1. Formerly, Doctoral Research Assistant, Dept. of Civil Engineering, 2118 Fiedler Hall, Kansas State Univ., Manhattan, KS 66506.
2. Professor and Head, Dept. of Civil Engineering, 2118 Fiedler Hall, Kansas State Univ., Manhattan, KS 66506.
3. Professor, Dept. of Chemical Engineering, 105 Durland Hall, Kansas State Univ., Manhattan, KS 66506.
4. Professor, Dept. of Civil Engineering, Korea Univ., Seoul 136-701, Korea.