출처 http://bruprin.tistory.com/entry/IT%EB%85%B8%ED%8A%B8%EB%B6%81-%EC%A0%84%EC%9E%90%EC%82%AC%EC%A0%84%EB%A7%8C%ED%95%9C-%EB%85%B8%ED%8A%B8%EB%B6%81PC-%EB%9D%BC%EC%98%A8%EB%94%94%EC%A7%80%ED%84%B8-%EC%97%90%EB%B2%84%EB%9F%B0-%EB%85%B8%ED%8A%B8
