1. a Department of Materials Engineering, National Ping-Tung University of Science and Technology, No. 1, Syuefu Rd., Neipu Township, Pingtung County 91201, Taiwan
2. b Department of Mechanical Engineering, National Ping-Tung University of Science and Technology, No. 1, Syuefu Rd., Neipu Township, Pingtung County 91207, Taiwan
3. c Department of Electronics Engineering and Computer Sciences, Tung-Fang Institute of Technology, No. 110, Tung-Fung Road, Hunei Shiang, Kaohsiung County 829, Taiwan
4. d Department of Mechanical Engineering, National Ping-Tung University of Science and Technology, No. 1, Syuefu Rd., Neipu Township, Pingtung County 91207, Taiwan;, Email: ryyang@mail.npust.edu.tw