{"id":8370,"date":"2009-01-31T07:39:00","date_gmt":"2009-01-31T07:39:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=8370"},"modified":"2009-01-31T07:39:00","modified_gmt":"2009-01-31T07:39:00","slug":"%ec%a7%81%ec%82%ac%ea%b0%81%ed%98%95-%ed%95%a8%ec%88%98%ec%9d%98-%ed%91%b8%eb%a6%ac%ec%97%90-%eb%b3%80%ed%99%98","status":"publish","type":"post","link":"http:\/\/melotopia.net\/b\/?p=8370","title":{"rendered":"\uc9c1\uc0ac\uac01\ud615 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658"},"content":{"rendered":"<div class=\"desc\">\n        **\uc218\uc2dd\uc740 \uc778\ud130\ub137 \uc775\uc2a4\ud50c\ub85c\ub7ec\uc5d0\uc11c\ub294 \uc81c\ub300\ub85c \ud45c\ud604\ub418\uc9c0 \uc54a\uc74c. \ud30c\uc774\uc5b4\ud3ed\uc2a4 \uc6f9 \ube0c\ub77c\uc6b0\uc800\ub97c \uad8c\uc7a5\ud568.<\/p>\n<p>        \uc9c1\uc0ac\uac01\ud615 \ud568\uc218\ub97c \ud478\ub9ac\uc5d0 \ubcc0\ud658 \ud574\ubcf4\uc790. \uac04\ub2e8\ud558\ub2e4.<br \/>\n        <br \/>\n        f(x) = 1 if -1<x<1\n        <br \/>\n        f(x) = 0 otherwise<\/p>\n<p>        \uc801\ubd84 \uad6c\uac04\uc740 \uc6d0\ub798\ub294 \uc2e4\uc218 \uc804 \uad6c\uac04\uc774\uc9c0\ub9cc, \uc5b4\ucc28\ud53c \ub2e4\ub978 \uad6c\uac04\uc5d0\uc11c\ub294 0\uc774\ubbc0\ub85c, x\uac00 1\uc778 \uad6c\uac04\uc5d0\uc11c\ub9cc \uc801\ubd84\ud558\uba74 \ub41c\ub2e4.<br \/>\n        <br \/>\n        f(x)\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc744 g(k)\ub77c\uace0 \ud558\uba74<br \/>\n        <br \/>\n        $g(k) = \\frac{-2}{ik} sin(k)$<br \/>\n        <br \/>\n        \uc774 \uc801\ubd84\uc744 \uc5b4\ub5bb\uac8c \ud588\ub294\uc9c0 \uad81\uae08\ud55c \uc0ac\ub78c\uc740 \uc778\ud130\ub137 \uac80\uc0c9\uc744 \ud558\uc2dc\uae30 \ubc14\ub77c\uba70&#8230;<\/p>\n<p>        \ubcf4\ub2e4\uc2dc\ud53c, sinc\ud568\uc218\uac00 \ud280\uc5b4\ub098\uc654\ub2e4. \ubb3c\ub860 \uc774 \ud568\uc218\ub294 \uc5f0\uc18d\ud568\uc218\ub2e4. \uc774\uc81c, \uc9c1\uc0ac\uac01\ud615 \ud568\uc218\uac00 \uc8fc\uae30\uc801\uc73c\ub85c \ubcc0\ud558\ub294 \uacbd\uc6b0 \uc5b4\ub5bb\uac8c \ub418\ub294\uc9c0 \uc0b4\ud3b4\ubcf4\uc790.<br \/>\n        <br \/>\n        f(x) = 1 if 2n-1\/2 < x < 2n+1\/2 for any integer n\n        <br \/>\n        f(x) = 0 otherwise<br \/>\n        <br \/>\n        \uc774\ub7f0\uac70 \uc801\ubd84\ud558\ub824\uba74 \uc880 \uace8\uce58\uc544\ud50c\uac83 \uac19\uc9c0\ub9cc, \uc0ac\uc2e4 \uc800 \ud568\uc218\ub294 n\uc5d0 \ub300\ud574\uc11c \uc798 \uc815\uc758\ub41c \ud568\uc218\uc758 \ubb34\ud55c\uae09\uc218\ub2e4. \uac00\ub839<br \/>\n        <br \/>\n        $f_n(x) = 1$  if 2n-1\/2 < x < 2n+1\/2 for the given integer n\n        <br \/>\n        \uc774\ub807\uac8c \uc815\ud574\ub193\uace0 \ub098\uba74<br \/>\n        <br \/>\n        $f(x) = \\sum f_n(x)$<br \/>\n        <br \/>\n        \uc774\ub807\uac8c \ub41c\ub2e4. \ub530\ub77c\uc11c, \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc744 \ud560\ub54c\ub294 $f_n$\ub9cc \uc798 \ud574\uc8fc\uba74 \ub41c\ub2e4. \ub9c8\ucc2c\uac00\uc9c0\ub85c, \ud718\ub9ac\ub9ad \uacc4\uc0b0\ud574 \uc8fc\uba74<br \/>\n        <br \/>\n        $g_n (k) = exp(-2nik) \\frac{-2}{ik}sin(k\/2)$<br \/>\n        <br \/>\n        \uadf8\ub7fc<br \/>\n        <br \/>\n        $g(k) = \\sum g_n(k) = (cot(k) &#8211; i)\\frac{-4}{ik}sin(k\/2)$<br \/>\n        <br \/>\n        \uc74c&#8230;\uc0dd\uae34\uac8c \uc870\uae08 \uc774\uc0c1\ud558\uae34 \ud558\uc9c0\ub9cc, \uc544\ubb34\ud2bc sinc\ud568\uc218\uc5d0 \ub2e4\ub978 \ud568\uc218\ub97c \uacf1\ud55c \ud615\ud0dc\uac00 \ub4f1\uc7a5\ud588\ub2e4. (\uac80\uc0b0 \ud574\ubcf4\uae30 \ubc14\ub78c. \uc801\ubd84\ud55c \ub2e4\uc74c \ubb34\ud55c\uae09\uc218\uc758 \ud569 \uacf5\uc2dd\uc744 \uc4f0\uba74 \ub428.) \uc544\ub9c8 \uc774 \ud568\uc218\ub294 \uc5f0\uc18d\ud568\uc218\uc77c \uac83\uc774\ub2e4. (\ucd94\uce21\uc784. \uc99d\uba85\uc740 \uc548\ud574\ubd24\uc74c.)<\/p>\n<p>        \uadf8\ub7fc, \uc9c1\uc0ac\uac01\ud615 \ud568\uc218\uac00 \uc8fc\uae30\uc801\uc774\uc9c0 \uc54a\uc744 \ub54c\uc5d0\ub294 \uc5b4\ub5bb\uac8c \ub420\uae4c? \uc774\ubc88\uc5d4 f(x)\ub97c \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ud558\uc790.<br \/>\n        <br \/>\n        $f(x) = \\sum f_n(x)$<br \/>\n        <br \/>\n        $f_n(x) = 1 $ if a_n < x <b_n , where $[a_n, b_n]$ has no intersection with $ [a_m, b_m]$ for any integer m without the case m=n.\n        <br \/>\n        \uc774\uac83\ub3c4 \uc55e\uc11c \ud55c \uac83\uacfc \ub9c8\ucc2c\uac00\uc9c0\ub85c \ub300\ucda9 \uc801\ubd84\ud558\uace0 \ub367\uc148\uc73c\ub85c \uafb9 \ub20c\ub7ec\ub2f4\uc544 \uc8fc\uba74 \ub41c\ub2e4. \uadf8\ub7ec\ub098 \uc880 \uae4c\ub2e4\ub86d\uac8c \ub41c\ub2e4. \uc55e\uc5d0 \ub098\uc628 \uac83\ucc98\ub7fc \ud558\ub098\uc758 \ud568\uc218\uac00 \ub418\ub294 \uac83\uc774 \uc544\ub2c8\ub77c, \ubb34\ud55c\uae09\uc218\ub97c \uadf8\ub0e5 \ub194\ub46c\uc57c\ub9cc \ud55c\ub2e4.<br \/>\n        <br \/>\n        $g_n(k) = exp(-ik\\frac{b_n+a_n}{2})\\frac{-2}{ik} sin(\\frac{b_n-a_n}{2}k)$<br \/>\n        <br \/>\n        $g(k)=\\sum g_n(k)$<br \/>\n        <br \/>\n        \ub300\ucda9 \ubcf4\uba74, sinc\ud568\uc218\ub294 \ub9de\ub294\ub370, \uc55e\uc5d0 \uc0bc\uac01\ud568\uc218 \ud558\ub098\uac00 \uacf1\ud574\uc838 \uc788\ub2e4. \uc774\uac74 \uc65c \uc774\ub807\uac8c \ub418\uc5c8\uc744\uae4c? (\ubb3c\ub860 \uc774 \ud568\uc218\ub3c4 \uc5f0\uc18d\ud568\uc218\ub2e4. \uc544\ub9c8)<\/p>\n<p>        \ub450\uac00\uc9c0 \uacbd\uc6b0\uc758 \uc9c1\uc0ac\uac01\ud615 \ud568\uc218\uc5d0 \ub300\ud574\uc11c \ub2ec\ub77c\uc9c4 \uac83\uc740 \ub2e8\uc9c0 &#8220;\uc8fc\uae30\uc131&#8221; \ubfd0\uc774\ub2e4. \uc774\uc804\uc758 \uae00\uc5d0\uc11c, \uc8fc\uae30 \ud568\uc218\ub97c \ud478\ub9ac\uc5d0 \ubcc0\ud658 \ud558\uba74 \ud2b9\uc815\ud55c \uc9c4\ub3d9\uc218\uc758 \ud568\uc218\ub4e4\ub9cc \uc0b4\uc544\ub0a8\uac8c \ub41c\ub2e4\ub294 \uac83\uc744 \uc774\uc57c\uae30 \ud588\uc5c8\ub2e4. \ud558\uc9c0\ub9cc \ud568\uc218\uc5d0\uc11c \uc8fc\uae30\uc131\uc774 \uae68\uc838\ubc84\ub9ac\ub294 \uacbd\uc6b0, \uc8fc\uae30\ud568\uc218\uac00 \uc544\ub2cc \uac83\uc744 \uc8fc\uae30\ud568\uc218(\uc989, \uc0bc\uac01\ud568\uc218)\uc758 \ud569\uc73c\ub85c \ud45c\ud604\ud558\ub824\uba74 \ubaa8\ub4e0 \uc885\ub958\uc758 \uc8fc\uae30\uc131\uc774 \uc804\ubd80 \ub2e4 \ud3ec\ud568\ub418\uc5b4\uc57c \ud55c\ub2e4. \ub4a4\uc11e\uc5ec \ubc84\ub9ac\uc9c0 \uc54a\uc73c\uba74 \uc548\ub41c\ub2e4\ub294 \uac83\uc774\ub2e4.<\/p>\n<p>        \uc74c&#8230;\uadf8\ub7f0\ub370, \uc5b4\uca0c\ub4e0 impulse \ud615\ud0dc\ub294 \ubcf4\uc774\uc9c0 \uc54a\ub294\ub2e4. \uc5b4\ub5bb\uac8c \ub41c \uac78\uae4c. \ub0b4 \uacc4\uc0b0\uc774 \ud2c0\ub9b0\uac74\uac00?<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=1175\" 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>**\uc218\uc2dd\uc740 \uc778\ud130\ub137 \uc775\uc2a4\ud50c\ub85c\ub7ec\uc5d0\uc11c\ub294 \uc81c\ub300\ub85c \ud45c\ud604\ub418\uc9c0 \uc54a\uc74c. \ud30c\uc774\uc5b4\ud3ed\uc2a4 \uc6f9 \ube0c\ub77c\uc6b0\uc800\ub97c \uad8c\uc7a5\ud568. \uc9c1\uc0ac\uac01\ud615 \ud568\uc218\ub97c \ud478\ub9ac\uc5d0 \ubcc0\ud658 \ud574\ubcf4\uc790. \uac04\ub2e8\ud558\ub2e4. f(x) = 1 if -1<\/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-8370","post","type-post","status-publish","format-standard","hentry","category-academic"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8o6gA-2b0","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8370","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=8370"}],"version-history":[{"count":0,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8370\/revisions"}],"wp:attachment":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8370"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8370"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}