2020 - 2023 Effects of class hierarchy on bullying-bystander behavior
2011 - 2015 Developmental research of Japanese comprehensive school guidance and counseling approach and teacher trainning program
2009 - 2014 Developing the International Understanding Education Curriculum by Interactively Implementing the Lesson Study with both Teachers in Japan and the United States
2010 - 2012 Construction and Evaluation of a Sharing System of Experienced Art Teachers' Knowledge and Skills for Elementary and Secondary Schools
2008 - 2011 The reconstruction of"craft education"of elementary and junior high school in Japan
2004 - 2005 教育職員の業績に応じた人事評価システムの構築
2004 - 2005 我が国の自然科学教育の原点を東奥義塾の教育実践に探る萌芽的研究
2002 - 2004 Research on educational effects of children exchange among different school levels.
1997 - 2000 Factors affecting help-seeking behaviors by junior highschool students in crisis situation
1998 - 1999 Social psychological study of the structure and the functions of extended self.
1995 - 1996 Social psychological study of the structure and the functions of material self
Cai, Y, Kohyama, T. Relationship between proactive coping and college graduates' appraisal and mental health prior to organization entry. North American Journal of Psychology. 2018. 20. 529-544
Cai, Y, Kohyama T. Effects of proactive coping on workplace adaptation after transition from college to workplace. International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering. 2013. 17. 3. 366-369
Relationship between social anxiety and stress coping: A study of measuring undergraduate students anxiety of teachers. In R.Roth, C.Hiew, & A.-L.Comunian(Eds.), <i> Peace, Hope, and Well-Being across the Cultures.
Shaker Verlag. pp.121-130. 2009