1. School of Management Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea;
2. Investment Policy Division, National Pension Research Institute of Korea, South Korea;
3. Industrial and Management Systems Engineering, Kyung Hee University, Yongin-si, Gyeonggi-do, South Korea;
4. Financial Business Division, NICE Information Service, South Korea;
5. Industrial and Systems Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea