- 1998 - 2003 京都大学総合人間学部助教授
- 1997 - 1998 Kyoto Sangyo University Faculty of Science
- 1997 - 1998 Kyoto Sangyo Univevsity, Faculty of Science, Associate Professon.
- 1994 - 1997 Kyoto Sangyo University Faculty of Science
- 1994 - 1997 Kyoto Sangyo University, Faculty of Science, Lecturer.
- 1990 - 1994 Keio University Faculty of Environment and Information Studies
- 1990 - 1994 Keio University, Faculty of Environmental Information, Research Assistont
- 1988 - 1990 Kyoto University Research Institute for Mathematical Sciences
- 1988 - 1990 Kyoto University. Research Institute for Mathematial Science, Research Assistant
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