Dissertations / Theses on the topic 'Sans Serveur'
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Rafamantanantsoa, Fontaine. "Etude des performances d'un serveur web et d'un réseau local sans fil utilisant les techniques neuronales." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2009. http://tel.archives-ouvertes.fr/tel-00725472.
Full textJeatsa, Toulepi Armel. "Optimisation de l'allocation de la mémoire cache CPU pour les fonctions cloud et les applications haute performance." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEP089.
Full textContemporary IT services are mainly based on two major paradigms: cluster computing and cloud computing. The former involves the distribution of computing tasks between different nodes that work together as a single system, while the latter is based on the virtualization of computing infrastructure, enabling it to be provided on demand. In this thesis, our focus is on last-level cache (LLC) allocation in the context of these two paradigms, concentrating specifically on distributed parallel applications and FaaS functions. The LLC is a shared memory space used by all processor cores on a NUMA socket. As a shared resource, it is subject to contention, which can have a significant impact on performance. To alleviate this problem, Intel has implemented a technology in its processors that enables partitioning and allocation of cache memory: Cache Allocation Technology (CAT).In this work, using CAT, we first examine the impact of LLC contention on the performance of FaaS functions. Then, we study how this contention in a subset of nodes in a cluster affects the overall performance of a running distributed application. From these studies, we propose CASY and CADiA, intelligent LLC allocation systems for FaaS functions and distributed applications respectively. CASY uses supervised machine learning to predict the cache requirements of a FaaS function based on the size of the input file, while CADiA dynamically constructs the cache usage profile of a distributed application and performs harmonized allocation across all nodes according to this profile. These two solutions enabled us to achieve performance gains of up to around 11% for CASY, and 13% for CADiA
Cherif, Amina. "Sécurité des RFIDs actifs et applications." Thesis, Limoges, 2021. http://www.theses.fr/2021LIMO0015.
Full textOver the 30 last years, active RFID devices have evolved from nodes dedicated to identification to autonomous nodes that, in addition, sense (from environment or other sources) and exchange data. Consequently, the range of their applications has rapidly grown from identification only to monitoring and real time localisation. In recent years, thanks to their advantages, the use of active RFID nodes for mobile data collection has attracted significant attention. However, in most scenarios, these nodes are unattended in an adverse environments, so data must be securely stored and transmitted to prevent attack by active adversaries: even if the nodes are captured, data confidentiality must be ensured. Furthermore, due to the scarce resources available to nodes in terms of energy, storage and/or computation, the used security solution has to be lightweight. This thesis is divided in two parts. In the first, we will study in details the evolution of active RFID nodes and their security. We will then, present, in the second part, a new serverless protocol to enable MDCs (Mobile Data Collectors), such as drones, to collect data from mobile and static Active RFID nodes and then deliver them later to an authorized third party. The whole solution ensures data confidentiality at each step (from the sensing phase, before data collection by the MDC, once data have been collected by MDC, and during final delivery) while fulfilling the lightweight requirements for the resource-limited entities involved. To assess the suitability of the protocol against the performance requirements, we will implement it on the most resource-constrained secure devices to prove its efficiency even in the worst conditions. In addition, to prove the protocol fulfills the security requirements, we will analyze it using security games and we will also formally verify it using the AVISPA and ProVerif tools
Hoseini, Leila. "Advantages and Disadvantages of Adopting ERP Systems Served as SaaS from the Perspective of SaaS Users." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-128516.
Full textPANDERS, TOMS. "How to scale SaaS business from local toglobal markets? Case of ad servers." Thesis, KTH, Entreprenörskap och Innovation, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147762.
Full textOrue-Echevarría, Arrieta Leire. "From software as a good to software as a service (SAAS): a methodology to define the transformation towards the SAAS business model." Doctoral thesis, Universitat Abat Oliba, 2016. http://hdl.handle.net/10803/398024.
Full textSe habla de Cloud Computing o computación en la nube como una tecnología disruptiva. Sin embargo, cloud computing es ante todo un modelo de negocio. Empresas proveedoras de software, que distribuyen sus aplicaciones en base a un modelo de licencias se encuentran con la necesidad de cambiar su modelo de negocio para adecuarse a los nuevos tiempos y no perder así cuota de mercado. El enfoque utilizado en este trabajo comienza con una caracterización, basada en estándares, de la aplicación en su estado actual y en el estado ideal futuro en aspectos de tecnología, modelo de negocio y procesos organizacionales, con el objetivo de detectar cómo de lejos se está de ser una aplicación cloud. Una vez realizado este análisis se estudia el impacto que esta migración causa a nivel de procesos organizacionales, costes, beneficios y resultados financieros. El objetivo de esta solución es proveer a los órganos de decisión de la empresa con los mecanismos adecuados para seleccionar la opción más viable que garantice la sostenibilidad de la empresa. Una vez que la decisión de migrar esas aplicaciones legadas ha sido tomada, se comienza con el proceso de migración que, en el caso de las aplicaciones como servicio (SaaS), incluyen una reflexión estratégica de cuál es el modelo de precios y el modelo de negocio asociado y que incluye la reestructuración de la empresa para poder afrontar ese nuevo modelo. En el caso de aplicaciones SaaS, la determinación de la política de precios depende en gran manera del proveedor cloud seleccionado, privado o público, sobre el que desplegar la aplicación, a lo que hay que añadir otras variables como analizar las funcionalidades que demanda el mercado o que el cliente considera de valor añadido y que permiten una entrada más fácil en el competitivo mercado SaaS. Decidir qué estrategia de precios permitirá que la aplicación SaaS sea sostenible a largo plazo puede ser una tarea complicada. Este trabajo presenta una solución sistemática para analizar qué estrategia de precios es la más conveniente para que una aplicación SaaS sea sostenible en el largo. Se han modelado y descompuesto tres estrategias de precios comunes en el mundo de SaaS (pago-por-uso, freemium, por capas), se han calculado los beneficios, así como el efecto de elegir una u otra estrategia en el balance de resultados y en otros indicadores económicos relevantes. Por último, este trabajo presenta una metodología para definir, paso por paso, el modelo de negocio de un proveedor SaaS de acuerdo con cinco pilares: la propuesta de valor, la provisión de valor, el cliente, el mercado o fuerzas externas y las actividades financieras, que incluyen la definición de la estrategia de precios comentada anteriormente. Todas las herramientas presentadas en este trabajo se han ejecutado en distintas pruebas de concepto y reportadas asimismo en este documento.
Cloud computing is still considered as a disruptive technogloy. However, cloud computing is above all a business model. Software providers that distribute their applications following a license-based model are facing the need to change their business model in order to adjust to the new times and thus not lose market quota. The decision of migrating into a SaaS business model against staying with the current business model is challenging. The approach presented in this work begins with a standard-based characterization of the application in its current status and in the ideal future one, in terms of technology, business model and organizational processes, with the aim of deciphering how far the application is of being cloud-compliant. Once this analysis is performed, the impact of this migration is studied, in terms of organizational processes, costs, benefits and financial results. The ultimate goal of this approach is to provide decision makers with mechanisms to select the most viable option so as to guarantee the sustainability of the company. Once the decision of migrating those legacy applications has been taken, and is positive, the migration process starts, that in the case of changing to a SaaS delivery model, includes a strategic reflection of which is the best pricing strategy and accompanying business model, which also involves a complete re-structuring of the organizational processes of the company in order to be able to face such a new business model. In the case of SaaS applications, the determination of the pricing model depends highly on the selected target platform upon which to deploy the application (private cloud or a public one), added to other issues such as determining which features offer added value to the customer and which ones will allow an easy entry in the market, especially when the technology and the product is not well. Deciding which pricing strategy will allow a long-term sustainable SaaS application can be a difficult task. This work presents a systematic approach to analyse which pricing strategy is the most convenient one for a SaaS application to stay sustainable. Three commonly used SaaS pricing strategies have been modelled (pay-per-use, freemium and tiered) and decomposed, recurring revenues calculated and the effect of selecting one or the other in the profit and loss account as well as in other economic indicators in the medium term is presented. Finally, this work presents a methodology to determine the business model of a SaaS provider following a step-by-setp procedure, based on five pillars: the customer, the value proposition, the market or external driving forces, the value delivery and the financial activities, related to the pricing strategy method also described in this work. All the approaches presented along this work have been proven in a set of different proof-of-concepts, that are also reported in this document.
PANDERS, TOMS. "How to scale SaaS business from local to global markets? : Case of ad servers." Thesis, KTH, Entreprenörskap och Innovation, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147698.
Full textSanti, Nina. "Prédiction des besoins pour la gestion de serveurs mobiles en périphérie." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILB050.
Full textMulti-access Edge computing is an emerging paradigm within the Internet of Things (IoT) that complements Cloud computing. This paradigm proposes the implementation of computing servers located close to users, reducing the pressure and costs of local network infrastructure. This proximity to users is giving rise to new use cases, such as the deployment of mobile servers mounted on drones or robots, offering a cheaper, more energy-efficient and flexible alternative to fixed infrastructures for one-off or exceptional events. However, this approach also raises new challenges for the deployment and allocation of resources in terms of time and space, which are often battery-dependent.In this thesis, we propose predictive tools and algorithms for making decisions about the allocation of fixed and mobile resources, in terms of both time and space, within dynamic environments. We provide rich and reproducible datasets that reflect the heterogeneity inherent in Internet of Things (IoT) applications, while exhibiting a high rate of contention and interference. To achieve this, we are using the FIT-IoT Lab, an open testbed dedicated to the IoT, and we are making all the code available in an open manner. In addition, we have developed a tool for generating IoT traces in an automated and reproducible way. We use these datasets to train machine learning algorithms based on regression techniques to evaluate their ability to predict the throughput of IoT applications. In a similar approach, we have also trained and analysed a neural network of the temporal transformer type to predict several Quality of Service (QoS) metrics. In order to take into account the mobility of resources, we are generating IoT traces integrating mobile access points embedded in TurtleBot robots. These traces, which incorporate mobility, are used to validate and test a federated learning framework based on parsimonious temporal transformers. Finally, we propose a decentralised algorithm for predicting human population density by region, based on the use of a particle filter. We test and validate this algorithm using the Webots simulator in the context of servers embedded in robots, and the ns-3 simulator for the network part
Vila, Gimeno Carme. "El Servei d’Urgències de l’Hospital de la Santa Creu i Sant Pau de Barcelona (1967-1986)." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/133349.
Full textThe historical memory presented here aims to describe the history of the Emergency Department of the Hospital de la Santa Creu i Sant Pau in Barcelona , a history that has been elaborated thanks to the contribution of witnesses, written published documents and different private documents. The Emergency Department of the Hospital de Sant Pau, came into being in response to the health and social needs prompted by the arrival of the industrial revolution in the city of Barcelona and the immigration process that followed. These factors led to a very important population increase, not only within the city but also the surrounding area, where there appeared what were called bedroom communities. To achieve the status of being one of the best emergency services at the time, it was necessary to adapt their space functionality achieved with the right wing of the basement of the administration building, adapting the service to the circuit patients who had gone from first aid to the observation room. Despite this demographic movement, the needs created in no way could be covered by existing services, and in these circumstances the Emergency Hospital of Sant Pau opened in 1967. When the hospital was not able to absorb the demands of the population in times of epidemics mainly in winter time, its doors had to be closed at different times. This fact led to a series of demands which became widespread and were made in other Spanish cities, including the idea that Social Security would promote the existence of emergency services in their hospitals and schools. The relationship established between the hospital and the neighbourhood was achieved through a series of talks organized by neighbours associations in the area, in order to give information and health education related to emergencies as a principle, but also informed about health in general, and later, the rights of patients. It introduced the right to decide on the treatment of illnesses and preparation for a dignified death. Health education was carried out with the intention of reaching as many people through neighbourhood associations. In 1978, the Board of Members of the Hospital de la Santa Creu i Sant Pau was founded, which was sponsored by neighbourhood associations. The main objective of the Council was to work to make the voice of users heard by management, on the basis that the administration of public bodies there had to be present. It was obvious that during the previous political regime (it was just over one year since the first democratic elections had taken place) rights were not recognized, and therefore the struggle for popular participation in government, had been part and parcel of the fight for democracy in our country. It was then that democratic formulas prevailed and it was possible to initiate mechanisms for the participation of users in the administrative bodies of public schools. Since then, there has been a procedure recognised by management. A user’s council is an integral part of its structure, as are the implementation and publication of the Letter of Declaration Users Rights (the first document of this kind in Spain) and the service offering suggestions and complaints. So it was during the eighties that Sant Pau Hospital would evolve into a hospital which would be part of Catalonia’s public healthcare network after having been a charity-based, private hospital.
Pokhrel, Jeevan. "Intelligent quality of experience (QoE) analysis of network served multimedia and web contents." Thesis, Evry, Institut national des télécommunications, 2014. http://www.theses.fr/2014TELE0027/document.
Full textToday user experience is becoming a reliable indicator for service providers and telecommunication operators to convey overall end to end system functioning. Moreover, to compete for a prominent market share, different network operators and service providers should retain and increase the customers’ subscription. To fulfil these requirements they require an efficient Quality of Experience (QoE) monitoring and estimation. However, QoE is a subjective metric and its evaluation is expensive and time consuming since it requires human participation. Therefore, there is a need for an objective tool that can measure the QoE objectively with reasonable accuracy in real-Time. As a first contribution, we analyzed the impact of network conditions on Video on Demand (VoD) services. We also proposed an objective QoE estimation tool that uses fuzzy expert system to estimate QoE from network layer QoS parameters. As a second contribution, we analyzed the impact of MAC layer QoS parameters on VoD services over IEEE 802.11n wireless networks. We also proposed an objective QoE estimation tool that uses random neural network to estimate QoE from the MAC layer perspective. As our third contribution, we analyzed the effect of different adaption scenarios on QoE of adaptive bit rate streaming. We also developed a web based subjective test platform that can be easily integrated in a crowdsourcing platform for performing subjective tests. As our fourth contribution, we analyzed the impact of different web QoS parameters on web service QoE. We also proposed a novel machine learning algorithm i.e. fuzzy rough hybrid expert system for estimating web service QoE objectively
Ait, Saadi Amylia. "Coordination of scout drones (UAVs) in smart-city to serve autonomous vehicles." Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASG064.
Full textThe subject of Unmanned Aerial Vehicles (UAVs) has become a promising study field in bothresearch and industry. Due to their autonomy and efficiency in flight, UAVs are considerablyused in various applications for different tasks. Actually, the autonomy of the UAVis a challenging issue that can impact both its performance and safety during the mission.During the flight, the autonomous UAVs are required to investigate the area and determineefficiently their trajectory by preserving their resources (energy related to both altitude andpath length) and satisfying some constraints (obstacles and axe rotations). This problem isdefined as the UAV path planning problem that requires efficient algorithms to be solved,often Artificial Intelligence algorithms. In this thesis, we present two novel approachesfor solving the UAV path planning problem. The first approach is an improved algorithmbased on African Vultures Optimization Algorithm (AVOA), called CCO-AVOA algorithms,which integrates the Chaotic map, Cauchy mutation, and Elite Opposition-based learningstrategies. These three strategies improve the performance of the original AVOA algorithmin terms of the diversity of solutions and the exploration/exploitation search balance. Asecond approach is a hybrid-based approach, called CAOSA, based on the hybridization ofChaotic Aquila Optimization with Simulated Annealing algorithms. The introduction of thechaotic map enhances the diversity of the Aquila Optimization (AO), while the SimulatedAnnealing (SA) algorithm is applied as a local search algorithm to improve the exploitationsearch of the traditional AO algorithm. Finally, the autonomy and efficiency of the UAVare tackled in another important application, which is the UAV placement problem. Theissue of the UAV placement relays on finding the optimal UAV placement that satisfies boththe network coverage and connectivity while considering the UAV's limitation from energyand load. In this context, we proposed an efficient hybrid called IMRFO-TS, based on thecombination of Improved Manta Ray Foraging Optimization, which integrates a tangentialcontrol strategy and Tabu Search algorithms
Richter, Martin. "Systém pro sdílení skenerů po síti." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-264963.
Full textFlorensa, Guiu Rosa. "Evaluación de la calidad y satisfacción del usuario de los Espacios Naturales Protegidos de Montaña. Aplicación al Parc Nacional d'Aigüestortes i Estanys de Sant Maurici." Doctoral thesis, Universitat de Lleida, 2015. http://hdl.handle.net/10803/371150.
Full textActualmente están apareciendo nuevas modalidades de turismo vinculadas con las nuevas demandas y exigencias de la población, surgiendo con fuerza el Ecoturismo, que incluye un conjunto de actividades que tienen como motivación principal la contemplación, disfrute y/o conocimiento del medio natural. Mediante esta investigación se pretende analizar las variables y los inputs que se consideran en los instrumentos utilizados para el seguimiento y la evaluación del uso público de los Espacios Naturales Protegidos, que sirven para identificar y valorar la satisfacción y las expectativas de los visitantes o usuarios, analizando también aspectos relacionados con la calidad y la actividad ecoturística. Se han identificado las variables que han resultado significativas a nivel cuantitativo y cualitativo de las encuestas realizadas en el Parc Nacional d’Aigüestortes i Estany de Sant Maurici con el objetivo de relacionar la satisfacción del usuario con la calidad y se han comparado cualitativamente los parámetros y la idoneidad de la información requerida en distintos modelos de encuestas de satisfacción utilizados los últimos años en distintos Espacios Naturales acreditados con la Q de calidad turística.
New forms of tourism related to the new demands and requirements of the population are appearing currently, such as ecotourism. Ecotourism includes a set of activities whose primary motivation contemplation, enjoyment and/or knowledge of the natural environment. Through this research it is to analyze variables and inputs considered in the instruments used for monitoring and evaluation of public use of Protected Areas It serve to identify and assess the satisfaction and expectations of visitors or users, also analyzing issues related to the quality and ecotourism. We have identified the variables that have been significant in quantitative and qualitative surveys of the Aigüestortes Sant Maurici National Park, in order to relate the user satisfaction with the warm. Also they compared the qualitatively parameters and the adequacy of the information required in various models of satisfaction surveys used the years in various natural areas accredited with the Q for quality.
Maccagnani, Anna. "Studio applicato sull'evoluzione dell'ERP da locale a cloud: il caso Microsoft Dynamics 365 Business Central." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Find full textBelda, Ortega Román. "Mejora del streaming de vídeo en DASH con codificación de bitrate variable mediante el algoritmo Look Ahead y mecanismos de coordinación para la reproducción, y propuesta de nuevas métricas para la evaluación de la QoE." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/169467.
Full text[CA] Aquesta tesi presenta diverses propostes encaminades a millorar la transmissió de vídeo a través de l'estàndard DASH (Dynamic Adaptive Streaming over HTTP). Aquest treball de recerca estudia el protocol de transmissió DASH i les seves característiques. Alhora, planteja la codificació amb qualitat constant i bitrate variable com a manera de codificació del contingut de vídeo més indicada per a la transmissió de contingut sota demanda mitjançant l'estàndard DASH. Derivat de la proposta d'utilització de la manera de codificació de qualitat constant, cobra major importància el paper que juguen els algorismes d'adaptació en l'experiència dels usuaris en consumir el contingut. En aquest sentit, aquesta tesi presenta un algoritme d'adaptació denominat Look Ahead el qual, sense modificar l'estàndard, permet utilitzar la informació de les grandàries dels segments de vídeo inclosa en els contenidors multimèdia per a evitar prendre decisions d'adaptació que desemboquin en una parada indesitjada en la reproducció de contingut multimèdia. Amb l'objectiu d'avaluar les possibles millores de l'algoritme d'adaptació presentat, es proposen tres models d'avaluació objectiva de la QoE. Els models proposats permeten predir de manera senzilla la QoE que tindrien els usuaris de manera objectiva, utilitzant paràmetres coneguts com el bitrate mitjà, el PSNR (Peak Signal-to-Noise Ratio) i el valor de VMAF (Video Multimethod Assessment Fusion). Tots ells aplicats a cada segment. Finalment, s'estudia el comportament de DASH en entorns Wi-Fi amb alta densitat d'usuaris. En aquest context es produeixen un nombre elevat de parades en la reproducció per una mala estimació de la taxa de transferència disponible deguda al patró ON/OFF de descàrrega de DASH i a la variabilitat de l'accés al mitjà de Wi-Fi. Per a pal·liar aquesta situació, es proposa un servei de coordinació basat en la tecnologia SAND (MPEG's Server and Network Assisted DASH) que proporciona una estimació de la taxa de transferència basada en la informació de l'estat dels players dels clients.
[EN] This thesis presents several proposals aimed at improving video transmission through the DASH (Dynamic Adaptive Streaming over HTTP) standard. This research work studies the DASH transmission protocol and its characteristics. At the same time, this work proposes the use of encoding with constant quality and variable bitrate as the most suitable video content encoding mode for on-demand content transmission through the DASH standard. Based on the proposal to use the constant quality encoding mode, the role played by adaptation algorithms in the user experience when consuming multimedia content becomes more important. In this sense, this thesis presents an adaptation algorithm called Look Ahead which, without modifying the standard, allows the use of the information on the sizes of the video segments included in the multimedia containers to avoid making adaptation decisions that lead to undesirable stalls during the playback of multimedia content. In order to evaluate the improvements of the presented adaptation algorithm, three models of objective QoE evaluation are proposed. These models allow to predict in a simple way the QoE that users would have in an objective way, using well-known parameters such as the average bitrate, the PSNR (Peak Signal-to-Noise Ratio) and the VMAF (Video Multimethod Assessment Fusion). All of them applied to each segment. Finally, the DASH behavior in Wi-Fi environments with high user density is analyzed. In this context, there could be a high number of stalls in the playback because of a bad estimation of the available transfer rate due to the ON/OFF pattern of DASH download and to the variability of the access to the Wi-Fi environment. To relieve this situation, a coordination service based on SAND (MPEG's Server and Network Assisted DASH) is proposed, which provides an estimation of the transfer rate based on the information of the state of the clients' players.
Belda Ortega, R. (2021). Mejora del streaming de vídeo en DASH con codificación de bitrate variable mediante el algoritmo Look Ahead y mecanismos de coordinación para la reproducción, y propuesta de nuevas métricas para la evaluación de la QoE [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/169467
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