This author has not been identified. Look up 'Ga Yang Shim' in GoogleThis author has not been identified. Look up 'Eun-Hye Kim' in GoogleThis author has not been identified. Look up 'Yun Jeong Baek' in GoogleThis author has not been identified. Look up 'Won Kee Chang' in GoogleThis author has not been identified. Look up 'Bo-Ram Kim' in GoogleThis author has not been identified. Look up 'Joo Han Oh' in GoogleThis author has not been identified. Look up 'Jong-In Lee' in GoogleThis author has not been identified. Look up 'Ji Hye Hwang' in GoogleThis author has not been identified. Look up 'Jae Young Lim' in Google