1. Research Professor, Dept. of Environmental Engineering, Univ. of Seoul, Seoul, Republic of Korea.
2. Visiting Scholar, Division of Construction Engineering and Management, Purdue Univ., West Lafayette, IN.
3. President, Water Resource Engineering Corporation, Daejeon, Republic of Korea.
4. Professor, Dept. of Environmental Engineering, Jeju Nation Univ., Jeju-do, Republic of Korea.
5. Professor, Dept. of Environmental Engineering, Univ. of Seoul, Seoul, Republic of Korea.