Ryuhei Tsuji，1999/2，”Accuracy of Prediction in PD Games and Trust in Group,” Sunbelt 19: International Sunbelt Social Network Conference, 於Charleston, SC, USA
Ryuhei Tsuji，2000/6，”A Dynamic Model of Attitude Change in Group,” Mathematical Sociology in Japan and in America: 1st Joint Conference, 於Honolulu, HI, USA
Ryuhei Tsuji，2001/8，”A Model of Group Polarization and Effects of Social Networks,” Mathematical Sociology Regular Session, 96th American Sociological Association Annual Meeting, 於Anaheim, CA, USA
Ryuhei Tsuji，2002/5-6，”Estimating Acquaintanceship Volume in Japan and US,” Mathematical Sociology in Japan and in America: 2nd Jont Conference, 於Vancouver, BC, Canada
Motoko Harihara and Ryuhei Tsuji，2002/5-6，”Which is Adaptive, Self-enhancement or Self-effacement?: A Mathematical Model of Self-presentation,” Mathematical Sociology in Japan and in America: 2nd Jont Conference, 於Vancouver, BC, Canada
Ryuhei Tsuji ，2002/8，”Social Order in Large Networks: An Application of Watts’ Small World Simulation,” Mathematical Sociology Regular Session: 97th American Sociological Assoication Annual Meeting, 於Chicago, IL, USA
Ryuhei Tsuji and Motoko Harihara，2004/8，”A Model of Japanese Self-Effacement: Information Flow and Self-Effacing Presentation,” Social Psychology Roundtables, 99th American Sociological Association Annual Meeting, 於San Francisco, CA, USA
Ryuhei Tsuji and Motoko Harihara，2006/7，”Comparison of the Acquaintanceship Volume in Japan and the United States,” 18th International Congress of IACCP, 於Spetses Island, Greek
Motoko Harihara and Ryuhei Tsuji，2006/7，”The Effect of Social Networks on Modest Self-Presentation among Japanese: Comparison of Rural and Urban Area,” 18th International Congress of IACCP, 於Spetses Island, Greek
Ryuhei Tsuji and Azusa Isobe，2008/5-6，”Closeness and Trust of Japanese Junior High School Students,” 4th Joint Japan-North America Mathematical Sociology Conference, 於Redondo Beach, CA, USA
Ryuhei Tsuji and Koji Hasegawa，2010/7，”Social Capital of Volunteers of a Classical Music Festival: How Is It Related with Participation in Other Events and Actvities,” Sunbelt 30: International Sunbelt Social Network Conference, Riva del Garda, Italy
Ryuhei Tsuji，2012/8，”Effect of General Trust and General Tolerance on Voting Behavior and Political Interests,” The Fifth Joint Japan-North America Mathematical Sociology Conference, 於Denver, CO, USA
Ryuhei Tsuji，2014/7，”Examining the chain relationship from initial contact to classical music to socio-economic status via music preference,” 18th ISA World Congress of Sociology, 於Pacifico Yokohama
Ryuhei Tsuji, 2015/6, “Museum Visiting Networks: Differences in Visiting Patterns between Citizens and Visitors,” Sunbelt 35: International Sunbelt Social Network Conference, 於Hilton Brighton Metropole Hotel, UK
Ryuhei Tsuji, 2016/4, “Network Locations and Political Orientations in Japan,” Sunbelt 36: International Sunbelt Social Network Conference, Newport Beach, CA, USA
Ryuhei Tsuji and Namie Nagamatsu, 2020/7, “Forty-Years Change of Dimensionality of Occupational Evaluation in Japan,” Sunbelt 40: International Sunbelt Social Network Conference, Paris, France (Online)
Ryuhei Tsuji, 2022/7, “Opposite peer pressure of COVID-19 vaccination in Japan,” Sunbelt 42: International Sunbelt Social Network Conference, Cairns, Australia (Hybrid, participated online)
Ryuhei Tsuji, Shinichi Aizawa, Tsunehide Chino, Tomoe Hamazaki, 2024/6, “Who participates in the Ombashira Festival?: Participants’ networks and social stratifications,” Sunbelt 44: International Sunbelt Social Network Conference, 於Edinburgh, Scotland
