共查询到20条相似文献,搜索用时 15 毫秒
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A stochastic model is developed for a compartment with a single time-dependent input, and generalized to include inputs from
several sources. With the number of particles of a given molecular species in the compartment as the random variable, the
mean, variance and third central moment of this variable are calculated from its generating function, and compared with previous
results. The behavior of the calculated moments is discussed, and the possibility of applying the model to chemical and biological
systems is considered. 相似文献
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Most theoretical studies of the circulation have focussed on the transmission line properties of arteries. Only a small number
of papers have dealt with the circulation as a closed (lumped) system with two pumps connected by the lesser and greater circulation
(Beneken, inCirculatory Analog Computers, No. Holland Publ. Co., Amsterdam, 1963; Defares,et al., inCirculatory Analog Computers, No. Holland Publ. Co., Amsterdam, 1963; Grodins,Quart. Rev. of Biology,34, 93, 1959; Guyton,Cardiac Output and its Regulation, Saunders Publ. Co., New York, 1963). F. W. Cope's recent studies in this journal (Bull. Math. Biophysics,22, 19, 1960;23, 337, 1961;24, 137, 1962) deal with essentially the same questions, although here the circuit is not “closed”. We have attempted to extend
the analysis of the areflex (closed) circulation. The complete study is reported elsewhere (Defares,et al., Acta Physiol, et Parmac. Neerl., 1963). 相似文献
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Olaf Breidbach 《Theorie in den Biowissenschaften》2007,126(1):23-33
Following the concept of internal representations, signal processing in a neuronal system has to be evaluated exclusively
based on internal system characteristics. Thus, this approach omits the external observer as a control function for sensory
integration. Instead, the configuration of the system and its computational performance are the effects of endogenous factors.
Such self-referential operation is due to a strictly local computation in a network and, thereby, computations follow a set
of rules that constitute the emergent behaviour of the system. These rules can be shown to correspond to a “logic” that is
intrinsic to the system, an idea which provides the basis for neurosemantics. 相似文献
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A stochastic mammalillary model with arbitrary holding times for each of the compartments is analyzed here both with and without
input. Several results found earlier by other authors for a special case of this model are generalized and some new results
are also added. In particular the distribution of the system content is determined at a finite time and also in the steady
state. Computable bounds for the probability of exceeding a given threshold in the peripheral compartments are given. The
time until the system becomes empty is also discussed. 相似文献
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