1. Research Assistant Professor and Lecturer, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 490 Town Engineering, Ames, IA 50011-3232.
2. Associate Professor, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 406 Town Engineering, Ames, IA 50011-3232.
3. Assistant Professor, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 476 Town Engineering, Ames, IA 50011-3232.