1. M.Sc., Dept. of Civil Engineering, Faculty of Engineering, Zanjan Univ., P.O. Box 313-45195, Zanjan, Iran; formerly, Project Officer, Dept. of Civil Engineering, Sazeh-Ara Research Center, Sattarkhan Ave., Tehran, Iran (corresponding author).
2. Ph.D. student, Dept. of Industrial Engineering, College of Engineering, Univ. of Tehran, P.O. Box 11155/4563, Tehran, Iran.
3. M.Sc., School of Industrial Engineering, Islamic Azad Univ.—South Tehran Branch, P.O. Box 11365/4435; and Planning and Project Control Dept., IPMI Company, Vali-e-asr Ave., Tehran, Iran.