1. National Assembly Futures Institute, 1 Uisadang-daero, Yeongdeungpo-gu, Seoul 07233, Republic of Korea
2. Department of Economics, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea
3. Technology Management, Economics, and Policy Program, College of Engineering, Seoul National University, Technology Management, Economics and Policy Program, Seoul National University, Gwanak-gu, Seoul 151-742, Republic of Korea