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Auswahl der wissenschaftlichen Literatur zum Thema „Systèmes d'identification par radiofréquence – Conception et construction“
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Dissertationen zum Thema "Systèmes d'identification par radiofréquence – Conception et construction"
Mudakkarappilli, Sudersanan Jithin. „Accurate experimental and numerical characterization of the forward and reverse RFID links for strongly coupled tags including nonlinearity of chip impedance“. Electronic Thesis or Diss., Université Gustave Eiffel, 2024. http://www.theses.fr/2024UEFL2029.
Der volle Inhalt der QuelleThe context of this thesis is primarily centered around UHF RFID scenarios which involve a large number of tags randomly distributed and confined in an electrically reduced volume. The proximity of the radiating elements would result in significant electromagnetic coupling between the tag antennas, impacting the communication link between the reader and the tags. Consequently, the key performance indicators of the system such as read-range and read-rate get degraded. This research work presents a performance analysis of such an RFID system by including statistical aspects. To this aim, a model for the forward and reverse links including coupling effects between the tags is presented, which is validated by electromagnetic simulations and measurements. Prior to delving into the analysis involving a set of tags, a comprehensive characterization of the home-made RFID tag integrated with a Higgs-9 chip which is used in the study is performed. The antenna impedance is simulated and measured, while the nonlinear chip impedance is characterized by an impedance analyzer. The whole tag composed of the home-made antenna and the chip is tested under the RFID protocols. Considering the complexity of the problem at hand, the set of RFID tags under study is also modeled by a set of loaded dipoles in order to simplify their electromagnetic model provided that a high correlation between their behaviour could be proved. At this stage, the monostatic RCS is studied with an objective of highlighting the degradation in the response of an isolated tag to that of the same tag while surrounded by other tags. The coupling effects on the impedance and the radiation pattern of a tag are thus included in this monostatic RCS response. Afterwards, the forward link is analyzed in terms of the power absorbed by the chip and the maximum read-range of an interrogated tag while being surrounded by neighboring loaded tags. Interestingly a clear correlation is observed between the power absorbed by the chip obtained by simulation and the maximum read-range which is obtained by simulation and measured under RFID protocol. Multiple random configurations of tags have been tested and as a result of this part, a circuit-level observable is correlated to a direct system-level observable. The performance degradation due to coupling in the reverse link is analyzed in terms of the differential RCS, as it is indicative of the modulation depth from the tag. The differential RCS is calculated using the estimated reflection coefficients of the surrounded tag for two different load levels and is also measured directly under RFID protocol. As the last part, this research work takes into account the impact of nonlinear evolution of the complex chip impedance, along with coupling effects in the reverse link. Knowing that the chip impedance is a function of the input power, a mapping procedure is presented for the chip impedance estimation. The coupling model provides the power delivered to the chip, which is then mapped to obtain the nonlinear chip impedance of each tag in a set of randomly distributed tags. The inferences drawn from this work when combined with relevant statistical data could be used by RFID design engineers to assess the performance of an RFID scenario while being exposed to both mutual coupling and nonlinearities
Iliev, Plamen. „Méthode de conception et optimisation d'antennes pour étiquettes RFID multi-standards“. Nice, 2009. http://www.theses.fr/2009NICE4065.
Der volle Inhalt der QuelleRFID is a technology known for the possibilities it offers for people, animal and object identification. This technology allows a fast, effective and cost-efficient identification process thanks to its various standards and functioning types. In an RFID system, the tag design and the optimization of its antenna are key reliability factors. This study puts forward an explanation of the different RFID tags as well as the techniques used to optimize their antennas. In this study, we look closely at the different types of electromagnetic fields concerned and define the corresponding types of antenna. We also analyze the influence of environmental factors such as the manufacturing materials, and propose different suitable antenna structures. Finally we study, through different models, the possibility to create multistandard tags by mastering the coupling of their antennas. The different parameters of RFID tags conception are therefore specified and controlled
Aissat, 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
Kubicki, Sébastien. „Contribution à la prise en considération du contexte dans la conception de tables interactives sous l'angle de l'IHM : application à des contextes impliquant table interactive RFID et objets tangibles“. Valenciennes, 2011. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/31b1e9e7-6f19-46ca-b546-5c5c5f816bf7.
Der volle Inhalt der QuelleThis thesis contributes to the Human-Computer Interaction domain. It aims to take into account the context of use for the interactive tables. By the concept of interactive table, one can suppose a collaborative and co-localized workspace allowing several users to work at the same time but also new interactions mixing tangible and/or virtual objects. That is due to these observations and to the interest granted to these new platforms that we proposed to characterize and to list them by using a model that we proposed. The context is a concept used for a long time in the interactive applications design. Research in HCI brought many elements making it possible to define and to qualify it thoroughly. Our proposal aims so to take into account the context for the interactive tables. For that, we initially modeled the context such as it can be defined in the literature. Then we increased this model in order to adapt it to the use of the interactive tables. A set of formalisms making it possible to define the context for the interactive tables are also presented, those bring up us to propose an adaptation system to the context then a set of adaptation rules. We carry out the adaptation to the context by using the TangiSense interactive table. For that we use, and implement our suggested adaptation rules in order to allow the TangiSense interactive table to adapt itself according to the context. In order to evaluate the whole of the elements proposed in this thesis, two studies were conducted: the first one in laboratory, the second one in a natural environment in nursery school. A set of research prospects finishes the report
Etrog, Jonathan. „Cryptanalyse linéaire et conception de protocoles d'authentification à sécurité prouvée“. Versailles-St Quentin en Yvelines, 2010. http://www.theses.fr/2010VERS0025.
Der volle Inhalt der QuelleThis Ph. D, devoted to symmetric cryptography, addresses two separate aspects of cryptology. First, the protection of messages using encryption algorithms and, second, the protection of privacy through authentication protocols. The first part concerns the study of linear cryptanalysis while the second is devoted to the design of authentication protocols with proven security. Although introduced in the early 90s, linear cryptanalysis has recently experienced a revival due to the development of new variants. We are both interested in its practical and theoretical aspects. First, we present a cryptanalysis of a reduced version of SMS4, the encryption algorithm used in WiFi in China then, second, we introduce multilinear cryptanalysis and describe a new form of multilinear cryptanalysis. The second part of the thesis concerns the study of RFID authentication protocols respecting privacy. We define a model to formalize the notions of security for these protocols. Then we propose two protocols, each one performing a compromise between strong unlinkability and resistance to denial of service attacks, which allow low-cost implementations. We establish security proofs in the standard model for these two protocols
Ragad, Hedi. „Etude et conception de nouvelles topologies d’antennes à résonateur diélectrique dans les bandes UHF et SHF“. Nantes, 2013. http://archive.bu.univ-nantes.fr/pollux/show.action?id=dbef930c-a344-473d-af02-0038c8fcda98.
Der volle Inhalt der QuelleThis thesis proposes the study and design of new topologies of dielectrics resonators antennas in the UHF and SHF bands. The first part is devoted to the state of the art and to the fundamental characteristics of these antennas. The second part is focused on the design of new types of antennas from the canonical shapes in order to expand their bandwidth for multi-standard applications without changing the distribution of their radiation pattern in free space. Then our interest is focused on the realization of multiband antennas. The first structure is based on the excitation of two modes of a rectangular dielectric resonator antenna, at two different frequencies. The second one is a dielectric resonator antenna (DRAs) with two concentric resonators with different permittivities. They are excited each one on its fundamental mode to obtain a bi-band behavior. In the last part of the study, we are interested in the design of miniature DRAs for UHF RFID applications. We use in this case, materials with high permittivity and we place a layer of metamaterial over the resonator to improve the gain
Mozef, Eril. „Conception et étude d'une architecture parallèle à réseau linéaire de processeurs et mémoires CAM pour le traitement d'image“. Nancy 1, 1997. http://www.theses.fr/1997NAN10116.
Der volle Inhalt der QuelleThe works on characterization of objects in an image incited the design of a dedicated architecture for connected-component labeling. Due to both local and global properties, this operation is extremely time costly when a sequential approach is applied. In the case of a parallel approach, it has been demonstrated that the labeling complexity is inversely proportional to the number of processors. In order to reduce the complexity, many of the existing solutions require a large number of processors. However, the "Processor-Time" product has to be considered to obtain an optimal architecture particularly if VLSI implementation is envisaged. The primary objective of this work was to design a parallel dedicated architecture for labeling with both weak product and good tradeoff of "Processor-Time". For this, a Maresca algorithm, implemented in a 2-D array of processors, Polymorphic-Torus was adapted. The structure obtained has a 1-D array of processors with CAM memories. [. . . ]
Yu, Jihong. „Comptage et surveillance d'étiquettes dans des systèmes RFID à grande échelle : base théorique et conception d'algorithmes“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS545/document.
Der volle Inhalt der QuelleRadio Frequency Identification (RFID) technology has been deployed in various applications, such as inventory control and supply chain management. In this thesis, we present a systematic research on a number of research problems related to tag counting and monitoring, one of the most fundamental component in RFID systems, particularly when the system scales. These problems are simple to state and intuitively understandable, while of both fundamental and practical importance, and require non-trivial efforts to solve. Specifically, we address the following problems ranging from theoretical modeling and analysis, to practical algorithm design and optimization. To lay the theoretical foundations for the algorithm design and optimization, we start by studying the stability of frame slotted Aloha. We model system backlog as a Markov chain. The main objective is translated to analyze the ergodicity of the Markov chain. We then establish a framework of stable and accurate tag population estimation schemes based on Kalman filter for both static and dynamic RFID systems. We further proceed to addressing the problem of missing tag detection, one of the most important RFID applications. Different from existing works in this field, we focus on two unexplored while fundamentally important scenarios, missing tag detection in the presence of unexpected tags and in multiple-group multiple-region RFID systems. In the first scenario, we develop a Bloom filter-based protocol. In the second scenario, we develop three protocols by incorporating an improved version of the Bloom filter design
Lee, Jin-Rang. „Processus communicationnel de la normalisation en matière de TIC (Technologies de l'Information et la Communication) En Corée du Sud et en France : pour une construction sociale de la démocratie technique“. Paris 10, 2009. http://www.theses.fr/2009PA100148.
Der volle Inhalt der QuelleThe present research focuses on the emergence of new actors and new rationalities in the communication process of Information and Communication Technology (ICT) standards. Standardization emerged in the 20th century from the economic logic of industrialization. At the dawn of the 21st century it is becoming a tool for democracy for technology development. And, social, political and cultural logics are being added to the economic logic present in the standardization process. A content analysis of reports from South Korean (KATS, TTA) and French (AFNOR) standards organizations underscores the difficulties that policy makers have in mediating between the economic and emerging societal logics present in the standardization process. These difficulties, however, do not prevent new actors from taking part in this process. If the consumer as an economic actor was the main participant of this process, a lot of new discussion items, such as the privacy, human rights, and copyleft movement, call citizens and workers to participate in the standardization process. By undertaking four case studies (RFID, biometrics, electromagnetic problems associated with mobile phones and multilingualism) the government’s role in managing the democracy for technology development in South Korea and France becomes apparent. France is trying to institutionalize the relationship between actors and different organizations (CNIL, forum des droits sur Internet, AFSSE). In South Korea, on the other hand, there is an active movement outside of the institutional structures that includes a range of social actors who take advantage of ICT developments such as Web 2. 0 and mobile phones