44, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797904"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=295358","label":"url"}],"presentation_title":{"en":"Stability control with a threshold value of the stepping motor","ja":"Stability control with a threshold value of the stepping motor"},"presenters":{"en":[{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NCSP 2015","ja":"Proc. NCSP 2015"},"publication_date":"2015-03-01","languages":["eng"],"location":{"en":"Kuala Lumpur","ja":"Kuala Lumpur"},"is_international_presentation":true},"priority":"input_data"} line:45, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797905"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=295357","label":"url"}],"presentation_title":{"en":"Bifurcation analysis for the forced Alpazur oscillator","ja":"Bifurcation analysis for the forced Alpazur oscillator"},"presenters":{"en":[{"name":"Miino, Yu"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Miino, Yu"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NCSP 2015","ja":"Proc. NCSP 2015"},"publication_date":"2015-03-01","languages":["eng"],"location":{"en":"Kuala Lumpur","ja":"Kuala Lumpur"},"is_international_presentation":true},"priority":"input_data"} line:46, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797906"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=288352","label":"url"}],"presentation_title":{"en":"Design and Implementation of Organizational Authorization for a Network Monitoring System","ja":"Design and Implementation of Organizational Authorization for a Network Monitoring System"},"presenters":{"en":[{"name":"Matsuura Kenji"},{"name":"Seki Yosuke"},{"name":"Sano Masahiko"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"松浦 健二"},{"name":"関 陽介"},{"name":"佐野 雅彦"},{"name":"上田 哲史"}]},"event":{"en":"Proceedings of the Second International Symposium on Computing and Networking","ja":"Proceedings of the Second International Symposium on Computing and Networking"},"publication_date":"2014-12-10","languages":["eng"],"promoter":{"en":"Conference Publishing Service","ja":"Conference Publishing Service"},"location":{"en":"Shizuoka, Japan","ja":"Shizuoka, Japan"},"is_international_presentation":true},"priority":"input_data"} line:47, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797907"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=285998","label":"url"}],"presentation_title":{"en":"Bifurcation analysis of coupled Izhikevich neuron model with an external periodic force","ja":"Bifurcation analysis of coupled Izhikevich neuron model with an external periodic force"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"美井野 優"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2014","ja":"Proc. NOLTA2014"},"publication_date":"2014-09-18","languages":["eng"],"location":{"en":"Luzern","ja":"Luzern"},"description":{"en":"The neuron model is an important when sim- ulating the behavior of the neurons. There are so many models developed (e.g., Fitz-Hugh-Nagumo, Integrated and Fire model, BVP, etc.) and there are also so many studies about these models[1] [5]. Especially, the model developed by Izhikevich[1] is focused recently because it can decrease numerical costs at simulation and express all patterns of burstings. In addition, the nonlinear phenom- ena, e.g. bifurcation phenomena or chaotic attractor, occur at this model since this is nonlinear non-autonomous sys- tem. In this paper, we focus on the nonlinear phenomena of coupled Izhikevich neuron model with external periodic force.","ja":"The neuron model is an important when sim- ulating the behavior of the neurons. There are so many models developed (e.g., Fitz-Hugh-Nagumo, Integrated and Fire model, BVP, etc.) and there are also so many studies about these models[1] [5]. Especially, the model developed by Izhikevich[1] is focused recently because it can decrease numerical costs at simulation and express all patterns of burstings. In addition, the nonlinear phenom- ena, e.g. bifurcation phenomena or chaotic attractor, occur at this model since this is nonlinear non-autonomous sys- tem. In this paper, we focus on the nonlinear phenomena of coupled Izhikevich neuron model with external periodic force."},"is_international_presentation":true},"priority":"input_data"} line:48, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797908"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=285997","label":"url"}],"presentation_title":{"en":"Pseudo periodic orbits and their stabilization","ja":"Pseudo periodic orbits and their stabilization"},"presenters":{"en":[{"name":"Mano, Shota"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Mano, Shota"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2014","ja":"Proc. NOLTA2014"},"publication_date":"2014-09-18","languages":["eng"],"location":{"en":"Luzern","ja":"Luzern"},"description":{"en":"In a chaotic attractor, some orbits looking like unstable periodic orbit are recognized. We call them pseudo periodic orbits and they are not proper periodic orbits but, we consider that they pre- serve similar properties to unstable periodic orbits. In this paper, we propose the method stabilizing the pseudo periodic orbit by using the external force con- trol. Although, the pseudo periodic orbit is an approx- imative unstable periodic orbit but it is found easily without any analytic approaches. We demonstrate the chaos controlling by using the pseudo periodic orbit for the Duffing equation with hysteresis characteristics.","ja":"In a chaotic attractor, some orbits looking like unstable periodic orbit are recognized. We call them pseudo periodic orbits and they are not proper periodic orbits but, we consider that they pre- serve similar properties to unstable periodic orbits. In this paper, we propose the method stabilizing the pseudo periodic orbit by using the external force con- trol. Although, the pseudo periodic orbit is an approx- imative unstable periodic orbit but it is found easily without any analytic approaches. We demonstrate the chaos controlling by using the pseudo periodic orbit for the Duffing equation with hysteresis characteristics."},"is_international_presentation":true},"priority":"input_data"} line:49, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797909"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=285996","label":"url"}],"presentation_title":{"en":"Bifurcation Analysis of Coupled Dictyostelium Oscillators","ja":"Bifurcation Analysis of Coupled Dictyostelium Oscillators"},"presenters":{"en":[{"name":"Hishikawa, Kenji"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Hishikawa, Kenji"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2014","ja":"Proc. NOLTA2014"},"publication_date":"2014-09-18","languages":["eng"],"location":{"en":"Luzern","ja":"Luzern"},"description":{"en":"In recent years, a new rhythm synchroniza- tion has been reported. The generalization of the function for receptors in the Dictyostelium by a nonlinear coupled oscillators realizes the synchronization. After that, this phenomena were investigated qualitatively by the averag- ing method. However, a relationship between synchroniza- tion modes and bifurcation phenomena has not been stud- ied. In this paper, we feature van der Pol equation into Nagano's model, and investigate bifurcation phenomena of the periodic solution and classify synchronization modes. We show bifurcation diagrams and some typical attractors.","ja":"In recent years, a new rhythm synchroniza- tion has been reported. The generalization of the function for receptors in the Dictyostelium by a nonlinear coupled oscillators realizes the synchronization. After that, this phenomena were investigated qualitatively by the averag- ing method. However, a relationship between synchroniza- tion modes and bifurcation phenomena has not been stud- ied. In this paper, we feature van der Pol equation into Nagano's model, and investigate bifurcation phenomena of the periodic solution and classify synchronization modes. We show bifurcation diagrams and some typical attractors."},"is_international_presentation":true},"priority":"input_data"} line:50, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797910"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=285995","label":"url"}],"presentation_title":{"en":"Border-collision bifurcations for the mathematical model of the TCP-RED","ja":"Border-collision bifurcations for the mathematical model of the TCP-RED"},"presenters":{"en":[{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2014","ja":"Proc. NOLTA2014"},"publication_date":"2014-09-18","languages":["eng"],"location":{"en":"Luzern","ja":"Luzern"},"description":{"en":"The transmission control protocol with the random early detection (TCP/RED) is an important algo- rithm for the TCP congestion control [1]. It has been mod- eled as a simple second-order discrete-time model, and it performs unique and typical nonlinear phenomena, e.g., bifurcation phenomena, or a chaotic attractor [2, 3]. In this paper, we focus on the discrete-time model of the TCP/RED, and investigate bifurcation structures of it.","ja":"The transmission control protocol with the random early detection (TCP/RED) is an important algo- rithm for the TCP congestion control [1]. It has been mod- eled as a simple second-order discrete-time model, and it performs unique and typical nonlinear phenomena, e.g., bifurcation phenomena, or a chaotic attractor [2, 3]. In this paper, we focus on the discrete-time model of the TCP/RED, and investigate bifurcation structures of it."},"is_international_presentation":true},"priority":"input_data"} line:51, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797911"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=278965","label":"url"}],"presentation_title":{"en":"Bifurcation phenomena of forced Izhikevich neuron model","ja":"Bifurcation phenomena of forced Izhikevich neuron model"},"presenters":{"en":[{"name":"Miino, Yu"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Miino, Yu"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NCSP 2014","ja":"Proc. NCSP 2014"},"publication_date":"2014-03-01","languages":["eng"],"location":{"en":"Honolulu","ja":"Honolulu"},"is_international_presentation":true},"priority":"input_data"} line:52, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797912"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=272334","label":"url"}],"presentation_title":{"en":"Attractor-Preserving Control to Avoid Saddle-Node Bifurcation","ja":"Attractor-Preserving Control to Avoid Saddle-Node Bifurcation"},"presenters":{"en":[{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Tsuji Shigeki"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"辻 繁樹"},{"name":"合原 一幸"}]},"event":{"en":"Proc. NOLTA 2013","ja":"Proc. NOLTA 2013"},"publication_date":"2013-09-08","languages":["eng"],"location":{"en":"Santa Fe","ja":"Santa Fe"},"is_international_presentation":true},"priority":"input_data"} line:53, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797913"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=262266","label":"url"}],"presentation_title":{"en":"Controlling Method to Avoid Bifurcations of Periodic Points Using Maximum Lyapunov Exponent","ja":"Controlling Method to Avoid Bifurcations of Periodic Points Using Maximum Lyapunov Exponent"},"presenters":{"en":[{"name":"Fujimoto Ken'ichi"},{"name":"Otsu, Tomohiro"},{"name":"Yoshinaga Tetsuya"},{"name":"Ueta Tetsushi"},{"name":"Kitajima Hiroyuki"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"藤本 憲市"},{"name":"大津, 智弘"},{"name":"吉永 哲哉"},{"name":"上田 哲史"},{"name":"北島 博之"},{"name":"合原 一幸"}]},"event":{"en":"Proc. of 2013 International Symposium on Nonlinear Theory and its Applications","ja":"Proc. of 2013 International Symposium on Nonlinear Theory and its Applications"},"publication_date":"2013-09-08","languages":["eng"],"location":{"en":"Santa Fe","ja":"Santa Fe"},"is_international_presentation":true},"priority":"input_data"} line:54, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797914"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=272336","label":"url"}],"presentation_title":{"en":"Restoration control for disappeared periodic solutions","ja":"Restoration control for disappeared periodic solutions"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Ito Daisuke"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"上田 哲史"},{"name":"伊藤 大輔"},{"name":"合原 一幸"}]},"event":{"en":"Proc. of 5th Int. Conf. Frontiers of Nonlinear Physics","ja":"Proc. of 5th Int. Conf. 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They are embedded into the chaotic attractor originally. Even as the system is attached the controller, there is possible that the system generate bi- furcation phenomena by the parameter perturbation. How- ever, Analysis of bifurcation phenomena on the system with controller are less discussed. In this paper, we consider the chaos controlling by using a pole assignment method for the logistic map, and investigate bifurcation phenomena on this system with controller. Additionally, by the bifurcation struc- ture, we indicate system and controller parameters with the robustness.","ja":"Chaos controlling techniques are intended to stabilize un- stable periodic orbits (UPOs). They are embedded into the chaotic attractor originally. Even as the system is attached the controller, there is possible that the system generate bi- furcation phenomena by the parameter perturbation. How- ever, Analysis of bifurcation phenomena on the system with controller are less discussed. In this paper, we consider the chaos controlling by using a pole assignment method for the logistic map, and investigate bifurcation phenomena on this system with controller. Additionally, by the bifurcation struc- ture, we indicate system and controller parameters with the robustness."},"is_international_presentation":true},"priority":"input_data"} line:57, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797917"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=260104","label":"url"}],"presentation_title":{"en":"Evaluation and Comparison of Controlling Energy","ja":"Evaluation and Comparison of Controlling Energy"},"presenters":{"en":[{"name":"Otsu, Tomohiro"},{"name":"Fujimoto Ken'ichi"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"大津, 智弘"},{"name":"藤本 憲市"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. of 2013 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing","ja":"Proc. of 2013 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing"},"publication_date":"2013-03-04","languages":["eng"],"location":{"en":"Kona","ja":"Kona"},"is_international_presentation":true},"priority":"input_data"} line:58, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797918"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=258998","label":"url"}],"presentation_title":{"en":"Evaluation and Comparison of Controlling Energy","ja":"Evaluation and Comparison of Controlling Energy"},"presenters":{"en":[{"name":"Otsu Tomohiro"},{"name":"Fujimoto Ken'ichi"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"大津 智弘"},{"name":"藤本 憲市"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proceedings of The 2012 IEEE Workshop on Nonlinear Circuit Networks","ja":"Proceedings of The 2012 IEEE Workshop on Nonlinear Circuit Networks"},"publication_date":"2012-12-14","languages":["eng"],"promoter":{"en":"IEEE","ja":"IEEE"},"location":{"en":"Tokushima","ja":"Tokushima"},"description":{"en":"OGY and delayed-feedback methods proposed at the beginning of 1990s are well known as the original methods of controlling chaos. One of the authors et al. also proposed a method of controlling chaos using Poincare map and linear control theory. All the methods can stabilize unstable periodic motions by making small perturbations of available system parameters. However, from the viewpoint of controlling energy needed to stabilize such motions, to evaluate the amount of required parameter perturbations has not been reported as far as the authors know. In this report, using three indices based on state variables, control input, and electric power (i.e. energy), we evaluated controlling costs to stabilize an unstable periodic motion observed in a continuous-time dynamical system such that the amount of parameter perturbations can be converted to electric power.","ja":"OGY and delayed-feedback methods proposed at the beginning of 1990s are well known as the original methods of controlling chaos. One of the authors et al. also proposed a method of controlling chaos using Poincare map and linear control theory. All the methods can stabilize unstable periodic motions by making small perturbations of available system parameters. However, from the viewpoint of controlling energy needed to stabilize such motions, to evaluate the amount of required parameter perturbations has not been reported as far as the authors know. In this report, using three indices based on state variables, control input, and electric power (i.e. energy), we evaluated controlling costs to stabilize an unstable periodic motion observed in a continuous-time dynamical system such that the amount of parameter perturbations can be converted to electric power."},"is_international_presentation":true},"priority":"input_data"} line:59, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797919"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=257999","label":"url"}],"presentation_title":{"en":"A Method for the Computation of Border Collision Bifurcation Point in a Piecewise Linear System with Interrupted Characteristics","ja":"A Method for the Computation of Border Collision Bifurcation Point in a Piecewise Linear System with Interrupted Characteristics"},"presenters":{"en":[{"name":"Tone, Yusuke"},{"name":"Asahara, Hiroyuki"},{"name":"Ueta Tetsushi"},{"name":"Aihara Kazuyuki"},{"name":"Kousaka Takuji"}],"ja":[{"name":"Tone, Yusuke"},{"name":"Asahara, Hiroyuki"},{"name":"上田 哲史"},{"name":"合原 一幸"},{"name":"高坂 拓司"}]},"event":{"en":"Proc. NOLTA 2012","ja":"Proc. NOLTA 2012"},"publication_date":"2012-10-22","languages":["eng"],"location":{"en":"Palma, Spain","ja":"Palma, Spain"},"description":{"en":"This paper proposes a simple method for analyzing the border-collision bifurcation point in a piecewise linear interrupted system. First, we show the system dynamics, and then we derive the Poincare map. Next, we explain the method for calculating the border-collision bifurcation point based on the Poincare map approach. Finally, we apply the method to the current mode controlled buck-boost converter. The analysis result will show the validity of the method.","ja":"This paper proposes a simple method for analyzing the border-collision bifurcation point in a piecewise linear interrupted system. First, we show the system dynamics, and then we derive the Poincare map. Next, we explain the method for calculating the border-collision bifurcation point based on the Poincare map approach. Finally, we apply the method to the current mode controlled buck-boost converter. The analysis result will show the validity of the method."},"is_international_presentation":true},"priority":"input_data"} line:60, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797920"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=278964","label":"url"}],"presentation_title":{"en":"Experimental Control of Chaos via Switching Threshold in an Interrupted Electric Circuit","ja":"Experimental Control of Chaos via Switching Threshold in an Interrupted Electric Circuit"},"presenters":{"en":[{"name":"Yamamoto, Y"},{"name":"Asahara, Hiroyuki"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Aihara Kazuyuki"},{"name":"Kousaka Takuji"}],"ja":[{"name":"Yamamoto, Y"},{"name":"Asahara, Hiroyuki"},{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"合原 一幸"},{"name":"高坂 拓司"}]},"event":{"en":"Proc. ITC-CSCC 2012","ja":"Proc. 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ISCAS 2012","ja":"Proc. ISCAS 2012"},"publication_date":"2012-05-21","languages":["eng"],"location":{"en":"Seoul","ja":"Seoul"},"description":{"en":"An energy saving control of unstable periodic orbits embedded in a hybrid chaotic system is proposed. The conventional controlling chaos methods utilize small perturbations of states or parameters as control input, however, quick time responses cannot be expected since the corresponding basins of attractions for higher periodic solutions become tiny. While If one allows a large perturbation to improve the time response, rather the total controlling energy which is proposed to the distance between the target orbit and the current orbit may increases. In this paper, when we consider the chaotic hybrid system, we noticed that we could utilize the perturbation of the referenced value for controlling, i.e., only a threshold value (Poincare mapping surface) is updated in control. No control input as a perturbation of the state or parameter value is applied to the system. In fact, the threshold value is used instantly when the feedback system determines the next updated threshold value. The variation of the threshold value can be obtained numerically by computing variational equations, and the control matrix is designed with the linear control theory. Since no affection to the state and parameters, it is emphasized that the total behavior of the controlled system is different from the conventional methods, especially it is unlike the impulsive control methods. We demonstrate this control method in a simple hybrid system and show that a large basin of attraction for the control is realized.","ja":"An energy saving control of unstable periodic orbits embedded in a hybrid chaotic system is proposed. The conventional controlling chaos methods utilize small perturbations of states or parameters as control input, however, quick time responses cannot be expected since the corresponding basins of attractions for higher periodic solutions become tiny. While If one allows a large perturbation to improve the time response, rather the total controlling energy which is proposed to the distance between the target orbit and the current orbit may increases. In this paper, when we consider the chaotic hybrid system, we noticed that we could utilize the perturbation of the referenced value for controlling, i.e., only a threshold value (Poincare mapping surface) is updated in control. No control input as a perturbation of the state or parameter value is applied to the system. In fact, the threshold value is used instantly when the feedback system determines the next updated threshold value. The variation of the threshold value can be obtained numerically by computing variational equations, and the control matrix is designed with the linear control theory. Since no affection to the state and parameters, it is emphasized that the total behavior of the controlled system is different from the conventional methods, especially it is unlike the impulsive control methods. We demonstrate this control method in a simple hybrid system and show that a large basin of attraction for the control is realized."},"is_international_presentation":true},"priority":"input_data"} line:63, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797923"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=245521","label":"url"}],"presentation_title":{"en":"On Investigation of the Intensity Scaling Factor in Fractal Image Coding","ja":"On Investigation of the Intensity Scaling Factor in Fractal Image Coding"},"presenters":{"en":[{"name":"Kitano Yoshinori"},{"name":"Ueta Tetsushi"},{"name":"Nishio Yoshifumi"},{"name":"Yang Guoan"},{"name":"Yang Yang"}],"ja":[{"name":"北野 圭則"},{"name":"上田 哲史"},{"name":"西尾 芳文"},{"name":"Yang Guoan"},{"name":"楊 暘"}]},"event":{"en":"Proc. NCSP 2012","ja":"Proc. 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ISIMM2011"},"publication_date":"2011-03-01","languages":["eng"],"location":{"en":"Tokyo","ja":"Tokyo"},"is_international_presentation":true},"priority":"input_data"} line:69, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797929"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=241205","label":"url"}],"presentation_title":{"en":"Delayed feedback control for dynamical systems with jumping characteristics","ja":"Delayed feedback control for dynamical systems with jumping characteristics"},"presenters":{"en":[{"name":"Nakanishi, Takaya"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Tsuji Shigeki"},{"name":"Imura, Jun'ichi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"Nakanishi, Takaya"},{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"辻 繁樹"},{"name":"Imura, Jun'ichi"},{"name":"合原 一幸"}]},"event":{"en":"Proc. ISIMM2011","ja":"Proc. 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ISIMM2011"},"publication_date":"2011-03-01","languages":["eng"],"location":{"en":"Tokyo","ja":"Tokyo"},"is_international_presentation":true},"priority":"input_data"} line:71, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797931"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=214182","label":"url"}],"presentation_title":{"en":"Bridging Multiple Motor-Skills in a Community Site","ja":"Bridging Multiple Motor-Skills in a Community Site"},"presenters":{"en":[{"name":"Matsuura Kenji"},{"name":"Gotoda Naka"},{"name":"Ueta Tetsushi"},{"name":"Yano Yoneo"}],"ja":[{"name":"松浦 健二"},{"name":"後藤田 中"},{"name":"上田 哲史"},{"name":"矢野 米雄"}]},"event":{"en":"Knowledge-Based Intelligent Information and Engineering Systems","ja":"Knowledge-Based Intelligent Information and Engineering Systems"},"publication_date":"2010-09-08","languages":["eng"],"promoter":{"en":"Springer-Verlag","ja":"Springer-Verlag"},"location":{"en":"Cardiff, UK","ja":"Cardiff, UK"},"description":{"en":"This paper touches upon the design issue for multiple skill development of human beings in an online community environment. It focuses on motor skills such as rope-skipping, running, swimming and so forth in the physical world. The approach attempts to adopt social networking service for mutual contribution on that purpose as the base of online communication. In order to treat various sorts of skill, the web-based system allows community authors to handle several types of media for storing records of skill training of individuals and representing them in the system. This study developed such an environment and made trial use for the first stage.","ja":"This paper touches upon the design issue for multiple skill development of human beings in an online community environment. It focuses on motor skills such as rope-skipping, running, swimming and so forth in the physical world. The approach attempts to adopt social networking service for mutual contribution on that purpose as the base of online communication. In order to treat various sorts of skill, the web-based system allows community authors to handle several types of media for storing records of skill training of individuals and representing them in the system. This study developed such an environment and made trial use for the first stage."},"is_international_presentation":true},"priority":"input_data"} line:72, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797932"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=214735","label":"url"}],"presentation_title":{"en":"Accurate Formulas Locating Unstable Periodic Points in Chaos","ja":"Accurate Formulas Locating Unstable Periodic Points in Chaos"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Nagao, Kei"}],"ja":[{"name":"上田 哲史"},{"name":"Nagao, Kei"}]},"event":{"en":"Proc. NOLTA2010","ja":"Proc. NOLTA2010"},"publication_date":"2010-09-04","languages":["eng"],"location":{"en":"Cracow","ja":"Cracow"},"description":{"en":"We have studied fractal nature of patterns given by the directional coloring for chaotic attractors. With this method, unstable periodic points are visualized as concentrated points or crossing points in the state space. A fractal pattern around the specific unstable fixed point are identified as a formula derived from relationship among neighbor unstable periodic points. In this paper, we try to model an accurate formula giving locations of unstable periodic points. Higher periodic points are predicted by the obtained formula. Some numerical examples are shown.","ja":"We have studied fractal nature of patterns given by the directional coloring for chaotic attractors. With this method, unstable periodic points are visualized as concentrated points or crossing points in the state space. A fractal pattern around the specific unstable fixed point are identified as a formula derived from relationship among neighbor unstable periodic points. In this paper, we try to model an accurate formula giving locations of unstable periodic points. Higher periodic points are predicted by the obtained formula. Some numerical examples are shown."},"is_international_presentation":true},"priority":"input_data"} line:73, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797933"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=214734","label":"url"}],"presentation_title":{"en":"Bifurcation Analysis of Coupled Nagumo-Sato Models","ja":"Bifurcation Analysis of Coupled Nagumo-Sato Models"},"presenters":{"en":[{"name":"Kinoshita, Kazutoshi"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Kinoshita, Kazutoshi"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2010","ja":"Proc. NOLTA2010"},"publication_date":"2010-09-04","languages":["eng"],"location":{"en":"Cracow","ja":"Cracow"},"description":{"en":"The Nagumo-Sato model is one of mathe- matical neuron models described by a piecewise linear dif- ference equation. Since there is a conditional character which is discontinuous at the threshold value, the system can be classified as a hybrid dynamical system. Bifurca- tion phenomena are occurred by changing internal param- eters and chaotic attractors are also given. The dynamical properties were exactly studied analytically. In this paper, we investigate the bifurcations of diffusively-coupled Nagumo-Sato models. By using com- plementarity a shooting algorithm and brute-force method, complete bifurcation diagrams are obtained. In spite of the discontinuities inside the coupled system, our shoot- ing method can solve bifurcation problems. A period- locking regions edged by border-collision bifurcation sets are found, and chaotic regions are distinguished by a tan- gent bifurcation. We discuss on changing bifurcation struc- tures with parameter variations.","ja":"The Nagumo-Sato model is one of mathe- matical neuron models described by a piecewise linear dif- ference equation. Since there is a conditional character which is discontinuous at the threshold value, the system can be classified as a hybrid dynamical system. Bifurca- tion phenomena are occurred by changing internal param- eters and chaotic attractors are also given. The dynamical properties were exactly studied analytically. In this paper, we investigate the bifurcations of diffusively-coupled Nagumo-Sato models. By using com- plementarity a shooting algorithm and brute-force method, complete bifurcation diagrams are obtained. In spite of the discontinuities inside the coupled system, our shoot- ing method can solve bifurcation problems. A period- locking regions edged by border-collision bifurcation sets are found, and chaotic regions are distinguished by a tan- gent bifurcation. We discuss on changing bifurcation struc- tures with parameter variations."},"is_international_presentation":true},"priority":"input_data"} line:74, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797934"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=214733","label":"url"}],"presentation_title":{"en":"Bifurcation Analysis of Two Coupled Izhikevich Oscillators","ja":"Bifurcation Analysis of Two Coupled Izhikevich Oscillators"},"presenters":{"en":[{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2010","ja":"Proc. NOLTA2010"},"publication_date":"2010-09-04","languages":["eng"],"location":{"en":"Cracow","ja":"Cracow"},"description":{"en":"A simple oscillator of spiking neurons is pro- posed by Izhikevich. By some numerical experiments, all firing patterns which have been observed in the brain are confirmed at the origin of the mathematical model. Al- though, a detailed bifurcation analysis has been given by the author, no investigation on its coupling system has been done. In this paper, we consider two Izhikevich neurons coupled by a gap junction. By choosing an appropriate Poincare section, we can compute bifurcation set for limit cycles. As a result, period-doubling bifurcation and its cas- cade to chaos is observed by changing the coupling coeffi- cient. We show bifurcation diagrams and numerical simu- lation results.","ja":"A simple oscillator of spiking neurons is pro- posed by Izhikevich. By some numerical experiments, all firing patterns which have been observed in the brain are confirmed at the origin of the mathematical model. Al- though, a detailed bifurcation analysis has been given by the author, no investigation on its coupling system has been done. In this paper, we consider two Izhikevich neurons coupled by a gap junction. By choosing an appropriate Poincare section, we can compute bifurcation set for limit cycles. As a result, period-doubling bifurcation and its cas- cade to chaos is observed by changing the coupling coeffi- cient. We show bifurcation diagrams and numerical simu- lation results."},"is_international_presentation":true},"priority":"input_data"} line:75, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797935"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=278962","label":"url"}],"presentation_title":{"en":"Design of the Poincare Mapping of Piecewise Linear Systems","ja":"Design of the Poincare Mapping of Piecewise Linear Systems"},"presenters":{"en":[{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NCSP 2010","ja":"Proc. NCSP 2010"},"publication_date":"2010-03-04","languages":["eng"],"promoter":{"en":"The Research Institute of Signal Processing Japan","ja":"The Research Institute of Signal Processing Japan"},"location":{"en":"Honolulu","ja":"Honolulu"},"is_international_presentation":true},"priority":"input_data"} line:76, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797936"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=214909","label":"url"}],"presentation_title":{"en":"A Pilot Project toward Implementation of a Short-Term Exchange Program between an Affiliated University and The University of Tokushima","ja":"A Pilot Project toward Implementation of a Short-Term Exchange Program between an Affiliated University and The University of Tokushima"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Nishio Yoshifumi"}],"ja":[{"name":"上田 哲史"},{"name":"西尾 芳文"}]},"event":{"en":"Proceedings of the Fourth International Symposium on the Development of the Global Double Degree Program (GDDP)","ja":"Proceedings of the Fourth International Symposium on the Development of the Global Double Degree Program (GDDP)"},"publication_date":"2009-12-14","languages":["eng"],"location":{"en":"Tokushima","ja":"Tokushima"},"is_international_presentation":true},"priority":"input_data"} line:77, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797937"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=196199","label":"url"}],"presentation_title":{"en":"A Structural Detection of Unstable Periodic Points in Chaotic Attractors by the Directional Coloring","ja":"A Structural Detection of Unstable Periodic Points in Chaotic Attractors by the Directional Coloring"},"presenters":{"en":[{"name":"Nagao, Kei"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Nagao, Kei"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA'09","ja":"Proc. NOLTA'09"},"publication_date":"2009-10-20","languages":["eng"],"location":{"en":"Sapporo","ja":"Sapporo"},"description":{"en":"We propose an application of the visualization method called directional coloring by using mapping direction of the difference equation. An invariant pattern can be detected for a given chaotic attractor with this coloring. Unstable periodic points(UPPs) are visualized as a crossing points of different colors and these locations are determined by the pattern. With this property and thanks to Newton's mehtod, we can compute UPPs systematically and accurately. We show numerical results and their fractal nature.","ja":"We propose an application of the visualization method called directional coloring by using mapping direction of the difference equation. An invariant pattern can be detected for a given chaotic attractor with this coloring. Unstable periodic points(UPPs) are visualized as a crossing points of different colors and these locations are determined by the pattern. With this property and thanks to Newton's mehtod, we can compute UPPs systematically and accurately. We show numerical results and their fractal nature."},"is_international_presentation":true},"priority":"input_data"} line:78, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797938"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=196198","label":"url"}],"presentation_title":{"en":"Bifurcation Analysis of the Lozi Map --- as a Hybrid System","ja":"Bifurcation Analysis of the Lozi Map --- as a Hybrid System"},"presenters":{"en":[{"name":"Kinoshita, Kazutoshi"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Kinoshita, Kazutoshi"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOMA'09","ja":"Proc. NOMA'09"},"publication_date":"2009-09-10","languages":["eng"],"location":{"en":"Urbino, Italy","ja":"Urbino, Italy"},"description":{"en":"We analyze bifurcations observed in the Lozi system. Since the state space is not differentiable at x = 0, the system becomes non invertible, and the solution and corresponding variations are not expressed by elementary functions, although the system is described by a piecewise linear equation. The system is classified as one of hybrid systems because of this non-smoothness. In spite of this factor, the orbit and variations can be differentiable at any moment except for x = 0, 1st and 2nd variations are obtained numerically, thus, in this paper, we compute bifurcations of the Lozi map by using a shooting method. We also report a special degenerated stable attractors keeping the Lyapunov stability criterion.","ja":"We analyze bifurcations observed in the Lozi system. Since the state space is not differentiable at x = 0, the system becomes non invertible, and the solution and corresponding variations are not expressed by elementary functions, although the system is described by a piecewise linear equation. The system is classified as one of hybrid systems because of this non-smoothness. In spite of this factor, the orbit and variations can be differentiable at any moment except for x = 0, 1st and 2nd variations are obtained numerically, thus, in this paper, we compute bifurcations of the Lozi map by using a shooting method. We also report a special degenerated stable attractors keeping the Lyapunov stability criterion."},"is_international_presentation":true},"priority":"input_data"} line:79, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797939"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=194806","label":"url"}],"presentation_title":{"en":"Synchronization of Coupled BVP Oscillators","ja":"Synchronization of Coupled BVP Oscillators"},"presenters":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"event":{"en":"No proceedings","ja":"No proceedings"},"publication_date":"2009-05-22","invited":true,"languages":["eng"],"promoter":{"en":"IWCESD2009","ja":"IWCESD2009"},"location":{"en":"Hong Kong","ja":"Hong Kong"},"is_international_presentation":true},"priority":"input_data"} line:80, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797940"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=177546","label":"url"}],"presentation_title":{"en":"Bifurcation Analysis of Chaos Synchronization in Coupled BVP Oscillators","ja":"Bifurcation Analysis of Chaos Synchronization in Coupled BVP Oscillators"},"presenters":{"en":[{"name":"Nishioka, Satoshi"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Nishioka, Satoshi"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA'08","ja":"Proc. NOLTA'08"},"publication_date":"2008-09-05","languages":["eng"],"location":{"en":"Budapest","ja":"Budapest"},"description":{"en":"In this paper, we investigate three chaotic BVP oscillators which are resistively coupled as a ring. Since all parameters of oscillators are identical, attractors appeared in the system have a strong symmetrical properties observed in the individual oscillator. We found completely in-phase synchronization for periodic solutions and chaos. Also 3-phase synchronized tori and self-switching synchronized chaos. We show some bifurcation diagrams to explain the parameter regions exhibiting these attractors.","ja":"In this paper, we investigate three chaotic BVP oscillators which are resistively coupled as a ring. Since all parameters of oscillators are identical, attractors appeared in the system have a strong symmetrical properties observed in the individual oscillator. We found completely in-phase synchronization for periodic solutions and chaos. Also 3-phase synchronized tori and self-switching synchronized chaos. We show some bifurcation diagrams to explain the parameter regions exhibiting these attractors."},"is_international_presentation":true},"priority":"input_data"} line:81, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797941"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=177545","label":"url"}],"presentation_title":{"en":"Bifurcation analysis of Izhikevich model","ja":"Bifurcation analysis of Izhikevich model"},"presenters":{"en":[{"name":"Tamura, Akihisa"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Tamura, Akihisa"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA'08","ja":"Proc. NOLTA'08"},"publication_date":"2008-09-05","languages":["eng"],"location":{"en":"Budapest","ja":"Budapest"},"description":{"en":"A simple model of spiking neurons is proposed by Izhikevich. As some experimental results, origin of the mathematical model, firing pattern of all known types of neurons a re reported. However bifurcation analysis has not been investigated in details. In this paper, in order to discuss dynamical properties of this model, we compute bifurcation sets by using bifurcation theory. We clarify non-oscillatory, oscillatory and chaotic regions in the parameter plane.","ja":"A simple model of spiking neurons is proposed by Izhikevich. As some experimental results, origin of the mathematical model, firing pattern of all known types of neurons a re reported. However bifurcation analysis has not been investigated in details. In this paper, in order to discuss dynamical properties of this model, we compute bifurcation sets by using bifurcation theory. We clarify non-oscillatory, oscillatory and chaotic regions in the parameter plane."},"is_international_presentation":true},"priority":"input_data"} line:82, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797942"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=177544","label":"url"}],"presentation_title":{"en":"Numerical Bifurcation Analysis of Systems with Variable Switching Conditions","ja":"Numerical Bifurcation Analysis of Systems with Variable Switching Conditions"},"presenters":{"en":[{"name":"Brandon, Quentin"},{"name":"Ueta Tetsushi"},{"name":"Kousaka Takuji"},{"name":"Fournier-Prunaret, Dani\\'ele"}],"ja":[{"name":"Brandon, Quentin"},{"name":"上田 哲史"},{"name":"高坂 拓司"},{"name":"Fournier-Prunaret, Dani\\'ele"}]},"event":{"en":"Proc. NOLTA'08","ja":"Proc. NOLTA'08"},"publication_date":"2008-09-05","languages":["eng"],"location":{"en":"Budapest","ja":"Budapest"},"description":{"en":"In this paper, we consider a method of numerical bifurcation analysis of nonlinear switched autonomous systems. Its development is motivated by several factors: linear systems can be studied through analytical approaches; smooth and non-autonomous systems can be studied using a standard periodical Poincar´e map. Our goal is to develop a method as general as possible and implement it as a computer-based tool. The main evolution we will describe this time is the possible treatment of variable switching conditions.","ja":"In this paper, we consider a method of numerical bifurcation analysis of nonlinear switched autonomous systems. Its development is motivated by several factors: linear systems can be studied through analytical approaches; smooth and non-autonomous systems can be studied using a standard periodical Poincar´e map. Our goal is to develop a method as general as possible and implement it as a computer-based tool. The main evolution we will describe this time is the possible treatment of variable switching conditions."},"is_international_presentation":true},"priority":"input_data"} line:83, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797943"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=177543","label":"url"}],"presentation_title":{"en":"Bifurcation and chaos in switched autonomous systems","ja":"Bifurcation and chaos in switched autonomous systems"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Brandon, Quentin"},{"name":"Tamura, Akihisa"},{"name":"Kousaka Takuji"}],"ja":[{"name":"上田 哲史"},{"name":"Brandon, Quentin"},{"name":"Tamura, Akihisa"},{"name":"高坂 拓司"}]},"event":{"en":"Proc. NDES'08","ja":"Proc. NDES'08"},"publication_date":"2008-07-25","invited":true,"languages":["eng"],"location":{"en":"Nizhny Novgorod","ja":"Nizhny Novgorod"},"description":{"en":"In the fields of circuits and systems, there are many discontinuous situations in their characteristics or operations. Rather we affirmatively utilize these property to obtain quick responses or apply various signal processing. Switching, impulsive trains, break points, bending points, borders, hystereses, threshold values, and cut-in voltages are example factors making the systems discontinuous. Especially analysis on a nonlinear circuit with these discontinuity becomes a very difficult problem. In addition, continuous characteristics for derivatives of the state and parameters are required for the general way of analysis for nonlinear systems, thus even the case using a periodic rectangular wave source cannot be treated directly. Bifurcation problems in circuits with above characteristics are discussed within very limited categories1;2. Piecewise linear systems have been intensively investigated for two decades because solutions the systems and their derivatives are obtained exactly, for instance, various converters, Chua's circuit3, hysteresis circuits and so on. Only a numerical computation of the return time or the period is required for bifurcation analysis. Approximation of the piecewise linear characteristics by smooth functions is often tried, especially for the Chua's circuit. While, discontinuous characteristics are also observed in physical systems, e.g., impulsive behavior in neuronal and biological activities. The problem is loosing continuity of the state, or its variations. In general, smooth functions are naturally assumed in analyzing process, in fact, without this assumption, it is unable to obtain derivatives of the state and its variations needed for Jacobian matrix in the shooting method. Above approximation is avoidance of this difficulty. Even if the given system equation and the state are continuous, computation of information about dynamical behavior requires continuity of their derivatives. Assume that we have now a piecewise autonomous nonlinear system. The system equation may be given in nonlinear ordinary differential equations with some conditional statements. Then the following equation is held piecewisely, such as dx/dt = fk(x), k = 0, 1, 2, . . .m, x(0) = x0. We have developed a general framework of bifurcation analysis for dynamical systems including discontinuous characteristics4. For piecewise nonlinear autonomous systems, more careful treatment is needed. Indeed the characteristic equation directly induced from the Jacobian matrix of the composite Poincar´e map does not contains correct multipliers of the limit cycle.","ja":"In the fields of circuits and systems, there are many discontinuous situations in their characteristics or operations. Rather we affirmatively utilize these property to obtain quick responses or apply various signal processing. Switching, impulsive trains, break points, bending points, borders, hystereses, threshold values, and cut-in voltages are example factors making the systems discontinuous. Especially analysis on a nonlinear circuit with these discontinuity becomes a very difficult problem. In addition, continuous characteristics for derivatives of the state and parameters are required for the general way of analysis for nonlinear systems, thus even the case using a periodic rectangular wave source cannot be treated directly. Bifurcation problems in circuits with above characteristics are discussed within very limited categories1;2. Piecewise linear systems have been intensively investigated for two decades because solutions the systems and their derivatives are obtained exactly, for instance, various converters, Chua's circuit3, hysteresis circuits and so on. Only a numerical computation of the return time or the period is required for bifurcation analysis. Approximation of the piecewise linear characteristics by smooth functions is often tried, especially for the Chua's circuit. While, discontinuous characteristics are also observed in physical systems, e.g., impulsive behavior in neuronal and biological activities. The problem is loosing continuity of the state, or its variations. In general, smooth functions are naturally assumed in analyzing process, in fact, without this assumption, it is unable to obtain derivatives of the state and its variations needed for Jacobian matrix in the shooting method. Above approximation is avoidance of this difficulty. Even if the given system equation and the state are continuous, computation of information about dynamical behavior requires continuity of their derivatives. Assume that we have now a piecewise autonomous nonlinear system. The system equation may be given in nonlinear ordinary differential equations with some conditional statements. Then the following equation is held piecewisely, such as dx/dt = fk(x), k = 0, 1, 2, . . .m, x(0) = x0. We have developed a general framework of bifurcation analysis for dynamical systems including discontinuous characteristics4. For piecewise nonlinear autonomous systems, more careful treatment is needed. Indeed the characteristic equation directly induced from the Jacobian matrix of the composite Poincar´e map does not contains correct multipliers of the limit cycle."},"is_international_presentation":true},"priority":"input_data"} line:84, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797944"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=174203","label":"url"}],"presentation_title":{"en":"Visualization of unstable periodic points embedded in chaotic attractors by the directional coloring","ja":"Visualization of unstable periodic points embedded in chaotic attractors by the directional coloring"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Proc. NOMA'07","ja":"Proc. NOMA'07"},"publication_date":"2007-12-14","languages":["eng"],"location":{"en":"Toulouse","ja":"Toulouse"},"description":{"en":"We propose a new visualization method called directional coloring for chaotic attractors in two-dimensional discrete systems. The argument defined by the current point of the solution orbit and its n-th mapped point is assigned into the hue circle in the HSV color system. For a given system, the vector field of the n-th powered system is visualized by this method. As singular points, n-periodic points are emerged as concentrating points of colors. We also reduce the computation time by featuring the brute-force method for the directional coloring, and illustrate a detection method of unstable periodic points in a chaotic attractor as an application.","ja":"We propose a new visualization method called directional coloring for chaotic attractors in two-dimensional discrete systems. The argument defined by the current point of the solution orbit and its n-th mapped point is assigned into the hue circle in the HSV color system. For a given system, the vector field of the n-th powered system is visualized by this method. As singular points, n-periodic points are emerged as concentrating points of colors. We also reduce the computation time by featuring the brute-force method for the directional coloring, and illustrate a detection method of unstable periodic points in a chaotic attractor as an application."},"is_international_presentation":true},"priority":"input_data"} line:85, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797945"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=174202","label":"url"}],"presentation_title":{"en":"Method of Bifurcation Analysis of Hybrid Nonlinear Systems","ja":"Method of Bifurcation Analysis of Hybrid Nonlinear Systems"},"presenters":{"en":[{"name":"Brandon, Quentin"},{"name":"Ueta Tetsushi"},{"name":"Fournier-Prunaret, Daniele"}],"ja":[{"name":"Brandon, Quentin"},{"name":"上田 哲史"},{"name":"Fournier-Prunaret, Daniele"}]},"event":{"en":"Proc. NOMA'07","ja":"Proc. NOMA'07"},"publication_date":"2007-12-14","languages":["eng"],"location":{"en":"Toulouse","ja":"Toulouse"},"description":{"en":"Systems showing continuous and discrete dimensions, in other words hybrid systems, are present in many domains such as mechanical (apparition of frictions) or electronic systems (switching component). The solution function usually remains continuous but presents points of non-derivability where discrete changes occur. Some of the most widely studied applications are usually related to electrical engineering, such as power converters investigated as piecewise smooth systems by di Bernardo [1], Tse [2] or Banerjee [3][4]; or some PLL models as introduced By Acco [5], refering to this type of model as ``hybrid sequential.'' Little work has been done in the bifurcation analysis of nonlinear hybrid models, apart from Kawakami, Ueta and Kousaka [7][8]. As for hybrid linear models, they can be analysed using rigorous analytical methods, so exact solutions are obtained and used for analyses of the total dynamical behavior, as did Kabe [6]. But the nonlinear characteristics of many systems make this option possible only for approximations. Instead, we prefer using numerical methods. We propose using a Poincar´e map in order to obtain a discrete linearized approximation and conduct the bifurcation analysis using conventional methods. We consider the analysis results of the Alpazur oscillator, which reveals an unsual bifurcation structure: the interactions between the equilibrium point at some state and the corresponding switching condition make appear a fractal bifurcation structure, with an infinite number of bifurcation curves focusing towards a limit set.","ja":"Systems showing continuous and discrete dimensions, in other words hybrid systems, are present in many domains such as mechanical (apparition of frictions) or electronic systems (switching component). The solution function usually remains continuous but presents points of non-derivability where discrete changes occur. Some of the most widely studied applications are usually related to electrical engineering, such as power converters investigated as piecewise smooth systems by di Bernardo [1], Tse [2] or Banerjee [3][4]; or some PLL models as introduced By Acco [5], refering to this type of model as ``hybrid sequential.'' Little work has been done in the bifurcation analysis of nonlinear hybrid models, apart from Kawakami, Ueta and Kousaka [7][8]. As for hybrid linear models, they can be analysed using rigorous analytical methods, so exact solutions are obtained and used for analyses of the total dynamical behavior, as did Kabe [6]. But the nonlinear characteristics of many systems make this option possible only for approximations. Instead, we prefer using numerical methods. We propose using a Poincar´e map in order to obtain a discrete linearized approximation and conduct the bifurcation analysis using conventional methods. We consider the analysis results of the Alpazur oscillator, which reveals an unsual bifurcation structure: the interactions between the equilibrium point at some state and the corresponding switching condition make appear a fractal bifurcation structure, with an infinite number of bifurcation curves focusing towards a limit set."},"is_international_presentation":true},"priority":"input_data"} line:86, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797946"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=171023","label":"url"}],"presentation_title":{"en":"Bifurcation analysis for a simple chaotic circuit and its coupled systems","ja":"Bifurcation analysis for a simple chaotic circuit and its coupled systems"},"presenters":{"en":[{"name":"Tamura, Akihisa"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Tamura, Akihisa"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA'07","ja":"Proc. NOLTA'07"},"publication_date":"2007-09-16","languages":["eng"],"location":{"en":"Vancouver","ja":"Vancouver"},"description":{"en":"Tamasevicius et. al proposed a very simple chaotic oscillator. Some experimental results, origin of the mathematical model, and numerical simulations are reported. However, bifurcation analysis has not been investigated in details. In this paper, we compute bifurcation sets of this model by using bifurcation theory and discuss its dynamical properties. The bifurcation structures are identified in various parameter planes. Moreover we investigate chaos synchronization in its coupled system. Synchronization of periodic and chaotic states are depicted in the bifurcation diagram, and it is clarified that the period-doubling bifurcation is deeply related to desynchronization.","ja":"Tamasevicius et. al proposed a very simple chaotic oscillator. Some experimental results, origin of the mathematical model, and numerical simulations are reported. However, bifurcation analysis has not been investigated in details. In this paper, we compute bifurcation sets of this model by using bifurcation theory and discuss its dynamical properties. The bifurcation structures are identified in various parameter planes. Moreover we investigate chaos synchronization in its coupled system. Synchronization of periodic and chaotic states are depicted in the bifurcation diagram, and it is clarified that the period-doubling bifurcation is deeply related to desynchronization."},"is_international_presentation":true},"priority":"input_data"} line:87, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797947"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=171022","label":"url"}],"presentation_title":{"en":"Chaos in a Switched Dynamical System: Scicos as a Modeler and Simulator","ja":"Chaos in a Switched Dynamical System: Scicos as a Modeler and Simulator"},"presenters":{"en":[{"name":"El Guezar, Fatima"},{"name":"Bouzahir, Hassane"},{"name":"Ueta Tetsushi"},{"name":"Acco, Pascal"}],"ja":[{"name":"El Guezar, Fatima"},{"name":"Bouzahir, Hassane"},{"name":"上田 哲史"},{"name":"Acco, Pascal"}]},"event":{"en":"Proc. NOLTA'07","ja":"Proc. NOLTA'07"},"publication_date":"2007-09-16","languages":["eng"],"location":{"en":"Vancouver","ja":"Vancouver"},"description":{"en":"In this paper, we explore some modeling capabilities of Scicos. Our aim is to generate chaos from a simple hybrid dynamical system. We give the chaotic dynamics of the current-programmed boost converter in open-loop circuit as a case study. By considering two bifurcation parameters the current reference and the voltage input, we observe that the obtained Scicos simulations show that the boost converter is prone to subharmonic behavior and chaos. We also present the corresponding bifurcation diagrams. We use Scicos because it provides a much clearer understanding of the way the model will behave during simulation reducing considerably the risk of ambiguity.","ja":"In this paper, we explore some modeling capabilities of Scicos. Our aim is to generate chaos from a simple hybrid dynamical system. We give the chaotic dynamics of the current-programmed boost converter in open-loop circuit as a case study. By considering two bifurcation parameters the current reference and the voltage input, we observe that the obtained Scicos simulations show that the boost converter is prone to subharmonic behavior and chaos. We also present the corresponding bifurcation diagrams. We use Scicos because it provides a much clearer understanding of the way the model will behave during simulation reducing considerably the risk of ambiguity."},"is_international_presentation":true},"priority":"input_data"} line:88, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797948"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=171021","label":"url"}],"presentation_title":{"en":"Local Bifurcations of Nonlinear Hybrid Systems","ja":"Local Bifurcations of Nonlinear Hybrid Systems"},"presenters":{"en":[{"name":"Brandon, Quentin"},{"name":"Ueta Tetsushi"},{"name":"Kousaka Takuji"},{"name":"Fournier-Prunaret, Dani\\'ele"}],"ja":[{"name":"Brandon, Quentin"},{"name":"上田 哲史"},{"name":"高坂 拓司"},{"name":"Fournier-Prunaret, Dani\\'ele"}]},"event":{"en":"Proc. NOLTA'07","ja":"Proc. NOLTA'07"},"publication_date":"2007-09-16","languages":["eng"],"location":{"en":"Vancouver","ja":"Vancouver"},"description":{"en":"As most analysis tools for nonlinear dynamical systems are dedicated to either continuous or discrete models, we propose an analysismethod for hybrid systems. Using the Poincar´e map, we transform the results of partial analysis over the continuous components into a discrete mapping. We can then apply more conventionalmethods in order to seek for critical values and obtain bifurcation diagrams in the parameters space. In this paper, we describe this method, discuss different approaches to conduct such analysis, and finally present an application example with a 3-state Alpazur oscillator.","ja":"As most analysis tools for nonlinear dynamical systems are dedicated to either continuous or discrete models, we propose an analysismethod for hybrid systems. Using the Poincar´e map, we transform the results of partial analysis over the continuous components into a discrete mapping. We can then apply more conventionalmethods in order to seek for critical values and obtain bifurcation diagrams in the parameters space. In this paper, we describe this method, discuss different approaches to conduct such analysis, and finally present an application example with a 3-state Alpazur oscillator."},"is_international_presentation":true},"priority":"input_data"} line:89, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797949"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=162610","label":"url"}],"presentation_title":{"en":"Bifurcation Analysis of Duffing-Rayleigh Equation","ja":"Bifurcation Analysis of Duffing-Rayleigh Equation"},"presenters":{"en":[{"name":"Mizumoto Masaaki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"水本 匡昭"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Proc. NDES2007","ja":"Proc. NDES2007"},"publication_date":"2007-07-26","languages":["eng"],"location":{"en":"Tokushima","ja":"Tokushima"},"description":{"en":"This paper deals with the bifurcation of the periodic solution and the generation of chaotic states of the solution for Duffing-Rayleigh equation. We calculate bifurcation diagram under both of increasing and decreasing time and calculate stable and unstable manifolds. From these analysis, we explain the generation of crisis.","ja":"This paper deals with the bifurcation of the periodic solution and the generation of chaotic states of the solution for Duffing-Rayleigh equation. We calculate bifurcation diagram under both of increasing and decreasing time and calculate stable and unstable manifolds. From these analysis, we explain the generation of crisis."},"is_international_presentation":true},"priority":"input_data"} line:90, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797950"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=162609","label":"url"}],"presentation_title":{"en":"Bifurcation Structure of Capacitive Coupled BVP","ja":"Bifurcation Structure of Capacitive Coupled BVP"},"presenters":{"en":[{"name":"Nishiuchi, Yusuke"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"Nishiuchi, Yusuke"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Proc. NDES2007","ja":"Proc. NDES2007"},"publication_date":"2007-07-26","languages":["eng"],"location":{"en":"Tokushima","ja":"Tokushima"},"description":{"en":"We have investigated a variety of coupled two oscillators. In previous reports, we explained many bifurcation structures of coupling types when two BVP oscillators are connected by linear resistor. In this report we investigate a bifurcation structure, when two BVP oscillators are connected by capacitor. Additionally, each current Port of oscillators is connected. This system becomes five-dimensional autonomous system unlike other coupling. We illustrate attractors and bifurcation phenomena of this system, and we compare bifurcation structures of coupled oscillators.","ja":"We have investigated a variety of coupled two oscillators. In previous reports, we explained many bifurcation structures of coupling types when two BVP oscillators are connected by linear resistor. In this report we investigate a bifurcation structure, when two BVP oscillators are connected by capacitor. Additionally, each current Port of oscillators is connected. This system becomes five-dimensional autonomous system unlike other coupling. We illustrate attractors and bifurcation phenomena of this system, and we compare bifurcation structures of coupled oscillators."},"is_international_presentation":true},"priority":"input_data"} line:91, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797951"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=162608","label":"url"}],"presentation_title":{"en":"On Scicos simulation of a hybrid dynamical system","ja":"On Scicos simulation of a hybrid dynamical system"},"presenters":{"en":[{"name":"Bouzahir, Hassane"},{"name":"Guezar, Fatima El"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Bouzahir, Hassane"},{"name":"Guezar, Fatima El"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NDES2007","ja":"Proc. NDES2007"},"publication_date":"2007-07-26","languages":["eng"],"location":{"en":"Tokushima","ja":"Tokushima"},"description":{"en":"This paper reports on a numerical study of an example of piecewise linear systems that constitute a class of hybrid systems. Precisely, we study the dynamics of the current-programmed boost converter circuit in an open-loop. Our modeling techniques are based on the new French native modeler and simulator for hybrid systems called Scicos (Scilab Connected Object Simulator) which is a Scilab (Scientific Laboratory) package. Scicos provides a much clearer understanding of the way the model will behave during simulation reducing considerably the risk of ambiguity. Taking into account the hybrid nature of the circuit is also a new approach in this paper.","ja":"This paper reports on a numerical study of an example of piecewise linear systems that constitute a class of hybrid systems. Precisely, we study the dynamics of the current-programmed boost converter circuit in an open-loop. Our modeling techniques are based on the new French native modeler and simulator for hybrid systems called Scicos (Scilab Connected Object Simulator) which is a Scilab (Scientific Laboratory) package. Scicos provides a much clearer understanding of the way the model will behave during simulation reducing considerably the risk of ambiguity. Taking into account the hybrid nature of the circuit is also a new approach in this paper."},"is_international_presentation":true},"priority":"input_data"} line:92, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797952"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=162606","label":"url"}],"presentation_title":{"en":"Method of repellers detection by applied computation over basin of attraction","ja":"Method of repellers detection by applied computation over basin of attraction"},"presenters":{"en":[{"name":"Brandon, Quentin"},{"name":"Kumano, Toshiyuki"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Brandon, Quentin"},{"name":"Kumano, Toshiyuki"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NDES2007","ja":"Proc. NDES2007"},"publication_date":"2007-07-26","languages":["eng"],"location":{"en":"Tokushima","ja":"Tokushima"},"description":{"en":"This paper proposes a new visualization method for chaotic attractors and detection of repellers in the basin of attraction of discrete nonlinear dynamical systems. Conventionally it is expressed by plotting the solution orbit into a plane as a set of dots. In the case of color figures, a pixel is usually colored based on the location of the orbit, hitting statistics, and so on. In some other approaches, a pixel is colored by n-time map direction. This method is called directional coloring. However, it requires much time to calculate both the solution and the n-time map direction. We use an argument defined by a current orbit and an n-time mapped point is used for coloring in initial plane. This method can decrease the computation time, and can render a direction map where all solutions within the range arbitrarily specified. This method can visualize repeller as well as directional coloring. The position of repellers can be detected by automatically setting up the candidate point based on visualized repellers.","ja":"This paper proposes a new visualization method for chaotic attractors and detection of repellers in the basin of attraction of discrete nonlinear dynamical systems. Conventionally it is expressed by plotting the solution orbit into a plane as a set of dots. In the case of color figures, a pixel is usually colored based on the location of the orbit, hitting statistics, and so on. In some other approaches, a pixel is colored by n-time map direction. This method is called directional coloring. However, it requires much time to calculate both the solution and the n-time map direction. We use an argument defined by a current orbit and an n-time mapped point is used for coloring in initial plane. This method can decrease the computation time, and can render a direction map where all solutions within the range arbitrarily specified. This method can visualize repeller as well as directional coloring. The position of repellers can be detected by automatically setting up the candidate point based on visualized repellers."},"is_international_presentation":true},"priority":"input_data"} line:93, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797953"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=151647","label":"url"}],"presentation_title":{"en":"Occasional Delayed Feedback Control for Switched Autonomous Systems","ja":"Occasional Delayed Feedback Control for Switched Autonomous Systems"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kousaka Takuji"},{"name":"Tsuji Shigeki"}],"ja":[{"name":"上田 哲史"},{"name":"高坂 拓司"},{"name":"辻 繁樹"}]},"event":{"en":"Proc. of ISCAS2007","ja":"Proc. of ISCAS2007"},"publication_date":"2007-05-29","languages":["eng"],"location":{"en":"New Orleans","ja":"New Orleans"},"description":{"en":"We propose the occasional delayed feedback control for chaotic circuits with interrupt characteristics. The control input generated by the difference between the current state and the delayed state is added to the system occasionally, i.e., during a certain interval defined by the switching policy. This control is reasonable for chaotic systems including some switches since they are not always feasible to admit the control input, e.g., a fixed control input terminal may be separated according to the switching action. We apply the control method to a chaotic switched circuit and demonstarate availability by some numerical experiments.","ja":"We propose the occasional delayed feedback control for chaotic circuits with interrupt characteristics. The control input generated by the difference between the current state and the delayed state is added to the system occasionally, i.e., during a certain interval defined by the switching policy. This control is reasonable for chaotic systems including some switches since they are not always feasible to admit the control input, e.g., a fixed control input terminal may be separated according to the switching action. We apply the control method to a chaotic switched circuit and demonstarate availability by some numerical experiments."},"is_international_presentation":true},"priority":"input_data"} line:94, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797954"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=147878","label":"url"}],"presentation_title":{"en":"e-Syllabus System Supporting the Discovery of Learning Paths","ja":"e-Syllabus System Supporting the Discovery of Learning Paths"},"presenters":{"en":[{"name":"Miyoshi Yasuo"},{"name":"Oie Takahiro"},{"name":"Kawakami Hiroshi"},{"name":"Ueta Tetsushi"},{"name":"Yano Yoneo"}],"ja":[{"name":"三好 康夫"},{"name":"大家 隆弘"},{"name":"川上 博"},{"name":"上田 哲史"},{"name":"矢野 米雄"}]},"event":{"en":"Proceedings of E-Learn 2006","ja":"Proceedings of E-Learn 2006"},"publication_date":"2006-10-13","languages":["eng"],"promoter":{"en":"Association for the Advancement of Computing in Education","ja":"Association for the Advancement of Computing in Education"},"location":{"en":"Honolulu","ja":"Honolulu"},"description":{"en":"We have developed an e-Syllabus system that represents graphically and dynamically the relationships between lectures. This development represents one of the improvements of infrastructure for education and learning. In order to construct the e-Syllabus, three new columns have been added to each lecture of the syllabus: keywords, preceding lectures and relational lectures. XML is used as a storage format; it allows us to represent the structured data within on a text file that can be stored on a CD-ROM. Thus, without accessing the web, it is possible to represent graphically and discover the relations between the lectures. This representation of the syllabus supports the students in the discovery of learning-paths and the definition of learning plan. Thus, the e-Syllabus system improves the convenience of using the syllabus.","ja":"We have developed an e-Syllabus system that represents graphically and dynamically the relationships between lectures. This development represents one of the improvements of infrastructure for education and learning. In order to construct the e-Syllabus, three new columns have been added to each lecture of the syllabus: keywords, preceding lectures and relational lectures. XML is used as a storage format; it allows us to represent the structured data within on a text file that can be stored on a CD-ROM. Thus, without accessing the web, it is possible to represent graphically and discover the relations between the lectures. This representation of the syllabus supports the students in the discovery of learning-paths and the definition of learning plan. Thus, the e-Syllabus system improves the convenience of using the syllabus."},"is_international_presentation":true},"priority":"input_data"} line:95, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797955"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145437","label":"url"}],"presentation_title":{"en":"Dependence of Synchronous Activities in Coupled Inhibitory Neurons upon Excitability Classes","ja":"Dependence of Synchronous Activities in Coupled Inhibitory Neurons upon Excitability Classes"},"presenters":{"en":[{"name":"Tsuji Shigeki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"辻 繁樹"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"合原 一幸"}]},"event":{"en":"Proc. of NOLTA2006","ja":"Proc. of NOLTA2006"},"publication_date":"2006-09-13","languages":["eng"],"location":{"en":"Bologna, Italy","ja":"Bologna, Italy"},"is_international_presentation":true},"priority":"input_data"} line:96, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797956"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145436","label":"url"}],"presentation_title":{"en":"Classification and Analytical Method of Switched Dynamical Systems","ja":"Classification and Analytical Method of Switched Dynamical Systems"},"presenters":{"en":[{"name":"MA YUE"},{"name":"Banerjee, Soumitro"},{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"馬 躍"},{"name":"Banerjee, Soumitro"},{"name":"高坂 拓司"},{"name":"上田 哲史"}]},"event":{"en":"Proc. of NOLTA2006","ja":"Proc. of NOLTA2006"},"publication_date":"2006-09-12","languages":["eng"],"location":{"en":"Bologna, Italy","ja":"Bologna, Italy"},"is_international_presentation":true},"priority":"input_data"} line:97, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797957"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=143557","label":"url"}],"presentation_title":{"en":"Mutual evaluation of presentation skills between two distant universities by giga-bit network","ja":"Mutual evaluation of presentation skills between two distant universities by giga-bit network"},"presenters":{"en":[{"name":"Kusaka Kazuya"},{"name":"Hanabusa Takao"},{"name":"Kiriyama Satoshi"},{"name":"Ueta Tetsushi"},{"name":"Tsuneda Akio"},{"name":"Nagamachi Takuo"}],"ja":[{"name":"日下 一也"},{"name":"英 崇夫"},{"name":"桐山 聰"},{"name":"上田 哲史"},{"name":"常田 明夫"},{"name":"長町 拓夫"}]},"event":{"en":"Abstract of 6th Asian-Pacific Conference on PBL","ja":"Abstract of 6th Asian-Pacific Conference on PBL"},"publication_date":"2006-05-27","languages":["eng"],"promoter":{"en":"Department of Medical Education, Tokyo Women's Medical University, School of Medicine","ja":"Department of Medical Education, Tokyo Women's Medical University, School of Medicine"},"location":{"en":"Tokyo","ja":"Tokyo"},"is_international_presentation":true},"priority":"input_data"} line:98, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797958"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145435","label":"url"}],"presentation_title":{"en":"Switch Synchronizing Delayed Feedback Control for Piecewise Linear Systems","ja":"Switch Synchronizing Delayed Feedback Control for Piecewise Linear Systems"},"presenters":{"en":[{"name":"Toyosaki, Yu"},{"name":"Ueta Tetsushi"},{"name":"Kousaka Takuji"}],"ja":[{"name":"Toyosaki, Yu"},{"name":"上田 哲史"},{"name":"高坂 拓司"}]},"event":{"en":"Proc. of ISCAS2006","ja":"Proc. of ISCAS2006"},"publication_date":"2006-05-23","languages":["eng"],"location":{"en":"Island of Kos, Greece","ja":"Island of Kos, Greece"},"is_international_presentation":true},"priority":"input_data"} line:99, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797959"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145434","label":"url"}],"presentation_title":{"en":"Pattern Emergence in Strange Attractor by Directions of Mappings","ja":"Pattern Emergence in Strange Attractor by Directions of Mappings"},"presenters":{"en":[{"name":"Kumano, Toshiyuki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"Kumano, Toshiyuki"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Proc. of ISCAS2006","ja":"Proc. of ISCAS2006"},"publication_date":"2006-05-23","languages":["eng"],"location":{"en":"Island of Kos, Greece","ja":"Island of Kos, Greece"},"description":{"en":"This paper proposes a new visualization method to given chaotic attractors in discrete nonlinear dynamical systems. Conventionally it is expressed by plotting the solution orbit into a plane as a set of dots. In the case of color figures, a pixel is colored by the location of the orbit, histogram of hitting, and so on. We use an argument defined by a current orbit and an n-time mapped point is utilized for coloring. This can depict orientation or tendency of the orbit within the chaotic attractor. In this visualization process, an remarkable pattern emergence phenomenon is observed. We illustrate these color figures and discuss similarity to basins of attraction.","ja":"This paper proposes a new visualization method to given chaotic attractors in discrete nonlinear dynamical systems. Conventionally it is expressed by plotting the solution orbit into a plane as a set of dots. In the case of color figures, a pixel is colored by the location of the orbit, histogram of hitting, and so on. We use an argument defined by a current orbit and an n-time mapped point is utilized for coloring. This can depict orientation or tendency of the orbit within the chaotic attractor. In this visualization process, an remarkable pattern emergence phenomenon is observed. We illustrate these color figures and discuss similarity to basins of attraction."},"is_international_presentation":true},"priority":"input_data"} line:100, {"insert":{"user_id":"1000039004","type":"presentations","id":"31797960"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=138542","label":"url"}],"presentation_title":{"en":"Bifurcations of periodic solutions in the forced genetic toggle switch system","ja":"Bifurcations of periodic solutions in the forced genetic toggle switch system"},"presenters":{"en":[{"name":"Shiotsu, Kimiyasu"},{"name":"Kobayashi, Tetsuya"},{"name":"Ueta Tetsushi"},{"name":"Tsuji, Shigeki"},{"name":"Aihara Kazuyuki"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"Shiotsu, Kimiyasu"},{"name":"Kobayashi, Tetsuya"},{"name":"上田 哲史"},{"name":"Tsuji, Shigeki"},{"name":"合原 一幸"},{"name":"川上 博"}]},"event":{"en":"Proc. of NCSP2006","ja":"Proc. of 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line:236, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798075"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=288998","label":"url"}],"presentation_title":{"en":"Event information sharing system utilizing personal schedule data","ja":"スケジューリングを鑑みたイベント情報共有システム"},"presenters":{"en":[{"name":"Nakayashiki Yoshihiro"},{"name":"Ueta Tetsushi"},{"name":"Sano Masahiko"},{"name":"Matsuura Kenji"}],"ja":[{"name":"中屋敷 義浩"},{"name":"上田 哲史"},{"name":"佐野 雅彦"},{"name":"松浦 健二"}]},"event":{"en":"Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related 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line:237, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798076"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=288997","label":"url"}],"presentation_title":{"en":"Demand Forecast of Computer Terminals by Time Series Analysis","ja":"時系列分析手法を用いた端末利用予報"},"presenters":{"en":[{"name":"Ogata Yuichi"},{"name":"Ueta Tetsushi"},{"name":"Matsuura Kenji"},{"name":"Sano Masahiko"}],"ja":[{"name":"尾方 裕一"},{"name":"上田 哲史"},{"name":"松浦 健二"},{"name":"佐野 雅彦"}]},"event":{"en":"Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related 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Kazuyuki"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"伊藤 大輔"},{"name":"大津 智弘"},{"name":"藤本 憲市"},{"name":"上田 哲史"},{"name":"合原 一幸"},{"name":"吉永 哲哉"}]},"event":{"en":"Proceedings of 1st Multi Symposium on Control Systems","ja":"第1回制御部門マルチシンポジウム資料"},"publication_date":"2014-03-04","languages":["jpn"],"promoter":{"en":"The Society of Instrument and Control Engineers","ja":"計測自動制御学会"},"location":{"en":"Tokyo","ja":"東京"},"description":{"en":"Topological properties of the limit set are characterized by the Lyapunov exponent of the orbit on the dynamical system. In discrete-time dynamical system is described by ordinary differential equations, authors translate avoidance of bifurcations controlling problem of a stable fixed point, periodic point into minimization problem that the evaluation function the maximum Lyapunov exponent. The authors had proposed the controller to avoid the unbeseeming bifurcation phenomena that is caused by the variation of system parameters by change in environment. We have reported results that it is applied to the period- doubling bifurcation of the periodic point on the H enon map. In this paper, avoidance of bifurcations method is applied to the Kawakami map. We confirm that the controller can avoid the tangent bifurcation and Neimark-Sacker bifurcation.","ja":"Topological properties of the limit set are characterized by the Lyapunov exponent of the orbit on the dynamical system. In discrete-time dynamical system is described by ordinary differential equations, authors translate avoidance of bifurcations controlling problem of a stable fixed point, periodic point into minimization problem that the evaluation function the maximum Lyapunov exponent. The authors had proposed the controller to avoid the unbeseeming bifurcation phenomena that is caused by the variation of system parameters by change in environment. We have reported results that it is applied to the period- doubling bifurcation of the periodic point on the H enon map. In this paper, avoidance of bifurcations method is applied to the Kawakami map. We confirm that the controller can avoid the tangent bifurcation and Neimark-Sacker bifurcation."},"is_international_presentation":false},"priority":"input_data"} line:242, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798081"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=274223","label":"url"}],"presentation_title":{"en":"Avoidance of Bifurcations of Stable Fixed Point Using the Maximum Lyapunov Exponent","ja":"最大リアプノフ指数による安定固定点の分岐回避"},"presenters":{"en":[{"name":"Otsu, Tomohiro"},{"name":"Fujimoto Ken'ichi"},{"name":"Ueta Tetsushi"},{"name":"Aihara Kazuyuki"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"大津 智弘"},{"name":"藤本 憲市"},{"name":"上田 哲史"},{"name":"合原 一幸"},{"name":"吉永 哲哉"}]},"event":{"en":"Proceedings of the 2014 IEICE General Conference","ja":"電子情報通信学会2014年総合大会講演論文集"},"publication_date":"2014-03-04","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication 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{"insert":{"user_id":"1000039004","type":"presentations","id":"31798208"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145156","label":"url"}],"presentation_title":{"en":"準回転運動を行なう力学系の解析","ja":"準回転運動を行なう力学系の解析"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers","ja":"電気関係学会四国支部連合大会講演論文集"},"publication_date":"1992-10","languages":["jpn"],"is_international_presentation":false},"priority":"input_data"} line:370, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798209"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145155","label":"url"}],"presentation_title":{"en":"振動センサを利用した旋回型クレーンの振動制御","ja":"振動センサを利用した旋回型クレーンの振動制御"},"presenters":{"en":[{"name":"Tanaka Yoshio"},{"name":"Tanaka, Masato"},{"name":"Yoshida, Yasuo"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"田中 芳夫"},{"name":"田中 正人"},{"name":"吉田 靖夫"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers","ja":"電気関係学会四国支部連合大会講演論文集"},"publication_date":"1991-10","languages":["jpn"],"is_international_presentation":false},"priority":"input_data"} line:371, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798210"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145154","label":"url"}],"presentation_title":{"en":"クレーンの吊り荷揺れと揺れのパラメトリック制御","ja":"クレーンの吊り荷揺れと揺れのパラメトリック制御"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Tanaka Yoshio"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"田中 芳夫"},{"name":"川上 博"}]},"event":{"en":"Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related 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Kazumasa"},{"name":"Shibuya, Kiyoo"},{"name":"Yoshida, Taku"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"今井 一雅"},{"name":"渋谷 清雄"},{"name":"吉田 拓"},{"name":"上田 哲史"}]},"event":{"en":"Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers","ja":"電気関係学会四国支部連合大会講演論文集"},"publication_date":"1987-10","languages":["jpn"],"is_international_presentation":false},"priority":"input_data"} line:375, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798214"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145150","label":"url"}],"presentation_title":{"en":"パソコンLANによる地球観測衛星ランドサット 画像データ処理システムの開発","ja":"パソコンLANによる地球観測衛星ランドサット 画像データ処理システムの開発"},"presenters":{"en":[{"name":"Imai, Kazumasa"},{"name":"Ueta Tetsushi"},{"name":"Okamoto, Kozin"}],"ja":[{"name":"今井 一雅"},{"name":"上田 哲史"},{"name":"岡本 公仁"}]},"event":{"en":"Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers","ja":"電気関係学会四国支部連合大会講演論文集"},"publication_date":"1987-10","languages":["jpn"],"is_international_presentation":false},"priority":"input_data"} line:376, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798215"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145149","label":"url"}],"presentation_title":{"en":"16ビットパソコンによる地球観測衛星ランドサット 画像データ処理システムの開発","ja":"16ビットパソコンによる地球観測衛星ランドサット 画像データ処理システムの開発"},"presenters":{"en":[{"name":"Imai, Kazumasa"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"今井 一雅"},{"name":"上田 哲史"}]},"event":{"en":"Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers","ja":"電気関係学会四国支部連合大会講演論文集"},"publication_date":"1986-10","languages":["jpn"],"is_international_presentation":false},"priority":"input_data"} line:377, {"insert":{"user_id":"1000039004","type":"presentations","id":"45320437"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=404800","label":"url"}],"presentation_title":{"en":"Visualization of a 2-dimensionally stable manifold of an equilibrium in 3 dimensional autonomous system","ja":"3 次元自律系における2 次元平衡点安定多様体の視覚化"},"presenters":{"en":[{"name":"Ryuto ISHIGAKI"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"石垣 龍人"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2024-01-25","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Naruto","ja":"鳴門"},"description":{"en":"In various field such engineering and biology, to analyze systems, people have been analyzing them by buildingmodels. In this paper, I visualize 2-dimensionally stable manifold. Target is saddle of 3 dimensional autonomous system.Stable manifold is separatrix. So, it is basin boundary of attraction and gives us basin of attraction in state space. That is why Icalculate stable manifold. If a manifold is one dimension, all you need is to chase orbits that depart from eigen vector of saddlefor plus or minus time. But, if it is two dimensions, you have to approximate with a curved surface. In this paper, I explainmethod that is referenced by previous research. And I visualize 3 autonomous systems, Lorenz equation, Chens equation, andequation of S. Dadras et al.","ja":"工学や生物学など様々な分野で系を解析するために，数理モデルを構築して解析が行われてきた．本稿で 行うのは，2 次元安定多様体の可視化である．まず，対象は3 次元自律系のサドル型平衡点である．なぜその安定多 様体を求めるかというと，それはセパラトリックスなので，アトラクタの引力圏境を与えるからであり，状態空間中 のアトラクタの棲み分け図を求めることができるからである．1 次元多様体であれば，サドルの固有ベクトルから出 発する軌道を正時間または逆時間で追跡すればよいが，2 次元多様体の場合，面で近似する必要がある．本稿では先 行研究を参考にした実験手法を説明し，3 つの3 次元自律系，Lorenz 方程式，Chen の方程式，そしてS. Dadras らの 方程式の安定多様体を可視化する．"},"is_international_presentation":false},"priority":"input_data"} line:378, {"insert":{"user_id":"1000039004","type":"presentations","id":"45320438"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=404796","label":"url"}],"presentation_title":{"en":"Canard Cycles in Multivibrators with Piece-wise Constant Identical Operational Amplifier","ja":"区分定数特性をもつ理想オペアンプを用いた マルチバイブレータのカナール解"},"presenters":{"en":[{"name":"Amoh Seiya"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"天羽 晟矢"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2024-01-25","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"鳴門市","ja":"鳴門市"},"description":{"en":"The multi-vibrator is an electronic circuit with multiple stable states, often built using operational amplifiers. Thereare three types of stable states: unstable, monostable, and bistable, and transitions between these modes can be achievedthrough parameter changes. Conventionally, the output response of multi-vibrators is considered a hybrid system. In thisstudy, we similarly configure the system as a hybrid system by modeling the amplification characteristics of the operationalamplifier as piecewise constant or piecewise linear characteristics. Furthermore, the system is constructed as a time-delayeddynamical system by considering the first-order delay characteristics of the operational amplifier. During the transition fromthe monostable state to the unstable state, a unique solution specific to slowfast dynamical systems, canard, is observed.","ja":"マルチバイブレータは複数の安定状態を持つ電子回路であり，しばしばオペアンプを用いて構成される． 安定状態には無安定，単安定，双安定の3 種類があり，これらのモード間はパラメタ変化によって変更が可能である． 従来，マルチバイブレータの出力応答はハイブリッドシステムとして捉えられているが，本研究では同様に，オペア ンプの増幅特性を区分定数または区分線形特性として設定することでハイブリッドシステムとして系を構成する．ま た，系はオペアンプの一次遅れ特性を考慮することにより遅速力学系として構成され，単安定状態から無安定状態へ の変遷時にカナールと呼ばれる遅速力学系特有の解が観測される．"},"is_international_presentation":false},"priority":"input_data"} line:379, {"insert":{"user_id":"1000039004","type":"presentations","id":"45320439"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=404799","label":"url"}],"presentation_title":{"en":"Bifurcation of three Wilson-Cowan neuron models","ja":"3 個のWilson-Cowan ニューロンモデルの分岐"},"presenters":{"en":[{"name":"Yoshikawa, Masaki"},{"name":"Amoh Seiya"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"吉川 聖輝"},{"name":"天羽 晟矢"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2024-01-24","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Naruto","ja":"鳴門"},"description":{"en":"In recent years, there has been a lot of interest in analyzing the activity between neurons by schematizing neuronalmodels. In this study, we numerically analyze and discuss a three-dimensional Wilson-cowan neuron model. The generaltwo-dimensionalWilson-cowan model reproduces simple responses between neurons by assuming one group of excitatory andone group of inhibitory neurons. In this study, we performed numerical experiments using the general Wilson-Cowan modelwith one excitatory neuron group. The results showed that the local branching structure changed as the excitatory neuronsvalue fluctuated. The stability of the equilibrium point also supports the global stability proposed by Hoppensteadt et al.","ja":"近年，ニューロンモデルを模式化してニューロン間の活動を解析することが盛んに行われている．本研究 では三次元Wilson-cowan ニューロンモデルの数値的解析とその考察を行なった．一般的な二次元Wilosn-cowan は， 興奮性と抑制性のニューロン群を1 つずつ仮定することでニューロン同士の単純な応答を再現している．本研究では 一般的なWilson-Cowan モデルに興奮性のニューロン群を1 つ加えて数値実験を実施した．その結果，興奮性ニュー ロンの値が変動することで局所的な分岐構造の変化が確認された．また，平衡点の安定性についてもHoppensteadt ら が提唱した大域的な安定性を裏付ける形となっている．"},"is_international_presentation":false},"priority":"input_data"} line:380, {"insert":{"user_id":"1000039004","type":"presentations","id":"45320440"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=404797","label":"url"}],"presentation_title":{"en":"On inverse-time responses and bifurcations in 2-dimensional non-autonomus","ja":"2 次元非自律系の逆時間応答・分岐について"},"presenters":{"en":[{"name":"Katayama MICHIRU"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"片山 充二"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2024-01-24","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"鳴門市","ja":"鳴門市"},"description":{"en":"A dynamical system represented by the signal response of an electric circuit is expressed as a non-autonomoussystem. Some non-autonomous systems have strange attractors in their phase space, and their bifurcation structures are of greatinterest in chaos theory. In this paper, we consider the transformation to analyze bifurcation structures. The Poincar´emap of the periodic solution has a fixed point, which is a condition for non-hyperbolicity, in common with the forward andbackward time systems, and the stability of the fixed points is interchanged. As an example, we perform numerical analysis offorward and backward time systems in a two-dimensional non-autonomous electrical circuit. As a result, we confirmed that theparameter regime that corresponds to the divergent regime in the forward time system can sometimes be observed as a periodicsolution in the backward time system. We also report that there are strange attractors in the phase space of the backward timesystem that cannot be seen in the forward time direction.","ja":"周期的な外力によって駆動される非自律系は，周期的な信号を受け取る電気回路の信号応答に代表される 力学系を記述するモデルである．非自律系は非線形力学系特有の現象であるカオスを引き起こす場合があるため，そ の分岐構造はカオス理論の研究において関心が高く，現在においても盛んに研究されている分野の一つとなっている． 本論文では，分岐構造へのアプローチとして，逆時間𝑡 → -𝑡 による分析を行う．順時間系における周期解のPoincar´e 写像について，非双曲性の条件となる固定点は逆時間系と共通しており，順時間系と逆時間系で固定点の安定性が入 れ替わる．実例として，2 次元非自律系の電気回路にて，逆時間方向の数値解析を行う．結果として， N 順時間方向 で発散領域に該当するパラメータ領域は，逆時間系では周期解として観測できる場合があることを確認した．また， 特定のモデルにおいて，順時間方向では確認できないカオスが存在することを報告する．"},"is_international_presentation":false},"priority":"input_data"} line:381, {"insert":{"user_id":"1000039004","type":"presentations","id":"42803113"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=398309","label":"url"}],"presentation_title":{"en":"Bifurcation analysis and simulation of a biological switch model","ja":"生物スイッチの数理モデルにおける分岐現象解析とシミュレーション"},"presenters":{"en":[{"name":"QUANKAI ZHANG"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"張 全凱"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2023-06-09","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Tokyo","ja":"東京"},"description":{"en":"Using a mathematical model of biological switches, we examine the phenomenon of cell differentiation under a cyclic external force as a circadian rhythm. In order to understand the differentiation state of cells with different parameters in the mathematical model, a bifurcation analysis of the periodic solution is investigated, and the topological classification of the periodic solution is performed by means of a bifurcation diagram. We also show that a period-doubling cascade chain occurs, resulting in different states of Delta concentration, or differentiation, in the cell. The response of the mathematical model under a cyclic external force as a circadian rhythm is investigated by computer simulations. In the bistable region, the attraction regions are separated from each other by a high potential, and the amplitude of a cyclic external force as a circadian rhythm cannot merge the attraction regions with each other, indicating that the switch structure does not collapse.","ja":"生物スイッチの数理モデルを用いて，周期外力下の細胞分化現象を検討する．数理モデル上，異なるパラ メータで細胞の概日周期入力に応答する分化状態を把握するために周期解の分岐解析を行い，分岐図によって周期解 の位相的分類を行う．周期倍分岐連鎖が発生し，細胞内のDelta 濃度，いわゆる分化が異なる状態になることも示す． 計算機を用いてシミュレーションを行い，周期外力下の数理モデルの応答について検討を行った．また，双安定領域 では互いの吸引領域は高いポテンシャルで隔てられており，周期外力の振幅では互いの吸引領域を合併することは出 来ず，スイッチ構造は崩れないことが分かった．"},"is_international_presentation":false},"priority":"input_data"} line:382, {"insert":{"user_id":"1000039004","type":"presentations","id":"42803114"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=398308","label":"url"}],"presentation_title":{"en":"Multivibrator as Slow-fast Dynamics --- Canard Explosion and its Circuit Response","ja":"遅速力学系としてのマルチバイブレータ --- カナール爆発現象とその回路応答"},"presenters":{"en":[{"name":"Amoh Seiya"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"天羽 晟矢"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2023-06-09","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Tokyo","ja":"東京"},"description":{"en":"Intermittency gives the irregular switching of almost periodic (laminar) and chaotic (burst) motions, and can be confirmed in every physical system within a certain parameter range. In this paper, by utilizing a method stabilizing a periodic motion which have been vanished by a saddle node bifurcation, a laminar motion in the intermittency is stabilized by a tiny control input. A pseudo periodic orbit composed by the vanished orbit or laminar motion is applied as a reference for the linear feedback control. We demonstrate the control for a circuit model and show robust stabilization responses.","ja":"間欠性カオスにおいては，ほぼ周期的な運動(ラミナー部) とカオス的な運動(バースト部) が不規則に切り 替えられている．間欠性カオスの存在するパラメータ付近に存在する，ラミナー部と同じ周期の周期解におけるサド ルノード分岐は，ラミナーの生成の直接的原因となり，かつ，ラミナー運動への初期値吸引能力を保存する仕組みと もなっている．そこで我々は，接線分岐前の周期解時系列を擬似周期軌道としてメモリに記録し，間欠性カオス状態 に，ラミナー運動と疑似周期軌道との誤差をフィードバックすることで，ごく少ない制御入力によりラミナー運動を 周期解へと安定化する．回路モデルに対してこの制御法を適用し，ロバストな制御結果を得た．"},"is_international_presentation":false},"priority":"input_data"} line:383, {"insert":{"user_id":"1000039004","type":"presentations","id":"42803115"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=398307","label":"url"}],"presentation_title":{"en":"Laminar stabilization control in chaos intermittency","ja":"間欠性カオスにおけるラミナー安定化制御"},"presenters":{"en":[{"name":"Katayama MICHIRU"},{"name":"Ikeda Kenji"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"片山 充二"},{"name":"池田 建司"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2023-06-09","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Tokyo","ja":"東京"},"description":{"en":"Intermittency gives the irregular switching of almost periodic (laminar) and chaotic (burst) motions, and can be confirmed in every physical system within a certain parameter range. In this paper, by utilizing a method stabilizing a periodic motion which have been vanished by a saddle node bifurcation, a laminar motion in the intermittency is stabilized by a tiny control input. A pseudo periodic orbit composed by the vanished orbit or laminar motion is applied as a reference for the linear feedback control. We demonstrate the control for a circuit model and show robust stabilization responses.","ja":"間欠性カオスにおいては，ほぼ周期的な運動(ラミナー部) とカオス的な運動(バースト部) が不規則に切り 替えられている．間欠性カオスの存在するパラメータ付近に存在する，ラミナー部と同じ周期の周期解におけるサド ルノード分岐は，ラミナーの生成の直接的原因となり，かつ，ラミナー運動への初期値吸引能力を保存する仕組みと もなっている．そこで我々は，接線分岐前の周期解時系列を擬似周期軌道としてメモリに記録し，間欠性カオス状態 に，ラミナー運動と疑似周期軌道との誤差をフィードバックすることで，ごく少ない制御入力によりラミナー運動を 周期解へと安定化する．回路モデルに対してこの制御法を適用し，ロバストな制御結果を得た．"},"is_international_presentation":false},"priority":"input_data"} line:384, {"insert":{"user_id":"1000039004","type":"presentations","id":"41746771"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=394493","label":"url"}],"presentation_title":{"en":"2 リンクロボットにおける大域的分岐","ja":"2 リンクロボットにおける大域的分岐"},"presenters":{"en":[{"name":"Yamaguchi Rikiya"},{"name":"Ito Daisuke"},{"name":"Miino Yuu"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"山口 力也"},{"name":"伊藤 大輔"},{"name":"美井野 優"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2023-03-15","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Online","ja":"オンライン"},"description":{"en":"A two-link robot is modeled as a four-dimensional autonomous system, and its motion is chaotic. The global motion of the robot starts from an unstable manifold near a saddle equilibrium point and is separated by a homoclinic orbit connecting to its own saddle equilibrium point. In this study, we analyze and observe homoclinic orbits in a system where friction and constant torque are applied to the joints of the robot.","ja":"2 関節ロボットは4 次元の自律系とモデル化され，その運動はカオス的である．ロボットの大域的な運動 は，サドル型平衡点付近の不安定多様体から出発し，自身のサドル型平衡点へと繋がるホモクリニック軌道によって 隔てられる．本研究では，ロボットの関節に摩擦と定値トルクを印加した系におけるホモクリニック軌道について解 析と観察を行う．"},"is_international_presentation":false},"priority":"input_data"} line:385, {"insert":{"user_id":"1000039004","type":"presentations","id":"41746772"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=394492","label":"url"}],"presentation_title":{"en":"A scenario obtaining periodic solutions from third-order autonomous system without equilibrium points","ja":"平衡点のない3 次元自律系にみられる周期解とその発生シナリオ"},"presenters":{"en":[{"name":"Yoshida, Ryuichi"},{"name":"Amoh Seiya"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"吉田 隆一"},{"name":"天羽 晟矢"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2023-03-15","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Online","ja":"オンライン"},"description":{"en":"The generation of periodic solutions is one example of a bifurcation in an autonomous system. Usually, periodic solutions are generated by a Hopf bifurcation at an equilibrium point. In this paper, we focus on a system with periodic solutions but no equilibrium point, and explore the mechanism by which periodic solutions are generated. In one scenario, a Hopf bifurcation was confirmed by adding a new parameter to the system, and the mechanism of the periodic solution was found. For the desired unstable complex conjugate root in the characteristic equation We will consider adding a parameter to generate a Hopf bifurcation for the desired unstable complex conjugate roots in the characteristic equation. Therefore, this paper presents an example of adding a parameter to generate a Hopf bifurcation in a system without equilibrium. Key words no equilibrium points, bifurcation analysis","ja":"自律系の分岐として，周期解の発生は1 つの例である．通常，周期解は平衡点のHopf 分岐により発生す る．本稿では，平衡点は存在しないが周期解がある系を取り上げ，その周期解が発生する機序を探求する．一つのシ ナリオとして，系に新たにパラメータを追加することでHopf 分岐を確認し，周期解の発生機序について知見が得ら れた．特性方程式上で目的とした不安定な複素共役根に対し，Hopf 分岐を発生させるようパラメータの追加を検討す る．従って，本稿では平衡のない系において，Hopf 分岐を発生させるパラメータを追加した例を示す．"},"is_international_presentation":false},"priority":"input_data"} line:386, {"insert":{"user_id":"1000039004","type":"presentations","id":"41505522"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=394064","label":"url"}],"presentation_title":{"en":"Revisit on Computations for Bifurcation Problems --- A follow-up","ja":"分岐問題再考 --- 続報"},"presenters":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2023-01-28","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Hakodate","ja":"函館"},"description":{"en":"Python is gaining attention as a fundamental programming language for machine learning and data science. This report describes a detailed Python approach to nonlinear problems, especially the bifurcation problems of periodic solutions. It is a highly readable implementation of the bifurcation algorithm, independent from the computer and the operating system, and it allows an interactive trial-and-error processing. We describe advantages of Python for bifurcation problems with some illustrated codes.","ja":"機械学習やデータサイエンスを実践する基盤プログラミング言語としてPython が注目されている．本稿では非線形問題，特に系にみられる周期解の分岐問題について，Python を用いたアプローチの詳細を述べる．分岐計算アルゴリズムを可読性高く実装でき，計算機やOS に依存せず，対話処理による試行錯誤が可能となる．いくつかの特徴的なコードを示しながら，分岐問題に対するPython の優位点を述べる．"},"is_international_presentation":false},"priority":"input_data"} line:387, {"insert":{"user_id":"1000039004","type":"presentations","id":"37168378"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=385936","label":"url"}],"presentation_title":{"en":"Multivibrator and Slow-fast Dynamics --- Basic bifurcation phenomena and Canard solutions","ja":"遅速力学系としてのマルチバイブレータ --- 基本的な分岐現象とカナール解"},"presenters":{"en":[{"name":"Amoh, Seiya"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"天羽 晟矢"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2022-06-10","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Toyonaka","ja":"豊中"},"description":{"en":"Slow-fast dynamical systems are systems of ordinary differential equations involving different time constants. Systems with slow-fast characteristics may have a characteristic solution called the Canard solution. The evolution of the solution depending on the parameter change is interesting. In this paper, we treat a multivibrator, which is a slow-fast dynamical system that can be easily implemented as an electronic circuit. If the operational amplifiers of the multivibrator have dynamic output characteristics, the system behaves as a slow dynamics system. We investigate the basic bifurcation phenomena that occur at the equilibrium point and the process of generating Canard solutions.","ja":"遅速力学系は，常微分方程式のうち異なる時定数を含む系である．遅速特性を持つ系ではカナール解と呼 ばれる特徴的な解が発生する場合があるが，その解のパラメタ変化に依る変遷は非常に興味深い．本研究では電子回路 として容易に実装できる遅速力学系であるマルチバイブレータを扱う．マルチバイブレータの構成要素であるオペア ンプの出力特性を動的特性とすると，その時定数が特異接道パラメタの役割を果たし典型的な遅速力学系の振る舞い をみせる．マルチバイブレータを遅速力学系として捉えた際の系に発生する平衡点の基本的な分岐現象から，カナー ル解発生に至るまでのシナリオを検討する．"},"is_international_presentation":false},"priority":"input_data"} line:388, {"insert":{"user_id":"1000039004","type":"presentations","id":"36393555"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=384344","label":"url"}],"presentation_title":{"en":"Revisit on Computations for Bifurcation Problems","ja":"分岐問題再考"},"presenters":{"en":[{"name":"Ueta Tetsushi"}],"ja":[{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2021-12-10","invited":true,"languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Oita","ja":"大分"},"description":{"en":"We are developing a bifurcation analysis tool written by Python. In this computer language, reliable functions which have been imported from FORTRAN implementation are available. Variational equations and related derivatives are expressed simply without loops. A GUI required for interactive operation is also provided by matplotlib. The tool can be OS independent. We introduce the tool in detail and discuss further development and prospects.","ja":"Python で分岐問題計算ツールを開発している．FORTRAN 由来の信頼性の高い関数が利用でき，変分方程式の表現も簡潔となる．また，Python のみで，分岐解析に必要な対話的処理が実現され，OS に依存しない．講演ではツールの詳細や，今後の展望や問題点などを述べる．"},"is_international_presentation":false},"priority":"input_data"} line:389, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798216"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=363110","label":"url"}],"presentation_title":{"en":"Quantitative Measurement and Analysis to Thinking as a Way of Programming for Elementary School in Japan","ja":"小学生のプログラミング的思考力の定量的測定とその分析"},"presenters":{"en":[{"name":"Yano Rina"},{"name":"Tanioka Hiroki"},{"name":"Matsuura Kenji"},{"name":"Sano Masahiko"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"矢野 里奈"},{"name":"谷岡 広樹"},{"name":"松浦 健二"},{"name":"佐野 雅彦"},{"name":"上田 哲史"}]},"event":{"en":"IPSJ SIG Technical Report","ja":"情報処理学会研究報告"},"publication_date":"2020-03-10","languages":["jpn"],"promoter":{"en":"Information Processing Society of Japan","ja":"情報処理学会"},"location":{"en":"Kobe","ja":"神戸"},"description":{"en":"Programming education will be compulsory in elementary schools in Japan from 2020, but thereis still little information on how to measure the effects of lessons conducted for students. In this study, inorder to objectively and quantitatively measure the educational effect of programming education, we developed a test of measuring an ability of thinking as a way of programming. In this paper, we evaluate themeasurability of the test using the Fishers exact test for elementary school students answers, focusing onthe grade, the programming experience, and the difference between the results before and after the workshop.","ja":"2020 年度より小学校ではプログラミング教育が必修化されるが，小学校で実施される授業が生徒に どのような教育効果を及ぼすのか，その測定手法に関する情報は未だ少ない．本研究では，プログラミン グ教育の教育効果を客観的・定量的に測定するため，プログラミング的思考力を測定する問題を開発し， 徳島県内のプログラミングワークショップで，参加者の小学生のプログラミング的思考力を測定すること を試みた．本稿では，その測定結果について，学年やプログラミングの経験，ワークショップの前後での 結果の差などに注目して考察を行い，開発した問題の有効性を評価する．"},"is_international_presentation":false},"priority":"input_data"} line:390, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798217"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=359892","label":"url"}],"presentation_title":{"en":"馬蹄型写像の同定とカオス制御","ja":"馬蹄型写像の同定とカオス制御"},"presenters":{"en":[{"name":"Miyazaki, Shohei"},{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"宮崎 章平"},{"name":"美井野 優"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2019-09-24","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Kochi","ja":"高知"},"description":{"en":"1 つのサドル型固定点から伸びる安定多様体と不安定多様体の交わりであるホモクリニック点が存在する とき，馬蹄形写像が存在している．馬蹄形写像内部には可算無限個の不安定周期点が存在しており，ホモクリニック 点をNewton 法の初期値として任意周期の不安定周期点を計算することができる．本研究では，導出した不安定周期 点を用いたExternal Force Control で馬蹄形写像内部の不安定周期点を制御することを目的とする．","ja":"1 つのサドル型固定点から伸びる安定多様体と不安定多様体の交わりであるホモクリニック点が存在する とき，馬蹄形写像が存在している．馬蹄形写像内部には可算無限個の不安定周期点が存在しており，ホモクリニック 点をNewton 法の初期値として任意周期の不安定周期点を計算することができる．本研究では，導出した不安定周期 点を用いたExternal Force Control で馬蹄形写像内部の不安定周期点を制御することを目的とする．"},"is_international_presentation":false},"priority":"input_data"} line:391, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798218"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=359893","label":"url"}],"presentation_title":{"en":"記号力学系に基づいたlogistic map における不安定周期点の数値的導出法","ja":"記号力学系に基づいたlogistic map における不安定周期点の数値的導出法"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"美井野 優"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2019-09-23","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Kochi","ja":"高知"},"description":{"en":"本研究では，logistic map に対応する記号力学系を基に，カオス中に埋め込まれた不安定周期点(unstable periodic point; UPP) を算出する数値的手法を提案する．logistic map を逆写像に持つ2 つの写像を定義することで，時 間過去方向の解軌道に自由度をもたせ，所望の記号列に対応したUPP を導出する．1 から6 の周期を持つ周期点及び 10-周期点，20-周期点に対して数値実験を行い，手法の有効性を示す．また，計算の収束性を示す指標を導入し，提 案手法の適用可能性も吟味する．","ja":"本研究では，logistic map に対応する記号力学系を基に，カオス中に埋め込まれた不安定周期点(unstable periodic point; UPP) を算出する数値的手法を提案する．logistic map を逆写像に持つ2 つの写像を定義することで，時 間過去方向の解軌道に自由度をもたせ，所望の記号列に対応したUPP を導出する．1 から6 の周期を持つ周期点及び 10-周期点，20-周期点に対して数値実験を行い，手法の有効性を示す．また，計算の収束性を示す指標を導入し，提 案手法の適用可能性も吟味する．"},"is_international_presentation":false},"priority":"input_data"} line:392, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798219"},"force":{"see_also":[{"@id":"http://id.nii.ac.jp/1001/00194833/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=349965","label":"url"}],"presentation_title":{"en":"Improving Animal Recognition Accuracy using De-fencing","ja":"遮蔽物除去による動物認識の精度向上"},"presenters":{"en":[{"name":"Kohei Kawanaka"},{"name":"Felicia Misamanana Rabarison"},{"name":"Tanioka Hiroki"},{"name":"Ohira Kenji"},{"name":"Sano Masahiko"},{"name":"Matsuura Kenji"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"川中 康平"},{"name":"Felicia Misamanana Rabarison"},{"name":"谷岡 広樹"},{"name":"大平 健司"},{"name":"佐野 雅彦"},{"name":"松浦 健二"},{"name":"上田 哲史"}]},"event":{"en":"IPSJ SIG Technical Report","ja":"情報処理学会研究報告"},"publication_date":"2019-03-02","languages":["jpn"],"promoter":{"en":"Information Processing Society of Japan","ja":"情報処理学会"},"location":{"en":"北海道","ja":"北海道"},"description":{"en":"When a computer recognizes an animal on an image, an accuracy of animal recognition decreases if a part of the animal's body is covered by fences. On the other hand, when a human recognizes a object on the image, it is known to be possible to remove and supplement the fences, and recognize the object, even if a part of the object is covered by fences. In this research, we aim to improve the accuracy of animal recognition using de-fencing on computer.","ja":"コンピュータで画像情報を用いて動物認識を行う際，対象となる動物の体の一部が檻などの遮蔽物に隠れ，動物認識の精度が低下する場合がある．一方，人間が視覚情報を用いて物体を認識する際，物体の一部が檻などの遮蔽物に隠れていても，遮蔽物を除去，補完し，物体を認識できることが知られている．そこで本研究では，コンピュータで画像から檻を除去することによる動物認識の精度向上を目指す．"},"is_international_presentation":false},"priority":"input_data"} line:393, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798220"},"force":{"see_also":[{"@id":"https://www.ieice.org/ken/paper/20190228P1jz/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=349964","label":"url"}],"presentation_title":{"en":"Local Zoo Guide Application using Image Recognition","ja":"Local Zoo Guide Application using Image Recognition"},"presenters":{"en":[{"name":"Rabarison Misamanana Felicia"},{"name":"Kawanaka Kohei"},{"name":"Tanioka Hiroki"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Rabarison Felicia Misamanana"},{"name":"川中 康平"},{"name":"谷岡 広樹"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"IEICE Technical Report"},"publication_date":"2019-02-21","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Tokushima","ja":"Tokushima"},"description":{"en":"Most of the information for guide in the Tokushima zoo is in Japanese. However, it is difficult to understand Japanese guide for foreign tourists. Therefore, we need to develop an animal guide application or robot without language query for foreign visitors. One of the ideas is that Convolutional Neural Network (CNN) is employed for image recognition for making image query on the application. The application is available to display instantly information about animals in an image or video. For our experiment, pictures including 30 kinds of animals are collected. Around 4,000 pictures were taken from Tokushima zoo for the purpose of this experiments.","ja":"Most of the information for guide in the Tokushima zoo is in Japanese. However, it is difficult to understand Japanese guide for foreign tourists. Therefore, we need to develop an animal guide application or robot without language query for foreign visitors. One of the ideas is that Convolutional Neural Network (CNN) is employed for image recognition for making image query on the application. The application is available to display instantly information about animals in an image or video. For our experiment, pictures including 30 kinds of animals are collected. Around 4,000 pictures were taken from Tokushima zoo for the purpose of this experiments."},"is_international_presentation":false},"priority":"input_data"} line:394, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798221"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=347047","label":"url"}],"presentation_title":{"en":"Report for Learning Email Etiquette in Group","ja":"グループ学習による電子メールの利用マナーの向上"},"presenters":{"en":[{"name":"Tanioka Hiroki"},{"name":"Matsuura Kenji"},{"name":"Ueta Tetsushi"},{"name":"Kawano Fumiaki"}],"ja":[{"name":"谷岡 広樹"},{"name":"松浦 健二"},{"name":"上田 哲史"},{"name":"河野 文昭"}]},"event":{"en":"JSiSE Resaeach Report","ja":"教育システム情報学会研究報告"},"publication_date":"2018-10-27","languages":["jpn"],"promoter":{"en":"Japanese Society for Information and Systems in Education","ja":"教育システム情報学会"},"location":{"en":"Tokushima","ja":"徳島"},"is_international_presentation":false},"priority":"input_data"} line:395, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798222"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=345351","label":"url"}],"presentation_title":{"en":"エノン写像における馬蹄形写像のホモクリニック点と不安定周期点との位置関係","ja":"エノン写像における馬蹄形写像のホモクリニック点と不安定周期点との位置関係"},"presenters":{"en":[{"name":"Miyazaki, Shohei"},{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"宮崎 章平"},{"name":"美井野 優"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2018-08-09","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Matsuyama","ja":"松山"},"description":{"en":"馬蹄形写像内部の不安定周期点をあるホモクリニック点の座標情報を用いて計算する手法が開発されてい る．しかし，両者の位置的関係についての調査は未だ行われていなかった．本研究では，馬蹄形写像に埋め込まれた 不安定周期点を6周期点まで算出し，これらと算出に用いるホモクリニック点との位置関係を調査する．Hénon 写像 を例に取り，ホモクリニック点及び周期点は数値的に導出し，極座標形式による座標評価を行う．","ja":"馬蹄形写像内部の不安定周期点をあるホモクリニック点の座標情報を用いて計算する手法が開発されてい る．しかし，両者の位置的関係についての調査は未だ行われていなかった．本研究では，馬蹄形写像に埋め込まれた 不安定周期点を6周期点まで算出し，これらと算出に用いるホモクリニック点との位置関係を調査する．Hénon 写像 を例に取り，ホモクリニック点及び周期点は数値的に導出し，極座標形式による座標評価を行う．"},"is_international_presentation":false},"priority":"input_data"} line:396, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798223"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=345350","label":"url"}],"presentation_title":{"en":"船舶転覆問題にみられる分岐現象","ja":"船舶転覆問題にみられる分岐現象"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Maki, Atsuo"},{"name":"Umeda, Naoya"}],"ja":[{"name":"美井野 優"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"牧 敦夫"},{"name":"梅田 直哉"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2018-08-08","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Matsuyama","ja":"松山"},"description":{"en":"船舶の運動安定性の分野においては，船舶転覆問題を議論するために軟化型Duffing 方程式が用いられる． しかしながら，軟化型Duffing 方程式を扱う多くの研究は近似的解法を用いており，実際の物理系の振る舞いにそぐ わない結果を導くことも少なくない．本報では，非線形分野で古くから発展してきた数値的解法を用いて，軟化型 Duffing 方程式を解析する．適切なPoincaré 写像を定義し，系で観測される周期解の安定性や安定・不安定多様体を導 出し，局所または大域分岐について議論する．結果として，系の二次元パラメタ空間における分岐構造を明らかにし， 分岐現象が状態空間のベイスンに及ぼす影響について議論する．","ja":"船舶の運動安定性の分野においては，船舶転覆問題を議論するために軟化型Duffing 方程式が用いられる． しかしながら，軟化型Duffing 方程式を扱う多くの研究は近似的解法を用いており，実際の物理系の振る舞いにそぐ わない結果を導くことも少なくない．本報では，非線形分野で古くから発展してきた数値的解法を用いて，軟化型 Duffing 方程式を解析する．適切なPoincaré 写像を定義し，系で観測される周期解の安定性や安定・不安定多様体を導 出し，局所または大域分岐について議論する．結果として，系の二次元パラメタ空間における分岐構造を明らかにし， 分岐現象が状態空間のベイスンに及ぼす影響について議論する．"},"is_international_presentation":false},"priority":"input_data"} line:397, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798224"},"force":{"see_also":[{"@id":"https://www.ipsj.or.jp/kenkyukai/event/mps119.html","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=341737","label":"url"}],"presentation_title":{"en":"Evaluating Hitting Skills of NPB Players with Logistic Regression Analysis","ja":"Evaluating Hitting Skills of NPB Players with Logistic Regression Analysis"},"presenters":{"en":[{"name":"Sakai Mamoru"},{"name":"Tanioka Hiroki"},{"name":"Matsuura Kenji"},{"name":"Sano Masahiko"},{"name":"Ohira Kenji"},{"name":"Ueta Tetsushi"},{"name":"Hiroaki Sakaguchi"}],"ja":[{"name":"坂井 衛"},{"name":"谷岡 広樹"},{"name":"松浦 健二"},{"name":"佐野 雅彦"},{"name":"大平 健司"},{"name":"上田 哲史"},{"name":"坂口 裕昭"}]},"event":{"en":"IPSJ SIG Technical Report","ja":"IPSJ SIG Technical Report"},"publication_date":"2018-07-30","languages":["eng"],"promoter":{"en":"Information Processing Society of Japan","ja":"Information Processing Society of Japan"},"location":{"en":"Las Vegas","ja":"Las Vegas"},"description":{"en":"When we watch a baseball game, we often witness scenes that a line drive flies out in front of a fielder. On the other hand, a pop fly falls between infielders and outfielders. In such a scene, we viewers express unlucky or lucky for the batter. Therefore, luck is supposed to be existing in baseball. In other words, it is hard to say that hitting records depend on only the ability of the batters. In this paper, lucky or unlucky is occurred in unpredictable cases with human eyes. Hence, we consider that luck exists in a phenomenon beyond observers expected based on their observable information.","ja":"When we watch a baseball game, we often witness scenes that a line drive flies out in front of a fielder. On the other hand, a pop fly falls between infielders and outfielders. In such a scene, we viewers express unlucky or lucky for the batter. Therefore, luck is supposed to be existing in baseball. In other words, it is hard to say that hitting records depend on only the ability of the batters. In this paper, lucky or unlucky is occurred in unpredictable cases with human eyes. Hence, we consider that luck exists in a phenomenon beyond observers expected based on their observable information."},"is_international_presentation":false},"priority":"input_data"} line:398, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798225"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=336748","label":"url"}],"presentation_title":{"en":"A Meeting Recording System Concidered for Utilization","ja":"利活用を考慮したゼミ議事録蓄積システム"},"presenters":{"en":[{"name":"Hiramatsu Takao"},{"name":"Sano Masahiko"},{"name":"Matsuura Kenji"},{"name":"Ohira Kenji"},{"name":"Tanioka Hiroki"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"平松 孝雄"},{"name":"佐野 雅彦"},{"name":"松浦 健二"},{"name":"大平 健司"},{"name":"谷岡 広樹"},{"name":"上田 哲史"}]},"event":{"en":"IPSJ SIG Technical Report","ja":"情報処理学会研究報告"},"publication_date":"2018-03-21","languages":["jpn"],"location":{"en":"Kyoto","ja":"京都"},"description":{"en":"蓄積されたゼミ議事録や研究成果物が有効に利活用されていない問題に対して，それらの利活用や関連情報の再検索における手間の低減を目的とした手法を提案する．提案手法では，ゼミ議事録にメタデータを付与しながらの作成と，関連研究成果物との連携により，利活用する際の手間の低減を図る．本稿では，その提案手法とその実験システムの開発状況について述べる．","ja":"蓄積されたゼミ議事録や研究成果物が有効に利活用されていない問題に対して，それらの利活用や関連情報の再検索における手間の低減を目的とした手法を提案する．提案手法では，ゼミ議事録にメタデータを付与しながらの作成と，関連研究成果物との連携により，利活用する際の手間の低減を図る．本稿では，その提案手法とその実験システムの開発状況について述べる．"},"is_international_presentation":false},"priority":"input_data"} line:399, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798226"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=336744","label":"url"}],"presentation_title":{"en":"Support System for Laboratory Selection using Researchers Database","ja":"研究成果DBを利用した希望研究室選択支援"},"presenters":{"en":[{"name":"Okada Kana"},{"name":"Sano Masahiko"},{"name":"Matsuura Kenji"},{"name":"Ohira Kenji"},{"name":"Tanioka 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The parameter regulation to avoid bifurcations is derived from an optimization problem on the maximum local Lyapunov exponent and the method of steepest descent. This method allows us to predict occurrence of bifurcations caused by unexpected parameter change and to avoid it without directly analyzing bifurcations in advance. In this report, on the basis of the ideas and a stroboscopic mapping that discretizes the trajectory of a continuous-time solution, we propose a methodology to avoid bifurcations of stable periodic oscillations in continuous-time non-autonomous dynamical systems. We also demonstrate that the proposed method can avoid bifurcations of stable periodic solutions in Duffing equation.","ja":"著者らは，動的システムにみられる極限集合の位相的性質が解軌道のリアプノフ指数によって特徴付けられることに着目し，離散時間力学系における安定な固定点や周期点の分岐を回避するためのパラメータ制御法を提案している．この制御法は，最大局所リアプノフ指数に基づく評価関数の最適化問題と最急降下法から導出され，解の分岐集合を事前に解析することなく，システムパラメータの変化による分岐の発生を予測し回避できるという特長を有する．本報告では，離散時間力学系に対する分岐回避制御法のアイデアを基に，連続時間力学系における解軌道を離散化するためのストロボ写像を用いて，連続時間非自律系における安定周期解に対する分岐回避制御法を提案する．提案法の有効性を例証するため，Duffing方程式における安定周期振動の分岐回避実験結果についても報告する．"},"is_international_presentation":false},"priority":"input_data"} line:418, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798245"},"force":{"see_also":[{"@id":"http://www.ieice.org/ken/paper/20141017CBrr/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=295388","label":"url"}],"presentation_title":{"en":"非線形結合における同期特性","ja":"非線形結合における同期特性"},"presenters":{"en":[{"name":"Hishikawa, Kenji"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"菱川 健治"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2014-10-16","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Matsuyama","ja":"松山"},"is_international_presentation":false},"priority":"input_data"} line:419, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798246"},"force":{"see_also":[{"@id":"http://www.ieice.org/ken/paper/20141017kBr7/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=295387","label":"url"}],"presentation_title":{"en":"外力を印加した結合ニューロンモデルの応答","ja":"外力を印加した結合ニューロンモデルの応答"},"presenters":{"en":[{"name":"Miino, Yuu"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"美井野 優"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2014-10-16","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Matsuyama","ja":"松山"},"is_international_presentation":false},"priority":"input_data"} line:420, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798247"},"force":{"see_also":[{"@id":"http://www.ieice.org/ken/paper/20141017LBrr/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=286261","label":"url"}],"presentation_title":{"en":"疑似周期軌道を用いたカオス制御とその実装","ja":"疑似周期軌道を用いたカオス制御とその実装"},"presenters":{"en":[{"name":"Mano, Shota"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"間野 翔大"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2014-10-16","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Matsuyama","ja":"松山"},"is_international_presentation":false},"priority":"input_data"} line:421, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798248"},"force":{"see_also":[{"@id":"http://www.ieice.org/ken/paper/20141017EBrs/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=296513","label":"url"}],"presentation_title":{"en":"ネットワークルータの輻輳制御における分岐現象の解析","ja":"ネットワークルータの輻輳制御における分岐現象の解析"},"presenters":{"en":[{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2014-10-09","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Matsuyama","ja":"松山"},"description":{"en":"ランダム初期検知を用いた転送制御は TCP 通信における輻輳制御問題で重要な手法であり,数理モデル としてモデル化する研究もなされている.それらのモデルにおいて,カオスや分岐現象といった,非線形力学系固有 の現象が観測された.本報告では,離散時間モデルである S-モデルを対象に分岐構造を調査する.","ja":"ランダム初期検知を用いた転送制御は TCP 通信における輻輳制御問題で重要な手法であり,数理モデル としてモデル化する研究もなされている.それらのモデルにおいて,カオスや分岐現象といった,非線形力学系固有 の現象が観測された.本報告では,離散時間モデルである S-モデルを対象に分岐構造を調査する."},"is_international_presentation":false},"priority":"input_data"} line:422, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798249"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=286107","label":"url"}],"presentation_title":{"en":"Development and practical use of GakuNin application system at Tokushima University","ja":"徳島大学における学認利用申請システムの開発と運用"},"presenters":{"en":[{"name":"Seki Yosuke"},{"name":"Matsuura Kenji"},{"name":"Ueta Tetsushi"},{"name":"Sano Masahiko"}],"ja":[{"name":"関 陽介"},{"name":"松浦 健二"},{"name":"上田 哲史"},{"name":"佐野 雅彦"}]},"event":{"en":"第18回学術情報処理研究集会発表論文集","ja":"第18回学術情報処理研究集会発表論文集"},"publication_date":"2014-09-25","languages":["jpn"],"promoter":{"en":"国立大学法人情報系センター協議会","ja":"国立大学法人情報系センター協議会"},"location":{"en":"松本市，長野県","ja":"松本市，長野県"},"is_international_presentation":false},"priority":"input_data"} line:423, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798250"},"force":{"see_also":[{"@id":"http://www.ieice.org/ken/paper/201310298B6l/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=273417","label":"url"}],"presentation_title":{"en":"Emergent Control of Pseudo Periodic Orbits in Chaotic Dynamical Systems","ja":"Emergent Control of Pseudo Periodic Orbits in Chaotic Dynamical Systems"},"presenters":{"en":[{"name":"Mano Shota"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"間野 翔大"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"IEICE Technical Report"},"publication_date":"2013-12-06","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Hong Kong","ja":"Hong Kong"},"is_international_presentation":false},"priority":"input_data"} line:424, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798251"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/110009821833/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1520853834200712192/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=273416","label":"url"}],"presentation_title":{"en":"An analysis of bursting oscillations in a 4D autonomous system","ja":"4次元自律系のバースト発振の解析"},"presenters":{"en":[{"name":"Inaba, Jumpei"},{"name":"NIshiuchi Yusuke"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"稲葉 純平"},{"name":"西内 悠祐"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2013-10-29","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Takamatsu","ja":"高松"},"description":{"en":"Bursting oscillations are important in considering the behavior of neuron,the mathematical models are devised variously.And bursting oscillations are realized by a coupling or applying an external periodic forcing to the system,however,what can be implemented easily in actual circuit is not many. In the studying for the BVP oscillator for generating a quasi-periodic, we were able to propose the bursting oscillator of 4-dimensional autonomous system. whose number of components is small and be easy to implement.In this paper, we showed periodic orbits, quasi-periodic orbits, and let compared with the responses of the actual circuit and numerical simulations on how to change burst oscillations are dependent on the parameters. Next we analyzed the bifurcation of periodic solutions, and characterized the topological properties of the bursting oscillations.","ja":"バースト発振は神経細胞の振る舞いを考える上で重要であり,これまでに様々な数理モデルが構築されて きた.しかし電気回路で容易に実現できるモデルは少なく,複数の発振器を組み合わせたり,系に周期外力を印加す ることでバースト発振が実現されている.われわれは準周期を発生させる BVP 発振器について研究する過程におい て,4 次元自律系のバースト発振器を構成できた.構成素子点数も少なく,実装が容易である.本報告では,この力学 系における,バースト発振がパラメータに依存してどのように変化するのかを周期軌道,準周期軌道,ならびに数値 シミュレーションと実回路上の応答と対比させて示す.また周期解の分岐解析を行い,バースト発振の位相的性質を 特徴付けた."},"is_international_presentation":false},"priority":"input_data"} line:425, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798252"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=273418","label":"url"}],"presentation_title":{"en":"Characteristics of bifurcations and oscillations in coupled BVP oscillators","ja":"BVP発振器の結合方式による分岐と発振状態の特徴"},"presenters":{"en":[{"name":"NIshiuchi Yusuke"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"西内 悠祐"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2013-10-28","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Takamatsu","ja":"高松"},"description":{"en":"BVP 発振器は単純な回路構成で発振状態を観測できる有名な非線形モデルである．BVP 発振器は二つの状態変数に関係したポートを持つため，二つの同一 BVP 振器を結合する場合でも，結合方式の違う結合発振器が複数存在する．これらの結合発振器のうち，基本的なものは既に研究されているが，非線形特性や正規化手法が違うため，その結果を単純に比較し特徴を求めることはできない．そこで，本研究では基本的な結合方式について，同一条件で平衡点やリミットサイクルの分岐，同期発振の状態を調べ，結合方式による特徴を明らかにする．","ja":"BVP 発振器は単純な回路構成で発振状態を観測できる有名な非線形モデルである．BVP 発振器は二つの状態変数に関係したポートを持つため，二つの同一 BVP 振器を結合する場合でも，結合方式の違う結合発振器が複数存在する．これらの結合発振器のうち，基本的なものは既に研究されているが，非線形特性や正規化手法が違うため，その結果を単純に比較し特徴を求めることはできない．そこで，本研究では基本的な結合方式について，同一条件で平衡点やリミットサイクルの分岐，同期発振の状態を調べ，結合方式による特徴を明らかにする．"},"is_international_presentation":false},"priority":"input_data"} line:426, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798253"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=258747","label":"url"}],"presentation_title":{"en":"On compensation of attractors vanished by tangent bifurcation","ja":"接線分岐により消滅するアトラクタを補償する制御について"},"presenters":{"en":[{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Tsuji Shigeki"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"辻 繁樹"},{"name":"合原 一幸"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2012-11-12","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Ishinomaki","ja":"石巻"},"is_international_presentation":false},"priority":"input_data"} line:427, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798254"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=257854","label":"url"}],"presentation_title":{"en":"Evaluation and comparison of controlling costs on controlling chaos","ja":"カオス制御における制御コストの評価と比較"},"presenters":{"en":[{"name":"Fujimoto Ken'ichi"},{"name":"Otsu Tomohiro"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"藤本 憲市"},{"name":"大津 智弘"},{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"吉永 哲哉"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2012-11-12","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Ishinomaki","ja":"石巻"},"description":{"en":"OGY and delayed-feedback methods proposed at the beginning of 1990s are well known as the original methods of controlling chaos. One of the authors et al. also proposed a method of controlling chaos using Poincare map and linear control theory. All the methods can stabilize unstable periodic motions by making small perturbations of available system parameters. However, from the viewpoint of controlling energy needed to stabilize such motions, to evaluate the amount of required parameter perturbations has not been reported as far as the authors know. In this report, using three indices based on state variables, control input, and electric power (i.e. energy), we evaluated controlling costs to stabilize an unstable periodic motion observed in a continuous-time dynamical system such that the amount of parameter perturbations can be converted to electric power.","ja":"OGY法や遅延フィードバック法は，1990年代初めに提案された代表的なカオス制御法である．その後，著者の一人らも，ポアンカレ写像と線形制御理論に基づいたカオス制御法を提案している．極配置問題の観点からみれば，この制御法は，不安定な極のみを操作するOGY 法を拡張したものになっている．いずれの手法もシステムパラメータの摂動により不安定周期解を安定化することができるが，著者らの知る限り安定化に要するパラメータ摂動量を制御エネルギとして評価した報告は見当たらない．本報告では，パラメータ摂動量を制御エネルギ(電力)に換算できる発振器回路を対象とし，状態変数，制御入力，電力それぞれに基づいた指標に基づいて，線形制御理論に基づくカオス制御法と遅延フィードバック法における制御コストを評価した．"},"is_international_presentation":false},"priority":"input_data"} line:428, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798255"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=257292","label":"url"}],"presentation_title":{"en":"Numerical validation for blurred basin of symmetric equilibria in a 3D autonomous system","ja":"3次元自律系の対称平衡点に関するベイスン崩壊の数値検証"},"presenters":{"en":[{"name":"Inaba, Jumpei"},{"name":"Nishiuchi, Yusuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"稲葉 純平"},{"name":"西内 悠祐"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2012-09-21","languages":["jpn"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Kochi","ja":"高知"},"is_international_presentation":false},"priority":"input_data"} line:429, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798256"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/110009626136/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1520009408783062528/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=253418","label":"url"}],"presentation_title":{"en":"Experimental Confirmation of Controlling Chaos Utilizing the Threshold","ja":"しきい値の摂動を用いたカオス制御の実験的検討"},"presenters":{"en":[{"name":"Yamamoto, Yoshihiko"},{"name":"Asahara, Hiroyuki"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Aihara Kazuyuki"},{"name":"Kousaka Takuji"}],"ja":[{"name":"山本 吉彦"},{"name":"麻原 寛之"},{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"合原 一幸"},{"name":"高坂 拓司"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2012-07-05","languages":["jpn"],"promoter":{"en":"The Institute of Electronics, Information and Communication Engineers","ja":"一般社団法人電子情報通信学会"},"location":{"en":"Kagoshima","ja":"鹿児島"},"description":{"en":"Controlling chaos has attracted considerable attention, and many researchers have proposed the controlling methods. In recent years, a controlling method that focused on the threshold in the composite dynamical system has been proposed. Although its effectiveness was confirmed, the experimental verification is insufficient. In this paper, we experimentally confirm of controlling chaos in an interrupted electric circuit by adding the controlling signal into the threshold. First, we explain the circuit model and basic behavior of the waveform. Next, we show the design of the controller. Finally, we confirm the controlling method based on the experimental results.","ja":"カオス制御は古くから盛んに研究されており,様々な制御手法の提案や実験的検討が行われている.近年,断続動作特性を有する合成力学系において,しきい値に制御入力を加えることによりカオスアトラクタを内在する不安定周期軌道へと安定化させる新たな制御手法が提案され,その有効性が理論的に確認された.しかし,実験系における理論の検証は未だ不十分である.本稿では,先に提案された制御手法を状態・時刻混合型断続回路に適用し,実験的な視点から理論の正当性を確認する.まず,回路モデルとその基本的なスイッチング動作について説明する.次に,制御系の構成について説明する.最後に,シミュレーションおよび回路実装を行い,実験系においてもしきい値を用いたカオス制御が可能であることを示す."},"is_international_presentation":false},"priority":"input_data"} line:430, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798257"},"force":{"see_also":[{"@id":"http://id.ndl.go.jp/bib/023871689","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1520572356992237824/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=253415","label":"url"}],"presentation_title":{"en":"Controlling Chaos by linear prediction and data lists","ja":"線形予測とリストを用いたカオス制御"},"presenters":{"en":[{"name":"Miyaji, Yusuke"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"宮地 佑典"},{"name":"伊藤 大輔"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2012-07-05","languages":["jpn"],"promoter":{"en":"The Institute of Electronics, Information and Communication Engineers","ja":"電子情報通信学会"},"location":{"en":"Kagoshima","ja":"鹿児島"},"description":{"en":"In this study, we propose a chaos controlling with a linear prediction and lists. A linear prediction model is the technique that can predict the future state of systems by using past states. It is suitable for the prediction of time series. We apply this for a chaos controlling, and propose the chaos controlling by using prediction value. However, a linear prediction model is ruled unfit to predict of nonlinear systems like chaos. Thus, in highly non-linearity systems, the prediction accuracy become diminished and performance of controller negatively affect. So, The return value of target systems is kept as lists and list data is used for the controlling in highly non-linearity region. By this way, even if the systems has highly non-linearity, our controller can be stabilized from chaos, and can be improved the performance.","ja":"本報告は，線形予測モデルと入出力のデータリストを用いた状態予測カオス制御法を提案する． 線形予測モデルは将来の値をそれまでの時系列データより線形写像として予測する手法であり，線形確率過程から生成される時系列の予測に非常に適している．この手法をカオス制御に応用し，予測値を用いたカオス制御を実現する．しかし，線形 予測モデルはカオスのような非線形システムから生成される時系列を予測するのに適していない．つまり，非線形性の強い時系列予測では予測精度が著しく低下し，制御性能に影響を及ぼす．そこで，入出力の組み合わせデータをリストとして保存しておき，非線形性の強い部分ではリストを用いて状態予測する．これにより，非線形性の強い部分においても精度よく未来の状態を予測することができ，制御性能の向上が期待できる．"},"is_international_presentation":false},"priority":"input_data"} line:431, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798258"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=248329","label":"url"}],"presentation_title":{"en":"コントラストの高い白黒二値画像に対するフラクタル符号の重みについて","ja":"コントラストの高い白黒二値画像に対するフラクタル符号の重みについて"},"presenters":{"en":[{"name":"Kitano, Yoshinori"},{"name":"Ueta Tetsushi"},{"name":"Nishio Yoshifumi"},{"name":"Guoan Yang"},{"name":"Yang Yang"}],"ja":[{"name":"北野 圭則"},{"name":"上田 哲史"},{"name":"西尾 芳文"},{"name":"楊 国安"},{"name":"楊 暘"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2012-04-19","languages":["jpn"],"location":{"en":"Ise","ja":"伊勢"},"is_international_presentation":false},"priority":"input_data"} line:432, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798259"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=253857","label":"url"}],"presentation_title":{"en":"組織評価とISMS","ja":"組織評価とISMS"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Sano Masahiko"}],"ja":[{"name":"上田 哲史"},{"name":"佐野 雅彦"}]},"event":{"en":"IPSJ SIG Technical Report","ja":"情報処理学会研究報告"},"publication_date":"2012-03-15","languages":["jpn"],"location":{"en":"Sapporo","ja":"札幌"},"description":{"en":"徳島大学情報化推進センターでは，ISMS 導入にむけ，2011 年度当初から準備を始 め，最終的に2012 年1 月に認証機関より適合判定を受けた．ISMS 取得は，並行し て行われた新コンピュータシステム調達(2012 年3 月稼働予定)との2 大事業であ り，クラウド導入に関するデータセンターの利用，SLA 締結におけるセキュリティ要 件の管理において重要な役割を果たす．時期を同じくして本センターは組織評価(外 部評価)を受審したが，評価資料における組織，人的セキュリティ，経営陣の責任等 の体制構築，情報セキュリティ対策および関連プロジェクトなど各種取り組みの情報 はISMS 受審には大いに役立った．情報セキュリティ関係業務は本センターの主業務 であるため，ISMS をターゲットに取りまとめた資料は，組織評価資料の作成に多い に貢献した．本稿では情報系センターの組織評価におけるISMS の価値や必要性と， 大学における情報マネジメントの関係について述べる．","ja":"徳島大学情報化推進センターでは，ISMS 導入にむけ，2011 年度当初から準備を始 め，最終的に2012 年1 月に認証機関より適合判定を受けた．ISMS 取得は，並行し て行われた新コンピュータシステム調達(2012 年3 月稼働予定)との2 大事業であ り，クラウド導入に関するデータセンターの利用，SLA 締結におけるセキュリティ要 件の管理において重要な役割を果たす．時期を同じくして本センターは組織評価(外 部評価)を受審したが，評価資料における組織，人的セキュリティ，経営陣の責任等 の体制構築，情報セキュリティ対策および関連プロジェクトなど各種取り組みの情報 はISMS 受審には大いに役立った．情報セキュリティ関係業務は本センターの主業務 であるため，ISMS をターゲットに取りまとめた資料は，組織評価資料の作成に多い に貢献した．本稿では情報系センターの組織評価におけるISMS の価値や必要性と， 大学における情報マネジメントの関係について述べる．"},"is_international_presentation":false},"priority":"input_data"} line:433, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798260"},"force":{"see_also":[{"@id":"http://ci.nii.ac.jp/naid/110009481361/","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1520572357095635328/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=248328","label":"url"}],"presentation_title":{"en":"周期外力を加えた電子ホタルにおける分岐と同期現象","ja":"周期外力を加えた電子ホタルにおける分岐と同期現象"},"presenters":{"en":[{"name":"Ito Daisuke"},{"name":"Tsuji Akinori"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"伊藤 大輔"},{"name":"辻 明典"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2012-01-22","languages":["jpn"],"promoter":{"en":"The Institute of Electronics, Information and Communication Engineers","ja":"一般社団法人電子情報通信学会"},"location":{"en":"会津若松","ja":"会津若松"},"description":{"en":"Cooperative or conjoint action of creatures with autonomous oscillation can be considered as synchronization phenomena which are one of typical nonlinear dynamic properties. For example, there are a group singing of crickets, self-organized light synchronizations of fireflies and so on. Especially, fireflies can be modeled as optically coupled oscillators(OCOs) by using LEDs and photo interruptor. Synchronization phenomena of a couple of these oscillators were already investigated, however, synchronization of the single oscillator is not discussed. In this study, we model the firefly as OCO, and add the periodic external force input for one.","ja":"コオロギの合唱やホタルの集団発行等，自律発振する生体の協調・共同動作は，同期現象と考えられ，非線形現象の1つである．また，オペアンプを用いた発振回路に発光素子と受光素子を用いることで，ホタルと同様に光で結合する光結合型発振回路としてモデル化出来る．この発振回路を用いて複数個結合した場合の同期現象はすでに報告されているが，個々の発振器に関する同期現象の定性的解析は見られられない．本報告では，ホタルを電気回路としてモデル化し，同期現象を調査するため，モデル化した回路に周期外力を加え，様々な周期・結合強度における同期現象を分岐現象として図示する．"},"is_international_presentation":false},"priority":"input_data"} line:434, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798261"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=248327","label":"url"}],"presentation_title":{"en":"馬蹄形写像を利用した周期点の特定と制御","ja":"馬蹄形写像を利用した周期点の特定と制御"},"presenters":{"en":[{"name":"Nakanishi, Takaya"},{"name":"Ito Daisuke"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Imura, Jun'ichi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"中西 崇弥"},{"name":"伊藤 大輔"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"井村 順一"},{"name":"合原 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We propose coupled neuronal models connected by both inhibitory and electrical synapses and investigate the emergence of various synchronous phenomena and its bifurcational structures by the bifurcation analysis.Although it is generally known that strong gap junction synchronize coupled neurons, we show in-phase and anti-phase phenomena in coupled neurons connected by both inhibitory and electrical synapses, and they change to chaotic solutions via period-doubling and pitchfork bifurcations.","ja":"大脳皮質に存在する抑制性介在ニューロンの結合系は，GABA抑制性シナプス結合と電気的結合を有していることから，多様な性質をもつと考えられている．また，gap junction結合により，皮質の同期的活動の検出と伝達に関して，重要な役割を果たしていると示唆されている．本研究では，基礎的研究として，2つのClass 1発火特性をもつ簡素なニューロンモデルをgap junction 結合と抑制性シナプス結合によって接続した系について分岐現象の解析を行い，その結合系にみられる同期現象と結合様式との関係について検討する．"},"is_international_presentation":false},"priority":"input_data"} line:467, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798294"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145451","label":"url"}],"presentation_title":{"en":"Partial Delayed Feedback Control and its DSP Implementation","ja":"部分的遅れ制御とそのDSP実装"},"presenters":{"en":[{"name":"Toyosaki, Yu"},{"name":"Ueta Tetsushi"},{"name":"Tsuji Shigeki"},{"name":"Kousaka Takuji"}],"ja":[{"name":"豊崎 優"},{"name":"上田 哲史"},{"name":"辻 繁樹"},{"name":"高坂 拓司"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2004-06-17","languages":["jpn"],"location":{"en":"Tottori","ja":"鳥取"},"description":{"en":"This paper propose the partial delayed feedback control for chaos circuits with interrupt characteristics. 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As an illustrative example, we apply the control method to a chaotic piecewise smooth circuit.","ja":"本報告では，断続特性を持つカオス回路に対するPartial delayed feedback control¥r¥n(以下PDFC)を提案する．この制御手法の制御入力はスイッチが入力されている間のみ印加される．消費される全エネルギーは従来のDelayed feedback control(以下DFC)と同じであると考えている．この制御手法はDigital signal processor(以下DSP)によって簡単に実装することができる．十分な速度のサンプリング周波数を持つDSPによって，回路からの出力電圧の値をDSPのメモリに格納し，よって，遅延させた出力電圧の値を得ることができる．我々はこの制御法を，特性に不可微分点を持つ区分線形系に応用した．"},"is_international_presentation":false},"priority":"input_data"} line:468, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798295"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145444","label":"url"}],"presentation_title":{"en":"脚式走行ロボットにおける非線形振動","ja":"脚式走行ロボットにおける非線形振動"},"presenters":{"en":[{"name":"Hyon, Sanghoo"},{"name":"Emura, Suguru"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"玄 相昊"},{"name":"江村 超"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2004-05-18","languages":["jpn"],"description":{"en":"In this paper, we report on the analysis and orbital stabilization of periodic gaits of a planar one-legged robot. The robot is installed with linear springs at the telescopic knee joint and torsional springs at the hip joint. Two stabilizing controllers that asymptotically stabilize periodic passive gaits are derived. The main part of the second controller is based on ``energy-preserving principle¥\" and generates interesting quasi-periodic running gaits, which can be seen in Hamiltonian system. With an additional adaptive scheme similar to delayed feedback in chaotic system, the controller achieves orbitaly stabilization to (unknown) passive running gaits.","ja":"本稿では伸縮型の膝関節と股関節に線形バネを有する平面1脚ロボットの受動走行の解析と制御について述べる．まず，受動走行に相当する周期軌道を数値的に探索し，その安定性について解析する．次に，ロボットを安定化するための二つの制御則を提案する．一つは数値的に得られた周期軌道の線形化Poincar¥¥'e写像に基づく線形フィードバック制御であり，もう一つはエネルギー保存原理に基づく非線形フィードバック制御である．とくに後者の制御によってハミルトン系に見られるような準周期解が得られることをシミュレーションによって示す．さらに，準周期解の回帰性に着目し，カオス制御の一つである遅延フィードバックを適用する．シミュレーションから，準周期解が未知の周期軌道に漸近安定化され，さらにエネルギー適応制御によって完全な受動走行に安定化されることを示す．"},"is_international_presentation":false},"priority":"input_data"} line:469, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798296"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=82601","label":"url"}],"presentation_title":{"en":"A Study on Polishing up the Security Policy Documents in accordance with Information Security Management 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Electronics, Information and Communication Engineers"},"is_international_presentation":false},"priority":"input_data"} line:482, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798309"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145555","label":"url"}],"presentation_title":{"en":"Calculation of the Bifurcation sets in the Buck Converter","ja":"バックコンバータ回路における分岐計算法"},"presenters":{"en":[{"name":"Harada, Hideaki"},{"name":"Kousaka Takuji"},{"name":"Abe, Minoru"},{"name":"Kawakami Hiroshi"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"原田 秀明"},{"name":"高坂 拓司"},{"name":"安倍 稔"},{"name":"川上 博"},{"name":"上田 哲史"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2002-01-28","languages":["jpn"],"location":{"en":"Kitakyushu","ja":"北九州"},"description":{"en":"Recently, various bifurcation phenomena have been observed in the simple power electronics circuits. Since current or voltage controlled converters have wide industrial application, it is a important problem to clarity the property of the power electronics systems in the mathematical point of view. However, there are very few methods being developed in the literature for the bifurcation analysis and its property. In this paper, we investigate the bifurcation phenomena in a simple DC-DC buck converter. We have also propose a method to trace the local bifurcation sets in such converters. Some of theoretical results are verified by laboratory experiments.","ja":"近年，簡単なパワーエレクトロニクス回路においても様々な分岐現象が観測されており，分数調波やカオスアトラクタの発生が報告されている．これらの非線形現象は回路を製作する際に致命的なものとなるため，パラメータ空間のどの場所で発生するかを知ることは重要である．本稿では，DC-DCバックコンバータ回路における分岐現象について調べ，回路実装により確認する．また，バックコンバータ回路における局所的な分岐集合を追跡する計算法を提案する．"},"is_international_presentation":false},"priority":"input_data"} line:483, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798310"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145554","label":"url"}],"presentation_title":{"en":"Bifurcation and Chaos of Periodic Solutions in the Custom BVP Oscillator","ja":"変形BVP発振器に生じる周期解の分岐とカオス"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2001-11-28","languages":["jpn"],"is_international_presentation":false},"priority":"input_data"} line:484, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798311"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145548","label":"url"}],"presentation_title":{"en":"The design and its implementation of the bursting in BVP oscillator","ja":"BVP発振器におけるバースト発振の設計と実現"},"presenters":{"en":[{"name":"Tsuji Shigeki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"辻 繁樹"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"合原 一幸"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2001-11-28","languages":["jpn"],"description":{"en":"Bursting observed in nerve membranes is regarded to be important when the information representation problem in brain is considered. Until now, various bursting responses are illustrated in the mathematical model, and accordingly their related bifurcation mechanisms have been clarified. In this paper, we propose an oscillator showing bursting response with a simple circuitry, the circuit equation is represented as a BVP(FitzHugh-Nagumo)model equation. Firstly we investigate bifurcation structure in the autonomous system. Then an effective and reasonable perturbation of theh external force to this bifurcation structure to generate various bursting responses. Secondly we show various burst oscillations are observed by changing the frequency and amplitude of sinusoidal wave. Finally we show a laboratory experiments of the circuit.","ja":"神経細胞膜において観測されるバースト発振は,神経細胞の振舞いを考える上で重要であり,これまでに,数理モデルにおいて観測される様々なタイプのバースト発振について,分岐メカニズムが明らかにされ,分類されている.本報告では,実回路上において,バースト発振を実現させるために,回路方程式が,BVP(FitzHugh-Nagumo)モデル方程式で表されるBVP発振器に着目し,BVP発振器の回路方程式にみられる分岐現象の解析を行うことにより,バースト発振の設計を行い,実際にバースト発振が実回路上で観測されることを示す.また,正弦波の周波数,振幅を変えることにより,様々なバースト発振が観測されることを報告する."},"is_international_presentation":false},"priority":"input_data"} line:485, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798312"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145553","label":"url"}],"presentation_title":{"en":"Bifurcation in Coupled BVP Oscillators","ja":"BVP発振器の結合方式と分岐について"},"presenters":{"en":[{"name":"Miyazaki, Hisayo"},{"name":"Ueta Tetsushi"},{"name":"Kousaka Takuji"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"宮崎 久代"},{"name":"上田 哲史"},{"name":"高坂 拓司"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2001-09-06","languages":["jpn"],"location":{"en":"Kobe","ja":"神戸"},"description":{"en":"BVP oscillator is the simplest mathematical model describing a neural activity. However, even if two BVP oscillators are merely compled by a linear element, the whole system exhibits complicated behavior. For studying such coupled system, identical oscillators are often used as an oscillator unit since symmetrical properties sometimes reduce the bifurcation problem about equilibria and periodic solutions. In this paper, we analyze a coupled BVP oscillators with asymmetrical coupling structure, besides, each oscillator has different internal registance. We should the whole four-dimensional system, but the system shows strange attractors. We calculate bifurcation diagrams and confirm relevant phenomena in the laboratory experiments. Furthermore, we try to reduce the system dimension by removing passive and active elements.","ja":"BVP発振器は,神経回路を記述する簡素なモデルである.しかし,同一のBVP発振回路による高々2個の結合系においても,分岐現象やカオスが観測される複雑な力学系である.本報告では,非対称な結合方式による結合BVP発振器系にみられる分岐現象とカオスについて考察する.また電気回路における実験結果も示す.最後に3階自律系への減次も試みた."},"is_international_presentation":false},"priority":"input_data"} line:486, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798313"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145547","label":"url"}],"presentation_title":{"en":"The generating mechanism of bursting in FitzHugh-Nagumo model and design of its external force","ja":"FitzHugh-Nagumoモデルにおけるバーストの発生機序と外部摂動の設計"},"presenters":{"en":[{"name":"Tsuji Shigeki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"辻 繁樹"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"合原 一幸"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2001-09-06","languages":["jpn"],"description":{"en":"Firing phenomenon called spiking and bursting observed in nerve cell membranes are regarded to be important when the information representation problem in brain is considered. Until now, various bursting responses observed in the mathematical model have been classified, and accordingly their related bifurcation mechanisms on have been clarified. In this papaer, we propse a FitzHugh-Nagumo model with a simple periodic external force. The external input gives periodic activity to the autonomous system, and it is expected that the generating mechanism of bursting is constructed. The parameter regions sectioned by bifurcation curves are obtained as bursting or spiking regions.","ja":"神経細胞膜において観測されるスパイク(発火),バーストと呼ばれる発火現象は,情報表現問題を考える上で重要であると考えられており,これまでに,数理モデルにおいて観測される様々なバースト応答とそれに関する分岐メカニズムが明らかにされ,分類されている.本稿では，FitzHugh-Nagumoモデルに対して簡素な周期外力を加えて外部入力を周期的に変化させ,バースト発生機構を構築するとともに,この系が有する周期解の分岐現象の解析を行いバーストが生じるパラメータ領域の存在を確認した."},"is_international_presentation":false},"priority":"input_data"} line:487, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798314"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145546","label":"url"}],"presentation_title":{"en":"Experimental Control of Chaotic Behavior in a State-Dependent Nonlinear Circuit","ja":"状態依存型スイッチを有する非線形回路に発生するカオスの実装制御"},"presenters":{"en":[{"name":"Yasuhara, Yoshihito"},{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Abe, Minoru"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"安原 義仁"},{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"安倍 稔"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2001-05-22","languages":["jpn"],"description":{"en":"There have been numerous theoretical and experimental investigations on the controlling chaos in the piecewise linear systems. This paper reports a method for controlling chaos in the nonlinear dynamical systems with interrupted characteristics. Some of theoretical results are confirmed by experiment al laboratory.","ja":"区分線形系に発生するカオスの制御については,いくつかの制御法が提案され,理論的・実験的に検討されつつある.本稿では先にわれわれが提案したした手法を用い,ある状態依存型のスイッチを有する区分非線系のカオス制御の回路実装を実際に試みる."},"is_international_presentation":false},"priority":"input_data"} line:488, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798315"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145545","label":"url"}],"presentation_title":{"en":"周期外力を付加したAmari-Hopfieldニューロン対におけるバースト応答の分岐","ja":"周期外力を付加したAmari-Hopfieldニューロン対におけるバースト応答の分岐"},"presenters":{"en":[{"name":"Tsuji Shigeki"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"辻 繁樹"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"合原 一幸"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2001-03-09","description":{"en":"When considering the mechanism of an information processing mechanism in the brain of a living body, the problem of information coding of a neuron, etc., the mathematical model of a neuron is indispensable. According to a point of view and the purpose, various models are formulized until now, and analysis is advanced. In this paper, correspondence is investigated about a classification of bifuracation by Izhikevich et al., and a burst response in an Amari-Hopfield model. It is thought that it is important to investigate the various burst response type which realizes a burst response of the given specification, and it becomes information useful as a design problem of a burst response to solve the bifurcation diagram according to the parameter of external force.","ja":"生体の脳における情報処理機構のメカニズムや,ニューロン(神経細胞)の情報表現の問題などを考える上で,ニューロンの数理モデルの構築と解析は欠かせないものである.これまでに着眼点,目的に応じて様々なモデルが定式化されており,解析が進められている.本報告では,Amari-Hpfieldモデルにおいて,Izhikevichらによる分岐とバースト応答の分類について対応を調べる.与えられた仕様のバースト応答を実現するという問題に対し簡単な周期外力を考えて,その振幅と周波数により変化する様々なタイプのバースト応答を調べておくことは,重要であり,，また,バースト応答の定性的性質の変化のいくつかは分岐によって説明できるため,外力のパラメータに応じた分岐図をもとめることは,バースト応答の設計問題として有用な情報となると考えられる."},"is_international_presentation":false},"priority":"input_data"} line:489, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798316"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145544","label":"url"}],"presentation_title":{"en":"Bifurcation and Chaos in Coupled BVP Oscillators","ja":"結合BVP発振器の分岐とカオス"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Kousaka Takuji"},{"name":"Miyazaki, Hisayo"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"上田 哲史"},{"name":"高坂 拓司"},{"name":"宮崎 久代"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2001-03-09","languages":["jpn"],"description":{"en":"BVP oscillator is one of classic model exhibiting typical nonlinear phenomena in the planar autonomous system and it has been studied for last three decades. This report shows bifurcation and chaos in resistively coupled BVP oscillators. Each oscillator has different value of internal resister, i.e., different frequency oscillators are coupled. Bifurcation diagrams are obtained numerically from mathematical model and chaotic parameter regions are clarified. This result also points out that the coupling system of identical oscillators does not behave chaotically with reasonable parameter range. We also confirm the existence of period-doubling cascades and chaotic attractors in experimental laboratory.","ja":"BVP方程式は,ニューロン結合系や非線形電気回路など,様々な非線形力学系のモデルとして用いられてきた.本報告では,BVP回路の内部抵抗を異なる値に設定し,抵抗で結合した場合にみられる周期解め分岐とカオスについて述べる.また電気回路における実装と実験結果を示す."},"is_international_presentation":false},"priority":"input_data"} line:490, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798317"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145564","label":"url"}],"presentation_title":{"en":"On an Electric Circuit Interrupted by Own State and a Periodic Interval --- Control","ja":"状態・時刻混合型断続特性を有する系について --- 制御"},"presenters":{"en":[{"name":"Kousaka Takuji"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"},{"name":"Tahara, Shoichi"},{"name":"Abe, Minoru"}],"ja":[{"name":"高坂 拓司"},{"name":"上田 哲史"},{"name":"川上 博"},{"name":"田原 正一"},{"name":"安倍 稔"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2000-11-24","languages":["jpn"],"description":{"en":"This report consider a system interrupted by own state and a periodic interval. We know above system has prospects of occurrence of border-collision bifurcation. Firstly, we propose a simple model that occurs border-collision bifurcation, and consider periodic orbits, their stabilities and bifurcations. Some of theoretical results are verified by laboratory experiments. Secondly, we analyze dc-dc converter. Finally, We propose a method to trace bifurcation sets for a piecewise nonlinear equation interrupted by own state and periodic interval.","ja":"状態・時刻混合型断続特性を有する系にみられる分岐現象について解析を行う.このクラスは外力の周期に合わせて写像を定義することでPoincare写像を表現でき,分岐集合の計算が可能となる.また,上記の特性を有する場合は一般にborder-collision分岐を発生する可能性があり興味深い.まず,Border-Collision分岐を生じる簡素な回路に関して詳細な解析を行う.次に,2次元区分線形系で記述されるDC-DCコンバータを簡単に解析する.最後に,状態・時刻混合型断続特性を有する系における局所的分岐集合を追跡する一計算法を提案する."},"is_international_presentation":false},"priority":"input_data"} line:491, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798318"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145543","label":"url"}],"presentation_title":{"en":"Calculation of the Isocline for the Fixed Point with a specifiled Argument of Complex Multipliers","ja":"指定する偏角をもつ固定点のパラメータ集合について"},"presenters":{"en":[{"name":"Tsuji Shigeki"},{"name":"Miyazaki, Hisayo"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"辻 繁樹"},{"name":"宮崎 久代"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"2000-11-24","languages":["jpn"],"location":{"en":"Tokushima","ja":"徳島"},"description":{"en":"This paper proposes a calculation method to obtain the location of the fixed point in given nonlinear discrete system when the argument of complex multipliers is specified. We can calculate isoclines corresponding to the specified arguments, then the stability and instantaneous phase around the fixed point is clarified. As an application, we also propose a new calculation method of NS bifurcation parameter values with specified argument. In addition, cross points of a cusp in a periodic entrainment region and the NS bifurcation curve is identified by this application.","ja":"非線形力学系において,系に含まれるパラメータの変動により,固定点の特性乗数が複素単位円を横切るときに,様々な局所的分岐現象がみられる.本稿では,複素共役な特性乗数をもつ固定点に対して,偏角を指定することにより,その偏角における固定点の位置,動径,パラメータ値を,数値計算する方法について述べる.また,その応用として,偏角情報をもとにしたNeimark-Sacker分岐パラメータ値を求める計算方法を提案する."},"is_international_presentation":false},"priority":"input_data"} line:492, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798319"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145541","label":"url"}],"presentation_title":{"en":"On an Electric Circuit Interrupted by Own State and a Periodic Interval --- Bifurcation","ja":"状態・時刻混合型断続特性を有する系について --- 分岐"},"presenters":{"en":[{"name":"Kousaka Takuji"},{"name":"Kido, Takashi"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"高坂 拓司"},{"name":"木戸 高志"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"1999-11-05","languages":["jpn"],"description":{"en":"This report consider a system interrupted by own state and a periodic interval. We know above system has prospects of occurrence of border-collision bifurcation. Firstly, we propose a simple model that occurs border-collision bifurcation, and consider periodic orbits, their stabilities and bifurcations. Some of theoretical results are verified by laboratory experiments. Secondly, we analyze dc-dc converter. Finally, We propose a method to trace bifurcation sets for a piecewise nonlinear equation interrupted by own state and periodic interval.","ja":"状態・時刻混合型断続特性を有する系にみられる分岐現象について解析を行う.このクラスは外力の周期に合わせて写像を定義することでPoincare写像を表現でき,分岐集合の計算が可能となる.また,上記の特性を有する場合は一般にborder-collision分岐を発生する可能性があり興味深い.まず,Border-Collision分岐を生じる簡素な回路に関して詳細な解析を行う.次に,2次元区分線形系で記述されるDC-DCコンバータを簡単に解析する.最後に,状態・時刻混合型断続特性を有する系における局所的分岐集合を追跡する一計算法を提案する."},"is_international_presentation":false},"priority":"input_data"} line:493, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798320"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=145538","label":"url"}],"presentation_title":{"en":"区分線形力学系における不安定軌道の効果的な計算方法とカオス制御","ja":"区分線形力学系における不安定軌道の効果的な計算方法とカオス制御"},"presenters":{"en":[{"name":"Ueta Tetsushi"},{"name":"Chen, Guanrong"},{"name":"Kawabe, Tohru"}],"ja":[{"name":"上田 哲史"},{"name":"陳 関栄"},{"name":"河辺 徹"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"1999-06-21","languages":["jpn"],"description":{"en":"This paper describes a simple method for calculating unstable periodic orbits (UPOs) and their control in piecewisc-linear autonomous systems. The algorithm can be used to obtain any desired UPO embedded in a chaotic a. ttractor ; and the UPO can be stabilized by a simple state feedback control. A brief stability analysis of the controlled system is also given.","ja":"区分線形力学系における周期解の計算方法とその応用について検討した．区分線形系の解は区分的に厳密に求められるが，周期点や分岐集合を計算する上で，再帰時刻は数値的に求めざるを得ない．そこで本研究では，微分方程式，変分方程式，ポアンカレ断面だけを情報として与え，ポアンカレ写像の合成によって数値的に周期点を求めるアルゴリズムについて検討した．さらにカオス中の不安定軌道の計算に応用し，同時に状態フィードバックによる不安定軌道の安定化問題について，その安定性を検討した．"},"is_international_presentation":false},"priority":"input_data"} line:494, {"insert":{"user_id":"1000039004","type":"presentations","id":"31798321"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=104265","label":"url"}],"presentation_title":{"en":"相似領域可変型フラクタル符号化の画像領域分割への応用","ja":"相似領域可変型フラクタル符号化の画像領域分割への応用"},"presenters":{"en":[{"name":"武内 朗"},{"name":"Ueta Tetsushi"},{"name":"Terada Kenji"}],"ja":[{"name":"武内 朗"},{"name":"上田 哲史"},{"name":"寺田 賢治"}]},"event":{"en":"IEICE Technical Report","ja":"電子情報通信学会技術研究報告"},"publication_date":"1999-06","is_international_presentation":false},"priority":"input_data"} line:495, 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