1. Associate Professor, Dept. of Finance and Operations Management, Univ. of Tulsa, Tulsa, OK 74104; formerly, Dept. of Engineering Management and Systems Engineering, Univ. of Missouri, Rolla, MO 65409-1330. E-mail: david-enke@utulsa.edu
2. Graduate Research Assistant, Dept. of Engineering Management and Systems Engineering, Univ. of Missouri, Rolla, MO 65409-1330. E-mail: cttz4@umr.edu
3. Associate Professor, Dept. of Civil, Architectural and Environmental Engineering, Univ. of Missouri, Rolla, MO 65409-1330 (corresponding author). E-mail: rluna@umr.edu