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Verification and Control of Partially Observable Probabilistic Real-Time Systems

  • Gethin NormanEmail author
  • David Parker
  • Xueyi Zou
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9268)

Abstract

We propose automated techniques for the verification and control of probabilistic real-time systems that are only partially observable. To formally model such systems, we define an extension of probabilistic timed automata in which local states are partially visible to an observer or controller. We give a probabilistic temporal logic that can express a range of quantitative properties of these models, relating to the probability of an event’s occurrence or the expected value of a reward measure. We then propose techniques to either verify that such a property holds or to synthesise a controller for the model which makes it true. Our approach is based on an integer discretisation of the model’s dense-time behaviour and a grid-based abstraction of the uncountable belief space induced by partial observability. The latter is necessarily approximate since the underlying problem is undecidable, however we show how both lower and upper bounds on numerical results can be generated. We illustrate the effectiveness of the approach by implementing it in the PRISM model checker and applying it to several case studies, from the domains of computer security and task scheduling.

Keywords

Temporal Logic Markov Decision Process Strategy Synthesis Covert Channel Expected Reward 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.School of Computing ScienceUniversity of GlasgowGlasgowUK
  2. 2.School of Computer ScienceUniversity of BirminghamBirminghamUK
  3. 3.Department of Computer ScienceUniversity of YorkYorkUK

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