{"id":8367,"date":"2009-01-30T16:15:00","date_gmt":"2009-01-30T16:15:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=8367"},"modified":"2009-01-30T16:15:00","modified_gmt":"2009-01-30T16:15:00","slug":"%eb%b9%84%ec%a3%bc%ea%b8%b0-%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=8367","title":{"rendered":"\ube44\uc8fc\uae30 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658"},"content":{"rendered":"
\n \ubc29\uba85\ub85d\uc5d0 \uc9c8\ubb38\uc774 \ub4e4\uc5b4\uc654\ub2e4.<\/p>\n

\ud765\ubbf8\ub85c\uc6b4 \uc9c8\ubb38\uc774\ub2e4 – \ube44\uc8fc\uae30 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \uc5b4\uc9f8\uc11c \uc5f0\uc18d \ud568\uc218\uac00 \ub418\ub294\uac00?
\n
\n \uadf8\uac83\ub3c4, \uc218\ud559 \uacf5\uc2dd \uc5c6\uc774 \uac1c\ub150\uc73c\ub85c\ub9cc \uc124\uba85\ud574 \ub2ec\ub77c\ub294 \uc694\uccad\uc774\ub2e4. \ud760…\ud55c\ubc88 \uc2dc\ub3c4\ud574 \ubcf8\ub2e4.
\n
\n \uc774 \uae00\uc740 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc758 \uae30\ucd08\uc801\uc778 \uacf5\uc2dd\uacfc \uac1c\ub150\uc740 \uc54c\uace0 \uc788\ub2e4\ub294 \uac00\uc815 \ud558\uc5d0 \uc791\uc131\ub418\uc5c8\ub2e4.<\/p>\n

\uc790. \ubc18\ub300\ub85c \uc9da\uc5b4\ubcf4\uc790. \uc8fc\uae30 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \uc5b4\uc9f8\uc11c \ubd88\uc5f0\uc18d\ud568\uc218\uac00 \ub420\uae4c? \uc7a0\uae50…! \uadf8 \uc804\uc5d0, \uc8fc\uae30 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc774 \uc5b4\ub5bb\uac8c \ub418\ub294\uc9c0, \uadf8\uac78 \uba3c\uc800 \uc0dd\uac01\ud574 \ubcf4\uc790.<\/p>\n

\uc8fc\uae30 \ud568\uc218\uc758 \uac00\uc7a5 \uac04\ub2e8\ud55c \uc6d0\ud615\uc740 \uc0bc\uac01\ud568\uc218\ub2e4. \uac00\ub839, \uc0ac\uc778\ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \ub378\ud0c0 \ud568\uc218\uac00 \ub098\uc628\ub2e4. (\ub514\ub799\uc758 \ub378\ud0c0 \ud568\uc218) \uadf8\uac83\uc740 \uc815\ud655\ud788 \ubc14\ub85c \uadf8 \uc8fc\ud30c\uc218 \uc131\ubd84 \uc774\uc678\uc5d0\ub294 \uc5c6\uae30 \ub54c\ubb38\uc774\ub2e4. \uc774\uac83\uc740, \ub378\ud0c0 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc774 \uc0bc\uac01\ud568\uc218\ub77c\ub294 \uac83\uc744 \uc0dd\uac01\ud574 \ubcf4\uba74 \ub2f9\uc5f0\ud560 \uc218\ubc16\uc5d0 \uc5c6\ub2e4.<\/p>\n

1. \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \uc5b4\ub5a4 \ubcc0\uc218 \uc601\uc5ed\uacfc \uadf8 \ubcc0\uc218\uc758 \uc9c4\ub3d9\uc218 \uc601\uc5ed\uc744 \uc11c\ub85c \ubcc0\ud658\ud55c\ub2e4.
\n
\n 2. \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \ud568\uc218\ub97c “\uc11c\ub85c \ub2e4\ub978 \uc9c4\ub3d9\uc218\ub97c \uac00\uc9c4 \uc0bc\uac01\ud568\uc218\uc758 \ud569”\uc73c\ub85c\uc11c \ud45c\ud604\ud55c\ub2e4.
\n
\n 3. “\uc5b4\ub5a4 \ud568\uc218”\uac00 \uc788\ub294\ub370, \uadf8 \ud568\uc218\uc758 \uc9c4\ub3d9\uc218\uac00 \uc815\ud655\ud788 1\uac1c\ubc16\uc5d0 \uc5c6\ub2e4
\n
\n 4. \uadf8\ub7fc \ub2f9\uc5f0\ud788 \uadf8 \ud568\uc218\ub294 \uc0bc\uac01\ud568\uc218\uc774\uace0, \uc9c4\ub3d9\uc218\uac00 \uc815\ud574\uc9c4 \uc0bc\uac01\ud568\uc218\uc77c \uc218\ubc16\uc5d0 \uc5c6\ub2e4.<\/p>\n

\uc7a0\uae50. \ub2e4\uc2dc. \uadf8\ub7f0\ub370, \ud1b1\ub2c8 \ubaa8\uc591\uc758 \ud568\uc218\uc778 \uacbd\uc6b0\ub294? \uacc4\uc0b0\ud558\uae30 \uadc0\ucc2e\uc73c\ubbc0\ub85c \uac80\uc0c9\uc744 \ud65c\uc6a9\ud558\uc790.
\n
\n
\n http:\/\/www.math.gatech.edu\/~harrell\/pde\/ch4wr.html
\n <\/a>
\n
\n \uc5ec\uae38 \ucc38\uace0\ud558\uba74, \ud1b1\ub2c8 \ubaa8\uc591\uc758 \ud568\uc218\ub294 \ud478\ub9ac\uc5d0 \ubcc0\ud658\ud558\uba74 \ud1b1\ub2c8 \ubaa8\uc591\uc758 \ud568\uc218\uac00 \uac16\ub294 \uc9c4\ub3d9\uc218\uc758 \uc815\uc218\ubc30 \uc9c4\ub3d9\uc218\ub97c \uac00\uc9c0\ub294 \uc0bc\uac01\ud568\uc218\ub4e4\ub9cc\uc758 \ud569\uc73c\ub85c \ud45c\ud604\uc774 \ub41c\ub2e4. \uc989, \uc774 \uacbd\uc6b0\uc5d0\ub3c4 \uc9c4\ub3d9\uc218\uc758 \uc2a4\ud399\ud2b8\ub7fc\uc740 \ubd88\uc5f0\uc18d\uc801\uc73c\ub85c \ubcc0\ud55c\ub2e4.<\/p>\n

\uc2a4\ud399\ud2b8\ub7fc\uc774\ub780? – \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc744 \ud588\uc744 \ub54c, \ud2b9\uc815 \uc9c4\ub3d9\uc218\uc758 \uc0bc\uac01\ud568\uc218\uac00 \uac16\ub294 \uc9c4\ud3ed\uc758 \ud06c\uae30. \ub2e4\ub978\ub9d0\ub85c\ub294, \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc744 \ud55c \ubaa9\uc801\ud568\uc218. \uc2a4\ud399\ud2b8\ub7fc\uc744 \ub2e4\uc2dc\ud55c\ubc88 \ud478\ub9ac\uc5d0 \ubcc0\ud658\ud558\uba74 \uc6d0\ub798\uc758 \ud568\uc218\uac00 \ub4f1\uc7a5\ud55c\ub2e4.<\/p>\n

\uc65c\uadf8\ub7f4\uae4c? \uc65c?
\n
\n \uc8fc\uae30 \ud568\uc218\uc778 \uacbd\uc6b0 x\uc5d0\ub2e4\uac00 \ud2b9\uc815 \uc8fc\uae30 T\ub97c \ub354\ud558\uba74 \uc6d0\ub798\uc758 \ud568\uc218\uac00 \uadf8\ub300\ub85c \ub098\uc640\uc57c \ud55c\ub2e4. \uc989, f(x)\uc640 f(x+T)\ub294 \uac19\uc740 \ud568\uc218 \uac12\uc744 \uac16\uac8c \ub41c\ub2e4. \uc0bc\uac01\ud568\uc218\uc5d0\ub2e4\uac00 \ud2b9\uc815 x\ub97c \ud558\ub098 \uc815\ud574\ub193\uace0, T\ub97c \uc544\ubb34\uac70\ub098 \ub354\ud574\ubd10\ub77c. \uadf8\ub798\ubd10\uc57c cos(x)\uc640 cos(x+T)\uac00 \uac19\uc744 \uac00\ub2a5\uc131\uc740 \uc804\ubb34\ud558\ub2e4. \uc774\uac78 \uac19\uac8c \ub9de\ucd94\uae30 \uc704\ud574\uc11c\ub294 T\ub97c \uad49\uc7a5\ud788 \uc798 \uace8\ub77c\uc57c \ud55c\ub2e4. \ubb3c\ub860, \uc0c1\uc2dd\uc801\uc73c\ub85c T\ub294 $2\\pi$\uc758 \uc815\uc218\ubc30\uac00 \ub418\uba74 OK\ub2e4. \uc5ec\uae30\uc11c \ud78c\ud2b8\ub97c \uc5bb\uc5b4\uc57c \ud55c\ub2e4. T\ub294 \ud2b9\uc815\ud55c \uc22b\uc790\uc758 \uc815\uc218\ubc30\uac00 \ub418\uc9c0 \uc54a\uc73c\uba74 \uc548\ub41c\ub2e4.<\/p>\n

\ud478\ub9ac\uc5d0 \ubcc0\ud658\uc774\ub77c\ub294 \uac83\uc774 \uc6d0\ub798 \ud568\uc218\ub97c \uc0bc\uac01\ud568\uc218\ub85c \ud45c\ud604\ud558\uace0 \uc2f6\uc5c8\ub358 \uac83\uc774\ubbc0\ub85c, \uc6d0\ub798 \ud568\uc218\uc640 \uc0bc\uac01\ud568\uc218\uc758 \ud569\uc774 \uc11c\ub85c \uac19\uc73c\ub824\uba74, \uc0bc\uac01\ud568\uc218\uc5d0 \ub4e4\uc5b4\uac00\ub294 \uc8fc\uae30 T\ub294 \uc6d0\ub798 \ud568\uc218\uc758 \uc8fc\uae30 T\uc640 \uac19\uc544\uc57c\ub9cc \ud55c\ub2e4. \ubc14\ub85c \uc55e\uc758 \uc124\uba85\uc5d0\uc11c\ub294 \uc8fc\uae30 T\ub97c \uadf8\ub0e5 $2\\pi$\uc758 \uc815\uc218\ubc30\ub85c \ub9de\ucd9c \uc218 \uc788\uc5c8\uc9c0\ub9cc, \uc774\ubc88\uc5d4 \ubc18\ub300\ub85c \uc8fc\uae30 T \uc790\uccb4\ub294 \uacb0\uc815\ub418\uc5b4 \uc788\ub294 \uc0c1\ud0dc\ub2e4. (T\ub97c \ubc14\uafbc\ub2e4\ub294\uac74 \uc6d0\ub798 \ud568\uc218\ub97c \ubc14\uafbc\ub2e4\ub294 \ub73b\uc774\ubbc0\ub85c \ub9d0\ub3c4 \uc548\ub418\ub294 \uc598\uae30\ub2e4) \uadf8\ub7fc \uc5b4\ub5bb\uac8c \ud574\uc57c \ud560\uae4c? \uc911\uc774 \uc2eb\uc73c\uba74 \uc808\uc744 \ub5a0\ub098\uc57c \ud55c\ub2e4\uace0…
\n
\n \uc0bc\uac01\ud568\uc218\uac00 \ub9de\ucdb0\uc8fc\ub294 \uc218\ubc16\uc5d0 \uc5c6\ub2e4. \uc989, \uc8fc\uae30 T\uac00 $2\\pi$\uc758 \uc815\uc218\ubc30\uac00 \ub418\ub3c4\ub85d \ud558\ub294 \uc9c4\ub3d9\uc218\ub97c \uc120\ud0dd\ud574\uc57c\ub9cc \ud55c\ub2e4. \ub530\ub77c\uc11c, \uc774\ubc88\uc5d4 \uac70\uafb8\ub85c \ud2b9\uc815 \uc9c4\ub3d9\uc218\uc5d0 \ud574\ub2f9\ud558\ub294 \uc0bc\uac01\ud568\uc218\ub4e4\ub9cc \uc0b4\uc544\ub0a8\uc744 \uc218\ubc16\uc5d0 \uc5c6\ub2e4.<\/p>\n

\uc790. \uc774\uc81c \uc6d0\ub798\uc758 \uc9c8\ubb38\uc73c\ub85c \ub3cc\uc544\uc640\uc11c, \ube44\uc8fc\uae30 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc774 \uc65c \uc5f0\uc18d\ud568\uc218\uac00 \ub098\uc624\ub294\uc9c0 \uc0dd\uac01\ud574 \ubcf4\uc790. \uc7a0\uae50 – \uc774 \uba85\uc81c\uc758 \ub300\uc6b0\ub97c \uc0dd\uac01\ud574 \ubcf4\uc790. \ubd88\uc5f0\uc18d\ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \uc8fc\uae30 \ud568\uc218\uc77c\uae4c?
\n
\n \uc774\ub807\uac8c \uc0dd\uac01\ud558\ub294\uac74 \uc774\uc0c1\ud558\uc9c0 \uc54a\ub2e4. \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc758 \uc5ed \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \ub610\ud55c \uadf8 \uc790\uccb4\ub85c \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc774\ub2e4. \uadf8\ub9ac\uace0 \ubaa8\ub4e0 \ud568\uc218\ub294 \uc8fc\uae30\ud568\uc218\uc774\uac70\ub098 \ube44\uc8fc\uae30 \ud568\uc218\uc774\uace0, \ubaa8\ub4e0 \ud568\uc218\ub294 \uc5f0\uc18d\ud568\uc218\uc774\uac70\ub098 \ubd88\uc5f0\uc18d\ud568\uc218\uc774\ub2e4. \ub530\ub77c\uc11c \ub300\uc6b0 \uba85\uc81c\ub85c\uc11c \uc798 \uc131\ub9bd\ud55c\ub2e4.
\n
\n \ubd88\uc5f0\uc18d\ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \ub2f9\uc5f0\ud788 \uc8fc\uae30 \ud568\uc218\ub2e4. -> \uc774\uc0c1\ud558\ub2e4<\/p>\n

\uac00\ub839, \uc798 \uc815\uc758\ub41c \ubd88\uc5f0\uc18d\ud568\uc218\ub85c \ub2e4\uc74c\uacfc \uac19\uc740 \uac83\uc774 \uc788\ub2e4.
\n
\n f(x) = 1 (x\uac00 \uc720\ub9ac\uc218)
\n
\n f(x) = 0 (x\uac00 \ubb34\ub9ac\uc218)<\/p>\n

\uc774\ub7f0 \ud568\uc218\ub97c \ud478\ub9ac\uc5d0 \ubcc0\ud658\ud558\uba74 \uc5b4\ub5bb\uac8c \ub420\uae4c?
\n
\n \uc74c…\uc774 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740, \ub180\ub78d\uac8c\ub3c4, 0\uc774\ub2e4. (\ucd94\uce21\uc774\uae34 \ud558\uc9c0\ub9cc, \uc544\ub9c8 \ub9de\uc744 \uac70\ub2e4 -_-; \uc800 \ud568\uc218\ub294 measure\uac00 0\uc774\ub77c\uc11c \uc801\ubd84\ud558\uba74 0\uc774\uace0, \uc800\uae30\uc5d0 \ubb58 \uacf1\ud574\uc11c \uc801\ubd84\ud574\ub3c4 0\uc77c \uc218\ubc16\uc5d0 \uc5c6\ub2e4. \uc774\uac78 \uc5b4\ub5bb\uac8c \uc801\ubd84\ud558\uace0, \uc801\ubd84\uac12\uc774 \uc65c 0\uc778\uc9c0\ub294 Lebesgue \uc801\ubd84\ub860\uc744 \uc774\ud574\ud574\uc57c \ud55c\ub2e4.)
\n
\n \ubbf8\uc548\ud558\ub2e4. \ucc98\uc74c\ubd80\ud130 \ubc18\ub840\uac00 \ub098\uc654\ub2e4. (0\ud568\uc218\ub294 \uc0c1\uc218\ud568\uc218\uc774\uace0, \uc0c1\uc218\ud568\uc218\ub294 \uc8fc\uae30\ud568\uc218\ub2e4. \ub530\ub77c\uc11c \uc774 \uc608\ub294 \ub0b4\uac00 \uc798\ubabb \ub4e4\uc5c8\ub2e4.)<\/p>\n

\ub2e4\ub978 \ud568\uc218\ub97c \uc120\ud0dd\ud574 \ubcf4\uaca0\ub2e4.
\n
\n $f(x) = \\sum _{n=1}^{\\inf} \\delta(x-\\frac{1}{n})$
\n
\n \uc774 \ud568\uc218\ub294 \ub378\ud0c0 \ud568\uc218\ub97c \uc880 \ub9ce\uc774 \ub354\ud55c \uac83\uc774\ub2e4. \ud655\uc2e4\ud558\uac8c \ubd88\uc5f0\uc18d\uc774\ub2e4. \uc774 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \uacc4\uc0b0\ud558\uae30 \uc27d\ub2e4.
\n
\n $g(k) = \\sum _{n=1} ^{\\inf} exp(i (\\frac{k}{n})$
\n
\n \ubcf4\ub2e4\uc2dc\ud53c, \uc774 \ud568\uc218\ub294 \uc804\ud600 \uc8fc\uae30\uc801\uc774\uc9c0 \uc54a\ub2e4. \uc8fc\uae30\uac00 \uc11c\ub85c \ub2e4\ub978 \uc0bc\uac01\ud568\uc218\ub97c \ubaa8\ub450 \ub354\ud588\uae30 \ub54c\ubb38\uc774\ub2e4. \uc989, \ube44\uc8fc\uae30 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc774\ub77c\uace0 \ud574\ub3c4 \ud56d\uc0c1 \uc5f0\uc18d\ud568\uc218\uac00 \ub098\uc624\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4.<\/p>\n

\uadf8\ub7fc \ud754\ud788 \uc218\ud559\uc790\ub4e4\uc774 \uc0dd\uac01\ud558\ub294 \ub300\ub85c, \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc744 \ud588\ub294\ub370 \uc5f0\uc18d\ud568\uc218\uac00 \ub098\uc624\ub294 \uacbd\uc6b0\ub294 \ub3c4\ub300\uccb4 \uc5b4\ub5a4 \uacbd\uc6b0\uc77c\uae4c?
\n
\n \uc5f0\uc18d\ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \uc5f0\uc18d\ud568\uc218\uc778\uac00? \uc544\ub2c8\ub2e4. \uc0ac\uc778 \ud568\uc218 1\uac1c\ub97c \ud478\ub9ac\uc5d0 \ubcc0\ud658\ud558\uba74 \uc5f0\uc18d\uc774 \uc544\ub2cc \ud568\uc218\uac00 \ub098\uc628\ub2e4.
\n
\n \ube44\uc8fc\uae30 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \uc5f0\uc18d\ud568\uc218\uc778\uac00? \uc544\ub2c8\ub2e4. \uc55e\uc11c \uc124\uba85\ud588\ub4ef, \ubc18\ub840\uac00 \uc788\ub2e4.
\n
\n \uadf8\ub7fc, \uc5f0\uc18d\uc778 \ube44\uc8fc\uae30 \ud568\uc218\uc758 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc740 \uc5f0\uc18d\ud568\uc218\uc778\uac00? \ubb3c\ub860 \uc544\ub2c8\ub2e4. \ubc29\uae08 \uc124\uba85\ud55c \ubc18\ub840\ub294 \uc5f0\uc18d\uc778 \ud568\uc218\ub2e4.<\/p>\n

\ud760…\uc774 \uc870\uac74\uc740 \uc7a0\uae50 \uc0dd\uac01\ud574\uc11c\ub294 \ub2f5\uc774 \ub098\uc624\uc9c0 \uc54a\uc744 \uac83 \uac19\ub2e4. \uc77c\ub2e8, \uc5ec\uae30\uae4c\uc9c0\uc758 \uacb0\ub860\uc744 \ub0b4\ub9ac\uc790\uba74, \ube44\uc8fc\uae30 \uc5f0\uc18d\ud568\uc218\ub77c\uace0 \ud558\uc5ec \uadf8 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc774 \ubb34\uc870\uac74 \uc5f0\uc18d\ud568\uc218\uc778 \uac83\uc740 \uc544\ub2c8\ub77c\ub294 \uac83\uc774\ub2e4.<\/p>\n

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

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