1. Associate Member, ASCE
2. Grad. Student, Nat. Subsurface Envir. Res. Lab. (NSERL), Ewha Womans Univ., 11-1 Daehyon-dong, Seodaemun-gu, Seoul 120-750, Korea.
3. Assoc. Prof., Nat. Subsurface Envir. Res. Lab. (NSERL), Ewha Womans Univ., 11-1 Daehyon-dong, Seodaemun-gu, Seoul 120-750, Korea.