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We analyzed management policies for ecosystems subject to alternate states, thresholds, and irreversible changes. We focused on the problem of lake eutrophication by excessive phosphorus (P) input.… (More)
Mechanical ventilation is one of the most common medical therapies administered within ICUs. Similarly, the "weaning" or "liberation" of patients from mechanical ventilation is a common and extremely… (More)
everal studies have concluded that the current level of federal support for scientific research is insufficient to meet the national and international environmental challenges of the coming century.… (More)
Adapting practices that are described in the literature or used effectively in other critical care units provides an opportunity to improve the quality of critical care and reduce costs. Described in… (More)
We present both analytical and numerical results for a model where the stochastic dynamical system is not fully known. We implement an optimal control solution for the problem that incorporates… (More)
We are concerned with the management of ecological and economic systems with threshold responses and with several time scales. Although optimal control of such systems is seldom attainable, the form… (More)