1. Department of Industrial Engineering and Management, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
2. Department of Industrial Engineering and Management, Chaoyang University of Technology, Taichung 413, Taiwan
3. Department of Business Administration, Asia University, Taichung 413, Taiwan
4. Department of Mathematics, Computer Science & Engineering, Graphic Era Deemed to Be University, Dehradun 248002, India