{"id":8139,"date":"2008-08-22T14:38:00","date_gmt":"2008-08-22T14:38:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=8139"},"modified":"2008-08-22T14:38:00","modified_gmt":"2008-08-22T14:38:00","slug":"%ed%9a%8c%ec%a0%84%ec%b2%b4%ec%9d%98-%ea%b2%89%eb%84%93%ec%9d%b4","status":"publish","type":"post","link":"http:\/\/melotopia.net\/b\/?p=8139","title":{"rendered":"\ud68c\uc804\uccb4\uc758 \uac89\ub113\uc774"},"content":{"rendered":"
\n \ud68c\uc804\uccb4\uc758 \uac89\ub113\uc774 \uacc4\uc0b0\ubc95<\/p>\n

\ub113\uc774\ub294 \uc5b4\uca0c\ub4e0 2\uc911 \uc801\ubd84\uc744 \uc798 \ud574\uc8fc\uba74 \ub41c\ub2e4.<\/p>\n

f(x)>0\uc778 \ud568\uc218\ub97c \uc801\ub2f9\ud55c \uad6c\uac04\uc5d0\uc11c x\ucd95\uc744 \uc911\uc2ec\uc73c\ub85c \ud68c\uc804\uc2dc\ucf1c\uc11c \ud68c\uc804\uccb4\ub97c \ub9cc\ub4e4\uc5c8\ub2e4\uace0 \ud558\uace0, x=[a,b]\uc778 \uad6c\uac04\uc5d0\uc11c \ud68c\uc804\uac01 $\\theta$\uc5d0 \ud574\ub2f9\ud558\ub294 \ub113\uc774\ub294 \uc5b4\ub5bb\uac8c \uad6c\ud560\uae4c?<\/p>\n

\uc801\ubd84\uc740 \uc5b4\uca0c\ub4e0 \uba74\uc801\uc18c\ub97c \uc798 \uc7a1\uc73c\uba74 \ub418\ub294\ub370, \uc5b4\uca0c\ub4e0 $ds$\ub97c \uc5b4\ub5bb\uac8c \uc7a1\ub290\ub0d0\uac00 \uad00\uac74\uc774\ub2e4.
\n
\n \uc88c\ud45c\uacc4\ub97c \ud68c\uc804\uc88c\ud45c\uacc4\ub85c \uc7a1\uc73c\uba74 \ub3cc\uc544\uac00\ub294 \ubc29\ud5a5 $\\theta$\ubc29\ud5a5\uc73c\ub85c\ub294 \uae38\uc774\uac00 $f(x)d\\theta$\ub9cc\ud07c\uc77c \uac83\uc774\uace0, x\ubc29\ud5a5\uc73c\ub85c\ub294 \uae38\uc774\uac00 $\\sqrt{dx^2 + df^2}$ (\ud53c\ud0c0\uace0\ub77c\uc2a4 \uc815\ub9ac \uc0ac\uc6a9) \uc77c \ud14c\ub2c8\uae4c, $\\sqrt{1+(df\/dx)^2} dx$\uac00 \uae38\uc774\uac00 \ub41c\ub2e4.
\n
\n \uadf8\ub7fc \ub113\uc774\ub294 \uac00\ub85c x \uc138\ub85c \uc774\ubbc0\ub85c $ds=f(x)\\sqrt{1+(df\/dx)^2}d\\theta dx$\uac00 \ub41c\ub2e4.<\/p>\n

\uc774\uc81c \uc801\ubd84\ub9cc \uc798 \ud558\uba74 \ub41c\ub2e4. \uc6d0\ud558\ub294 \ub113\uc774\ub97c S\ub77c\uace0 \ud558\uba74,<\/p>\n

$S = \\int_{x=[a,b],\\theta=[0,\\Theta]} f(x)\\sqrt{1+(df\/dx)^2}d\\theta dx $<\/p>\n

\uc774 \uc801\ubd84\uc744 \uc798 \ud574\uc8fc\uba74 \ub41c\ub2e4.<\/p>\n

**\uc218\uc2dd \ud50c\ub7ec\uadf8\uc778\uc774 \uc880 \uc774\uc0c1\ud558\uac8c \uc791\ub3d9\ud574\uc11c \uc218\uc2dd\uc774 \uc774\uc0c1\ud558\uac8c \ubcf4\uc785\ub2c8\ub2e4. 2\uc790\ub294 \ubaa8\ub450 \uc81c\uacf1\uc758 \uc758\ubbf8\ub85c \uc0ac\uc6a9\ub41c \uc22b\uc790\ub4e4\uc774\uc608\uc694.
\n
\n **\ud30c\uc774\uc5b4\ud3ed\uc2a4\uc5d0\uc11c\ub294 \uc815\uc0c1\uc801\uc73c\ub85c \ubcf4\uc774\uace0 IE\uc5d0\uc11c\ub294 \uc774\uc0c1\ud558\uac8c \ubcf4\uc77c \uac81\ub2c8\ub2e4.
\n <\/p>\n

\n
\n
\n\"\uc2e0\uace0\"
\n<\/a>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

\ud68c\uc804\uccb4\uc758 \uac89\ub113\uc774 \uacc4\uc0b0\ubc95 \ub113\uc774\ub294 \uc5b4\uca0c\ub4e0 2\uc911 \uc801\ubd84\uc744 \uc798 \ud574\uc8fc\uba74 \ub41c\ub2e4. f(x)>0\uc778 \ud568\uc218\ub97c \uc801\ub2f9\ud55c \uad6c\uac04\uc5d0\uc11c x\ucd95\uc744 \uc911\uc2ec\uc73c\ub85c \ud68c\uc804\uc2dc\ucf1c\uc11c \ud68c\uc804\uccb4\ub97c \ub9cc\ub4e4\uc5c8\ub2e4\uace0 \ud558\uace0, x=[a,b]\uc778 \uad6c\uac04\uc5d0\uc11c \ud68c\uc804\uac01 $\\theta$\uc5d0 \ud574\ub2f9\ud558\ub294 \ub113\uc774\ub294 \uc5b4\ub5bb\uac8c \uad6c\ud560\uae4c? \uc801\ubd84\uc740 \uc5b4\uca0c\ub4e0 \uba74\uc801\uc18c\ub97c \uc798 \uc7a1\uc73c\uba74 \ub418\ub294\ub370, \uc5b4\uca0c\ub4e0 $ds$\ub97c \uc5b4\ub5bb\uac8c \uc7a1\ub290\ub0d0\uac00 \uad00\uac74\uc774\ub2e4. \uc88c\ud45c\uacc4\ub97c \ud68c\uc804\uc88c\ud45c\uacc4\ub85c \uc7a1\uc73c\uba74 \ub3cc\uc544\uac00\ub294 \ubc29\ud5a5 $\\theta$\ubc29\ud5a5\uc73c\ub85c\ub294 \uae38\uc774\uac00 $f(x)d\\theta$\ub9cc\ud07c\uc77c \uac83\uc774\uace0, x\ubc29\ud5a5\uc73c\ub85c\ub294 \uae38\uc774\uac00 $\\sqrt{dx^2 + df^2}$ (\ud53c\ud0c0\uace0\ub77c\uc2a4 \uc815\ub9ac […]<\/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-8139","post","type-post","status-publish","format-standard","hentry","category-academic"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8o6gA-27h","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8139","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=8139"}],"version-history":[{"count":0,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8139\/revisions"}],"wp:attachment":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8139"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8139"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8139"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}