참조 : http://seoulhumanitiesforum.org/2015-%ec%88%98%ec%9a%94%ed%8f%ac%eb%9f%bc%ec%9d%b8%eb%ac%b8%ec%9d%98%ec%88%b2yef-%ea%b5%ad%eb%82%b4%ed%95%99%ec%88%a0%ed%83%90%eb%b0%a9-%ec%97%ad%ec%82%ac%ec%9d%98%ec%84%ac-%ea%b0%95%ed%99%94-2/?cat=3/