1. Graduate Research Assistant, Dept. of Electrical and Computer Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
2. Postdoctoral Research Associates, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
3. Principle Research Engineer, Computer Vision and Robotics Laboratory, Beckman Institute, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
4. Associate, Trackbed Technology, AECOM, Nottingham, Nottinghamshire NG9 6RZ, U.K.
5. Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.