1. Assistant Professor, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Kansas, 2150, Learned Hall, 1530 W. 15th, St., Room 2134-C, Lawrence, KS 66045-7609 (corresponding author). E-mail: oswald@ku.edu
2. Professor, Dept. of Building, School of Design and Environment, National Univ. of Singapore, Singapore 117566. E-mail: bdglowsp@nus.edu.sg