1. Assistant Professor, Dept. of Civil Engineering, California State Polytechnic Univ., Pomona.
2. Graduate Student, Dept. of Civil Engineering, California State Polytechnic Univ., Pomona.
3. Associate Professor, Dept. of Civil Engineering, California State Polytechnic Univ., Pomona.
4. Professor, Dept. of Information, Risk, and Operations Management, Univ. of Texas at Austin.