Affiliation: | 1. Department of Computer Engineering, KyungHee University, 1732 Deokyoungdae-ro, Giheung-gu, Yongin-si, Gyeonggi-do, 446-701, Korea 2. School of Computer Information Engineering, Sangji University, Usan-dong, Wonju-si, Gangwon-do, 220-702, Korea 3. Division of Information & Communication, Baekseok University, 115 Anseo-dong, Cheonan-si, Chungnam-do, 330-704, Korea
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