1. Division of Computer Science and Engineering, SunMoon University, Asan, South Korea
2. Department of Information and Communication Engineering, Hannam University, Daejeon, South Korea
3. Division of Computer and Information Engineering, Hoseo University, Asan, South Korea
4. Division of Computer Engineering, Hansung University, Seoul, South Korea
5. Artificial Intelligence Research Center, Korea Electronics Technology Institute, Seongnam, South Korea