This author has not been identified. Look up 'Sung-Kwon Choi' in GoogleThis author has not been identified. Look up 'Hanmin Jung' in GoogleThis author has not been identified. Look up 'Chul-Min Sim' in GoogleThis author has not been identified. Look up 'Taewan Kim' in GoogleThis author has not been identified. Look up 'Dong-In Park' in GoogleThis author has not been identified. Look up 'Junsik Park' in GoogleThis author has not been identified. Look up 'Key-Sun Choi' in Google