1. CEO, Cast ConneX Corporation, MaRS Centre, Heritage Bldg., 101 College St., Suite 320, Toronto, ON, Canada M5G 1L7.
2. Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Toronto, ON, Canada M5S 1A4 (corresponding author).
3. Associate Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Toronto, ON, Canada M5S 1A4.