- 1991 - 1998 Takushoku University
- 1991 - 1998 Takushoku University, assistant professor
- 1998 - - 拓殖大学 教授
- 1998 - - Takushoku University, professor
- 1987 - 1991 Takushoku University
- 1987 - 1991 Takushoku University, lecturer
- 1977 - 1987 Hitachi, Ltd., Central Research Laboratory
- 1977 - 1987 Hitachi, Ltd, Central Research Laboratory,
- researcher
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