https://blog.gongquiz.com/2022/09/16/%eb%b6%80%eb%8f%99%ec%9e%91-%ec%8b%9c%ea%b0%84dead-time-%ec%9a%94%ec%86%8c%ec%9d%98-%ec%a0%84%eb%8b%ac%ed%95%a8%ec%88%98%eb%8a%94-%ec%a0%84%ea%b8%b0%ea%b3%b5%ec%82%ac%ec%82%b0%ec%97%85%ea%b8%b0/