- 2010 - 2011 Project Research Center for Pure and Applied Mathematics, Hiroshima University Derector
- 2003 - 2011 Department of Mathematics, Graduate School of Science, Hiroshima University Associate Professor
- 2000 - 2011 Department of Applied Mathematics, Graduate School of Engineering, Hiroshima University Associate Professor
- 2011 - Department of Mathematics, Faculty of Science and Technology, Tokyo University of Science Professor
- 2002 - 2010 Department of Information Technology, Okayama University Part-time Lecturer
- 2006 - 2007 Faculty of Life and Envirnmental Sciences, Prefectural University of Hiroshima Part-time Lecturer
- 1991 - 2000 Mathematical Institute, Graduate School fo Science, Tohoku University Research Associate
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