https://www.syu.ac.kr/rnd/%eb%8f%99%eb%82%a8%eb%b3%b4%ea%b1%b4%eb%8c%80%ed%95%99%ea%b5%90-%eb%b3%b4%ea%b1%b4%ec%9c%b5%ed%95%a9%ec%97%b0%ea%b5%ac-%ec%a0%9c42%ea%b6%8c-%ec%a0%9c2%ed%98%b8-%eb%85%bc%eb%ac%b8-%eb%aa%a8%ec%a7%91-2/