Utilization of Bio-Signals to Understand the Physiological States of e-Learners and Improve the Learning Contents. - C. M. Althaff Irfan; Shusaku Nomura; Takaoi Yamagishi; Yoshimasa Kurosawa; Kuniaki Yajima; Katsuko T. Nakahira; Nobuyuki Ogawa; Yoshimi Fukumura (IEICE Trans. Inf. Syst., 2011)