| 1994-1996 | Research Fellow (Ph.D.) of the Japan Society for the Promotion of Science. |
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| 1996-1999 | Research Associate, Department of Electrical and Electronic Engineering, Faculty of Engineering, Yamaguchi University, Yamaguchi, Japan. |
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| in 1998 | Visiting Scholar, Department of Materials Science and Engineering, Massachusetts Institute of Technology (MIT), USA. in Boston |
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| 1999 | Research Associate, Dept. of Electronics, Graduate school of Information Science and Engineering, Kyushu University, Fukuoka, Japan. |
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| 2002 | Research Associate, System LSI Research Center , Kyushu University (Additional) |
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| 2003 | Associate Professor, Dept. of Electronics, Graduate school of Information Science and Engineering, Kyushu University, Fukuoka, Japan. |
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| 2019 | Professor, Dept. of Electronics, Graduate school of Information Science and Engineering, Kyushu University, Fukuoka, Japan. |
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