[1] Technical Center, Nitta Corporation, 172 Ikezawa-cho, Yamatokohriyama, Nara 639-1085, Japan
[2] Environmental Technology Research Division, Osaka Municipal Technical Research Institute, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan
[3] Faculty of Science and Engineering, Doshisha University, 1-3, Tatara Miyakodani, Kyotanabe, Kyoto 610-0321, Japan