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Thèses sur le sujet « Optimisation »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 25 juillet 2025

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1

Moser, Irene. "Applying external optimisation to dynamic optimisation problems." Swinburne Research Bank, 2008. http://hdl.handle.net/1959.3/22526.

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Thesis (Ph.D) - Swinburne University of Technology, Faculty of Information & Communication Technologies, 2008.<br>[A thesis submitted in total fulfillment of the requirements of for the degree of Doctor of Philosophy, Faculty of Information and Communication Technologies, Swinburne University of Technology, 2008]. Typescript. Includes bibliographical references p. 193-201.

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2

Poole, Daniel. "Efficient optimisation methods for generic aerodynamic shape optimisation." Thesis, University of Bristol, 2017. http://hdl.handle.net/1983/66904840-aed2-4797-9fb1-9d2b1d8b86ae.

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Aerodynamic shape optimisation amalgamates three, often independent, modules; a shape control system, a flow solver and an optimisation algorithm. The cornerstone is the shape control system, which governs the mapping between the real, continuous aerodynamic shape to the discretised surface that is used within the computational domain, using a set of design variables. The overall objectives of this work are to have efficient optimisation and design space exploration. Hence the focus of this work is first, shape control, and second, the optimisation algorithm. First, a novel shape control syste

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3

Tall, Abdoulaye. "Optimisation et Auto-Optimisation dans les réseaux LTE." Thesis, Avignon, 2015. http://www.theses.fr/2015AVIG0208/document.

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Le réseau mobile d’Orange France comprend plus de 100 000 antennes 2G, 3G et 4G sur plusieurs bandes de fréquences sans compter les nombreuses femto-cells fournies aux clients pour résoudre les problèmes de couverture. Ces chiffres ne feront que s’accroître pour répondre à la demande sans cesse croissante des clients pour les données mobiles. Cela illustre le défi énorme que rencontrent les opérateurs de téléphonie mobile en général à savoir gérer un réseau aussi complexe tout en limitant les coûts d’opération pour rester compétitifs. Cette thèse s’attache à utiliser le concept SON (réseaux au

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4

Salazar, Lechuga Maximino. "Multi-objective optimisation using sharing in swarm optimisation algorithms." Thesis, University of Birmingham, 2009. http://etheses.bham.ac.uk//id/eprint/303/.

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Many problems in the real world are multi-objective by nature, this means that many times there is the need to satisfy a problem with more than one goal in mind. These type of problems have been studied by economists, mathematicians, between many more, and recently computer scientists. Computer scientists have been developing novel methods to solve this type of problems with the help of evolutionary computation. Particle Swarm Optimisation (PSO) is a relatively new heuristic that shares some similarities with evolutionary computation techniques, and that recently has been successfully modified

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Yin, Xuefei. "Application of multidisciplinary design optimisation to engine calibration optimisation." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5630.

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Automotive engines are becoming increasingly technically complex and associated legal emissions standards more restrictive, making the task of identifying optimum actuator settings to use significantly more difficult. Given these challenges, this research aims to develop a process for engine calibration optimisation by exploiting advanced mathematical methods. Validation of this work is based upon a case study describing a steady-state Diesel engine calibration problem. The calibration optimisation problem seeks an optimal combination of actuator settings that minimises fuel consumption, while

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6

Heinonen, Annika. "Process Optimisation - An empirical study of process optimisation in Finland." Thesis, Högskolan i Jönköping, Internationella Handelshögskolan, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-17746.

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The objective of this master’s thesis is to determine methods for improving a company’s business processes without investing in new technology and whether a relatively small company can benefit from investing in technology. This study determines the meaning of process optimisation and how it should be conducted. Using existing theory and the case of a logistics company operating in Finland, this research attempts to identify hindrances and find opportunities for the company to develop their processes through process optimisation without technology. Different public bodies in Finland (such as t

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Soltun, Sindre. "Fleet Management Optimisation." Thesis, Norwegian University of Science and Technology, Department of Telematics, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10147.

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<p>This Master's Thesis is built around the concept of fleet management, focusing on designing and implementing a solution for such a purpose. As a target domain for this proposed system snow clearing has been chosen, and it is presented as background for the system realisation. An important feature in a fleet management system is route optimisation. Estimations based on real-world data can be used to construct more effective routes. This optimisation process is not straightforward though, as it belongs in a domain called Vehicle Routing Problems. These problems effectively becomes unsolvable

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8

Tournois, Jane. "Optimisation de maillages." Phd thesis, Université de Nice Sophia-Antipolis, 2009. http://tel.archives-ouvertes.fr/tel-00451619.

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Dans cette thèse, une approche pratique pour la génération de maillages triangulaires isotropes est proposée. En 2D comme en 3D, l'ob jectif consiste à mailler un domaine donné, pouvant avoir une géométrie complexe. L'approche présentée consiste à entrelacer des étapes de raffinement de Delaunay et des étapes d'optimisation de maillages dans le but de générer des maillages gradés de qualité. L'utilisateur peut contrôler les caractéristiques du maillage en déﬁnissant des critères de taille et de forme des simplexes, ainsi que de topologie et d'approximation. Les méthodes par éléments ﬁnis, larg

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9

Ning, Michael Zhu. "Relational combinatorial optimisation." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284507.

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10

Oliver, Kathryn E. "UMTS network optimisation." Thesis, Cardiff University, 2005. http://orca.cf.ac.uk/54561/.

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Network operators desire effective, pragmatic solutions to instances of the cell planning problem in order to improve their quality of service, enhance network coverage and capacity capability, and ultimately increase company profits. Previ ous cell plans have been constructed manually but these methods do not produce the best network configuration. More reliance has since been placed on automated cell planning to produce effective solutions. The introduction of the Universal Mobile Telecommunication System (UMTS) emphasizes the need for high perfor mance planning tools. Motivated by a discuss

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Scott, Simon Michael. "Electronic Nose Optimisation." Thesis, Teesside University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518259.

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Varoufakis, Y. "Optimisation and strikes." Thesis, University of Essex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377086.

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Routley, Paul Richard. "BiCMOS circuit optimisation." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242271.

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Arbex, Valle Cristiano. "Portfolio optimisation models." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/10343.

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In this thesis we consider three different problems in the domain of portfolio optimisation. The first problem we consider is that of selecting an Absolute Return Portfolio (ARP). ARPs are usually seen as financial portfolios that aim to produce a good return regardless of how the underlying market performs, but our literature review shows that there is little agreement on what constitutes an ARP. We present a clear definition via a three-stage mixed-integer zero-one program for the problem of selecting an ARP. The second problem considered is that of designing a Market Neutral Portfolio (MNP)

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Grigoryev, Igor. "Mine evaluation optimisation." Thesis, Federation University Australia, 2019. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/170937.

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The definition of a mineral resource during exploration is a fundamental part of lease evaluation, which establishes the fair market value of the entire asset being explored in the open market. Since exact prediction of grades between sampled points is not currently possible by conventional methods, an exact agreement between predicted and actual grades will nearly always contain some error. These errors affect the evaluation of resources so impacting on characterisation of risks, financial projections and decisions about whether it is necessary to carry on with the further phases or not. The

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Liu, Zhengliang. "Optimisation over the non-dominated set of a multi-objective optimisation problem." Thesis, Lancaster University, 2016. http://eprints.lancs.ac.uk/82563/.

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In this thesis we are concerned with optimisation over the non-dominated set of a multiobjective optimisation problem. A multi-objective optimisation problem (MOP) involves multiple conflicting objective functions. The non-dominated set of this problem is of interest because it is composed of the “best” trade-off for a decision maker to choose according to his preference. We assume that this selection process can be modelled by maximising a function over the non-dominated set. We present two new algorithms for the optimisation of a linear function over the non-dominated set of a multi-objectiv

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Helbig, Marde. "Solving dynamic multi-objective optimisation problems using vector evaluated particle swarm optimisation." Thesis, University of Pretoria, 2012. http://hdl.handle.net/2263/28161.

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Most optimisation problems in everyday life are not static in nature, have multiple objectives and at least two of the objectives are in conflict with one another. However, most research focusses on either static multi-objective optimisation (MOO) or dynamic singleobjective optimisation (DSOO). Furthermore, most research on dynamic multi-objective optimisation (DMOO) focusses on evolutionary algorithms (EAs) and only a few particle swarm optimisation (PSO) algorithms exist. This thesis proposes a multi-swarm PSO algorithm, dynamic Vector Evaluated Particle Swarm Optimisation (DVEPSO), to solve

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Wikborg, Uno. "Online Meat Cutting Optimisation." Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8887.

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<p>Nortura, Norways largest producer of meat, faces many challenges in their operation. One of these challenges is to decide which products to make out of each of the slaughtered animals. The meat from the animals can be made into different products, some more valuable than others. However, someone has to buy the products as well. It is therefore important to produce what the customers ask for. This thesis is about a computer system based on online optimisation which helps the meat cutters decide what to make. Two different meat cutting plants have been visited to specify how the system shou

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Geng, Ke. "XML semantic query optimisation." Thesis, University of Auckland, 2011. http://hdl.handle.net/2292/6815.

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XML Semantic Query Optimisation (XSQO) is a method that optimises execution of queries based on semantic constraints, which are extracted from XML documents. Currently most research into XSQO concentrates on optimisation based on structural constraints in the XML documents. Research, which optimises XML query execution based on semantic constraints, has been limited because of the flexibility of XML. In this thesis, we introduce a method, which optimises XML query execution based on the constraints on the content of XML documents. In our method, elements are analysed and classified based on th

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Balesdent, Mathieu. "Optimisation multidisciplinaire de lanceurs." Phd thesis, Ecole centrale de Nantes, 2011. http://tel.archives-ouvertes.fr/tel-00659362.

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La conception de lanceurs est un problème d'optimisation multidisciplinaire (MDO) complexe qui a la particularité d'intégrer une optimisation de trajectoire très contrainte, difficile à résoudre et fortement couplée à toutes les autres disciplines entrant en jeu dans le processus de conception (e.g. propulsion, aérodynamique, structure, etc.). Cette thèse s'intéresse aux méthodes permettant d'intégrer judicieusement l'optimisation de la trajectoire au sein du processus d'optimisation des variables de conception. Une nouvelle méthode, appelée "Stage-Wise decomposition for Optimal Rocket Design"

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Bouhaya, Lina. "Optimisation structurelle des gridshells." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00583409.

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Le terme gridshell désigne une coque discrète qui est obtenue par déformation élastique d'une grille bidirectionnelle continue plane sans rigidité en cisaillement puis rigidifiée par une troisième direction de barres. Ainsi défini, un gridshell a un potentiel structural intéressant et peut répondre à des exigences architecturales complexes. La recherche de forme de ces structures a été menée à travers l'histoire principalement par deux méthodes, la méthode du filet inversé et la relaxation dynamique. Ces deux méthodes permettent d'obtenir une forme approchée de celle proposée par l'architecte,

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Bukula, Nwabisa Asanda. "Optimisation of clearcoat viscosity." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/4814.

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Modern automobiles are painted with basecoat, technology which is either metallic, solid colour or pearlescent. This requires protection from chemicals, scratching, weathering and UV light by applying a protective top coat (clearcoat) over the basecoat. For the clearcoat to cure into a hard protective shell it undergoes an irreversible crosslinking process. This usually takes place over the first four to five hours, depending on the formulation and weather conditions. The speed of crosslinking can be enhanced by temperature. Pot life is important as it can affect the overall quality of the pai

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Tsang, King Hei. "Vaccine supply chain optimisation." Thesis, Imperial College London, 2006. http://hdl.handle.net/10044/1/7545.

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Tagliaferri, Francesca. "Dynamic yacht strategy optimisation." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/16237.

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Yacht races are won by good sailors racing fast boats. A good skipper takes decisions at key moments of the race based on the anticipated wind behaviour and on his position on the racing area and with respect to the competitors. His aim is generally to complete the race before all his opponents, or, when this is not possible, to perform better than some of them. In the past two decades some methods have been proposed to compute optimal strategies for a yacht race. Those strategies are aimed at minimizing the expected time needed to complete the race and are based on the assumption that the fas

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Datta, Subhalakshmi. "UMTS radio network optimisation." Thesis, University of Surrey, 2010. http://epubs.surrey.ac.uk/843921/.

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Radio network planning and optimisation include tasks such as propagation prediction, performance evaluation, and configuration optimisation. Unlike Time Division Multiple Access (TDMA) based systems, the network performance of Third Generation (3G) cellular systems cannot be based on signal predictions only. The maximum achievable path loss in a Wideband Code Division Multiple Access (WCDMA) cell is dependent on the cell load, which creates a complex trade-off between coverage and capacity. Given a user distribution, network performance calculation involves optimisation of transmit powers tak

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Giagkiozis, Ioannis. "Nonconvex many-objective optimisation." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/3683/.

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As many-objective optimisation problems become more prevalent, evolutionary algorithms that are based on Pareto dominance relations are slowly becoming less popular due to severe limitations that such an approach has for this class of problems. At the same time decomposition-based methods, which have been employed traditionally in mathematical programming, are consistently increasing in popularity. These developments have been led by recent research studies that show that decomposition-based algorithms have very good convergence properties compared to Pareto-based algorithms. Decomposition-bas

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Uzor, Chigozirim. "Compact dynamic optimisation algorithm." Thesis, De Montfort University, 2015. http://hdl.handle.net/2086/13056.

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In recent years, the field of evolutionary dynamic optimisation has seen significant increase in scientific developments and contributions. This is as a result of its relevance in solving academic and real-world problems. Several techniques such as hyper-mutation, hyper-learning, hyper-selection, change detection and many more have been developed specifically for solving dynamic optimisation problems. However, the complex structure of algorithms employing these techniques make them unsuitable for real-world, real-time dynamic optimisation problem using embedded systems with limited memory. The

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Bozsak, Franz. "Optimisation de stents actifs." Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-00858100.

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L'utilisation de stents actifs (DES) a révolutionné le traitement de l'athérosclérose. Le relargage contrôlé de médicaments anti-prolifératifs dans la paroi artérielle (PA) a permis de réduire fortement le taux de resténose intra-stent. Mais le risque de thromboses intra-stents tardives demeure un enjeu majeur des DES en partie lié au retard de cicatrisation de la PA endommagée lors de l'implantation. Cette thèse présente une méthode d'optimisation du design des DES afin d'inhiber la resténose sans affecter la cicatrisation. Pour quantifier la performance des différents designs, un modèle numé

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Wendemuth, Andreas. "Optimisation in neural networks." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386749.

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Manthilake, Inoka. "Evolutionary building layout optimisation." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8337.

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Space layout planning (SLP) is the organisation of functional/living spaces (spatial units-SUs) and corridors/access paths of a building satisfying requirements (e.g. accessibility, adjacency etc.) to achieve design goals (e.g. minimising unutilised space and travelling cost). Out of many ways of arranging SUs, a human designer may consider only a handful of alternatives due to resource limitations (e.g. time and effort). To facilitate this task, decision support for SLP design can be obtained using computer technology. Despite being highly combinatorial, many attempts have been made to automa

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Astapenko, D. "Automated system design optimisation." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6863.

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The focus of this thesis is to develop a generic approach for solving reliability design optimisation problems which could be applicable to a diverse range of real engineering systems. The basic problem in optimal reliability design of a system is to explore the means of improving the system reliability within the bounds of available resources. Improving the reliability reduces the likelihood of system failure. The consequences of system failure can vary from minor inconvenience and cost to significant economic loss and personal injury. However any improvements made to the system are subject t

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Wainwright, P. "Optimisation of chromatographic procedures." Thesis, Swansea University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639321.

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Brennan, Siobhan. "Fuel cell optimisation studies." Thesis, University of Ulster, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267783.

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Mohseninia, Mohsen. "Concurrent finite element optimisation." Thesis, University of Hertfordshire, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358479.

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Holdorf, Lopez Rafael. "Optimisation en présence d’incertitudes." Thesis, Rouen, INSA, 2010. http://www.theses.fr/2010ISAM0009.

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L’optimisation est un sujet très important dans tous les domaines. Cependant, parmi toutes les applications de l’optimisation, il est difficile de trouver des exemples de systèmes à optimiser qui ne comprennent pas un certain niveau d'incertitude sur les valeurs de quelques paramètres. Le thème central de cette thèse est donc le traitement des différents aspects de l’optimisation en présence d’incertitudes. Nous commençons par présenter un bref état de l’art des méthodes permettant de prendre en compte les incertitudes dans l’optimisation. Cette revue de la littérature a permis de constater un

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Robert, Raymond. "Optimisation d'un ventilateur liquidien." Mémoire, Université de Sherbrooke, 2003. http://savoirs.usherbrooke.ca/handle/11143/1274.

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Le présent mémoire est une contribution au projet de recherche initié au sein du Département de génie mécanique en partenariat avec le Centre Hospitalier Universitaire de Sherbrooke (CHUS). De ce partenariat a émergé l’équipe multidisciplinaire Inolivent regroupant des ingénieurs chercheurs, des cliniciens spécialistes en détresses respiratoires ainsi que des techniciens. L’objectif du projet est d’optimiser le ventilateur liquidien pour des enfants en bas âge, et ce, dans la poursuite des travaux de maîtrise de Meriem Mazouzi. Dans cette perspective, la première phase du travail a consisté à

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Patel, Deena. "Optimisation of neonatal ventilation." Thesis, King's College London (University of London), 2014. https://kclpure.kcl.ac.uk/portal/en/theses/optimisation-of-neonatal-ventilation(020793ce-af66-48de-b969-bc0d702a673f).html.

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Background: Infants born prematurely or at term may unfortunately suffer morbidity from ventilator related complications. New ventilation techniques have been developed aimed at reducing that morbidity, but have yet to be fully evaluated. Aim: To optimise the delivery of new techniques using physiological outcome measures. Methods: A series of studies were undertaken. The objectives were: • In prematurely born infants with acute respiratory distress, to determine the optimal level of volume targeted ventilation. • In term and prematurely born infants, to assess the effect on work of breathing

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Neelakantan, Pratap. "Optimisation of CML therapy." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/28084.

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TKI inhibitors have revolutionised CML therapy and the goals for management have shifted from finding newer therapies to optimising existing treatment approaches. We have tried to optimise CML therapy by identifying poor responders early by molecular monitoring, improve adherence by using self reported adherence and optimise intolerance by actively changing TKIs to overcome side effects. BCR-ABL PCR of < 10% at 3 months and < 1% at 6 months have become an accepted standard after the publication by Marin et al. We tried to combine the two measurements and showed that 3 month milestone predicts

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Luong, Vu Ngoc Duy. "Optimisation for image processing." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/24904.

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The main purpose of optimisation in image processing is to compensate for missing, corrupted image data, or to find good correspondences between input images. We note that image data essentially has infinite dimensionality that needs to be discretised at certain levels of resolution. Most image processing methods find a suboptimal solution, given the characteristics of the problem. While the general optimisation literature is vast, there does not seem to be an accepted universal method for all image problems. In this thesis, we consider three interrelated optimisation approaches to exploit pro

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Pattison, Rachel Lesley. "Safety system design optimisation." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/22019.

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This thesis investigates the efficiency of a design optimisation scheme that is appropriate for systems which require a high likelihood of functioning on demand. Traditional approaches to the design of safety critical systems follow the preliminary design, analysis, appraisal and redesign stages until what is regarded as an acceptable design is achieved. For safety systems whose failure could result in loss of life it is imperative that the best use of the available resources is made and a system which is optimal, not just adequate, is produced. The object of the design optimisation problem is

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Shetty, Sandeep Krishnanand. "Optimisation of neonatal ventilation." Thesis, King's College London (University of London), 2018. https://kclpure.kcl.ac.uk/portal/en/theses/optimisation-of-neonatal-ventilation(4bf50e9a-9ef5-41f9-baff-db581cf231d2).html.

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Background: Survival of neonates requiring respiratory support has improved over the last two decades, but unfortunately many suffer morbidity from ventilator related complications. Aim: To undertake a series of studies using physiological measurements as outcomes in infants with evolving or established bronchopulmonary dysplasia (BPD) to test the following hypotheses and carry out a national survey. Hypotheses: Proportional assist ventilation (PAV) compared to assist control ventilation (ACV) would improve oxygenation as assessed by the oxygenation index (OI). Neurally adjusted ventilatory as

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Joyce, Thomas. "Optimisation and Bayesian optimality." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/19564.

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This doctoral thesis will present the results of work into optimisation algorithms. We first give a detailed exploration of the problems involved in comparing optimisation algorithms. In particular we provide extensions and refinements to no free lunch results, exploring algorithms with arbitrary stopping conditions, optimisation under restricted metrics, parallel computing and free lunches, and head-to-head minimax behaviour. We also characterise no free lunch results in terms of order statistics. We then ask what really constitutes understanding of an optimisation algorithm. We argue that on

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KIM, BYEONG-SAM. "Optimisation des structures inelastiques." Palaiseau, Ecole polytechnique, 1996. http://www.theses.fr/1996EPXX0006.

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Les diverses industriels doivent constamment faire face a de nombreux obstacles pour ameliorer la qualite de leurs structures mais aussi pour reduire leurs couts de production et atteindre une solution numerique. Mais des difficultes importantes sont rencontres dans la modelisation des materiaux et des structures. D'autres difficultes fondamentales apparaissent dans l'analyse des structures. Des difficultes encore plus considerables sont dans les choix optimaux des parametres de conception. Une nouvelle approche, la conception optimisee intelligente des structures, a ete recemment proposes, au

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Boulmier, Simon. "Optimisation globale avec LocalSolver." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALM037.

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LocalSolver est un logiciel de programmation mathématique.Originellement pensé pour traiter les grands problèmes d’optimisation combinatoire rencontrés dans l’industrie, son fonctionnement repose sur des heuristiques de recherche locale.Cette approche de résolution pragmatique, couplée à des structures de modélisation expressives, non linéaires et ensemblistes, lui ont permis de s'imposer dans le catalogue des solveurs commerciaux.L'objet de cette thèse est le développement d'une approche duale, complémentaire à la recherche locale, qui fournira des bornes aux problèmes traités.L'intérêt princ

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AMINE, ZOHRA. "Optimisation des machines electriques." Paris 11, 1992. http://www.theses.fr/1992PA112076.

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Apres un rappel de la formulation du probleme d'optimisation des machines electriques et les differentes methodes utilisees dans ce domaine, la methode de synthese et d'optimisation a ete exposee. La these comporte des applications a des machines presentant des problemes differents et faisant appel a des modeles electromagnetiques, thermiques, et mecaniques. Les resultats sont presentes et discutes

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Desmorat, Boris. "Optimisation de structures composites." Cachan, Ecole normale supérieure, 2002. http://www.theses.fr/2002DENS0040.

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Radhouane, Ridha. "Optimisation de modems VDSL." Valenciennes, 2000. https://ged.uphf.fr/nuxeo/site/esupversions/63219c61-e8b1-424c-a9aa-4c3502179c78.

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Nous avons effectué cette thèse dans un contexte de transmission numérique DMT-VDSL. Trois sujets ont été traités dans ce cadre ; la transformée de Fourier rapide (FFT), la réduction des interférences VDSL sur les bandes HAMet l'entrelacement convolutionnel. Nous avons proposé une implémentation originale, la FFT flux continu mode mixte (CFMM-FFT), qui optimise la mémoire de traitement de la FFTen la réduisant de trois fois la taille de l'entrée à seulement deux fois. La CFMM-FFT est paramétrable et sans complexité particulière et elle sera exploitée par Texas Instruments dans ses modems DMT-V

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Saeed, Nagham. "Intelligent MANET optimisation system." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/5674.

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In the literature, various Mobile Ad hoc NETwork (MANET) routing protocols proposed. Each performs the best under specific context conditions, for example under high mobility or less volatile topologies. In existing MANET, the degradation in the routing protocol performance is always associated with changes in the network context. To date, no MANET routing protocol is able to produce optimal performance under all possible conditions. The core aim of this thesis is to solve the routing problem in mobile Ad hoc networks by introducing an optimum system that is in charge of the selection of the r

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Hagströmer, Björn. "Liquidity and portfolio optimisation." Thesis, Aston University, 2009. http://publications.aston.ac.uk/15679/.

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This thesis presents research within empirical financial economics with focus on liquidity and portfolio optimisation in the stock market. The discussion on liquidity is focused on measurement issues, including TAQ data processing and measurement of systematic liquidity factors (FSO). Furthermore, a framework for treatment of the two topics in combination is provided. The liquidity part of the thesis gives a conceptual background to liquidity and discusses several different approaches to liquidity measurement. It contributes to liquidity measurement by providing detailed guidelines on the data

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See-Toh, Yoong Chiang. "Paints supply chain optimisation." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/7504.

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In production planning for strong seasonal demand products, it is uneconomical to configure the supply chain for throughputs equivalent to the demand peaks. Instead, a holistic approach to supply chain optimisation is adopted where forward demand forecasts drive the production planning process. In this thesis, the medium-term supply chain planning components of forecasting, production planning and evaluation are addressed through studies on a paints production facility. With a large number of specialised products, family-level forecasting is adopted for its simplicity and practicality in apply

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