- 2012 - 2016 The integrated study of orders and valuation rings
- 2009 - 2011 A study of integrated orders and its applications
- 2006 - 2008 The study of the structure of Ore extension and its application
- 2003 - 2004 Combinatorial semigroup theory and its applications
- 2001 - 2004 Synthetic Study of Prufer Orders and Semi-hereditary Orders
- 2001 - 2002 Combinatorial semigroup theory and its applications
- 2000 - 2001 Research of quasi-Frobenius rings and representation theory
- 1999 - 2000 Combinatorial semigroup theory and its applications
- 1997 - 2000 Non-commutative Valuation Rings and Applications to their Global Theories Quantum Groups
- 1997 - 1998 COMBINATORIAL SEMIGROUP THEORY AND ITS APPLICATIONS
- 1993 - 1993 非可換付値環と非可換Prufer環に関する研究
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