- 2014 - 2018 Creation of "Current Old Grammar Dictionary", finding a classic word corresponding to a modern word in a grammatical form
- 2013 - 2016 Compilation and Investigation of KageroNikki Lexicon with All Instances
- 2013 - 2015 the historical study from the viewpoint of use frequency and meaning of word by using 'Nihon Koten Taisho Bunrui Goihyo'
- 2010 - 2012 Compilation and Investigation of Tohazugatari Lexicon with All Instances
- 2008 - 2009 古典文芸作品の用語の語義別出現頻度に関する調査研究
- 2005 - 2007 Research on theoretical problem on building of KWIC of "konjakumonogatarishu", and research on possibility of lexicological and grammatical use of that KWICK
- 2002 - 2004 Research on calculation of the vocabulary of konzyakumonogatarisyu, and the vocabulary of works in the first half of medieval
- 1999 - 2000 A Fundamental Research for Lexicometrics of Japanese Medieval Literary Works
- 1992 - 1993 STUDY OF CONSTRUCTION AND USE OF THESAURUS OF JAPANESE WORDS AS DATABASE
- 1989 - 1990 The Application of Thesaurus to Linguistic Research
- 中世日本語の表現史的研究
- Historical Study of Expression of Middle Japanese
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