Dissertations / Theses on the topic 'Optimisation des performances sportives'
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Sedeaud, Adrien. "Caractéristiques anthropométriques et performances de haut niveau : évolutions, indicateurs et optimisations." Thesis, Paris 5, 2013. http://www.theses.fr/2013PA05L003.
Full textThe purpose of this thesis is to study the morphological changes of top athletes and identify structural links between performance and anthropometric characteristics. This thesis is comprised of various studies that analyze the highest level of performance by morphological aspect and different levels of proof. At first, we show differentiated changes between high level athletes and individuals in the general population (Studies 1 and 2), presupposing that athletes draw benefits from their anthropometric characteristics. Then we highlight the direct links between anthropometric characteristics and performance in track and field athletes and rugby players (studies 2 and 5): rugby teams with heavier forwards and taller backs are more successful than others. In track and field, calculated allometric coefficients show the impact of mass depending on the distance of the race and sex, suggesting a possible anthropometric progression margin for female athletes. The third level of supporting evidence, highlights the existence of couples [optimal morphologies - optimal performance], biometric attractors beneficial in scoring in basketball (Study 3), and BMI optimum with performance intervals in race distance (studies 4, 5 and 6). Mass, height and BMI are relevant indicators used to specify athletes between different events (morphological gradients in track and field following the spectrum of distances, like energy gradients) but also according to their level (inverse gradient between mass and height according to middle and long distances and sprints). These three indicators also reveal morphological differentiation depending on the specific position. Being compared, changes in mass and height show asynchronous growth indicative of atypicity. Independent from BMI’s primary function of measuring the body size and obesity, it should be refined as a useful indicator of high level performance. Indeed, it reveals trade-off between power, energy capacity and organization of efficient body structure for high level athletes. In athletic performance, the whole body is in action, and mass, height and BMI take into account the entire athlete who moves. Some conclusions from the findings of this thesis arise new thoughts in the performance understanding and will generate the development of experimental protocols. Physiques are the expression of the performance as well as the organization from which it is realized. The results of this thesis, based on the analysis of consistent databases, provide a new vision on morphological optimizations. For the purpose of performance, it is necessary to know the optimizations established in order to situate athletes in their morphological fields, but also enable them to move towards better anthropometric adaptation specific of their activities
Amiache, Sophie. "Etat bucco-dentaire et performances sportives." Paris 5, 1991. http://www.theses.fr/1991PA05P007.
Full textBouzidi, Carole. "Créations, performances artistiques et sportives : du fantasme à l'oeuvre." Thesis, Toulouse 2, 2018. http://www.theses.fr/2018TOU20036/document.
Full textThe concept of fantasy, in the psychoanalytic field, allows us to explain both the built identity and the investments of the subject. In our litterature revue we show its various aspects. We propose its clinical implications, through publications and interviews from artists and sport players. Our thesis is that fantasy is required to explain the passion linked to an activity (sport or art), but the origin of the passion is still unknown. We promote that it is necessary to subvert a part of fantasy, to be able to achieve an artistic or a sport performance. This double mouvement can explain the enthusiasms that grow around performances
El, Helou Nour. "Evolution des performances sportives : apport de l'épidémiologie pour l'analyse des performances sportives et des influences physiologiques, technologiques, génétiques et environnementales sur les progressions humaines au cours de l'ère olympique." Paris 5, 2011. http://www.theses.fr/2011PA05P603.
Full textThe objective of this thesis is to study the evolution of athletic performance during the Olympic era and try to interpret the physiological, technological, genetic and environmental influences. Mathematical modeling of quantifiable sports performance shows similar trends in all events: they follow a piecewise multi-exponential progression punctuated by historical events. This global vision allows the discovery of a limiting phenomenon common to all disciplines, performance can not continue to grow, and some have already stopped growing. These limitations observed in the field of sports are an indicator of physiological limitations of the human species. The main factors that would allow for further performance improvements are technological innovations. Furthermore genetic predisposition of athletes and their phenotype resulting from interactions between genes and environment, enable them to perform these maximal athletic performances. The majority of world records were beaten by athletes from nations that are among the major world powers, providing a geographical, economic and socio-political environment promoting the development of sport. Thus we suggest that sport is an indicator of the secular economical and political development of a country. The results of this thesis analyzing a large number of data provide new insight into progression abilities: human physiological performance does not evolve in a linear way
Cicut, Nicolas. "Le football, entre ressources symboliques, intégration sociale, optimisation économique et performance sportive : le cas de l’Olympique de Marseille." Thesis, Paris 10, 2020. https://bdr-parisnanterre-fr.faraway.parisnanterre.fr/theses/intranet/2020/2020PA100142/2020PA100142.pdf.
Full textIn the ultra-competitive and globalised professional football industry, sport and financial performance have a prominent place. Competitions and transfer markets are the scene of fierce battles between clubs.Even if they are now far from the top of the hierarchy, some organisations have, throughout their history, gained a notoriety and an aura that brings them constant media attention and maintains them at the heart of an ecosystem made of rich and varied stakeholders. One of these organisations is Olympique de Marseille, a “historical”, popular club with a record that is unique in France and that maintains very strong links with its sympathisers and territory.A literature review on the complex concept of performance shows the importance of non-financial performance in the development strategies of some companies. However, the topic has been little studied when it comes to football clubs and it seems truly interesting to examine the potential benefits linked to the optimisation of societal performance.We articulated our reflection around this axis firstly with a stakeholder approach that lead to identification and prioritisation, then with an in-depth study of the existing interactions which results showed important shortcomings. We then turned our attention towards the understanding of these uncontrolled zones by performing a large qualitative survey in order to determine the cornerstones of the stakeholders’ relations with the club. Finally, the myths and symbols that strengthen these links are analysed through the meticulous study of the narration and speech
Papaix, Caroline. "Optimisation des performances des mémoires EEPROM embarquées." Montpellier 2, 2002. http://www.theses.fr/2002MON20098.
Full textAbed, Belkacem. "Optimisation des performances thermiques d'un séchoir solaire." Valenciennes, 2000. https://ged.uphf.fr/nuxeo/site/esupversions/67dccbbf-3d17-4ca9-b327-8a873a78f8fc.
Full textAïssani, Amina. "Optimisation fiabiliste des performances énergétiques des bâtiments." Thesis, Clermont-Ferrand 2, 2016. http://www.theses.fr/2016CLF22677/document.
Full textIn the context of growing world energy demand and environmental degradation, many actions are undertaken each year to improve the energy performance of buildings. During the design stage, the use of building energy simulations remains a valuable tool as it evaluates the possible options in terms of energy performance and comfort. However, as precision requirements increase, it becomes essential to assess the uncertainties associated with input data in simulation. This thesis focuses on the insulation design process under uncertainty, in order to limit gaps between real and predicted performance for better control of energy consumptions. This work firstly presents the current alarming energy context. We consider the main uncertainties that affect the insulation, mainly the variability of the thermophysical properties, the uncertainty on climate and the uncertainties due to workmanship defects. Experimental studies were carried out to evaluate the uncertainty associated to the intrinsic performance of healthy insulation materials on one hand, and those associated to defects in insulations on the other hand. A coupling between thermography techniques and finite element models was used to provide analytical models that assess the effective thermal performance of a defective insulation, according to the type and size of the defect. As the performance of insulation also depends on climate, it is necessary to integrate future weather data to evaluate the energy consumption. These weather data are generally estimated based on the historical climatic data of the region. However, it is still difficult to predict climate change as it depends on many uncontrollable factors. In this work, we consider the different climate scenarios proposed by climate expert groups, and the uncertainty associated to each scenario to evaluate the reliability of the insulation and to improve the decision making process. Finally, we propose a probabilistic approach to integrate uncertainties in simulation and an optimization methodology based on reliability. A new cost formulation is also proposed to improve the decision-making, through indirect losses related to comfort, pollution and living space losses
Hamiez, Jean-Philippe. "Coloration de graphes et planification de rencontres sportives : heuristiques, algorithmes et analyses." Angers, 2002. http://www.theses.fr/2002ANGE0053.
Full textCharif, Rubial Andrés Salim. "Analyse et optimisation de performances sur architectures multicoeurs." Versailles-St Quentin en Yvelines, 2012. http://www.theses.fr/2012VERS0026.
Full textThe fast increase in the number of cores of modern Chip Multiprocessors (CMP) is not followed by a similar increase of memory bandwidth. Performance depends more and more on access patterns and transformations enhancing spatial or temporal locality are essential for high performance applications. There is a need for performance tuning tools in order to gain a better understanding of issues suffered by parallel applications and thus to harness the ever-increasing available horsepower. In this thesis, we first present the MAQAO performance analysis tool. We show how it combines static and dynamic analyses in order to better understand performance evaluation issues which are generally multifaceted. We then describe the first major contribution of this thesis, a domain specific instrumentation language (DSL) to easily build low-overhead performance evaluation tools. Finally, we propose a tool to characterize the memory behavior of applications, which is the second major contribution. Our work focuses both on single threaded and multi-threaded issues. We use several analyses to detect inefficient access patterns and lookup for issues related to interactions between threads, and their impact on the memory hierarchy (caches)
Ben, Jeddou Roukaya. "Football Selection Optimization through the Integration of Management Theories, AI and Multi-criteria Decision Making." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCG009.
Full textThe research outlined in this thesis falls within the context of professional football club management, where establishing a balance between human and financial aspects is essential for long-term viability of sports organizations. In football management, the traditional methods of player selection have historically guided decision-making processes within clubs. This strategic decision-making process, which is often subjective and uncertain, can have a significant impact on the club's financial, economic and sporting situation.As football is increasingly becoming a data-driven sport, there is a growing recognition that traditional approaches need to be complemented by scientific methods based on artificial intelligenceomenclature{AI}{Artificial Intelligence} and multi-criteria decision makingomenclature{MCDM}{Multi-Criteria Decision Making} approaches to optimize player selection and improve both sporting and financial performance. It is becoming increasingly important to find an optimal balance between sporting success and financial performance to optimize the results of a specific entity: the football club.In this respect, the main purpose of this thesis is to propose a model that combines machine learning techniques with multi-criteria analysis methods to improve the efficiency and objectivity of the football player selection process, while taking into account financial and managerial considerations. Our first contribution is to prioritize the physical, technical, tactical, and behavioral criteria of players using Random Forest, Entropy, and CRITIComenclature{CRITIC}{CRiteria Importance Through Intercriteria Correlation}algorithms. The second contribution is to rank players based on their performance using the TOPSIS method.To validate these contributions, we designed a decision support system that assists the sports decision maker by proposing players in order of performance. Our model does not aim to replace coaches but rather to integrate subjective and objective evaluations to provide a thorough understanding of the factors influencing sporting and managerial performance, thereby improving the accuracy of player selection. As football moves towards more data-oriented approaches, the combination of AI and MCDM can further optimize player selection processes by leveraging the benefits of objective data analysis and subjective expertise.The results obtained show the effectiveness of our approach in improving the performance of football teams, especially when supported and promoted by emotional intelligence, which refers to the manager's ability to recognize the substantial state of the players
Smaili, Khaled. "Modélisation et optimisation des performances de systèmes de production." Toulouse 3, 1993. http://www.theses.fr/1993TOU30203.
Full textRousserie, Florence. "Optimisation des performances de tubes spiralés haut de gamme." Bordeaux 1, 1998. http://www.theses.fr/1998BOR10612.
Full textNikolaidis, Théodoros. "Optimisation des performances ESD de circuits intègres CMOS submicroniques." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0185.
Full textGuiu, Emeline. "Etalonnage de la mission spatiale MICROSCOPE : optimisation des performances." Nantes, 2007. http://www.theses.fr/2007NANT2156.
Full textThe objective ot the MICROSCOPE mission is to verify the Equivalence Principle to a precision never archieved before. The test is based on the precise measurement of a gravitational signal by a differential electrostatic accelerometer on board a microsatellite in free fall. The knowledge of certain inertial or dimensional instrument parameters is crucial for the precision of the calculation, but these parameters cannot be measured on ground with the precision required. Certain procedures are thus planned to determine their exact values in orbit, during a calibration phase preceding the test campaign. As the flight instument cannot function on ground, the procedures must be validated by a computer simulation. The work described in this thesis consists in a proposal of a set of calibration procedures, and the development of a simulation to validate it. The first step of the approach consists in establishing the equations for the satellite dynamics, including the continuous attitude control and drag compensation. The analysis of this model allows the determination of which parameters must be calibrated and then the development of a set of specifications to guarantee their impact on the calibrated measurement is less than the desired precision. The calibration procedures are then designed to identify each paramater, which includes the measurement acquisition scenarios but also the protocols for the data processing. Due to the high precision required, the scenarios are specific and the data processing is inspired by the methods of calculation by intervals. Finally, a detailed simulation of the instrument and its environment is developed to validate the proposed procedures
Bopp-Limoge, Christiane. "L'acupuncture permet-elle d'améliorer les performances sportives ? : étude personnelle à propos de 35 sportifs de haut niveau." Strasbourg 1, 1988. http://www.theses.fr/1988STR1M117.
Full textKassimi, Fodhil. "Optimisation et performances mécaniques et structurales des bétons autoplaçants fibrés." Mémoire, Université de Sherbrooke, 2008. http://savoirs.usherbrooke.ca/handle/11143/1458.
Full textLi, Jie. "Évaluation et optimisation des performances des systèmes de production distribution." Metz, 2006. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2006/Li.Jie.SMZ0610.pdf.
Full textThis thesis considers a production-distribution system made up of a set of production sites and distribution centers connected by the transport facilities. Each distribution center is managed by a given stock management policy. The aim is to find the best parameters setting of the stock management policy through the whole network in order to optimize the overall performances of the production-distribution system while taking into account the finite production capacity, the customer service requirement, the transport time, and the random customer demand. The results obtained during this PhD thesis allowed to develop a methodology of optimization for the parameter setting of inventory control policies management in the production-distribution systems. Thus, we proposed a simulation based optimization approach which computes the setting that minimizes the overall inventory cost of the production-distribution system, while taking into account fill rate constraints. The approach iss validated by a large number of numerical experiments
Thenail, Denis. "Contrôle actif d'impédance et optimisation des performances d'un matériau poreux." Ecully, Ecole centrale de Lyon, 1995. http://www.theses.fr/1995ECDL0011.
Full textIn its most developed version, active control of sound aims to create a cancelling secondary acoustic wave, which destructively interferes with the undesired noise. The performance of this noise reduction strategy is limited by the coherance level of the acoustic field, and by the volume of the zone to be made quiet. For a "large" system, in the presence of an incoherent field, the only potentially effective method to achieve a global noise reduction is to control the acoustic impedance at the walls, and hence to maximize acoustic absorption. Our first method for the active controL of acoustic impedance consists of processing the acoustic pressure and velocity informations close to the control actuator, in order to match the impedance with that of the air. In a KUndt's tube, this method works best for very low frequency excitations. Then, the active absorber is implemented along the lateral wall of a duct. The intensity measurements taken do show the absorption by the control speaker. It is shown through numerical calculations, that sound absorption has to be performed over an extensive area of the surface, as compared to the acoustic wavelenghts in the system. Therefore, we present a second method, which uses active control means to improve the acoustic absorption by a porous layer. We demonstrate through a model and experiments, that the impedance control can be reduced to a simpler acoustic pressure control at the rear face of the absorbent material. Thus, we can consider an extensive application of active absorption of sound at lower cost, a necessary constraint for practical applications
Li, Jie Xie Xiaolan. "Evaluation et optimisation des performances des systèmes de production distribution." [S.l.] : [s.n.], 2006. ftp://ftp.scd.univ-metz.fr/pub/Theses/2006/Li.Jie.SMZ0610.pdf.
Full textSalvadori, Julien. "Caractérisation, optimisation et simulation des performances d’un TEP-TDM numérique." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0294.
Full textPositons emission tomography (PET) is nowadays the most sensitive functional imaging modality for analyzing molecular interactions in the human body. In constant evolution, this modality has recently benefited from silicon photomultisers (SiPM) to replace conventional photomultipliers (PMT), resulting in an overall performance improvement, especially in the temporal resolution used for time-of-flight (TOF) imaging. The performance of the Vereos PET (Philips) involving digital SiPMs (d-SiPM) was evaluated both on phantoms and in clinical conditions by direct comparison with the Ingenuity PET (Philips), involving PMT and comparable acquisition and reconstruction processes. Thus, compared to its analog predecessor, we demonstrated that the Vereos PET offers an improvement in 1) spatial resolution through 1:1 coupling between scintillators and d-SiPM, 2) detectability and contrast-to-noise ratio (CNR) of small lesions due to a better TOF resolution, and 3) in the stability of performances in the upper routine counting rates, due to higher numbers of photodetectors and trigger circuits, thereby reducing dead time and pile-up effects. While the gain in CNR provided by the TOF information is particularly useful for PET examinations performed with low statistics (reduced injected activities and/or recording times), the stability of performance is particularly advantageous in the dynamic exams for which the recorded activities can be initially high. In addition, the Vereos PET was modeled using the GATE platform and this modeling was validated while providing values very close to those obtained experimentally for the NEMA evaluation of the Vereos PET. Finally, a reconstruction environment specific to the Vereos PET and incorporating all the necessary corrections to obtain quantitative images was developed using the CASToR software. These direct (GATE model) and inverse (CASToR reconstruction) modeling of the Vereos digital PET scanner has enabled us to confirm the influence of certain confounding factors for image quality and they could be useful in the future, especially for optimizing imaging performance and evaluating new methods of image reconstruction and correction
Raminosoa, Tsaarafidy. "OPTIMISATION DES PERFORMANCES DES MACHINES SYNCHRO-RELUCTANTES PAR RESEAUX DE PERMEANCES." Phd thesis, Institut National Polytechnique de Lorraine - INPL, 2006. http://tel.archives-ouvertes.fr/tel-00126662.
Full textMichel, Nathalie Catherine. "Optimisation par modélisation numérique des performances acoustiques des matériaux poreux hétérogènes." Mémoire, Université de Sherbrooke, 1999. http://savoirs.usherbrooke.ca/handle/11143/1116.
Full textRaminosoa, Tsarafidy. "Optimisation des performances des machines synchro-réluctantes par réseaux de perméances." Thesis, Vandoeuvre-les-Nancy, INPL, 2006. http://www.theses.fr/2006INPL042N/document.
Full textBecause of its robustness and its low cost, the synchronous reluctance motor (SynRM) is an interesting alternative to the induction motor. At equal losses, a correctly optimized SynRM offers a higher torque and then a higher efficiency. Thus, the SynRM is very comptetitive for high speed, high power or high temperature applications. This thesis intends to optimize massive rotor and flux barrier rotor SynRM to produce the maximum torque with the highest possible power factor. For this purpose, an original non linear reluctance network modeling of synchronous reluctance motors with a massive or a flux barrier rotor was developed. The proposed models are significantly faster than the finite element ones and take accurately into account the saturation of all ferromagnetic parts of the motor. The construction of a flux barrier rotor prototype allowed an experimental validation of the modeling approach
Aline, Michel. "Evaluation et optimisation de performances en délai en technologie CMOS submicronique." Montpellier 2, 2001. http://www.theses.fr/2001MON20075.
Full textDestré, Christian. "Optimisation de performances et de coûts pour des structures de communication." Evry-Val d'Essonne, 2004. http://www.theses.fr/2004EVRY0027.
Full textThese last years, telecommunication networks and data-processing networks have converged. Their operation is subject to the constraints of the various used components and their organization must provide a whole of services with some quality. Our global objective is to optimize some performance parameters while minimizing costs. This thesis details two problems : 1) The description of routing functions in all-optical WDM networks which induce optimal paths while using a minimal number of wavelengths. 2) The fairest possible cost sharing of a broadcast tree between participants. We have expressed these two problems in algorithmic optimization problems. We obtain general results (NP-Complete study, approximation algorithms) and, for the particular case of Meshes, theoretical and experimental refined results
Michel, Nathalie Catherine. "Optimisation par modélisation numérique des performances acoustiques des matériaux poreux hétérogènes." Sherbrooke : Université de Sherbrooke, 1999.
Find full textRaminosoa, Tsarafidy Sargos François-Michel. "Optimisation des performances des machines synchro-réluctantes par réseaux de perméances." S. l. : S. n, 2006. http://www.scd.inpl-nancy.fr/theses/2006_RAMINOSOA_T.pdf.
Full textGuichard, Florent. "Combinaison cohérente d'impulsions femtoseconde - Optimisation des performances des amplificateurs fibrés ultracourts." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLO001.
Full textOptical fiber-based ultrafast laser sources are nowadays used in numerous scientific and industrial applications. To extend further the number of possible applications, it is essential to improve their performances in terms of pulsewidth, energy per pulse, and average power. Extensive research work has been performed over the last years on this area. The work described in this manuscript is a contribution to these research efforts, and aims at improving ultrafast fiber laser sources by using coherent combination of several femtosecond pulses.The first part is devoted to energy scaling by using passive coherent combining architectures, that do not require a feedback control loop of the relative optical phase between pulses to be combined. This idea is used both in the space (combining beams) and time (combining replicas of the pulse at different delays) domains. We demonstrate that these techniques allow energy scaling and study their limitations related to optical nonlinearities and gain saturation in the amplifiers. We also propose ways to circumvent these limitations.In the second part, we study various ways of decreasing the output pulsewidth of fiber-amplified femtosecond sources. First, we implement an active coherent combining system that performs combination of two amplified femtosecond pulses with different, shifted spectral content. This allows the synthesis of a pulse that is shorter than any of the individual pulses to be combined. Another studied approach consists in tailoring the spectrum of input pulses to precompensate the spectral gain shape of the amplifier. Finally, by using passive combining architectures described in the first part, we demonstrate energy scaling of temporal nonlinear compression setups
Montemont, Guillaume. "Optimisation des performances de détecteurs CdTe et CdZnTe en spectrométrie gamma." Université Joseph Fourier (Grenoble ; 1971-2015), 2000. http://www.theses.fr/2000GRE10172.
Full textYahya, Eslam. "Modélisation, analyse et optimisation des performances des circuits asynchrones multi-protocoles." Grenoble INPG, 2009. http://www.theses.fr/2009INPG0145.
Full textAsynchronous circuits show potential interest from many aspects. However modeling, analysis and optimization of asynchronous circuits are stumbling blocks to spread this technology on commercial level. This thesis concerns the development of asynchronous circuit modeling method which is based on analytical models for the underlying handshaking protocols. Based on this modeling method, a fast and accurate circuit analysis method is developed. This analysis provides a full support for statistically variable delays and is able to analyze different circuit structures (Linear/Nonlinear, Unconditional/Conditional). In addition, it enables the implementation of timing analysis, power analysis and process-effect analysis for asynchronous circuits. On top of these modeling and analysis methods, an optimization technique has been developed. This optimization technique is based on selecting the minimum number of asynchronous registers required for satisfying the performance constraints. By using the proposed methods, the asynchronous handshaking protocol effect on speed, power consumption distribution and effect of process variability is studied. For validating the proposed methods, a group of tools is implemented using C++, Java and Matlab. These tools show high efficiency, high accuracy and fast time response
Bouttier, Clément. "Optimisation globale sous incertitude : algorithmes stochastiques et bandits continus avec application aux performances avion." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30176.
Full textThis PhD thesis is dedicated to the theoretical and numerical analysis of stochastic algorithms for the stochastic flight planning problem. Optimizing the fuel consumption and flight time is a key factor for airlines to be competitive. These companies thus look for flight optimization tools with higher and higher accuracy requirements. However, nowadays available methodologies for flight planning are based on simplified aircraft performance models. In this PhD, we propose to fulfill the accuracy requirements by adapting our methodology to both the constraints induced by the utilization of an industrial aircraft performance computation code and the consideration of the uncertainty about the real flight conditions, i.e., air traffic and weather conditions. Our proposal is supported by three main contributions. First, we design a numerical framework for benchmarking aircraft trajectory optimization tools. This provides us a unified testing procedure for all aircraft performance models. Second, we propose and study (both theoretically and numerically) two global derivative-free algorithms for stochastic optimization problems. The first approach, the NSA algorithm, is highly generic and does not use any prior knowledge about the aircraft performance model. It is an extension of the simulated annealing algorithm adapted to noisy cost functions. We provide an upper bound on the convergence speed of NSA to globally optimal solutions. The second approach, the SPY algorithm, is a Lipschitz bandit algorithm derived from Piyavskii's algorithm. It is more specific as it requires the knowledge of some Lipschitz regularity property around the optimum, but it is therefore far more efficient. We also provide a theoretical study of this algorithm through an upper bound on its simple regret
Hmad, Ouadie. "Evaluation et optimisation des performances de fonctions pour la surveillance de turboréacteurs." Thesis, Troyes, 2013. http://www.theses.fr/2013TROY0029.
Full textThis thesis deals with monitoring systems of turbojet engines. The development of such systems requires a performance evaluation and optimization phase prior to their introduction in operation. The work has been focused on this phase, and more specifically on the performance of the detection and the prognostic functions of two systems. Performances metrics related to each of these functions as well as their estimate have been defined. The monitored systems are, on the one hand, the start sequence for the detection function and on the other hand, the oil consumption for the prognostic function. The used data come from flights in operation without degradation, simulations of degradation were necessary for the performance assessment. Optimization of detection performance was obtained by tuning a threshold on the decision statistics taking into account the airlines requirements in terms of good detection rate and false alarm rate. Two approaches have been considered and their performances have been compared for their best configurations. Prognostic performances of over oil consumption, simulated using Gamma processes, have been assessed on the basis of the relevance of maintenance decision induced by the prognostic. This thesis has allowed quantifying and improving the performance of the two considered functions to meet the airlines requirements. Other possible improvements are proposed as prospects to conclude this thesis
Badache, Messaoud. "Modélisation et optimisation des performances thermiques d'un mur solaire à perforations (UTC)." Mémoire, École de technologie supérieure, 2010. http://espace.etsmtl.ca/254/1/BADACHE_Messaoud.pdf.
Full textLovric, Davor. "Optimisation coûts/performances des bétons autoplaçants : utilisation des fillers et cendres volantes." Mémoire, Université de Sherbrooke, 2005. http://savoirs.usherbrooke.ca/handle/11143/1272.
Full textUsseglio-Viretta, François. "Optimisation des performances et de la robustesse d’un électrolyseur à hautes températures." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI036/document.
Full textThe thermal, electrochemical and mechanical response of a high temperature steam electrolyzer (HTSE) has been analyzed in this work. To this end, a multi-physics and multi-scale modelling approach has been employed: • A local model, at the microstructure scale of the electrodes, has been used to analyze the apparent electrochemical behavior of the electrodes related to the studied electrolysis cell. System operation, in a stack of several cells, has been then analyzed using a thermoelectrochemical model at the macroscopic scale of the HTSE. An element of experimental validation of the model comes with the results. • A thermomechanical model for the calculation of the stress state of the HTSE has been developed. In this model, the intrinsic physical phenomena of the cell, of its operation under current at high temperatures and those ascribable to the mechanical interactions between the cell and its environment have been considered. The unknown data required for the models have been obtained by the characterization and homogenization calculations of the three-dimensional microstructure of the electrodes. Besides, the viscoplastic behavior of the cathode material has been determined by a four-point bending creep test. The study made it possible to define an optimal operating zone, ensuring both high electrochemical performances and acceptable temperature levels. Proposals aiming to reduce the mechanical damage of the system have been also produced
Riyanto. "Simulation, optimisation, et analyse de performances pour les systèmes industriels d'acquisition d'images." Toulouse, INPT, 1997. http://www.theses.fr/1997INPT107H.
Full textNavet, Nicolas. "Évaluation de performances temporelles et optimisation de l'ordonnancement de tâches et messages." Vandoeuvre-les-Nancy, INPL, 1999. http://docnum.univ-lorraine.fr/public/INPL_T_1999_NAVET_N.pdf.
Full textOusset, Michel. "Modélisation et optimisation des performances des structures digitales en arséniure de gallium." Montpellier 2, 1994. http://www.theses.fr/1994MON20196.
Full textBoussahoua, Mohamed. "Optimisation de performances dans les entrepôts de données distribués NoSQL en colonnes." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSE2007.
Full textThe work presented in this thesis aims at proposing approaches to build data warehouses (DWs) by using the columnar NoSQL model. The use of NoSQL models is motivated by the advent of big data and the inability of the relational model, usually used to implement DW, to allow data scalability. Indeed, the NoSQL models are suitable for storing and managing massive data. They aredesigned to build databases whose storage model is the "key/value". Other models, then, appeared to account for the variability of the data: column oriented, document oriented and graph oriented. We have used the column NoSQL oriented model for building massive DWs because it is more suitable for decisional queries that are defined by a set of columns (measures and dimensions) from warehouse. Column family NoSQL databases offer storage techniques that are well adapted to DWs. Several scenarios are possible to develop DWs on these databases. We present in this thesis new solutions for logical and physical modeling of columnar NoSQL data warehouses. We have proposed a logic model called NLM (Naive Logical Model) to represent a NoSQL oriented columns DW and enable a better management by columnar NoSQL DBMS. We have proposed a new method to build a distributed DW using a column family NoSQL database. Our method is based on a strategy of grouping attributes from fact tables and dimensions, as families´ columns. In this purpose, we used two algorithms, the first one is a meta-heuristic algorithm, in this case the Particle Swarm Optimization : PSO, and the second one is the k-means algorithm. Furthermore, we have proposed a new method to build an efficient distributed DW inside column family NoSQL DBMSs. Our method based on the association rules method that allows to obtain groups of frequently used attributes in the workload. Hence, the partition keys RowKey, necessary to distribute data onto the different cluster nodes, are composed of those attributes groups.To validate our contributions, we have developed a software tool called RDW2CNoSQ (Relational Data Warehouse to Columnar NoSQL) to build a distributed data warehouse using a column family NoSQL Database. Also, we conducted several tests that have shown the effectiveness of different method that we proposed. Our experiments suggest that defining a good data partitioning and placement schemes during the implementation of the data warehouse with NoSQL HBase increase significantly the computation and querying performances
Dukan, Laurent. "Etude critique et optimisation d'un système d'acquisition analogique-numérique rapide hautes performances." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37617804v.
Full textVigneri, Luigi. "Les véhicules comme un mobile cloud : modélisation, optimisation et analyse des performances." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4055/document.
Full textThe large diffusion of handheld devices is leading to an exponential growth of the mobile traffic demand which is already overloading the core network. To deal with such a problem, several works suggest to store content (files or videos) in small cells or user equipments. In this thesis, we push the idea of caching at the edge a step further, and we propose to use public or private transportation as mobile small cells and caches. In fact, vehicles are widespread in modern cities, and the majority of them could be readily equipped with network connectivity and storage. The adoption of such a mobile cloud, which does not suffer from energy constraints (compared to user equipments), reduces installation and maintenance costs (compared to small cells). In our work, a user can opportunistically download chunks of a requested content from nearby vehicles, and be redirected to the cellular network after a deadline (imposed by the operator) or when her playout buffer empties. The main goal of the work is to suggest to an operator how to optimally replicate content to minimize the load on the core network. The main contributions are: (i) Modelling. We model the above scenario considering heterogeneous content size, generic mobility and a number of other system parameters. (ii) Optimization. We formulate some optimization problems to calculate allocation policies under different models and constraints. (iii) Performance analysis. We build a MATLAB simulator to validate the theoretical findings through real trace-based simulations. We show that, even with low technology penetration, the proposed caching policies are able to offload more than 50 percent of the mobile traffic demand
Souakri, Sonia. "Optimisation des performances d'un procédé industriel d'électrofiltration alimenté par hautes puissances pulsées." Thesis, Pau, 2016. http://www.theses.fr/2016PAUU3028/document.
Full textThe fight against air pollution is a major issue in the twenty-first century. The center of Marcouleof CEA develops different waste treatment processes by incineration / vitrification that generatecombustion gases requiring treatment. To do this, the CEA uses the electrostatic precipitation, atechnical waste gas treatment employed for thin particles filtration.This thesis is dedicated to optimizing the performance of an electrofilter supplied by high pulsedpowered. One of the goals is to size and achieve a new emissive electrode adapted to thedevelopment of a new incineration process. This new electrode coupled to its High Voltage (HV)power supply, which electrical parameters were optimized, allowed to obtain maximum filtrationefficiency during operating times in line with industrial applications. The impact of thephysicochemical characteristics of dusts on the filtration efficiency was analyzed.A specific study also focused on the evolution of different discharge conditions that develop inthe electrofilter to identify the phenomena responsible for the process efficiency fall. The intake ofthe emissive electrode and a hybrid generator, combining a continuous background voltagesuperimposed with impulses, has clearly been demonstrated by their effects on back coronainitiation and therefore on the optimal efficiency operation duration
Hnayno, Mohamad. "Optimisation des performances énergétiques des centres de données : du composant au bâtiment." Electronic Thesis or Diss., Reims, 2023. http://www.theses.fr/2023REIMS021.
Full textData centers consume vast amounts of electrical energy to power their IT equipment, cooling systems, and supporting infrastructure. This high energy consumption contributes to the overall demand on the electrical grid and release of greenhouse gas emissions. By optimizing energy performance, data centers can reduce their electricity bills, overall operating costs and their environmental impact. This includes implementing energy-efficient technologies, improving cooling systems, and adopting efficient power management practices. Adopting new cooling solutions, such as liquid cooling and indirect evaporative cooling, offer higher energy efficiency and can significantly reduce the cooling-related energy consumption in data centres.In this work, two experimental investigations on a new cooling topologies for information technology racks are conducted. In the first topology, the rack-cooling system is based on a combination of close-coupled cooling and direct-to-chip cooling. Five racks with operational servers were tested. Two temperature difference (15 K and 20 K) was validated for all the IT racks. The impact of these temperature difference profiles on the data-centre performance was analysed using three heat rejection systems under four climatic conditions for a data centre of 600 kW. The impact of the water temperature profile on the partial power usage effectiveness and water usage effectiveness of data centre was analysed to optimise the indirect free cooling system equipped with an evaporative cooling system through two approaches: rack temperature difference and by increasing the water inlet temperature of the data centre. In the second topology, an experimental investigation conducted on a new single-phase immersion/liquid-cooling technique is developed. The experimental setup tested the impact of three dielectric fluids, the effect of the water circuit configuration, and the server power/profile. Results suggest that the system cooling demand depends on the fluid’s viscosity. As the viscosity increased from 4.6 to 9.8 mPa.s, the cooling performance decreased by approximately 6 %. Moreover, all the IT server profiles were validated at various water inlet temperatures up to 45°C and flow rates. The energy performance of this technique and the previous technique was compared. This technique showed a reduction in the DC electrical power consumption by at least 20.7 % compared to the liquid-cooling system. The cooling performance of the air- and liquid-cooled systems and the proposed solution was compared computationally at the server level. When using the proposed solution, the energy consumed per server was reduced by at least 20 % compared with the air-cooling system and 7 % compared with liquid-cooling system.In addition, a new liquid cooling technology for 600 kW Uninterruptible Power Supply (UPS) units. This cooling architecture gives more opportunities to use free cooling as a main and unique cooling system for optimal data centres (DCs). Five thermal hydraulic tests are conducted with different thermal conditions. A 20 K temperature difference profile was validated with a safe operation for all UPS electronic equipment resulting with a thermal efficiency of 82.27 %. The impact of decreasing water flow rate and increasing water and air room temperatures was also analysed. A decrease in inlet water and air temperatures from 41°C to 32°C and from 47°C to 40°C respectively increases the thermal efficiency by 8.64 %. Furthermore, an energy performance analysis comparison is made between air cooled and water cooled UPS units on both UPS and infrastructure levels
Omeme, Ada Arielle Mélissa. "Optimisation des performances hygrothermiques des matériaux biosourcés pour application dans le bâtiment." Electronic Thesis or Diss., Amiens, 2022. http://www.theses.fr/2022AMIE0074.
Full textThe environmental concern has given rise to various reflections in order to meet two essential requirements: reduce energy consumption and impact on the external environment, and ensure the quality and comfort of buildings. It is obvious that the solutions used today are not universal and their effectiveness depends on many factors such as the surrounding climate, the type of use, etc. The choice of materials used and the understanding of the basic physical phenomena related to the climate are essential factors for the success of the design of a building with high environmental and energy qualities. The use of bio-based materials in construction (agricultural co-products) is a rapidly developing approach worldwide that aims to limit the use of fossil fuels and reduce the energy bill. Among the new materials, those developed based on agro-resources have been the subject for several years of renewed interest and resumption of studies, highlighting their ability to regulate ambient hygric variations. However, the literature review shows that these materials have a low thermal inertia that could be improved by using the phase change material (PCM) that can absorb and release heat energy when phase change occurs depending on the imposed temperature conditions. The aim of the thesis is to study the hygrothermal performance of hemp concrete and hemp coating incorporating phase change materials for application in the building
Kadaoui, Abbassi Jalal. "Méthodes analytiques d'évaluation de performances de réseaux de files d'attente." Paris 9, 1999. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1999PA090054.
Full textBernier, Marjorie. "Exploration et optimisation des focalisations attentionnelles des sportifs experts à travers une approche naturaliste : une contribution en golf et en patinage artistique." Paris 11, 2010. http://www.theses.fr/2010PA113008.
Full textAttentional focus has been examined by many studies based on experimental protocols aiming to test the effectiveness of some kinds of attentional focus on motor learning and on performance. The goal of this doctoral dissertation was to throw new light on this notion by using a naturalistic approach, i. E. By examining the attentional focus of expert athletes in natural performance settings. Both areas of research were dealt with in this work : (a) the exploration and (b) the optimization of attentional focus in expert athletes. Four studies were conducted with adults and young athletes with very high levels of expertise in two sports characterized by their technical aspects: golf and figure skating. The exploratory studies in chapter 1, based on different qualitative methods (self confrontation interviews, qualitative data coding, "event listing" display) revealed a categorization of attentional focus according to content and different characteristics. They also showed the dynamic nature of focus : athletes direct their attention successively to different foci that seem adapted to the situation (training vs. Competition) and to the sport (golf vs. Fiure skating). Expert athletes regulate their foci by means of self-regulation processes, presented through the prism of the "third wave" of cognitive and behavioural approaches. Chapter 2 examined the effectiveness of the latter approaches to optimize attentional focus in expert athletes. Single case research designs and case studies made it possible to test the effectiveness of interventions, based on the third wave of cognitive and behavioural approaches, on attentional focus regulation and the performance of young elite golfers and skaters. Results showed that developing mindfulness skills can contribute to optimizing attentional focus in performance situations. Discussion of the results of the four studies suggests research and application perspectives
Gravisse, Nicolas. "Administration de DHEA chez le sujet jeune et sain : effets sur les performances sportives, la composition corporelle et les réponses hormonales." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2059.
Full textThe administration of dehydroepiandrosterone (DHEA) is prohibited by the World Anti-Doping Agency (WADA) due to its potential ergogenic effect. This effect would be mediated by the transformation of DHEA in testosterone, known for its anabolic effect. Yet, the effect on sports performance has received little attention in healthy young men and has never been studied in healthy young women.The main goal of our work was therefore to evaluate the effects of short-term DHEA administration on sports performance for these populations. In a randomized, double blind, crossover study, 10 young men and 11 young women, recreational athletes, have taken 100 mg/day of DHEA and a placebo over two 28-day periods separated by a washout period of 28 days. At the beginning and at the end of each treatment period, anaerobic and aerobic performances were evaluated,respectively with the Running-based Anaerobic Sprint Test (RAST) and the 20-m shuttle run test. We have also measured body composition, physiologic and psychologic responses as well as dietary intake. Neither the performances both for RAST and 20-m shuttle run test, nor the body composition have been significantly altered by the DHEA intake in both men and women. In saliva, DHEA has induced a significant increase in testosterone for women (x 20). This increased has been more moderate for men (x 2.3). Among the dietary intake criteria, only the lipid intake has increased and only for men. No change in the adipokine levels and the psychological parameters has been noted for both genders. For women, it would be interesting to complete this work with the administration of multiple doses throughout the day
Revol, Bertrand. "Modélisation et optimisation des performances CEM d'une association variateur de vitesse – machine asynchrone." Phd thesis, Université Joseph Fourier (Grenoble), 2003. http://tel.archives-ouvertes.fr/tel-00006396.
Full textSoro, Wassy Isaac. "Modélisation et optimisation des performances et de la maintenance des systèmes multi-états." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/27614/27614.pdf.
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