1. Ph.D. Candidate, School of Naval Architecture, Ocean and Civil Engineering and State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong Univ., 800 Dongchuan Rd., Shanghai 200240, P.R. China.
2. Professor, School of Naval Architecture, Ocean and Civil Engineering and State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong Univ., 800 Dongchuan Rd., Shanghai 200240, P.R. China (corresponding author).
3. Assistant Professor, School of Civil and Environmental Engineering, Rutgers, State Univ. of New Jersey, 96 Frelinghuysen Rd., Piscataway, NJ 08854.