Survey Research on Mobile Phone Market for Mobile-Learning in Japan. - Yoshiko Goda; Yuichi Kogure; Yukinari Shimoyama; Midori Kimura; Hiroyuki Obari (WMUTE, 2008)

Investigating the effectiveness of Prontest software to train English proficiency. - Hiroyuki Obari; Hiroaki Kojima; Machi Okumura; Masahiro Yoshikawa; Shuichi Itahashi (SLaTE, 2009)

Item Difficulty Analysis of English Vocabulary Questions. - Yuni Susanti; Hitoshi Nishikawa; Takenobu Tokunaga; Hiroyuki Obari (CSEDU (1), 2016)

Evaluation of automatically generated English vocabulary questions. - Yuni Susanti; Takenobu Tokunaga; Hitoshi Nishikawa; Hiroyuki Obari (Res. Pract. Technol. Enhanc. Learn., 2017)

Controlling item difficulty for automatic vocabulary question generation. - Yuni Susanti; Takenobu Tokunaga; Hitoshi Nishikawa; Hiroyuki Obari (Res. Pract. Technol. Enhanc. Learn., 2017)

Method of intonation conversion for facilitating English communication between native and non-native speakers. - Tomoko Nariai; Hiroaki Kojima; Hiroyuki Obari; Shiroh Itai (UV, 2018)

Automatic distractor generation for multiple-choice English vocabulary questions. - Yuni Susanti; Takenobu Tokunaga; Hitoshi Nishikawa; Hiroyuki Obari (Res. Pract. Technol. Enhanc. Learn., 2018)