- 2020 - 2023 Freedom of Expression and Feasibility of Deliberation in a Post-Truth Age: Beyond Fake News
- 2015 - 2019 Reformation of the fundamental structure of the judiciary through publication and participation.
- 2014 - 2017 The Conception of a Self-Reflective Society in the Post-Great East Japan Earthquake Era: From the Viewpoint of Freedom of Information
- 2012 - 2015 Toward construction of a general normative theory for publicness: cooperation of economics, political science, and law
- 2011 - 2014 占領期日本の情報空間-検閲とインテリジェンス
- 2011 - 2014 危機のアメリカ「選挙デモクラシー」:社会経済変化と政治的対応
- 2009 - 2013 The Reception and Developments of Western Constitutional Theory in Asia : the Comparative Research of Japanese and Taiwanese Constitutional Law
- 2009 - 2011 Political Economy of Publicness : Construction of a New Theory by Cooperation from Economics, Political Science and Jurisprudence
- 2006 - 2008 Toward Political Economy of Social Justice : Synthesis of Researches by Economics, Political Science, and Legal Studies
- 2006 - 2007 Tocqueville and the Political Theory of the 20th Century-An Intellectual History on the Formation of Liberal Democracy
- 2004 - 2005 Tocpueville and Two Models of Democracy : A Comparative Historical Study of American and French political Cultures
- 2003 - 2005 Toward Reconstruction of Political Economy : A Synthetic Study of Ideas and Institutions by Economics, Political Science, and Jurisprudence
- 2000 - 2002 Medical Policies in the Aged Societies - Bioethics and Budget Constraints
- アメリカ憲法判例の総合的分析に基づく憲法訴訟の研究
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