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The target of this research is a job shop problem with group constraints where jobs are grouped and processed together. This problem is evaluated using the average manufacturing time needed for the completion of all jobs, the number of group changes, and the number of line rests. It is a large-scale combinatorial problem where about 2000 jobs are processed. Our research group has proposed a scheduling...
The X-by-Wire systems in cars can only be accepted if they provide at least the same dependability than the traditional ones. In this paper we propose a new approach to evaluate the impact of the EMI perturbations on the dependability of an X-by-Wire architecture. The considered X-by-Wire architecture is distributed around a TDMA-like communication protocol. So a perturbation causes the loss of a...
In this work, we have explored a novel model of learning machine which seems to be able to emulate effectively the way of functioning of the traditional on-off lambda sensors (i.e. O2 sensor). These sensors are a low cost solution used in the SI (spark ignition) engines to monitor the air-fuel ratio and so to maintain a strict control of the air-fuel mixture close the stoichiometric condition. The...
Industrial control systems architectures have been evolving to the decentralization of control tasks. This evolution associated with the time-critical nature of these tasks, increases the dependability requirements for one of their most critical components: the communication system. Therefore, this is an important aspect on the control system design which must be properly evaluated. In this paper...
For mobile vehicle navigation in dynamic environments it is desirable that robots have a model of the dynamic aspects of the world. In this paper we present a method for detection and tracking of multiple moving objects using sensor information. The method uses particle filters to estimate objects states, and sample based joint probabilistic data association filters to perform the assignment of features...
The introduction of non-deterministic networks to the automation field leads to new questions in the analysis of the resulting systems often called networked control systems (NCS). To determine reaction times not only the cycle times of the controllers but also the network delays have to be taken into account. The problem further increases in reliability analysis. Here the failures of a variety of...
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