1. Ph.D. Student, Dept. of Mechanical and Industrial Engineering, 3131 Seamans Center, Univ. of Iowa, Iowa City, IA 52242.
2. Professor and Chair, Dept. of Mechanical and Industrial Engineering, 3131 Seamans Center, Univ. of Iowa, Iowa City, IA 52242 (corresponding author).
3. M.S. Student, Dept. of Mechanical and Industrial Engineering, 3131 Seamans Center, Univ. of Iowa, Iowa City, IA 52242.