- 1995/04 - 現在 Yamagata University Faculty of Science, Department of Physics
- 1995/04 - 現在 Professor,Department of Physics,Faculty of Science,Yamagata University
- 2007/04 - 2008/03 The University of Tokyo Institute for Cosmic Ray Research
- 2007/04 - 2008/03 Others
- 1992/04 - 1995/03 Yamagata University Faculty of Science, Department of Physics
- 1992/04 - 1995/03 Associate Professor,Department of Physics,Faculty of Science,Yamagata University
- 1981/10 - 1992/03 Yamagata University Faculty of Science, Department of Physics
- 1981/10 - 1992/03 Research Associate,Department of Physics,Faculty of Science,Yamagata University
- 1989/11 - 1991/06 NASA マーシャルスペースフライトセンター スペースサイエンス研究所 NASA マーシャルスペースフライトセンター スペースサイエンス研究所客員研究員
- 1989/11 - 1991/06 NASA Marshall Space Flight Center NRC Senior Research Associate
- Yamagata University
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