1. Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong (corresponding author).
2. Assistant Professor, College of Civil Engineering, Fuzhou Univ., 350116 Fujian, China; formerly, Ph.D. Student, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong.
3. Professor, Dept. of Electrical Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong.