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Distributed discrete event systems (Distributed DES) are increasing with the development of networks. A major problem of these systems is the evaluation of their performance at the design stage. We are particularly interested in assessing the impact of computer networking protocols on the control of manufacturing systems. In our design methodology, these systems are modeled using Petri nets. In this...
Communication services are surrounding our daily life; internet, mail, cellular phones... These services are managed by several protocols. In this paper we propose a generic model for the Ethernet protocol based on time Petri nets. A complete modular service-protocol model can help in better managing services and protocols and to easily change a system element without affecting the other elements...
The concept of flexible manufacturing system (FMS) has been initially introduced In enable the production of different types of parts at the same time. But dependable requirements and especially the necessity to continue to produce in spite of the breakdown of a plant component led to exploit the flexibility to reconfigure the plant. Nowadays, the challenge for researchers and industrials is thus...
In this paper, we present a conception methodology based on system requirements, within which we propose to integrate formalisation and verification into the same process. This method uses the constraint programming paradigm to synthesize Petri nets corresponding to a formal expression of requirements as constraints over the PN structure. Some additional techniques are provided to incrementally refine...
This paper intends to develop a risk apportionment methodology using functional description in order to comply with the safety targets required by the railway safety directive. A state of the art of risk apportionment strategy in various critical domains is presented and discussed. Our contribution is based on a hierarchical functional decomposition and a safety apportionment to these functions
In this paper, we present a conception methodology based on system requirements, within which we propose to integrate formalisation and verification into the same process. This method uses the constraint programming paradigm to synthesize Petri nets corresponding to a formal expression of requirements as constraints over the PN structure. Some additional techniques are provided to incrementally refine...
This paper intends to develop a risk apportionment methodology using functional description in order to comply with the safety targets required by the railway safety directive. A state of the art of risk apportionment strategy in various critical domains is presented and discussed. Our contribution is based on a hierarchical functional decomposition and a safety apportionment to these functions
In this paper, we propose a mathematical programming model for the exact resolution of the reachability problem in timed Petri nets. Such nets allow to model a large class of scheduling problems, while taking into account concurrency, parallelism and synchronisation. They are thus a natural way of dealing with "flexible" manufacturing problems, where several resources can be used for the...
The concept of flexible manufacturing system (FMS) has been initially introduced to enable the production of different types of parts at the same time. But dependable requirements and especially the necessity to continue to produce in spite of the breakdown of a plant component lead to exploit the flexibility to reconfigure the plant. Nowadays, the challenge for researchers and industrials is thus...
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