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Download Coloured Petri Nets: Modelling and Validation of Concurrent by Kurt Jensen, Lars M. Kristensen PDF

By Kurt Jensen, Lars M. Kristensen

Coloured Petri Nets (CPN) is a graphical language for modelling and validating concurrent and disbursed structures, and different platforms during which concurrency performs an immense position. the improvement of such structures is very not easy due to inherent intricacies like attainable nondeterminism and the enormous variety of attainable execution sequences.

In this textbook Jensen and Kristensen introduce the constructs of the CPN modelling language and current the comparable research tools intimately. additionally they offer a accomplished highway map for the sensible use of CPN through showcasing chosen commercial case stories that illustrate the sensible use of CPN modelling and validation for layout, specification, simulation, verification and implementation in numerous program domains.

Their presentation basically goals at readers drawn to the sensible use of CPN. hence all thoughts and constructs are first informally brought via examples after which via formal definitions (which should be skipped). The e-book is preferably appropriate for a one-semester direction at a sophisticated undergraduate or graduate point, and during its robust software examples may also serve for self-study. An accompanying web site deals extra fabric comparable to slides, routines and undertaking proposals.

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Extra info for Coloured Petri Nets: Modelling and Validation of Concurrent Systems

Example text

This means that there exist different occurrence sequences containing different sequences of steps and leading to different reachable markings. It is important to stress that it is only the choice between the enabled steps which is non-deterministic. The individual steps themselves are deterministic, in the sense that once an enabled step has been selected in a given marking, the marking resulting from its occurrence is uniquely determined, unless a random number function is used in one of the arc expressions.

An interactive simulation is by its nature slow, since it takes time for the user to investigate the markings and enablings and to choose between them. This means that only a few steps can be executed per minute and the working style is very similar to the single-step debugging known from conventional programming environments. When a CPN model is simulated in automatic mode, the simulator performs all of the calculations and makes all of the choices. This kind of simulation is similar to a program execution, and a speed of several thousand steps per second is typical.

Record colour sets are defined using the colour set constructor record. Record values are written using curly brackets { and } surrounding a comma-separated list. An example of a value in the colour set DATAPACK is {seq=1,data="COL"} which represents a data packet with sequence number 1 and content "COL". The order in which the record fields are specified is insignificant, which means that it is also possible to write the above value as {data="COL",seq=1}. Records may, in general, contain one or more fields.

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