1. Associate Professor, Dept. of Building, National Univ. of Singapore, 4 Architecture Dr., Singapore 117566.
2. Ph.D. Student, Dept. of Architecture, National Univ. of Singapore, 4 Architecture Dr., Singapore 117566 (corresponding author).
3. Assistant Professor, Dept. of Building and Construction, City Univ. of Hong Kong, Tat Chee Ave., Kowloon Tong, Hong Kong.