- 2008/04 - 現在 Graduate University of Advanced Research Professor Emeritus
- 2008/04 - 現在 National Institute of Informatics Professor Emeritus
- 2002/04 - 2008/03 Graduate University of Advanced Research Department of Informatics Professor
- 2000/04 - 2008/03 National Institute of Informatics Research Division of Intelligent System Professor
- 2001/04 - 2002/03 University of Tokyo Graduate School of Information Science Professor
- 1998/08 - 2000 National Center of Science Information System Division of Intelligent Systems Professor
- 1981/10 - 1998/07 Tokyo Denki university Faculty of Systems Engineering Professor
- 1977/04 - 1981/09 Tokyo Denki university School of Science and Engineering Associate Professor
- 1971/04 - 1977/03 Aoyamagakuin University School of Science and Engineering Lecturer
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