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한국산학기술학회논문지, v.15, no.7, pp.4416 - 4422, 2014
한국산학기술학회논문지, v.15, no.7, pp.4272 - 4278, 2014
한국산학기술학회논문지, v.15, no.6, pp.3799 - 3804, 2014