Part of the Lecture Notes in Computer Science book series LNCS, volume Abstract Model checking is emerging as a practical tool for automated debugging of complex reactive systems such as embedded controllers and network protocols see [ 23 ] for a survey. Traditional techniques for model checking do not admit an explicit modeling of time, and are thus, unsuitable for analysis of real-time systems whose correctness depends on relative magnitudes of different delays. Consequently, timed automata [ 7 ] were introduced as a formal notation to model the behavior of real-time systems. Its definition provides a simple way to annotate state-transition graphs with timing constraints using finitely many real-valued clock variables. Automated analysis of timed automata relies on the construction of a finite quotient of the infinite space of clock valuations.

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Our definition provides a simple, and yet powerful, way to annotate state-transition graphs with timing constraints using finitely many real-valued clocks. A timed automaton accepts timed words — strings in which a real-valued time of occurrence is associated with each symbol.

We study timed automata from the perspective of formal language theory: we consider closure properties, decision problems, and subclasses. We discuss the application of this theory to automatic verification of real-time requirements of finite-state systems. This is a preview of subscription content, log in to check access. Preview Unable to display preview. Download preview PDF. Model-checking for real-time systems. Model-checking for probabilistic real-time systems. The benefits of relaxing punctuality.

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The theory of timed automata



A Theory of Timed Automata



Timed Automata


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