1. Department of Materials Science and Engineering; Feng Chia University; Taichung 40724 Taiwan
2. Department of Electronic Engineering; Feng Chia University; Taichung 40724 Taiwan
3. ULVAC Taiwan Inc.; Hsinchu 30078 Taiwan
4. Helius Power Corp. Ltd.; Taichung 42881 Taiwan
5. PEGASUS Software Inc.; Tokyo 104-0032 Japan
6. Interdisciplinary Grauate School of Engineering Sciences; Kyushu University; Kasuga Fukuoka 816-8580 Japan