1. Department of Computer and Information Security, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea
2. Division of Convergence Computer & Media, Mokwon University, Deajeon, Republic of Korea
3. Advanced Image and Information Technology, School of Electronics & Information Engineering, Chonbuk National University, 664-14 1Ga, Deokjin-Dong, Jeonju 561-756, Republic of Korea
4. Department of Mathematics and Computer Science, Northeastern State University, 611 N. Grand Ave No. 323, Webb Center, Tahlequah, OK 74464, USA