1. Associate Professor, Dept. of Construction Engineering, École de Technologie Supérieure, 1100 rue Notre-Dame Ouest, Montreal, QC, Canada H3C 1K3; presently, Associate Professor, Dept. of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, P.O. 6079, Station Centre-ville, Montreal, QC, Canada H3C 3A7.