{"id":8719,"date":"2009-09-29T14:31:00","date_gmt":"2009-09-29T14:31:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=8719"},"modified":"2009-09-29T14:31:00","modified_gmt":"2009-09-29T14:31:00","slug":"%ec%a0%95%ea%b7%9c%eb%b6%84%ed%8f%ac%ec%9d%98-%ec%a0%81%eb%b6%84","status":"publish","type":"post","link":"http:\/\/melotopia.net\/b\/?p=8719","title":{"rendered":"\uc815\uaddc\ubd84\ud3ec\uc758 \uc801\ubd84"},"content":{"rendered":"<div class=\"desc\">\n        \uc815\uaddc\ubd84\ud3ec(Normal distribution)\ub294 \ud1b5\uacc4\ub294 \ubb3c\ub860\uc774\uace0 \uc774 \uc138\uc0c1\uc744 \uc124\uba85\ud558\ub294 \uc774\ub860 \uc911\uc5d0\uc11c \ub300\ubd80\ubd84\uc758 \uacbd\uc6b0\uc5d0 \uc790\uc8fc \ub4f1\uc7a5\ud55c\ub2e4. \uc774\uac74 \uc218\ud559\uc744 \ubb38\uc5b4\ubc1c\uc2dd\uc73c\ub85c \uc190\ub314\ub358 \uac00\uc6b0\uc2a4\uac00 \uc5f0\uad6c\ub97c \uc880 \ud588\uc5c8\uae30 \ub54c\ubb38\uc5d0 \uac00\uc6b0\uc2a4 \ubd84\ud3ec(Gaussian Distribution)\uc774\ub77c\uace0\ub3c4 \ud55c\ub2e4. \uadf8 \uc0dd\uae34 \ubaa8\uc591\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n<p>        $f(x)=Aexp(-a(x-m)^2\/s)$<\/p>\n<p>        \uc5ec\uae30\uc11c A, a, m, s\ub294 \ub2e4 \uc801\ub2f9\ud788 \uc8fc\uc5b4\uc9c4 \uc0c1\uc218\ub2e4. \uc624\ub298\uc740 \uc774 \ud568\uc218\ub97c \uc801\ubd84\ud574 \ubcf4\ub3c4\ub85d \ud558\uc790. \uc774\uac78 \ucc98\uc74c\ubd80\ud130 \uc801\ubd84\ud558\ub824\uba74 \uadc0\ucc2e\uc73c\ubbc0\ub85c, x\ub97c x-m\uc73c\ub85c \ud3c9\ud589\uc774\ub3d9\ud558\uace0, \uadf8\ub807\uac8c \ud3c9\ud589\uc774\ub3d9\ud55c x\ub97c $\\sqrt{s\/a}x$\ub85c \ubcc0\uc218\ubcc0\ud658\ud558\uace0, \ub2e4\uc2dc \uc804\uccb4 \ud568\uc218\ub97c A\ub85c \ub098\ub220\uc900 \ub2e4\uc74c\uc758 \ud568\uc218\ub97c \uc801\ubd84\ud574 \ubcf8\ub2e4.<\/p>\n<p>        $g(x)=exp(-x^2)$<\/p>\n<p>        \uc774\uac8c \ub108\ubb34 \uac04\ub2e8\ud574 \ubcf4\uc778\ub2e4\uba74, \ub2e4\uc74c\uc758 \ub0b4\uc6a9\uc744 \uc77d\uc9c0 \ub9d0\uace0 \uc6d0\ub798\uc758 $f(x)$\uc758 \uc801\ubd84\uc5d0 \ub3c4\uc804\ud574 \ubcf4\uace0\ub098\uc11c \ub2e4\uc2dc \ub418\ub3cc\uc544\uc624\uae30 \ubc14\ub780\ub2e4.<\/p>\n<p>        \ubb3c\ub860, \uc5ec\uae30\uc11c \uc801\ubd84\uc774\ub77c \ud568\uc740 x\uc758 \uad6c\uac04\uc744 0\ubd80\ud130 \ubb34\ud55c\ub300\uae4c\uc9c0\ub85c \uc7a1\ub294 \uacbd\uc6b0\uc5d0 \ub300\ud55c \uc801\ubd84\uc774\ub2e4. \uc218\ud559\uacfc\uc5d0\uc11c \uc774\uac78 \ubc30\uc6b8 \ub54c\ub294 \uc6d0\ub798 \uc774 \uc801\ubd84\uc774 \uc218\ub834\ud558\ub294\uc9c0 \uc548\ud558\ub294\uc9c0\ubd80\ud130 \ub530\uc838\uc57c \ud558\uc9c0\ub9cc \uc774 \uc801\ubd84\uc758 \uc218\ub834\uc131\uc740 \ub610\ud55c \uc27d\uac8c \uc99d\uba85\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \uac74\ub108 \ub6f4\ub2e4.<\/p>\n<p>        \ubbf8\uc801\ubd84 \uad50\uc7ac\uc5d0 \ub4f1\uc7a5\ud558\ub294 \uac00\uc7a5 \uac04\ub2e8\ud55c \uacc4\uc0b0\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<br \/>\n        <br \/>\n        (\ucc38\uace0 : \uace0\ud615\uc8fc, \uc2e0\ud574\uc6a9. \ubbf8\ubd84\uc801\ubd84\ud559. \uacbd\ubb38\uc0ac)<br \/>\n        <br \/>\n        \uc77c\ub2e8, \uc800\uac78 \uc801\ubd84\ud560 \uc218 \uc788\ub2e4 \uce58\uace0 \ubb34\ud131\ub300\uace0<br \/>\n        <br \/>\n        $I=\\int _0 ^\\infty g(x)=exp(-x^2)dx$<br \/>\n        <br \/>\n        \ub77c\uace0 \ud55c\ub2e4.<br \/>\n        <br \/>\n        \uadfc\ub370 \uc801\ubd84 \uc548\uc5d0 \ub4e4\uc5b4\uac00 \uc788\ub294 \ubcc0\uc218\ub294 \uc0ac\uc2e4 \uadf8\ub188\uc774 \uadf8\ub188\uc774\ubbc0\ub85c $I=\\int _0 ^\\infty h(y)=exp(-y^2)dy$ \ub77c\uace0 \uc368\ub3c4 \ub41c\ub2e4. \uadf8\ub7fc<br \/>\n        <br \/>\n        $I^2 = \\int_0^\\infty \\int_0^\\infty g(x)h(y)dxdy= \\int_0^\\infty\\int_0^\\infty exp(-x^2)exp(-y^2) dxdy$<br \/>\n        <br \/>\n        \uac00 \ub41c\ub2e4.<\/p>\n<p>        \uadfc\ub370 \uc9c0\uc218\ud568\uc218\ub294 \uacf1\uc148\uc744 \ub367\uc148\uc73c\ub85c \ubc14\uafb8\ub294 \uc2e0\ubb18\ud55c \uc131\uc9c8\uc774 \uc788\ub2e4. \ub530\ub77c\uc11c \uc704\uc758 \uc2dd\uc740<br \/>\n        <br \/>\n        $I^2 = \\int _0 ^\\infty \\int _0^\\infty g(x)h(y)dxdy= \\int_0^\\infty \\int_0^\\infty exp(-(x^2+y^2)) dxdy$<br \/>\n        <br \/>\n        \ub77c\uace0 \uc368\ub3c4 \ub41c\ub2e4. \uc774\uc81c \ubcc0\uc218\ubcc0\ud658\uc744 \ud558\uc790. (x, y) \ud3c9\uba74\uc5d0\uc11c 2\uc911\uc801\ubd84\uc774\ubbc0\ub85c $(r, \\theta)$ \ud3c9\uba74\uc5d0\uc11c\uc758 2\uc911\uc801\ubd84\uc73c\ub85c \uac04\ub2e8\ud788 \ubc14\uafc0 \uc218 \uc788\ub294\ub370, \ubcc0\uc218\ubcc0\ud658\uc5d0\uc11c \uac00\uc7a5 \uc911\uc694\ud55c\uac8c \uad6c\uac04\uc744 \ubc14\uafb8\ub294 \uac83\uc774\uc9c0\ub9cc \uc5b4\ucc28\ud53c $\\theta$\uc5d0 \ub300\ud574\uc11c\ub294 \ud55c\ubc14\ud034 \ub2e4 \ub3cc\ub824\uc57c \ud558\ubbc0\ub85c $d\\theta$ \uc801\ubd84\uc740 \uadf8\ub0e5 $2\\pi$\uac00 \ub418\uc5b4 \ubc84\ub9b0\ub2e4. \uadf8\ub7fc<br \/>\n        <br \/>\n        $I^2 = 2\\pi \\int_0^\\infty exp(-r^2)r dr$<br \/>\n        <br \/>\n        \uc774\ub807\uac8c \ub41c\ub2e4. \uc774\uac74 \uac04\ub2e8\ud558\uac8c \uc554\uc0b0\uc73c\ub85c\ub3c4 \uacc4\uc0b0\ud560 \uc218 \uc788\ub294\ub370, \ub4a4\uc5d0 \uc801\ubd84 \ubd80\ubd84\uc774 1\uc774 \ub418\uc5b4 \ubc84\ub9b0\ub2e4. \ub530\ub77c\uc11c<br \/>\n        <br \/>\n        $I^2 =2\\pi$<br \/>\n        <br \/>\n        \uc774\uc81c \uc6b0\ub9ac\ub294<br \/>\n        <br \/>\n        $I=\\sqrt{2\\pi}$<br \/>\n        <br \/>\n        \ub77c\ub294 \uc0ac\uc2e4\uc744 \uc54c\uac8c \ub418\uc5c8\ub2e4.<\/p>\n<p>        \uc774\uc81c \ub098\uba38\uc9c0\ub294 A, a, m, s\ub97c \uc6d0\ub798\ub300\ub85c \ub418\ub3cc\ub824 \uc8fc\ub294 \uac83\uc774\ub2e4. \uc774\uac74 \uc801\ubd84\uc758 \ubcc0\uc218\ubcc0\ud658\uc744 \uc798 \ud574\uc8fc\uba74 \ub418\ub2c8\uae4c \uc5f0\uc2b5\uc0bc\uc544\uc11c \uc9c1\uc811 \ud574\ubcf4\uae30 \ubc14\ub780\ub2e4.<\/p>\n<p>        \uc544, \ubcf8\ub860\uc73c\ub85c \ub3cc\uc544\uc640\uc11c. \ud45c\uc900\uc815\uaddc\ubd84\ud3ec\ub97c \uc801\ubd84\ud558\uba74 1\uc774 \ub418\ub294 \uc774\uc720\ub294, \ud45c\uc900\uc815\uaddc\ubd84\ud3ec\ub97c \uc801\ubd84\ud574\uc11c 1\uc774 \ub418\ub3c4\ub85d \uc704\uc758 A\ub97c &#8220;\uc801\ub2f9\ud788&#8221; \ub9de\ucdb0\uc8fc\uc5c8\uae30 \ub54c\ubb38\uc774\ub2e4. \uadf8\ub807\uac8c \uc801\ub2f9\ud788 \ub9de\ucdb0\uc8fc\uc5b4\uc57c\ub9cc \ud558\ub294 \uc774\uc720\ub294, \ud45c\uc900\uc815\uaddc\ubd84\ud3ec\ub97c \ud655\ub960\ubc00\ub3c4\ud568\uc218\ub85c \uc4f0\uae30 \uc704\ud574\uc11c\ub294 \ud655\ub960\uc758 \uac00\uc7a5 \uc911\uc694\ud55c \uc131\uc9c8\uc778 &#8220;\ud655\ub960\uc758 \ubaa8\ub4e0 \ud569\uc740 1\uc774\ub2e4&#8221;\ub97c \ub9cc\uc871\ud574\uc57c\ub9cc \ud558\uae30 \ub54c\ubb38\uc774\ub2e4. \uc989, \uc704\uc5d0\uc11c \uc815\uaddc\ubd84\ud3ec\ub97c \uc801\ubd84\ud558\ub294 \uac83\uacfc\ub294 \uad00\ub828\uc774 \uc5c6\ub2e4\uace0 \ubd10\ub3c4 \uc88b\ub2e4.<br \/>\n        <\/p>\n<div style=\"width:100%;margin-top:30px;clear:both;height:30px\">\n<div style=\"width:31px;float:left;\">\n<a href=\"\/toolbar\/popup\/abuseReport\/?entryId=1536\" onclick=\"window.open(this.href, 'tistoryThisBlogPopup', 'width=550, height=510, toolbar=no, menubar=no, status=no, scrollbars=no'); return false;\"><br \/>\n<img data-recalc-dims=\"1\" decoding=\"async\" alt=\"\uc2e0\uace0\" src=\"https:\/\/i0.wp.com\/t1.daumcdn.net\/tistory_admin\/static\/ico\/ico_spam_report.png\" style=\"border:0\"\/><br \/>\n<\/a>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\uc815\uaddc\ubd84\ud3ec(Normal distribution)\ub294 \ud1b5\uacc4\ub294 \ubb3c\ub860\uc774\uace0 \uc774 \uc138\uc0c1\uc744 \uc124\uba85\ud558\ub294 \uc774\ub860 \uc911\uc5d0\uc11c \ub300\ubd80\ubd84\uc758 \uacbd\uc6b0\uc5d0 \uc790\uc8fc \ub4f1\uc7a5\ud55c\ub2e4. \uc774\uac74 \uc218\ud559\uc744 \ubb38\uc5b4\ubc1c\uc2dd\uc73c\ub85c \uc190\ub314\ub358 \uac00\uc6b0\uc2a4\uac00 \uc5f0\uad6c\ub97c \uc880 \ud588\uc5c8\uae30 \ub54c\ubb38\uc5d0 \uac00\uc6b0\uc2a4 \ubd84\ud3ec(Gaussian Distribution)\uc774\ub77c\uace0\ub3c4 \ud55c\ub2e4. \uadf8 \uc0dd\uae34 \ubaa8\uc591\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4. $f(x)=Aexp(-a(x-m)^2\/s)$ \uc5ec\uae30\uc11c A, a, m, s\ub294 \ub2e4 \uc801\ub2f9\ud788 \uc8fc\uc5b4\uc9c4 \uc0c1\uc218\ub2e4. \uc624\ub298\uc740 \uc774 \ud568\uc218\ub97c \uc801\ubd84\ud574 \ubcf4\ub3c4\ub85d \ud558\uc790. \uc774\uac78 \ucc98\uc74c\ubd80\ud130 \uc801\ubd84\ud558\ub824\uba74 \uadc0\ucc2e\uc73c\ubbc0\ub85c, x\ub97c x-m\uc73c\ub85c \ud3c9\ud589\uc774\ub3d9\ud558\uace0, \uadf8\ub807\uac8c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-8719","post","type-post","status-publish","format-standard","hentry","category-academic"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8o6gA-2gD","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8719","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8719"}],"version-history":[{"count":0,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8719\/revisions"}],"wp:attachment":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8719"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8719"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8719"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}