https://www.syu.ac.kr/grad/2021%ed%95%99%eb%85%84%eb%8f%84-1%ed%95%99%ea%b8%b0-%ea%b5%ad%eb%af%bc%eb%8c%80%ed%95%99%ea%b5%90-%ed%95%99%ec%a0%90%ea%b5%90%eb%a5%98-%ec%8b%a0%ec%b2%ad-%ec%95%88%eb%82%b4-2/