http://www.kms.or.kr/home/kor/article/journal/abstract_view_detail.asp?articleuid=%7BA44B771B%2DE48D%2D44DE%2DBB14%2D35A7CC2117E5%7D&journalUID=%7B22A03670%2D9D51%2D4C19%2DA897%2D165E443CA6E2%7D&journalType=%7B20BE00F8%2D9926%2D448C%2D8BB0%2DB524B1C94157%