1. Faculty of Science and Engineering, Chuo University, Bunkyo-ku, Tokyo 112-8551, Japan
2. Faculty of Engineering, Kogakuin University, Hachioji, Tokyo 192-0015, Japan
3. Graduate School of Fine Arts, Tokyo University of the Arts, Taito-ku, Tokyo 110-8714, Japan
4. Faculty of Engineering, Yamagata University, Yonezawa, Yamagata 992-8510, Japan