1. Professor of Civil and Environmental Engineering, Dept. of Civil and Environmental Engineering, Univ. of Utah, 122 South Central Campus Drive, Ste 104 EMRO, Salt Lake City, UT 84112-0561 (corresponding author).
2. Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Utah, 122 South Central Campus Drive, Ste 104 EMRO, Salt Lake City, UT 84112-0561.
3. Chief Scientist, Air Logistics Corporation, 3600 E. Foothill Boulevard, Pasadena, CA 91107-6001.