- Tomoyuki Ishida
Ibaraki University, Hitachi, Ibaraki 3168511 Japan
ishida@mx.ibaraki.ac.jp - Kazuhiro Takahagi
Ibaraki University, Hitachi, Ibaraki 3168511 Japan
14nm712y@vc.ibaraki.ac.jp - Akira Sakuraba
Iwate Prefectural University, Takizawa, Iwate 0200693 Japan
g236k001@s.iwate-pu.ac.jp - Noriki Uchida
Saitama Institute of Technology, Fukaya, Saitama 3692093 Japan
uchida@sit.ac.jp - Yoshitaka Shibata
Iwate Prefectural University, Takizawa, Iwate 0200693 Japan
shibata@iwate-pu.ac.jp