This author has not been identified. Look up 'Jeonghun Ku' in GoogleThis author has not been identified. Look up 'Hee Jeong Jang' in GoogleThis author has not been identified. Look up 'Kwanguk Kim' in GoogleThis author has not been identified. Look up 'Sung Hyouk Park' in GoogleThis author has not been identified. Look up 'Jae-Jin Kim' in GoogleThis author has not been identified. Look up 'Chan-Hyung Kim' in GoogleThis author has not been identified. Look up 'Sang-Won Nam' in GoogleThis author has not been identified. Look up 'In-Young Kim' in GoogleThis author has not been identified. Look up 'Sun I. Kim' in Google