1. Department of Computer Science & Artificial Intelligence, Jeonbuk National University, Jeonju, South Korea
2. School of Computer Science and Engineering, Korea University of Technology & Education, Cheonan, South Korea
3. Dabeeo Inc., Seoul, South Korea
4. Department of Electrical Engineering and Computer Science, The Interdisciplinary Studies of Artificial Intelligence, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, South Korea