Membrane computing with external output
Fundamenta Informaticae
Journal of Computer and System Sciences
P systems with active membranes: attacking NP-complete problems
Journal of Automata, Languages and Combinatorics
Handbook of Formal Languages
Membrane Computing: An Introduction
Membrane Computing: An Introduction
Computing with Membranes: Attacking NP-Complete Problems
UMC '00 Proceedings of the Second International Conference on Unconventional Models of Computation
Two Normal Forms for Rewriting P Systems
MCU '01 Proceedings of the Third International Conference on Machines, Computations, and Universality
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We propose P systems in which the solutions of previously executed computations can be stored in sub-systems composed by a number of membranes which act as memory elements. When a new input is inserted into the system, the computation on that input is started in parallel with the search for the corresponding solution in all memory membranes. If the solution is found in memory, then a copy of it is expelled from that memory membrane; the search in all other memory membranes is stopped, and the same is done with the computing sub-system. If no solution for that input is found, then the computation produces the solution, which is subsequently stored in a memory cell.