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Packet collision and packet delay are considered to be critical for safety applications in vehicular networks. This paper designs a new analytical model to evaluate the performance of channel switching for IEEE 802.11p/WAVE in vehicular networks. Under this model, it explicitly expresses the WAVE channel switching, and constructs contention window size and number of vehicles as packet collision probability...
In order to enable model-based, iterative design of safety-relevant systems, an efficient incorporation of safety and system engineering is a pressing need. Our approach interconnects system design and safety analysis models efficiently using a dedicated reference model. Since all information are available in a structured way, traceability between the model elements and consistency checks enable automated...
We consider the verification problem of multithreaded recursive programs. We use Process Rewrite Systems (PRS) to model such programs. This allows the use of all the existing results for the analysis of PRS to analyse multithreaded recursive programs. We first give a fully automatic translation from parallel recursive programs to PRS. As far as we know, this is the first time that a formal translation...
The continuous requirements of evolving a service-oriented application and the rising cost of shutting down services at runtime are forcing researchers to find ways of updating services while they run. Dynamic service update can solve the problem of such applications and is becoming a challenging issue. This paper presents a formal model for supporting dynamic update framework based on OSGi. The process...
In the US, the Dedicated Short Range Communications (DSRC) spectrum is organized into several channels. IEEE 1609.4 [2] defines an alternating-access channel switching scheme to enable a DSRC device to support applications concurrently on different channels. The default channel for Vehicle-to-Vehicle (V2V) safety messages is the Control Channel (CCH), but previous research has identified performance...
This work is concerned with modelling, analysis and implementation of embedded control systems using RT-DEVS, i.e. a specialization of classic DEVS (discrete event system specification) for real-time. RT-DEVS favours model continuity, i.e. the possibility of using the same model for property analysis (by simulation or model checking) and for real time execution. Special case tools are proposed in...
The construction industry has been facing a paradigm shift to (i) increase; productivity, efficiency, infrastructure value, quality and sustainability, (ii) reduce; lifecycle costs, lead times and duplications, via effective collaboration and communication of stakeholders in construction projects. Digital construction is a political initiative to address low productivity in the sector. This seeks...
Systems verification requires first to model the system to be verified, then to formalize the properties to be satisfied, and finally to describe the behaviour of the environment. This last point, known as the proof context, is often neglected. It could, however, be of great importance in order to reduce the complexity of the proof. The question is then how to formalize such a proof context. This...
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