https://www.syu.ac.kr/sw/2015%eb%85%84-%ec%a0%9c2%ea%b8%b0-%ed%95%98%ea%b3%84%eb%b0%a9%ed%95%99-%ec%a4%91-%ec%b2%ad%ec%86%8c%eb%85%84%ec%a7%80%eb%8f%84-%eb%b0%8f-%ec%82%ac%ed%9a%8c%eb%b3%b5%ec%a7%80-%ec%8b%a4%ec%8a%b5/