1. a Research into Artifacts, Center for Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8568, Japan;, Email: gueta@race.u-tokyo.ac.jp
2. b Faculty of System Design, Tokyo Metropolitan University, 6-6, Asahigaoka, Hino-shi, Tokyo 191-0065, Japan
3. c Department of Precision Engineering, Graduate School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
4. d DENSO WAVE Inc., 1-1 Yoshiike, Kusaki, Agui-cho, Chita-gun, Aichi 470-2297, Japan
5. e Research into Artifacts, Center for Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8568, Japan