1. Associate Research Fellow, National Center for Research on Earthquake Engineering, 200, Section 3, XinHai Rd., Taipei 106, Taiwan; formerly, NTU Ph.D. Student.
2. Director, National Center for Research on Earthquake Engineering, 200, Section 3, XinHai Rd., Taipei 106, Taiwan; Professor, Dept. of Civil Engineering, National Taiwan Univ. (corresponding author).
3. Associate Professor, Dept. of Civil and Environmental Engineering, Stanford Univ., Stanford, CA 94305.