{"insert":{"user_id":"1000039004","type":"presentations","id":"51643049"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=457941","label":"url"}],"presentation_title":{"en":"Stabilization of Pseudo-Periodic Solutions in a Mathematical Model of the Stimulus Conduction System","ja":"Stabilization of Pseudo-Periodic Solutions in a Mathematical Model of the Stimulus Conduction System"},"presenters":{"en":[{"name":"Katayama, Michiru"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"Katayama, Michiru"},{"name":"上田 哲史"}]},"event":{"en":"Proc. NOLTA2025","ja":"Proc. NOLTA2025"},"publication_date":"2025-10-28","languages":["eng"],"promoter":{"en":"Institute of Electronics, Information and Communication Engineers","ja":"Institute of Electronics, Information and Communication Engineers"},"location":{"en":"Naha","ja":"Naha"},"description":{"en":"Normal sinus rhythm is achieved when electricalimpulses generated in the sinoatrial node are normallytransmitted to the atria and ventricles via the conductionsystem, which includes the atrioventricular node, the Hisbundle, and Purkinje fibers. However, to maintain optimalblood circulation, in addition to stable sinus rhythm, thecoordinated function of the entire conduction system mustbe sufficiently maintained. The electrocardiogram reflectsthe activity of the entire conduction system, and records notonly normal sinus rhythm, but also electrical changes thatmay interfere with the normal transport of blood, includingarrhythmias and conduction abnormalities.Ventricular fibrillation, one of the most serious arrhythmias,has been noted to have a chaotic electrocardiogramwaveform, and methods to suppress this are of great significancein maintaining the health of patients. In thisstudy, we perform numerical simulations of chaos controlusing pseudo-periodic solutions for intermittent chaos in amathematical model of the conduction system. Intermittentchaos occurs at specific parameters in the model, and theperiodic solution transforms into a chaotic waveform. Thetangential bifurcation that occurs here is accompanied bythe disappearance of the unstable periodic solution, makinga chaos control method using pseudo-periodic solutionseffective. We present the results of numerical calculationsapplying this method to a mathematical model of the conductionsystem, and demonstrate the possibility of applyingit to suppressing arrhythmias.","ja":"Normal sinus rhythm is achieved when electricalimpulses generated in the sinoatrial node are normallytransmitted to the atria and ventricles via the conductionsystem, which includes the atrioventricular node, the Hisbundle, and Purkinje fibers. However, to maintain optimalblood circulation, in addition to stable sinus rhythm, thecoordinated function of the entire conduction system mustbe sufficiently maintained. The electrocardiogram reflectsthe activity of the entire conduction system, and records notonly normal sinus rhythm, but also electrical changes thatmay interfere with the normal transport of blood, includingarrhythmias and conduction abnormalities.Ventricular fibrillation, one of the most serious arrhythmias,has been noted to have a chaotic electrocardiogramwaveform, and methods to suppress this are of great significancein maintaining the health of patients. In thisstudy, we perform numerical simulations of chaos controlusing pseudo-periodic solutions for intermittent chaos in amathematical model of the conduction system. Intermittentchaos occurs at specific parameters in the model, and theperiodic solution transforms into a chaotic waveform. Thetangential bifurcation that occurs here is accompanied bythe disappearance of the unstable periodic solution, makinga chaos control method using pseudo-periodic solutionseffective. We present the results of numerical calculationsapplying this method to a mathematical model of the conductionsystem, and demonstrate the possibility of applyingit to suppressing arrhythmias."},"is_international_presentation":true},"priority":"input_data"}
{"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"}
{"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"}
{"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"}
{"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"}
{"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"}
{"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"}
{"insert":{"user_id":"1000039004","type":"presentations","id":"31797894"},"force":{"see_also":[{"@id":"https://www.scopus.com/pages/publications/85010465159","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"}
{"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"}
{"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"}
{"insert":{"user_id":"1000039004","type":"presentations","id":"31797915"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=261087","label":"url"}],"presentation_title":{"en":"Numerical validation for blurred basin of symmetric equilibria in a 3D autonomous system","ja":"Numerical validation for blurred basin of symmetric equilibria in a 3D autonomous system"},"presenters":{"en":[{"name":"Inaba, Jumpei"},{"name":"Nishiuchi, Yusuke"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"稲葉 純平"},{"name":"Nishiuchi, Yusuke"},{"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"}
{"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. ITC-CSCC 2012"},"publication_date":"2012-10","languages":["eng"],"location":{"en":"Sapporo","ja":"Sapporo"},"is_international_presentation":true},"priority":"input_data"}
{"insert":{"user_id":"1000039004","type":"presentations","id":"31797924"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=277147","label":"url"}],"presentation_title":{"en":"Bifurcation Phenomena of a Light Coupled Oscillator with a Clock Pulse Input","ja":"Bifurcation Phenomena of a Light Coupled Oscillator with a Clock Pulse Input"},"presenters":{"en":[{"name":"Ito Daisuke"},{"name":"Takaya Nakanishi"},{"name":"Tsuji Akinori"},{"name":"Ueta Tetsushi"},{"name":"Kawakami Hiroshi"}],"ja":[{"name":"伊藤 大輔"},{"name":"中西 崇弥"},{"name":"辻 明典"},{"name":"上田 哲史"},{"name":"川上 博"}]},"event":{"en":"Proc. NCSP 2012","ja":"Proc. NCSP 2012"},"publication_date":"2012-03","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"}
{"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. ISIMM2011"},"publication_date":"2011-03-01","languages":["eng"],"location":{"en":"Tokyo","ja":"Tokyo"},"is_international_presentation":true},"priority":"input_data"}
{"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"}
{"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"}
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{"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"}
{"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"}
{"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"}
{"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"}
{"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"}
{"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"}
{"insert":{"user_id":"1000039004","type":"presentations","id":"31798238"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=307099","label":"url"}],"presentation_title":{"en":"研究活動の持続的成長を支援するeポートフォリオシステムの提案","ja":"研究活動の持続的成長を支援するeポートフォリオシステムの提案"},"presenters":{"en":[{"name":"Seki Yosuke"},{"name":"野村 卓哉"},{"name":"曽我部 紗也香"},{"name":"Sano Masahiko"},{"name":"Matsuura Kenji"},{"name":"Ohira Kenji"},{"name":"Ueta Tetsushi"}],"ja":[{"name":"関 陽介"},{"name":"野村 卓哉"},{"name":"曽我部 紗也香"},{"name":"佐野 雅彦"},{"name":"松浦 健二"},{"name":"大平 健司"},{"name":"上田 哲史"}]},"event":{"en":"IPSJ SIG Technical Report","ja":"情報処理学会研究報告"},"publication_date":"2016-02","languages":["jpn"],"location":{"en":"Tokyo","ja":"東京"},"is_international_presentation":false},"priority":"input_data"}
{"insert":{"user_id":"1000039004","type":"presentations","id":"31798244"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=288136","label":"url"}],"presentation_title":{"en":"Bifurcation Avoidance of Stable Periodic Oscillations in Continuous-Time Duffing Equation","ja":"Duffing方程式における安定周期振動の分岐回避"},"presenters":{"en":[{"name":"Otsu, Tomohiro"},{"name":"Fujimoto Ken'ichi"},{"name":"Ueta Tetsushi"},{"name":"Aihara Kazuyuki"}],"ja":[{"name":"大津,智弘"},{"name":"藤本 憲市"},{"name":"上田 哲史"},{"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":"2014-11-26","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":"We previously proposed a parametric control method to avoid bifurcations of stable fixed and periodic points in discrete-time dynamical systems. 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"}
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{"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"}
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