Affiliation: | (1) Department of Computer Science, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma, 376-8515 Japan, JP;(2) Department of Information Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, JP;(3) Computational Science Research Center, Hosei University, 3-7-2 Kajino-cho, Koganei City, Tokyo, 184-0002, Japan, E-mail: shigeo@cs.gunma-u.ac.jp, sinagawa@is.s.u-tokyo.ac.jp, tosi@kunii.com, JP |