1. Research Administrative Division OMRON SINIC X Corporation 5-24-5 3F Hongo, Bunkyo-ku 113-0033 Tokyo Japan
2. Graduate School of Information Science and Technology The University of Tokyo 7-3-1 Hongo, Bunkyo-ku 113-8656 Tokyo Japan
3. Department of Physics and Electronics Osaka Prefecture University 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531 Osaka Japan