https://www.syu.ac.kr/blog/2022-2-%ea%b3%b5%ea%b8%b0%ec%97%85-ncs%ec%a7%81%ec%97%85%ea%b8%b0%ec%b4%88%eb%8a%a5%eb%a0%a5%ed%8f%89%ea%b0%80-%ec%98%a8%eb%9d%bc%ec%9d%b8-%ec%8a%a4%ed%84%b0%eb%94%94-%ea%b5%90%ec%9c%a1-%ec%b0%b8/ncs-%ea%b0%95%ec%82%ac-%ec%86%8c%ea%b0%9c/