Space+a: participating audience on performance stage. - Ryohei Takagi; Kosuke Kazato; Suzuki Shugo; Naohito Okude (Advances in Computer Entertainment Technology, 2008)

munica: an advancing age's social networking device with greeting cards. - Kazuhiko Koriyama; Mizuki Namai; Kosuke Kazato; Naohito Okude (SIGGRAPH Posters, 2008)