1. Dr. of Civil Engineering, Swiss Federal Institute of Technology, School of Architecture and Civil and Environmental Engineering, Maintenance and Safety of Structures Division (MCS), CH 1015 Lausanne, Switzerland.
2. Visiting Professor, Dr. of Systems Engineering, Dept. of Electrical and Systems Engineering, Univ. of Pennsylvania, 220 South 33rd Street, 270 Towne Building, Philadelphia, PA 19104-6315.
3. Professor, Dr. of Civil Engineering, Swiss Federal Institute of Technology, School of Architecture, Civil and Environmental Engineering, Maintenance and Safety of Structures Division (MCS), CH 1015 Lausanne, Switzerland.