1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 1163 Glenn Martin Hall, College Park, MD 20742.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Michigan Technological Univ., 1400 Townsend Dr., Houghton, MI 49931.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 1163 Glenn Martin Hall, College Park, MD 20742 (corresponding author).
4. Graduate Research Assistant, Fischell Dept. of Bioengineering, 2334 Jeong H. Kim Engineering Building, Univ. of Maryland, College Park, MD 20742.