Yong Xu Yoshimasa Ohmoto Kazuhiro Ueda Takanori Komatsu Takeshi Okadome Koji Kamei Shogo Okada Yasuyuki Sumi Toyoaki Nishida Active adaptation in human-agent collaborative interaction. 23-38 2011 37 J. Intell. Inf. Syst. 1 http://dx.doi.org/10.1007/s10844-010-0135-2 db/journals/jiis/jiis37.html#XuOUKOKOSN11