Affiliation: | a Division of Computer Science, Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-gu, Taejon 305-701, Republic of Korea b School of Electrical and Electronics Engineering, Chung-Ang University, 221, HukSuk-Dong, DongJak-Gu, Seoul 156-756, Republic of Korea |