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컴퓨터

21,999 bytes removed, 05:48, 16 November 2006
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<div style="overflow: auto; height: 1px;" id="kbektt12945"><p><strong>컴퓨터</strong>(<span style="fontFONT-sizeSIZE: small;"><a title="영어" href="http://ko.wikipedia.org/wiki/%EC%98%81%EC%96%B4">영어</a>:</span> <span lang="en" xml:lang="en">computer</span>, <span style="fontFONT-sizeSIZE: small;"><a title="문화어" href="http://ko.wikipedia.org/wiki/%EB%AC%B8%ED%99%94%EC%96%B4">문화어</a>:</span> <span lang="ko-KP" xml:lang="ko-KP"><strong>콤퓨터</strong></span>)는 <a titleclass="수식new" classtitle="new수식" href="http://ko.wikipedia.org/w/index.php?title=%EC%88%98%EC%8B%9D&amp;action=edit">수식</a>이나 <a class="new" title="논리 언어" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EB%85%BC%EB%A6%AC_%EC%96%B8%EC%96%B4&amp;action=edit">논리적 언어</a>로 표현된 계산을 수행하거나 작업을 통제하는 기계이다.</p>
<p>사전에서 찾을 수 있는 위와 같은 정의는 정확하지만 가리키는 범위가 너무 넓어 이전의 컴퓨터와 현재의 컴퓨터 그리고 미래의 컴퓨터를 정확하게 설명하기는 어렵다. 더 의미있는 질문은 컴퓨터의 종류에는 어떤 것들이 있는가? 아니면 현재의 컴퓨터의 능력과 기능의 특별한 점은 무엇인가? 일 것이다.</p>
<p>라이프니츠는 계산하면서 보낸 시간에 대해 불평하여 기계식 계산기를 고안했다. 1950년대 초에 '컴퓨팅 머신'(Computing Machine)이라는 말이 전산기를 지시하기 위해서 쓰였다. 마침내, 더 짧은 컴퓨터(computer)라는 말이 컴퓨팅 머신을 대체했다. 본래, 산술은 수학적인 문제와 밀접하게 연관되어있지만, 현대 컴퓨터들은 값이 싸지고 용도가 다양해짐에 따라, 수학과는 관계없는 많은 작업들에 쓰인다.</p>
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<h2><span class="editsection">[<a title="부분 편집: 어원" href="http://ko.wikipedia.org/w/index.php?title=%EC%BB%B4%ED%93%A8%ED%84%B0&amp;action=edit&amp;section=1">편집</a>]</span> <span class="mw-headline">어원</span></h2>
<p>컴퓨터라는 말의 의미는 많이 변화해 왔지만 항상 그 때에 사용되고 컴퓨터의 능력을 표현하는데 어려움을 겪어왔다. 이 말은 본래 컴퓨터는 원래 기계적인 도움의 유무에 관계없이 수학적인 계산을 수행하는 사람을 가리키는 말로 사용되었고 현재에도 그렇게 사용되기도 한다. ODE2 목록에 의하면 1897년에 처음으로 기계적 계산을 수행하는 기계를 일컫는 말로 사용되었다. 1946년까지 여러가지 수식어가 소개되었는데, 이것들은 여러 종류의 컴퓨터를 구별하기 위한 것들이었다. 이 수식어들은 <a title="아날로그" href="http://ko.wikipedia.org/wiki/%EC%95%84%EB%82%A0%EB%A1%9C%EA%B7%B8">아날로그</a>, <a title="디지털" href="http://ko.wikipedia.org/wiki/%EB%94%94%EC%A7%80%ED%84%B8">디지털</a>, <a title="전자" href="http://ko.wikipedia.org/wiki/%EC%A0%84%EC%9E%90">전자</a>를 포함하고 있다.</p>
<p><a name=".EC.97.AD.EC.82.AC"></a></p>
<h2><span class="editsection">[<a title="부분 편집: 역사" href="http://ko.wikipedia.org/w/index.php?title=%EC%BB%B4%ED%93%A8%ED%84%B0&amp;action=edit&amp;section=2">편집</a>]</span> <span class="mw-headline">역사</span></h2>
<p>컴퓨터의 역사, 적어도 그 일부는 <a title="계산기" href="http://ko.wikipedia.org/wiki/%EA%B3%84%EC%82%B0%EA%B8%B0">계산기</a>와 역사를 같이 한다. 수를 세기 위해 고안된 <a titleclass="공깃돌new" classtitle="new공깃돌" href="http://ko.wikipedia.org/w/index.php?title=%EA%B3%B5%EA%B9%83%EB%8F%8C&amp;action=edit">공깃돌</a>도 넓은 의미의 계산기라 할 수 있으나 가장 오래된 체계적인 계산기는 <a titleclass="주판new" classtitle="new주판" href="http://ko.wikipedia.org/w/index.php?title=%EC%A3%BC%ED%8C%90&amp;action=edit">주판</a>(abacus)이라고 할 수 있다.</p>
<p><a title="블레즈 파스칼" href="http://ko.wikipedia.org/wiki/%EB%B8%94%EB%A0%88%EC%A6%88_%ED%8C%8C%EC%8A%A4%EC%B9%BC">블레즈 파스칼</a>은 톱니바퀴를 이용하여 계산기를 만들었다.</p>
<p>최초의 <a class="new" title="전자 컴퓨터" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EC%A0%84%EC%9E%90_%EC%BB%B4%ED%93%A8%ED%84%B0&amp;action=edit">전자 컴퓨터</a>는 1946년에 개발된 <a title="에니악" href="http://ko.wikipedia.org/wiki/%EC%97%90%EB%8B%88%EC%95%85">에니악(ENIAC)</a>이다. 에니악은 무게가 톤단위 이며, 방하나를 가득 채웠고, 작동을 위해서 많은 관리자를 필요로 하였다. 매우 고가였기 때문에 정부와 큰 연구기관만이 보유할 수 있었고 생상량이 많지 않아서 세계적 필요를 만족 시킬 수 없었다.</p>
<p><a title="앨런 튜링" href="http://ko.wikipedia.org/wiki/%EC%95%A8%EB%9F%B0_%ED%8A%9C%EB%A7%81">앨런 튜링</a>이 컴퓨터의 가장 단순화된 기본 모델을 제시하였다.</p>
<p><a title="존 폰 노이만" href="http://ko.wikipedia.org/wiki/%EC%A1%B4_%ED%8F%B0_%EB%85%B8%EC%9D%B4%EB%A7%8C">존 폰 노이만</a>은 프로그램 내장 방식을 처음 채택했다. 이전에는 프로그램 입력과 결과 출력을 분리하지 않았다.</p>
<p><a title="1970년대" href="http://ko.wikipedia.org/wiki/1970%EB%85%84%EB%8C%80">1970년대</a> 말부터 <a title="개인용 컴퓨터" href="http://ko.wikipedia.org/wiki/%EA%B0%9C%EC%9D%B8%EC%9A%A9_%EC%BB%B4%ED%93%A8%ED%84%B0">개인용 컴퓨터</a>(PC; Personal Computer)가 보편화되기 시작했다. 사실, 최초의 개인용 컴퓨터는 <a title="1950년" href="http://ko.wikipedia.org/wiki/1950%EB%85%84">1950년</a> <a class="new" title="에드문드 버클리" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EC%97%90%EB%93%9C%EB%AC%B8%EB%93%9C_%EB%B2%84%ED%81%B4%EB%A6%AC&amp;action=edit">에드문드 버클리</a>가 만든 시몬(Simon)이라고 본다.<a relclass="nofollowexternal autonumber" title="http://www.blinkenlights.com/pc.shtml" classrel="external autonumbernofollow" href="http://www.blinkenlights.com/pc.shtml">[1]</a> 이후로 대중적으로 성공한 컴퓨터로는 <a title="1975년" href="http://ko.wikipedia.org/wiki/1975%EB%85%84">1975년</a> MITS사의 알테어(Altair)나 <a title="1975년" href="http://ko.wikipedia.org/wiki/1975%EB%85%84">1975년</a>의 <a title="애플 컴퓨터" href="http://ko.wikipedia.org/wiki/%EC%95%A0%ED%94%8C_%EC%BB%B4%ED%93%A8%ED%84%B0">애플 컴퓨터</a>를 들 수 있다.</p>
<p>현재 개인용 컴퓨터는 <a title="1981년" href="http://ko.wikipedia.org/wiki/1981%EB%85%84">1981년</a>에 탄생한 <a title="아이비엠" href="http://ko.wikipedia.org/wiki/%EC%95%84%EC%9D%B4%EB%B9%84%EC%97%A0">아이비엠</a> PC(IBM PC)의 후손들이 주를 이루고 있다. 이들은 <a title="인텔" href="http://ko.wikipedia.org/wiki/%EC%9D%B8%ED%85%94">인텔</a>사의 <a title="80계열" href="http://ko.wikipedia.org/wiki/80%EA%B3%84%EC%97%B4">80계열</a>이나 이에 호환되는 <a title="중앙처리장치" href="http://ko.wikipedia.org/wiki/%EC%A4%91%EC%95%99%EC%B2%98%EB%A6%AC%EC%9E%A5%EC%B9%98">중앙처리장치</a>(CPU)를 사용하며, <a title="마이크로소프트" href="http://ko.wikipedia.org/wiki/%EB%A7%88%EC%9D%B4%ED%81%AC%EB%A1%9C%EC%86%8C%ED%94%84%ED%8A%B8">마이크로소프트</a>(MS)사의 <a title="윈도우즈" href="http://ko.wikipedia.org/wiki/%EC%9C%88%EB%8F%84%EC%9A%B0%EC%A6%88">윈도우즈</a>(Windows)나 <a title="리눅스" href="http://ko.wikipedia.org/wiki/%EB%A6%AC%EB%88%85%EC%8A%A4">리눅스</a>(Linux)등을 운영체제로 하고 있다.</p>
<p><a title="1900년" href="http://ko.wikipedia.org/wiki/1900%EB%85%84">1900년</a> 이후로 18개월에서 24개월을 주기로 성능이 2배가 향상되는 폭발적인 발전이 있었다. <a title="인텔" href="http://ko.wikipedia.org/wiki/%EC%9D%B8%ED%85%94">인텔</a>(Intel)사의 공동창업자인 <a class="new" title="고든 무어" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EA%B3%A0%EB%93%A0_%EB%AC%B4%EC%96%B4&amp;action=edit">고든 무어</a>(Gordon E. Moore)가 1965년에 컴퓨터의 발전에 대한 이러한 속성을 처음 소개했다. (<a title="무어의 법칙" href="http://ko.wikipedia.org/wiki/%EB%AC%B4%EC%96%B4%EC%9D%98_%EB%B2%95%EC%B9%99">무어의 법칙</a> 참조)</p><p>그 결과 <a title="1996년" href="http://ko.wikipedia.org/wiki/1996%EB%85%84">1996년</a> IBM의 <a title="딥 블루" href="http://ko.wikipedia.org/wiki/%EB%94%A5_%EB%B8%94%EB%A3%A8">딥 블루</a>(Deep Blue)라는 <a title="수퍼컴퓨터" href="http://ko.wikipedia.org/wiki/%EC%88%98%ED%8D%BC%EC%BB%B4%ED%93%A8%ED%84%B0">수퍼컴퓨터</a>는 사람과의 <a title="체스" href="http://ko.wikipedia.org/wiki/%EC%B2%B4%EC%8A%A4">체스</a> 경기에서 세계 챔피언 <a class="new" title="게리 카스파로프" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EA%B2%8C%EB%A6%AC_%EC%B9%B4%EC%8A%A4%ED%8C%8C%EB%A1%9C%ED%94%84&amp;action=edit">게리 카스파로프</a>(Garry Kasparov)를 이겼다. 그러나 카스파로프는 3승과 2무를 더 올려 전체에서는 승리를 거두었다.</p>
<p><a name=".EB.B6.84.EB.A5.98"></a></p>
<h2><span class="editsection">[<a title="부분 편집: 분류" href="http://ko.wikipedia.org/w/index.php?title=%EC%BB%B4%ED%93%A8%ED%84%B0&amp;action=edit&amp;section=3">편집</a>]</span> <span class="mw-headline">분류</span></h2>
<li><a title="미니컴퓨터" href="http://ko.wikipedia.org/wiki/%EB%AF%B8%EB%8B%88%EC%BB%B4%ED%93%A8%ED%84%B0">미니컴퓨터</a></li>
<li><a title="워크스테이션" href="http://ko.wikipedia.org/wiki/%EC%9B%8C%ED%81%AC%EC%8A%A4%ED%85%8C%EC%9D%B4%EC%85%98">워크스테이션</a></li>
<li><a class="new" title="대형 컴퓨터(기업용)" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EB%8C%80%ED%98%95_%EC%BB%B4%ED%93%A8%ED%84%B0%28%EA%B8%B0%EC%97%85%EC%9A%A9%29&amp;action=edit">대형 컴퓨터(기업용)</a></li>
<li><a title="개인용 컴퓨터" href="http://ko.wikipedia.org/wiki/%EA%B0%9C%EC%9D%B8%EC%9A%A9_%EC%BB%B4%ED%93%A8%ED%84%B0">개인용 컴퓨터(PC)</a></li>
<li><a class="new" title="랩탑(노트북)" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EB%9E%A9%ED%83%91%28%EB%85%B8%ED%8A%B8%EB%B6%81%29&amp;action=edit">랩탑(노트북)</a></li>
<li><a title="피디에이" href="http://ko.wikipedia.org/wiki/%ED%94%BC%EB%94%94%EC%97%90%EC%9D%B4">피디에이(PDA)</a></li>
<li><a class="new" title="착용형 컴퓨터" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EC%B0%A9%EC%9A%A9%ED%98%95_%EC%BB%B4%ED%93%A8%ED%84%B0&amp;action=edit">착용형 컴퓨터</a></li>
</ul>
<p><a name=".EC.A0.9C.EC.A1.B0_.EA.B8.B0.EC.88.A0.EC.97.90_.EB.94.B0.EB.A5.B8_.EB.B6.84.EB.A5.98"></a></p>
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<h2><span class="editsection">[<a title="부분 편집: 구성" href="http://ko.wikipedia.org/w/index.php?title=%EC%BB%B4%ED%93%A8%ED%84%B0&amp;action=edit&amp;section=11">편집</a>]</span> <span class="mw-headline">구성</span></h2>
<p>크게 논리적 지시 사항인 <a title="소프트웨어" href="http://ko.wikipedia.org/wiki/%EC%86%8C%ED%94%84%ED%8A%B8%EC%9B%A8%EC%96%B4">소프트웨어</a>(S/W; Software)와 물리적 장치인 <a title="하드웨어" href="http://ko.wikipedia.org/wiki/%ED%95%98%EB%93%9C%EC%9B%A8%EC%96%B4">하드웨어</a>(H/W; Hardware)로 구분할 수 있으며, <strong class="selflink">컴퓨터</strong>의 <a title="하드웨어" href="http://ko.wikipedia.org/wiki/%ED%95%98%EB%93%9C%EC%9B%A8%EC%96%B4">하드웨어</a>는 <a title="중앙 처리 장치" href="http://ko.wikipedia.org/wiki/%EC%A4%91%EC%95%99_%EC%B2%98%EB%A6%AC_%EC%9E%A5%EC%B9%98">중앙 처리 장치</a>(CPU)와 <a title="주기억 장치" href="http://ko.wikipedia.org/wiki/%EC%A3%BC%EA%B8%B0%EC%96%B5_%EC%9E%A5%EC%B9%98">주기억 장치</a>(RAM) 및 <a title="컴퓨터 입력 장치" href="http://ko.wikipedia.org/wiki/%EC%BB%B4%ED%93%A8%ED%84%B0_%EC%9E%85%EB%A0%A5_%EC%9E%A5%EC%B9%98">입력 장치</a>(<a title="컴퓨터 자판" href="http://ko.wikipedia.org/wiki/%EC%BB%B4%ED%93%A8%ED%84%B0_%EC%9E%90%ED%8C%90">키보드</a>, <a title="마우스" href="http://ko.wikipedia.org/wiki/%EB%A7%88%EC%9A%B0%EC%8A%A4">마우스</a> 등), <a title="컴퓨터 출력 장치" href="http://ko.wikipedia.org/wiki/%EC%BB%B4%ED%93%A8%ED%84%B0_%EC%B6%9C%EB%A0%A5_%EC%9E%A5%EC%B9%98">출력 장치</a>(<a titleclass="모니터new" classtitle="new모니터" href="http://ko.wikipedia.org/w/index.php?title=%EB%AA%A8%EB%8B%88%ED%84%B0&amp;action=edit">모니터</a>, <a title="프린터" href="http://ko.wikipedia.org/wiki/%ED%94%84%EB%A6%B0%ED%84%B0">프린터</a> 등), 그리고 <a class="new" title="주변 기기" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EC%A3%BC%EB%B3%80_%EA%B8%B0%EA%B8%B0&amp;action=edit">주변 기기</a> 들로 구성된다.</p>
<p><a name=".EC.9E.91.EB.8F.99.EC.9B.90.EB.A6.AC"></a></p>
<h2><span class="editsection">[<a title="부분 편집: 작동원리" href="http://ko.wikipedia.org/w/index.php?title=%EC%BB%B4%ED%93%A8%ED%84%B0&amp;action=edit&amp;section=12">편집</a>]</span> <span class="mw-headline">작동원리</span></h2>
<p><a name=".EB.84.A4.ED.8A.B8.EC.9B.8C.ED.81.AC.EC.99.80_.EC.9D.B8.ED.84.B0.EB.84.B7"></a></p>
<h3><span class="editsection">[<a title="부분 편집: 네트워크와 인터넷" href="http://ko.wikipedia.org/w/index.php?title=%EC%BB%B4%ED%93%A8%ED%84%B0&amp;action=edit&amp;section=21">편집</a>]</span> <span class="mw-headline">네트워크와 인터넷</span></h3>
<p><a title="1970년대" href="http://ko.wikipedia.org/wiki/1970%EB%85%84%EB%8C%80">1970년대</a>에 미국 전역의 연구소들에 있는 컴퓨터들이 통신 기술을 통해 연결되기 시작했다. 이 작업은 <a titleclass="ARPAnew" classtitle="newARPA" href="http://ko.wikipedia.org/w/index.php?title=ARPA&amp;action=edit">ARPA</a>의 후원을 받아 이루어졌으며 이 네트워크의 이름을 <a title="아파넷" href="http://ko.wikipedia.org/wiki/%EC%95%84%ED%8C%8C%EB%84%B7">아파넷</a>(ARPANET)이라 명명하였다. 아파넷의 토대가 된 기술은 계속 발전하고, 학술기관 바깥으로 확산되어서 <a title="인터넷" href="http://ko.wikipedia.org/wiki/%EC%9D%B8%ED%84%B0%EB%84%B7">인터넷</a>이라 알려지게 되었다. <a class="new" title="존 게이지" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EC%A1%B4_%EA%B2%8C%EC%9D%B4%EC%A7%80&amp;action=edit">존 게이지</a>(John Gage)와 <a title="선 마이크로시스템즈" href="http://ko.wikipedia.org/wiki/%EC%84%A0_%EB%A7%88%EC%9D%B4%ED%81%AC%EB%A1%9C%EC%8B%9C%EC%8A%A4%ED%85%9C%EC%A6%88">선 마이크로시스템즈</a>의 <a class="new" title="빌 조이" class="new" href="http://ko.wikipedia.org/w/index.php?title=%EB%B9%8C_%EC%A1%B0%EC%9D%B4&amp;action=edit">빌 조이</a>(Bill Joy)는 이를 &ldquo;네트워크가 곧 컴퓨터가 되었다&rdquo;고 표현하였다. 인터넷을 비롯한 네트워크의 발달로 <a title="운영 체제" href="http://ko.wikipedia.org/wiki/%EC%9A%B4%EC%98%81_%EC%B2%B4%EC%A0%9C">운영 체제</a>와 응용 프로그램들이 개인용 컴퓨터 바깥의 주변기기와 같은 다른 자원에도 접근할 수 있도록 변화되었다. 초기에 이런 설비에 접근할 수 있는 사람들은 한정되어 있었으나, 1990년대에 <a title="이메일" href="http://ko.wikipedia.org/wiki/%EC%9D%B4%EB%A9%94%EC%9D%BC">이메일</a>과 <a title="월드 와이드 웹" href="http://ko.wikipedia.org/wiki/%EC%9B%94%EB%93%9C_%EC%99%80%EC%9D%B4%EB%93%9C_%EC%9B%B9">월드 와이드 웹</a> 등의 확산과 더불어 <a title="이더넷" href="http://ko.wikipedia.org/wiki/%EC%9D%B4%EB%8D%94%EB%84%B7">이더넷</a>(Ethernet)과 <a titleclass="ADSLnew" classtitle="newADSL" href="http://ko.wikipedia.org/w/index.php?title=ADSL&amp;action=edit">ADSL</a> 같은 값싸고 빠른 네트워킹 기술의 개발로 컴퓨터 네트워킹은 여러 나라에서 일상화되었으며, 휴대통신 기술과 결합하여 <a title="유비쿼터스" href="http://ko.wikipedia.org/wiki/%EC%9C%A0%EB%B9%84%EC%BF%BC%ED%84%B0%EC%8A%A4">유비쿼터스</a>(Ubiquitous)라는 신조어를 만들기도 했다.</p>
<p><a name=".EC.BB.B4.ED.93.A8.ED.84.B0_.EA.B7.B8.EB.9E.98.ED.94.BD.EC.8A.A4"></a></p>
<h3><span class="editsection">[<a title="부분 편집: 컴퓨터 그래픽스" href="http://ko.wikipedia.org/w/index.php?title=%EC%BB%B4%ED%93%A8%ED%84%B0&amp;action=edit&amp;section=22">편집</a>]</span> <span class="mw-headline">컴퓨터 그래픽스</span></h3>
<li><a title="전산학" href="http://ko.wikipedia.org/wiki/%EC%A0%84%EC%82%B0%ED%95%99">전산학</a>(Computer science)은 효율적인 <a title="알고리즘" href="http://ko.wikipedia.org/wiki/%EC%95%8C%EA%B3%A0%EB%A6%AC%EC%A6%98">연산방식</a> (algorithm) 을 개발하는 등의 전산과 관련된 과정을 연구하는 학문이다. 이 학문이 추구하는 것은 컴퓨터를 사용함으로써 문제들을 해결 할수있는가, 어떻게 효과적으로 문제를 풀수 있는가, 그리고 그런 해결책을 푸는 효율적인 프로그램을 어떻게 만들것인가 하는 것들이다.</li>
<li>소프트웨어 엔지니어링 (Software engineering) 은 신뢰할만한 소프트웨어 시스템 개발하는 동시에 시간과 비용을 계산하고 최소화 시키는 방법론과 실행에 촛점을 맞춘다.</li>
<li><a titleclass="정보시스템new" classtitle="new정보시스템" href="http://ko.wikipedia.org/w/index.php?title=%EC%A0%95%EB%B3%B4%EC%8B%9C%EC%8A%A4%ED%85%9C&amp;action=edit">정보시스템</a> (Information systems)은 사업체등 폭 넓은 조직환경에서의 컴퓨터시스템 활용에 촛점을 맞춘다.</li> <li>다른 직종과 컴퓨터를 연결시킨 학문분야가 많이 생겨나고있다. 한가지 예가 컴퓨터 기술을 응용해 지리정보에 관한 문제를 처리하는 <a titleclass="지리정보학new" classtitle="new지리정보학" href="http://ko.wikipedia.org/w/index.php?title=%EC%A7%80%EB%A6%AC%EC%A0%95%EB%B3%B4%ED%95%99&amp;action=edit">지리정보학</a> (GIS|geographical information systems) 전문가이다.</li>
</ul>
<p><a name=".EC.B0.B8.EA.B3.A0.EC.82.AC.ED.95.AD"></a></p>
<p><a name=".EB.B0.94.EA.B9.A5_.EA.B3.A0.EB.A6.AC"></a></p>
<h2><span class="editsection">[<a title="부분 편집: 바깥 고리" href="http://ko.wikipedia.org/w/index.php?title=%EC%BB%B4%ED%93%A8%ED%84%B0&amp;action=edit&amp;section=26">편집</a>]</span> <span class="mw-headline">바깥 고리</span></h2>
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