1. Department of Applied Science, R.O.C. Naval Academy, Zuoying, Kaohsiung 813, Taiwan
2. Department of Electrical Engineering, Yuan Ze University, Zhongli, Taoyuan 320, Taiwan
3. Department of Chemical & Materials Engineering, Chung Cheng Institute of Technology, National Defense University, Dasi, Taoyuan 335, Taiwan
4. Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan