https://www.syu.ac.kr/sw/2016%eb%85%84-1%ed%95%99%ea%b8%b0-%ed%95%99%ea%b8%b0%ec%a4%91-%ec%8b%a4%ec%8a%b5-%eb%a7%88%ed%8f%ac%ec%9e%a5%ec%95%a0%ec%9d%b8%ec%a2%85%ed%95%a9%eb%b3%b5%ec%a7%80%ea%b4%80/