| 1992. | 3. | Hebei Semiconductor Research Institute, Assistant Engineer |
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| 1995. | 4. | Hebei Semiconductor Research Institute, Engineer |
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| 1995. | 12. | Hebei Semiconductor Research Institute, Department of GaAs Very High Speed Integrated Circuits, Vice-Director |
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| 1998. | 4. | Hebei Semiconductor Research Institute, Senior Engineer |
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| 2001. | 2. | Satellite Venture Business Laboratory, The University of Tokushima, Researcher |
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| 2003. | 12. | Department of Electrical and Electronic Engineering, Faculty of Engineering, The University of Tokushima, Assistant Professor |
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| 2006. | 4. | Institute of Technology & Science, Graduate School, The University of Tokushima, Assistant Professor |
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| 2007. | 1. | Institute of Technology & Science, Graduate School, The University of Tokushima, Associate Professor |
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