Keiichi Endo, Gakuto Fujioka, Ayame Onoyama, Dai Okano, Yoshinobu Higami, Shinya Kobayashi. Evaluation of educational applications in terms of communication delay between tablets with Bluetooth or Wi-Fi Direct. Vietnam. J. Comput. Sci. 2018. 5. 3-4. 219-227
Keiichi Endo, Ayame Onoyama, Dai Okano, Yoshinobu Higami, Shinya Kobayashi. Comparative evaluation of bluetooth and Wi-Fi direct for tablet-oriented educational applications. Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics). 2017. 10191 LNAI. 345-354
Keiichi Endo, Ryoki Horio, Dai Okano. A Ranking Algorithm for Mitigating the Influence of Contrived Ratings on Review Sites. Computer Science and Information Technology. 2015. 3. 6. 256-263