%282019-347%29 %EC%9D%B8%EC%82%AC%ED%98%81%EC%8B%A0%EC%B2%98_%EA%B3%B5%EB%AC%B4%EC%9B%90_%EC%A0%84%EC%9E%85%ED%9D%AC%EB%A7%9D%EC%9E%90 %EB%AA%A8%EC%A7%91 %EA%B3%B5%EA%B3%A0.pdf