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Holland's schema theorem (an inequality) may be viewed as an attempt to understand genetic search in terms of a coarse graining of the state space. Stephens and Waelbroeck developed that perspective, sharpening the schema theorem to an equality. Of particular interest is a "form invariance" of their equations; the form is unchanged by the degree of coarse(More)
A case study of an intrusion into a Linux cluster for parallel computing is presented, along with an approach used by the authors to make the system less vulnerable to future intrusions. Linux clusters have revolutionized computing by providing access to modern software technologies at low-cost. However, such clusters are vulnerable, and often managed by(More)
BACKGROUND Preeclampsia (PE) is a leading cause of maternal death. Its cause is still debated but there is general agreement that the placenta plays a central role. Perhaps the most commonly proposed contributors to PE include placental hypoxia, oxidative stress, and increased proinflammatory cytokines. How the placenta responds to these abnormalities has(More)
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