1. a CAD Laboratory School of Mechanical Engineering , Sungkyunkwan University , 300, Chunchun-dong Jangan-gu, Kyunggi-do, Suwon, Korea , 440-746
2. b Dept. of Industrial Automation System , Dongyang Technical College , 62-160 Kochuk-dong Kuro-gu, Seoul, Korea , 152-714
3. c Korea Institute of Science and Technology , National Research Laboratory (NRL) of Intelligent Process Planning , 39-1, Hawolgok-dong Sungbuk-gu, Seoul, Korea , 136-791