Affiliation: | 1. Department of Interaction Science, Sungkyunkwan University, 25-2, Sungkyunkwan-ro, Jongno-gu, Seoul, 110-745, South Korea 2. Department of Management Engineering, Sangmyung University, 31 Sangmyungdae-gil, Dongnam-gu, Cheonan-si, Choongnam, 330-720, South Korea
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