1. Postdoctoral Research Associate, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
2. Senior Researcher, Korea Water Resources Corporation, Daejeon, 306-711 Korea.
3. Assistant Professor, Dept. of Agricultural Engineering, Kangwon National Univ., Gangwon-do, 200-701 Korea.
4. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801 (corresponding author).