Academic literature on the topic 'Réduction du stockage des données'
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Journal articles on the topic "Réduction du stockage des données"
Chouaf, Seloua, and Youcef Smara. "Méthode de sélection des bandes à base de l'Analyse en Composantes Indépendantes appliquée aux images hyperspectrales de télédétection." Revue Française de Photogrammétrie et de Télédétection, no. 204 (April 8, 2014): 57–62. http://dx.doi.org/10.52638/rfpt.2013.22.
Full textRey, J. F. "Stockage des données en endoscopie digestive." Acta Endoscopica 20, S2 (March 1990): 381–83. http://dx.doi.org/10.1007/bf02970790.
Full textJ.-L.P. "Le stockage et la communication des données." Revue Forestière Française, S (1993): 41. http://dx.doi.org/10.4267/2042/26498.
Full textVIGNAL, A. "Bases de données en biologie." INRAE Productions Animales 13, HS (December 22, 2000): 187–89. http://dx.doi.org/10.20870/productions-animales.2000.13.hs.3836.
Full textHehn, Michel, Gregory Malinowski, and Stéphane Mangin. "Retournement d’aimantation dans un dispositif « Spintronique » par impulsion d’électrons unique ultra-courte." Photoniques, no. 108 (May 2021): 36–39. http://dx.doi.org/10.1051/photon/202110836.
Full textMetay, A., B. Mary, D. Arrouays, J. Labreuche, M. Martin, B. Nicolardot, and J. C. Germon. "Effets des techniques culturales sans labour sur le stockage de carbone dans le sol en contexte climatique tempéré." Canadian Journal of Soil Science 89, no. 5 (November 1, 2009): 623–34. http://dx.doi.org/10.4141/cjss07108.
Full textGaultier, M. "Une base de données en anthropologie adaptée pour l'archéologie préventive. Usages, enjeux et limites au service de l'archéologie du département d'Indre-et-Loire (Sadil)." Bulletins et Mémoires de la Société d'Anthropologie de Paris 29, no. 3-4 (March 17, 2017): 159–64. http://dx.doi.org/10.1007/s13219-017-0179-8.
Full textJouini, Khaled, and Geneviève Jomier. "Modèles de stockage orientés interrogation pour bases de données temporelles." Ingénierie des systèmes d'information 15, no. 1 (February 28, 2010): 61–85. http://dx.doi.org/10.3166/isi.15.1.61-85.
Full textStone, MR, GE Faulkner, and RN Buliung. "Quel est le niveau d'activité physique des enfants de Toronto? Analyse de données d'accélérométrie et comparaison avec l'Enquête canadienne sur les mesures de la santé." Maladies chroniques et blessures au Canada 33, no. 2 (March 2013): 70–79. http://dx.doi.org/10.24095/hpcdp.33.2.02f.
Full textMbaye, Moussa, Elhadji Faye, Mamoudou Abdoul Toure, and Awa Ba. "Identification des caractéristiques techniques des systèmes de culture et de stockage d’oignon (<i>Allium cepa</i> L.) de la vallée du fleuve Sénégal." International Journal of Biological and Chemical Sciences 17, no. 5 (October 29, 2023): 1832–48. http://dx.doi.org/10.4314/ijbcs.v17i5.5.
Full textDissertations / Theses on the topic "Réduction du stockage des données"
Jemel, Mayssa. "Stockage des données locales : sécurité et disponibilité." Electronic Thesis or Diss., Paris, ENST, 2016. http://www.theses.fr/2016ENST0053.
Full textDue to technological advancements, people are constantly manipulating multiple connected and smart devices in their daily lives. Cross-device data management, therefore, remains the concern of several academic and industrial studies. The proposed frameworks are mainly based on proprietary solutions called private or closed solutions. This strategy has shown its deficiency on security issues, cost, developer support and customization. In recent years, however, the Web has faced a revolution in developing standardized solutions triggered by the significant improvements of HTML5. With this new version, innovative features and APIs are introduced to follow business and user requirements. The main purpose is to provide the web developer with a vendor-neutral language that enables the implementation of competing application with lower cost. These applications are related neither to the used devices nor to the installed software. The main motivation of this PhD thesis is to migrate towards the adoption of standardized solutions to ensure secure and reliable cross-device data management in both the client and server side. There is already a proposed standardized Cloud Digital Safe on the server side storage that follows the AFNOR specification while there is no standardized solution yet on the client-side. This thesis is focused on two main areas : 1) the proposal of a standardized Client Digital Safe where user data are stored locally and 2) the synchronization of these data between the Client and the Cloud Digital Safe and between the different user devices. We contribute in this research area in three ways. First, we propose a Client Digital Safe based on HTML5 Local Storage APIs. We start by strengthening the security of these APIs to be used by our Client Digital Safe. Second, we propose an efficient synchronization protocol called SyncDS with minimum resource consumption that ensures the synchronization of user data between the Client and the Cloud Digital Safe. Finally, we address security concerns, in particular, the access control on data sharing following the Digital Safe requirements
Bouabache, Fatiha. "Stockage fiable des données dans les grilles, application au stockage des images de checkpoint." Paris 11, 2010. http://www.theses.fr/2010PA112329.
Full textRollback/recovery solutions rely on checkpoint storage reliability (after a failure, if the checkpoint images are not available, the rollback operation fails). The goal of this thesis is to propose a reliable and an efficient checkpoint storage service. By reliable, we mean that whatever the scenario of failures is, as long as it respects the assumptions made by the algorithms, the checkpoint images are still available. And we mean by efficient, minimizing the time required to transfer and to store the checkpoint images. This will minimize the global execution time of the checkpoint waves. To ensure those two points (reliability and efficiency), we propose: 1. A new coordinated checkpoint protocol which tolerates checkpoint server failures and clusters failures, and ensures a checkpoint storage reliability in a grid environment; 2. A distributed storage service structured on three layers architecture: a) The replication layer: to ensure the checkpoint storage reliability, we propose to replicate the images over the network. Ln this direction, we propose two hierarchical replication strategies adapted to the considered architecture and that exploit the locality of checkpoint images in order to minimize inter-cluster communication. B) The scheduling layer: at this level we work on the storage efficiency by reducing the data transfer time. We propose an algorithm based on the uniform random sampling of possible schedules. C) The scheduling engine: at this layer, we develop a tool that implements the scheduling plan calculated in the scheduling layer
Lopez, Olivier. "Réduction de dimension en présence de données censurées." Phd thesis, Rennes 1, 2007. http://tel.archives-ouvertes.fr/tel-00195261.
Full textvariable explicative. Nous développons une nouvelle approche de réduction de la dimension afin de résoudre ce problème.
Devigne, Julien. "Protocoles de re-chiffrement pour le stockage de données." Caen, 2013. http://www.theses.fr/2013CAEN2032.
Full textPrivacy is one of the main issues of our modern day society in which the Internet is omnipotent. In this thesis, we study some technics allowing to realise a privacy-preserving cloud storage. In this way, we focus to protect stored data while allowing their owner to share them with people of his choice. Proxy re-encryption, one of the primitives offered by cryptography, is the solution we decide to consider. First, we give a definition of a proxy re-encryption system unifying all existing conventional models. We also describe usual characteristics that this primitive may present and we provide its security model. Then, we focus more precisely on some specific schemes in order to improve their security. In this meaning, we expose a method which turns a scheme secure against a replayable chosen ciphertext attack into a secure scheme against a chosen ciphertext attack. We study schemes based on the Hash ElGamal encryption too and propose some modifications in order to reach a better security. Finally and in order to obtain the most functional cloud storage, we propose two new models. The first one, that we call combined proxy re-encryption, offers dynamic right access. The second one, that we call selective proxy re-encryption, enables a more fine-grained access right control than the one offered by the conditional proxy re-encryption
Hadjar, Abdelkader. "Catalyseurs électrochimiques pour le stockage et la réduction des oxydes d'azote (NOx)." Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10111.
Full textThe main objective of this study was to demonstrate the coupling between NOx storage/reduction process on barium, with an electrochemical reduction of NOx (micro fuel cell effect) on the same catalyst. The micro fuel cell effect is ensured by a an electromotive force (potential) which is created between catalytic nanoparticules (Pt and Rh) in contact with an ionic conductor (YSZ) and an electronic conductor (doped SiC). The micro fuel cell effect was observed, during the regeneration phase of the catalysts (rich period), on a Pt/Ba/doped α-SiC-YSZ/Rh monolithic system under lean-burn gasoline conditions at 400°C with an enhancement of about 10 % of the NOx conversion over a complete cycle lean/rich. This electrochemical effect was characterized by the electrochemical oxidation of CO (produced by steam reforming) into CO2 by using O2- ions coming from YSZ. Under Diesel conditions, the micro fuel cell system was found to work at low temperature especially at 300°C. In the second part of the work, a new generation of NOx Storage and reduction catalyst was developed consisting only of noble metals (Pt and/or Rh) deposited on YSZ support (Ba free catalyst). The catalytic measurements revealed that YSZ can be used as a NOx storage material in lean burn conditions (Gasoline and Diesel) especially when it was previously reduced under hydrogen. The storage mechanism would take place on the oxygen vacancies created by the removal of O-2 ions from the YSZ structure
Berland, Sébastien. "Préparation, caractérisation et activité de matériaux pour la réduction des NOx par l'ammoniac ; Association au catalyseur de stockage-réduction." Poitiers, 2011. http://nuxeo.edel.univ-poitiers.fr/nuxeo/site/esupversions/5113f776-4c92-453d-8e7b-4655c49cce2f.
Full textThis work deals with clean exhaust motor and more particularly on the combination of two processes for NOx reduction systems: NSR (NOx Storage-Reduction) and SCR (Selective Catalytic Reduction). In operating conditions, the NSR catalysts are likely to emit ammonia, which is also a good reducer of NOx. The addition of an acidic and active SCR-NH3 material on a second catalytic bed downstream, can use this ammonia to increase the overall reduction of NOx. The chosen NSR catalyst is type of Pt-Ba/Al which, in the functioning of the system (alternating oxidizing phases of NOx storage and short pulses of reducers) led to high selectivity in ammonia when H2 is used as a reducing agent. For the second catalytic bed, three types of material have been studied: industrial materials, WO3/Ce-Zr of Ce-Zr variable composition and materials synthesized in the laboratory (sol-gel route): from an alumina base, successive incorporations of Ce, Ti, and Si have been formulated active materials, improved by addition of tungsten. The materials have been characterized by different techniques: XRD, BET, measures of acidity (NH3, pyridine adsorption storage), of reducibility (RTP-H2, OSC), test of reactivity (NH3+ NOx, NH3 + O2),. . . The association of two processes (NSR + SCR) showed that on materials of SCR-NH3, NOx are reduced according to two reactions: the "fast SCR-NH3"(200, 300 and 400°C), and "standard SCR-NH3"(at 200°C). Furthermore, a part of ammonia may also react with O2 to give N2 (300-400°C) and the storage of NH3 at 400°C remains insufficient
Khelil, Amar. "Elaboration d'un système de stockage et exploitation de données pluviométriques." Lyon, INSA, 1985. http://www.theses.fr/1985ISAL0034.
Full textThe Lyon District Urban Area (CO. UR. LY. ) may be explained from an hydrological point of view as a 600 km2 area equipped with a sewerage system estimated by 2 000 km of pipes. Due to the complexity of the sewerage network of the area, it must therefore be controlled by an accurate and reliable system of calculation to avoid any negative consequences of its function. The capacity of the present computerising system SERAIL, allows an overall simulation of the functioning of drainage / sewerage system. This model requires an accurate information of the rainfall rate which was not previously available. Therefore a 30 rain gages network (with cassette in sit recording) was set up within the Urban District Area in 1983. This research however introduces the experiment of three steps: 1) to install the network; 2) to build up a data checking and storage system; 3) to analyse the data. The characteristic nature of this work deals with the data analysis system. It allows to extract easily and analyse any rainfall event important to the hydrologist. Two aims were defined: 1) to get a better understanding of the phenomena (punctual representations ); 2) to build up models. In order to achieve the second aim, it was necessary to think about the fitting of the propounded models and their limits which led to the setting up of several other programmes for checking and comparison. For example a complete analysis of a rainfall event is given with comments and conclusion
Jule, Alan. "Etude des codes en graphes pour le stockage de données." Thesis, Cergy-Pontoise, 2014. http://www.theses.fr/2014CERG0739.
Full textFor two decades, the numerical revolution has been amplified. The spread of digital solutions associated with the improvement of the quality of these products tends to create a growth of the amount of data stored. The cost per Byte reveals that the evolution of hardware storage solutions cannot follow this expansion. Therefore, data storage solutions need deep improvement. This is feasible by increasing the storage network size and by reducing data duplication in the data center. In this thesis, we introduce a new algorithm that combines sparse graph code construction and node allocation. This algorithm may achieve the highest performance of MDS codes in terms of the ratio R between the number of parity disks and the number of failures that can be simultaneously reconstructed. In addition, encoding and decoding with sparse graph codes helps lower the complexity. By this algorithm, we allow to generalize coding in the data center, in order to reduce the amount of copies of original data. We also study Spatially-Coupled LDPC (SC-LDPC) codes which are known to have optimal asymptotic performance over the binary erasure channel, to anticipate the behavior of these codes decoding for distributed storage applications. It is usually necessary to compromise between different parameters for a distributed storage system. To complete the state of the art, we include two theoretical studies. The first study deals with the computation complexity of data update and we determine whether linear code used for data storage are update efficient or not. In the second study, we examine the impact on the network load when the code parameters are changed. This can be done when the file status changes (from a hot status to a cold status for example) or when the size of the network is modified by adding disks. All these studies, combined with the new algorithm for sparse graph codes, could lead to the construction of new flexible and dynamical networks with low encoding and decoding complexities
Atigui, Faten. "Approche dirigée par les modèles pour l’implantation et la réduction d’entrepôts de données." Thesis, Toulouse 1, 2013. http://www.theses.fr/2013TOU10044/document.
Full textOur work handles decision support systems based on multidimensional Data Warehouse (DW). A Data Warehouse (DW) is a huge amount of data, often historical, used for complex and sophisticated analysis. It supports the business process within an organization. The relevant data for the decision-making process are collected from data sources by means of software processes commonly known as ETL (Extraction-Transformation-Loading) processes. The study of existing systems and methods shows two major limits. Actually, when building a DW, the designer deals with two major issues. The first issue treats the DW's design, whereas the second addresses the ETL processes design. Current frameworks provide partial solutions that focus either on the multidimensional structure or on the ETL processes, yet both could benefit from each other. However, few studies have considered these issues in a unified framework and have provided solutions to automate all of these tasks. Since its creation, the DW has a large amount of data, mainly due to the historical data. Looking into the decision maker's analysis over time, we can see that they are usually less interested in old data.To overcome these shortcomings, this thesis aims to formalize the development of a time-varying (with a temporal dimension) DW from its design to its physical implementation. We use the Model Driven Engineering (MDE) that automates the process and thus significantly reduce development costs and improve the software quality. The contributions of this thesis are summarized as follows: 1. To formalize and to automate the development of a time-varying DW within a model-driven approach that provides: - A set of unified (conceptual, logical and physical) metamodels that describe data and transformation operations. - An OCL (Object Constraint Language) extension that aims to conceptually formalize the transformation operations. - A set of transformation rules that maps the conceptual model to logical and physical models. - A set of transformation rules that generates the code. 2. To formalize and to automate historical data reduction within a model-driven approach that provides : - A set of (conceptual, logical and physical) metamodels that describe the reduced data. - A set of reduction operations. - A set of transformation rules that implement these operations at the physical level.In order to validate our proposals, we have developed a prototype composed of three parts. The first part performs the transformation of models to lower level models. The second part transforms the physical model into code. The last part allows the DW reduction
Kwémou, Djoukoué Marius. "Réduction de dimension en régression logistique, application aux données actu-palu." Thesis, Evry-Val d'Essonne, 2014. http://www.theses.fr/2014EVRY0030/document.
Full textThis thesis is devoted to variables selection or model selection in logistic regression. The applied part focuses on the analysis of data from a large socioepidémiological survey, called actu-palu. These large socioepidemiological survey typically involve a considerable number of explanatory variables. This is well-known as high-dimensional setting. Due to the curse of dimensionality, logistic regression model is no longer reliable. We proceed in two steps, a first step of reducing the number of variables by the Lasso, Group Lasso ans random forests methods. The second step is to apply the logistic model to the sub-set of variables selected in the first step. These methods have helped to select relevant variables for the identification of households at risk of having febrile episode amongst children from 2 to 10 years old in Dakar. In the methodological part, as a first step, we propose weighted versions of Lasso and group Lasso estimators for nonparametric logistic model. We prove non asymptotic oracle inequalities for these estimators. Secondly we extend the model selection principle introduced by Birgé and Massart (2001) to logistic regression model. This selection is done using penalized macimum likelihood criteria. We propose in this context a completely data-driven criteria based on the slope heuristics. We prove non asymptotic oracle inequalities for selected estimators. The results of the methodological part are illustrated through simulation studies
Books on the topic "Réduction du stockage des données"
Keith, David W. Élaboration d'une stratégie en vue du captage et du stockage du CO2 au Canada. Ottawa, Ont: Environnement Canada, 2002.
Find full textCamara, Diatta. Données pour les politiques et programmes de développement: Besoins d'information statistique dans les Documents de stratégie de réduction de la pauvreté : Atelier régional de formation sur les nouveaux outils d'analyse des données socio-démographiqes issues d'opérations de collecte de grande envergure. Dakar Ponty, Sénégal: UNPFA/Country Technical Services Team Dakar, 2005.
Find full textBuilding storage networks. Berkeley: Osborne/McGraw-Hill, 2000.
Find full textFarley, Marc. Building storage networks. 2nd ed. New York: Osborne/McGraw-Hill, 2001.
Find full textBuilding Storage Networks. New York: McGraw-Hill, 2002.
Find full textNetwork, Canadian Harm Reduction. Learning from each other: Enhancing community-based harm reduction programs and practices in Canada. Ottawa, Ont: Canadian AIDS Society, 2008.
Find full textLogiciels de stockage de données. Vuibert, 2001.
Find full textKimball, Ralph. Data Warehouse Toolkit: The Complete Guide to Dimensional Modeling. Wiley & Sons, Incorporated, John, 2007.
Find full textKimball, Ralph. The Data Warehouse Toolkit: The Complete Guide to Dimensional Modeling (Second Edition). Wiley, 2002.
Find full textKimball, Ralph. Data Warehouse Toolkit: The Definitive Guide to Dimensional Modeling. Wiley & Sons, Incorporated, John, 2013.
Find full textBook chapters on the topic "Réduction du stockage des données"
PUTEAUX, Pauline, and William PUECH. "Insertion de données cachées dans le domaine chiffré." In Sécurité multimédia 2, 233–77. ISTE Group, 2021. http://dx.doi.org/10.51926/iste.9027.ch7.
Full textPOUYLLAU, Stéphane. "Nakala : service de publication de données." In Partage et valorisation des données de la recherche, 107–26. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9073.ch6.
Full text"Chapitre 9 • Mesure physique et réduction de données." In Guide pratique pour (bien) débuter en spectroscopie astronomique, 155–72. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1950-8-011.
Full text"Chapitre 9 • Mesure physique et réduction de données." In Guide pratique pour (bien) débuter en spectroscopie astronomique, 155–72. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1950-8.c011.
Full textBYSTROVA, Daria, Giovanni POGGIATO, Julyan ARBEL, and Wilfried THUILLER. "Réduction de la dimension dans les modèles de distributions jointes d’espèces." In Approches statistiques pour les variables cachées en écologie, 151–74. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9047.ch7.
Full textLEBLOND, Cédric. "Méthodes « avancées » en vibro-acoustique des structures navales." In Interactions fluide-structure, 87–118. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9078.ch4.
Full textCALVET, Louis-Jean. "Quels liens entre langues et mondialisation ?" In Langue(s) en mondialisation, 7–14. Editions des archives contemporaines, 2022. http://dx.doi.org/10.17184/eac.5202.
Full textConference papers on the topic "Réduction du stockage des données"
Sicard, L., A. B. Kaddour, D. O'Hana, and R. Khonsari. "Luxation bilatérale de l’articulation temporo-mandibulaire chez l’enfant." In 66ème Congrès de la SFCO. Les Ulis, France: EDP Sciences, 2020. http://dx.doi.org/10.1051/sfco/20206602015.
Full textReports on the topic "Réduction du stockage des données"
Touré, Mariama, Elodie Becquey, Lieven Huybregts, Dieynab Diatta, Andrew Booth, and Roosmarijn Verstraeten. Cartographie des données probantes sur les programmes de réduction de l’émaciation et leur impact le long du continuum de soins, dans les pays à revenu faible ou intermédiaire : revue rapide des résultats de recherche. Washington, DC: International Food Policy Research Institute, 2021. http://dx.doi.org/10.2499/p15738coll2.134682.
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