Ãâó : http://s-space.snu.ac.kr/bitstream/10371/79079/1/%ec%b0%bd%ea%b0%84%ed%98%b8_%ec%9d%b4%ec%a0%95%eb%8d%95_%ec%9d%b8%eb%a5%98%ed%95%99%ec%a0%81_%ed%8f%ac%ec%8a%a4%ed%8a%b8%eb%aa%a8%eb%8d%94%eb%8b%88%ec%a6%98%ec%97%90_%eb%8c%80%ed%95%9c_%eb%b9%84%ed%8c%90%ec%a0%81_%ea%b2%80%ed%86%a0.pdf