1. Prof. of Civ. Engrg. and Mechanics, Drexel Inst. of Technology, Philadelphia, Pa.
2. Assoc. Prof. of Civ. Engrg., and Mechanics, Drexel Inst. of Technology, Philadelphia, Pa.
3. Asst. Prof. of Civ. Engrg., Dept. of Water Resource Engrg., Philadelphia, Pa.