- Kazuhiro Takahagi
Ibaraki University, Hitachi, Ibaraki 3168511 Japan
14nm712y@vc.ibaraki.ac.jp - Tomoyuki Ishida
Ibaraki University, Hitachi, Ibaraki 3168511 Japan
tomoyuki.ishida.49@vc.ibaraki.ac.jp - Akira Sakuraba
Iwate Prefectural University, Takizawa, Iwate 0200693 Japan
g236k001@s.iwate-pu.ac.jp - Kaoru Sugita
Fukuoka Institute of Technology, Higashi-ku, Fukuoka 8110295 Japan
sugita@fit.ac.jp - Noriki Uchida
Fukuoka Institute of Technology, Higashi-ku, Fukuoka 8110295 Japan
n-uchida@fit.ac.jp - Yoshitaka Shibata
Iwate Prefectural University, Takizawa, Iwate 0200693 Japan
shibata@iwate-pu.ac.jp