1. Department of Automobile Eng.; Seojeong College; 681-1 Yongam-Ri Eunhyeon-Myun, Yangjoo-City, Gyeonggi-do 482-777 Korea
2. Korea Institute of Industrial Technology; 30 Goahakdan 1-Ro, 60 Beon-Gil Gangseo-gu, Busan 618-230 Korea
3. Department of Mechatronics Eng.; Tongmyong University; Busan 608-711 Korea