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Dissertations / Theses on the topic 'Multi-splitting'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Wood, William Alfred. "Multi-dimensional Upwind Fluctuation Splitting Scheme with Mesh Adaption for Hypersonic Viscous Flow." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/29772.

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A multi-dimensional upwind fluctuation splitting scheme is developed and implemented for two-dimensional and axisymmetric formulations of the Navier-Stokes equations on unstructured meshes. Key features of the scheme are the compact stencil, full upwinding, and non-linear discretization which allow for second-order accuracy with enforced positivity. Throughout, the fluctuation splitting scheme is compared to a current state-of-the-art finite volume approach, a second-order, dual mesh upwind flux difference splitting scheme (DMFDSFV), and is shown to produce more accurate results using fewer co

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2

Cowen, Benjamin E. "Bregman Operator Splitting with Variable Stepsize for TotalGeneralized Variation Based Multi-Channel MRIReconstruction." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1433176806.

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3

Li, Zheng. "Interference mitigation for broadcast channels Rate Splitting for Multi- Antenna Downlink: Precoder Design and Practical Implementation On Linearly Precoded Rate Splitting for MIMO Broadcast Channels." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASC026.

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Cette thèse explore plusieurs schémas de transmission pour l’atténuation des interférences dans les BCs, sous certains paramètres réalistes. La première partie de la thèse traite des performances des BCs avec les CSITs mixtes. L’objectif est de découvrir comment exploiter simultanément les retours fiables et les CSIs non fiables. Un schéma de transmission pour un nombre arbitraire d’utilisateurs est proposé, et est prouvé optimal pour les EBCs à deux utilisateurs. Les améliorations des débits par le schéma proposé sont également présentées dans les EBCs à K utilisateurs. Les principaux ingrédi

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4

Chrysler, Benjamin D., Pelaez Silvana Ayala, Raymond K. Kostuk, and Yuechen Wu. "Design and optimization of cascaded DCG based holographic elements for spectrum-splitting PV systems." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/626491.

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In this work, the technique of designing and optimizing broadband volume transmission holograms using dichromate gelatin (DCG) is summarized for solar spectrum-splitting application. Spectrum splitting photovoltaic system uses a series of single bandgap PV cells that have different spectral conversion efficiency properties to more fully utilize the solar spectrum. In such a system, one or more high performance optical filters are usually required to split the solar spectrum and efficiently send them to the corresponding PV cells. An ideal spectral filter should have a rectangular shape with sh

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5

Partimbene, Vincent. "Calcul haute performance pour la simulation d'interactions fluide-structure." Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/20524/1/PARTIMBENE_Vincent.pdf.

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Cette thèse aborde la résolution des problèmes d'interaction fluide-structure par un algorithme consistant en un couplage entre deux solveurs : un pour le fluide et un pour la structure. Pour assurer la cohérence entre les maillages fluide et structure, on considère également une discrétisation de chaque domaine par volumes finis. En raison des difficultés de décomposition du domaine en sous-domaines, nous considérons pour chaque environnement un algorithme parallèle de multi-splitting (ou multi-décomposition) qui correspond à une présentation unifiée des méthodes de sous-domaines avec ou sans

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6

Shahraei, Ali Verfasser], Ulrike [Akademischer Betreuer] [Kramm, and Jin [Akademischer Betreuer] Suntivich. "Investigation of the water splitting reactions on multi-heteroatom doped cobalt-based carbon catalysts / Ali Shahraei ; Ulrike I. Kramm, Jin Suntivich." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2018. http://d-nb.info/1171426461/34.

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7

Shahraei, Ali [Verfasser], Ulrike [Akademischer Betreuer] Kramm, and Jin [Akademischer Betreuer] Suntivich. "Investigation of the water splitting reactions on multi-heteroatom doped cobalt-based carbon catalysts / Ali Shahraei ; Ulrike I. Kramm, Jin Suntivich." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2018. http://d-nb.info/1171426461/34.

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8

Wu, Yuechen, Shelby Vorndran, Pelaez Silvana Ayala, and Raymond K. Kostuk. "Three junction holographic micro-scale PV system." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622714.

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In this work a spectrum splitting micro-scale concentrating PV system is evaluated to increase the conversion efficiency of flat panel PV systems. In this approach, the dispersed spectrum splitting concentration systems is scaled down to a small size and structured in an array. The spectrum splitting configuration allows the use of separate single bandgap PV cells that increase spectral overlap with the incident solar spectrum. This results in an overall increase in the spectral conversion efficiency of the resulting system. In addition other benefits of the micro-scale PV system are retained

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9

Sutula, Danas. "Energy minimising multi-crack growth in linear-elastic materials using the extended finite element method with application to Smart-Cut™ silicon wafer splitting." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/95561/.

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We investigate multiple crack evolution under quasi-static conditions in an isotropic linear-elastic solid based on the principle of minimum total energy, i.e. the sum of the potential and fracture energies, which stems directly from the Griffith’s theory of cracks. The technique, which has been implemented within the extended finite element method, enables minimisation of the total energy of the mechanical system with respect to the crack extension directions. This is achieved by finding the orientations of the discrete crack-tip extensions that yield vanishing rotational energy release rates

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10

Duarte, Max Pedro. "Méthodes numériques adaptives pour la simulation de la dynamique de fronts de réaction multi-échelle en temps et en espace." Phd thesis, Ecole Centrale Paris, 2011. http://tel.archives-ouvertes.fr/tel-00737092.

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Nous abordons le développement d'une nouvelle génération de méthodes numériques pour la résolution des EDP évolutives qui modélisent des phénomènes multi-échelles en temps et en espace issus de divers domaines applicatifs. La raideur associée à ce type de problème, que ce soit via le terme source chimique qui présente un large spectre d'échelles de temps caractéristiques ou encore via la présence de fort gradients très localisés associés aux fronts de réaction, implique en général de sévères difficultés numériques. En conséquence, il s'agit de développer des méthodes qui garantissent la précis

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11

Randström, Monica. "Deltack, Blanket Study." Thesis, Högskolan Dalarna, Grafisk teknik, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:du-3537.

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There are two objectives of this study.The first one was to study the new instrument Deltack fromPrufbau, and with the new knowledge, study the interaction between blanket and paper.Deltack is a new instrument to measure the ink splitting force. Blankets from an earlier study doneby GATF have been montered on 12 different Deltack print forms and those have together with Deltackbeen the base for this project.This study together with information from GATF’s study shows that some of the blankets have ahigher capability to adsorb ink. Those blankets generate a sharper shape on the force curve, the

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12

Garrigos, Guillaume. "Descent dynamical systems and algorithms for tame optimization, and multi-objective problems." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS191/document.

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Dans une première partie, nous nous intéressons aux systèmes dynamiques gradients gouvernés par des fonctions non lisses, mais aussi non convexes, satisfaisant l'inégalité de Kurdyka-Lojasiewicz. Après avoir obtenu quelques résultats préliminaires pour la dynamique de la plus grande pente continue, nous étudions un algorithme de descente général. Nous prouvons, sous une hypothèse de compacité, que tout suite générée par ce schéma général converge vers un point critique de la fonction. Nous obtenons aussi de nouveaux résultats sur la vitesse de convergence, tant pour les valeurs que pour les it

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13

Tang, Kunkun. "Combining Discrete Equations Method and Upwind Downwind-Controlled Splitting for Non-Reacting and Reacting Two-Fluid Computations." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00819824.

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Lors que nous examinons numériquement des phénomènes multiphasiques suite à un accidentgrave dans le réacteur nucléaire, la dimension caractéristique des zones multi-fluides(non-réactifs et réactifs) s'avère beaucoup plus petite que celle du bâtiment réacteur, cequi fait la Simulation Numérique Directe de la configuration à peine réalisable. Autrement,nous proposons de considérer la zone de mélange multiphasique comme une interface infinimentfine. Puis, le solveur de Riemann réactif est inséré dans la Méthode des ÉquationsDiscrètes Réactives (RDEM) pour calculer le front de combustion à grande

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14

Hameed, Khalid W. H. "Multiuser Multi Input Single Output (MU-MISO) Beamforming for 5G Wireless and Mobile Networks. A Road Map for Fast and Low Complexity User Selection, Beamforming Scheme Through a MU-MISO for 5G Wireless and Mobile Networks." Thesis, University of Bradford, 2019. http://hdl.handle.net/10454/18445.

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Multi-User Multi-Input Multi-Output (MU-MIMO) systems are considered to be the sustainable technologies of the current and future of the upcoming wireless and mobile networks generations. The perspectives of these technologies under several scenarios is the focus of the present thesis. The initial system model covers the MU-MIMO, especially in the massive form that is considered to be the promising ideas and pillars of the 5G network. It is observed that the optimal number of users should be served in the time-frequency resource even though the maximum limitation of the MU-MIMO is governed

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15

Jacquemart, Damien. "Contributions aux méthodes de branchement multi-niveaux pour les évènements rares, et applications au trafic aérien." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S186/document.

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La thèse porte sur la conception et l'analyse mathématique de méthodes de Monte Carlo fiables et précises pour l'estimation de la (très petite) probabilité qu'un processus de Markov atteigne une région critique de l'espace d'état avant un instant final déterministe. L'idée sous-jacente aux méthodes de branchement multi-niveaux étudiées ici est de mettre en place une suite emboitée de régions intermédiaires de plus en plus critiques, de telle sorte qu'atteindre une région intermédiaire donnée sachant que la région intermédiaire précédente a déjà été atteinte, n'est pas si rare. En pratique, les

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16

Laborde, Maxime. "Systèmes de particules en interaction, approche par flot de gradient dans l'espace de Wasserstein." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLED014/document.

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Depuis l’article fondateur de Jordan, Kinderlehrer et Otto en 1998, il est bien connu qu’une large classe d’équations paraboliques peuvent être vues comme des flots de gradient dans l’espace de Wasserstein. Le but de cette thèse est d’étendre cette théorie à certaines équations et systèmes qui n’ont pas exactement une structure de flot de gradient. Les interactions étudiées sont de différentes natures. Le premier chapitre traite des systèmes avec des interactions non locales dans la dérive. Nous étudions ensuite des systèmes de diffusions croisées s’appliquant aux modèles de congestion pour pl

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17

Jegourel, Cyrille. "Rare event simulation for statistical model checking." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S084/document.

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Dans cette thèse, nous considérons deux problèmes auxquels le model checking statistique doit faire face. Le premier concerne les systèmes hétérogènes qui introduisent complexité et non-déterminisme dans l'analyse. Le second problème est celui des propriétés rares, difficiles à observer et donc à quantifier. Pour le premier point, nous présentons des contributions originales pour le formalisme des systèmes composites dans le langage BIP. Nous en proposons une extension stochastique, SBIP, qui permet le recours à l'abstraction stochastique de composants et d'éliminer le non-déterminisme. Ce dou

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18

THELAPURATH, SHRINATH. "DESIGN OF HEURISTICS FOR CONGESTION CONTROL IN 3-DIMENSIONAL ROUTING FOR MULTI-CHIP MODULES." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin981478715.

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19

Sala, Lorenzo. "Modélisation mathématique et simulation de flux sanguins oculaires et leur interactions." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAD021.

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Les neuropathies optiques comme le glaucome sont souvent des maladies tardives, évolutives et incurables. Malgré les progrès récents de la recherche clinique, de nombreuses questions relatives à l’étiologie de ces troubles et à leur physiopathologie restent ouvertes. De plus, les données sur les tissus postérieurs oculaires sont difficiles à estimer de façon non invasive et leur interprétation clinique demeure difficile en raison de l’interaction entre de multiples facteurs qui ne peuvent pas être facilement isolés. L’utilisation récente de modèles mathématiques pour des problèmes biomédicaux

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20

Buddhakulsomsiri, Jirachai. "Multi-mode resource-constrained project scheduling problem with resource vacations and task splitting." Thesis, 2003. http://hdl.handle.net/1957/31495.

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The research presented in this dissertation addresses the Multi-Mode Resource-Constrained Project Scheduling Problem (MMRCPSP) in the presence of resource unavailability. This research is motivated by the scheduling of engineering design tasks in automotive product development to minimize the project completion time, but addresses a general scheduling situation that is applicable in many contexts. The current body of MMRCPSP research typically assumes that, 1) individual resource units are available at all times when assigning tasks to resources and, 2) before assigning tasks to resources, the

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21

Lee, Wei-Lun, and 李偉倫. "Directional-Coupler-Based Polarization Splitting in Asymmetric Metal/Multi-Insulator Configuration for Optical Nanocircuitry." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/25255571923920438718.

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碩士<br>國立中央大學<br>光電科學研究所<br>100<br>This thesis described the design and analysis of a novel directional-coupler-based polarization splitter for optical nanocircuitry in two-dimensional (2-D) asymmetric metal/multi-insulator configuration. The design and optimization of the proposed device are conducted using 2-D finite-element-based numerical simulations while modified coupled-mode theory for lossy parallel waveguides is developed as the mathematical background of this research. The introduction of silver region in asymmetric air/silicon/silica waveguide is shown to not only enhance the field c

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22

Shahraei, Ali. "Investigation of the water splitting reactions on multi-heteroatom doped cobalt-based carbon catalysts." Phd thesis, 2018. https://tuprints.ulb.tu-darmstadt.de/8171/13/2018-11-13_Thesis.pdf.

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In the context of energy transition, hydrogen is addressed as a clean future energy carrier that enables the emission-free production of energy to become independent of fossil fuels. The development of hydrogen production technologies like the electrolysis is strongly driven by the two main criteria: sustainability and economy. Over the past decades, various technological achievements resulted in a reduction of costs which has dramatically improved the economic potential of hydrogen produced by electrolysis. Especially in the field of material development, great effort was devoted to replace t

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23

Wu, Tsung-Tien, and 吳宗典. "A Heuristic Lot-Splitting Model for Multi-Products in a Flexible Flow Shop System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/40621337068184834487.

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碩士<br>國立屏東科技大學<br>工業管理系所<br>95<br>The globalization competition age has already come, and the industry supply chain is close to hinge upon mutually. The globalization competition brings for the challenges of quick response and customization that make to turn. In order to quickly produce different products required by customers, manufacturers all focus on developing diversified products and shorting production time. Therefore, in this research, taking turning the least makespan as a target by using the lot splitting technique to make the process of splitting a given lot or job to allow the over

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24

Rashid, Faraan. "Low-Feedback Opportunistic Scheduling Schemes for Wireless Networks with Heterogenous Users." Thesis, 2012. http://hdl.handle.net/10754/237211.

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Efficient implementation of resource sharing strategies in a multi-user wireless environment can improve the performance of a network significantly. In this thesis we study various scheduling strategies for wireless networks and handle the problem of opportunistically scheduling transmissions using channel aware schemes. First we propose a scheme that can handle users with asymmetric channel conditions and is opportunistic in the sense that it exploits the multi-user diversity of the network. The scheme requires the users to have a priori knowledge of their channel distributions. The associate

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25

Chang, Shao-Yung, and 張韶詠. "Lot-Splitting for Reentrant of Multi-Products Flow Shop System: A Case Study of H Company." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/74791683506567767627.

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碩士<br>南台科技大學<br>行銷與流通管理系<br>97<br>The lot-splitting for reentrant of multi-products flow shop system is a combination of traditional scheduling and the lot-streaming problem. Because of the products in the production process are not necessarily all the same, so the processing of the product processing will be differences. Therefore, Multi-Products flow shop problem will become more complex. This study focused on the multi-products production processes and to consider a reentrant of batch splitting problem and to minimize the total completion time. Power Supply in the processing, the products

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26

Mahadevan, Vijay Subramaniam. "High Resolution Numerical Methods for Coupled Non-linear Multi-physics Simulations with Applications in Reactor Analysis." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8579.

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The modeling of nuclear reactors involves the solution of a multi-physics problem with widely varying time and length scales. This translates mathematically to solving a system of coupled, non-linear, and stiff partial differential equations (PDEs). Multi-physics applications possess the added complexity that most of the solution fields participate in various physics components, potentially yielding spatial and/or temporal coupling errors. This dissertation deals with the verification aspects associated with such a multi-physics code, i.e., the substantiation that the mathematical description

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27

(6259343), Xiaodong Hou. "Distributed Solutions for a Class of Multi-agent Optimization Problems." Thesis, 2019.

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Distributed optimization over multi-agent networks has become an increasingly popular research topic as it incorporates many applications from various areas such as consensus optimization, distributed control, network resource allocation, large scale machine learning, etc. Parallel distributed solution algorithms are highly desirable as they are more scalable, more robust against agent failure, align more naturally with either underlying agent network topology or big-data parallel computing framework. In this dissertation, we consider a multi-agent optimization formulation where the global obj

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