1. Jeju National University,Dept. of Computer Education,Jeju,Republic of Korea
2. Jeju National University,Dept. of Management Information Systems,Jeju,Republic of Korea
3. Chungnam National University,Dept. of Computer Science and Engineering,Daejeon,Republic of Korea
4. Jeju National University,Dept. of Computer Engineering,Jeju,Republic of Korea
5. Jeju National University,Major of Housing & Family Welfare(Faculty of Human Ecology & Welfare),Jeju,Republic of Korea
6. Jeju National University,Dept. of Computer Science & Statistics,Jeju,Republic of Korea
7. Purdue University,Dept. of Computer and Information Technology,West Lafayette,Indiana,USA