Adaptive embodied entrainment control based on communication activity measurement - A challenge for a robotic introducer agent -. - Kenzaburo Miyawaki; Mutsuo Sano; Yoshinari Teramoto; Tatsuya Hayamizu; Kentaro Mukai; Masao Kawano; Ryohei Sasama; Hirohiko Ito; Tomoharu Yamaguchi; Keiji Yamada (ICARA, 2009)