{"id":7632,"date":"2007-08-18T17:06:00","date_gmt":"2007-08-18T17:06:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=7632"},"modified":"2007-08-18T17:06:00","modified_gmt":"2007-08-18T17:06:00","slug":"%ed%91%b8%eb%a6%ac%ec%97%90-%eb%b3%80%ed%99%98fourier-transformation-3","status":"publish","type":"post","link":"http:\/\/melotopia.net\/b\/?p=7632","title":{"rendered":"\ud478\ub9ac\uc5d0 \ubcc0\ud658(Fourier Transformation) #3"},"content":{"rendered":"<div class=\"desc\">\n        \uc774\uc81c 3\ud3b8. \ubcf8\ud3b8\uc774\ub2e4.<\/p>\n<p>        \uae30\ubcf8\uc801\uc73c\ub85c \ud568\uc218 \uacf5\uac04\uc740 \ubb34\ud55c \ucc28\uc6d0 \uacf5\uac04\uc774\ub2e4. \ud558\uc9c0\ub9cc \ubc29\ud5a5\uc744 \uc801\ub2f9\ud788 \uc7a1\uc744 \uc218 \uc788\uc5b4\uc11c, \uc6d0\uc810\uc5d0\uc11c\ubd80\ud130 \uc6b0\ub9ac\uac00 \uc6d0\ud558\ub294 \ud568\uc218\uae4c\uc9c0 \uba87\uac78\uc74c \uac78\uc5b4\uac00\uba74 \ub3c4\ucc29\ud560 \uc218 \uc788\ub2e4. \uc774\ub54c, &#8220;\ubc29\ud5a5&#8221;\uc744 \uc7a1\uc544\uc8fc\ub294 \ud568\uc218\ub97c \uae30\uc800 \ubca1\ud130\ub77c\uace0 \ubd80\ub978\ub2e4.<\/p>\n<p>        \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \uae30\uc800 \ubca1\ud130\ub97c \uc0bc\uac01\ud568\uc218\ub85c \ub450\uace0\uc11c, \ud2b9\uc815 \ud568\uc218\uae4c\uc9c0 \uac78\uc5b4\uac00\ub824\uba74 \uc5b4\ub290 \ubc29\ud5a5\uc73c\ub85c \uba87\uac78\uc74c\uc529 \uac00\uba74 \ub418\ub294\uc9c0 \uc54c\ub824\uc8fc\ub294 \uac83\uc774\ub2e4.<\/p>\n<p>        \ud568\uc218\ub780 \uc6d0\ub798 \uc22b\uc790 \ud558\ub098\uc5d0 \ub2e4\ub978 \uc22b\uc790\ub97c \ub300\uc751\uc2dc\ud0a4\ub294 \uac83\uc774\ub2e4. \uc989, x\ub97c \uc8fc\uba74 y\ub97c \ub0b4\ub193\ub294 \uaddc\uce59\uc744 y=f(x)\ub77c\uace0 \uc815\ud55c \uac83\uc774\ub2e4. \uc989 \ud568\uc218\ub97c \ud45c\ud604\ud558\ub294 \ubc29\ubc95\uc740 \uc6d0\ub798 (x,y)\ub97c \uc804\ubd80 \ub2e4 \uacb0\uc815\ud574\uc11c \ucb49 \uc368\ub193\ub294 \uac83\uc774\ub2e4. \ud558\uc9c0\ub9cc \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc744 \ud558\uac8c \ub418\uba74 \uc0c8\ub85c\uc6b4 \ud45c\ud604 \ubc29\ubc95\uc774 \uc0dd\uae34\ub2e4.<\/p>\n<p>        \uc774\uac78 \uc2e4\uc0dd\ud65c\uc5d0\uc11c \uc77c\uc5b4\ub098\ub294 \uc77c\ub85c \ube44\uc720\ud574 \ubcf4\uc790\uba74, \ub300\ucda9 \uc774\ub807\uac8c \ub41c\ub2e4.<br \/>\n        <\/p>\n<div style=\"padding: 10px; background-color: rgb(208, 255, 157);\">\n         \uc6d4\uc694\uc77c &#8211; \uc591\uc790\uc5ed\ud559, \uace0\uc804\uc5ed\ud559<br \/>\n         <br \/>\n         \ud654\uc694\uc77c &#8211; \uc804\uc790\uae30\ud559, \uc591\uc790\uc5ed\ud559<br \/>\n         <br \/>\n         \uc218\uc694\uc77c &#8211; \uc591\uc790\uc5ed\ud559, \uace0\uc804\uc5ed\ud559<br \/>\n         <br \/>\n         \ubaa9\uc694\uc77c &#8211; \uc804\uc790\uae30\ud559, \ud1b5\uacc4\uc5ed\ud559, \uc591\uc790\uc5ed\ud559<br \/>\n         <br \/>\n         \uae08\uc694\uc77c &#8211; \uc591\uc790\uc5ed\ud559, \uace0\uc804\uc5ed\ud559\n        <\/div>\n<p>        \ubb3c\ub860 \uc800\uac74 \uc5b4\ub514\uae4c\uc9c0\ub098 \uc608\uc2dc\ub2e4. \uc800\ub7f0\uc2dd\uc73c\ub85c \ub054\ucc0d\ud55c \uc218\uc5c5 \uc2dc\uac04\ud45c\ub294 \uc874\uc7ac\ud558\uc9c0 \uc54a\ub294\ub2e4.<br \/>\n        <sup class=\"footnote\"><br \/>\n<a href=\"#footnote_420_1\" id=\"footnote_link_420_1\" onmouseout=\"tistoryFootnote.hide(420,1)\" onmouseover=\"tistoryFootnote.show(this,420,1)\" style=\"color:#f9650d;font-family:Verdana,Sans-serif\"><br \/>\n<span style=\"display:none\"><br \/>\n           [\uac01\uc8fc:<br \/>\n          <\/span><br \/>\n          1<br \/>\n          <span style=\"display:none\"><br \/>\n           ]<br \/>\n          <\/span><br \/>\n<\/a><br \/>\n<\/sup><br \/>\n        \uc989 x(=\uc694\uc77c)\uc5d0 y(=\uc218\uc5c5)\uc744 \ub300\uc751\uc2dc\ud0a8 \uac83\uc774\ub2e4. \uc800\uac78 \ud478\ub9ac\uc5d0 \ubcc0\ud658\ud558\uba74?<br \/>\n        <\/p>\n<div style=\"padding: 10px; background-color: rgb(250, 255, 169);\">\n         \ub9e4\uc77c &#8211; \uc591\uc790\uc5ed\ud559<br \/>\n         <br \/>\n         \uc774\ud2c0 \uc8fc\uae30 &#8211; \uace0\uc804\uc5ed\ud559, \uc804\uc790\uae30\ud559<br \/>\n         <br \/>\n         \uc77c\uc8fc\uc77c\uc5d0 \ud55c\ubc88 &#8211; \ud1b5\uacc4\uc5ed\ud559<br \/>\n         \n<\/div>\n<p>        \ubcc4\uac70 \uc5c6\ub2e4.<\/p>\n<p>        \uc751. \uc9c4\uc9dc \ubcc4\uac70 \uc5c6\ub2e4.<\/p>\n<p>        \uc9c0\uae08\uae4c\uc9c0 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc774 \ubcc4\uac70\ub77c\uace0 \uc0dd\uac01\ud588\ub358 \uc0ac\ub78c\ub4e4\uc740 \ub354\uc774\uc0c1 \uac81\ub0bc \ud544\uc694\uac00 \uc5c6\ub2e4. \uc774\ubbf8 \uc800\ub7f0\uc2dd\uc73c\ub85c \ubcc0\ud658\ud558\ub294 \uac74 \ucd08\ub4f1\ud559\uad50\ub54c\ubd80\ud130 \uc5f4\uc2ec\ud788 \ud574\uc624\uc9c0 \uc54a\uc558\ub358\uac00. \uacfc\ubaa9\uba85 \ubfd0\ub9cc\uc774 \uc544\ub2c8\ub77c, \uc544\ubb34\ud2bc \uc774\ub984\uc744 \ubd99\uc5ec\ub193\uace0 \uc8fc\uae30\uc801\uc73c\ub85c \ud558\ub294 \ud589\ub3d9\uc740 \ud56d\uc0c1 \uc2dc\uac04 \ubcc0\uc218\uc5d0\uc11c \uc774\ub984(\uc8fc\uae30 \ud3ec\ud568) \ubcc0\uc218 \uc601\uc5ed\uc73c\ub85c \ub118\uae38 \uc218\uac00 \uc788\ub2e4.<br \/>\n        <br \/>\n        \uc218\ud559\uc801\uc778 \uc608\ub97c \ub4e4\uba74 f(x) = 2sin(x) + 3sin(2x) \ub85c \ud45c\ud604\ud55c \uac83\uacfc \uac19\ub2e4\ub294 \uac83\uc774\ub2e4. \uc774\ub807\uac8c \ud45c\ud604\ud55c f(x)\ub294 \uc8fc\uae30 1\uc9dc\ub9ac\uac00 2\uac1c \uc788\uace0 \uc8fc\uae30 2\uc9dc\ub9ac\uac00 3\uac1c \uc788\ub294 \uac83\uc774\ub2e4.<br \/>\n        <br \/>\n        \uc800\ub7ec\uba74 \uc774\uc81c (\uc8fc\uae301 , 2\uac1c) (\uc8fc\uae302, 3\uac1c) \ub4f1\ub4f1\uc73c\ub85c \ud45c\ud604\ud560 \uc218\uac00 \uc788\uac8c \ub41c\ub2e4. \uadf8\ub7fc \uc774\uc81c \uc8fc\uae30 -> \uac2f\uc218 \uc778 \ud568\uc218\ub97c \uacb0\uc815\ud560 \uc218 \uc788\ub2e4. \uc989 \uac2f\uc218=g(\uc8fc\uae30)\ub77c\ub294 \ud568\uc218\uac00 \ub41c\ub2e4. \uc880 \uba4b\uc9c0\uac8c \uc4f0\uba74 z=g(k)\uac00 \ub41c\ub2e4.\ubb3c\ub860 z\ub294 \uac2f\uc218\uace0 k\ub294 \uc8fc\uae30\ub2e4.<\/p>\n<p>        \uc57d\uac04 \uc5b4\ub835\uac8c \uc598\uae30\ud558\uba74 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 y=f(x)\ub85c\ubd80\ud130 z=g(k)\ub97c \ucc3e\uc544\ub0b4\ub294 \uacfc\uc815 \uadf8 \uc790\uccb4\ub97c \ub9d0\ud55c\ub2e4. \uadf8\ub9ac\uace0, \uc774\uac74 \uc544\uc8fc \ub180\ub77c\uc6b0\uba74\uc11c \ubbf8\uce60\ub4ef\uc774 \ub2f9\uc5f0\ud55c \uc598\uae30\uc778\ub370, g(k)\ub97c \ub2e4\uc2dc \ud478\ub9ac\uc5d0 \ubcc0\ud658\ud558\uba74 f(x)\uac00 \ub098\uc624\uac8c \ub41c\ub2e4. \uc774\uac78 \uc5ed \ud478\ub9ac\uc5d0 \ubcc0\ud658(Inverse fourier transformation)\uc774\ub77c\uace0 \uae38\uac8c \ubd80\ub974\uae30\ub3c4 \ud55c\ub2e4. \ubb50 \uadf8\ub188\uc774\ub098 \uadf8\ub188\uc774\ub098.<br \/>\n        <br \/>\n        \uc2ac\uc2ac \uac10\uc774 \uc624\ub294\uac00?<\/p>\n<p>        \uadf8\ub7fc \ub2e4\uc74c 4\ud3b8\uc5d0\uc11c\ub294 \ubcf8\uaca9\uc801\uc73c\ub85c \uc218\uc2dd\uc744 \ub2e4\ub904\ubcf4\ub3c4\ub85d \ud558\uaca0\ub2e4.<br \/>\n        <br \/>\n        (To have to be continued&#8230;)<br \/>\n        <\/p>\n<div class=\"footnotes\">\n<ol class=\"footnotes\">\n<li id=\"footnote_420_1\">\n           \ub9cc\uc57d \uc800\ub807\uac8c \ub4e3\ub294 \uc0ac\ub78c\uc774 \uc788\ub2e4\uba74, \uadf8\uc758 \uba85\ubcf5\uc744 \ube48\ub2e4.<br \/>\n           <a href=\"#footnote_link_420_1\"><br \/>\n            [\ubcf8\ubb38\uc73c\ub85c]<br \/>\n           <\/a>\n<\/li>\n<\/ol>\n<\/div>\n<p><script type=\"text\/javascript\">\n         tistoryFootnote.add(420,1,\"\\ub9cc\\uc57d \\uc800\\ub807\\uac8c \\ub4e3\\ub294 \\uc0ac\\ub78c\\uc774 \\uc788\\ub2e4\\uba74, \\uadf8\\uc758 \\uba85\\ubcf5\\uc744 \\ube48\\ub2e4.\");\n        <\/script><\/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=420\" 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>\uc774\uc81c 3\ud3b8. \ubcf8\ud3b8\uc774\ub2e4. \uae30\ubcf8\uc801\uc73c\ub85c \ud568\uc218 \uacf5\uac04\uc740 \ubb34\ud55c \ucc28\uc6d0 \uacf5\uac04\uc774\ub2e4. \ud558\uc9c0\ub9cc \ubc29\ud5a5\uc744 \uc801\ub2f9\ud788 \uc7a1\uc744 \uc218 \uc788\uc5b4\uc11c, \uc6d0\uc810\uc5d0\uc11c\ubd80\ud130 \uc6b0\ub9ac\uac00 \uc6d0\ud558\ub294 \ud568\uc218\uae4c\uc9c0 \uba87\uac78\uc74c \uac78\uc5b4\uac00\uba74 \ub3c4\ucc29\ud560 \uc218 \uc788\ub2e4. \uc774\ub54c, &#8220;\ubc29\ud5a5&#8221;\uc744 \uc7a1\uc544\uc8fc\ub294 \ud568\uc218\ub97c \uae30\uc800 \ubca1\ud130\ub77c\uace0 \ubd80\ub978\ub2e4. \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \uae30\uc800 \ubca1\ud130\ub97c \uc0bc\uac01\ud568\uc218\ub85c \ub450\uace0\uc11c, \ud2b9\uc815 \ud568\uc218\uae4c\uc9c0 \uac78\uc5b4\uac00\ub824\uba74 \uc5b4\ub290 \ubc29\ud5a5\uc73c\ub85c \uba87\uac78\uc74c\uc529 \uac00\uba74 \ub418\ub294\uc9c0 \uc54c\ub824\uc8fc\ub294 \uac83\uc774\ub2e4. \ud568\uc218\ub780 \uc6d0\ub798 \uc22b\uc790 \ud558\ub098\uc5d0 \ub2e4\ub978 \uc22b\uc790\ub97c \ub300\uc751\uc2dc\ud0a4\ub294 \uac83\uc774\ub2e4. [&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-7632","post","type-post","status-publish","format-standard","hentry","category-academic"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8o6gA-1Z6","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/7632","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=7632"}],"version-history":[{"count":0,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/7632\/revisions"}],"wp:attachment":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7632"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7632"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7632"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}