ȹó, 2004 ħ 뺸 ó ֿ ǥ ǥ ȹ ۼ, Ȱ Բ ؾ ϴ ̴. ȹó 2004 ħ ϰ ó 뺸ߴٰ 10 .
̿ ǼΡ 22 ó 5 ΰǼôǼ 1000 ֿ ȹ ۼ ó ؾ Ѵ.
22 ó Ǿ, ش ֿ ǥ ǥ 1,000 ȹ ϰ , ʹ 2,400 Ȯȴ.
̿ Բ غʹ ֿ 뵿ΡΡȭû߱û 4 ƴ.
űԷ 4 ֿ 30% ȿ ǥ ǥ Ͽ 5 2006 ȹ ۼ, ؾ ϸ, 70% ؼ Ϸؾ Ѵ.
ȹ ֿ 5Ⱓ ߱ ǥ ǥ ϰ, ǥ θ Ǵ ִ ǥ ǥ ǥġ ó ų ۼ, ȿ ÷ؾ ϰ, ó ꡤ ϰ ȴ.
ó ȹ õ ǥ ǥġ ġ мϿ ش , Ը ȯ(feed-back)Ŵν, 游 ϰ, ȿ ̰ ȴ.
䱸 ÿ Ǵ 2005 ȹ Ϸ 2006 ǥ ǥ θ ۼǰ 2006 ݿȴ.
δ ȹ, Ѿ (Top-down), ȸ ý۱ Բ 4 ϳ , ſԴµ, Ǹ Ȯ Բ åӼ ũ ϰ ִ. <ڷ=ȹó>
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