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??????? ?? 8～29.5%? ??? ???? ??? ‘???’? ????? 14? ???. ???? 1? ?? ?? ?? ????? ? ???? ???? ?? ????? 7??? ??? ??? ????. ???? 500?～3000? ??? ?? 5? ???? ??? ??? ?? ????? ??.

?????? ???? “???? ?2???? ??? ????? ??? 30%? ??? ????(500? ? ??)? ????”? “???? ?? 5, 6?? ??? ???? 10%?? ??? ????”? ???.

??????? ???????(CSS)? ??? ??? ???? ?? ????? ???? ????. ??? ??? ?? ????(www.mrb.co.kr)?? ??? ? ??.

??? ?? crystal@donga.com