1. Dept. of Industrial Engineering, Univ. of Louisville, Louisville, KY 40292, US (Corresponding author), e-mail: usher@louisville.edu
2. Dept. of Statistics, Faculty of Sciences, King Abdulaziz Univ., Jeddah 21551, SA, e-mail: aslam_ravian@hotmail.com
3. Dept. of Industrial Engineering, Univ. of Louisville, Louisville, KY 40292, US, e-mail: cthard01@exchange.louisville.edu
4. Dept. of Industrial and Management Engineering, POSTECH, Pohang 790-784, KR.