Dissertations / Theses on the topic 'Digital Surf'
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González, Valenzuela Ricardo Eugenio 1984. "Linear dimensionality reduction applied to SIFT and SURF feature descriptors." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/275499.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação
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Resumo: Descritores locais robustos normalmente compõem-se de vetores de características de alta dimensionalidade para descrever atributos discriminativos em imagens. A alta dimensionalidade de um vetor de características implica custos consideráveis em termos de tempo computacional e requisitos de armazenamento afetando o desempenho de várias tarefas que utilizam descritores de características, tais como correspondência, recuperação e classificação de imagens. Para resolver esses problemas, pode-se aplicar algumas técnicas de redução de dimensionalidade, escencialmente, construindo uma matrix de projeção que explique adequadamente a importancia dos dados em outras bases. Esta dissertação visa aplicar técnicas de redução linear de dimensionalidade aos descritores SIFT e SURF. Seu principal objetivo é demonstrar que, mesmo com o risco de diminuir a precisão dos vetores de caraterísticas, a redução de dimensionalidade pode resultar em um equilíbrio adequado entre tempo computacional e recursos de armazenamento. A redução linear de dimensionalidade é realizada por meio de técnicas como projeções aleatórias (RP), análise de componentes principais (PCA), análise linear discriminante (LDA) e mínimos quadrados parciais (PLS), a fim de criar vetores de características de menor dimensão. Este trabalho avalia os vetores de características reduzidos em aplicações de correspondência e de recuperação de imagens. O tempo computacional e o uso de memória são medidos por comparações entre os vetores de características originais e reduzidos
Abstract: Robust local descriptors usually consist of high dimensional feature vectors to describe distinctive characteristics of images. The high dimensionality of a feature vector incurs into considerable costs in terms of computational time and storage requirements, which affects the performance of several tasks that employ feature vectors, such as matching, image retrieval and classification. To address these problems, it is possible to apply some dimensionality reduction techniques, by building a projection matrix which explains adequately the importance of the data in other basis. This dissertation aims at applying linear dimensionality reduction to SIFT and SURF descriptors. Its main objective is to demonstrate that, even risking to decrease the accuracy of the feature vectors, the dimensionality reduction can result in a satisfactory trade-off between computational time and storage. We perform the linear dimensionality reduction through Random Projections (RP), Independent Component Analysis (ICA), Principal Component Analysis (PCA), Linear Discriminant Analysis (LDA) and Partial Least Squares (PLS) in order to create lower dimensional feature vectors. This work evaluates such reduced feature vectors in a matching application, as well as their distinctiveness in an image retrieval application. The computational time and memory usage are then measured by comparing the original and the reduced feature vectors. OBSERVAÇÃONa segunda folha, do arquivo em anexo, o meu nome tem dois pequenos erros
Mestrado
Ciência da Computação
Mestre em Ciência da Computação
ARAÚJO, Rodrigo Barbosa de. "Biomimética e artefatos para ambientes aquáticos: estratégias de leveza e resistência inspiradas na estrutura celular do agave." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/18470.
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A biomimética visa o estudo das estratégias da natureza, tendo-a como princípio e inspiração para solução de problemas de design e outras áreas. Esta pesquisa é uma abordagem alternativa para processos de geração de soluções no design de estruturas de pranchas de surf. Atualmente os materiais e processos produtivos destes artefatos ainda estão distantes dos aspectos ecológicos e de um ciclo de vida de produto sustentável. Existem algumas alternativas, onde as pranchas são fabricadas com materiais orgânicos, como por exemplo, o Agave, porém ainda com processos ultrapassados, contrários às estratégias da natureza, que atuam num optimum de economia de matéria e energia, dentro de um ciclo de vida sustentável bem definido. Com base na metodologia DesignLens (Biomimicry Institute 3.8), os ensinamentos da natureza aliados à tecnologia representam potencial de inovação em design e sustentabilidade. Quando processos de design paramétrico foram incorporados à fabricação digital, se permitiu atingir um nível de materialização muito próximo das estratégias da natureza. Verificou-se que a aplicação de tecnologias digitais tem grande relevância para o futuro das áreas de projeto, principalmente quando alinhadas aos princípios de sistemas biológicos. Esta pesquisa obteve parte da validação através da impressão 3D de uma secção de uma prancha de surf como exemplo de aplicação, dentre muitas alternativas para as estratégias do Agave em estruturas.
Biomimetics aims study of the strategies of nature, having it as a principle and inspiration for design and troubleshooting other áreas. This research is an alternative approach to the processes of generation of solutions in the surfboards design. Currently the materials and production processes of these artifacts are still distant from ecological aspects and a sustainable product life cycle. There are some alternatives, where the boards are made with organic materials, as for example, Agave, but with outdated processes, contrary to nature, strategies that work in an optimum of economy of matter and energy, within a sustainable life cycle. Based on the DesignLens methodology (Biomimicry Institute 3.8), the teachings of nature coupled with technology represent potential for innovation in design and sustainability. When parametric design processes have been incorporated into the digital fabrication, if allowed to reach a level of materialization very close of the strategies of nature. The application of digital technologies has great relevance to the future of the project areas, especially when aligned to the principles of biological systems. This research obtained part of the validation through the 3D printing of a section of a surfboard as an example of application, among many alternatives for the strategies of Agave in structures.
Lopes, Rodrigo Aranha Pereira. "Computational strategies applied to product design." Master's thesis, Universidade de Lisboa, Faculdade de Arquitetura, 2018. http://hdl.handle.net/10400.5/17993.
Full textEm diferentes ocasiões, Richard Sennett e Vilém Flusser descreveram que a prática e a teoria, a técnica e a expressão, a arte e a tecnologia, o criador e o usuário, antes compartilhavam a mesma raíz. Ao longo da história, no entanto, estes conceitos se dividiram com o design posicionado ao centro. Esta proposta de pesquisa visa, em primeiro lugar, contribuir para a diminuição desta herdada separação. Isso, por meio do uso de estratégias computacionais aplicadas ao design. O presente estudo aplicará essa abordagem ao projeto e construção de uma prancha de surfe. Um dos objetivos é desenvolver uma plataforma de codesign que permita aos usuários gerarem suas próprias pranchas de surf, por meio de modelagem algorítmica / paramétrica (Grasshopper e ShapeDiver). Um segundo aspecto considera criticamente os materiais utilizados na indústria do surf, com o objetivo de desenvolver produtos que utilizem materiais menos nocivos ao meio ambiente e com maior capacidade de controle e alteração em relação às capacidades de desempenho. Em particular, esta proposta visa desenvolver um algoritmo para gerar objetos com seus núcleos internos compostos por estruturas de papel. O objeto específico a ser gerado neste caso é uma prancha de surf.
ABSTRACT: As pointed out on different occasions by both Richard Sennett and Villém Flusser, practice and theory, technique and expression, art and technology, maker and user, once shared a common ground. Throughout history, however, they have become divided. Design stands in between. This research proposal firstly aims to contribute to the diminishing of this historical inheritance. This, by means of providing a workflow for designers with the use of computational strategies. The present study will apply this approach to the design and building of a surfboard. The goal is to develop a co-designing platform allowing users to generate their own tailor-made surfboard by means of algorithmic/parametric modeling (Grasshopper and Shapediver). A second aspect critically considers the materials used in the surf industry, with the objective of developing products using materials that are less harmful to the environment and with a greater capacity of control and alteration with regards to performance capabilities. In particular, this proposal aims to develop an algorithm that can be used to generate objects of paper structures composing their inner core. The specific object to be generated in this case, is a surfboard.
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Kantharaju, Shreyas, and Jobin Varghese. "Design and Fabrication of Moulds using Additive Manufacturing for producing Silicone Rubber Products." Thesis, Högskolan i Halmstad, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-42281.
Full textZavalina, Viktoriia. "Identifikace objektů v obraze." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220364.
Full textMasse, Alain. "Lévitation diamagnétique sur micro-aimants : applications à la microfluidique digitale et à la biologie." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00951409.
Full textCaissard, Thomas. "Opérateur de Laplace–Beltrami discret sur les surfaces digitales." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1326/document.
Full textThe central issue of this thesis is the development of a discrete Laplace--Beltrami operator on digital surfaces. These surfaces come from the theory of discrete geometry, i.e. geometry that focuses on subsets of relative integers. We place ourselves here in a theoretical framework where digital surfaces are the result of an approximation, or discretization process, of an underlying smooth surface. This method makes it possible both to prove theorems of convergence of discrete quantities towards continuous quantities, but also, through numerical analyses, to experimentally confirm these results. For the discretization of the operator, we face two problems: on the one hand, our surface is only an approximation of the underlying continuous surface, and on the other hand, the trivial estimation of geometric quantities on the digital surface does not generally give us a good estimate of this quantity. We already have answers to the second problem: in recent years, many articles have focused on developing methods to approximate certain geometric quantities on digital surfaces (such as normals or curvature), methods that we will describe in this thesis. These new approximation techniques allow us to inject measurement information into the elements of our surface. We therefore use the estimation of normals to answer the first problem, which in fact allows us to accurately approximate the tangent plane at a point on the surface and, through an integration method, to overcome topological problems related to the discrete surface. We present a theoretical convergence result of the discretized new operator, then we illustrate its properties using a numerical analysis of it. We carry out a detailed comparison of the new operator with those in the literature adapted on digital surfaces, which allows, at least for convergence, to show that only our operator has this property. We also illustrate the operator via some of these applications such as its spectral decomposition or the mean curvature flow
DiLiberto, Stacey Lynn Barreto. "Remediation and the task of the translator in the digital age digitally translating Simone Schwarz-Bart's Pluie et vent sur T??lum??e Miracle." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4754.
Full textID: 030646272; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web; Thesis (Ph.D.)--University of Central Florida, 2011.; Includes bibliographical references (p. 189-202).
Ph.D.
Doctorate
English
Arts and Humanities
Texts and Technology
Kexel, Christoph. "La production et la gestion des connaissances dans le marketing des moteurs de recherche : une approche basée sur l'apprentissage par l'action." Nice, 2012. http://www.theses.fr/2012NICE0034.
Full textSince the late 1980s the development of the Internet has empowered customers to choose from an extensive range of products and suppliers and to make purchases more efficient and flexible (Chaffey et al, 2006). In online marketing the potential customer opens a communication channel to the marketer by seeking information with search engines ((Chaffey et al, 2006), (Bogner, 2006)), so that ‘being found’ represents the crucial success factor for today’s organizations. However, modern firms are surprisingly sluggish in appreciating the critical importance of online marketing (Schubring, 2008). This dissertation aims to design a methodology for improvement of marketers’ knowledge and online marketing skills. The dissertation initially develops an action learning based model for conveying the basic concepts necessary for marketing practitioners. This methodology is then applied and evaluated in a controlled higher education environment by also conveying the expertise to a control group in a traditional form. An analysis of the efficacy of the different knowledge-transfer methods is provided in order to identify the optimal learning approach. The data collected on assumed knowledge improvements illustrate that optimal results have indeed been obtained in all subcategories of Internet marketing by the proposed framework. The dissertation concludes that the methodology is indeed able to instill the compulsory know-how in order that practitioners may cope with and make use of the World Wide Web – despite its vagaries. The findings advance business practice by providing a possibility of effective on-the-job training for the key organizational function of online marketing. This may facilitate corporate learning models in a more general context
Carril, Rojas Jaime. "Estudio comparado de las Agendas digitales de los países del cono sur: Chile, Argentina y Uruguay, Un modelo de análisis de la política digital desde el concepto apropiación." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/123366.
Full textNowak, Florence. "Regional music goes digital : challenges of the Garhwali music industry (North India)." Paris, EHESS, 2015. http://www.theses.fr/2015EHES0668.
Full textThis is a study of the musical industry of Garhwal, a Himalayan area in North India. An important production labeled as "Garhwali music" or "Garhwal geet" and sung in the Garhwali dialect has been developing locally since the 1950s, firstly in the form of cassettes, then of compact discs and video clips. However, after an important upswing of the digital diffusion in the early 2000s, the production now seems to have entered a state of crisis. Concomitantly, the creation of the state of Uttarakhand (including the division of Garhwal) in 2001 triggered the implementation of a regional cultural policy, while the generalization of online music circulation challenged the economic model of this niche market. Through an ethnographic approach of the local industry, I wished to account for the factors that determine the dynamism and the difficulties of Garhwali muusic since the digital turn beyond a mere macro-economic explanation centered on "piracy". This anthropological analysis shed light on transversal issues that emerged directly from the field: notably, the ambiguous nature of a repertoire that is both a collective heritage and a cultural product; the interpersonal and social tensions that shape this environment; and the crucial role of migration patterns. By following such contemporary dilemmas faced by the actors of th entire production chain, I sought to draw the collective issues that regional popular music is facing today
Ramírez, Mellado Maximiliano. "Desarrollo e implementación de un sistema de detección automatica de publicidad en prensa escrita." Tesis, Universidad de Chile, 2014. http://www.repositorio.uchile.cl/handle/2250/116886.
Full textLa revisión sistemática de la prensa es una importante herramienta para el análisis de presencia de marcas y desarrollo de estrategias publicitarias, el monitoreo de estos medios tradicionalmente es realizado por operadores que manualmente extraen la información. Este trabajo tiene como objetivo presentar un novedoso sistema de detección automática de publicidad sobre imágenes procedentes de diarios y revistas, dentro del marco del proyecto IntelliMEDIA, llevado a cabo por el startup chileno CPDLabs. La metodología para detectar anuncios publicitarios se basa en un modelamiento específico de la estructura de la prensa escrita, permitiendo llegar a obtener una estimación del costo de los anuncios detectados. Para ello se separa el problema en 4 bloques: Preprocesamiento que separa el texto de las imágenes dentro de la página. Detección de logos que busca logos dentro de la página. Detección de publicidad que identifica el anuncio publicitario al que pertenece el logo y finalmente una etapa de tarificación que entrega una estimación del costo asociado al espacio publicitario. El problema es abordado principalmente mediante tres estrategias: Primero la representación de la imagen en descriptores locales, que permite calzar características similares entre imágenes. Segundo, la estrategia de detección de objetos Viola-Jones, algoritmo de machine learning que genera un clasificador en base a un conjunto de imágenes de entrenamiento. La última estrategia es comparar histogramas de color permitiendo integrar información de color a la clasificación. Para medir el desempeño de dichas estrategias se desarrolla un marco de evaluación, que consiste en una base de validación de 20.000 páginas de diario con 27 logos marcados, para así medir el desempeño de las distintas estrategias y configuraciones de parámetros, encontrar una solución eficaz para el problema y analizar las fortalezas y debilidades de los distintos métodos. Los resultados demuestran que la solución es viable y es posible detectar logos mediante descriptores locales y Viola-Jones, logrando desempeños mayores al 90%. Por lo tanto IntelliMediA puede llegar a ser una manera eficaz y eficiente de extraer información publicitaria automáticamente de prensa escrita.
Portes, Audrey. "La transparence numérique : rôle du client et conséquences sur la relation à la marque." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTD002/document.
Full textThe digital revolution is taking place in a climate of distrust. Consumers and citizens often have a negative judment of digital practices (collection and data exploitation, etc.). Officials are calling for more transparency to surpass the current trust crisis. But will this principle of transparency be enough to restore trust in the digital environment? The question of transparency arises significantly today because of the risks of customer drift and manipulation. It also arises because of the changing communication modes which are now multiform, multidirectional and instantaneous. This research explains the role of perceived transparency of digital practices in the way we apprehend the customer relationship. A qualitative exploratory study on two samples validated the multi-dimensionality of the perceived transparency construct (objectivity, clarity, openness) using the perceptions of 16 consumers and 12 managers. An online quantitative study (ad hoc panel of 445 respondents) conducted on the perceptions of Amazon customers, an e-commerce pure player, leader in the field and pioneer in the massive exploitation of data (recommendation engines , customization, etc.), has helped to 1) develop a measurement scale of perceived transparency, 2) understand how the customers’ digital transformation had a role in the perception of transparency and 3) determine the influence of perceived transparency’s dimensions on trust building and commitment. A qualitative post-survey study was finally conducted to discuss with managers the implications of this doctoral research
Aubry, Guillaume. "Microresonateurs optiques à etat liquide et microfluidique digitale : applications aux lasers à colorant en gouttes pour les laboratoires-sur-puce." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00664670.
Full textPierdon, Baptiste. "Regard communicationnel sur le sentiment de solitude à travers Internet : des nouvelles solitudes numériques à "l'être-seul-ensemble"." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCH041.
Full textHannah Arendt defines solitude according to three different modes, thefirst is called "Solitude" and covers the situations in which we are with ourselves.In philosophy, this ontological dichotomy allows man to become self-conscious,and to dialogue with himself. Solitude allows the formation of thought. Thesecond mode defined by aren't is called the horror. This mode is illustrated by thefact that one can feel very alone in the midst of a crowd. Finally, the last modeexposed by the philosopher corresponds to what it specifies isolated. This modeappears when the person is concerned with the things of the world. This mode hasa political aspect. The person finds himself isolated when the others (with whomshe shares the same concern of the world) turn away from her. From the analysisgiven by Arendt we will put in parallel this distinction of forms of solitudes withour digital overexposure and our profusion of digital relations in our society.The Internet has become, in our life, in a very short time a part ofourselves. Every day we go to the virtual world for different reasons. We want toshare with our real friends our emotions, our experiences, our memories on socialnetworks like Facebook or Twitter. We search for "bargains", shop, go to virtualforums to "chat", use online messaging to continue interrupted conversationsearlier, or maintain a connection with a loved one find distant. Some people usethe Internet to meet people, to make friends, to live a normal and real life in thevirtual world. The question of loneliness has never been more present than it istoday, the fault of our individualistic society that undoes the bonds betweenpeople. It is in this context that the Internet appears a little like a savior. TheInternet offers the opportunity to bring people together, to create new socialrelationships, to create friendships, to give people who feel lonely out of solitude.But does the Internet really solve the problem of loneliness? Does itfundamentally change the relationship that individuals will have with each otherin the future? What impact on the real and / or virtual social relationships thatindividuals have?
Yoo, Hyun-Joo. "Text, Hypertext, Hypermedia : ästhetische Möglichkeiten der digitalen Literatur mittels Intertextualität, Interaktivität und Intermedialität /." Würzburg Königshausen & Neumann, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2917304&prov=M&dok_var=1&dok_ext=htm.
Full textMuñiz, Calderón Rut. "ANÁLISIS CONTRASTIVO DE LAS VARIACIONES LINGÜÍSTICAS Y CULTURALES EN LA COMUNICACIÓN DIGITAL ENTRE HABLANTES NO NATIVOS." Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/14573.
Full textMuñiz Calderón, R. (2011). ANÁLISIS CONTRASTIVO DE LAS VARIACIONES LINGÜÍSTICAS Y CULTURALES EN LA COMUNICACIÓN DIGITAL ENTRE HABLANTES NO NATIVOS [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/14573
Palancia
Ortiz, Sosa Joel. "Design of a digital baseband transceiver for wireless network-on-chip architectures." Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S081.
Full textMassive parallelism in emerging high-performance computing (HPC) applications requires the use of manycore architectures relying on an efficient on-chip interconnection system. Wireless Network-on-Chip (WiNoC) offers a promising solution for interconnection architectures, mainly providing efficient communication links and supporting natural broadcast/multicast communicatioAn. This thesis focuses on the physical layer of WiNoC, particularly on the design of a digital transceiver capable of providing the best trade-off between performance and energy efficiency. In order to design the most appropriate digital transceiver, we first study the channel degradation carried out by common parasitic phenomena belonging to any wireless channel, contrasting with the ideal channel models used by most of the WiNoC research papers. Subsequently, we propose a first solution capable of providing channel interference resilience, while offering multiple channel access. This design is later enhanced to be able to adapt to the existing NoC traffic patterns. Then, in order to provide a high speed communication without a significant compromise in energy, a high-speed transceiver based on a multi-carrier architecture is proposed, overcoming the limitations of conventional single-carrier WiNoC transceivers. Finally, a network simulator is developed to calculate the percentage of wireless link utilization according to the wireless interface configuration and placement. This simulator further computes the dynamic energy consumed by an electrical NoC compared with a WiNoC using multiple wireless interfaces
Frank, Florian. "Hybrid analogue & digital access network architectures for the mobile/fixe infrastructure convergence." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00665650.
Full textGhallabi, Farouk. "Precise self-localization of autonomous vehicles using lidar sensors and highly accurate digital maps on highway roads." Thesis, Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLM028.
Full textIn this thesis, we address the problem of accurate localization of autonomous vehicles on highway roads using LiDAR sensors and a highly accurate third party map. The proposed approach is based on two core modules: perception and map-matching. The perception module uses the 3D data enhanced by the LiDAR reflectivity to detect road primitive features: lane markings, barriers, traffic signs and guardrail reflectors. The map-matching module incorporates these measurements and aligns them against a highly accurate third party map. The map-matching is performed using a particle filter, which we have improved in order to deal with the particle deprivation problem. The proposed improvement uses the road geometry in order to optimize the spatial distribution of particles while maintaining the number of particles constant. To evaluate the proposed method, we compared the localization outputs of our system to a Global Navigation Satellite System (GNSS) with RTK corrections (ground truth). Experiments have been conducted on two highway roads. The first is an experimental test track (CTA2) of 5 km long located at CTA, Renault’s Aubevoye’s Technical Center. This track is designed to exactly replicate a two-lane highway environment. The second is a section of the A13 highway, running from Paris and ending at Aubevoye. The results are promising and show the feasibility of a localization system based on LiDARs alone and with a sparse map data representation
El, hadbi Assia. "Time-to-Digital Conversion based on a Self-Timed Ring Oscillator." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT071.
Full textTime-to-digital converters (TDCs) have become unavoidable in systems incorporatinghigh precision time measurements. They are used in many application fields such ashigh-energy physics, metrology, telecommunications and satellite positioning. Fully digital approaches are today adopted to benefit from low-power and small circuit area. This thesis proposes a new TDC architecture based on a Self-Timed Ring (STR) oscillator, which is able to provide a very high resolution without averaging. Indeed, the proposed TDC virtually achieves a time resolution as fine as desired by simply increasing the STR oscillator number of stages. In fact, the STR is a multi-phase oscillator, which is able to provide one phase per stage output. The TDC exploits these different STR phases, which are evenly-spaced thanks to the uniqueanalog STR properties. Thus, a regular time base can be extracted from this STR oscillator and applied for time measurement. This thesis demonstrates the advantages of such a TDC in terms of precision, calibration, low-cost and for on-the-fly measurements. It also states the TDC limits due to the STR jitter. After a first implementation on an FPGA, an ASIC prototype has been designed, fabricated and tested for validating this new class of TDC
Andriuzzi, Andria. "La conversation de marque à la lumière de la théorie du face-work : impact de la stratégie d’interaction des marques sur l’attitude des internautes." Thesis, Paris 1, 2017. http://www.theses.fr/2017PA01E011.
Full textBrand-consumers interaction is an emerging topic in marketing research especially since the advent of social media. This research focuses on a little-studied type of interaction, brand conversation. Brand conversation is defined as a series of messages exchanged online and in public between several individuals, at least one of them being a brand representative. To study this phenomenon, we carry out two qualitative studies and three quantitative studies. Using face-work theory, we show that brands seem to be more human by following interpersonal communication rules. However, these rules are slightly altered in a marketing context, especially when the conversation is about products and when consumers are attached to the brand. This research contributes to the literature on brand-consumer interaction and to the literature on brand anthropomorphism by showing the impact of brand conversational practices on consumer attitudes
Kauffmann, Paul. "Lévitation diamagnétique sur micro-aimants : applications à la microfluidique digitale et à la biologie." Grenoble INPG, 2009. http://www.theses.fr/2009INPG0113.
Full textDiamagnetic levitation is one of the rare way to compensate action of gravity. This kind of repulsion is negligible at our scale. However, at microscale, this effect becomes significant and can achieve levitation of diamagnetic objects. Through the development of micromagnets, analytical and numerical models, and experiments, applications of diamagnetic levitation of microdroplets and trapping of cells in paramagnetic media is explored. It is shown that diamagnetic levitation allows quantifying interactions between levitating charged droplets. The behaviour of cells trapped in paramagnetic medium is also analysed. This study opens attractive alternatives to cells sorting, based on size, magnetic susceptibilities and endocytoticity. Finally, remote handling of levitating droplets is proposed and simulated by coupling diamagnetic levitation and dielectrophoresis
Papinot, Emmanuelle. "Recherche de vidéos académiques dans les collections en ligne : approche ergonomique." Thesis, Toulouse 2, 2018. http://www.theses.fr/2018TOU20081.
Full textMore and more online environments dedicated to the dissemination of academic knowledge are integrating videos into their multimedia corpus. Compared to static or animated text or graphics, video usability has not yet been the object of scientific studies in psychology and cognitive ergonomics. Video search is part of the information seeking process. The theoretical framework of this dissertation is the Information Foraging theory (Pirolli & Card, 1999), which describes information seeking in a stochastic environment, based on a search built on intermediary information. Our main goal is to provide knowledge about users, with the initial hypothesis that a variety of video-seeking goals can coexist among users. This knowledge can help improve the usability of online environments.An exploratory study using a multi-methodological approach was carried out on the usability of an audiovisual online platform for higher education and research and on a multimedia virtual museum dedicated to the history of crime justice and punishments. The results show that: (a) the difficulties related to online video publishing directly impact video search on the user side, (b) it is relevant to distinguish the video as a media from the audiovisual document. The characteristic common to both platforms is that a majority of users use the platform as a way to educate themselves, which directly questions the interest and use of video as a vehicle of knowledge acquisition for specific purposes
Solari, Landa Melina Marianella. "Impact de la disponibilité permanente des équipements numériques personnels sur la représentation que les élèves se construisent de la forme scolaire. Deux cas d’étude en collège et en lycée." Thesis, Poitiers, 2017. http://www.theses.fr/2017POIT5003/document.
Full textThis research is situated in the context of educational institution projects that equip students with personal digital devices. It aims to explain how the permanent availability of personal digital devices (tablet, personal computer, mobile) changes the social representation students have of school as an institution, or the so-called “schooling form”. Two case studies at secondary-level education are analysed with an empirical approach: students participating in the TED project in Saône-et-Loire and students of the Living Cloud project at the Lycée Pilote Innovant International (LPII) in Jaunay-Marigny. In order to build the theoretical framework to analyse the schooling form concept, this study first determines 4 dimensions based on the literature available. Subsequently, it analyses the representation changes within these 4 dimensions of the relationship to the schooling form: knowledge, authority, space-time and evaluation. Finally, the present dissertation draws on the concept of instrumental mediation and cultural interactions in order to identify the interaction categories that are mobilized in the instrumentation performed by students during the use of personal digital devices at school. Students were questioned by two means: an online survey and collective interviews. The online survey results allowed us to identify the representation students have about two space-time frameworks: school and house. Results were analysed in terms of correlations (Kendall's Tau) and by the test of independence (Chi-square). Through the use of the Principal Component Analysis (PCA), the survey results allowed to determine 8 students' profiles regarding schooling and to associate them to each student. Using a Factorial Analysis of Multiple Correspondences (FAMC), these profiles were associated to students' positioning regarding the use of personal digital equipment and the 4 schooling form dimensions. Results obtained by means of collective interviews were analysed by thematic and conceptualising categories. Finally, the data corpus was studied in terms of the instrumental mediation incidence on cultural interactions. The main results of this investigation show the impact of digital schooling and the differences between how adults perceive the students' schooling form and the students' own representation of it. Furthermore, this study points to the changes in the student's representation of space-time, mainly in what regards the student's presence and attention in school. Contrary to previous research findings, this study shows that the teacher as a figure of legitiate knowledge and authority remains stable in students' representations, as well as the importance of evaluation in the schooling form representation. However, the representation of the availability of information and the access to information are transformed. Horizontality in the teacher-student relationship, often attributed to the use of digital devices, is questioned by the present study. Moreover, results underline the importance of considering the affective and relational components in the process of digital integration at school as well as the role of students' social origins and cultural practices. Finally, this study analyses the tensions between the main guidelines in digital integration projects and the traditional schooling form
La presente investigación se enmarca en el contexto de la integración de las tecnologías digitales en la Escuela, a través del equipamiento personal de los alumnos. Ésta tiene como objetivo conocer cómo la disponibilidad permanente de tabletas, computadores portátiles y teléfonos celulares, modifica la representación de los alumnos acerca de la forma escolar. Para ello, se analizaron empíricamente dos casos: los estudiantes de los colegios participantes del proyecto TED en Saône-et-Loire y los alumnos de liceo que forman parte del proyecto Living Cloud del Lycée pilote innovant international (LPII) de Jaunay-Marigny. En un primer momento, con base en la revisión de la literatura, se determinaron cuatro dimensiones de la relación a la forma escolar: saber, autoridad, espacio-tiempo y evaluación. Estas dimensiones constituyen el marco de análisis de las modificaciones a la representación de la forma escolar de los estudiantes. Finalmente, el estudio se apoya en las teorías de la mediación instrumental y de las interacciones culturales con el objetivo de identificar las categorías movilizadas en la instrumentación que los alumnos hacen de los equipos digitales en la Escuela. Para la realización de esta investigación, los alumnos fueron interrogados de dos maneras: un cuestionario en línea y entrevistas colectivas de explicitación. Los resultados obtenidos del cuestionario permitieron identificar la representación que tienen los alumnos de dos espacios-tiempo: escuela y casa. Estos resultados fueron analizados a través de correlaciones (tau de Kendall) y el test de independencia de variables (chi-cuadrada). Mediante un análisis de componentes principales (ACP), los resultados determinaron ocho perfiles de alumnos en relación a la forma escolar. Estos perfiles fueron atribuidos a cada uno de los alumnos estudiados. De igual forma, a través de un análisis factorial de correspondencias múltiples (AFCM), los perfiles fueron asociados al posicionamiento de los alumnos en relación al uso de equipos digital y las cuatro dimensiones de la forma escolar. Los resultados obtenidos en las entrevistas colectivas fueron analizados usando categorías temáticas y “conceptualizantes”. Finalmente, la totalidad de los resultados fueron estudiados en términos de la incidencia de la mediación instrumental sobre las interacciones culturales. Los resultados principales de este estudio muestran el impacto de someter el equipamiento digital al proceso de escolarización. Se observan las diferencias de percepción que tienen los adultos de la representación de los alumnos sobre la Escuela y la representación que tienen los propios alumnos sobre ella. Se muestra también la modificación de la representación de la relación al espacio-tiempo, sobre todo en lo que se refiere a la presencia y la atención de los alumnos en la Escuela. Contrariamente a las ideas generalizadas, el maestro como figura del saber legítimo y de autoridad, permanece estable en la representación de los alumnos, al igual que la importancia de la evaluación en la representación de la Escuela. Sin embargo, se observa una transformación en la representación de la disponibilidad y el acceso a la información. La horizontalidad de la relación maestro-alumno, frecuentemente atribuida a la utilización del equipamiento digital, es cuestionada por el presente análisis. También se plantea la importancia de los componentes afectivos y relacionales, así como el rol del origen social de los alumnos y sus prácticas culturales en la integración de lo digital en la Escuela. Para finalizar, esta investigación analiza las tensiones entre los actuales lineamientos de los proyectos de integración digital en la institución escolar y la forma escolar tradicional
Georgelin, Philippe. "Vérification formelle de systèmes digitaux synchrones, basée sur la simulation symbolique." Université Joseph Fourier (Grenoble ; 1971-2015), 2001. http://www.theses.fr/2001GRE10126.
Full textKouadio, Pémon. "Réception des communications médiatiques persuasives : influences non conscientes de la publicité digitale sur le comportement." Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0424.
Full textRecent theoretical models in the field of persuasive communication and media effects, argue that perceived and forgotten messages can be stored in a type of memory called the implicit or non-conscious memory. People use this kind of memory to form judgments and behaviors without being able to validly indicate the true determinants. Little research has been done in the field of information and communication sciences to understand reception processes and the "unconscious" effects of such messages. Depending on their semiotic content (image or word), how are they received, processed, memorized and used as a basis for future behavior? In a paradigm of information processing and implicit cognition, we used a mixed methodology to answer the problem of processes explaining the effects of quickly seen and rapidly forgotten advertisements on the actual behavior of Internet users
Renaudin, Alan. "Réalisation d'une plate-forme à ondes acoustiques de surface pour une microfluidique digitale dédiée à la biologie." Lille 1, 2006. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2006/50376_2006_190.pdf.
Full textJacomino, Mireille David René Courtois Bernard. "Sur la théorie du test des circuits digitaux mesures de la confiance /." S.l. : Université Grenoble 1, 2008. http://tel.archives-ouvertes.fr/tel-00332734.
Full textZattoni, Olivier. "Cyberespace et paysage : regards croisés sur la ville et les environnements digitaux." Thesis, Nice, 2014. http://www.theses.fr/2014NICE2041/document.
Full textThis research focuses on symbolic, artistic and representational issues linked to Web and connected systems, such as mobile phones and tablets. Because the screen, i.e. the monitor, is now considered in its mobility, it has to be perceived as a window opened toward the outside. However, the monitor also sketches a lanscape where cyberespace, beyond its logical nature, has to be combined with a reality that aftermath becomes fragmented and recomposed. This applies to the steps we spread while walking in the street, soon transcribed in data on our smartphone : from a simple walk to a track that edges into the city. In this context, city becomes a kind of text and digital artefacts participate to its rewriting, juxtaposing new maps. As city represents the fragmented and the multiple, cyberspace implies a vision of urbanity where man merges himself with technology in a specific way: virtual worlds, along with videogames, science-fiction litterature and movies bring us back to the cyberpunk movement, and before, with the ’shock’ of cities experienced during the modernity by Georg Simmel and Walter Benjamin. This chaos of senses, space and time which defines modern cities is also typical of a technological power that tends to lead the society. Far from orwellian visions, the current advanded technology, although it appears crossed by political, technological and social matters, has to be situated in the context of cybersensbility. Actually in this era of networks and mature technology stands a new vision of technology that implies new practices, new attempts, and makes the cybersensibility concept tangible, as it is opposed to a passive conception in the use of technologies
Jacomino, Mireille. "Sur la théorie du test des circuits digitaux : mesures de la confiance." Grenoble INPG, 1989. http://tel.archives-ouvertes.fr/tel-00332734.
Full textMaouchi, Djamel. "Comportement des sols compactés sur quelques chemins à pression négative controlée." Châtenay-Malabry, Ecole centrale de Paris, 1998. http://www.theses.fr/1998ECAP0593.
Full textRenaudot, Raphaël. "Conception, fabrication de puces microfluidiques à géométrie programmable et reconfigurable reposant sur les principes d’électromouillage sur diélectrique et de diélectrophorèse liquide." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENY080/document.
Full textIn the field of lab-on-a-chip (LOC) systems, the channel geometry of a microfluidic chip is often specific to perform a given protocol. The chip geometry is hence defined at the design step, before the fabrication steps (generally time consuming and expensive) and cannot be thereafter modified. This fact becomes an issue when the geometry does not fit satisfactorily to the specifications and a new batch of fabrication has to be started, to size afresh the microfluidic chip. To overcome this inconvenient we propose to develop a new generation of microfluidic chips with a programmable and reconfigurable geometry. This concept is widely based on both digital microfluidic techniques, the electrowetting on dielectrics (EWOD) and the liquid dielectrophoresis (LDEP) actuations. The first investigation is focused on the microfluidic technique LDEP. First, an electromechanical model for liquids behaviours during a EWOD or LDEP actuation is established. This model is then used as a basis for the LDEP patterns design and fabrication. The LDEP patterns are tested to identify the geometries and dielectric layers stacks which give optimized LDEP actuations. By taking into account a broad parameters range, the study shows that, within a precise setup and specific conditions, the LDEP actuations can have equal performances at the minimum, or better performances than those reported in the overall scientific literature until now. Finally, a surface functionalization protocol by polymer spots (diameter size ranging from a few microns to several dozens of microns) utilizing the LDEP technology is described. This method is likely to compete directly with the standard functionalization tools. The second investigation is dealing with the programmable and reconfigurable geometry concept, thanks to microfluidic platforms which get together both EWOD and LDEP technologies on a same component. Firstly, the microfluidic platform in a single plate configuration allows providing master molds with a programmable geometry for the PDMS microfluidic chip fabrication. The results about this promising study lead to the processing of complex channels geometries, typically used in the microfluidic field. Secondly, the more exciting results are exposed about the programmable and reconfigurable microfluidic concept, by using advantageously the paraffin material. A specific protocol which takes advantages of LDEP and EWOD liquids displacements produces a lot of various and different microfluidic chips with complex channels shapes. For both applications, a single generic microfluidic platform can generate a wide number of different geometries, which can be modified partially or totally thereafter. The obtained results open up novel and promising work prospects, which one of them are approached on the fringe of the initial purposes. The first one belongs to the continuity of the programmable and reconfigurable by suggesting a low cost technology based on flexible Kapton substrate and inkjet printing of silver nanoparticules. The second one investigates the technologies compatibility between MEMS/NEMS resonating structures and LDEP metal structures (in polysilicon) at the submicronic scale
Lahna, Leila. "Amélioration de l’expérience d’achat en ligne et de la satisfaction client par le recours au nudge." Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPASI003.
Full textThe purpose of this research is to study the influence of nudges on the online shopping experience as well as on the satisfaction that results from it. A shopping experience can include many decision-making situations that lead the consumer to take control and participate in the co-production of their own journey. However, many studies have shown that consumers do not always make decisions that are in their best interests. Consumers can therefore affect their shopping experience and the resulting satisfaction. To accompany consumers and guide them towards certain options, rather than others, in their interest, we have mobilized the nudge. To understand the influence of this tool, we exposed each of the three samples of independent participants to one of three versions of the online shopping experience, depending on whether it is:- Without any nudge applied- With nudges built from a single heuristic,- With nudges built from several heuristics.To characterize the three versions of the consumer experience, we evaluated for each of them:- The dimensions mobilized in the context of the form of self-production participation tested: the cognitive, temporal, hedonic-sensory and praxeological dimensions,- As well as the resulting level of customer satisfaction.Analyzing respondents’ feedback based on the above indicators then enabled us, to understand the effect of nudge on the online shopping experience
Molnàr, Margit. "Tourner la page : autour de la matérialité de l'objet de lecture : observations sémiotiques, perspectives pédagogiques." Thesis, Toulouse 2, 2014. http://www.theses.fr/2014TOU20058/document.
Full textWhat could this title hide? Or reveal instead? It insinuates a certain tendency to a play on words. It hints at style. “Turn the page” since it’s about books, about reading practice. “Turn the page” because the days of books seem numbered, to believe certain prognostication to which this work does not address. However, there are new, digital pages. "About the materiality", since the paper page of the codex is turning literally around a material axis, sewn, stapled or glued. “Materiality", it is as an intrinsic quality of the book object which defines the products of writing. “Reading object,” it means different objects of reading, traditionally represented by printed books. While, now, it is possible to read technological objects too. “Object” once more, for the semio-pragmatic approach that desires to emphasize the material aspect of reading practice versus its linguistic aspect. “Observations,” it specifies and qualifies the approximate tenor of what is said and how it is said. “Semiotics,” it is the definition of the method and of the point of view under which these objects are investigated. “Pedagogical perspectives”, it is to refer to the field from which this study took its inspiration. Also, towards that it returns hoping to create bridges between several disciplines. This summary is a kind of explanation of the title, also intends to indicate the way of the reflection that develops the relationship of man to the written word that is based on the materiality
Song, Yang. "Evaluation de l'apport simultané des coutures sur la perméabilité des préformes cousues et sur les performances mécaniques des structures composites cousues." Thesis, Compiègne, 2015. http://www.theses.fr/2015COMP2250/document.
Full text3D composite materials, which obtained by stitching or tufting, have many advantages compared to the 3D orthogonal weaves or interlocks. ln order to evaluate the potential of this new generation of 3D materials, some studies have been devoted to their mechanical properties. Other studies have focused on the influence of certain types of seams on the permeability of materials such as NCF (Non Crimp Fabrics).This thesis is to study the contribution of seams through the thickness of reinforcement 2D classic fabrics. This contribution is evaluated the mechanical properties and their permeability at the same time. Among many stitching parameters, the study focused on the influence of the stitching density. Three different seams densities were carried out through a robot available in our laboratory.ln terms of permeability, the stitched preforms were laminated those of identical unstitched preforms by using Tufting.The evaluation of permeability was conducted in an unsaturated regime through a small scale bench test by the unidirectional flow. With this method, the in-plane permeability tensor is obtained through the measured permeability in three directions : 0° (warp), 90° (weft) and 45°. The results show that the type of Tufting seams reduces the effect of anisotropy ratio Kl/K2. And it is obvious that the position of the stitching thread causes local permeability gradients very pronouncedly between the heart and the surface of the preform. For the purposes of the mechanical properties, six composite plates were made by the RTM process. To achieve mechanical properties through the thickness of the plates of 20 mm thick, stitched and unstitched performed were prepared. DIC (Digital Image Correlation) was used to detect the distribution of displacement fields during mechanical testing (tensile, compression and short bearn bending) in order to take account of the presence of seams within materials. The measured mechanical performance proved below expectations, particularly with regard to the characteristics in the third direction. Micrographie analysis of materials revealed the presence of porosity concentrated within, or near the seams. Moreover, the bends or kinks of seams were caused by compaction during closure of the RTM mold. By connecting with the permeability data, it appears that the presence of porosities in the seams is a consequence ofpermeability gradients that induce impregnation flow reclosing
Gras, Renaud. "Identification de champs de propriétés élastiques fondée sur la mesure de champs : application sur un composite tissé 3D." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00845752.
Full textGalopin, Élisabeth. "Adressage par microfluidique digitale : application à la détection de marqueurs biologiques par plasmon de surface et détection intégrée." Lille 1, 2007. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2007/50376-2007-223.pdf.
Full textCailleau, Isabelle. "Récit d'une enquête sur l'écriture numérique collaborative synchrone." Thesis, Compiègne, 2015. http://www.theses.fr/2015COMP2185.
Full textFor the first time in the history of writing, several people can edit the same document at the same time and from a distance. This new writing practice, made possible by digital technology, is called synchronous collaborative digital writing. The question posed by this research is how a consistent and readable text can emerge from such systems. In addition, the texts that result from these practices can hardly be reduced to communication intentions that pre-exist "in the head" of the participants. The text emerges within the situations. This raises the methodological question of how to account for this emergence. This thesis therefore offers to explore a way to tackle it: a pragmatist type of investigation, and more specifically, a transactional approach. It is characterized by the need to think the relationship in its constitutive dimension without presupposing any of the entities prior to their entry in situation. It also implies that all of the descriptions of a given situation always have to be considered as provisional and subject to revision. Here, an operationalization of this philosophical approach is proposed in the field of Information and Communication Sciences. It is implemented for two categories of case studies: situations of production of argumentation in an educational context and situations of collaborative production of meeting reports. This experimentation makes it possible to conclude that it would be interesting to continue this investigation in a transactional approach and it outlines an analysis model to facilitate this pursuit
Damasceno, Cruz Kelly Kalynka. "L'amour complexe : pour une éthique de la reliance à l'ère digitale." Thesis, Paris, EHESS, 2020. http://www.theses.fr/2020EHES0042.
Full textThis research is dedicated to the systemic analysis of modes of sociability in cyberspace, especially in cases where the massive presence of actors around specific issues is identified. Once the groups of individuals are classified, we isolate two types: haters and neo-haters. Figures that will be observed throughout the work since its voluntary manifestation on the web. From those two figures, we will investigate the common understanding of ethics, evolutionary love and complex thinking, a triad of concepts fundamental to the understanding of notions such as reasonableness, ingrained beliefs and bubble filters in digital social networks. We conclude that complex thinking and complex love - the first according to Morin and the second, according to Peirce - can favor reliance in the digital age, fostering summum bonum
Esta pesquisa está dedicada à análise sistêmica das formas de sociabilidade no ciberespaço, especialmente, aos casos em que é identificada a presença massiva de atores ao redor de assuntos específicos. Uma vez classificados os grupos de indivíduos, isolamos dois tipos — haters e neo-haters, figuras que serão observadas ao longo do trabalho desde sua manifestação voluntária na web. A partir daquelas duas figuras, investigaremos o entendimento comum sobre ética, amor evolucionário e pensamento complexo, tríade de conceitos fundamental para o entendimento de noções como razoabilidade, crenças arraigadas e filtros bolha nas redes sociais digitais. Concluímos que o pensamento e o amor complexos - o primeiro segundo Morin e o segundo de acordo com Peirce - podem favorecer a reliance na era digital, fomentando o summum bonum
Cosseron, Kévin. "Identification des chargements exercés par un pneumatique sur une roue d'aéronef." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN036.
Full textThe predictive character of numerical simulations run to design a structure critically depends on the accuracy with which the boundary conditions prescribedon the structure are introduced. For aircraft wheel manufacturers, the loadings applied to the wheel during ground maneuvering by various tires that are mounted play an important role. However, they are hardly known apart from the resultant force between the ground and the tire. Aircraft wheel manufacturers do not control the tire, which is a complex intermediate component, but must still work with it to design their products. Because tire-ground loads are transmitted to the wheel through the tire at the tire-rim interface, assumptions on the deformation behavior of the tire are to be made to determine the correct applied loading to the wheel and many experiments are often requiredto evaluate the wheel structural response. The knowledge of tire-rim interface loadings would thus provide an invaluable help to shorten aircraft wheel design processes. To tackle this challenge, an inverse identification procedure of tire-rim loadings for several cases is proposed herein. The aim is to identify the loadings applied by a tire on an aircraft wheel via the measurement of thewheel deformation and to allow the wheel manufacturer to better understand and model the interaction between the wheel and the tire. First, an objective parameterization of tire-rim loadings, which is as robust and compact as possible, is defined. Then, non-intrusive measurements (e.g., displacement fields obtained by Digital Image Correlation analyses, strains at gauge locations) obtained during a previous postdoctoral research are used to calibrate the loading parameters. A finite element model updating algorithmis used to solve this inverse problem. Last, the optimal sensor placement problem is considered to define an instrumentation that yields the most accurate estimâtes of the loading parameters
Barredo, Escribano Maria. "La construction de l'identité sur Internet : mutations et transformations dans le web social." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0081.
Full textOn the basis of this analysis, we propose to take into consideration the digital identity as a complex process of construction, which may be regarded from several angles. In a constant mutation, a variety of stakeholders present in the Internet perform different roles in the on line individual's construction identity. On the one hand, an emergence of social web converts the user, in the form of a social media profile, into a multi-positional actor ( sender, transmitter, receiver, etc.) and gives him/her a relational identity as well. On the other hand, the constraints imposed by the net and the issues placed in different levels of analysis may suggest to review the horizontal hierarchy between nodes, being these ones the web's minimal units which in turn are embodied by the users. Therefore, could a node be social ? The digital interactive communication could it be based in presumptions excluding the individual ? Beyond the relational identity of social web, could it be conceived a digital identity equivalent to the real identity of an individual on any society? Conditions, premises and the confluence of different digital praxis are indeed the elements to be analysed in order to find suitable answers to our general problem. Certainly, the criteria to take into consideration a concept such an identity, and the preservation of user's real identity as a citizen are the main axis of our analysis. More precisely, an analysis which is focused in the current state of contemporary Internet regarding the individual, as we conceive him nowadays
Nguyen, The Quyen. "Mise au point d'un nouveau type de spectromètre Raman basé sur l'utilisation d'un DMD, à vocation industrielle." Châtenay-Malabry, Ecole centrale de Paris, 2007. http://www.theses.fr/2007ECAP1031.
Full textIn this work, the feasibility of combining the use of a DMD aslight modulator and a photomultiplier tube as detector in a Raman spectrometer has been demonstrated. New in conception and simple in configuration, such instruments should have production costs comsiderably lower than for traditional instrumetnts since both DMD and PTM are not expensive. With our prototype, a qualitative identification takes 1 second per product for qualitative analys and an analytical precision of -3% error can be otained in 5-6 seconds for one sample analysis, even in the present of fluorescence in samle. Thus various industrial applications become possible due to the short recording time combined with the possibilities of remot in situ measurements using optical fibers. Two methods of quantitative analysis have been proposed, "Backward stepwise selection of Peaks Intensities" (BssPI) et "Sumof Characteristic Peaks of a Component". Robust when faced to industrial conditions, they appear to be most appropriate for our analysis using ourDMD/PMT Raman spectrometer with low number of measurements and acceptable error of prediction. These two methods are pressently being used on our DMD/PMT Raman spectrometer
Larguier, Laurent. "Analyse de l'impact du bruit de commutation sur les blocs digitaux des circuits intégrés CMOS." Montpellier 2, 2008. http://www.theses.fr/2008MON20191.
Full textBenbahia, Ilham. "L'influence de la digitalisation d'un magasin sur l'expérience vécue et le comportement des clients." Thesis, Paris 1, 2020. http://www.theses.fr/2020PA01E002.
Full textIn this thesis we study the impact of the shopping experience on consumer behavior in a physical store context offering digital devices to its customers. We thus seek to measure the added value ofthe use of digital devices on the experience lived in store and on the consumer’s behavior. We alsotest the moderating role of the individual variables which are the need to touch (Need For Touch) and the optimal level of stimulation (Optimal Level of Stimulation) on the link between the degreeof use of digital devices and the lived experience. After carrying out a literature review on our keyconcepts, we conducted three successive studies: a qualitative study with managers, then two quantitative studies conducted in store with customers. Research has shown a positive impact of the degree of use of in-store digital devices on consumer experience and behavior. The moderating effect of the optimal level of stimulation has been validated ; that of the need for touch has beenpartially
Nyebe, Atangana Sandrine. "Effets des usages des ordinateurs XO sur les pratiques pédagogiques à l'école primaire au Cameroun : Cas de l'école publique d'application d'Angale." Thesis, CY Cergy Paris Université, 2020. http://www.theses.fr/2020CYUN1079.
Full textThe use of computers is effective in Cameroon primary schools for about two decades. These uses are limited in most cases to an introduction to the computer literacy through course or educational technologies, but especially to administrative management. However, in several primary schools in six out of the ten country’s regions, computers have moved beyond the stage of computer room or department to classrooms through mobile class modality. Their uses are effective whatever the subject content of the teaching-learning activity. This was made possible thanks to the partnership between Islamic Bank of Development and the Ministry of Basic Education through PAQUEB (Basic Education Quality Improvement Project). This research is concerned with the analysis of teaching activity at level two and three, respectively in class 4 and class 5.We are talking about describing practices in order to discern the impacts of XO computers on the user’s pedagogical practices. To do this, we observed classroom activity, resource design activity and document analysis. In addition, semi-structured interviews were conducted with teachers as well as reflective interviews after lessons in order to understand how they plan and organize their activity and its aim. This collection of data starts from the observation of two situations in order to compare them: reference activity and instrumented activity by technological artifacts. We also conduct semi-structured interviews with the school management to understand how it organizes the appropriation process and actual use of these artifacts by subjects within the institution. In addition, a semi-structured interview was conducted with a heterogeneous group of students per observed class.Finally, we analyze the digital traces and resources available on the platform. It is about identifying and understanding through real activity analysis, how XO pedagogical uses make evolve subject’s activity in situation, and for which added values? Three complementary theoretical frameworks are provided for this purpose. They are all bound by their interest in the analysis of the teaching activity as well as the instruments mobilized and developed to facilitate this activity. It is the instrumental approach, ergonomic psychology and professional didactics. The analysis of the data makes it possible to realize that a real collaborative dynamic work was set up in a natural way with the integration of XO in teaching practices. In addition, the use of technological artifacts in this educational activity positively improves aspects such as: scripting, resource design or task execution procedures
Gras, Stéphan-Eloïse. "L'écoute en ligne. Figures du sujet écoutant et mutations des espaces musicaux sur Internet." Thesis, Paris 4, 2014. http://www.theses.fr/2014PA040210.
Full textThis research questions the figures of the listening subject in the context of the transformations of musical spaces on the Internet from 2007-2014, in order to consider the question of online listening from the perspective of the fields of philosophy and communications. I study the industrial and logical disposition (dispositif) of the API of The Echo Nest, a complex musical search and recommandation engine. I seek to grasp the aesthetic effects of this technoogy as a means of understanding the extent to which contemporary digital culture shapes musical experience. This is approached from three perspectives: an archeology of listening, which shows what is inherited in the online listening experience; a critical reading of the politics of digital archiving and algorithms,which incites us to think about the industrial axiologies of « machines of taste » ; and lastly, a semiotic-pragmatic analysis, which draws attention to the fictional modalities involved in mediated listening. With the emergence of music streaming as a new form of radio, this dissertation traces a contemporary regime of digitized perception (digital sensorium) that becomes a « discipline oflistenable » supported by the fictional mode of online production of meaning
Lafi, Walid. "Architectures multiprocesseurs pour applications de télécommunication basées sur les technologies d'intégration 3D." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00623415.
Full textGlad, Arnaud. "Etude de l'auto-organisation dans les algorithmes de patrouille multi-agent fondés sur les phéromones digitales." Phd thesis, Université Nancy II, 2011. http://tel.archives-ouvertes.fr/tel-00646293.
Full textBeninca, de Farias Giovanni. "Etude de solutions OFDM en technologie "Photonique Silicium" pour les futures générations de réseaux optiques passifs." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENT083/document.
Full textIn the context of Passive Optical Networks (PON), operators are looking for innovative solutions to increase aggregated data-rate, split-ratio and reach. Another requirement is that transceivers should be as low-cost as possible. The optical Orthogonal Frequency Division Multiplexing (OFDM) technique can improve performance of the transmission in terms of data-rate and reach as compared to classical single-carrier On-Off Keying (OOK) modulation. At the same time, the silicon photonics technology can lower the cost per unit of the transceiver, due to its mass production and E/O integration capabilities. Optical OFDM has already shown its potential using commercially available optical components. However, its use with silicon photonics Directly-Modulated Lasers (DML) and modulators is more challenging. The objective of this work is to study the performance of OFDM -based solutions for future PON, using silicon photonics transmitters. For that purpose, a dedicated simulation platform is developed. The OFDM modem is implemented, as well as models of silicon photonic devices built during this thesis. These models are validated by characterizing physical components available for test. In parallel, an experimental test-bed is developed. The silicon photonics transmitters are benchmarked with commercial-available transmitters for OFDM-based optical systems. For Intensity-Modulated/Directly-Detected (IM/DD) links, the use of optical OFDM with adaptive bit and power loading is proposed to maximize spectral efficiency. Two types of silicon photonics transmitters are considered: directly modulated III/V-on-silicon lasers (experiment) and external optical modulators such as Mach-Zehnder Modulator (MZM) (simulation) and ring-resonator (simulation and experiment). Experimental results show that the hybrid DML can provide more than 10Gbps aggregated data-rate over at least 50km, which is a requirement for future uplink PON (from the subscriber to the central office). For the silicon ring modulator, because of the high coupling loss in and out of the photonic chip, reach was limited to 20km for a data-rate higher than 10Gbps. These are the first experimental demonstrations of OFDM modulation with hybrid III/V-on-silicon lasers and silicon ring-resonator modulator. Besides, simulation results show that reach can be indeed improved up to 100km if the optical signal is amplified or the coupling loss reduced. A modulation technique called Single-Side Band (SSB)-OFDM is known to improve the [bandwidth x reach] product of the link, as compared to IM/DD (Dual-Side Band (DSB)) systems. However, it requires expensive transmitters with several discrete optical components. As silicon photonics technology allows a very high level of integration between different optical components and between electrical and optical devices, a silicon optical IQ modulator enabling ac{SSB}-ac{OFDM} technique is investigated. Simulation results of a study-case reveal that a relatively low optical budget penalty (up to 3dB) of the silicon photonics transmitters as compared to the LiNbO3 modulator is achieved. The solutions presented in this thesis are demonstrated to be compliant with future PON in terms of data-rate, with relatively low bandwidth (<6.25GHz) electronics. This is a great asset for the considered application. The driving voltages required for typical IM/DD systems showed to be closer to what CMOS driving circuitry can provide (about 2Vpp). Recent developments on high-speed digital signal processors and D/A-A/D converters, using CMOS technologies, make optical-OFDM an attractive solution for future PONs as full-Silicon-transmitters could be used