1. Sr. Civ. Engrg. Asst.; Bureau of Engrg., Dept. of Public Works, City of Los Angeles, Los Angeles, Calif.; formerly, Grad. Student, Univ. of California, Irvine, Calif.
2. Assoc. Prof. of Mech. and Environmental Engrg.; School of Engrg., Univ. of California, Irvine, Calif.