1. Energy Mechanics Center, Korea Institute of Science and Technology, Seoul 130-650, Korea
2. Samsung C&T Cooperation 1321-20, 21st Floor Samsung Corporation Bldg, Seocho 2-Dong Seocho-Gu, Seoul 137-857, Korea
3. School of Fire and Disaster Prevention, Kangwon National University, 253 Gyo-Dong, Samcheok, Gangwon-Do 245-711, Korea