Foreign Language Tutoring in Oral Conversations Using Spoken Dialog Systems 論文 Sungjin LEE・Hyungjong NOH・Jonghoon LEE・Kyusong LEE・Gary Geunbae LEE ·2012 ·『IEICE Transactions on Information and Systems』 E95.D(5) pp. 1216-1228 doi:10.1587/transinf.E95.D.1216