| Affiliation: | 1. Graduate School of Information Systems, University of Electro-Communications, Chofugaoka 1-5-1, Chofu, Tokyo 182-8585, Japan;2. Department of Computer Science, Gunma University, Tenjin-cho 1-5-1, Kiryu, Gunma 376-8515, Japan;3. Department of Mathematical Sciences, Tokai University, Kitakaname 1117, Hiratsuka, Kanagawa, 259-1292, Japan;4. School of Information Science, Japan Advanced Institute of Science and Technology, Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan;5. Faculty of Integrated Media, Wakkanai Hokusei Gakuen University, Wakabadai 1-2290-28, Wakkanai, Hokkaido 097-0013, Japan |
