This author has not been identified. Look up 'Yong-Hoon Choi' in GoogleThis author has not been identified. Look up 'Jungerl Lee' in GoogleThis author has not been identified. Look up 'Juhoon Back' in GoogleThis author has not been identified. Look up 'Suwon Park' in GoogleThis author has not been identified. Look up 'Young-uk Chung' in GoogleThis author has not been identified. Look up 'Hyukjoon Lee' in Google