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Rozprawy doktorskie na temat „GRADIENT COMPUTATION”

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Data publikacji: 11 września 2023

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1

Qiao, Lei Ph D. Massachusetts Institute of Technology. "Variational constitutive updates for strain gradient isotropic plasticity." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55079.

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Thesis (S.M.)--Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 93-96).<br>In the past decades, various strain gradient isotropic plasticity theories have been developed to describe the size-dependence plastic deformation mechanisms observed experimentally in micron-indentation, torsion, bending and thin-film bulge tests in metallic materials. Strain gradient plasticity theories also constitute a convenient device to introduce ellipticity in the differential equation
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2

Damou, Merzak. "Measurement and computation of a turbulent jet in an axial pressure gradient." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305418.

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Sitta, Alessandro. "Privacy-Preserving Distributed Optimization via Obfuscated Gradient Tracking." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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As the modern world becomes increasingly digitized and interconnected, distributed systems have proven to be effective in the processing of large volumes of data. In this context, optimization techniques have become essential in an extensive range of domains. However, a major concern, regarding the privacy issue in handling sensitive data, has recently emerged. To address this privacy issue we propose a novel consensus-based privacy-preserving distributed optimization algorithm called Obfuscated Gradient Tracking. The algorithm is characterized by a balanced noise insertion method which prot
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Al-Mudhaf, Ali F. "A feed forward neural network approach for matrix computations." Thesis, Brunel University, 2001. http://bura.brunel.ac.uk/handle/2438/5010.

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A new neural network approach for performing matrix computations is presented. The idea of this approach is to construct a feed-forward neural network (FNN) and then train it by matching a desired set of patterns. The solution of the problem is the converged weight of the FNN. Accordingly, unlike the conventional FNN research that concentrates on external properties (mappings) of the networks, this study concentrates on the internal properties (weights) of the network. The present network is linear and its weights are usually strongly constrained; hence, complicated overlapped network needs to
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Sautter, Rubens Andreas. "Gradient Pattern Analysis: New methodological and computational features with applications." Instituto Nacional de Pesquisas Espaciais (INPE), 2018. http://urlib.net/sid.inpe.br/mtc-m21c/2018/05.07.12.09.

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Neste trabalho é apresentado a Análise de Padrões Gradientes (no inglês GPA), um formalismo que descreve operadores para a análise de matrizes, por meio da simetria. Com o objetivo de analisar bases de dados extensas, neste trabalho é proposto o refinamento da versão mais popular do GPA, a respeito da medida e da complexidade computacional. Neste estudo é apresentado todos os momentos gradiente, e testado o primeiro e segundo momento gradiente (respectivamente G1 e G2). A fim de testar o refinamento das técnicas G1 e G2 é apresentado os casos de estudos: (i) um estudo de caso dinâmicos em Grad
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Chauffour, Marie-Laure. "Shock-based waverider design with pressure gradient corrections and computational simulations." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1829.

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Thesis (M.S.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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7

Fischer, Paul [Verfasser], and Paul [Akademischer Betreuer] Steinmann. "C1 Continuous Methods in Computational Gradient Elasticity / Paul Fischer. Betreuer: Paul Steinmann." Erlangen : Universitätsbibliothek der Universität Erlangen-Nürnberg, 2011. http://d-nb.info/1015783635/34.

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Miles, Alexander, William Duncan, Brian Klug, and Colton Holmes. "Rapid Prototyped Terahertz-Domain Gradient Index Optics: Computational Design, Simulation, and Manufacture." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595744.

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ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada<br>There are a myriad of applications for terahertz radiation: security, military radar, product inspection, and telecommunications. These require manipulation of the radiation beyond simple transmission and detection, namely refraction: focusing, defocusing, and collimation. The current state of the art fabrication of terahertz lenses is an expensive and time consuming processes; involving high purity semicon
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9

Thill, Serge. "A computational analysis of the gradient navigation strategies of the nematode Caenorhabditis elegans." Thesis, University of Leicester, 2008. http://hdl.handle.net/2381/4014.

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In the present thesis, we apply computational methods to the study of animal behaviour. Specifically, we are interested in the gradient navigation strategies of C. elegans, for which we show that there are many interesting questions that have not yet been answered by existing research. In order to study the behaviour of C. elegans, we first develop a range of tools to help us do so. We base a large part of our work on Markov-like models of behaviour and since these are not Markovian in the strict sense (limiting the analytical tools which can be used to study their behaviour), we first present
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10

Norris, Michael K. "INCORPORATING HISTOGRAMS OF ORIENTED GRADIENTS INTO MONTE CARLO LOCALIZATION." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1629.

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This work presents improvements to Monte Carlo Localization (MCL) for a mobile robot using computer vision. Solutions to the localization problem aim to provide fine resolution on location approximation, and also be resistant to changes in the environment. One such environment change is the kidnapped/teleported robot problem, where a robot is suddenly transported to a new location and must re-localize. The standard method of "Augmented MCL" uses particle filtering combined with addition of random particles under certain conditions to solve the kidnapped robot problem. This solution is robust,
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11

Löf, Henrik. "Parallelizing the Method of Conjugate Gradients for Shared Memory Architectures." Licentiate thesis, Uppsala universitet, Avdelningen för teknisk databehandling, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-86295.

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Solving Partial Differential Equations (PDEs) is an important problem in many fields of science and engineering. For most real-world problems modeled by PDEs, we can only approximate the solution using numerical methods. Many of these numerical methods result in very large systems of linear equations. A common way of solving these systems is to use an iterative solver such as the method of conjugate gradients. Furthermore, due to the size of these systems we often need parallel computers to be able to solve them in a reasonable amount of time. Shared memory architectures represent a class of p
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12

Dube, Zack. "Computational Reconstruction of the Physical Eye Using a New Gradient Index of Refraction Model." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34791.

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This thesis proposes and tests an individually customizable model of the human crystalline lens. This model will be crucial in developing both research on the human eye and driving diagnostic tools to help plan and treat optical issues, such as those requiring refractive surgery. This thesis attempts to meet two goals: first, it will determine whether this new lens model can reproduce the major aberrations of real human eyes using a computational framework. Second, it will use clinical information to measure how well this model is able to predict post-operation results in refractive surgery
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13

Lemdiasov, Rostislav A. "A general purpose computational approach to the design of gradient coils for arbitrary geometries." Worcester, Mass. : Worcester Polytechnic Institute, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-09214-155502/.

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14

Chen, Guozhang. "Dynamical and computational mechanisms of biological and artificial neural circuits." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23710.

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Spatiotemporal activity dynamics with criticality have been widely observed in the cortex. In this thesis, we focus on elucidating the fundamental computational roles of these critical circuit dynamics in both biological and artificial neural networks. We first propose a novel neural computation mechanism, Computing by Modulating Spontaneous Activity (CMSA), for understanding visual perception. Using biophysically plausible circuit models, we demonstrate that spontaneous activity patterns with criticality are modulated by external stimuli to give rise to neural responses. We find that CMSA mec
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15

Pinto, Marcio Augusto Sampaio 1977. "Método de otimização assitido para comparação entre poços convencionais e inteligentes considerando incertezas." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263725.

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Orientador: Denis José Schiozer<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica e Instituto de Geociências<br>Made available in DSpace on 2018-08-24T00:34:10Z (GMT). No. of bitstreams: 1 Pinto_MarcioAugustoSampaio_D.pdf: 5097853 bytes, checksum: bc8b7f6300987de2beb9a57c26ad806a (MD5) Previous issue date: 2013<br>Resumo: Neste trabalho, um método de otimização assistido é proposto para estabelecer uma comparação refinada entre poços convencionais e inteligentes, considerando incertezas geológicas e econômicas. Para isto é apresentada uma metodologia d
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16

Higgins, K. "Comparison of engineering correlations for predicting heat transfer in zero-pressure-gradient compressible boundary layers with CFD and experimental data." Fishermans Bend, Victoria : Defence Science and Technology Organisation, 2008. http://hdl.handle.net/1947/9653.

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17

Keller, Frank. "Gradience in grammar : experimental and computational aspects of degrees of grammaticality." Thesis, University of Edinburgh, 2001. http://hdl.handle.net/1842/744.

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This thesis deals with gradience in grammar, i.e., with the fact that some linguistic structures are not fully acceptable or unacceptable, but receive gradient linguistic judgments. The importance of gradient data for linguistic theory has been recognized at least since Chomsky's Logical Structure of Linguistic Theory. However, systematic empirical studies of gradience are largely absent, and none of the major theoretical frameworks is designed to account for gradient data. The present thesis addresses both questions. In the experimental part of the thesis (Chapters 3-5), we present a set of m
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18

Alhendal, Yousuf A. "Computational two phase Marangoni flow in a microgravity environment." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/computational-two-phase-marangoni-flow-in-a-microgravity-environment(a3ba6f7f-f619-4bae-a355-e7b007d97e13).html.

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The lack of significant buoyancy effects in zero-gravity conditions poses an issue with fluid transfer in a stagnant liquid. In this thesis, the movement of a bubble or droplet in both stagnant and rotating liquids is analysed and presented numerically using computational fluid dynamics (CFD). The governing continuum conservation equations for two-phase flow are solved using the commercial software package (2011). The Volume of Fluid (VOF) method is used to track the liquid/gas interface in 2D and 3D domains. User-Defined Functions (UDFs) are employed in order to include the effect of surface
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19

Tscherter, Vincent. "Exorciser : Automatic generation and interactive grading of structured excercises in the theory of computation /." Zürich, 2004. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=15654.

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20

von, Stillfried Florian. "Computational fluid-dynamics investigations of vortex generators for flow-separation control." Doctoral thesis, KTH, Turbulens, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-94879.

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Many flow cases in fluid dynamics face undesirable flow separation due to ad-verse pressure gradients on wall boundaries. This occurs, for example, due togeometrical reasons as in a highly curved turbine-inlet duct or on flow-controlsurfaces such as wing trailing-edge flaps within a certain angle-of-attack range.Here, flow-control devices are often used in order to enhance the flow and delayor even totally eliminate flow separation. Flow control can e.g. be achieved byusing passive or active vortex generators (VGs) for momentum mixing in theboundary layer of such flows. This thesis focusses on
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21

Pettersson, Lucas. "Localization with Time-of-Flight cameras." Thesis, KTH, Numerisk analys, NA, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-273788.

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Time-of-Flight (ToF) cameras are becoming an increasingly common sensor in smartphones. These sensors are able to produce depth measurements in a grid at a relatively high rate. Using these depth measurements, point-clouds representing the captured scene can be produced. Previous research has been conducted in using ToF or LIDAR images to localize the camera. In this paper, we investigate several methods to localize the camera using point-clouds and surface meshes. Small alterations were made to some of the algorithms but the concepts remain the same. The main algorithms consisted of ICP varia
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22

Harding, Glen. "Shape from Gradients. A psychophysical and computational study of the role complex illumination gradients, such as shading and mutual illumination, play in three-dimensional shape perception." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/7266.

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The human visual system gathers information about three-dimensional object shape from a wide range of sources. How effectively we can use these sources, and how they are combined to form a consistent and accurate percept of the 3D world is the focus of much research. In complex scenes inter-reflections of light between surfaces (mutual illumination) can occur, creating chromatic illumination gradients. These gradients provide a source of information about 3D object shape, but little research has been conducted into the capabilities of the visual system to use such information. The experiments
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23

Tavares, Jean Leite. "CalibraÃÃo da dispersividade longitudinal de aquÃferos atravÃs do mÃtodo iterativo do gradiente de concentraÃÃo." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13317.

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nÃo hÃ<br>O entendimento de como ocorre o transporte de solutos em Ãguas subterrÃneas à fundamental para o correto gerenciamento deste recurso cada vez mais sujeito a pressÃes antrÃpicas. Para a modelagem deste processo, um parÃmetro fundamental à o coeficiente de dispersÃo hidrodinÃmica, cujo componente mais importante, em meio poroso, à a dispersividade longitudinal (&#945;L). A determinaÃÃo de &#945;L ocorre normalmente atravÃs de experimentos com aplicaÃÃo restrita Ãs Ãreas de interesse e resultados normalmente imprecisos. O presente trabalho teve como objetivo principal calibrar &#945;L e
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24

Van, der Westhuizen Nicolé. "Gradient calculations of non-orthogonal meshes in the finite volume method / N. van der Westhuizen." Thesis, North-West University, 2013. http://hdl.handle.net/10394/9722.

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The handling of gradient calculations on non-orthogonal meshes in the Finite Volume Method (FVM) is important in the modelling of complex geometries, since different implementation methods have an influence on the accuracy and the stability of the solution. The application in the current study is the numerical solution of heat conduction in a complex geometry. It finds relevance in many engineering applications such as the Micro-Channel Heat Exchanger (MCHE) that acts as a recuperator in a High Temperature Reactor (HTR) power generation cycle. A program based on the FVM was developed in Excel
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AZEGAMI, Hideyuki, Akihiro KOKURA, 秀幸 畦上 та 章弘 小倉. "密度を設計変数に用いた形状適合問題の解法". 一般社団法人日本機械学会, 2010. http://hdl.handle.net/2237/21122.

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Truscott, Simon. "A heterogenous three-dimensional computational model for wood drying." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15960/1/Simon_Trustcott_Thesis.pdf.

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The objective of this PhD research program is to develop an accurate and efficient heterogeneous three-dimensional computational model for simulating the drying of wood at temperatures below the boiling point of water. The complex macroscopic drying equations comprise a coupled and highly nonlinear system of physical laws for liquid and energy conservation. Due to the heterogeneous nature of wood, the physical model parameters strongly depend upon the local pore structure, wood density variation within growth rings and variations in primary and secondary system variables. In order to provide
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Truscott, Simon. "A heterogenous three-dimensional computational model for wood drying." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15960/.

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The objective of this PhD research program is to develop an accurate and efficient heterogeneous three-dimensional computational model for simulating the drying of wood at temperatures below the boiling point of water. The complex macroscopic drying equations comprise a coupled and highly nonlinear system of physical laws for liquid and energy conservation. Due to the heterogeneous nature of wood, the physical model parameters strongly depend upon the local pore structure, wood density variation within growth rings and variations in primary and secondary system variables. In order to provide
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28

Weiss, Joseph. "A Solid-State 11B NMR and Computational Study of Boron Electric Field Gradient and Chemical Shift Tensors in Boronic Acids and Boronic Esters." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19737.

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The results of a solid-state 11B NMR study of a series of boronic acids, boronic esters, and boronic acid catechol cyclic esters with aromatic substituents are reported in this thesis. Boron-11 electric field gradient (EFG) and chemical shift (CS) tensors obtained from analyses of spectra acquired in magnetic fields of 9.4 T and 21.1 T are demonstrated to be useful for gaining insight into the molecular and electronic structure about the boron nucleus. It can be concluded that when adequate electronic variation is present in the compounds being studied, Ω is generally the most characteristic b
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Khurelbaatar, Tsolmonbaatar. "Quantitative Imaging and Computational Modelling to Estimate the Relationship between Mechanical Strain and Changes within the Distal Tibia in First-Time Marathon Trainees." Digital WPI, 2019. https://digitalcommons.wpi.edu/etd-theses/1323.

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Background Running is a popular form of exercise that more than 55 million Americans actively participate. Endurance running like marathon and half- marathon is getting increasingly popular among active runners. Although the effect of running is considered beneficial to bone health, the direct relationship between strains and strain gradients occurred during long distance running and bone changes is still not clear. Especially, given a high rate of injury associated with the first-time marathon, understanding the direct effect of strain stimuli on bone health is an important issue. Based on th
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30

PAGLIANA, NICOLO'. "On the Role of Regularization in Machine Learning: Classical Theory, Computational Aspects and Modern Regimes." Doctoral thesis, Università degli studi di Genova, 2022. http://hdl.handle.net/11567/1081700.

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In this work we study performances of different machine learning models by focusing on regularization properties in order to explain different phenomena that are observed in practice. We consider linear models on possibly infinite dimensionale feature space that are trained by optimizing an empirical mean squared errror. We study regularization properties of accelerated method like Nesterov or $ u$-method and properties of interpolating estimator where the main regularization sources vanish to zero and explain different behaviour which can be seen in practical applications.
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31

Attrell, Robert J. "A Solid-State 35Cl and 81Br NMR and Computational Study of Chlorine and Bromine Electric Field Gradient and Chemical Shift Tensors in Haloanilinium Halides." Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20546.

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The results of a systematic 35Cl, 81Br, and 127I SSNMR spectroscopic study of a series of halogen-substituted anilinium halide salts are presented. Solid-state NMR of these nuclides, bromine-/81 and iodine-127 in particular, is not well established. Twenty-one compounds thought to exhibit halogen bonding were prepared based on modified literature procedures, and two crystal structures were solved. Experiments show that collection of SSNMR spectra of the anions is feasible, though ultrahigh magnetic fields (21.1 T) and variable offset data acquisition were found to be essential. Electric fi
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32

Strydom, Willem Jacobus. "Recovery based error estimation for the Method of Moments." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96881.

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Thesis (MEng)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: The Method of Moments (MoM) is routinely used for the numerical solution of electromagnetic surface integral equations. Solution errors are inherent to any numerical computational method, and error estimators can be effectively employed to reduce and control these errors. In this thesis, gradient recovery techniques of the Finite Element Method (FEM) are formulated within the MoM context, in order to recover a higher-order charge of a Rao-Wilton-Glisson (RWG) MoM solution. Furthermore, a new recovery procedure, based spec
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Jiménez, Garay Gabriel Alexandro. "Deep Learning for Semantic Segmentation versus Classification in Computational Pathology: Application to mitosis analysis in Breast Cancer grading." Master's thesis, Pontificia Universidad Católica del Perú, 2019. http://hdl.handle.net/20.500.12404/13969.

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Existing computational pathology approaches did not allow, yet, the emergence of effective/efficient computer-aided tools used as a second opinion for pathologists in the daily practice. Focusing on the case of computer-based qualification for breast cancer diagnosis, the present article proposes two deep learning architectures to efficiently and effectively detect and classify mitosis in a histopathological tissue sample. The first method consisted of two parts, entailing a preprocessing of the digital histological image and a free-handcrafted-feature Convolutional Neural Network (CNN) used f
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34

Iglesias, Susana Marrero. "Simulação e análise de gradientes de tensão em materiais e ligas metálicas." Universidade do Estado do Rio de Janeiro, 2008. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=788.

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As tensões residuais influenciam o comportamento mecânico dos metais e ligas. O campo de tensões pode determinar o desempenho do material. Então, torna-se de grande importância o estudo e a determinação das tensões residuais. O método padrão da difração de raios X para medir tensões s residuais (Método sen2&#968; ) apresenta limitações na determinação de tensões caracterizadas por alto gradiente. È por isso que o estudo do gradiente de tensão superficial é um dos mais importantes problemas teóricos e experimentais em mecânica, especialmente no caso da análise de tensões superficiais que surgem
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35

Portelenelle, Brice. "La méthode LS-STAG avec schémas diamants pour l'approximation de la diffusion : une méthode de type "cut-cell" précise et efficace pour les écoulements incompressibles en géométries 3D complexes." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0136/document.

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La méthode LS-STAG est une méthode cartésienne pour le calcul d’écoulements incompressibles en géométries complexes, qui propose une discrétisation précise des équations de Navier-Stokes dans les cut-cells, cellules polyédriques de forme complexe créées par l’intersection du maillage cartésien avec la frontière du solide immergé. Originalement développée pour les géométries 2D, son extension aux géométries 3D se heurte au défi posé par le grand nombre de types de cut-cells (108) à considérer. Récemment, la méthode LS-STAG a été étendue aux géométries complexes 3D dont la frontière est parallèl
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36

Widdifield, Cory. "Multinuclear Solid-State Magnetic Resonance Studies on ‘Exotic’ Quadrupolar Nuclei: Acquisition Methods, High-Order Effects, Quantum Chemical Computations, and NMR Crystallography." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20722.

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This dissertation attempts to extend the classes of halogen-containing systems which may be studied using solid-state nuclear magnetic resonance (SSNMR). As line shape broadening due to the quadrupolar interaction (QI) scales inversely with the applied field, high-field magnet technology is indispensable for this research. Combining advanced radiofrequency pulse sequences with high-field wideline data acquisition allowed for the collection of very broad SSNMR signals of all quadrupolar halogen nuclei (i.e., 35/37Cl, 79/81Br and 127I) within a reasonable amount of experimental time. The init
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Prost, Jean-Philippe. "Modelling Syntactic Gradience with Loose Constraint-based Parsing." Phd thesis, Université de Provence - Aix-Marseille I, 2008. http://tel.archives-ouvertes.fr/tel-00352828.

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La grammaticalité d'une phrase est habituellement conçue comme une notion binaire : une phrase est soit grammaticale, soit agrammaticale. Cependant, bon nombre de travaux se penchent de plus en plus sur l'étude de degrés d'acceptabilité intermédiaires, auxquels le terme de gradience fait parfois référence. À ce jour, la majorité de ces travaux s'est concentrée sur l'étude de l'évaluation humaine de la gradience syntaxique. Cette étude explore la possibilité de construire un modèle robuste qui s'accorde avec ces jugements humains.<br>Nous suggérons d'élargir au langage mal formé les concepts de
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38

Zhang, Meng. "Evolutionary Learning of Boosted Features for Visual Inspection Automation." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7324.

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Feature extraction is one of the major challenges in object recognition. Features that are extracted from one type of objects cannot always be used directly for a different type of objects, therefore limiting the performance of feature extraction. Having an automatic feature learning algorithm could be a big advantage for an object recognition algorithm. This research first introduces several improvements on a fully automatic feature construction method called Evolution COnstructed Feature (ECO-Feature). These improvements are developed to construct more robust features and make the training p
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39

Tavares, Paulo Roberto Lacerda. "Modelagem computacional e calibraÃÃo da condutividade hidrÃulica horizontal em aqÃÃfero da Bacia Sedimentar do Araripe utilizando o mÃtodo iterativo do gradiente hidrÃulico." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=4517.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>O processo de calibraÃÃo de parÃmetros hidrodinÃmicos representa parte importante dos modelos e sua abordagem geral consiste em minimizar uma funÃÃo objetivo expressa pela diferenÃa entre as cargas hidrÃulicas observadas e calculadas. Guo e Zhang, na dÃcada de 90 e, depois, Schuster e AraÃjo (2004) propuseram um processo alternativo para estimaÃÃo dos parÃmetros, atravÃs da minimizaÃÃo da diferenÃa entre os gradientes hidrÃulicos observados e calculados e denominado MÃtodo Iterativo do Gradiente HidrÃulico (MIGH). A geraÃÃo da ma
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40

畔上, 秀幸, Hideyuki Azegami, 志強 呉 та Zhi Chang Wu. "線形弾性問題における領域最適化解析（力法によるアプローチ）". 日本機械学会, 1994. http://hdl.handle.net/2237/7239.

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AZEGAMI, Hideyuki, and Zhi Chang WU. "Domain Optimization Analysis in Linear Elastic Problems (Approach Using Traction Method)." 日本機械学会, 1996. http://hdl.handle.net/2237/12156.

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42

Ozturk, Tugce. "Experimental and Computational Investigation of the Microstructure-Mechanical Deformation Relationship in Polycrystalline Materials, Applied to Additively Manufactured Titanium Alloys." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/900.

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Parts made out of titanium alloys demonstrate anisotropic mechanical properties when manufactured by electron beam melting, an emerging additive manufacturing technique. Understanding the process history dependent heterogeneous microstructure, and its effect on mechanical properties is crucial in determining the performance of additively manufactured titanium alloys as the mechanical behavior heavily relies on the underlying microstructural features. This thesis work focuses on combined experimental and computational techniques for microstructure characterization, synthetic microstructure gene
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43

Cai, Shang-Gui. "Computational fluid-structure interaction with the moving immersed boundary method." Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2276/document.

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Dans cette thèse, une nouvelle méthode de frontières immergées a été développée pour la simulation d'interaction fluide-structure, appelée la méthode de frontières immergées mobiles (en langage anglo-saxon: MIBM). L'objectif principal de cette nouvelle méthode est de déplacer arbitrairement les solides à géométrie complexe dans un fluide visqueux incompressible, sans remailler le domaine fluide. Cette nouvelle méthode a l'avantage d'imposer la condition de non-glissement à l'interface d'une manière exacte via une force sans introduire des constantes artificielles modélisant la structure rigide
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Aklil, Nassim. "Apprentissage actif sous contrainte de budget en robotique et en neurosciences computationnelles. Localisation robotique et modélisation comportementale en environnement non stationnaire." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066225/document.

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La prise de décision est un domaine très étudié en sciences, que ce soit en neurosciences pour comprendre les processus sous tendant la prise de décision chez les animaux, qu’en robotique pour modéliser des processus de prise de décision efficaces et rapides dans des tâches en environnement réel. En neurosciences, ce problème est résolu online avec des modèles de prises de décision séquentiels basés sur l’apprentissage par renforcement. En robotique, l’objectif premier est l’efficacité, dans le but d’être déployés en environnement réel. Cependant en robotique ce que l’on peut appeler le budget
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畔上, 秀幸, та Hideyuki Azegami. "領域最適化問題の一解法". 日本機械学会, 1994. http://hdl.handle.net/2237/7238.

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Brundin, Michelle, Peter Morris, Gustav Åhlman, and Emil Rosén. "Implementation av webbsida för rekommendationssystem med användaruppbyggd databas." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-175489.

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The goal of this project was to create a web-based, crowd-sourced, correlational database, that easily allowed users to submit objects and receive correlated objects as results. The webservice was created in the web development languages of HTML, CSS, PHP and Javscript, with MySQL to handle the database. Simultaneous development was kept in check with the aid of the source code management system GIT. Upon completion, the service contained several HTML-views, the ability to add and rate objects, a per-object dedicated page with information parsed from Wikipedia.org, and a view with objects rank
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Berguin, Steven Henri. "A method for reducing dimensionality in large design problems with computationally expensive analyses." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53504.

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Strides in modern computational fluid dynamics and leaps in high-power computing have led to unprecedented capabilities for handling large aerodynamic problem. In particular, the emergence of adjoint design methods has been a break-through in the field of aerodynamic shape optimization. It enables expensive, high-dimensional optimization problems to be tackled efficiently using gradient-based methods in CFD; a task that was previously inconceivable. However, adjoint design methods are intended for gradient-based optimization; the curse of dimensionality is still very much alive when it comes t
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Masoudi, Mohammad Amin. "Robust Deep Reinforcement Learning for Portfolio Management." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42743.

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In Finance, the use of Automated Trading Systems (ATS) on markets is growing every year and the trades generated by an algorithm now account for most of orders that arrive at stock exchanges (Kissell, 2020). Historically, these systems were based on advanced statistical methods and signal processing designed to extract trading signals from financial data. The recent success of Machine Learning has attracted the interest of the financial community. Reinforcement Learning is a subcategory of machine learning and has been broadly applied by investors and researchers in building trading systems (K
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ElNady, Khaled. "Modèles de comportement non linéaire des matériaux architecturés par des méthodes d'homogénéisation discrètes en grandes déformations. Application à des biomembranes et des textiles." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0032/document.

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Ce travail porte sur le développement de modèles micromécaniques pour le calcul de la réponse homogénéisée de matériaux architecturés, en particulier des matériaux se présentant sous forme de treillis répétitifs. Les matériaux architecturés et micro-architecturés couvrent un domaine très large de de propriétés mécaniques, selon la connectivité nodale, la disposition géométrique des éléments structuraux, leurs propriétés mécaniques, et l'existence d'une possible hiérarchie structurale. L'objectif principal de la thèse est la prise en compte des nonlinéarités géométriques résultant des évolution
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Van, Den Eijnden Bram. "Modélisation multi-échelle du comportement hydro-méchanique des roches argileuses." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI034/document.

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Les études de faisabilité concernant le stockage géologique profond des déchets radioactifs ont conduit un intérêt accru concernant la modélisation géomécanique de la roche hte. En France, une roche hte potentielle est l'argilite du Callovo-Oxfordien du site de Meuse/Haute Marne. Etant donné que le principe de stockage géologique profond repose fortement sur la capacité de confinement de la formation hte, sa faible perméabilité est d'une importance clé. La perméabilité étant dépendante de la microstructure du matériau et de son évolution sous chargement, le comportement couplé hydro-mécanique
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