https://skyjournals.org/%eb%8f%85%ec%b0%bd%ec%a0%81%ec%9d%b8-%eb%b3%80%ed%98%95-%eb%a7%88%ed%8b%b4%ea%b2%8c%ec%9d%bc-%ec%8b%9c%ec%8a%a4%ed%85%9c-%eb%b2%a0%ed%8c%85-%ec%b9%b4%ec%a7%80%eb%85%b8-%ea%b2%8c%ec%9e%84%ec%97%90/