| 1 | 日本私学振興財団、龍谷大学社会科学研究所での共同研究、研究題目：地域経済の自立と労働力移動に関する国際共同研究：日本とアジア諸国との経済関係をめぐって (１９９０年～１９９２年)、
Japan Private Education Foundation, Joint Research Project at Ryukoku University Institute of Social Science, Research Topic: International Joint Research on Regional Economic Independence and Labor Migration: With Special Reference to Economic Relationship between Japan and Asian Countries, 1990-2014 |
| 2 | 文部省国際学術研究、広島経済大学経済学部での共同研究、研究題目：アジア諸国の経済発展パターンと我国の経済協力に関する理論的・実証的研究 (１９９１年～１９９４年).
Grant-in-Aid for International Scientific Research, Ministry of Higher Education in Japan, Joint Research Project at the Faculty of Economics, Hiroshima University of Economics, Research Topic: Theoretical and Empirical Study on Pattern of Economic Development in Asian Countries and Japan’s Economic Cooperation, 1991-1994 |
| 3 | 文部省国際学術共同研究、佐賀大学経済学部、研究題目：東アジアにおける日本と中国の経済的役割に関する研究 (１９９１年～１９９５).
Grant-in-Aid for International Joint Research Project, Ministry of Higher Education in Japan, Research Topic: The Economic Role of Japan and China in the East Asia Region, Joint Research Grant, The Promotion and Mutual Aid Corporation for Private Universities of Japan, 1991-1995 |
| 4 | 科学研究費補助金（総合研究Ａ）、東京大学農学部農業経済学科での共同研究、研究題目：農法展開の比較史的研究、(１９９２年～１９９８)、
Grant-in-Aid for Scientific Research (Comprehensive Research A), Joint Research Project at the Department of Agricultural Economics, Faculty of Agriculture, University of Tokyo, Research Topic: A Comparative Study on the Development History of Agricultural Methods, 1992-1998 |
| 5 | 国際協力事業団（JICA）、スリランカ研究協力「参加型農村開発方法の確立」、(１９９８年～２００１).
Japan International Cooperation Agency (JICA), Sri Lanka Research Cooperation, Research Topic: Action-oriented Research for Participatory Rural Development in Sri Lanka, (1998-2001). |
| 6 | 文部省国際学術研究、研究題目：アジアにおける農業の近代化の地域社会的影響と持続可能な発展方向の模索的事例研究、(２００３年～２００６年).
Grant-in-Aid for International Joint Research Project, Ministry of Higher Education in Japan, Research Topic: Agricultural Modernization, its Impact on Regional Economies and Ways for Sustainable Development in Asia: A Study of Selected Cases in Japan, Thailand and Sri Lanka, 2003-2006 |