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Now showing items 171-177 of 177
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Christiansen Grammar for Some P Systems
(Fénix Editora, 2005)
The main goal of this work is to formally describe P systems. This is a necessary step to subsequently apply Christiansen grammar evolution (an evolutionary tool developed by the authors) for automatic designing of P ...
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Structured Modeling with Hyperdag P Systems: Part A
(Fénix Editora, 2009)
P systems provide a computational model based on the structure and interaction of living cells. A P system consists of a hierarchical nesting of cell-like membranes, which can be visualized as a rooted tree. Although ...
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Covering Rules in P Systems: Some Preliminary Ideas
(Fénix Editora, 2004)
In this paper we propose a new kind of rules inside the regions of a P system. We have called them covering rules due to the fact that, if selected, they can manage all the objects of the region in an exhaustive manner ...
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Cell Communication in Tissue P Systems and Cell Division in Population P Systems
(Fénix Editora, 2004)
Two classes of tissue P systems based on evolution communication rules are introduced, some results are proved, but many more are listed as further research problems. A framework to develop population P systems is de¯ned ...
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Time-Driven Computations in P Systems
(Fénix Editora, 2006)
It is a well-known fact that the time of execution of a (biochemical) reaction depends on many factors, and, in particular, on the current situation of the whole system. With this motivation in mind, we propose a model ...
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Simulating Avascular Tumors with Membrane Systems
(Fénix Editora, 2005)
Tumor growth has received a considerable attention by the scientific community. In the earliest stages of development, tumor growth seems to be regulated by direct diffusion of nutrients and wastes from and to surrounding ...
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Ordinary Membrane Machines versus Other Mathematical Models of Systems Realizing Massively Parallel Computations
(Fénix Editora, 2008)
A comparison of ordinary membrane machines, understood as certain recursive families of deterministic P systems, with some other mathematical models of systems realizing massively parallel computations is discussed. These ...