This author has not been identified. Look up 'Kyung-Nam Park' in GoogleThis author has not been identified. Look up 'Jin-Hyeok Kang' in GoogleThis author has not been identified. Look up 'Byeong-Moon Cho' in GoogleThis author has not been identified. Look up 'Kyung-Joon Park' in GoogleThis author has not been identified. Look up 'Hwangnam Kim' in Google