1. Department of Intelligent Media Engineering and the Department of Information and Communication Engineering, Hanbat National University, Daejeon, South Korea
2. Department of Computer Engineering, Hanbat National University, Daejeon, South Korea
3. School of Electrical, Electronic Communication, and Computer Engineering, Chonnam National University, Yeosu-si, South Korea
4. School of Electrical Engineering, College of Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea