https://blog.gongquiz.com/2022/12/11/fmsflexible-manufacturing-system%ec%97%90%ec%84%9c-%ec%b6%94%ea%b5%ac%ed%95%98%eb%8a%94-%ec%83%9d%ec%82%b0-%eb%b0%a9%ec%8b%9d%ec%9d%80-%ec%84%a4%eb%b9%84%eb%b3%b4%ec%a0%84%ea%b8%b0%ec%82%ac-2014/