Auswahl der wissenschaftlichen Literatur zum Thema „Systèmes d'identification par radiofréquence – Efficacité“
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Dissertationen zum Thema "Systèmes d'identification par radiofréquence – Efficacité"
Mughal, Aiman. „Statistical analysis of the coupling effects between tags in the RFID links“. Electronic Thesis or Diss., Université Gustave Eiffel, 2024. http://www.theses.fr/2024UEFL2002.
Der volle Inhalt der QuelleDifferent empirical studies show that the effect of mutual coupling and the random position and orientation of tag antennas in a reduced volume result in a degradation of key performance indicators of an RFID system such as the read-range and the read-rate. This thesis takes part in the performance analysis of such an RFID system by exploring the physical phenomena behind the degradation and by introducing statistical techniques into investigations. Prior to the group behaviour investigations, the sensitivity and the impedance of two RFID chips (Higgs-3 and Higgs-9) have been measured. Two RFID tags have been used, a commercial one (ALN-9662) associated with the Higgs-3 chip and a home-made tag, which has been fabricated in laboratory to match the Higgs-9 chip. The read range of both tags has measured along with their antenna impedance. The measurement results have been confronted to electromagnetic simulations. In order to study various cases involving randomly positioned tags, an electromagnetic model and simulation tools (HFSS and NEC) have been used and the conclusions are based on their results while cross-validated in a few cases by measurements. To simplify any further, the RFID tags are modelled by a set of half-wave dipoles, with and without T-match, and the reader is replaced by a plane wave. The objective is to confront the behaviour of a single isolated tag to that of the same tag while surrounded by other tags and to conclude on the impact of the antenna type, the density of tags, the terminating load and the wave polarisation on the output under observation. The RFID link is studied through its forward and reverse links and by using a conventional grid model for tags including coupling. A thorough power budget analysis is conducted and the absorbed power at the level of the loads (chips) and the reradiated power at the level of the antennas are assessed. Regarding the forward link, the ratio of the absorbed power by the chip of a surrounded tag to that of an isolated tag is called normalised absorbed power and constitutes a useful tool to estimate the percentage of inactivated tags in the set. Regarding the reverse link, the Radar Cross Section (RCS) of loaded antennas with short-circuit and matched loads have been studied. The differential RCS of the isolated tag and that of the surrounded one has also been evaluated and the impact of coupling on the backscattered power have been studied. As in a high-density random context, predicting the system performances in a realistic way with a deterministic approach is impossible, several configurations of randomly positioned and oriented tags and dipoles have been simulated and the conclusions are drawn using statistical analysis. In other words, at the end of this study, the performance degradation of a particular tag in a given configuration of surrounding tags needs to be evaluated individually but the statistical moments as well as cumulative distribution functions allow to predict the behaviour of a population tags under given conditions. This thesis helps the RFID designer to assess the performance of an RFID scenario and eventually adjust some input parameters such as the density of tags in order to attain the desired objectives
Bergeret, Emmanuel. „Récupération d'énergie pour système RFID [Système d'identification par radiofréquence]“. Aix-Marseille 1, 2007. http://www.theses.fr/2007AIX11063.
Der volle Inhalt der QuellePouzin, Audrey. „Qualification d'éléments RFID en environnement opérationnel“. Grenoble INPG, 2009. http://www.theses.fr/2009INPG0150.
Der volle Inhalt der QuelleThe development of RFID technology is conditioned by the definition and validation of a number of standards and norms accepted by ail users. Ln this context, the thesis aims to enable the characterization of passive UHF RFID systems, whether in terms of regulations or real performances observed in operational environment. A first step was to identify the most relevant parameters to measure on the reader and the tag. Then, test procedures have been studied and specifie researches have been conduced in order to make the measurements reproducible and compatible with industrial needs. Thus the number of parameters to be measured has been minimized and the measurement procedure has been optimized. Series of measurements were made on different kind of readers and tags, in free space and in disturbed environments
Faugeras, Isabelle. „Couplage inductif multi-antennes : application au transfert d'énergie et d'informations pour un dispositif d'identification radiofréquence“. Lille 1, 1999. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1999/50376-1999-283.pdf.
Der volle Inhalt der QuelleRoudet, Fabrice. „Communication radiofréquence à très basse consommation d'énergie dans un environnement hautement perturbé“. Grenoble INPG, 2008. http://www.theses.fr/2008INPG0090.
Der volle Inhalt der QuelleAissat, Hakim. „Conception et réalisation d'une antenne à commutation de polarisation, en vue d'applications à l'identification par fréquence radio“. Université de Marne-la-Vallée, 2006. http://www.theses.fr/2006MARN0285.
Der volle Inhalt der QuelleBarbu, Stefan. „Conception et réalisation d'un système de métrologie RF pour les systèmes d'identification sans contact à 13,56 MHz“. Université de Marne-la-Vallée, 2005. http://www.theses.fr/2005MARN0219.
Der volle Inhalt der QuelleThe 13. 56 MHz "Contactless" systems become more and more efficient in terms of speed, memory capacity, security, etc. New research axes deal with these aspects, imposing a complete control of the physical layer, thus a thorough knowledge of the RF part. With the diversification of the consumer electronics products and the arrival of new standards such as the NFC, more and more electronic systems become equipped with a 13. 56 MHz "contactless" interface. In order to maximise the integration capacity and to control the interaction between the "RFID" part and the rest of the system, we need to control the RF parameters. The boom of "contactless" applications, such as access control, ticketing, electronic passports and visas, ID cards, for mentioning only the most widespread, imply large production volumes. From an industrial point of view, the thorough knowledge of the RF part is essential, not only for optimising manufacturing costs, but also for treating the field return. The current standardisation context provides a minimum of elements for assuring the good functioning of the "contactless" systems. In this case, the interoperability cannot be assured. Moreover, respecting a gauge does not allow an expert appraisal of the system functioning, the problems encountered in production and in field not being diagnosed in a precise manner. The subject of the present thesis is the design and the development of a metrology system for the 13. 56 MHz "contactless" systems' RF part. We have proposed ourselves to establish a methodology and some tools allowing to characterise the RF behaviour of inductive-coupling RFID system, and particularly contactless smartcards. The personal contribution can be synthesized through three approaches : 1. Exhaustive – thorough analysis of the system and its functioning 2. Curative – solving the functioning problems 3. Preventive – design and simulation The functioning problematic is analysed, emphasising most of the frequently encountered problems with the RF part of the "contactless" systems. To the problem-solving oriented work we added a component linked to the design of such devices
Mazeyrat, Johan. „Capteur de pression RFID pour le suivi des anévrismes de l'aorte abdominale“. Paris 6, 2008. http://www.theses.fr/2008PA066801.
Der volle Inhalt der QuelleLevieil, Eric. „Contributions à l'étude cryptographique de protocoles et de primitives à clé secrète“. Paris 7, 2008. http://www.theses.fr/2008PA077077.
Der volle Inhalt der QuelleThis thesis presents four subjects in cryptography. The first one is an improvement of the BKW algorithm, which is used to solve the Learning from Parity with Noise problem. The second one is the extension to arbitrary Abelian groups of cryptanalysis methods invented in characteristic 2. We apply the results to create a secure block cipher for sequences of decimal ciphers. Then we solve the problem of multiparty computation in two particular cases; the first one could be used when the bandwith is limited, and the second one deals with rational players. We propose an efficient protocol for solving the problem of rational secret sharing for two players
Cabanes, Guénaël. „Classification non supervise à deux niveaux guidée par le voisinage et la densité“. Paris 13, 2010. http://www.theses.fr/2010PA132024.
Der volle Inhalt der QuelleThe research outlined in this thesis concerns the development of approaches based on self-organizing maps (SOM) for the discovery and the monitoring of class structures in the data through unsupervised learning. We propose a simultaneously two levels clustering method. This method is based on the estimate, from the data, of connectivity and density values of the SOM's prototypes. The number of clusters is detected automatically. Moreover, the complexity is linear with the number of data. We show that it is relatively simple and efficient to adapt these algorithms to variants of the SOM in order to obtain a versatile method capable of analyzing different data types. We also propose an improvement of the quality of the SOM using the connectivity values during the learning of the prototypes. We describe a new method of condensed description of the data distribution and a heuristic measure of similarity between these models. These algorithms are based on an estimate of the underlying density for learning a modified SOM. In addition, we combine the clustering algorithm to measure similarity between distributions for the analysis of evolutionary data, and we propose an algorithm for monitoring data stream. Finally, we present two applications for tracking individuals in a RFID device. The first application is a study of the behavior of a colony of ants while moving. The second application, require tracking of customers in a store
Bücher zum Thema "Systèmes d'identification par radiofréquence – Efficacité"
Schalk, Gerhard H. RFID: MIFARE and Contactless Smartcards in Application. Susteren, Netherlands: Elektor International Media BV, 2013.
Den vollen Inhalt der Quelle finden1977-, Zhang Yan, Yang Laurence Tianruo und Chen Jiming 1978-, Hrsg. RFID and sensor networks: Architectures, protocols, and integrations. Boca Raton, Fla: Taylor & Francis, 2009.
Den vollen Inhalt der Quelle findenSameer, Kumar, Hrsg. Connective technologies in the supply chain. Boca Raton, FL: Auerbach, 2007.
Den vollen Inhalt der Quelle findenJones, Erick C. RFID in logistics: A practical introduction. Boca Raton: CRC Press, 2008.
Den vollen Inhalt der Quelle findenAuteur, Bureau Sylvain, Massit-Folléa Françoise Auteur, Waroquiers, Corine, (1979- ...)., Traduction und Davidson Sylvia Traduction, Hrsg. L'internet des objets: Quels enjeux pour l'Europe? = he internet of things : what challenges for Europe? [Paris]: Éd. de la Maison des sciences de l'homme, 2009.
Den vollen Inhalt der Quelle findenMyerson, Judith M., und Judith M. Myerson. RFID in the supply chain: A guide to selection and implementation. Boca Raton, FL: Auerbach, 2007.
Den vollen Inhalt der Quelle findenLu, Yan, Hrsg. The Internet of things: From RFID to the next-generation pervasive networked systems. Boca Raton, FL: Taylor & Francis, 2008.
Den vollen Inhalt der Quelle findenSen, Dipankar. RFID for energy & utility industries. Tulsa, Okla: Penwell, 2008.
Den vollen Inhalt der Quelle findenHedgepeth, William Oliver. RFID metrics: Decision making tools for today's supply chains. Boca Raton, FL: CRC Press, 2007.
Den vollen Inhalt der Quelle findenSyed, Ahson, und Ilyas Mohammad 1953-, Hrsg. RFID handbook: Applications, technology, security, and privacy. Boca Raton: CRC Press, 2008.
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