참고자료
네트워크 커뮤니티 탐지 : https://statkclee.github.io/network/ml-network-communities.html
[withR]소셜네트워크분석 — subgroup(부그룹)](https://medium.com/excitinglab/withr-%EC%86%8C%EC%85%9C%EB%84%A4%ED%8A%B8%EC%9B%8C%ED%81%AC%EB%B6%84%EC%84%9D-subgroup-%EB%B6%80%EA%B7%B8%EB%A3%B9-834bf221b017)
Network Modularity (네트워크의 모듈성) : https://mons1220.tistory.com/93