1. Formerly, Graduate Research Assistant, Univ. of Idaho, 875 Perimeter Dr., Moscow, ID 83844-1022.
2. Graduate Research Assistant, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 174 Town Engineering, Ames, IA 50011; Lecturer Assistant, Dept. of Construction and Building, Arab Academy for Science and Technology, Cairo, Egypt.
3. Assistant Professor, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 426 Town Engineering, Ames, IA 50011 (corresponding author).