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원문 _ https://blog.naver.com/PostView.nhn?blogId=kpfjra_&logNo=221352175359&redirect=Dlog&widgetTypeCall=true&fbclid=IwAR0HAlovyzufL1YeHSrBDJa7BkkZ5ll9Rmh9r0JGrCjtoPgYHMUSuJlztaM
원문 _ http://news.joins.com/article/22342090
원문 _ http://ttimes.kr/view.html?no=2017111917297721324&ref=face
원문 _ http://www.zdnet.co.kr/news/news_view.asp?artice_id=20171029225145