1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
2. Ph.D. Student, Dept. of Computer Science, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
3. Research Assistant Professor, School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea (corresponding author).
4. Newmark Endowed Chair in Civil Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
5. Professor, Dept. of Molecular and Integrative Physiology, The Beckman Institute for Advanced Science and Technology, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
6. Professor, Dept. of Computer Science, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.