1. Department of Business Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao East Road, Taipei 10608, Taiwan
2. Program in Industrial and Systems Engineering, University of Minnesota, 111 Church St. SE, Minneapolis, MN 55455, USA
3. Reseach Center for Management Science and Information Engineering, School of Information Management and Engineering, Shanghai University of Finance and Economics, Shanghai 200433, China
4. Department of Business Administration, Chung Yuan Christian University, Chung-Li 320, Taiwan
5. School of Management, Tokyo University of Science, 500 Shimokiyoku, Kuki City, Saitama 346-8512, Japan