1. Associate Professor, Dept. of Civil Engineering, IIT Roorkee, Roorkee 247667, Uttaranchal, India.
2. A. K. Barton Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.
3. Rubicon Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.