1. Ph.D. Candidate, Dept. of Civil Engineering, New Mexico State Univ., Ed & Harold Foreman Bldg., Room 238, MSC 3566, P.O. Box 30001, Las Cruces, NM 88003 (corresponding author).
2. Professor, Dept. of Engineering Technology and Surveying Engineering, New Mexico State Univ., Las Cruces, NM 88003.
3. Professor, College of Continuing Education, North China Univ. of Technology, Beijing 100041, China.