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Dissertations / Theses on the topic 'Estimation scalable de l'incertitude'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Candela, Rosa. "Robust and scalable probabilistic machine learning methods with applications to the airline industry." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS078.

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Dans le secteur aérien, la prévision des prix joue un rôle important tant pour les clients que pour les agences de voyage. Dans cette thèse, nous présentons quelques approches pratiques pour aider les voyageurs à faire face à l'incertitude dans l'évolution du prix des billets et nous proposons un cadre basé sur des données pour surveiller les performances des modèles de prévision de séries chronologiques. La descente de gradient stochastique (SGD) représente la méthode d'optimisation plus utilisée dans le domaine de l'apprentissage automatique et cela est également vrai pour les systèmes distr

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Rossi, Simone. "Improving Scalability and Inference in Probabilistic Deep Models." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS042.

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Au cours de la dernière décennie, l'apprentissage profond a atteint un niveau de maturité suffisant pour devenir le choix privilégié pour résoudre les problèmes liés à l'apprentissage automatique ou pour aider les processus de prise de décision.En même temps, l'apprentissage profond n'a généralement pas la capacité de quantifier avec précision l'incertitude de ses prédictions, ce qui rend ces modèles moins adaptés aux applications critiques en matière de risque.Une solution possible pour résoudre ce problème est d'utiliser une formulation bayésienne ; cependant, bien que cette solution soit él

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Pinson, Pierre. "Estimation de l'incertitude des prédictions de production éolienne." Phd thesis, École Nationale Supérieure des Mines de Paris, 2006. http://pastel.archives-ouvertes.fr/pastel-00002187.

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L'énergie éolienne connaît un développement considérable en Europe. Pourtant, le caractère intermittent de cette énergie renouvelable introduit des difficultés pour la gestion du réseau électrique. De plus, dans le cadre de la dérégulation des marchés de l'électricité, l'énergie éolienne est pénalisée par rapport aux moyens de production contrôlables. La prédiction de la production éolienne à des horizons de 2-3 jours aide l'intégration de cette énergie. Ces prédictions consistent en une seule valeur par horizon, qui correspond à la production la plus probable. Cette information n'est pas suff

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Lu, Ruijin. "Scalable Estimation and Testing for Complex, High-Dimensional Data." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/93223.

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With modern high-throughput technologies, scientists can now collect high-dimensional data of various forms, including brain images, medical spectrum curves, engineering signals, etc. These data provide a rich source of information on disease development, cell evolvement, engineering systems, and many other scientific phenomena. To achieve a clearer understanding of the underlying mechanism, one needs a fast and reliable analytical approach to extract useful information from the wealth of data. The goal of this dissertation is to develop novel methods that enable scalable estimation, testing,

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Blier, Mylène. "Estimation temporelle avec interruption: les effets de localisation et de durée d'interruptions sont-ils sensibles à l'incertitude ?" Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26367/26367.pdf.

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Blier, Mylène. "Estimation temporelle avec interruption : les effets de localisation et de durée d'interruption sont-ils sensibles à l'incertitude ?" Doctoral thesis, Université Laval, 2009. http://hdl.handle.net/20.500.11794/21201.

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Lors d'études portant sur la production d'intervalles temporels avec interruption, deux principaux effets sont généralement retrouvés lorsque la localisation et la durée de l'interruption varient: les productions temporelles sont plus courtes 1) lorsque l'interruption arrive tôt dans l'intervalle de temps et 2) lorsque la durée de l'interruption est plus longue. L'effet de localisation s'explique principalement par un partage attentionnel lors de la période qui précède l'interruption, mais peut aussi refléter en partie l'effet de processus préparatoires précédant l'interruption. L'effet de dur

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7

Kang, Seong-Ryong. "Performance analysis and network path characterization for scalable internet streaming." Texas A&M University, 2008. http://hdl.handle.net/1969.1/85912.

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Delivering high-quality of video to end users over the best-effort Internet is a challenging task since quality of streaming video is highly subject to network conditions. A fundamental issue in this area is how real-time applications cope with network dynamics and adapt their operational behavior to offer a favorable streaming environment to end users. As an effort towards providing such streaming environment, the first half of this work focuses on analyzing the performance of video streaming in best-effort networks and developing a new streaming framework that effectively utilizes unequal im

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Rahmani, Mahmood. "Urban Travel Time Estimation from Sparse GPS Data : An Efficient and Scalable Approach." Doctoral thesis, KTH, Transportplanering, ekonomi och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-167798.

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The use of GPS probes in traffic management is growing rapidly as the required data collection infrastructure is increasingly in place, with significant number of mobile sensors moving around covering expansive areas of the road network. Many travelers carry with them at least one device with a built-in GPS receiver. Furthermore, vehicles are becoming more and more location aware. Vehicles in commercial fleets are now routinely equipped with GPS. Travel time is important information for various actors of a transport system, ranging from city planning, to day to day traffic management, to indiv

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Shriram, Alok Kaur Jasleen. "Efficient techniques for end-to-end bandwidth estimation performance evaluations and scalable deployment /." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2009. http://dc.lib.unc.edu/u?/etd,2248.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2009.<br>Title from electronic title page (viewed Jun. 26, 2009). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Computer Science." Discipline: Computer Science; Department/School: Computer Science.

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Simsa, Jiri. "Systematic and Scalable Testing of Concurrent Programs." Research Showcase @ CMU, 2013. http://repository.cmu.edu/dissertations/285.

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The challenge this thesis addresses is to speed up the development of concurrent programs by increasing the efficiency with which concurrent programs can be tested and consequently evolved. The goal of this thesis is to generate methods and tools that help software engineers increase confidence in the correct operation of their programs. To achieve this goal, this thesis advocates testing of concurrent software using a systematic approach capable of enumerating possible executions of a concurrent program. The practicality of the systematic testing approach is demonstrated by presenting a novel

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Mallet, Vivien. "Estimation de l'incertitude et prévision d'ensemble avec un modèle de chimie transport - Application à la simulation numérique de la qualité de l'air." Phd thesis, Ecole des Ponts ParisTech, 2005. http://pastel.archives-ouvertes.fr/pastel-00001654.

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La thèse s'attache à évaluer la qualité d'un modèle de chimie-transport, non pas par une comparaison classique aux observations, mais en estimant ses incertitudes a priori dues aux données d'entrées, à la formulation du modèle et aux approximations numériques. L'étude de ces trois sources d'incertitude est menée respectivement grâce à des simulations Monte Carlo, des simulations multi-modèles et des comparaisons entre schémas numériques. Une incertitude élevée est mise en évidence, pour les concentrations d'ozone. Pour dépasser les limitations dues à l'incertitude, une stratégie réside dans la

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Alrammal, Muath. "Algorithms for XML stream processing : massive data, external memory and scalable performance." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00779309.

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Plusieurs applications modernes nécessitent un traitement de flux massifs de données XML, cela crée de défis techniques. Parmi ces derniers, il y a la conception et la mise en ouvre d'outils pour optimiser le traitement des requêtes XPath et fournir une estimation précise des coûts de ces requêtes traitées sur un flux massif de données XML. Dans cette thèse, nous proposons un nouveau modèle de prédiction de performance qui estime a priori le coût (en termes d'espace utilisé et de temps écoulé) pour les requêtes structurelles de Forward XPath. Ce faisant, nous réalisons une étude expérimentale

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Schmidt, Aurora C. "Scalable Sensor Network Field Reconstruction with Robust Basis Pursuit." Research Showcase @ CMU, 2013. http://repository.cmu.edu/dissertations/240.

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We study a scalable approach to information fusion for large sensor networks. The algorithm, field inversion by consensus and compressed sensing (FICCS), is a distributed method for detection, localization, and estimation of a propagating field generated by an unknown number of point sources. The approach combines results in the areas of distributed average consensus and compressed sensing to form low dimensional linear projections of all sensor readings throughout the network, allowing each node to reconstruct a global estimate of the field. Compressed sensing is applied to continuous source

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Soh, Jeremy. "A scalable, portable, FPGA-based implementation of the Unscented Kalman Filter." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17286.

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Sustained technological progress has come to a point where robotic/autonomous systems may well soon become ubiquitous. In order for these systems to actually be useful, an increase in autonomous capability is necessary for aerospace, as well as other, applications. Greater aerospace autonomous capability means there is a need for high performance state estimation. However, the desire to reduce costs through simplified development processes and compact form factors can limit performance. A hardware-based approach, such as using a Field Programmable Gate Array (FPGA), is common when high perfor

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Raghavan, Venkatesh. "VAMANA -- A high performance, scalable and cost driven XPath engine." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0505104-185545/.

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Werner, Stéphane. "Optimisation des cadastres d'émissions: estimation des incertitudes, détermination des facteurs d'émissions du "black carbon" issus du trafic routier et estimation de l'influence de l'incertitude des cadastres d'émissions sur la modélisation : application aux cadastres Escompte et Nord-Pas-de-Calais." Strasbourg, 2009. https://publication-theses.unistra.fr/public/theses_doctorat/2009/WERNER_Stephane_2009.pdf.

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Les cadastres d’émissions ont un rôle fondamental dans le contrôle de la pollution atmosphérique, à la fois directement, pour le recensement des émissions et comme données d’entrée pour les modèles de pollution atmosphérique. Le travail de cette thèse a eu pour principal objectif l’optimisation de cadastres existants, notamment celui du programme ESCOMPTE « Expériences sur Site pour COntraindre les Modèles de Pollution atmosphérique et de Transport d'Emissions ». Pour ce cadastre, deux problématiques distinctes ont été développées : l’une visant à évaluer au mieux l’incertitude portant sur les

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Brunner, Manuela. "Hydrogrammes synthétiques par bassin et types d'événements. Estimation, caractérisation, régionalisation et incertitude." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAU003/document.

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L'estimation de crues de projet est requise pour le dimensionnement de barrages et de bassins de rétention, de même que pour la gestion des inondations lors de l’élaboration de cartes d’aléas ou lors de la modélisation et délimitation de plaines d’inondation. Généralement, les crues de projet sont définies par leur débit de pointe à partir d’une analyse fréquentielle univariée. Cependant, lorsque le dimensionnement d’ouvrages hydrauliques ou la gestion de crues nécessitent un stockage du volume ruisselé, il est également nécessaire de connaître les caractéristiques volume, durée et forme de l’

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Fissore, Giancarlo. "Generative modeling : statistical physics of Restricted Boltzmann Machines, learning with missing information and scalable training of Linear Flows." Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG028.

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Les modèles de réseaux neuronaux capables d'approximer et d'échantillonner des distributions de probabilité à haute dimension sont connus sous le nom de modèles génératifs. Ces dernières années, cette classe de modèles a fait l'objet d'une attention particulière en raison de son potentiel à apprendre automatiquement des représentations significatives de la grande quantité de données que nous produisons et consommons quotidiennement. Cette thèse présente des résultats théoriques et algorithmiques relatifs aux modèles génératifs et elle est divisée en deux parties. Dans la première partie, nous

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Biletska, Krystyna. "Estimation en temps réel des flux origines-destinations dans un carrefour à feux par fusion de données multicapteurs." Compiègne, 2010. http://www.theses.fr/2010COMP1893.

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La qualité de l’information concernant les origines et les destinations (OD) des véhicules dans un carrefour influence la performance de nombreux systèmes des transports routiers. La période de sa mise à jour conditionne l’échelle temporelle de fonctionnement de ces systèmes. Nous nous intéressons au problème de reconstitution à chaque cycle de feux des OD des véhicules traversant un carrefour à partir des états des feux et des mesures de trafic provenant des capteurs vidéo. Les mesures de trafic, fournies à la seconde, sont les débits aux entrées/sorties du carrefour et les nombres de véhicul

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Tamssaouet, Ferhat. "Towards system-level prognostics : modeling, uncertainty propagation and system remaining useful life prediction." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0079.

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Le pronostic est le processus de prédiction de la durée de vie résiduelle utile (RUL) des composants, sous-systèmes ou systèmes. Cependant, jusqu'à présent, le pronostic a souvent été abordé au niveau composant sans tenir compte des interactions entre les composants et l'impact de l'environnement, ce qui peut conduire à une mauvaise prédiction du temps de défaillance dans des systèmes complexes. Dans ce travail, une approche de pronostic au niveau du système est proposée. Cette approche est basée sur un nouveau cadre de modélisation : le modèle d'inopérabilité entrée-sortie (IIM), qui permet d

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Zhang, Hongwei. "Dependable messaging in wireless sensor networks." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1155607973.

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Friedman, Timur. "Scalable estimation of multicast session characteristics." 2002. https://scholarworks.umass.edu/dissertations/AAI3056225.

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So that Internet multicast sessions can reach thousands, or even millions, of participants, rather than the tens they reach today, we need new techniques for estimating important session management parameters. These parameters include the number of participants in a multicast session, the topology of the multicast tree, and the loss rates along links in the tree. Such parameters can be used by adaptive algorithms for improved data transmission. For example, forward error correction for lost multicast packets can be tuned to the number of participants, and participants can use topology and loss

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Chou, Kao-Peng, and 周高鵬. "Disintegrated Channel Estimation in Scalable Filter-and-Forward Relay Networks." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/52ub2d.

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博士<br>國立中央大學<br>通訊工程學系<br>105<br>Cooperative communication, which has attracted the attention of researchers in recent years, enables the efficient use of resources in mobile communication systems. The research of cooperative communication begin with relay generated multi-link transmission. From the simplest amplify-and-forward to the most complicated decode-and-forward, relay serves a role of extending the coverage ratio for wireless signal in a practical manner. Deploying a single relay or series connected relays is popular because of its simplicity. Conversely, employing parallel relays and

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Hsu, Mei-Yun, and 許美雲. "Scalable Module-Based Architecture for MPEG-4 BMA Motion Estimation." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/28766556141470208247.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>88<br>In this paper, we present a scalable module-based architecture for block matching motion estimation algorithm of MPEG-4. The basic module is one set of processing elements based on one-dimensional systolic array architecture. To support various applications, different modules of processing elements can be configured to form the processing element array to meet the requirements, such as variable block size, search range and computation power. And this proposed architecture has the advantage of few I/O port counts. Based on eliminating unnecessary signal transit

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Lee, Chien-tai, and 李建泰. "Utilize bandwidth estimation and scalable video coding to improve IPTV performance." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/19772935081286056642.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>100<br>With the advance of multimedia technologies and Internet prevalence, multimedia has become one of major information communication tools. To provide network multimedia services, both Internet Protocal TV (IPTV) and Peer-to-Peer (P2P) network control are the most important technologies. The Internet multimedia has evolved from voice communications to high definition (HD) video communications. The Open IPTV Forum, OIPF, is aiming to propose the IPTV system standard, which proclaims the potential of IPTV-related technologies. In this thesis, we proposed to adjus

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Li, Yao, and 李曜. "A Quality Scalable H.264/AVC Fractional Motion Estimation IP Design and Implementation." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/89804086435993035420.

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碩士<br>國立中正大學<br>資訊工程所<br>96<br>This thesis presents a quality scalable fractional motion estimation (QS-FME) IP design for H.264/AVC video coding application. The proposed design is based on the algorithm of QS-FME which supports 3 modes, including full mode, reduced mode and single mode, with different computational complexity. Compare to full mode, the single mode can reduce 90% computation complexity and suite for portable devices. Full mode can achieve average PSNR drop in 0.007 dB. In some cases, the full mode even has better compression quality than the algorithm in JM9.3. About the redu

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Chien, Wen-Hsien, and 錢文賢. "Design and Implementation Scalable of VLSI Architecture for Variable Block Size Motion Estimation." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/11917898479588814560.

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Tsao, Ko-Chia, and 曹克嘉. "Motion estimation design for H.264/MPEG4-AVC video coding and its scalable extension." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/15411133728236860335.

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碩士<br>國立交通大學<br>電子研究所<br>100<br>Motion estimation is (ME) is the most complex part and the bottle neck of a real time video encoder. The adoption of inter-layer prediction (IL prediction) in H.264/AVC SVC extension even increases the computing time and memory bandwidth of ME. Thus, we adopted the previous data efficient inter-layer prediction algorithm [4] to save the memory bandwidth. In this thesis, we propose the corresponding hardware architecture for inter-layer prediction which can process INTER mode and different inter-layer prediction modes in parallel to save the computing time and me

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Wang, Te-Heng, and 王特亨. "Fast Priority-Based Mode Decision and Activity-Based Motion Estimation for Scalable Video Coding." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/98022885907305615825.

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碩士<br>國立東華大學<br>電子工程研究所<br>98<br>In H.264/AVC scalable video coding (SVC), the multi-layer motion estimation between different layers achieves spatial scalability but accompanies with high coding complexity. To accelerate the encoding time in SVC, a priority-based mode decision and an activity-based motion estimation are proposed in this thesis. In the proposed mode decision, the rate-distortion costs of the base layer are used to decide the priority of the mode in enhancement layer. The activity-based motion estimation employs motion vector difference in base layer to decrease search range. W

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Wang, Xiaoming. "Robust and Scalable Sampling Algorithms for Network Measurement." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-2391.

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Recent growth of the Internet in both scale and complexity has imposed a number of difficult challenges on existing measurement techniques and approaches, which are essential for both network management and many ongoing research projects. For any measurement algorithm, achieving both accuracy and scalability is very challenging given hard resource constraints (e.g., bandwidth, delay, physical memory, and CPU speed). My dissertation research tackles this problem by first proposing a novel mechanism called residual sampling, which intentionally introduces a predetermined amount of bias into the

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Mir, arabbaygi Siavash. "Novel scalable approaches for multiple sequence alignment and phylogenomic reconstruction." Thesis, 2015. http://hdl.handle.net/2152/31377.

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The amount of biological sequence data is increasing rapidly, a promising development that would transform biology if we can develop methods that can analyze large-scale data efficiently and accurately. A fundamental question in evolutionary biology is building the tree of life: a reconstruction of relationships between organisms in evolutionary time. Reconstructing phylogenetic trees from molecular data is an optimization problem that involves many steps. In this dissertation, we argue that to answer long-standing phylogenetic questions with large-scale data, several challenges need to be add

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Syu, Jhe-wei, and 許哲維. "Fast Inter-Layer Motion Estimation Algorithm on Spatial Scalability in H.264/AVC Scalable Extension." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/52s9c2.

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碩士<br>國立中央大學<br>通訊工程研究所<br>97<br>With the improvements of video coding technology, network infrastructures, storage capacity, and CPU computing capability, the applications of multimedia systems become wider and more popular. Therefore, how to efficiently provide video sequences to users under different constraints is very important, and scalable video coding is one of the best solutions to this problem. H.264 scalable extension (SVC) that is constructed based on H.264/AVC is the most recent scalable video coding standard. SVC utilizes the inter-layer prediction to substantially improve th

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Veerapandian, Lakshmi. "A spatial scalable video coding with selective data transmission using wavelet decomposition." Thesis, 2010. http://hdl.handle.net/2440/61956.

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In this research a scalable video coding framework is proposed, mainly focusing on spatial scalability, and a subjective data compression algorithm based on: (1) quality, (2) resolution (target output device), and (3) bandwidth. This framework enables the scalable delivery of video based on the output display resolution, and through a congested network or limited bandwidth with an acceptable visual quality. In order to achieve this scalable framework we have used wavelets, for greater flexibility, and a multiresolution approach. The multiresolution motion estimation (MRME) provides the reusab

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Kao, Hsiang-Chieh, and 高祥桔. "Fast Motion Estimation Algorithm and Its Architecture Analysis for H.264/AVC Scalable Extension IP Design." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/77242030713406273263.

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碩士<br>雲林科技大學<br>電子與資訊工程研究所<br>98<br>In the past few years, wireless communications with varied bandwidth have achieved innovation in the video compression technology and driven a developing standard for scalable video coding(SVC). H.264/AVC scalable extension extends from H.264/AVC for SVC. As comparing to H.264/AVC, H.264/AVC scalable extension adds three features which provide temporal, spatial and signal-to-noise ration (SNR) scalabilities. These not only allow more flexible than H.264/AVC but also cause huge encoding complexity especially for the motion vector (MV) searching. The proposed

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Maharaju, Rajkumar. "Devolopment of Mean and Median Based Adaptive Search Algorithm for Motion Estimation in SNR Scalable Video Coding." Thesis, 2015. http://ethesis.nitrkl.ac.in/7725/1/2015_MT_Development_Rajkumar_Maharaju.pdf.

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Now a day’s quality of video in encoding is challenging in many video applications like video conferences, live streaming and video surveillance. The development of technology has resulted in invention of various devices, different network conditions and many more. This has made video coding challenging day by day. An answer to the need of all can be scalable video coding, where a single bit stream contains more than one layer known as base and enhancement layers respectively. There are various types of scalability as spatial, SNR, temporal scalability. Among these three types of scalability,

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Li, Gwo-Long, and 李國龍. "The Study of Bandwidth Efficient Motion Estimation for H.264/MPEG4-AVC Video Coding and Its Scalable Extension." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/74663865189997103364.

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博士<br>國立交通大學<br>電子研究所<br>100<br>In the video coding system, the overall system performance is dominated by the motion estimation module due to its high computational complexity and memory bandwidth intensive data accesses. Furthermore, with the increasing demands of high definition TV, the system performance drop caused by the intensive data bandwidth access requirement becomes even more significant. In addition, the additional adopted Inter-layer prediction modes of scalable video coding also significant increase the data access bandwidth overhead and computational complexity.　To solve the hi

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Isaac, Tobin Gregory. "Scalable, adaptive methods for forward and inverse problems in continental-scale ice sheet modeling." Thesis, 2015. http://hdl.handle.net/2152/31372.

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Projecting the ice sheets' contribution to sea-level rise is difficult because of the complexity of accurately modeling ice sheet dynamics for the full polar ice sheets, because of the uncertainty in key, unobservable parameters governing those dynamics, and because quantifying the uncertainty in projections is necessary when determining the confidence to place in them. This work presents the formulation and solution of the Bayesian inverse problem of inferring, from observations, a probability distribution for the basal sliding parameter field beneath the Antarctic ice sheet. The basal slid

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