Information Extraction for Supporting a Learner's Efforts to Recognize What the Learner did not Understand. - Naoki Isogai; Ryo Nishimura; Yasuhiko Watanabe; Yoshihiro Okada (CSEDU (1), 2009)

Question classification considering answer types which questioners want. - Yuma Minemoto; Naoki Isogai; Ryo Nishimura; Yasuhiko Watanabe; Yoshihiro Okada (IADIS AC (2), 2009)