1. Professor, Dept. of Mechanical and Automation Engineering, Chung Chou Univ. of Science and Technology, 51003 ChangHua, Taiwan, ROC (corresponding author).
2. Professor, Dept. of Mechanical Engineering, Texas A&M Univ. at Qatar, 23874 Doha, Qatar.
3. Professor, Dept. of Mechanical Engineering, Tatung Univ., 10452 Taipei, Taiwan, ROC.