منابع مشابه
Physiological Positive Feedback Mechanisms
In positive feedback mechanisms, the response to a stimulus does not stop or reverse it but instead keeps the sequence of events going up. At first glance, this would appear to be a counter to the principle of homeostasis, since a positive feedback loop has no obvious means of stopping. Not surprisingly, therefore, the positive feedback is less common in nature than the negative one. A positive...
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Tissue factor (TF), the initiator of coagulation, continuously circulates in the plasma, and the clotting system “idles,” generating very low levels of active clotting enzymes, clotting products, and by-products. Given the enormous amplification potential of the clotting cascade, rigorous control is required to ensure that such low-level stimulation does not cause massive system amplification a...
متن کاملPositive feedback
Positive feedback is a process that occurs in a feedback loop in which the effects of a small disturbance on a system include an increase in the magnitude of the perturbation.[1] That is, A produces more of B which in turn produces more of A.[2] In contrast, a system in which the results of a change act to reduce or counteract it has negative feedback.[1][3] Mathematically, positive feedback is...
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The topic may be approached by defining the concept of anaesthesia, a term introduced by Oliver Wendell Holmes for defining the elimination of surgical pain, characterised by immobility, eliminating pain, amnesia and lack of consciousness, effects provoked by using anaesthetic agents reversibly affecting different areas of the central nervous system (CNS). These conditions were successfully met...
متن کاملFeedback and positive feedback stabilizability and holdability
Consider the following problem. Given a discrete-time linear system, find, if possible, linear state-feedback control laws such that under these laws all trajectories originating in the non-negative orthant of the state space remain non-negative while asymptotically deteriorating to the origin. This problem is called feedback stabilizability-holdability problem (FSH). If, in addition, the requi...
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ژورنال
عنوان ژورنال: American Journal of Biomedical Sciences
سال: 2011
ISSN: 1937-9080
DOI: 10.5099/aj110200145