1. Postdoctoral Associate, Center for Advanced Infrastructure and Transportation, Rutgers Univ., 100 Brett Rd., Piscataway, NJ 08854.
2. Christopher B. and Susan S. Burke Professor of Civil Engineering, Smart Sensors and NDT Laboratory, Dept. of Civil and Materials Engineering, Univ. of Illinois at Chicago, 842 W Taylor St., Chicago, IL 60607 (corresponding author).