{"id":25255,"date":"2024-10-26T09:53:21","date_gmt":"2024-10-26T09:53:21","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=25255"},"modified":"2024-11-26T08:02:23","modified_gmt":"2024-11-26T08:02:23","slug":"%eb%94%a5-%eb%9f%ac%eb%8b%9d%ec%9d%84-%ec%9d%b4%ec%9a%a9%ed%95%9c-%ec%9e%90%ec%97%b0%ec%96%b4-%ec%b2%98%eb%a6%ac-%ec%97%ad%ec%a0%84%ed%8c%8cbackpropagation-%ec%9d%b4%ed%95%b4%ed%95%98%ea%b8%b0","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/25255\/","title":{"rendered":"\ub525 \ub7ec\ub2dd\uc744 \uc774\uc6a9\ud55c \uc790\uc5f0\uc5b4 \ucc98\ub9ac, \uc5ed\uc804\ud30c(BackPropagation) \uc774\ud574\ud558\uae30"},"content":{"rendered":"<p>\uc790\uc5f0\uc5b4 \ucc98\ub9ac(Natural Language Processing, NLP)\ub294 \uc778\uac04\uc758 \uc5b8\uc5b4\ub97c \uc774\ud574\ud558\uace0 \ucc98\ub9ac\ud558\ub294 \ucef4\ud4e8\ud130 \uacfc\ud559\uc758 \ud55c \ubd84\uc57c\uc785\ub2c8\ub2e4. \ucd5c\uadfc \uba87 \ub144 \uac04 \ub525 \ub7ec\ub2dd \uae30\uc220\uc758 \ubc1c\uc804\uc73c\ub85c \uc790\uc5f0\uc5b4 \ucc98\ub9ac \ubd84\uc57c\ub294 \ub208\ubd80\uc2e0 \uc131\uacfc\ub97c \uac70\ub450\uc5c8\uc2b5\ub2c8\ub2e4. \ubcf8 \uae00\uc5d0\uc11c\ub294 \ub525 \ub7ec\ub2dd\uc744 \uc774\uc6a9\ud55c \uc790\uc5f0\uc5b4 \ucc98\ub9ac\ub97c \uc704\ud55c \uae30\ubcf8 \uac1c\ub150\uacfc \ud568\uaed8, \uc5ed\uc804\ud30c(backpropagation) \uc54c\uace0\ub9ac\uc998\uc758 \uc6d0\ub9ac\uc640 \uadf8 \uc911\uc694\uc131\uc744 \ub2e4\ub8f0 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<h2>1. \uc790\uc5f0\uc5b4 \ucc98\ub9ac\uc758 \ud544\uc694\uc131\uacfc \uc751\uc6a9<\/h2>\n<p>\uc790\uc5f0\uc5b4 \ucc98\ub9ac\ub294 \ucef4\ud4e8\ud130\uac00 \uc778\uac04 \uc5b8\uc5b4\ub97c \uc774\ud574\ud558\uace0 \ud574\uc11d\ud558\uba70 \uc0dd\uc131\ud558\ub294 \uac83\uc744 \ubaa9\ud45c\ub85c \ud569\ub2c8\ub2e4. \uc774\ub294 \ub2e4\uc591\ud55c \uc751\uc6a9 \ud504\ub85c\uadf8\ub7a8\uc5d0\uc11c \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \ub2e4\uc74c\uacfc \uac19\uc740 \ubd84\uc57c\uc5d0\uc11c \ud65c\uc6a9\ub429\ub2c8\ub2e4:<\/p>\n<ul>\n<li><strong>\uae30\uacc4 \ubc88\uc5ed:<\/strong> \ub2e4\uc591\ud55c \uc5b8\uc5b4 \uac04\uc758 \ud14d\uc2a4\ud2b8 \ubcc0\ud658.<\/li>\n<li><strong>\uac10\uc131 \ubd84\uc11d:<\/strong> \ud14d\uc2a4\ud2b8 \ub0b4 \uac10\uc815\uc744 \ud30c\uc545\ud558\uace0 \ubd84\uc11d\ud558\uae30.<\/li>\n<li><strong>\ucc57\ubd07:<\/strong> \uc0ac\uc6a9\uc790\uc640\uc758 \ub300\ud654\ub97c \ud1b5\ud55c \uc790\ub3d9 \uc751\ub2f5 \uc0dd\uc131.<\/li>\n<li><strong>\uc815\ubcf4 \uac80\uc0c9:<\/strong> \uc0ac\uc6a9\uc790 \uc9c8\ubb38\uc5d0 \ub300\ud55c \uc801\uc808\ud55c \uc815\ubcf4 \uc81c\uacf5.<\/li>\n<\/ul>\n<h2>2. \ub525 \ub7ec\ub2dd\uc758 \uae30\ucd08<\/h2>\n<p>\ub525 \ub7ec\ub2dd\uc740 \uc778\uacf5 \uc2e0\uacbd\ub9dd(Artificial Neural Network, ANN) \uad6c\uc870\ub97c \uc774\uc6a9\ud558\uc5ec \ub370\uc774\ud130\ub97c \ucc98\ub9ac\ud558\uace0 \ud559\uc2b5\ud558\ub294 \ubc29\ubc95\ub860\uc785\ub2c8\ub2e4. \ub2e4\uce35 \ud37c\uc149\ud2b8\ub860(Multi-layer Perceptron, MLP) \uad6c\uc870\ub97c \ud3ec\ud568\ud55c \ub2e4\uc591\ud55c \uc2e0\uacbd\ub9dd \uc544\ud0a4\ud14d\ucc98\uac00 \uc874\uc7ac\ud558\uba70, \uc774\ub4e4\uc740 \ubcf5\uc7a1\ud55c \ube44\uc120\ud615 \uad00\uacc4\ub97c \ubaa8\ub378\ub9c1\ud558\ub294 \ub370 \ud6a8\uacfc\uc801\uc785\ub2c8\ub2e4.<\/p>\n<h3>2.1 \uc778\uacf5 \uc2e0\uacbd\ub9dd\uc758 \uad6c\uc870<\/h3>\n<p>\uc2e0\uacbd\ub9dd\uc740 \uc785\ub825\uce35(input layer), \uc740\ub2c9\uce35(hidden layer), \ucd9c\ub825\uce35(output layer)\uc73c\ub85c \uad6c\uc131\ub429\ub2c8\ub2e4. \uac01 \uce35\uc740 \uc5ec\ub7ec \uac1c\uc758 \ub274\ub7f0(neuron)\uc73c\ub85c \uc774\ub8e8\uc5b4\uc838 \uc788\uc73c\uba70, \uc774\ub4e4 \uac04\uc758 \uc5f0\uacb0\uc740 \uac00\uc911\uce58(weights)\ub97c \ud1b5\ud574 \uc870\uc815\ub429\ub2c8\ub2e4.<\/p>\n<h3>2.2 \ud65c\uc131\ud654 \ud568\uc218<\/h3>\n<p>\ub274\ub7f0\uc5d0\uc11c \ud65c\uc131\ud654 \ud568\uc218\ub294 \uc785\ub825 \uc2e0\ud638\ub97c \ubcc0\ud658\ud558\uc5ec \ub2e4\uc74c \ub274\ub7f0\uc73c\ub85c \uc804\ub2ec\ud558\ub294 \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4. \uc77c\ubc18\uc801\uc73c\ub85c \uc0ac\uc6a9\ub418\ub294 \ud65c\uc131\ud654 \ud568\uc218\uc5d0\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uac83\ub4e4\uc774 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<ul>\n<li><strong>\uc2dc\uadf8\ubaa8\uc774\ub4dc \ud568\uc218:<\/strong> <code>f(x) = 1 \/ (1 + exp(-x))<\/code><\/li>\n<li><strong>\ud558\uc774\ud37c\ubcfc\ub9ad \ud0c4\uc820\ud2b8 \ud568\uc218:<\/strong> <code>f(x) = (exp(x) - exp(-x)) \/ (exp(x) + exp(-x))<\/code><\/li>\n<li><strong>ReLU(Rectified Linear Unit):<\/strong> <code>f(x) = max(0, x)<\/code><\/li>\n<\/ul>\n<h2>3. \uc790\uc5f0\uc5b4 \ucc98\ub9ac\uc5d0\uc11c \ub525 \ub7ec\ub2dd\uc758 \uc801\uc6a9<\/h2>\n<p>\ub525 \ub7ec\ub2dd\uc740 \uc790\uc5f0\uc5b4 \ucc98\ub9ac\uc5d0\uc11c \ub2e4\uc591\ud55c \ubc29\uc2dd\uc73c\ub85c \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \uc8fc\uc694 \uc751\uc6a9 \uc0ac\ub840\uc785\ub2c8\ub2e4:<\/p>\n<h3>3.1 \ub2e8\uc5b4 \uc784\ubca0\ub529<\/h3>\n<p>\ub2e8\uc5b4 \uc784\ubca0\ub529(word embedding)\uc740 \ub2e8\uc5b4\ub97c \ubca1\ud130 \ud615\ud0dc\ub85c \ud45c\ud604\ud558\uc5ec \ucef4\ud4e8\ud130\uac00 \uc774\ud574\ud560 \uc218 \uc788\ub294 \ud615\ud0dc\ub85c \ubcc0\ud658\ud558\ub294 \ubc29\ubc95\uc785\ub2c8\ub2e4. \ub300\ud45c\uc801\uc778 \ub2e8\uc5b4 \uc784\ubca0\ub529 \uae30\ubc95\uc73c\ub85c\ub294 Word2Vec, GloVe\uac00 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>3.2 \uc21c\ud658 \uc2e0\uacbd\ub9dd(RNN)<\/h3>\n<p>\uc21c\ud658 \uc2e0\uacbd\ub9dd(RNN)\uc740 \uc2dc\ud000\uc2a4 \ub370\uc774\ud130\ub97c \ucc98\ub9ac\ud558\ub294 \ub370 \ud6a8\uacfc\uc801\uc778 \uc2e0\uacbd\ub9dd \uad6c\uc870\uc785\ub2c8\ub2e4. \ud2b9\ud788 \uc2dc\uac04 \uc758\uc874\uc131\uc774 \uc911\uc694\ud55c \uc790\uc5f0\uc5b4 \ucc98\ub9ac\uc5d0 \uc801\ud569\ud569\ub2c8\ub2e4. RNN\uc740 \uacfc\uac70\uc758 \uc815\ubcf4\ub97c \uae30\uc5b5\ud558\uace0 \ub2e4\uc74c \ub2e8\uc5b4\ub97c \uc608\uce21\ud558\ub294 \ub370 \uc720\uc6a9\ud569\ub2c8\ub2e4.<\/p>\n<h3>3.3 \ubcc0\ud658\uae30(Transformer) \ubaa8\ub378<\/h3>\n<p>Transformer\ub294 \ud604\uc7ac \uc790\uc5f0\uc5b4 \ucc98\ub9ac \ubd84\uc57c\uc5d0\uc11c \uac00\uc7a5 \ub9ce\uc774 \uc0ac\uc6a9\ub418\ub294 \uc544\ud0a4\ud14d\ucc98\uc785\ub2c8\ub2e4. Self-Attention \uba54\ucee4\ub2c8\uc998\uc744 \ud1b5\ud574 \uc785\ub825 \ub370\uc774\ud130\uc758 \uac01 \uc694\uc18c \uac04\uc758 \uad00\uacc4\ub97c \ub3d9\uc801\uc73c\ub85c \ud3c9\uac00\ud558\uc5ec \ub192\uc740 \uc131\ub2a5\uc744 \ubc1c\ud718\ud569\ub2c8\ub2e4.<\/p>\n<h2>4. \uc5ed\uc804\ud30c(BackPropagation) \uc54c\uace0\ub9ac\uc998 \uac1c\uc694<\/h2>\n<p>\uc5ed\uc804\ud30c\ub294 \ub525 \ub7ec\ub2dd \ubaa8\ub378\uc758 \ud30c\ub77c\ubbf8\ud130\ub97c \ucd5c\uc801\ud654\ud558\uae30 \uc704\ud574 \uc0ac\uc6a9\ub418\ub294 \uc54c\uace0\ub9ac\uc998\uc785\ub2c8\ub2e4. \uc190\uc2e4 \ud568\uc218(loss function)\ub97c \ucd5c\uc18c\ud654\ud558\uae30 \uc704\ud574 \uac00\uc911\uce58\uc640 \ud3b8\ud5a5\uc744 \uc5c5\ub370\uc774\ud2b8\ud569\ub2c8\ub2e4. \uc5ed\uc804\ud30c\ub294 \uc8fc\ub85c \ub2e4\uc74c \ub450 \ub2e8\uacc4\ub85c \uad6c\uc131\ub429\ub2c8\ub2e4:<\/p>\n<h3>4.1 \uc21c\uc804\ud30c(Forward Propagation)<\/h3>\n<p>\uc785\ub825 \ub370\uc774\ud130\uac00 \uac01 \ub274\ub7f0\uc744 \ud1b5\ud574 \uc9c4\ud589\ub418\uc5b4 \ucd9c\ub825\uc774 \uc0dd\uc131\ub418\ub294 \ub2e8\uacc4\uc785\ub2c8\ub2e4. \uac01 \uce35\uc758 \ub274\ub7f0\uc740 \uc785\ub825 \uc2e0\ud638\uc5d0 \uac00\uc911\uce58\ub97c \uacf1\ud55c \ud6c4 \ud65c\uc131\ud654 \ud568\uc218\ub97c \uc801\uc6a9\ud558\uc5ec \ub2e4\uc74c \uce35\uc73c\ub85c \uc2e0\ud638\ub97c \uc804\ub2ec\ud569\ub2c8\ub2e4.<\/p>\n<h3>4.2 \uc5ed\uc804\ud30c(Backward Propagation)<\/h3>\n<p>\ubaa8\ub378\uc758 \uc608\uce21 \uacb0\uacfc\uc640 \uc2e4\uc81c \uac12 \uac04\uc758 \ucc28\uc774\ub97c \uacc4\uc0b0\ud558\uc5ec, \uadf8 \uc624\ucc28\ub97c \uac01 \uac00\uc911\uce58\uc5d0 \ub300\ud574 \uac70\uafb8\ub85c \uc804\ud30c\ud558\uc5ec \uc5c5\ub370\uc774\ud2b8\ud558\ub294 \ub2e8\uacc4\uc785\ub2c8\ub2e4. \uc774 \uacfc\uc815\uc740 \uccb4\uc778 \ub8f0(chain rule)\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc218\ud589\ub429\ub2c8\ub2e4.<\/p>\n<h2>5. \uc5ed\uc804\ud30c \uc54c\uace0\ub9ac\uc998\uc758 \uc218\ud559\uc801 \uc6d0\ub9ac<\/h2>\n<p>\uc5ed\uc804\ud30c \uc54c\uace0\ub9ac\uc998\uc758 \uae30\ucd08\ub294 \ubbf8\ubd84\uc744 \ud1b5\ud574 \uc190\uc2e4 \ud568\uc218\uc758 \uae30\uc6b8\uae30\ub97c \uacc4\uc0b0\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uc774 \uae30\uc6b8\uae30\ub97c \uc0ac\uc6a9\ud558\uc5ec \uac00\uc911\uce58\ub97c \uc5c5\ub370\uc774\ud2b8\ud558\uac8c \ub429\ub2c8\ub2e4.<\/p>\n<h3>5.1 \uc190\uc2e4 \ud568\uc218<\/h3>\n<p>\uc190\uc2e4 \ud568\uc218\ub294 \ubaa8\ub378\uc758 \uc131\ub2a5\uc744 \ud3c9\uac00\ud558\ub294 \uc9c0\ud45c\ub85c \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \uc77c\ubc18\uc801\uc778 \uc190\uc2e4 \ud568\uc218\ub85c\ub294 \ud3c9\uade0 \uc81c\uacf1 \uc624\ucc28(MSE)\uc640 \ud06c\ub85c\uc2a4 \uc5d4\ud2b8\ub85c\ud53c \uc190\uc2e4(cross-entropy loss)\uac00 \uc788\uc2b5\ub2c8\ub2e4. \uc190\uc2e4 \ud568\uc218\ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<pre><code>loss = (1\/N) * \u03a3(y_i - \u0177_i)^2<\/code><\/pre>\n<h3>5.2 \uae30\uc6b8\uae30 \uacc4\uc0b0<\/h3>\n<p>\uc190\uc2e4 \ud568\uc218\uc5d0 \ub300\ud55c \uac01 \uac00\uc911\uce58\uc758 \uae30\uc6b8\uae30\ub294 \ud30c\ub77c\ubbf8\ud130\uac00 \uc190\uc2e4 \ud568\uc218\uc5d0 \ubbf8\uce58\ub294 \uc601\ud5a5\uc744 \uce21\uc815\ud569\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \uac00\uc911\uce58\ub97c \uc5b4\ub5bb\uac8c \uc870\uc815\ud574\uc57c \ud560\uc9c0\ub97c \uacb0\uc815\ud569\ub2c8\ub2e4. \uae30\uc6b8\uae30\ub294 \uccb4\uc778 \ub8f0\uc744 \ud1b5\ud574 \uad6c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<pre><code>\u2202L\/\u2202w = \u2202L\/\u2202\u0177 * \u2202\u0177\/\u2202z * \u2202z\/\u2202w<\/code><\/pre>\n<p>\uc5ec\uae30\uc11c L\uc740 \uc190\uc2e4 \ud568\uc218, w\ub294 \uac00\uc911\uce58, z\ub294 \ub274\ub7f0\uc758 \ucd1d \uc785\ub825\uac12\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/p>\n<h3>5.3 \uac00\uc911\uce58 \uc5c5\ub370\uc774\ud2b8<\/h3>\n<p>\uae30\uc6b8\uae30 \uc815\ubcf4\ub294 \uc635\ud2f0\ub9c8\uc774\uc800(optimizer)\ub97c \ud1b5\ud574 \uac00\uc911\uce58\ub97c \uc5c5\ub370\uc774\ud2b8\ud558\ub294 \ub370 \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \uac00\uc7a5 \uc77c\ubc18\uc801\uc73c\ub85c \uc0ac\uc6a9\ub418\ub294 \uc635\ud2f0\ub9c8\uc774\uc800\ub294 \uacbd\uc0ac \ud558\uac15\ubc95(Gradient Descent)\uc785\ub2c8\ub2e4. \uc5c5\ub370\uc774\ud2b8 \uacf5\uc2dd\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n<pre><code>w = w - \u03b7 * \u2202L\/\u2202w<\/code><\/pre>\n<p>\uc5ec\uae30\uc11c \u03b7\ub294 \ud559\uc2b5\ub960(learning rate)\uc785\ub2c8\ub2e4.<\/p>\n<h2>6. \uc5ed\uc804\ud30c \uc54c\uace0\ub9ac\uc998\uc758 \uc7a5\ub2e8\uc810<\/h2>\n<p>\uc5ed\uc804\ud30c \uc54c\uace0\ub9ac\uc998\uc740 \ub2e4\uc591\ud55c \uce21\uba74\uc5d0\uc11c \uc7a5\uc810\uacfc \ub2e8\uc810\uc744 \uac00\uc9c0\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>6.1 \uc7a5\uc810<\/h3>\n<ul>\n<li><strong>\ud6a8\uc728\uc131:<\/strong> \ub300\uaddc\ubaa8 \ub124\ud2b8\uc6cc\ud06c\uc5d0\uc11c\ub3c4 \ube60\ub974\uac8c \ud559\uc2b5\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>\uc77c\ubc18\uc131:<\/strong> \ub2e4\uc591\ud55c \ub124\ud2b8\uc6cc\ud06c \uc544\ud0a4\ud14d\ucc98\uc5d0\uc11c \uc801\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h3>6.2 \ub2e8\uc810<\/h3>\n<ul>\n<li><strong>\uad6d\ubd80 \ucd5c\uc19f\uac12:<\/strong> \ube44\uc120\ud615 \ucd5c\uc801\ud654 \ubb38\uc81c\ub85c \uc778\ud574 \uc9c0\uc5ed \ucd5c\uc19f\uac12\uc5d0 \ube60\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>\uacfc\uc801\ud569:<\/strong> \ub370\uc774\ud130\uc5d0 \uc9c0\ub098\uce58\uac8c \ub9de\ucdb0\uc9c0\ub294 \uacbd\ud5a5\uc774 \uc788\uc5b4 \uc77c\ubc18\ud654 \uc131\ub2a5\uc774 \ub5a8\uc5b4\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h2>7. \uacb0\ub860<\/h2>\n<p>\ub525 \ub7ec\ub2dd\uc744 \uc774\uc6a9\ud55c \uc790\uc5f0\uc5b4 \ucc98\ub9ac\ub294 \ud604\uc7ac \ub2e4\uc591\ud55c \ubd84\uc57c\uc5d0\uc11c \ud65c\uc6a9\ub418\uace0 \uc788\uc73c\uba70, \uadf8 \uc911\uc2ec\uc5d0\ub294 \uc5ed\uc804\ud30c \uc54c\uace0\ub9ac\uc998\uc774 \uc788\ub294 \uac83\uc785\ub2c8\ub2e4. \ubcf8 \uae00\uc5d0\uc11c\ub294 \uc790\uc5f0\uc5b4 \ucc98\ub9ac\uc5d0 \ub300\ud55c \uae30\ucd08\uc801\uc778 \uc774\ud574\ub97c \ubc14\ud0d5\uc73c\ub85c, \uc5ed\uc804\ud30c\uc758 \uc6d0\ub9ac\uc640 \uc218\ud559\uc801 \uae30\ucd08\ub97c \ub2e4\ub8e8\uc5c8\uc2b5\ub2c8\ub2e4. \uc774 \uacfc\uc815\uc744 \ud1b5\ud574 \ub525 \ub7ec\ub2dd\uc758 \uc791\ub3d9 \ubc29\uc2dd\uc744 \uc774\ud574\ud558\uace0, \uc790\uc5f0\uc5b4 \ucc98\ub9ac \ubd84\uc57c\uc5d0\uc11c\uc758 \uc751\uc6a9 \uac00\ub2a5\uc131\uc744 \ud0d0\uad6c\ud558\ub294 \ub370 \ub3c4\uc6c0\uc774 \ub418\uc5c8\uae38 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n<p>\uacc4\uc18d\ud574\uc11c \ub2e4\uc591\ud55c \uae30\ubc95\uacfc \uc751\uc6a9 \uc0ac\ub840\ub97c \uc2ec\ud654\ud559\uc2b5\ud558\uba70, \ubcf5\uc7a1\ud55c \uc790\uc5f0\uc5b4 \ucc98\ub9ac \ubb38\uc81c\ub97c \ud574\uacb0\ud560 \uc218 \uc788\ub294 \ub2a5\ub825\uc744 \ud0a4\uc6b0\ub294 \uac83\uc774 \uc911\uc694\ud569\ub2c8\ub2e4. \uc774\uc81c\ub294 \uc5ec\ub7ec\ubd84\uc774 \uc5ed\uc804\ud30c 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