ֱ ϻȰ Ǵ ƴ ˷ ִ. Ϲ صǰ ִ ֱ ϻ ߴ ܰ衱 Ѵ. ֱ⸦ ܰ ϸ ܰ Ⱓ ° Ÿ ܰ Ⱓ ° ݺؼ Ÿ ͡ ǹϴ ֱ(Ѣ: cycle) ǹ̸ ġ .
ֱ ° ݺ Ÿ ǹѴ. ȸ ü α ϴ (ϻ) ܰ Ⱓ ¸ Ÿ. ̷ ܰ ֱⰣ ° 븦 ݺؼ Ÿٴ ǹ̿ ֱ(life cycle) Ѵ.
ֱ⸦ Ȯ ϸ Ⱓ (1) ܰ ǰ, (2) ܰ ߴϴ Ӽ ǰ, (3) ܰ Ⱓ 븦 ݺؼ Ÿ ̶͡ ִ(O`Land & Krecker, 1990). ֱ ܰ, ߴ, ݺ 3 Ư . ֱⰣ ߴ ܰ踦 ̸鼭 븦 ݺ Ÿ ֱ ο Ǵ 찡 ̸ Ȱֱ⡱ Ѵ. ֱ ü , ƴ ؼ ϰ ΰ Ȱֱ⸦ ϴ 찡 κ̴. ֱ ϸ (ϻ), ֱⰣ(lifespan) ְ(life course)̶ ȴ. ̶ ݺ ǹ̸ ְ ܰ質 ߴ ǹ̴ , ְ(life course)̶ ܰ質 ߴ ǹ̴ ݺ ǹ̴ ٴ 鿡 еȴ(O`land & Krecker). ֱ, (ֱⰣ) ְ йγ (ȸ) å̳ ϻȰ ǹ̷ ǰ ִ. ұϰ (ϻ, ֱⰣ)̳ ̶ְ ٴ ֱ ǹ ִ ȴ.
Ϲ ֱ еǴ Ư ִ. ֱ Ⱓ ǰ ȸ ӿ Ұ ϰ ֱ ܰ ° ݺؼ Ÿٰ . ռ 忡 ֱ Ⱓ ü , ȸ Ȳ ȭ ֱ ܰ ̴.
20 ֱ DZ ߰ Ư ΰ ¾ Ѵٴ ߴ 20 ߡĹݿ ϸ鼭 ֱ ߴܰ ܰ迡 й Ӹ ƴ϶ (ȸ) å ϻȰ ߿ ɻ簡 Ǿ. ֱ ܰ ü, ɸ ܿ ȸȭ Ư ϴ (ȸ ) Ǿ еǴ ũ. ϱ Ʒù Ⱓ, ϴ Ⱓ, ñ ֱ ũ ģٰ ִ. 8ܰ ΰ ֱ⸦ 8ܰ ְ, ܰ踶 ذϰ Ѿ ֱ ɸȸ ߴް ִٴ ִ ǥ ̷ Ǿ Դ. 8ܰ ó ñ 1950̾µ ̶ ִ ̱ ȭ ̸ ñ⿴. ̱ ȸ Ϲ ϸ ư Ȳ ֱ ݿ Ѵ.
1760(18) ̷ (1 ) 19 ް ν( 뷮 2 ̷) ϻ ũ -- Ⱓ еǰ Ǿ. ȭ ȸ ̰ ũ ȭ ɼ ´ ǰ() ַ ̷ ȴ. ȭ , , ߽ ȸ -- е ʾҰ, Ư ɰ ִ ñ() ϴ Ϲ̾Ƿ . ̱ ϰ Ĵ δ ȭ ܳ ̴.
20 ȿ ȭ ȮǾ ̴ ־ (ȸ) ȸ ȭǾ. ǻͿ ͳ ߽ ȭȸ(3 )α Ͽ. 20 Ĺݱ 鼭 ȸ Ұ õ ΰ ְ -- еǴ ϹȭǾ. ϱ غϴ Ⱓ Ǿ ݸ鿡 ϴ Ⱓ ȸ Ӱ ̶ ο ѵǴ 쵵 .
21 ۵ 4 (κ, ΰ, ڿ ̿ 뷮 ǻ, ̿ , 繰 ͳ, 3D , ڵ ) ǰ ΰ ũ ȭϰ ұϰ, ֱ ȸ -- ְ ̸ ϴ ֱ 8ܰ ū ȭ ǰ ִ.
[ּ - ()ѱּȸ ȸ/б /)ûʹ 뺹/Сȸ(IAGG) UNǥ]
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