1. Advanced Institute of Manufacturing With High-Tech Innovations, National Chung Cheng University, Ming-Hsiung, Chia-Yi 621, Taiwan;
2. Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802 e-mail:
3. Advanced Institute of Manufacturing With High-Tech Innovations, National Chung Cheng University, Ming-Hsiung, Chia-Yi 621, Taiwan e-mail: