- 2024 - 2027 A Study on the Grammar of Discourse in Eurasian Languages
- 2022 - 2025 日本語と朝鮮語の文法体系における名詞化の位置づけに関する対照言語学的研究
- 2019 - 2025 日本語と朝鮮語の文法体系における動詞と名詞の位置づけに関する対照言語学的研究
- 2020 - 2023 Information Structure and the Grammar of Knowledge in Turkic Languages: Interface of Phonology, Morphosyntax and Semantics
- 2019 - 2022 形式語に関する実証的・記述的研究の新段階
- 2015 - 2018 Contrastive Linguistic Studies on Clause Linkages in Japanese and Korean: With Special Reference to the Continuative Form as a Conjunction
- 2014 - 2017 A Comprehensive Research on So-Called Formal Words and Morphemes: With Special Focus on Compound Particles that Allow for Rich Expressivity in Japanese
- 2009 - 2016 Syntactic, Semantic, and Morphological Characteristics of the Japanese Lexicon
- 2011 - 2014 Contrastive Linguistic Studies on Factors for Grammaticalization in Japanese and Korean
- 2009 - 2014 Compilation of a Handbook of Usage of Japanese Basic Verbs for JFL Learners
- 2010 - 2013 Cross-Linguistic Studies on Clause Combining
- 2011 - 2012 形態論と統語論の相互作用-日本語と朝鮮語の対照言語学的研究-
- 2007 - 2010 A Comprehensive Study of Grammaticalization in Japanese and Korean: A Contrastive Linguistic Approach
- 2005 - 2010 言語の構造的多様性と言語理論-「語」の内部構造と統語機能を中心に
- 2001 - 2002 言語における膠着性・語形成・文法化の類型論的研究
- 1999 - 2002 Making an Experimental Corpus and Its Application to Descriptive Study of Japanese
- 1997 - 2000 A Typological Study on Agglutination of Constituents in Languages of Eastern, Northern, and Western Asia
- 1995 - 1996 A Study on the Interaction of Morphology and Syntax in Agglutinative Languages of Eastern, Northern, and Western Asia
- 1992 - 1996 日本語教育の内容と方法についての調査研究-朝鮮語を母語とする学習者に対する教育-
- 1994 - 1995 膠着言語における形態論と統語論の相互作用について
- 1992 - 1993 現代日本語と現代朝鮮語の形態論・統語論・意味論の研究
- 1991 - 1992 A Contrastive Linguistic Study of Modern Japanese and Modern Korean: With Special Reference to Modality
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- 2024/04 - 現在 Tokyo University of Foreign Studies Research Institute for Languages and Cultures of Asia and Africa Joint Researcher
- 2023/04 - 現在 Kansai Gaidai University School of Japan Studies and Global Communication, College of Foreign Studies Professor
- 2023/04 - 現在 Kansai Gaidai University Master's and Doctoral Programs in Language and Culture, Graduate School of Foreign Studies Professor
- 2023/04 - 現在 Ehime University Professor Emeritus
- 2023/07 - 2023/09 Ehime University Faculty of Law and Letters Part-Time Lecturer
- 2022/10 - 2023/03 The Open University of Japan Faculty of Liberal Arts Part-Time Lecturer
- 2020/04 - 2023/03 Tokyo University of Foreign Studies Research Institute for Languages and Cultures of Asia and Africa Joint Researcher
- 2002/04 - 2023/03 Ehime University Master's Program in Linguistics, Section of Humanities, Graduate School of Humanities and Social Sciences Professor
- 2002/04 - 2023/03 Ehime University Program in Linguistics, Section of Humanities, Department of Humanities and Social Sciences, Faculty of Law and Letters Professor
- 2009/10 - 2016/03 National Institute for Japanese Language and Linguistics Joint Researcher
- 2015/04 - 2015/09 The Open University of Japan Faculty of Liberal Arts Part-Time Lecturer
- 2006/04 - 2013/03 Tokyo University of Foreign Studies Research Institute for Languages and Cultures of Asia and Africa Joint Researcher
- 2011/09 - 2012/02 Kobe City University of Foreign Studies Graduate School of Foreign Studies Part-Time Lecturer
- 2010/04 - 2011/03 Matsuyama University Faculty of Humanities Part-Time Lecturer
- 2008/02 - 2008/03 University of Tsukuba Graduate School of Humanities and Social Sciences Part-Time Lecturer
- 2006/05 - 2008/03 The Open University of Japan Graduate School of Arts and Sciences Visiting Professor
- 2006/10 - 2007/03 Osaka University Graduate School of Letters Part-Time Lecturer
- 2006/07 - 2006/10 Kobe City University of Foreign Studies Graduate School of Foreign Studies Part-Time Lecturer
- 2001/09 - 2003/09 University of California, Santa Barbara Department of Linguistics Visiting Scholar
- 1998/04 - 2002/03 Ehime University Master's Program in Linguistics, Section of Humanities, Graduate School of Law and Letters Associate Professor
- 1988/04 - 2002/03 Ehime University Program in Linguistics, Section of Human Sciences, Department of Humanities, Faculty of Law and Letters Associate Professor
- 2000/09 - 2000/10 University of California, Santa Barbara Department of Linguistics Visiting Scholar
- 1995/04 - 2000/03 Matsuyama Shinonome Women's University Faculty of Humanities Part-Time Lecturer
- 1998/07 - 1999/03 Kagawa University Faculty of Education Part-Time Lecturer
- 1987/04 - 1988/03 Osaka University of Foreign Studies International Student Center, Faculty of Foreign Studies Part-Time Lecturer
- 1987/04 - 1988/03 Kyoto University Faculty of Letters Postdoctoral Research Fellow
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Association for Linguistic Typology Japan
, The Society of Japanese Grammar
, The Association for Natural Language Processing
, Linguistic Society of America
, Association for Linguistic Typology
, The Society for Japanese Linguistics
, American Association of Teachers of Japanese
, The Society for Teaching Japanese as a Foreign Language
, Kansai Linguistic Society
, The Academic Association of Koreanology in Japan
, Linguistic Society of Japan