Department of Computer Science and Intelligent Systems, Osaka Prefecture University
1-1 Gakuencho, Nakaku, Sakai, Osaka 599-8531, Japan;
ueno[at]ss.cs.osakafu-u.ac.jp
Naoki Mori
Department of Computer Science and Intelligent Systems, Osaka Prefecture University
1-1 Gakuencho, Nakaku, Sakai, Osaka 599-8531, Japan;
Keinosuke Matsumoto
Department of Computer Science and Intelligent Systems, Osaka Prefecture University
1-1 Gakuencho, Nakaku, Sakai, Osaka 599-8531, Japan;