1. Department of Mechanical Engineering; Gifu University; 1-1 Yanagido Gifu 501-1193 Japan
2. Toyo Seiko Co., Ltd.; 3-195-1 Umaganji Yatomi-city Aichi 490-1412 Japan
3. Maruyasu Industries Co., Ltd.; 2-7-11 Shirakane, Showa-ku Nagoya-shi Aichi 466-0058 Japan