1. Assoc. Prof., Dept. of Civ. Engrg., Univ. of California, Berkeley, Calif., USA
2. Engr., Public Works Dept. of Western Australia, Australia
3. Sr. Lect., Dept. of Civ. Engrg., Univ. of Western Australia, Australia
4. Research Fellow, Dept. of Civ. Engrg., Univ. of Western Australia, Australia