1. Research Institute for Computer and Information Communication, Chungbuk National University, Cheongju, South Korea
2. Department of Computer Science and Engineering, Kongju National University, Cheonan, South Korea
3. Department of Computer Science and Engineering, Chungnam National University, Daejeon, South Korea
4. Department of Medical Information, Soonchunhyang University, Asan, South Korea
5. School of Information and Communications Engineering, Chungbuk National University, Cheongju, South Korea