1. Department of Mathematics, Sungkyunkwan University, Suwon, Republic of Korea
2. Department of Financial Engineering, Ajou University, Suwon, Republic of Korea
3. Samsung Securities, 11 Seocho-daero 74-gil, Seocho-gu, Seoul, Republic of Korea
4. Department of Mathematical Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea