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The peak day length (in term of hours of daylight) occurs on 21 June, while the peak average daily
 
temperature occurs on 21 July
assuming that the relationship between daylight hours and average daily temperature can be
 
modeled by a first-order tansfer function, estimate the time constant of earth's weather system
 
(provide the units). Also, what are the units of the "process gain"?
 
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½ºÅ×Æijë Stefano   08-09-04 21:55
Áö±¸»ó ¾î´À ƯÁ¤Áö¿ªÀÇ ¸éÀûÀÌ AÀÌ°í ±×Áö¿ª °ø±âÀÇ Àüü Áú·®À» M, ºñ¿­À» C¶ó°í ÇÏ°í ¹Ù¶÷ÀÇ ¿µÇâÀº ¾øÀ¸¸ç žçÀÌ ºñÃ⶧ Áö±¸ ´ÜÀ§ Ç¥¸éÀû´ç žçÀÌ Áö±¸¿¡ °ø±ÞÇÏ´Â º¹»ç¿­À» S,  ±×Áö¿ª Áö±¸Ç¥¸é¿¡¼­ ´ÜÀ§¸éÀû´ç ¿ìÁÖ°ø°£À¸·Î º¹»ç¿­ ¥òT^4 ¸¦ ¹æÃâÇϸ鼭 Æò±Õ±â¿Â T°¡ À¯ÁöµÈ´Ù°í °¡Á¤ÇÏ¿© ¿­¼öÁö¸¦ ¸¸µé¾î Ç®¾îº¸¸é µÇÁö ¾ÊÀ»±î¿ä 

(³·½Ã°£ ±æÀÌ Áõ°¡¿¡ µû¸¥ ¿¡³ÊÁö ÃàÀû¼Óµµ, M Cp dT/dt) = {ž翡 ÀÇÇÑ ÁÖ°£°¡¿­·®, A*S* t}-  {Áö±¸ÀÇ ¾ß°£ ¹æ¿­·®, A¥òT^4*(24-t)}.....(1)

ÇÊÀÚ»ý°¢À¸·Î´Â ÀÌ ¹æÁ¤½ÄÀÇ ÇÕ¸®¼ºÀ» ¸ÕÀú °ËÁõÇØ º¸°í À̸¦ Àü´ÞÇÔ¼ö·Î ³ªÅ¸³» º¸¸é µÉ °Í °°Àºµ¥.. ½Ã°£»ó¼ö¿Í À̵浵 ±×·ÎºÎÅÍ Ã£¾Æ³»°í..  ÇѹøÇØ º¸¼¼¿ä.
   

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