[Pw_forum] U calculation.

[wangqiang]

hi, everyone. i read about the U calculation in Vlab's lecture. but i am not so clear. could anyone discrib it in more detail?
  Lee 
  chungnam univerisity.
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http://cnweb.search.live.com/video/results.aspx?q=%E5%8F%AF%E7%88%B1%E7%8C%AB%E5%92%AA&Form=MEVHAA
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