1. Faculty of General Education, Ehime University, Matsuyama, Ehime 790
2. Science and Engineering Research Lab., Waseda University, Shinjuku, Tokyo 162
3. Faculty of Science, Ehime University, Matsuyama, Ehime 790
4. Faculty of Engineering, Kanagawa University, Kanagawaku, Yokohama 221
5. Faculty of Science, Rikkyo University, Ikebukuro, Tokyo 171