Division of Information System Design, Tokyo Denki University, Hatoyama, Hiki, Saitama, Japan. zzchen@mail.dendai.ac.jp|Division of Information System Design, Tokyo Denki University, Hatoyama, Hiki, Saitama, Japan. zzchen@mail.dendai.ac.jp|Division of Information System Design, Tokyo Denki University, Hatoyama, Hiki, Saitama, Japan. zzchen@mail.dendai.ac.jp