- 1995/04 - 現在 Yamagata University Faculty of Science
- 1995/04 - 現在 Yamagata University Graduate School of Science and Engineering
- 1995/04 - 現在 Professor,Department of Mathematical Sciences,Faculty of Science,Yamagata University
- 1995/04 - 現在 Professor,Graduate School of Science and Engineering ,Yamagata University
- 1983/04 - 1995/03 Yamagata University Faculty of Science
- 1983/04 - 1995/03 Associate Professor,Department of Mathematical Sciences,Faculty of Science,Yamagata University
- 1975/04 - 1983/03 Yamagata University Faculty of Science
- 1975/04 - 1983/03 Lecturer,Department of Mathematical Sciences,Faculty of Science,Yamagata University
- 1973/04 - 1975/03 Yamagata University Faculty of Science
- 1973/04 - 1975/03 Research Associate,Department of Mathematical Sciences,Faculty of Science,Yamagata University
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