1. Ph.D. Candidate, Dept. of Civil Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia (corresponding author).
2. Research Fellow, Housing Research Centre, Dept. of Civil Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia.
3. Postdoctoral Fellow, Housing Research Centre, Dept. of Civil Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia.
4. Research Scholar, Dept. of Chemical Engineering, 313 Snell Engineering Centre, Northeastern Univ., 360 Huntington Ave., Boston, MA 02115; formerly, Postdoctoral Fellow, Dept. of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia.
5. Professor, Dept. of Civil Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia.