Dissertations / Theses on the topic 'Port optimisation'
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Mbiydzenyuy, Gideon. "An Optimisation Model for Sea Port Equipment Configuration." Thesis, Blekinge Tekniska Högskola, Avdelningen för för interaktion och systemdesign, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4244.
Full textLotsgatan 14 374 35, Karlshamn Mobile: 0046 768 85 67 13
Kefi, Meriam. "Optimisation Heuristique Distribuée du Problème de Stockage de Conteneurs dans un Port." Phd thesis, Ecole Centrale de Lille, 2008. http://tel.archives-ouvertes.fr/tel-00366467.
Full textRouky, Naoufal. "Optimisation et simulation de la massification du transport multimodal de conteneurs." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMLH40/document.
Full textToday, seaports face increasingly stringent requirements imposed by the considerable growth of goods transited by sea. Indeed, the organization of the port sector has evolved rapidly and has caused several negative impacts, including pollution and congestion of terminals, which constitute today the major concerns of port operators. To address those challenges, several ports have decided to build multimodal terminals that act as mega-hubs for maritime terminals, in order to free the storage areas on the maritime terminals, to promote the use of consolidated container modes of transfer and to reduce greenhouse gas emissions by using alternative modes to the road. Nevertheless, the management of these new logistic systems is laborious. This is due to several factors, including the dynamic and distributed nature of these systems, the variety of operations, and the lack of information needed to control flow. The aim of this thesis is to develop approaches capable of meeting the needs of port operators in a multimodal terminal, taking into account the different sources of uncertainty. Two optimization problems are mainly considered in this thesis, namely : the Rail Shuttle Routing Problem(RSRP) and the Quay Crane Scheduling Problem(QCSP). To address the complexity and uncertainties of these problems, we propose new mathematical models, as well as some heuristics approaches based on ant colony optimization, robust optimization and Simulation-Optimization. The various numerical tests carried out proved the effectiveness and the robustness of the proposed algorithms
Assaf, Cyril. "La gestion du Terminal à conteneurs du Port de Beyrouth et l’apport de la théorie de la structuration d’A. Giddens." Thesis, Paris 2, 2016. http://www.theses.fr/2016PA020023/document.
Full textThe problematic covers the way ports in general and the container terminal of the port of Beirut in Lebanon, in particular, manage and optimize the flow of their daily operations.We also included the theory of structuration of Giddens which is a social theory and a theory of social relations, to see how some of its principles could be valuable to our study.The subject of the management of a container terminal and the flaws that reside in its management and that affect its performance is an issue that has not been discussed in depth before. Our deep dive in the container terminal of Beirut port for a year has allowed us to understand the true nature of its problems and their sources.Our presence on the ground gave us the opportunity to conduct a series of meetings with heads of departments in order to understand the gaps and obstacles they face and be able to suggest solutions to their problems through this thesis.Our interviews with heads of departments were aimed at gathering for each department a description of the daily running of operations, the most recurrent problems and challenges they face and come up with possible ways to counter them.This thesis aimed to develop a list of recommendations by department in order to improve each department’s performance in the future and thereby increase the overall performance of the Beirut container terminal
Ayachi, Hajjem Imen. "Techniques avancées d'optimisation pour la résolution du problème de stockage de conteneurs dans un port." Thesis, Ecole centrale de Lille, 2012. http://www.theses.fr/2012ECLI0003/document.
Full textThe loading and unloading of containers and their temporary storage in the container terminal are the most important and complex operation in seaport terminals. It is highly inter-related with the routing of yard crane and truck and their costs increased significantly especially without an efficient terminal management. To improve this process, an efficiency decision for the container storage space allocation must be taken.In this thesis, we studied the container storage problem (CSP). It falls into the category of NP hard and NP complete problems. CSP consists on finding the most suitable storage location for incoming containers that minimizes rehandling operations of containers during their transfer to the ship, truck or train. In fact, the wait time of customer trucks, the transfer time of yard crane and the Ship turnaround time are advantageously reduced.Generally, this problem is studied considering a single container type. However, this does not stand the problem under its real-life statement as there are multiple container types that should be considered, (refrigerated, open side, empty, dry, open top and tank). Often, containers arrive at the port dynamically over time and have an uncertain departure date (ship delayed, a ship down, delayed arrival of customer trucks…). Indeed, CSP must be studied in dynamic aspectThe objective of this thesis is to study Static CSP for a single and various container type and dynamic CSP for ONE and several container types and to propose solutions for each of them. Genetic algorithm and Harmony Search algorithm are used to solve these problems and we compare the results of each approach with the LIFO algorithm
Tano, Krongrossi. "Conception et implémentation d'un système intégrant des modèles de simulation et un SIADS (système interactif d'aide à la décision spécifique) de gestion portuaire : application à la gestion du port autonome d'Abidjan." Paris 9, 1994. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1994PA090020.
Full textMaddah, Mohammad Reza. "3D visualization and interactive image manipulation for surgical planning in robot-assisted surgery." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2018. http://www.theses.fr/2018IMTA0079/document.
Full textRobot-assisted surgery, or “robotic”surgery, has been developed to address thedifficulties with the traditional laparoscopicsurgery. The da Vinci (Intuitive Surgical, CA andUSA) is one of the FDA-approved surgical robotic system which is widely used in the case of abdominal surgeries like hysterectomy and cholecystectomy. The technology includes a system of master and slave tele-manipulators that enhances manipulation precision. However, inadequate guidelines and lack of a human machine interface system for planning the ports on the abdomen surface are some of the main issues with robotic surgery. Unreachable target and mid-surgery collisions between robotic arms are the major problems that surgeons complain about in robotic surgery. The objective of this research is to design a new decision-support tool for planning port placement in robotic surgery. The decision support system will be able to determine the optimal location of the entrance ports on the abdomen surface that is specific to the patient
Perodou, Arthur. "Frequency design of passive electronic filters : a modern system approach." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC046.
Full textThe current explosion of communicating devices (smartphones, drones, IoT...), along with the ever-growing data to be transmitted, produces an exponential growth of the radiofrequency bands. All solutions devised to handle this increasing demand, such as carrier aggregation, require to synthesise frequency filters with stringent industrial requirements (performance, energy consumption, cost ...). While the technology of acoustic wave (AW) resonators, that seem to be the only passive micro-electronic components available to fulfil these requirements, is mature, the associate design problem becomes dramatically complex. Traditional design methods, based on the intuition of designers and the use of generic optimisation algorithms, appear very limited to face this complexity. Thus, systematic and efficient design methods need to be developed. The design problem of AW filters happens to be an instance of the more general design problem of passive electronic filters, that played an important role in the early development of Linear Control and System theory. Systematic design methods were developed in particular cases, such as for LC-ladder filters, but do not enable to tackle the case of AW filters. Our aim is then to revisit and generalise these methods using a modern System approach, in order to develop systematic and efficient design methods of passive electronic filters, with a special focus on AW filters. To achieve this, the paradigm of convex optimisation, and especially the sub-class of Linear Matrix Inequality (LMI) optimisation, appears for us a natural candidate. It is a powerful framework, endowed with efficient solvers, able to optimally solve a large variety of engineering problems in a low computational time. In order to link the design problem with this framework, it is proposed to use modern tools such as the Linear Fractional Transformation (LFT) representation and a mathematical characterisation coming from Dissipative System theory. Reviewing the different design methods, two design approaches stand out. The first approach consists in directly tuning the characteristic values of the components until the frequency requirements are satisfied. While very flexible and close to the original problem, this typically leads to a complex optimisation problem with important convergence issues. Our first main contribution is to make explicit the sources of this complexity and to significantly reduce it, by introducing an original representation resulting from the combination of the LFT and the Port-Hamiltonian Systems (PHS) formalism. A sequential algorithm based on LMI relaxations is then proposed, having a decent convergence rate when a suitable initial point is available. The second approach consists of two steps. First, a transfer function is synthesised such that it satisfies the frequency requirements. This step is a classical problem in Control and Signal Processing and can be efficiently solved using LMI optimisation. Second, this transfer function is realised as a passive circuit in a given topology. To this end, the transfer function needs to satisfy some conditions, namely realisation conditions. The issue is to get them with a convex formulation, in order to keep efficient algorithms. As this is generally not possible, an idea is to relax the problem by including common practices of designers. This leads to solve some instances of a general problem denoted as frequency LFT filter synthesis. Our second main contribution is to provide efficient synthesis methods, based on LMI optimisation, for solving these instances. This is achieved by especially generalising the spectral factorisation technique with extended versions of the so-called KYP Lemma. For particular electronic passive filters, such as bandpass LC-ladder filters, this second approach allows to efficiently solve the design problem. More generally, it provides an initial point to the first approach, as illustrated on the design of a particular AW filter
Rousseau, Xavière. "Optimisation de l'utilisation de phosphore alimentaire chez le porc et le poulet en croissance." Thesis, Tours, 2013. http://www.theses.fr/2013TOUR4057/document.
Full textThe reduction of dietary phosphorus (P) and the optimisation of its utilisation by the animals represent major challenges for the sustainability of poultry and pig production. The development of new feeding strategies ensuring an efficient utilization of P appears crucial particularly during the finishing period. The present work contributed to redefine the requirement of P of the animals during this phase in conjunction with the other constituents of the feed matrix well-known to significantly impact on the overall utilisation of P (Ca, microbial phytase). Moreover, this work quantified the impact of Ca and microbial phytase on the digestive and metabolic flows of P. On one hand, generated knowledge helps developing mechanistic models simulating the fate of P in the scale of the animal and on the other hand new feeding systems to meet the challenges of sustainability
Cagin, Stéphanie. "Méta-modèles réduits et séparés du comportement de balayage d'un moteur Diesel 2-temps pour l'exploration évolutionnaire des espaces de solutions." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0383/document.
Full textThe use of numerical methods to design a product became more and more commonover the past 30 years. However, numerical models are still specialized and they do not run fastwhich make their use problematic. So some reduced models of scavenging have been developed. These models are analytical andgeneric; they run quickly and avoid the numerical treatment problems. They are also some efficienttools in the search of design solutions.The work carried out has led to a new methodology based on a behavioral meta-model called“neuro-separated” including a neuronal model of state, a pseudo-dynamic neuronal model and amodel with separated variables. Then, a process of decision aids exploiting the models previouslydeveloped in evolutionary algorithms (genetic algorithms) and the fast behavioral simulation of theoptimal design solutions thanks to the kriging approach.This design approach is multi-viewpoints, multi-criteria and multi-physics. It also includes acognitive dimension: both free and controlled evolutionary explorations of solution spaces have beendone. To validate the method, some qualification criteria have been evaluated for each model. Theyallow to understand and to assume the gap between the reduced models and the initial CFD base(where the model are coming from). Our approach has led to the development of a tool of model and decision aids using Python and Matlab software programs
Jeanne, Thomas. "Caractérisation et optimisation des paramètres microbiens dans une pile bio-électrochimique fonctionnant au lisier de porc." Master's thesis, Université Laval, 2013. http://hdl.handle.net/20.500.11794/25230.
Full textGermain, Simon. "Conception d'une mesure automatisée de détection des changements alimentaires chez le porc." Mémoire, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/7925.
Full textTanneau, Olivier. "Modélisation de panneaux d'isolation aéronautiques : couplages poro-élastiques, élastodynamiques et acoustiques par méthodes analytiques, FEM et BEM." Paris 6, 2004. http://www.theses.fr/2004PA066401.
Full textHattingh, Raina. "Framework to guide mine-related land use planning towards optimisation of the coal mining rehabilitated landscape." Diss., University of Pretoria, 2018. http://hdl.handle.net/2263/65312.
Full textDissertation (MSc) - University of Pretoria, 2018.
Coaltech Research Institute, Chamber of Mines
Chamber of Mines
Geography, Geoinformatics and Meteorology
MSc
Unrestricted
Singh, Parminder. "Optimisation des processus de séparation de matière sèche à partir du lisier de porc en ajoutant du biochar." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/29264/29264.pdf.
Full textPolo, Luz. "Caractérisation et optimisation de la performance des cartouches d'ancrage AMBEX sous chargement soutenu." Mémoire, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/10138.
Full textAbstract : Adhesive anchoring systems are used in many civil engineering applications, including rehabilitation and repair of infrastructure such as bridge decks, roadways, tunnels, dams, walls, columns, and in some geological explorations and mining. An adhesive anchoring system consists of three components: the anchor: a reinforcing bar or a threaded rod; the adhesive material: polymeric, cementitious or hybrid; and a substrate of concrete or masonry. The loads applied on the anchor rods are transmitted by a chemical adhesion to the substrate (reactions) and mechanical interlock between the components mentioned. The design pattern of uniform adhesion establishes that the structural performance of an adhesive anchoring system is determined by the bond strength (τ) developed across the contact surface, between the components within the anchor hole. This project, in partnership with AMBEX, investigates and assesses the performance of an anchoring system, with an adhesive of cementitious material, related to the creep behaviour. To achieve this, steel rebars were anchored in a conventional concrete substrate. Two adhesives were evaluated: AAC and ARC cartridges. Geometrical and installation parameters were taken into account, to ensure bond failure during pullout tests. Two service conditions were studied: room temperature (21ºC) and high temperature (43ºC). Static tensile tests and creep tests were performed. The results are presented in graphs “load-displacement-time”, in order to make predictions of future behavior. The project shows the advantages of adhesive anchors made of cementitious material, as a feeble creep rate at sustained load, and also some limitations, as the variability of tension test results for anchors tested with AAC cartridge.
Collonge, Julien. "Analyse post-Pareto en optimisation vectorielle stochastique et déterministe : étude théorique et algorithmes." Thesis, Nouvelle Calédonie, 2014. http://www.theses.fr/2014NCAL0061/document.
Full textThis thesis explore related aspects to post-Pareto analysis arising from Stochastic Vector Optimization Problem. A Stochastic Vector Optimization Problem is to optimize a random vector objective function defined on an arbitrary set, and taking values in a partially ordered set. Its solution set (called Pareto set) consists of the feasible solutions which ensure some sort of equilibrium amongst the objectives. That is to say, Pareto solutions are such that noneof the objectives values can be improved further without deterioring another. Technically speaking, each Pareto solution is acceptable. The natural question that arises is : how to choose one solution ? One possible answer is to optimize an other objective over the Pareto set. Considering the existence of a decision-maker with its own criteria, we deal with the post-Pareto Stochastic Optimization Problem of minimizing its real-valued criteria over the Pareto set
Diab, Hassan. "Modélisation et optimisation de structures flottantes pour l'aide à la décision d'aménagement portuaire." Thesis, Troyes, 2016. http://www.theses.fr/2016TROY0022/document.
Full textThe objective of this thesis is to add a contribution in the field of modeling of the behavior of floating breakwaters, in order to optimize the positioning and sizing of these structures. It is aimed to participate in the definition of the decision making techniques in harbor development intended to the protection of installations. A new model for the behavior of floating breakwaters is proposed. This simple and efficient behavior model combines two models: The first is an extended and improved Berkhoff model that takes into account the effects of bed friction, highly variable bathymetry and wave breaking so that the propagation of waves in the horizontal plane of harbor is evaluated. The second model describes the hydrodynamic behavior of a floating breakwater in the vertical plane of its cross section. A parametric study is used to globally validate the new model, after which a specific optimization approach based on a multi criteria formulation of the optimization problem is proposed. Meta-modeling techniques and stochastic algorithm are together employed to speed up the calculations. The obtained Pareto front allows, for a given harbor, to determine the maximum absorption capacity of waves and the dimensions of the smallest breakwater
Mullath, Aravind. "Process simulation and optimisation of thin wall injection moulded components." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/13521.
Full textKerr-Conte, Julie. "Optimisation de la source de tissu endocrine pancréatique pour la transplantation chez les diabétiques de type 1." Lille 1, 1995. http://www.theses.fr/1995LIL10126.
Full textJarret, Guillaume. "Optimisation des stratégies alimentaires des porcs en vue de la maîtrise des émissions gazeuses (NH₃ et CH₄) via l’incorporation de coproduits de biocarburants." Rennes 1, 2010. http://www.theses.fr/2010REN1S202.
Full textThe price increase of cereals, the shortfall in plant protein production and the increasingly strong environmental pressure relating to livestock wastes, together constitute a new situation which could be favourable to the use of new animal feed materials such as the biofuel by-products. The first objective was thus to evaluate the impact of pig diets that include certain by-products on the total N and C excreted and on the subsequent level of atmospheric pollutants emitted from the waste during storage or anaerobic treatment. The second objective was a better understanding of the processes involved and those factors influencing the emissions regarding animal feeding and effluent management strategies. The incorporation of by-products in animal diets reduced the digestibility of organic matter, of nitrogen, of carbon and of energy. The same diet change increased the amount of faeces excreted per pig per day and shifted the partition of nitrogen excreted from urine to faeces. Concurrently, the pH of the faeces and of the slurry decreased, concurrent with an increase in the volatile fatty acid content and a reduction of the ammoniacal N. The inclusion of by-products reduced the ammonia volatilization from the stored waste by between 19 and 33%. The B0 for the effluent produced tended to decrease for the pig diets rich in fibre but the quantity of methane produced by pig slurry was greatly increased (+50 to 66%). The effluent management, as well as the feeding strategies affected the dynamics of methane production during manure storage. The MCF values are lower for the diets rich in proteins and greater for the diets rich in fibres
Rousseau, Pierre. "Étude, modélisation et optimisation d’un procédé de traitement des lisiers de porcs par couplage de la digestion anaérobie et du traitement biologique de l’azote." Rennes 1, 2009. http://www.theses.fr/2009REN1S011.
Full textIndustrialization of animal production participated in the pollution of fresh water. So, biological treatment processes were developed to reduce the nitrogen load applied locally, At the same time, anaerobic digestion of livestock wastes is also an interesting alternative, but not affecting the nitrogen concentration. In this context, the development of a process combining both anaerobic digestion and biological nitrogen removal could allow converting organic matter into a valuable energy while respecting the environmental constraints as regards nitrogen. The management of the interactions between aerobic and anaerobic processes and the optimisation of organic matter use are the main issues of this project. In order to reach these challenges, two parallel and complementary approaches have been considered: an experimental approach and a numerical approach. Experimental work, carried out on a pilot process, highlighted (i) the absence of inhibition by ammonia into the digester, (ii) the slow kinetics of anaerobic degradation of pig manure and (iii) the feasibility to obtain and control nitrate short-cut by oxygen inflow reduction. The modelling framework resulted in a combination of the Activated Sludge Model No. 1 (ASM1) and Anaerobic Digestion Model No. 1 (ADM1) through two interfaces. The use of this model allowed a better understanding of the interactions between aerobic and anaerobic processes and to a better definition of the operating parameters to optimize the use of organic matter including conditions to obtain nitrate short-cut
Pham, Hoai Son. "Optimisation et comportement en fatigue de la connexion bois-BFUP pour de nouveaux ponts mixtes." Phd thesis, Ecole des Ponts ParisTech, 2007. http://pastel.archives-ouvertes.fr/pastel-00003725.
Full textVilleger, Sandrine. "Optimisation d'une post décharge N2-O2 en vue d'une application à un procédé de stérilisation." Toulouse 3, 2004. http://www.theses.fr/2004TOU30301.
Full textValleron, Arthur, and Arthur Valleron. "Etude et optimisation de capteurs de gaz a base de dioxyde d'etain en conditions d'une ligne d'echappement automobile." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. http://tel.archives-ouvertes.fr/tel-00740252.
Full textLongnos, Florian. "Etude et optimisation des performances électriques et de la fiabilité de mémoires résistives à pont conducteur à base de chalcogénure/Ag ou d'oxyde métallique/Cu." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT046.
Full textNon-volatile memory technology has recently become the key driver for growth in the semiconductor business, and an enabler for new applications and concepts in the field of information and communication technologies (ICT). In order to overcome the limitations in terms of scalability, power consumption and fabrication complexity of Flash memory, semiconductor industry is currently assessing alternative solutions. Among them, Conductive Bridge Memories (CBRAM) rely on the resistance switching of a solid electrolyte induced by the migration and redox reactions of metallic ions. This technology is appealing due to its simple two-terminal structure, and its promising performances in terms of low power consumption, program/erase speed. Furthermore, the CBRAM is a memory technology that can be easily integrated with standard CMOS technology in the back end of line (BEOL). In this work we study the electrical performances and reliability of two different CBRAM technologies, specifically using chalcogenides (GeS2) and metal oxide as electrolyte. We first focus on GeS2-based CBRAM, where the effect of doping with Ag and Sb of GeS2 electrolyte is extensively investigated through electrical characterization analysis. The physical mechanisms governing the switching kinetics and the thermal stability are also addressed by means of electrical measurements, empirical model and 1st principle calculations. The influence of the different set/reset programming conditions is studied on a metal oxide based CBRAM technology. Based on this analysis, the programming conditions able to maximize the memory window, improve the endurance and minimize the variability are determined
Streiff, Kathy. "Optimisation de la production de semences hybrides de blé tendre : détermination des facteurs limitants." Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL023N.
Full textValleron, Arthur. "Etude et optimisation de capteurs de gaz a base de dioxyde d’etain en conditions d’une ligne d’echappement automobile." Thesis, Saint-Etienne, EMSE, 2011. http://www.theses.fr/2011EMSE0613/document.
Full textThis study is dedicated to the optimization of chemical gas sensors based on resistive type tin dioxide (SnO2) for automotive exhaust application. The sensors were produced by screen-printing technique which allows mass production of robust sensors on alumina substrate. In regards of the automotive application, the sensors were optimized by adding a porous protective layer deposited on the sensing element SnO2. The behaviour of this type of gas sensors was studied depending on gas parameters such as gas temperature and velocity, representative of real operation conditions. In addition, a “simple” modelisation of the electrical response of sensors depending on the concentration of one or more gaseous targets is proposed
Tanguy, Philippe. "Etude et optimisations d'une communication à haut débit par courant porteur en ligne pour l'automobile." Rennes, INSA, 2012. http://www.theses.fr/2012ISAR0015.
Full textThe automotive industry use more and more electronic for comfort, for the security,. . . However, the manufacturers observed a bottleneck in wiring harnesses. We propose to study a new communication network which does not need new wires: the power line communication (PLC). In a first step, we realized a study of feasibilty with indoor modem (HPAV & HD-PLC standard). Then, we studied and characterized the in-vehicle PLC channel thanks to measurements on four vehicles. Afterwards, a study (simulations) on the parameters of a multicarrier modulation showed that we can increase the inter-carrier spacing and reduce the guard intervall length compared with HPAV. Finally, we realized a flexible demonstrator which use a software-defined radio platform USRP2. The first results are similar with the simulations
Caballero, Monteso Ricard Josep. "Teoremes de No Free Lunch en el continu i el model del Pont Brownià en optimització." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/382825.
Full textThis Ph.D. thesis consists mainly of two parts. In the first part, a famous theorem in the field of theoretical optimisation is generalised to continuous variable: The No-Free-Lunch Theorem, which states that all algorithms are equally good when one averages its efficiency over all possible functions to optimise. This generalisation uses in a very natural way the theory of stochastic processes, and concludes that there are no No-Free-Lunch theorems in the continuum, except for certain extreme cases of little practical significance. In the second part, the Brownian Bridge has been considered as a probabilistic model for optimisation problems of the "black box" type, in which we do not have an analytical form of the function, but that the latter can only be evaluated in a certain number of points. Moreover, we consider that each of these evaluations are very expensive, so that only a few of them will be made. The probabilistic model considers that the function to optimise is a path of a stochastic process with a given probability law. From the point of view of computational complexity, this study corresponds to the "average performance" of algorithms, versus the usual "worst-case performance". But this has always been done before from the asymptotic standpoint, when the number of evaluations tends to infinity, and one of the goals of this thesis focuses on improving the estimation of the optimal value when the function can only be evaluated in a few points. In this regard, in a study that was missing in the literature, we compare and analyze several heuristics, adaptive and non-adaptive, concluding which one is most efficient. Moreover, in working with Brownian bridge, we found two formulae not given explicitly before, namely the density of the argument of the Brownian bridge (in the general setting) and the joint density of a bridge and its minimum. In addition, in this thesis many simulation experiments have been performed to calculate quantiites that are difficult, expensive or impossible to obtain analytically. Following a philosophy of practicality, some routines have been programmed, such as the histogram of the argument of the minimum of the Brownian Bridge conditioned to n points, that get a reasonable probabilistic estimate of the error incurred.
Garcia, Lorca Federico. "Filtres récursifs temps réel pour la détection de contours : optimisations algorithmiques et architecturales." Paris 11, 1996. http://www.theses.fr/1996PA112439.
Full textPham, Viet Nga. "Programmation DC et DCA pour l'optimisation non convexe/optimisation globale en variables mixtes entières : Codes et Applications." Phd thesis, INSA de Rouen, 2013. http://tel.archives-ouvertes.fr/tel-00833570.
Full textDelaunay, Xavier. "Compression d'images satellite par post-transformées dans le domaine ondelettes." Phd thesis, Toulouse, INPT, 2008. http://oatao.univ-toulouse.fr/7746/1/delaunay.pdf.
Full textHerr, Nathalie. "Contribution à l'ordonnancement post-pronostic de plateformes hétérogènes et distribuées : approches discrète et continue." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2049/document.
Full textThis thesis addresses the problem of maximizing the production horizon of a heterogeneous distributed platform composed of parallel machines and which has to provide a global production service. Each machine is supposed to be able to provide several throughputs corresponding to different operating conditions. It is assumed that using a machine with degraded performances compared to nominal ones allows to extend its useful life before maintenance. The study falls within the decisional step of PHM (Prognostics and Health Management), in which a prognostics phase allows to determine remaining useful lives of machines. The optimization problem consists in determining the set of machines to use at each time and a running profile for each of them so as to maximize the production horizon before maintenance. Machines running profiles are defined on the basis of two models. First one depicts the behavior of machines used with a discrete number of performances. For this case, the problem complexity is first studied considering many variants of the optimization problem. Several optimal and sub-optimal resolution methods are proposed to deal with the scheduling problem. Several sub-optimal resolution methods are then proposed for the second model, which applies to machines whose throughput rate can vary continuously between two bounds. These research works allow to determine the time before failure of a system on the basis of its components remaining useful lives
Duran, Ozlem. "Evaluation of retrofitting strategies for post-war office buildings." Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/32268.
Full textBenhidjeb, Ali. "Contribution à l'étude de la commande d'un système de type pont roulant : comparaison expérimentale des méthodes analytiques et floues." Mulhouse, 1995. http://www.theses.fr/1995MULH0370.
Full textCarriço, Nuno Filipe Marques. "Transformer approaches on hyper-parameter optimization and anomaly detection with applications in stream tuning." Master's thesis, Universidade de Évora, 2022. http://hdl.handle.net/10174/31068.
Full textParra, Martinez Juan Pablo. "On multilayered system dynamics and waves in anisotropic poroelastic media." Doctoral thesis, KTH, VinnExcellence Center for ECO2 Vehicle design, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-195801.
Full textQC 20161110
Bosco, Gilles. "Synthèse et décomposition technologique sur réseaux programmables et ASICs." Phd thesis, Grenoble INPG, 1996. http://tel.archives-ouvertes.fr/tel-00346210.
Full textMcFerran, Ethna. "Health economic evaluation of alternatives to current surveillance in colorectal adenoma at risk of colorectal cancer." Thesis, Queen's University Belfast, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.766286.
Full textTasselli, Josiane. "Etude et realisation de structures bipolaires particulieres a heterojonction gaas-gaaias : application aux circuits integres de type ecl." Toulouse 3, 1986. http://www.theses.fr/1986TOU30019.
Full textKelareva, Elena. "Ship scheduling with time-varying draft restrictions: a case study in optimisation with time-varying costs." Phd thesis, 2014. http://hdl.handle.net/1885/12367.
Full textLopes, Lucas Matheus Caldas Vicente. "Development and optimisation of a prefabricated modular house for the Porto region." Master's thesis, 2021. http://hdl.handle.net/1822/76947.
Full textThe building stock is responsible for 40% of the energy consumption and 36% of greenhouse gas emissions in Europe. The European Energy Performance of Building Directive (EPBD) established instructions to promote building energy performance to mitigate this problem. Since its first publication in 2002, energy efficiency has been increasingly promoted. In particular, the 2010 recast introduced the nearly zero energy building concept (nZEB), a cost-effective building with low energy demand while having most of its energy demand supplied by renewable energy sources (RES). The procedure for developing a nZEB building includes a cost-optimal assessment of the elements and systems of the buildings, which is the cost-effective comparison between reference building solutions and the proposed building solutions. The cost-optimal assessment has fomented researches aiming to find more cost-effective and energy-efficient building solutions. Furthermore, building methods such as modular and offsite construction have been studied for their possible contribution to increasing cost-effectiveness, energy efficiency, and sustainability. In this context, this study focused on developing a modular solution for the external walls to be used in prefabricated housing. The methodology developed in this dissertation includes developing a catalogue for existing modular solutions, designing the studied building, simulating, and optimizing results, and the cost-optimal analysis of the achieved results for a single-family housing. The data was gathered through a Building Energy Model (BEM) analysis in the software Design-Builder running the Energy-Plus engine simulation. The cost-optimal analysis was performed by comparing different combinations of optimised external envelope options and building solutions. The study analysis shows that an external building envelope can be achieved with lower initial and global costs and lower energy needs than traditional construction. This study shows that the cost-optimal solution for the designed building is a light steel frame panel with an MDF wood façade panel of 22mm, an internal OSBIII panel of 15mm and 90mm Mineral wool insulation material.
O ambiente construído é responsável por 40% da energia consumida e 36% das emissões de gases com efeito de estufa na Europa. A Diretiva para o Desempenho Energéticos dos Edifícios (EPBD) estabeleceu instruções para promover o desempenho energético e térmico de edifícios para mitigar este problema. Desde a primeira publicação em 2002, a eficiência energética vem sendo fomentada. Em particular, a reformulação em 2010 introduziu o conceito de edifícios com necessidades quase nulas de energia (nZEB), um edifício custoeficaz com baixas necessidades energética que tem a maior parte dessas necessidades sendo fornecida por energias renováveis. O procedimento de desenvolvimento de um nZEB inclui a análise de custo óptimo dos sistemas e elementos do edifício, comparando entre a solução de referência e as soluções propostas. A análise de custo óptimo fomenta pesquisas focadas em achar mais soluções de melhor custo eficácia e de eficiência energética. Ademais, métodos de construção como edifícios modulares e pré-fabricados são estudados por possíveis contribuições para aumento de custo eficácia, eficiência energética e sustentabilidade. Neste contexto, este estudo focou-se no desenvolvimento de uma solução modular para paredes externas para ser utilizada em habitações pré-fabricadas. A metodologia desenvolvida nesta dissertação inclui o desenvolvimento de um catálogo para soluções modulares existentes, a criação do projeto de estudo, simulação e optimização, e análise de custo ótimo para uma habitação unifamiliar. Os dados foram recolhidos por meio de uma análise de um modelo energético de construção (BEM) pelo software Design-Builder utilizando o motor de simulação do Energy-Plus. A análise de custo óptimo foi feita comparando diferentes combinações de envolvente externa optimizada. A análise de estudo mostrou que é possível alcançar uma envolvente com custo inicial, custo total e necessidades energéticas menores quando comparada com a construção tradicional que se pratica no contexto português. Este estudo mostra que a solução de custo óptimo para o edifício projetado é um painel com estrutura em construção metálica leve (LSF), com um placa de madeira MDF de 22 mm na fachada, uma placa interna de painel estrutural com fibras orientadas de madeira (OSB) III de 15 mm, e o isolamento em lã mineral de 90 mm.
Alves, Vítor Hugo Pereira. "Optimisation of synthesis, purification and reformulation of (R)-[N-methyl-¹¹C] PK11195 for in vivo PET imaging studies." Master's thesis, 2012. http://hdl.handle.net/10316/26005.
Full textMarchão, Carla Alexandra da Cruz. "Optimisation and design of post-tensioning anchorage corner blisters in concrete box girder bidges." Doctoral thesis, 2015. http://hdl.handle.net/10362/16071.
Full textSilva, Magda Filipa Carvalho. "Application of ICP-MS in the optimisation of a new methodology for 68Ga production in a PET dedicated cyclotron." Master's thesis, 2016. http://hdl.handle.net/10316/32960.
Full textPopovici, Crina Anca. "Caractérisation de la post-décharge à pression réduite d'un plasma de N₂-O₂ : optimisation des conditions opératoires et maximisation de l'intensité UV émise dans la chambre de stérilisation." Thèse, 2006. http://hdl.handle.net/1866/17378.
Full textFreitas, Diogo Nuno Teixeira. "Nature-inspired algorithms for solving some hard numerical problems." Master's thesis, 2020. http://hdl.handle.net/10400.13/3010.
Full textA Optimização é um ramo da matemática desenvolvido para encontrar as soluções óptimas, de entre todas as possíveis, para um determinado problema. Actualmente, são várias as técnicas de optimização aplicadas a problemas de engenharia, de informática e da indústria. Dada a grande panóplia de aplicações, existem inúmeros trabalhos publicados que propõem métodos para resolver, de forma óptima, problemas específicos. Esta dissertação foca-se na adaptação de dois algoritmos inspirados na natureza que, tendo como base técnicas de optimização, são capazes de calcular aproximações para zeros de polinómios e raízes de equações não lineares e sistemas de equações não lineares. Embora já existam muitos métodos iterativos para encontrar todas as raízes ou zeros de uma função, eles usualmente exigem: (a) deflações repetidas, que podem levar a resultados muito inexactos, devido ao problema da acumulação de erros de arredondamento a cada iteração; (b) boas aproximações iniciais para as raízes para o algoritmo convergir, ou (c) o cálculo de derivadas de primeira ou de segunda ordem que, além de ser computacionalmente intensivo, para muitas funções é impossível de se calcular. Estas desvantagens motivaram o uso da Optimização por Enxame de Partículas (PSO) e de Redes Neurais Artificiais (RNAs) para o cálculo de raízes. Estas técnicas são conhecidas, respectivamente, pela sua capacidade de explorar espaços de dimensão superior (não exigindo boas aproximações iniciais) e pela sua capacidade de modelar problemas complexos. Além disto, tais técnicas não necessitam de deflações repetidas, nem do cálculo de derivadas. Ao longo deste documento, os algoritmos são descritos e testados, usando um conjunto de problemas numéricos com aplicações nas ciências e na engenharia. Os resultados foram comparados com outros disponíveis na literatura e com o método de Durand–Kerner, e sugerem que ambos os algoritmos são capazes de resolver os problemas numéricos considerados.
Rodrigues, David Manuel de Sousa. "Reading the news through its structure: new hybrid connectivity based approaches." Doctoral thesis, 2013. http://hdl.handle.net/10071/8803.
Full textNeste trabalho resolvemos o problema da identificação da estrutura das notícias publicadas em linha por jornais e agências noticiosas. Este problema requer novas abordagens e algoritmos que sejam capazes de lidar com o número crescente de publicações em linha (e que se espera continuam a crescer no futuro). Este facto, juntamente com o elevado grau de interconexão que as notícias apresentam tornam este problema num problema interessante e de difícil resolução. A identificação da estrutura do sistema de notícias foi conseguido quer através da utilização de métodos descritivos que expõem a dimensão das relações existentes entre as diferentes notícias, quer através de algoritmos de agrupamento das mesmas em tópicos. Para atingir este objetivo foi necessário proceder a ao estudo deste sistema complexo sob diferentes perspectivas e abordagens. Após uma fase preparatória do corpo de dados, onde foram recolhidos diversos jornais publicados online optou-se por dois jornais em particular: O Público e o The Guardian. A escolha de jornais em línguas diferentes deve-se à vontade de encontrar estratégias de análise que sejam independentes do conhecimento prévio que se tem sobre estes sistemas. Numa primeira análise é empregada uma abordagem baseada em redes adaptativas e teoria de informação (nomeadamente variação de informação) para identificar tópicos noticiosos que são publicados no jornal português Público. Numa segunda abordagem analisamos a estrutura das notícias publicadas pelo jornal Britânico The Guardian através da construção de séries temporais de notícias. Estas foram seguidamente agrupadas através de um processo de k-means. Para além disso desenvolveuse um algoritmo que permite filtrar de forma não supervisionada notícias irrelevantes que apresentam baixa conectividade às restantes notícias através da utilização de Q-analysis seguida de um processo de clustering. Presentemente este método utiliza otimização de modularidade, mas a técnica é suficientemente geral para que outras abordagens híbridas possam ser utilizadas sem perda de generalidade do método. Desenvolveu-se ainda um novo algoritmo baseado em sistemas de colónias de formigas para solução do problema do caixeiro viajante que consistentemente apresenta resultados melhores que os tradicionais bancos de testes. Este algoritmo foi aplicado na construção de caminhos Hamiltonianos das notícias publicadas utilizando a excentricidade obtida a partir da conectividade do sistema estudado como medida da distância entre notícias. Esta abordagem permitiu construir um sistema de navegação entre as notícias publicadas que é dependente da conectividade observada na estrutura de notícias encontrada. Os resultados apresentados neste trabalho mostram a importância de analisar sistemas complexos na sua multitude de relações e conectividades que não são estáticas e que influenciam a forma como tradicionalmente se olha para sistema multi-dimensionais. Mostra-se que a inclusão desta dimensões extra produzem melhores resultados na resolução do problema de identificar a estrutura subjacente a este problema da publicação de notícias em linha.