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Presentation

P Systems with Active Membranes and Two Polarizations
(Fénix Editora, 2004)
P systems with active membranes using only two electrical charges and only rules of types (a) and (c) assigned to at most two membranes are shown to be computationally complete { thus improving the previous result of ...
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P Systems with Tables of Rules
(Fénix Editora, 2004)
In the last time, several e®orts were made in order to remove the polarization of membranes from P systems with active membranes; the present paper is a contribution in this respect. In order to compensate the loss of ...
Presentation

Small Universal Spiking Neural P Systems
(Fénix Editora, 2006)
In search for small universal computing devices of various types, we consider here the case of spiking neural P systems (SN P systems), in two versions: as devices computing functions and as devices generating sets of ...
Presentation

Event-Related Outputs of Computations in P Systems
(Fénix Editora, 2005)
We briefly investigate the idea to consider as the result of a computation in a P system the number of steps elapsed between two events produced during the computation. Specifically, we first consider the case when the ...
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Presentation

Matrix Languages, Register Machines, Vector Addition Systems
(Fénix Editora, 2005)
We give a direct and simple proof of the equality of Parikh images of lan- guages generated by matrix grammars with appearance checking with the sets of vectors generated by register machines. As a particular case, we ...
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Presentation

Spiking Neural P Systems with Several Types of Spikes
(Fénix Editora, 2011)
With a motivation related to gene expression, where enzymes act in series, somewhat similar to the train spikes traveling along the axons of neurons, we consider an extension of spiking neural P systems, where several ...