1. Department of Media and Communication, Konkuk University , 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, South Korea
2. Department of Communication, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea
3. Department of Broadcasting Regulation Research, Korea Information Society Development Institute , 1, Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea