@article {, title = {Looking for Simple Common Schemes to Design Recognizer P Systems with Active Membranes That Solve Numerical Decision Problems }, journal = {Lecture Notes in Computer Science}, volume = {3699}, year = {2005}, pages = {94-104}, publisher = {Springer}, address = {Amsterdam, The Netherlands}, abstract = {Earlier solutions to decision problems by means of P systems used many counter objects to control the synchronization of different stages in a computation (usually as many counters as the stage must last in the worst case). In this paper we propose a way to replace those counters with some spacial objects for each stage. Furthermore, following the ideas presented in [1], in order to have a common scheme to attack numerical problems, all instances of a problem with the same size are solved by the same P system (which depends on the size) given an input which describes the corresponding instance of the problem. We illustrate these ideas with a cellular solution to the Subset-Sum problem. }, isbn = {978-3-540-29100-8}, issn = {0302-9743}, doi = {10.1007/11560319}, url = {http://www.springerlink.com/index/2b5lh8xcefwqkp4w.pdf}, author = {Carmen Graciani-D{\'\i}az and Agust{\'\i}n Riscos-N{\'u}{\~n}ez} }