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Dissertation
Traitement des signaux bruités via l'analyse multirésolution
Authors: --- --- --- --- --- et al.
Year: 2019 Publisher: Liège Université de Liège (ULiège)

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Abstract

Nous nous intéressons au traitement de signaux bruités, mais plus particulièrement sur une méthode appelée le soft thresholding. Nous développons dans un premier temps tous les outils nécessaires à la bonne compréhension du soft thresholding. Le premier chapitre est consacré aux ondelettes et à l'analyse multirésolution. Ensuite, Nous étudions l'algorithme de Mallat, utiles pour obtenir les coefficients d'ondelettes d'un signal. Le dernier outil est l'objet du troisième chapitre, consacré à une brève description des espaces de Hölder et de Besov. Enfin, tous les outils précédemment vus sont utilisés dans ce dernier chapitre afin d'étudier le traitement du signal. La majeure partie est consacrée au soft thresholding. Nous étudions d'abord son erreur moyenne quadratique, pour enfin étudier la régularité des signaux traités. Une section est également consacrée à quelques généralités sur le hard thresholding. We are interested in signal processing, but more specifically in the soft thresholding. First of, we develop some necessary tools to understand properly the soft thresholding. The first chapter is devoted to wavelets and multiresolution analysis. Then, we study the Mallat algorithm which is usefull to obtain the wavelets coefficients of a signal. Last but not least, we introduce Hölder and Besov spaces. All the previous chapters are used to develop the soft thresholding. The major part of the last chapter is devoted to the soft thresholding; we study the mean squared error of it and the regularity of a processed signal. A brief introduction to the hard thresholding ends this paper.


Book
Risk Analysis and Portfolio Modelling
Authors: ---
ISBN: 3039216252 3039216244 Year: 2019 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Financial Risk Measurement is a challenging task, because both the types of risk and the techniques evolve very quickly. This book collects a number of novel contributions to the measurement of financial risk, which address either non-fully explored risks or risk takers, and does so in a wide variety of empirical contexts.


Book
Cognitive Aspects of Human-Computer Interaction for GIS
Author:
ISBN: 3039215698 303921568X Year: 2019 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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The book is dealing with recent progress in human–computer interaction (HCI) related to geographic information science (GIS). The Editorial starts with an overview about the evolution of the Internet and first HCI concepts and stimulates recent HCI developments using 3D and 4D apps, running on all mobile devices with OS Android, iOS, Linus, and Windows. Eight research articles present the state-of-the-art in HCI–GIS-related issues, starting with gender and age differences in using indoor maps via the estimation of building heights from space to an efficient visualization method for polygonal data with dynamic simplification. The review article deals with progress and challenges on entity alignment of geographic knowledge bases.


Book
Microgrids
Author:
ISBN: 3039218697 3039218689 Year: 2020 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Electrical power systems are evolving at the generation, transmission, and distribution levels. At distribution level, small generating and storage units—the so-called distributed energy sources (DERs)—are being installed close to consumption sites. The expansion of DERs is empowering renewable energy source integration and, as a consequence, new actors are appearing in electrical systems. Among them, the prosumer is a game-changer; the fruit of the behavior transformation of the consumer who has not only the ability to consume power but also to produce it. Microgrids can be understood as DER installations that have the capability of both grid-connected and grid-isolated operation. During the last decades, there has been a significant deployment of microgrids (e.g., in countries like the United States, Switzerland, and Denmark) and a consequent increase in renewable energy generation. This is contributing to the decarbonization of electrical power systems. However, the variability and intermittency of renewable sources introduce uncertainty, which implies a more complex operation and control. Taking into account that existing and future planned microgrids are being/going to be interconnected to the current electrical network, challenges in terms of design, operation, and control at power system level need to be addressed, considering existing regulations.

Keywords

energy management system --- buck-boost converter --- generic object oriented substation event (GOOSE) communication --- stochastic optimization --- optimal dispatch --- decision tree --- coordinated control --- optimization --- congestion problems --- distributed optimization --- IEC 61850 Standard --- distributed energy resources (DERs) --- technical and economic optimization --- reliability evaluation --- power quality disturbances --- renewable --- DC microgrid --- HESS --- ruleless EV --- extension theory --- network planning --- integrated electrical and thermal grids --- reliability --- photovoltaic feasibility --- flexibility --- microgrid test facility --- microgrid --- multiresolution --- small-scale standalone microgrid --- IEC 61850 --- direct search method (DSM) --- maximum electrical efficiency --- load frequency control (LFC) --- droop control --- flexible generation --- grid independence --- frequency control --- particle swarm optimization --- battery storage --- microgrid stability controller (MSC) --- doubly fed induction machine --- coordinative optimization of energy --- power distribution --- hierarchical control scheme --- grounding --- operation --- electric energy market --- nonlinear programming --- cost and life --- total sliding-mode control --- distributed energy resource --- vehicle information system --- peak-cut --- smoothing wind power --- genetic algorithm --- medium-voltage networks --- vehicle-to-grid --- devices scheduling --- microgrids --- energy storage --- electric vehicle --- energy efficiency --- active filter --- embedded system --- multivariable generalized predictive control (MGPC) --- load power sharing --- flywheel energy storage (FES) --- renewable sources --- telecommunication power management --- micro-grid --- smart inverter --- distributed generation --- storage systems --- electric vehicle (EV) --- microgrid (MG) --- mesh configuration --- residential users --- renewable energy source --- radial configuration --- S-transform --- optimal power flow --- solid oxide fuel cell --- vehicle-to-grid (V2G) --- communication delay --- current harmonic reduction --- smart grids --- inrush current --- flexible and configurable architecture --- optimal capacity --- ESS effective rate --- smart grid --- multi-agent --- distributed energy resources --- regular EV --- peak-shift --- datacenter --- deterministic optimization --- plug and play --- chaos synchronization detection --- residential power systems --- power quality --- combined power generation system --- DC distribution --- isolated grid --- coordinated control strategy --- DC architectures --- predictive control --- demand-side management --- distributed generation (DG) --- curtailment

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