1. Department of Mechanical Engineering, Hsiuping University of Science and Technology, No.11 Gongye Rd., Dali Dist., Taichung City 412-80, Taiwan, R.O.C.
2. Department of Electromechanical Engineering, University of Macau, Avenida Padre Tomás Pereira, Taipa, Macau, P. R. China
3. Department of Mechanical Engineering, Chung Hua University, 707, Sec. 2, WuFu Rd., Hsinchu, Taiwan 30012, R.O.C.