Affiliation: | 1. Institute of Information Science and Engineering Research, Mokpo National University, Dorim-ri, Cheonggye-myeon, Muan-gun, Mokpo, Jeollanam-do, 534-729, Korea 2. Department of Computer Education, Gyeongin National University of Education, Gyesan-Dong San 59-12, 45 Gyodae-Gil, Gyeyang-Gu, Incheon, 407-753, Korea 3. Department of Information and Electronics Engineering, Mokpo National University, Dorim-ri, Cheonggye-myeon, Muan-gun, Mokpo, Jeollanam-do, 534-729, Korea
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