https://www.syu.ac.kr/grad/2021-%ea%b3%a0%ec%b0%bd%ed%95%99-%ec%97%b0%ea%b5%ac-%ec%9a%b0%ec%88%98%eb%85%bc%eb%ac%b8-%ea%b3%b5%eb%aa%a8%ec%a0%84-%ed%99%8d%eb%b3%b4-%ed%98%91%ec%a1%b0-%ec%9a%94%ec%b2%ad/3-%ea%b3%b5%eb%aa%a8%ec%a0%84-%ec%9b%b9%ed%8f%ac%ec%8a%a4%ed%84%b0/