- 2007 - Hokkaido University Institute of Low Temperature Science
- 2005 - Hokkaido University Institute of Low Temperature Science
- 2001 - Hokkaido University Institute of Low Temperature Science
- 1995 - Hokkaido University Institute of Low Temperature Science
- 1995 - : Professor, Marine and Atmospheric Science Research
- 1990 - Hokkaido University Institute of Low Temperature Science
- 1990 - : Professor, Oceanography Section, Institute of
- 1986 - Hokkaido University Institute of Low Temperature Science
- 1986 - : Associate Professor, Oceanography Section,
- 1983 - Hokkaido University Institute of Low Temperature Science
- 1983 - : Lecturer, Oceanography Section, Institute of
- 1971 - Hokkaido University Institute of Low Temperature Science
- 1971 - : Assistant Professor, Oceanography Section,
- Hokkaido University
- Section, Institute of Low Temperature Science,
- Low temperature, Hokkaido University
- Institute of Low temperature, Hokkaido University