1. Department of Business Administration, Sejong University, Seoul, South Korea
2. Korea Electronics Technology Institute (KETI), Gyeonggi-do, South Korea
3. Laboratory for Investment and Financial Engineering, Department of Engineering Management and Systems Engineering, Missouri University of Science and Technology, Rolla, MO, USA
4. Graduate School of MOT, Sogang University, Seoul, South Korea
5. Department of Information and Industrial Engineering, Yonsei University, Seoul, South Korea