BCSSS

International Encyclopedia of Systems and Cybernetics

2nd Edition, as published by Charles François 2004 Presented by the Bertalanffy Center for the Study of Systems Science Vienna for public access.

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The International Encyclopedia of Systems and Cybernetics was first edited and published by the system scientist Charles François in 1997. The online version that is provided here was based on the 2nd edition in 2004. It was uploaded and gifted to the center by ASC president Michael Lissack in 2019; the BCSSS purchased the rights for the re-publication of this volume in 200?. In 2018, the original editor expressed his wish to pass on the stewardship over the maintenance and further development of the encyclopedia to the Bertalanffy Center. In the future, the BCSSS seeks to further develop the encyclopedia by open collaboration within the systems sciences. Until the center has found and been able to implement an adequate technical solution for this, the static website is made accessible for the benefit of public scholarship and education.

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PETRI NETWORKS 1)2)

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"An oriented graph used to describe the behavior of asynchronic sequential automata" (A. LEROY AND J.P. SIGNORET, 1992, p.49)

PETRI networks were introduced by Dr. PETRI in Germany in 1962. They are still in a stage of further development.

A PETRI network is made of "places"or "positions"which represent the static part of the network.

Tokens are moved from places to places in accordance with some transition rules which must be specified. Thus the network evolves from state to state by successive steps. During its evolution the PETRI network covers progressively all the possible states of the system under study.

It combines a structural representation of the modelized automata and its possibilities of transformations, based on the transitions rules. These can be deterministic with specified delays, or random ones, representing in such cases phenomena whose occurrence cannot be precisely forecasted.

The authors explain as follows the possible uses of PETRI nets, which sequentially follow the different successive states of the modelized system:

- analyse in a detailed way its sequential behavior

- identify the different states in view of creating a markovian graph of states

- identify the non-accessible states

- find the lock-ins, delays, feedbacks, etc

- discover bifurcations or different possible transitions (Ibid, p. 54)

PETRI networks can be used to modelize projected physical or mechanical systems and discover potential failures, risks or incompatibilities. (Adapted from A. LEROY and J.P. SIGNORET, 1992)

Categories

  • 1) General information
  • 2) Methodology or model
  • 3) Epistemology, ontology and semantics
  • 4) Human sciences
  • 5) Discipline oriented

Publisher

Bertalanffy Center for the Study of Systems Science(2020).

To cite this page, please use the following information:

Bertalanffy Center for the Study of Systems Science (2020). Title of the entry. In Charles François (Ed.), International Encyclopedia of Systems and Cybernetics (2). Retrieved from www.systemspedia.org/[full/url]

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