https://blog.gongquiz.com/2021/02/24/%eb%aa%a8%eb%9e%84-%ec%84%9c%eb%b2%a0%ec%9d%b4morale-survey%ec%9d%98-%ec%a3%bc%ec%9a%94-%eb%b0%a9%eb%b2%95-%ec%a4%91-%ed%83%9c%eb%8f%84%ec%a1%b0%ec%82%ac%eb%b2%95%ec%97%90-%ed%95%b4%eb%8b%b9/