https://www.syu.ac.kr/grad/2016%eb%85%84%eb%8f%84-1%ec%b0%a8%e3%80%8e%eb%8c%80%ed%95%99-%ea%b8%80%eb%a1%9c%eb%b2%8c-%ed%98%84%ec%9e%a5%ed%95%99%ec%8a%b5%e3%80%8f%eb%aa%a8%ec%a7%91-%ea%b3%b5%ea%b3%a0/