Keio Leading-edge Laboratory of Science and Technology [KLL] 3-14-1 Hiyoshi Kohoku-ku Yokohama-shi Kanagawa 223-8522, Japan TEL　045-566-1470 FAX　045-566-1471 E-mail　ktm@kll.keio.ac.jp URL　http://www.kll.keio.ac.jp/