1. Associate Professor, Dept. of Civil Engineering, Univ. of Texas at El Paso, El Paso, TX.
2. Graduate Student, Dept. of Civil Engineering, Univ. of Texas at El Paso, El Paso, TX.
3. Professor, Dept. of Civil Engineering, Univ. of Texas at El Paso, El Paso, TX.
4. Professor, Civil and Environmental Engineering Dept., North Carolina A and T State Univ., McNair Hall Room 504, Greensboro, NC.