Ãâó : http://s-space.snu.ac.kr/bitstream/10371/82645/1/%ec%a0%84%ec%82%b0%ec%9c%a0%ec%b2%b4_%ed%95%b4%ec%84%9d_%eb%b0%8f_%ec%84%a4%ea%b3%84%eb%a5%bc_%ec%9c%84%ed%95%9c_%ec%9b%b9%ea%b8%b0%eb%b0%98_%ec%9b%8c%ed%81%ac%ed%94%8c%eb%a1%9c%ec%9a%b0_%ed%99%98%ea%b2%bd.pdf