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  1. 原本最簡單的Population Model 是 P'(t)=RP.R是一個常數。但因為這個 MODEL 會...

    分類:科學及數學 > 數學 2009年05月14日

  2. ...capacity, you can take k to be an estimate of the initial relative growth rate.) use the logistic model to estimate the world population in the year 2000 & compare with the actual population of...

    分類:科學及數學 > 數學 2007年11月11日

  3. (1 + ae^bt)y = k, where a = 71.57, b = - 0.0516 and k = 895598 By Product Rule, (1 + ae^bt)(dy/dt)+ y(abe^bt) = 0 dy/dt = - y(abe^bt)/(1 + ae^bt) = - kabe^bt/(1 + ae^bt)^2 Now t = 30 so rate of change = y' = - (895598)(71.57)(- 0.0516)e^(- 0.0516 x 30)/[1 + 71.57e^(-0.0516 x 30)]^2 = 703405.83/263.12 = 2673.3. So...

    分類:科學及數學 > 數學 2011年10月15日

  4. http://i1090.photobucket.com/albums/i376/Nelson_Yu/int-2020.jpg 圖片參考:http://i1090.photobucket.com/albums/i376/Nelson_Yu/int-2020.jpg

    分類:科學及數學 > 數學 2012年06月06日

  5. ...wikipedia.org/wiki/ Logistics A supply chain, logistics network, or supply network is a coordinated.... There are a variety of supply chain models , which address both the upstream and downstream sides...

  6. ...the distance-decay concepts of the von Thunen model . Citing an example outside Hong Kong... which are favoured by the logistics services? Discuss how the growth of logistics ...