1. Department of Innovative Design and Entrepreneurship Management, Far East University, Tainan 744, Taiwan, R. O. C.
2. Department of Mold and Die Engineering, National Kaohsiung University of Applied Science, Kaohsiung City, 807 Taiwan, R. O. C.
3. Department of Engineering Science, National Cheng Kung University, East Dist., Tainan 701, Taiwan, R. O. C.