Relevant bibliographies by topics / Directions of optimization / Dissertations / Theses
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Dissertations / Theses on the topic 'Directions of optimization'

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Published: 2 June 2025
Last updated: 31 July 2025

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1

Al-Jeiroudi, Ghussoun. "On inexact Newton directions in interior point methods for linear optimization." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3863.

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In each iteration of the interior point method (IPM) at least one linear system has to be solved. The main computational effort of IPMs consists in the computation of these linear systems. Solving the corresponding linear systems with a direct method becomes very expensive for large scale problems. In this thesis, we have been concerned with using an iterative method for solving the reduced KKT systems arising in IPMs for linear programming. The augmented system form of this linear system has a number of advantages, notably a higher degree of sparsity than the normal equations form. We design
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2

Ganguly, Sandipan. "Algorithmic Modifications to a Multidisciplinary Design Optimization Model of Containerships." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/32483.

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When designing a ship, a designer often begins with â an ideaâ of what the ship might look like and what specifications the ship should meet. The multidisciplinary design optimization model is a tool that combines an analysis and an optimization process and uses a measure of merit to obtain what it infers to be the best design. All that the designer has to know is the range of values of certain design variables that confine the design within a lower and an upper bound. The designer then feeds the MDO model with any arbitrary design within the bounds and the model searches for the best desig
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Lê-Huu, Dien Khuê. "Nonconvex Alternating Direction Optimization for Graphs : Inference and Learning." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC005/document.

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Cette thèse présente nos contributions àl’inférence et l’apprentissage des modèles graphiquesen vision artificielle. Tout d’abord, nous proposons unenouvelle classe d’algorithmes de décomposition pour résoudrele problème d’appariement de graphes et d’hypergraphes,s’appuyant sur l’algorithme des directionsalternées (ADMM) non convexe. Ces algorithmes sontefficaces en terme de calcul et sont hautement parallélisables.En outre, ils sont également très générauxet peuvent être appliqués à des fonctionnelles d’énergiearbitraires ainsi qu’à des contraintes de correspondancearbitraires. Les expérience
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Mitradjieva-Daneva, Maria. "Feasible Direction Methods for Constrained Nonlinear Optimization : Suggestions for Improvements." Doctoral thesis, Linköping : Department of Mathematics, Linköping University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8811.

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Högdahl, Johan. "Conditional steepest descent directions over Cartesian product sets : With application to the Frank-Wolfe method." Thesis, Linköpings universitet, Optimeringslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-123730.

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We derive a technique for scaling the search directions of feasible direction methods when applied to optimization problems over Cartesian product sets. It is proved that when the scaling is included in a convergent feasible direction method, also the new method will be convergent. The scaling technique is applied to the Frank-Wolfe method, the partanized Frank-Wolfe method and a heuristic Frank-Wolfe method. The performance of  these algorithms with and without scaling is evaluated on the stochastic transportation problem. It is found that the scaling technique has the ability to improve the
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Zou, Weiyao. "OPTIMIZATION OF ZONAL WAVEFRONT ESTIMATION AND CURVATURE MEASUREMENTS." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4134.

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Optical testing in adverse environments, ophthalmology and applications where characterization by curvature is leveraged all have a common goal: accurately estimate wavefront shape. This dissertation investigates wavefront sensing techniques as applied to optical testing based on gradient and curvature measurements. Wavefront sensing involves the ability to accurately estimate shape over any aperture geometry, which requires establishing a sampling grid and estimation scheme, quantifying estimation errors caused by measurement noise propagation, and designing an instrument with sufficient accu
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Podola, Adam. "Mobilní aplikace - bezbariérové trasy v rámci centra města." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2017. http://www.nusl.cz/ntk/nusl-363781.

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This diploma thesis describes the fundamentals of the Android framework for the future development of mobile applications. The reader will be introduced to existing applications for the support of physically disabled people. It will also describe the design and implementation of a new mobile application, displaying information on selected buildings and giving the possibility of marking obstacles in the public space near the city centre of Brno. Finally, the principle of the chosen procedure of finding potentially barrier-free routes, during which the state of the obstacle database is taken int
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Ranaivomiarana, Narindra. "Simultaneous optimization of topology and material anisotropy for aeronautic structures." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS653.

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Ce travail de thèse s'inscrit dans le cadre de l'allègement des structures aéronautiques. Dans cette optique, d'une part, l’optimisation topologique est une approche pertinente et en plein essor, celle-ci détermine la distribution optimale de matière. D'autre part, les matériaux anisotropes offrent des nouveaux degrés de liberté pour l'optimisation. L’objectif de cette thèse est de développer une méthode d'optimisation permettant de déterminer simultanément la distribution de matière et la distribution d’anisotropie optimales d’une structure 3D utilisant un matériau isotrope transverse. Pour c
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Jankauskienė, Eglė. "IKIMOKYKLINIŲ UGDYMO ĮSTAIGŲ VALDYMO OPTIMIZAVIMO STRATEGINĖS KRYPTYS." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080926_181414-84880.

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Ši pagrindinė tezė apima teorinę ir praktinę pusę, analizę ir ikimokyklinių ugdymo įstaigų valdymo optimizavimo strateginių tikslų pagrindimą. Tezė apima: strateginio valdymo teorijos analizę, tam tikrų segmentų empirinį viešos nuomonės tyrimą (ikimokyklinių ugdymo įstaigų direktorių, pavaduotojų, auklėtojų, tėvų), jų nuomones apie ikimokyklinių ugdymo įstaigų valdymo optimizacijos strateginius tikslus, empirinį vadovavimo įvertinimo tyrimą apie dabartinių vaikų darželių direktorius, patikrinant jų gebėjimą vadovauti. Buvo apklausta trisdešimt Šiaulių miesto ir rajono ikimokyklinių ugdymo įsta
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Holmgren, Johan. "Efficient Updating Shortest Path Calculations for Traffic Assignment." Thesis, Linköping University, Department of Mathematics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2573.

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<p>Traffic planning in a modern congested society is an important and time consuming procedure. Finding fast algorithms for solving traffic problems is therefore of great interest for traffic planners allover the world. </p><p>This thesis concerns solving the fixed demand traffic assignment problem (TAP) on a number of different transportation test networks. TAP is solved using the Frank-Wolfe algorithm and the shortest path problems that arise as subproblems to the Frank-Wolfe algorithm are solved using the network simplex algorithm. We evaluate how a number of existing pricing strategies to
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Chen, Zhouye. "Reconstruction of enhanced ultrasound images from compressed measurements." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30222/document.

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L'intérêt de l'échantillonnage compressé dans l'imagerie ultrasonore a été récemment évalué largement par plusieurs équipes de recherche. Suite aux différentes configurations d'application, il a été démontré que les données RF peuvent être reconstituées à partir d'un faible nombre de mesures et / ou en utilisant un nombre réduit d'émission d'impulsions ultrasonores. Selon le modèle de l'échantillonnage compressé, la résolution des images ultrasonores reconstruites à partir des mesures compressées dépend principalement de trois aspects: la configuration d'acquisition, c.à.d. l'incohérence de la
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Fernandes, Camila de Freitas. "NFDNA - um algoritmo para otimização não convexa e não diferenciável." Universidade Federal de Juiz de Fora, 2016. https://repositorio.ufjf.br/jspui/handle/ufjf/1837.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-06-16T17:52:10Z No. of bitstreams: 1 camiladefreitasfernandes.pdf: 740367 bytes, checksum: fac5ab7dcb039b31d587151b9a53fab1 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-07-13T14:25:13Z (GMT) No. of bitstreams: 1 camiladefreitasfernandes.pdf: 740367 bytes, checksum: fac5ab7dcb039b31d587151b9a53fab1 (MD5)<br>Made available in DSpace on 2016-07-13T14:25:13Z (GMT). No. of bitstreams: 1 camiladefreitasfernandes.pdf: 740367 bytes, checksum: fac5ab7dcb039b31d587151b9a53fab1 (MD5) Pr
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Ozaydin, Seval. "Optimization Of The Array Geometry For Direction Finding." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/2/1093012/index.pdf.

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In this thesis, optimization of the geometry of non-uniform arrays for direction finding yielding unambiguous results is studied. A measure of similarity between the array response vectors is defined. In this measure, the effects of antenna array geometry, source placements and antenna gains are included as variable parameters. Then, assuming that the antenna gains are known and constant, constraints on the similarity function are developed and described to result in unambiguous configurations and maximum resolution. The problem stated is solved with two different methods, the MATLAB optimizat
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Fonseca, Erasmo Tales. "FDIPA - algoritmo de pontos interiores e direções viáveis para otimização não-linear diferenciável: um estudo de parâmetros." Universidade Federal de Juiz de Fora, 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/1308.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-04-28T17:57:49Z No. of bitstreams: 1 erasmotalesfonseca.pdf: 866120 bytes, checksum: 042a0c3210df8046171b1593162cde44 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-05-02T01:13:24Z (GMT) No. of bitstreams: 1 erasmotalesfonseca.pdf: 866120 bytes, checksum: 042a0c3210df8046171b1593162cde44 (MD5)<br>Made available in DSpace on 2016-05-02T01:13:24Z (GMT). No. of bitstreams: 1 erasmotalesfonseca.pdf: 866120 bytes, checksum: 042a0c3210df8046171b1593162cde44 (MD5) Previous issue date:
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O'Neal, Jerome W. "The use of preconditioned iterative linear solvers in interior-point methods and related topics." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-06242005-162854/.

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Thesis (Ph. D.)--Industrial and Systems Engineering, Georgia Institute of Technology, 2006.<br>Parker, R. Gary, Committee Member ; Shapiro, Alexander, Committee Member ; Nemirovski, Arkadi, Committee Member ; Green, William, Committee Member ; Monteiro, Renato, Committee Chair.
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16

Zhang, Kaining. "Quantum Algorithm for Finding the Negative Curvature Direction." Thesis, The University of Sydney, 2019. https://hdl.handle.net/2123/21740.

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Non-convex optimization is an essential problem in the field of machine learning. Optimization methods for non-convex problems can be roughly di- vided into first-order methods and second-order methods, depending on the or- der of the derivative to the objective function they used. Generally, to find the local minima, the second-order methods are applied to find the effective direction to escape the saddle point. Specifically, finding the Negative Curvature is considered as the subroutine to analyze the characteristic of the saddle point. However, the calculation of the Negative Curvature is e
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17

Mesturini, Davide, Cesare Dolcin, Ulderico Busani, Pietro Marani, Antonella Bonavolonta, and Emma Frosina. "Optimization of directional control valves through downstream compensation approach." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71195.

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Various academic studies show that in the use of common ICE Off-road Vehicles only about 10-15% of the available power at fuel level is actually transformed into useful energy for the actuators. Particularly the Directional Control Valves are responsible for the dissipation of about 35-40% of the hydraulic energy available at the pump level. The machine electrification trend makes it even more urgent to optimize the hydraulic system to ensure greater performance and higher battery autonomy. Traditional Directional Control Valves design solutions neglect important opportunities for reducing los
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18

Christopher, Ryan M. "OPTIMIZATION OF SYMBOL DISTANCE METRIC IN DIRECTIONAL MODULATION SYSTEMS." International Foundation for Telemetering, 2016. http://hdl.handle.net/10150/624230.

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This paper investigates a directional modulation (DM) method that distorts the received symbol constellations along a set of undesired directions while maintaining an undistorted constellation in the direction of intended communications. The problem is formulated in terms of minimization of the symbol distance metrics along the undesired directions. An algorithm assigns a symbol pair to each undesired direction for symbol distance minimization. Constraints for good reception in the desired direction are also included. The method involves iterations between a quadratic minimization problem
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19

Raihen, Nurul. "Convergence Rates for Hestenes' Gram-Schmidt Conjugate Direction Methodwithout Derivatives in Numerical Optimization." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1494608232437057.

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20

Birinci, Toygar. "Optimization Of Non-uniform Planar Array Geometry For Direction Of Arrival Estimation." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607396/index.pdf.

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In this work, a novel method is proposed to optimize the array geometry for DOA estimation. The method is based on minimization of fine error variances with the constraint that the gross error probability is below a certain threshold. For this purpose, a metric function that reflects the gross and fine error characteristics of the array is offered. Theoretical analyses show that the minimization of this metric function leads to small DOA estimation error variance and small gross error probability. Analyses have been carried out under the assumptions of planar array geometry, isotropic array el
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Siegel, Dirk. "The use of conjugate direction matrices in quasi-Newton methods for nonlinear optimization." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335112.

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Burrell, Tina R. "An alternating direction search algorithm for low dimensional optimization : an application to power flow /." This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-12162009-020216/.

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23

Aremu, Adedeji. "Topology optimization for additive manufacture." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12833.

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Additive manufacturing (AM) offers a way to manufacture highly complex designs with potentially enhanced performance as it is free from many of the constraints associated with traditional manufacturing. However, current design and optimisation tools, which were developed much earlier than AM, do not allow efficient exploration of AM's design space. Among these tools are a set of numerical methods/algorithms often used in the field of structural optimisation called topology optimisation (TO). These powerful techniques emerged in the 1980s and have since been used to achieve structural solutions
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Burrell, Tinal R. "An alternating direction search algorithm for low dimensional optimization: an application to power flow." Thesis, Virginia Tech, 1993. http://hdl.handle.net/10919/46240.

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Presented in this paper is a scheme for minimizing the cost function of a three-source technique to arrive at an approximation point (I,J) that is within one unit of the true minimum. The Line-Step algorithm is applied to several systems and is also compared to other minimization techniques, including the Equal Incremental Loss Algorithm. Variations are made on the Line-Step Algorithm for faster convergence and also to handle inequality constraints.<br>Master of Science
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Hai, Xin Flowers George T. "Design optimization and health monitoring for multi-directional composite flywheel energy storage systems." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Dissertations/HAI_XIN_18.pdf.

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Gu, Yan. "STUDIES ON ALTERNATING DIRECTION METHOD OF MULTIPLIERS WITH ADAPTIVE PROXIMAL TERMS FOR CONVEX OPTIMIZATION PROBLEMS." Kyoto University, 2020. http://hdl.handle.net/2433/259758.

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Wood, Kerry Neil. "Directional Communications to Improve Multicast Lifetime in Ad Hoc Networks." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/28599.

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Wireless ad-hoc networks are easily deployed, untethered to infrastructure, and have virtually an unlimited number of applications. However, this flexibility comes at the cost of finite and often unreplenishable power supplies. Once a node has consumed all of its power, it can no longer receive, transmit, gather information, or otherwise participate in the network. Therefore, reducing the amount of energy necessary for node communication has been an area of intense research. Previous work has investigated the use of directional antennas as a method to reduce inter-node power requirements. Ho
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Podobas, Artur. "Improving Performance and Quality-of-Service through the Task-Parallel Model​ : Optimizations and Future Directions for OpenMP." Doctoral thesis, KTH, Programvaruteknik och Datorsystem, SCS, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175539.

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With the failure of Dennard's scaling, which stated that shrinking transistors will be more power-efficient, computer hardware has today become very divergent. Initially the change only concerned the number of processor on a chip (multicores), but has today further escalated into complex heterogeneous system with non-intuitive properties -- properties that can improve performance and power consumption but also strain the programmer expected to develop on them. Answering these challenges is the OpenMP task-parallel model -- a programming model that simplifies writing parallel software. Our focu
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Rademacher, Michael [Verfasser]. "Evaluation and Optimization of IEEE802.11 multi-hop Backhaul Networks with Directional Antennas / Michael Rademacher." München : Verlag Dr. Hut, 2020. http://d-nb.info/1219476943/34.

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Zuo, Zihao, and Zhihao zuo@rmit edu au. "Topology optimization of periodic structures." RMIT University. Civil, Environmental and Chemical Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091217.151415.

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This thesis investigates topology optimization techniques for periodic continuum structures at the macroscopic level. Periodic structures are increasingly used in the design of structural systems and sub-systems of buildings, vehicles, aircrafts, etc. The duplication of identical or similar modules significantly reduces the manufacturing cost and greatly simplifies the assembly process. Optimization of periodic structures in the micro level has been extensively researched in the context of material design, while research on topology optimization for macrostructures is very limited and has grea
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Selvatici, Elena. "Variational formulation for Granular Contact Dynamics simulation via the Alternating Direction Method of Multipliers." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The subject of this thesis is the development of a calculation software for the numerical analysis and the dynamic simulation of a granular flow. One of the major problems encountered in the dynamic analysis of the mechanical behaviour of a granular medium is the enormous computational time taken to reach the solution of the problem. Following studies that have verified the effectiveness of the implicit formulation proposed by the Granular Contact Dynamics approach, the idea of this thesis arises from the desire to apply the Alternating Direction Method of Multipliers for the optimization
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Ettehadi, Osgouei Reza. "Rate Of Penetration Estimation Model For Directional And Horizontal Wells." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608737/index.pdf.

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Directional and horizontal drilling operations are increasingly conducted in all over the world, especially parallel to the growth of the technological developments in the industry. Common application fields for directional and horizontal drilling are in offshore and onshore when there is no way of drilling vertical wells. During directional and horizontal well drilling, many additional challenges occur when compared with vertical well drilling, such as limited weight on bit, harder hole cleaning, trajectory control, etc. This makes even harder to select the proper drilling parameters for incr
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Mahajan, Rahul. "Cross-Layer Optimization: System Design and Simulation Methodologies." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/35920.

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An important aspect of wireless networks is their dynamic behavior. The conventional protocol stack is inflexible as various protocol layers communicate in a strict manner. In such a case the layers are designed to operate under the worst conditions as opposed to adapting to changing conditions. This leads to inefficient use of spectrum and energy. Adaptation represents the ability of network protocols and applications to observe and respond to channel conditions. Traditional simulation methodologies independently model the physical and higher layers. When multiple layer simulations are
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Minarto, Eko [Verfasser], and Dirk [Akademischer Betreuer] Gajewski. "Optimization of Common Reflection Surface (CRS) attributes based on conjugate direction approach using Powell search method / Eko Minarto. Betreuer: Dirk Gajewski." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2014. http://d-nb.info/1046940236/34.

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Milena, Kresoja. "Modifications of Stochastic Approximation Algorithm Based on Adaptive Step Sizes." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104786&source=NDLTD&language=en.

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The problem under consideration is an unconstrained mini-mization problem in noisy environment. The common approach for solving the problem is Stochastic Approximation (SA) algorithm. We propose a class of adaptive step size schemes for the SA algorithm. The step size selection in the proposed schemes is based on the objective functionvalues. At each iterate, interval estimates of the optimal function&nbsp; value are constructed using the xed number of previously observed function values.&nbsp;If the observed function value in the current iterate is larger than the upper bound of the interval,
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Cevik, Mert. "Desifn And Optimization Of A Mixed Flow Compressor Impeller Using Robust Design Methods." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611105/index.pdf.

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This is a study that is focused on developing an individual design methodology for a centrifugal impeller and generating a mixed flow impeller for a small turbojet engine by using this methodology. The structure of the methodology is based on the design, modeling and the optimization processes, which are operated sequentially. The design process consists of engine design and compressor design codes operated together with a commercial design code. Design of Experiment methods and an in-house Neural Network code is used for the modeling phase. The optimization is based on an in-house code which
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Bonnelie, Pierre. "Déformations libres de contours pour l’optimisation de formes et application en électromagnétisme." Thesis, Limoges, 2017. http://www.theses.fr/2017LIMO0006/document.

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Dans cette thèse nous développons une technique de déformation pour l'optimisation de formes. Les formes sont représentées par leur frontière, paramétrée par des courbes de Bézier par morceaux. En tant que courbes polynomiales, elles sont définies par leurs coefficients que l'on appelle plutôt points de contrôle. Bouger les points de contrôle revient à modifier la courbe et donc déplacer la frontière des formes. Dans un contexte d'optimisation de formes, ce sont alors les points de contrôle qui sont les variables du problème et l'on a transformé ce dernier en un problème d'optimisation paramét
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Михальський, О. О. "Адміністративно-правова протидія правопорушенням у сфері інтелектуальної власності в Україні". Thesis, Науково-дослідний інститут публічного права; Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/64932.

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Дисертацію присвячено аналізу сутності та особливостей протидії правопорушенням у сфері інтелектуальної власності в Україні, а також шляхів удосконалення її адміністративно-правового регулювання. Визначається поняття інтелектуальної власності як об’єкта адміністративно-правової протидії. Здійснюється історико-правовий аналіз протидії правопорушенням у сфері інтелектуальної власності в Україні. Встановлюються сутність та зміст державно-правового механізму протидії правопорушенням у сфері інтелектуальної власності в Україні. Характеризуються правові засади протидії правопорушенням у сфері інтеле
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Velay, Maxime. "Méthodes d’optimisation distribuée pour l’exploitation sécurisée des réseaux électriques interconnectés." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT063/document.

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Notre société étant plus dépendante que jamais au vecteur électrique, la moindre perturbation du transport ou de l’acheminement de l’électricité a un impact social et économique important. La fiabilité et la sécurité des réseaux électriques sont donc cruciales pour les gestionnaires de réseaux, en plus des aspects économiques. De plus, les réseaux de transport sont interconnectés pour réduire les coûts des opérations et pour améliorer la sécurité. Un des plus grand défis des gestionnaires des réseaux de transport est ainsi de se coordonner avec les réseaux voisins, ce qui soulève des problèmes
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El, Bachari Rachid. "Contribution à l'étude des algorithmes proximaux : décomposition et perturbation variationnelle." Rouen, 1996. http://www.theses.fr/1996ROUES026.

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Cette thèse est consacrée à la résolution d'inclusions monotones et en particulier de problèmes d'optimisation convexe. D'une part, nous proposons une nouvelle méthode fondée sur une relaxation de l'étape proximale de la méthode de l'inverse partiel ; les tests numériques ont confirmé une amélioration très nette de la vitesse de convergence dans certains cas par rapport aux algorithmes connus. D'autre part, nous proposons une version diagonale de la méthode de Lions-Mercier, ce qui permet notamment en optimisation convexe, de combiner la méthode des directions alternées des multiplicateurs ave
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Lahsen-Cherif, Iyad. "Spectral and Energy Efficiency in 5G Wireless Networks." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS506/document.

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La pénurie d'énergie et le manque d'infrastructures dans les régions rurales représentent une barrière pour le déploiement et l'extension des réseaux cellulaires. Les approches et techniques pour relier les stations de base (BSs) entre elles à faible coût et d'une manière fiable et efficace énergiquement sont l'une des priorités des opérateurs. Ces réseaux peu denses actuellement, peuvent évoluer rapidement et affronter une croissance exponentielle due principalement à l'utilisation des téléphones mobiles, tablettes et applications gourmandes en bande passante. La densification des réseaux est
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Shen, Sumin. "Contributions to Structured Variable Selection Towards Enhancing Model Interpretation and Computation Efficiency." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96767.

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The advances in data-collecting technologies provides great opportunities to access large sample-size data sets with high dimensionality. Variable selection is an important procedure to extract useful knowledge from such complex data. While in many real-data applications, appropriate selection of variables should facilitate the model interpretation and computation efficiency. It is thus important to incorporate domain knowledge of underlying data generation mechanism to select key variables for improving the model performance. However, general variable selection techniques, such as the best su
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Santos, Fábio Marcelino de Paula. "Algoritmo enxame de partículas evolutivo para o problema de coordenação de relés de sobrecorrente direcionais em sistemas elétricos de potência." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-26082013-103833/.

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Um sistema elétrico de potência agrega toda a estrutura pela qual a energia elétrica percorre, desde a sua geração até o seu consumo final. Nas últimas décadas observou-se um significativo aumento da demanda e, consequentemente, um aumento das interligações entre sistemas, tornando assim a operação e o controle destes extremamente complexos. Com o fim de obter a desejada operação destes sistemas, inúmeros estudos na área de Proteção de Sistemas Elétricos são realizados, pois é sabido que a interrupção desses serviços causam transtornos que podem assumir proporções desastrosas. Em sistemas elét
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Jeddi, Babak. "A coordinated energy management scheme in a residential neighborhood under given market framework." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/200710/1/Babak_Jeddi_Thesis.pdf.

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This thesis proposes a computationally efficient home energy management system to optimize the electricity payment and improve the occupant's comfort degree by appropriately scheduling all devices of the home. It incorporates solar panels, battery systems, thermostatically controlled appliances, and deferrable appliances. Also, this thesis develops a coordinated framework for the operation of multiple home energy management systems in a residential neighborhood based on the optimal and secure operation of the grid. The coordinated load scheduling framework enables customers to cooperate to opt
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Horák, Jiří. "Planární antény na substrátech s elektromagnetickými zádržnými pásmy." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233478.

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Planar antennas are used in several technical applications. The family of planar antennas contains microstrip antennas, which are very popular due to the low weight, low profile, simple manufacturing and easy mass production. Lower gain and excitation of surface waves are disadvantages of microstrip antennas. The propagation of surface waves can be efficiently suppressed if the conventional substrate is replaced by an electromagnetic bandgap (EBG) substrate. Microstrip antennas on EBG substrates have been presented in an open literature for several years. Nevertheless, no published work is dev
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Rahman, Mustazibur. "Management of City Traffic, Using Wireless Sensor Networks with Dynamic Model." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30916.

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Road network of a region is of a paramount importance in the overall development. Management of road traffic is a key factor for the city authority and reducing the road traffic congestion is a significant challenge in this perspective. In this thesis, a Wireless Sensor Network (WSN) based road-traffic monitoring scheme with dynamic mathematical traffic model is presented that will not necessarily include all adjacent intersections of a block; rather the important major intersections of a city. The objective of this scheme is to reduce the congestion by re-routing the vehicles to better perfor
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Lahiani, Nouha. "Méthode hybride d'affectation des ressources humaines pour l'amélioration de la performance de la maintenance." Electronic Thesis or Diss., Paris 8, 2015. http://www.theses.fr/2015PA080037.

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Cette thèse propose un outil d’aide à la décision pour la gestion de processus de maintenance basée surune affectation optimale des ressources humaines afin d’améliorer la performance de la maintenance.En effet, une bonne performance de la fonction maintenance est indispensable pour maintenir laproductivité des installations industrielles, et donc de la compétitivité des entreprises manufacturières.L’approche que nous développons dans ce manuscrit procure un cadre de référence des leviersd’actions envisageables pour mesurer, évaluer, améliorer et optimiser la performance de lamaintenance. Nous
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Lahiani, Nouha. "Méthode hybride d'affectation des ressources humaines pour l'amélioration de la performance de la maintenance." Thesis, Paris 8, 2015. http://www.theses.fr/2015PA080037.

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Cette thèse propose un outil d’aide à la décision pour la gestion de processus de maintenance basée surune affectation optimale des ressources humaines afin d’améliorer la performance de la maintenance.En effet, une bonne performance de la fonction maintenance est indispensable pour maintenir laproductivité des installations industrielles, et donc de la compétitivité des entreprises manufacturières.L’approche que nous développons dans ce manuscrit procure un cadre de référence des leviersd’actions envisageables pour mesurer, évaluer, améliorer et optimiser la performance de lamaintenance. Nous
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Bernardes, Wellington Maycon Santos. "Algoritmo enxame de partículas discreto para coordenação de relés direcionais de sobrecorrente em sistemas elétricos de potência." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-14052013-094113/.

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Este trabalho propõe uma metodologia baseada em técnicas inteligentes capaz de fornecer uma coordenação otimizada de relés direcionais de sobrecorrente instalados em sistemas de energia elétrica. O problema é modelado como um caso de programação não linear inteira mista, em que os relés permitem ajustes discretizados de múltiplos de tempo e/ou múltiplos de corrente. A solução do problema de otimização correspondente é obtida através de uma metaheurística nomeada como Discrete Particle Swarm Optimization. Na literatura técnico-científica esse problema geralmente é linearizado e aplicam-se arred
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Moro, Vinícius de Cillo. "Metodologia para coordenação otimizada entre relés de distância e direcionais de sobrecorrente em sistemas de transmissão de energia elétrica." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-30102014-093627/.

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A proteção de sistemas de energia elétrica possui papel extremamente importante no aspecto de garantir o fornecimento de energia de maneira segura e confiável. Assim, a ação indevida ou a não atuação deste sistema de proteção pode causar danos materiais ou econômicos tanto para as concessionárias quanto para os consumidores de energia elétrica. Dessa forma, o sistema de proteção deve estar bem ajustado para que possa garantir suas funções, sendo sensível, seletivo, confiável e rápido. Para tanto, uma boa coordenação entre os relés de proteção deve ser estabelecida. No caso de um sistema de tra
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