Links
[1] http://www.sdi.re.kr/%23
[2] http://facebook.com/sharer.php?u=http%3A%2F%2Fwww.sdi.re.kr%2Fnode%2F62950&t=%EC%84%9C%EC%9A%B8%EC%97%B0%EA%B5%AC%EC%9B%90%20%EC%9D%B8%EC%82%AC%20%EB%B0%9C%EB%A0%B9%282020.1.1.%EC%9E%90%29
[3] http://twitter.com/intent/tweet?url=http%3A%2F%2Fwww.sdi.re.kr%2Fnode%2F62950&text=%EC%84%9C%EC%9A%B8%EC%97%B0%EA%B5%AC%EC%9B%90%20%EC%9D%B8%EC%82%AC%20%EB%B0%9C%EB%A0%B9%282020.1.1.%EC%9E%90%29
[4] http://www.sdi.re.kr/si_download/62950/26335
[5] http://www.sdi.re.kr/paper