We solve some decision problems for timed automata which were raised by S. Tripakis in [Tri04] and by E. Asarin in [Asa04]. In particular, we show that one cannot decide whether a given timed automaton is determinizable or whether the complement of a timed regular language is timed regular. We show that the problem of the minimization of the number of clocks of a timed automaton is undecidable....

In this paper we propose a model, timed automata with non-instantaneous actions, which allows representing in a suitable way real-time systems. Timed automata with non-instantaneous actions extend the timed automata model by dropping the assumption that actions are instantaneous: in our model an action can take some time to be completed. We investigate the expressiveness of the new model, compa...

In this work we present a timed extension of the AltaRica formalism [1, 2]. Following the work of [2], we extend the semantics of AltaRica to timed components and timed nodes. Moreover we also extend the priority mechanism of AltaRica to the timed case. Finally we give a translation of a Timed AltaRica specification into a usual timed automaton that can then be analysed by existing tools for ch...

Embedded systems are composed of a heterogeneous collection of digital, analog, and mixed-signal hardware components. This paper presents a method for the verification of systems composed of such a variety of components. This method utilizes a new model, timed hybrid Petri nets (THPN), to model these circuits. In particular, this paper describes an efficient, approximate algorithm to find the r...

In this paper we consider the problem of controller synthesis for timed games under imperfect information. Novel to our approach is the requirements to strategies: they should be based on a finite collection of observations and must be stuttering invariant in the sense that repeated identical observations will not change the strategy. We provide a constructive transformation to equivalent finit...

This paper describes the architecture and implementation of a constraint-based framework for rapid prototyping of distributed applications such as virtual simulations, collaborations and games. Our framework integrates three components based on (concurrent) constraint programming ideas: (1) Hybrid cc, a (concurrent) constraint modeling language for hybrid systems, (2) Sisl, a (discrete) timed c...