1. Lecturer, Ocean College, Zhejiang Univ., 38 Zedha Rd., Hangzhou, Zhejiang 310058, China; formerly, Research Fellow, DHI-NTU Centre, NEWRI, Nanyang Technological Univ., 1 Cleantech Loop, Singapore 637141.
2. Associate Professor, Dept. of Ocean and Resources Engineering, School of Ocean and Earth Science and Technology, Holmes Hall 404, Univ. of Hawaii at Manoa, 2540 Dole St., Honolulu, HI 96822 (corresponding author).