1. Graduate Student, Dept. of Building and Construction, City Univ. of Hong Kong, Tat Chee Ave., Kowloon, Hong Kong.
2. Associate Professor, Dept. of Civil and Architectural Engineering, Illinois Institute of Technology, 3201 South Dearborn St., Chicago, IL 60616.
3. Associate Professor, Dept. of Building and Construction, City Univ. of Hong Kong, Tat Chee Ave., Kowloon, Hong Kong.