1. PhD Candidate, Dept. of Civil Engineering and Hazard Mitigation Research Center, National Chial Tung Univ., 1001 Ta Hsueh Rd., Hsinchu, 30050 Taiwan.
2. Professor, Dept. of Civil Engineering and Hazard Mitigation Research Center, National Chial Tung Univ., 1001 Ta Hsueh Rd., Hsinchu, 30050 Taiwan.