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    STUDIA INFORMATICA - Issue no. 1 / 2001  
         
  Article:   AN EFFICIENT WAY TO MODEL P SYSTEMS BY X-MACHINE SYSTEMS.

Authors:  HORIA GEORGESCU.
 
       
         
  Abstract:  Starting from the powerful concept of stream X-machine, the author proposed in some previous papers an original way to integrate more stream X-machines with ε-transitions into a system. The communication be- tween the components is assured by means of a communication matrix, used as a common memory. It was proved that by introducing an additional com- ponent, it is possible to achieve communication in a structured way, namely by channels, with select constructs appearing in each communicating state. This model was used for proving that P systems may be modelled by com- municating stream X-machine systems. Even if the proof is a constructive one, it is not satisfactory due to its low level of concurrency. In this paper a much more efficient construction, from the concurrency''s point of view, is presented.  
         
     
         
         
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