139 research outputs found
Small Universal Spiking Neural P Systems
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 numbers. We start with the first
case and we produce a universal spiking neural P system with 84 neurons. If a slight
generalization of the used rules is adopted, namely, we allow rules for producing simultaneously several spikes, then a considerable improvement, to 49 neurons, is obtained.
For SN P systems used as generators of sets of numbers, we find a universal system with
restricted rules having 76 neurons, and one with extended rules having 50 neurons
Some Open Problems Collected During 7th BWMC
A few open problems and research topics collected during the 7th Brain-
storming Week on Membrane Computing are briefly presented; further details can be
found in the papers included in the volume.Junta de Andalucía P08 – TIC 0420
Some Quick Research Topics
Some research topics are suggested, in a preliminary form, in most cases
dealing with (somewhat nonstandard) extensions of existing types of P systems
Further Open Problems in Membrane Computing
A series of open problems and research topics in membrane com-
puting are pointed out, most of them suggested by recent developments in this
area. Many of these problems have several facets and branchings, and further
facets and branchings can surely be found after addressing them in a more
careful manner
Membrane computing [and graph transformation]
Introduction to membrane computing, with an eye on graph theory issues
P Systems with Anti-Matter
After a short introduction to the area of membrane computing (a branch
of natural computing), we introduce the concept of anti-matter in membrane computing.
First we consider spiking neural P systems with anti-spikes, and then we show the
power of anti-matter in cell-like P systems. As expected, the use of anti-matter objects
and especially of matter/anti-matter annihilation rules, turns out to be rather powerful:
computational completeness of P systems with anti-matter is obtained immediately, even
without using catalysts. Finally, some open problems are formulated, too
New Normal Forms for Spiking Neural P Systems
We consider a natural restriction in the architecture of a spiking neural P
system, namely, to have neurons of a small number of types (i.e., using a small number of
sets of rules), and we prove that three types of neurons are su±cient in order to generate
each recursively enumerable set of numbers as the distance between the first two spikes
emitted by the system or as the number of spikes in a specified neuron, in the halting
configuration. The case we investigate is that of spiking neural P systems with standard
rules, with delays, but without using forgetting rules; similar normal forms remain to be
found for other types of systems.Junta de Andalucía P08 – TIC 0420
On Parallel Array P Systems
We further investigate the parallel array P systems recently introduced by
K.G. Subramanian, P. Isawasan, I. Venkat, and L. Pan. We rst make explicit several
classes of parallel array P systems (with one or more axioms, with total or maximal
parallelism, with rules of various types). In this context, some results from the above
mentioned paper by Subramanian et al. are improved. A series of open problems are
formulated
Notes About Spiking Neural P Systems
Spiking neural P systems (SN P systems, for short) are much investigated
in the last years in membrane computing, but still many open problems and research
topics are open in this area. Here, we first recall two such problems (both related to
neural biology) from. One of them asks to build an SN P system able to store a
number, and to provide it to a reader without losing it, so that the number is available
for a further reading. We build here such a memory module and we discuss its extension
to model/implement more general operations, specific to (simple) data bases. Then, we
formulate another research issue, concerning pattern recognition in terms of SN P systems. In the context, we define a recent version of SN P systems, enlarged with rules able
to request spikes from the environment; based on this version, so-called SN dP systems
were recently introduced, extending to neural P systems the idea of a distributed dP
automaton. Some details about such devices are also given, as a further invitation to the
reader to this area of research.Junta de Andalucía P08 – TIC 0420
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