1. Assistant Professor, Univ. of Missouri Columbia, E2503 Lafferre Hall, Columbia, MO 65211.
2. Professor, Dept. of Civil Engineering, Cockrell School of Engineering, The Univ. of Texas at Austin, 1 University Station C1700, Austin, TX 78712.
3. Associate Professor, Dept. of Civil Engineering, Cockrell School of Engineering, The Univ. of Texas at Austin, 1 University Station C1700, Austin, TX 78712.