https://www.syu.ac.kr/sw/2015%eb%85%84-%ec%84%9c%ec%b4%88%ea%b5%ac%eb%a6%bd-%ec%96%91%ec%9e%ac%ec%a2%85%ed%95%a9%ec%82%ac%ed%9a%8c%eb%b3%b5%ec%a7%80%ea%b4%80-%ed%95%98%ea%b3%84%eb%b0%a9%ed%95%99-%ec%8b%a4%ec%8a%b5%ec%83%9d/