Assuming the rate of immigration is the same as emigration, population size increases when births exceed deaths. As population size increases, population density increases, and the supply of limited available resources per organism decreases. There...

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A logistic function or logistic curve models the S-curve of growth of some set P. The initial stage of growth is approximately exponential; then, as saturation begins, the growth slows, and at maturity, growth stops. As shown below, the untrammeled...

Increasingly, organizations are recognizing the importance of integrating their marketing and logistics activities. According to recent trade publications, "whatever the definition, warehousing and distribution are critical to the successful marketing of products: if the product is not where customers want it, when they want...

Yijian Huang is Assistant Member (E-mail: eugene@fhcrc.org) and C. Y. Wang is Associate Member (E-mail: cywang@fhcrc.org), Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98109. This research was partially supported by the National Institutes of Health funds A129168, AG15026, and...