1. Assistant Professor, Dept. of Building and Construction, City Univ. of Hong Kong, Tat Chee Ave., Kowloon Tong, Hong Kong.
2. Teacher, School of Economic Information Engineering, Southwestern Univ. of Finance and Economics, Liutai Ave. 555, Wenjiang District, Chengdu, P.R.C.
3. School of Economics and Commerce, South China Univ. of Technology, University Mega Center, Panyu District, Guangzhou, P.R.C.