- 1993 - 1994 Kyushu University
- 1993 - 1994 Kyushu University, Lecturer
- 1990 - 1993 Fukuoka Institute of Technology
- 1990 - 1993 Fukuoka Institute of Technology, Lecturer(pat time)
- 1988 - 1989 The Ohio State University
- 1988 - 1989 The Ohio State University, Lecturer
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