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Academic literature on the topic 'Diagnostic filaire complexe'
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Journal articles on the topic "Diagnostic filaire complexe"
Halim, Kazi Shafiqul, Be Nazir Ahmed, Fatema Nargis, Ferdoushi Begum, Rafia Akhter, Qazi Hena Ferdousi, and Israt Jahan Ummon. "Evaluation of Endemic Status of Lymphatic Filariasis in Areas Adjoining to the Endemic District of Bangladesh." Bangladesh Medical Journal 48, no. 2 (May 30, 2019): 13–19. http://dx.doi.org/10.3329/bmj.v48i2.51260.
Full textHalim, Kazi Shafiqul, Be Nazir Ahmed, Fatema Nargis, Ferdoushi Begum, Rafia Akhter, Qazi Hena Ferdousi, and Israt Jahan Ummon. "Evaluation of Endemic Status of Lymphatic Filariasis in Areas Adjoining to the Endemic District of Bangladesh." Bangladesh Medical Journal 48, no. 2 (May 30, 2019): 13–19. http://dx.doi.org/10.3329/bmj.v48i2.51260.
Full textAUZANNEAU, Fabrice. "Diagnostic filaire - Détection, localisation et caractérisation de défauts dans des réseaux filaires complexes." Problématiques communes des réseaux électriques : du fonctionnement au comptage, August 2015. http://dx.doi.org/10.51257/a-v1-in118.
Full textAUZANNEAU, Fabrice. "Diagnostic filaire - Détection, localisation et caractérisation de défauts dans des réseaux filaires complexes." Réseaux électriques et applications, April 2023. http://dx.doi.org/10.51257/a-v2-in118.
Full textDissertations / Theses on the topic "Diagnostic filaire complexe"
Lelong, Adrien. "Méthodes de diagnostic filaire embarqué pour des réseaux complexes." Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10121/document.
Full textResearch works presented in this thesis rely on on line diagnosis of wire networks. It consists indetecting and locating intermittent or permanent electrical faults, on a system's network while this system is running. Such a diagnosis is based on the principle of reflectometry which is used for off line diagnosis until then. The aim is the analysis and improvement of reflectometry methods and the implementation of related processing in order to automate and to embed it in the target system for a real time execution. The first contribution refers to the use of multicarrier signals so as to minimize interferences between the running target system and the reflectometry module. Pulse deconvolution algorithms are required for this purpose. These algorithms are also used for high resolution processing described subsequently. A low computational cost semi-blind deconvolution method is proposed among others. Distributed reflectometry, consisting in the simultaneous injection of signals at several points of the network, is then studied. An innovative filtering method called "selective average" is proposed as a solution to the problem of interferences due to the simultaneous injection of the modules. Finally several considerations on the implementation and automation are studied. An innovative intermittent fault detection algorithm for noisy environment is also proposed
Taki, Nour. "Diagnosis of Soft Faults in Complex Wired Networks." Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG004.
Full textElectrical cables are used in all sectors to transfer energy or information. During operation, the cables may be subject to hard faults (open circuit, short circuit) or soft faults (isolation damage, pinching, etc.) due to misuse, environmental conditions, or aging. These faults must be detected at their earliest stage to avoid interruption of the function or more serious consequences. Even though several electric and non-electric wire diagnosis methods have been studied and developed throughout the last few decades, reflectometry-based techniques have provided effective results with hard faults. However, they have been shown to be less reliable whenever soft faults are addressed.Indeed, soft faults are characterized by a small impedance variation, resulting in a low amplitude signature on the corresponding reflectograms. Accordingly, the detection of these faults depends strongly on the test signal configuration, such as its bandwidth. Although the increase of the maximal frequency of the test signal enhances the soft fault's ''spatial'' resolution, its performance is limited by signal attenuation and dispersion. Moreover, although reflectometry offers good results in point-to-point topology networks, it suffers from ambiguity related to fault location in more complex wired networks (Multi-branched). As a solution, distributed reflectometry method, where sensors are implemented in the extremities of the network under test, is used. However, several issues are enforced, from the computing complexities and sensors fusion problems to the energy consumption.In this context, this Ph.D. dissertation proposes to develop two approaches: the first selects the best maximal frequency for soft fault detection, and the second selects the most relevant sensors to monitor and diagnose those faults in multi-branched wired networks. The proposed solution is based on a combination between reflectometry and Principal Component Analysis (PCA). The PCA model coupled with statistical analysis based on Hotelling’s T² and Squared Prediction Error (SPE) is used to detect the soft faults and select the required parameters. Experimental validation is carried out, and performance analysis in the presence of noise is investigated
Ravot, Nicolas. "Analyse et diagnostic de réseaux filaires complexes par réflectométrie." Paris 11, 2007. http://www.theses.fr/2007PA112142.
Full textThe evolution of technologies and the communication modules involve a growing complexity of the embedded systems. These systems are smarter and use more and more sensors and others components. The increase of embedded systems implies the increase of wired network that is the physical support for the data transfer and devices supply. A wired network is composed of several kinds of cables and connectors. These systems can operate in different environments and conditions that can induce failures, because of a defective cable. Nowadays, several problems begin to appear in the wired networks. A tool for diagnosing a wired network would be greatly helpful for maintenance and monitoring. The proposed solution in this thesis allows analysing and diagnosing the health of a wired network without ambiguities. We have developed a new method, called distributed reflectometry by M-sequences, which is more effective and more reliable for analysing wired networks and which considers different aspects such as integration, precision and performance. Indeed, the diagnosis function distribution in a wired network allows apprehending a complete network and guarantees a simple reflectograms analysis without incorrect interpretations. This original method, purely numerical, is an adequate solution for embedded applications
Ben, Hassen Wafa. "Étude de stratégies de diagnostic embarqué des réseaux filaires complexes." Thesis, Toulouse, INPT, 2014. http://www.theses.fr/2014INPT0084/document.
Full textThis study addresses embedded diagnosis of complex wired networks. Based on the reflectometry method, it aims at detecting and locating accurately electrical faults. Increasing demand for on-line diagnosis has imposed serious challenges on interference mitigation. It aims at making diagnosis while the target system is running. The interference becomes more critical in the case of complex networks where several reflectometers are injecting their test signals simultaneously. The objective is to develop new embedded diagnosis strategies in complex wired networks that would resolve interference problems and eliminate ambiguity related to the fault location. The first contribution is the development of a new method called OMTDR (Orthogonal Multi-tone Time Domain Reflectometry). It uses orthogonal modulated digital signals for interference mitigation and thereby on-line diagnosis. For better coverage of the network, the second contribution proposes to integrate communication between reflectometers. It uses sensors data fusion to facilitate decision making. The third contribution addresses the problem of the diagnosis strategy, i.e. the optimization of diagnosis performance of a complex network under operational constraints. The use of Bayesian Networks allows us to study the impact of different factors and estimate the confidence level and thereby the reliability of the diagnosis results
Osman, Ousama. "Méthodes de diagnostic en ligne, embarqué et distribué dans les réseaux filaires complexes." Thesis, Université Clermont Auvergne (2017-2020), 2020. http://www.theses.fr/2020CLFAC038.
Full textThe research conducted in this thesis focuses on the diagnosis of complex wired networks using distributed reflectometry. It aims to develop new distributed diagnostic techniques for complex networks that allow data fusion as well as communication between reflectometers to detect, locate and characterize electrical faults (soft and hard faults). This collaboration between reflectometers solves the problem of fault location ambiguity and improves the quality of diagnosis. The first contribution is the development of a graph theory-based method for combining data between distributed reflectometers, thus facilitating the location of the fault. Then, the amplitude of the reflected signal is used to identify the type of fault and estimate its impedance. The latter is based on the regeneration of the signal by compensating for the degradation suffered by the diagnosis signal during its propagation through the network. The second contribution enables data fusion between distributed reflectometers in complex networks affected by multiple faults. To achieve this objective, two methods have been proposed and developed: the first is based on genetic algorithms (GA) and the second is based on neural networks (RN). These tools combined with distributed reflectometryallow automatic detection, location, and characterization of several faults in different types and topologies of wired networks. The third contribution proposes the use of information-carrying diagnosis signal to integrate communication between distributed reflectometers. It properly uses the phases of the MCTDR multi-carrier signal to transmit data. This communication ensures the exchange of useful information (such as fault location and amplitude) between reflectometers on the state of the cables, thus enabling data fusion and unambiguous fault location. Interference problems between the reflectometers are also addressed when they simultaneously inject their test signals into the network. These studies illustrate the efficiency and applicability of the proposed methods. They also demonstrate their potential to improve the performance of the current wired diagnosis systems to meet the need and the problem of detecting and locating faults that manufacturers and users face today in electrical systems to improve their operational safety
Books on the topic "Diagnostic filaire complexe"
Ravot, Nicolas. Analyse et diagnostic de réseaux filaires complexes par réflectométrie: Mise en oeuvre du concept de la réflectométrie distribuée. OmniScriptum, 2014.
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