Дисертації з теми "Migration dans le Cloud"
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Djiken, Guy Lahlou. "La mobilité du code dans les systèmes embarqués." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1112/document.
With the advent of nomadism, mobile devices, virtualization and cloud computing in recent years, new problems have arisen taking into account ecological concerns, energy management, quality of service, security standards and many other aspects related to our societies. To solve these problems, we define the concept of Cloudlet as a local cloud where virtual devices and embedded applications can be virtualized. Then, we design a distributed architecture based on this architectural pattern related to cloud computing and virtualization of resources. These notions allow us to position our work among other approaches to offload mobile applications in a Cloudlet.On the other hand, a network of Cloudlets helps to secure the activity carried out on a mobile device by offloading embedded applications in a running virtual machine in the Cloudlet, and also to monitor users during their movements.These definitions guided us towards writing formal specifications via a higher order processes of algebra. They facilitate the calculation of operational semantics for different case studies based on this Cloudlet concept. These specifications foster a new vision for designing virtual devices suitable to all devices, sensors or actuators. This set of equations constitutes a formal definition relevant not only for prototyping a Cloudlet but also for constructing a timed automata system.Following the structure of our specifications, we built a model of timed automata for a network of Cloudlets. Exploiting the model checking techniques, we have established temporal properties showing that any execution of a mobile application on a mobile device could be offloaded in a Cloudlet depending on a given software architecture. This work resulted in making technical choices leading to a prototype of such a distributed architecture using an OSGi server. A first result leads us to define a software architecture for mobile applications. Secondly, we implement the principle of migration to a Cloudlet neighbor. Our tests validate our initial choices and confirm the hypotheses of our work. They allow taking measures in order to assess the cost of an offloading to a Cloudlet during runtime, as well as keeping track during user’s movements
Oulaaffart, Mohamed. "Automating Security Enhancement for Cloud Services." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0232.
The advances in virtualization techniques and the maturity of orchestration languages have contributed to the design and deployment of cloud composite services. These cloud services may be subject to changes over time, due to the migration of their resources. This may introduce new vulnerabilities, that compromise the whole services. In that context, this thesis proposes to enhance and automate the security of cloud composite services, according to three main axes. The first axis consists in an automated SMT-based security framework for supporting migrations in cloud composite services, such as those orchestrated with the TOSCA (Topology and Orchestration Specification for Cloud Applications) language. It relies on verification techniques for automatically assessing the configuration changes that affect the components of cloud services during their migrations and determining adequate countermeasures. The second axis investigates the design of an inter-cloud trusted third party, called C3S-TTP (Composite Cloud Configuration Security-Trusted Third Party). This one is capable to perform a precise and exhaustive vulnerability assessment, without requiring the cloud provider and the cloud tenant to share critical configuration information between each other. The third axis is centered on the investigation of a moving target defense strategy which combines artificial intelligence algorithms together with verification techniques. The purpose is to deceive reconnaissance activities performed by attackers through a large exploration of states, while minimizing the occurrence of new vulnerabilities that may impact on the attack surface of cloud composite services
Rosinosky, Guillaume. "Élasticité de l’exécution des processus métier." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0003/document.
The availability of middleware platforms in the cloud, with "transparent" scalability, is a progress for software developers and integrators. They can develop and deploy their applications without worrying about technical details. However, the exploitation cost of a cloud infrastructure can quickly become important. Providers requires methods to reduce this cost by adapting the size of ressources to the needs of the customers. In this thesis, we focus on multi-tenant transactional web applications, more precisely on business processes execution engines. We propose methods allowing to optimize the operational costs of providers of business process execution "as a Service" (BPMaaS) while ensuring a sufficient level of quality of service. This type of application do not scale well because of its persistence tier and of the transactional nature of operations. One must distribute the customers installations in order to optimize the cost, and sometimes move them depending of the needs of the customers. These moves (or migrations) have an impact on the quality of service and they must be limited. First, we propose a method for measuring the size of resources in terms of BPM tasks throughput, and then a method for measuring the impact of migrations we evaluate, thus confirming our hypothesis. We also propose several linear optimization models and heuristics targeting resouce allocation and distribution of customers, while limiting the number of migrations. These models are based on the knowledge of the needs of customers per time slot. We have experimented our three methods on the BPM solution Bonita, and demonstrated that they provide substantial savings on the infrastructure exploitation compared to a basic method
Thiam, Cheikhou. "Anti load-balancing for energy-aware distributed scheduling of virtual machines." Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2441/.
The multiplication of Cloud computing has resulted in the establishment of largescale data centers around the world containing thousands of compute nodes. However, Cloud consume huge amounts of energy. Energy consumption of data centers worldwide is estimated at more than 1. 5% of the global electricity use and is expected to grow further. A problem usually studied in distributed systems is to evenly distribute the load. But when the goal is to reduce energy consumption, this type of algorithms can lead to have machines largely under-loaded and therefore consuming energy unnecessarily. This thesis presents novel techniques, algorithms, and software for distributed dynamic consolidation of Virtual Machines (VMs) in Cloud. The main objective of this thesis is to provide energy-aware scheduling strategies in cloud computing for energy saving. To achieve this goal, we use centralized and decentralized approaches. Contributions in this method are presented these two axes. The objective of our approach is to reduce data center's total energy consumed by controlling cloud applications' overall energy consumption while ensuring cloud applications' service level agreement. Energy consumption is reduced by dynamically deactivating and reactivating physical nodes to meet the current resource demand. The key contributions are: - First, we present an energy aware clouds scheduling using anti-load balancing algorithm : concentrate the load on a minimum number of severs. The goal is to turn off the machines released and therefore minimize the energy consumption of the system. - The second axis proposed an algorithm which works by associating a credit value with each node. The credit of a node depends on its affinity to its jobs, its current workload and its communication behavior. Energy savings are achieved by continuous consolidation of VMs according to current utilization of resources, virtual network topologies established between VMs, and thermal state of computing nodes. The experiment results, obtained with a simulator which extends CloudSim (EnerSim), show that the cloud application energy consumption and energy efficiency are being improved. - The third axis is dedicated to the consideration of a decentralized dynamic scheduling approach entitled Cooperative scheduling Anti-load balancing Algorithm for cloud. It is a decentralized approach that allows cooperation between different sites. To validate this algorithm, we have extended the simulator MaGateSim. With an extensive experimental evaluation with a real workload dataset, we got the conclusion that both the approach using centralized and decentralized algorithms can reduce energy consumed by data centers
Aissioui, Abdelkader. "Le chemin vers les architectures futures des services mobiles : du Follow Me Cloud (FMC) au Follow Me edge Cloud (FMeC)." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLV095.
This Ph.D. thesis aims to deal with the future delivery architectures of mobile cloud-based services, through network infrastructures evolving from Mobile Cloud Computing (MCC) to Mobile Edge Computing (MEC). We mainly focused on Follow Me Cloud (FMC) concept as a new service delivery strategy for improved user experience and efficient resource utilization. That enables cloud-based services to follow their mobile users during their movement across access network technologies and by delivering the cloud-service via the optimal service point inside the cloud infrastructure. Several contributions are proposed in this thesis and evaluated in both theoretical analysis and scientific simulation.First, we proposed an alternative FMC architecture that allows: (i) to open the FMC design on non-3GPP mobile network access technologies (ii) to provide interoperability among different PMIPv6 domains permitting MNs inter-PMIPv6 domain roaming with seamless IP mobility and service session continuity (iii) to offer a tunnel-free architecture in MNs roaming situation, avoiding any additional overhead associated with tunneling in mobility management. This proposed scheme leverage SDN/OpenFlow technology and PMIPv6 mobility management protocol by integrating them within a framework permitting to realize the FMC vision.Second, to address the scalability and resiliency concerns in centralized SDN/OpenFlow control plane architecture, we introduced a new design of an elastic distributed SDN controller tailored for Mobile Cloud Computing (MCC) and more notably for Follow Me Cloud (FMC) management systems. We illustrated how the new control plane scheme is distributed on two-level hierarchical architecture, a first level with a single global SDN controller and a second level with several local SDN controllers. Then, we presented the building blocks of our novel control plane framework, the system Key Performance Indicator (KPI) computation and set the key objective of our design aiming to keep the system KPI value within a predefined threshold window. Last, we proved how this goal is achieved by adapting the number of local SDN controllers and their locations in an elastic manner and deploying them as VNF instances on the cloud thanks to NFV technology.Third, we introduced FMeC concept, leveraging the intertwining of MEC and FMC architectures with the aim of sustaining requirements of the 5G automotive systems. We began by defining FMeC key concept elements permitting to provide FMC technology at the edge of mobile networks. Then, we presented an automated driving use case projection of our FMeC solution integrating automotive with Telco infrastructures towards the future 5G automotive vision. Focusing on the V2I/N communications types, we introduced our FMeC design architecture based on SDN/OpenFlow technologies and MEC infrastructure entities whose resources are pooled together to provide a federated edge clouds. Finally, we presented our mobility-aware framework for edge-cloud service placement based on a set of basic algorithms that permit achieving the automated driving QoS requirements in terms of ultra-short latency within 5G network
Rosinosky, Guillaume. "Élasticité de l’exécution des processus métier." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0003.
The availability of middleware platforms in the cloud, with "transparent" scalability, is a progress for software developers and integrators. They can develop and deploy their applications without worrying about technical details. However, the exploitation cost of a cloud infrastructure can quickly become important. Providers requires methods to reduce this cost by adapting the size of ressources to the needs of the customers. In this thesis, we focus on multi-tenant transactional web applications, more precisely on business processes execution engines. We propose methods allowing to optimize the operational costs of providers of business process execution "as a Service" (BPMaaS) while ensuring a sufficient level of quality of service. This type of application do not scale well because of its persistence tier and of the transactional nature of operations. One must distribute the customers installations in order to optimize the cost, and sometimes move them depending of the needs of the customers. These moves (or migrations) have an impact on the quality of service and they must be limited. First, we propose a method for measuring the size of resources in terms of BPM tasks throughput, and then a method for measuring the impact of migrations we evaluate, thus confirming our hypothesis. We also propose several linear optimization models and heuristics targeting resouce allocation and distribution of customers, while limiting the number of migrations. These models are based on the knowledge of the needs of customers per time slot. We have experimented our three methods on the BPM solution Bonita, and demonstrated that they provide substantial savings on the infrastructure exploitation compared to a basic method
Sangupamba, Mwilu Odette. "De la business intelligence interne vers la business intelligence dans le cloud : modèles et apports méthodologiques." Electronic Thesis or Diss., Paris, CNAM, 2018. http://www.theses.fr/2018CNAM1168.
BI and cloud computing are two major areas of computer science research and in particular in information system. A research combining these two concepts has a double interest : On the one hand, in business, the BI becomes increasingly an important part of the information system which requires investment in terms of computing performance and data volumes. On the other hand, cloud computing offers new opportunities to manage data for analysis.Given the possibilities of cloud, migration question of the information system including BI is of great interest. In particular, researchers must provide models and methods to help professional in BI migration to the cloud.The research question is : how to migrate BI to the cloud?In this thesis, we address this issue using design science research approach. We implement a decision-making help for BI migration to the cloud based on taxonomies. We provide an operational guidance model that is instantiated by a BI taxonomy in the cloud and from that rules for BI migration to the cloud are arised
Sangupamba, Mwilu Odette. "De la business intelligence interne vers la business intelligence dans le cloud : modèles et apports méthodologiques." Thesis, Paris, CNAM, 2018. http://www.theses.fr/2018CNAM1168/document.
BI and cloud computing are two major areas of computer science research and in particular in information system. A research combining these two concepts has a double interest : On the one hand, in business, the BI becomes increasingly an important part of the information system which requires investment in terms of computing performance and data volumes. On the other hand, cloud computing offers new opportunities to manage data for analysis.Given the possibilities of cloud, migration question of the information system including BI is of great interest. In particular, researchers must provide models and methods to help professional in BI migration to the cloud.The research question is : how to migrate BI to the cloud?In this thesis, we address this issue using design science research approach. We implement a decision-making help for BI migration to the cloud based on taxonomies. We provide an operational guidance model that is instantiated by a BI taxonomy in the cloud and from that rules for BI migration to the cloud are arised
Segalini, Andrea. "Alternatives à la migration de machines virtuelles pour l'optimisation des ressources dans les centres informatiques hautement consolidés." Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4085.
Server virtualization is a technology of prime importance in contemporary data centers. Virtualization provides two key mechanisms, virtual instances and migration, that enable the maximization of the resource utilization to decrease the capital expenses in a data center. In this thesis, we identified and studied two contexts where traditional virtual instance migration falls short in providing the optimal tools to utilize at best the resource available in a cluster: idle virtual machines and largescale hypervisor upgrades.Idle virtual machines permanently lock the resources they are assigned only to await incoming user requests. Indeed, while they are most of the time idle, they cannot be shut down, which would release resources for more demanding services. To address this issue, we propose SEaMLESS, a solution that leverages a novel VM-to-container migration that transforms idle Linux virtual machines into resource-less proxies. SEaMLESS intercepts new user requests while virtual machines are disabled, transparently resuming their execution upon new signs of activity. Furthermore, we propose an easy-to-adopt technique to disable virtual machines based on the traditional hypervisor memory swapping. With our novel suspend-to-swap, we are able to release the majority of the memory and CPU seized by the idle instances, yet providing a fast resume.In the second part of the thesis, we tackle the problem of large-scale upgrades of the hypervisor software. Hypervisor upgrades often require a machine reboot, forcing data center administrators to evacuate the hosts, relocating elsewhere the virtual machines to protect their execution. As this evacuation is costly, both in terms of network transfers and spare resources needed in the data center, hypervisor upgrades hardly scale. We propose Hy-FiX and Multi-FiX, two in-place upgrade that do not consume resource external to the host. Both solutions leverage a zero-copy migration of virtual machines within the host, preserving their execution state across the hypervisor upgrade. Hy-FiX and Multi-FiX achieve scalable upgrades, with only limited impact on the running instances
Ema, Ismat. "Sensitive Data Migration to the Cloud." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-64736.
Grahn, Cecilia, and Martin Sund. "Cloud computing - Moving to the cloud." Thesis, Högskolan Dalarna, Informatik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:du-12916.
Cloud computing involves the use of computer resources that are available through a network, usually the Internet and it is an area that has grown rapidly in recent years. More and more companies move entire or part of their operations to the cloud.Sogeti in Borlänge needs to move their development environments to a cloud service as operating and maintaining of these are costly and time-consuming. As a Microsoft Partner, Sogeti wants to use Microsoft´s services for cloud computing, Windows Azure, for this purpose. Migration to the cloud is a new area for Sogeti and they do not have any descriptions of how this process works.Our mission was to develop an approach for the migration of an IT-solution to the cloud. Part of the mission included the identifying of cloud computing, its components, benefits and drawbacks, which lead to us acquiring basic knowledge of the subject.To develop an approach to migration, we performed several migrations of virtual machines to Windows Azure, and based on these migrations, literature studies and interviews we drew conclusions that resulted in an overall approach for migration to the cloud.The results have shown that it is difficult to make a general but detailed description of an approach to migration, as the scenario looks different depending on what to migrate and what type of cloud service is used. However, based on our experiences from our migrations, along with literature, documents and interviews we have lifted our knowledge to a general level. From this knowledge, we have compiled a general approach with greater focus on the preparatory activities that an organization should implement before migration.Our studies also resulted in an in-depth description of cloud computing. In our studies we did not find previous works in which the critical success factors have been described in the context of cloud computing. In our empirical work, we identified three critical success factors for cloud computing and in doing so covered up some of the knowledge gap in between.
Wallskog, Pappas Alexis. "Migration of Legacy Applications to the Cloud- A Review on Methodology and Tools for Migration to the Cloud." Thesis, Umeå universitet, Institutionen för datavetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-96673.
Ellison, Martyn. "Evaluating cloud migration options for relational databases." Thesis, University of York, 2017. http://etheses.whiterose.ac.uk/20206/.
Ng, Alexander CB. "Decision Modelling and Optimization for Enterprise Migration to Clouds." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31719.
Boronin, Mikhail. "Hybrid Cloud Migration Challenges. A case study at King." Thesis, Uppsala universitet, Informationssystem, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-413540.
Albarrán, Munoz Isaac, and Ruiz De Azúa Manuel Parras. "Telecommunication Services’ Migration to the Cloud : Network Performance analysis." Thesis, KTH, Kommunikationssystem, CoS, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93841.
Actualmente, los servicios de telecomunicaciones se implementan comúnmente en redes privadas, controladas y mantenidas por los operadores de telecomunicaciones, por proveedores de servicios de colocación o, hasta cierto punto, por proveedores de hardware y software. Sin embargo, con el presente desarrollo de la tecnología de ’Cloud computing’, se puede considerar la posibilidad de implementar servicios de telecomunicaciones en la nube, aprovechando su alta disponibilidad, distribución geográfica y facilidad de uso. Además, este cambio puede reducir las preocupaciones de los operadores en relación al mantenimiento del hardware y de la red, delegando en los proveedores del servicio de ’Cloud computing’, los cuáles deberán proporcionar un servicio consistente, cumpliendo así con los requisitos de los servicios de telecomunicaciones. Por otra parte, la virtualización propociona la posibilidad de cambiar rápida y fácilmente la topología de la red, facilitando la adición y supresión de maquinas y servicios, y, por tanto, permitiendo a los operadores adaptarse a sus necesidades sobre la marcha. El objetivo de esta tésis es analizar y evaluar en nivel de rendimiento, desde el punto de vista de la red, que se puede conseguir usando recursos de ’Cloud computing’ para implementar un servicio de telecomunicaciones, llevando a cabo experimentos tanto en el laboratorio como en un entorno real. Estos análisis fueron realizados utilizando un prototipo de un servidor de conmutación móvil (MSC-S) de Ericsson, aunque los resultados pueden adaptarse a otras aplicaciones con unos requisitos similares. Para probar esta propuesta en un entorno real, se realizó una encuesta de proveedores de servicios de ’Cloud computing’, con el objetivo de evaluar sus servicios teniendo en cuenta nuestros requisitos de hardware y red. Finalmente, un proveedor fue escogido y su servicio evaluado basándonos en los requisitos de la aplicación MSC-S. En este documento proporcionamos los resultados de esa evaluación y los comparamos con los obtenidos en el laboratorio. Los resultados de ambas evaluaciones fueron satisfactorios e indican la posibilidad de implementar servicios de telecomunicaciones en la nube, siempre que la nube cumpla los requisitos impuestos por dichos servicios de telecomunicaciones.
Nuförtiden är telekommunikationstjänster ofta uppsatta i privata nätverk, som kontrolleras och underhålls av teleoperatörerna själva, av samlokaliserande tjänsteleverantörer eller i viss utsträckning av deras hårdvaruoch programvaru-leverantörer. Med den nuvarande utvecklingen av Cloud Computing-resurser kan man dock överväga om dessa tjänster kan och bör genomföras i ett Cloud, vilket drar fördel av Cloud Computings höga tillgänglighet, geografiska spridning, och enkla användning. Denna migration minskar även teleoperatörernas oro angående hårdvaru- och nätverks-underhåll genom att överlåta detta till Cloud Computing-leverantörerna, som kommer att behöva leverera en hög tillgänglighet och konsekvent service för att uppfylla telekommunikationstjänsternas krav. Dessutom ger virtualisering möjlighet att enkelt och snabbt ändra ett Clouds nätverkstopologi, vilket underlättar tillägg och borttagning av maskiner och tjänster, vilket hjälper teleoperatörer att snabbt anpassa sig till deras krav. Målet med examensarbetet är att analysera och uppskatta prestandan, från nätets perspektiv, som kan uppnås vid användning av Cloud Computingresurser för att genomföra en teletjänst, genom praktiska experiment både i laboratorium och i verkligheten. Dessa mätningar och analyser utfördes med en prototyp av en Ericsson mobilomkopplingscentralserverapplikation (MSCS), även om de erhållna resultaten skulle kunna anpassas till andra program med liknande krav. För att potentiellt kunna testa denna metod i en verklig miljö användes en tidigare leverantörs undersökning för att utvärdera deras tjänster baserat på våra krav på hårdvara och nätverksegenskaper, och genom detta välja en lämplig kandidatmiljö för våra syften. En Cloud-leverantör valdes och dess tjänster utvärderades vidare baserat på MSC-Ss applikationskrav. Vi redovisar resultatet av vår testprocess i den här miljön och jämför det med resultaten av tester i laboratoriemiljö. Resultaten från båda uppsättningarna av tester var väl korrelerade och visar på potentialen av att implementera telekommunikationstjänster i en Cloud-miljö, om detta Cloud uppfyller de kraven som ställs av telekommunikationtjänsterna.
Svärd, Petter. "Dynamic Cloud Resource Management : Scheduling, Migration and Server Disaggregation." Doctoral thesis, Umeå universitet, Institutionen för datavetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-87904.
Do, Manh Duc. "Green Cloud - Load Balancing, Load Consolidation using VM Migration." TopSCHOLAR®, 2017. https://digitalcommons.wku.edu/theses/2059.
De, Alwis Adambarage. "Microservice-based reengineering of enterprise systems for cloud migration." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/211471/1/Adambarage_De%20Alwis_Thesis.pdf.
Ghiselli, Nicola. "Edge-to-Cloud Service Migration in Constrained Internet of Things Scenarios." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Dhiman, Ashok. "Analysis of on-premise to cloud computing migration strategies for enterprises." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/70796.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 72-73).
In recent years offering and maturity in Cloud Computing space has gained significant momentum. CIOs are looking at Cloud seriously because of bottom line savings and scalability advantages. According to Gartner's survey in early 2010 of 1600 CIOs around the world, Cloud computing and virtualization were on top of their list. This interest has also resulted in slew of products and services from existing IT players as well as new comers which promise to offer many solutions to pave the path towards Cloud computing adoption by enterprises. As organizations get on to the Cloud computing bandwagon they are looking at their current IT setup and looking at the best way they can take advantage of what Cloud has to offer. For a given enterprises, getting on to Cloud might be a complete new start from scratch, a limited deployment of new applications or migration of part of existing applications integrating backwards with on-premise applications. To take advantage of the Cloud, enterprise will need to define their short and long term Cloud strategy. They will need to consider factors specific to their businesses and determine their requirements, risks and benefits. Proper investigation by the enterprise will give them insight in to the benefits and specific strategy they need to follow to gain the said benefits from Cloud. This Thesis analyzes specific strategies which enterprises can adopt, both from business and technology perspective to make sure the migration and integration between on-premise and Cloud happens with minimal disruption to business and results in maximum sustainable cost benefit. It presents the current state of On-Premise IT and Cloud Computing space and then compares them to come up with enterprise specific variables based on which one can make Cloud migration decisions. Finally, Thesis presents the broad frameworks for "migration to Cloud" and confirms the same by interviewing enterprise managers involved in Cloud migration. There are various ways to slice and approach the Cloud migration - but all should take in to consideration the business processes, architecture of existing systems, architecture of available Cloud services, interoperability between on-premise and Cloud applications, maturity of Cloud and standards, short and long term cost savings, sustainability, data/security/regulation, user adoption, available Service Level Agreements (SLAs) and business criticality.
by Ashok Dhiman.
S.M.in Engineering and Management
Chikh, Haidar. "APOLLO : A System for Proactive Application Migration in Mobile Cloud Computing." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-59623.
Cardoso, Abílio. "Applicability of IT service management in the migration to cloud computing." Doctoral thesis, Universidade Portucalense, 2015. http://hdl.handle.net/11328/1297.
The cloud computing (CC) paradigm is transforming the way Information Technology (IT) services are provided by converting IT products into services. This modification allows the delivery of IT services to end users in a way the customers stop purchasing products and start purchasing services instead. The successful migration to this paradigm by an organization requires a deep comprehension of its own IT as well as the dynamics of CC. To this purpose, a framework aggregating the activities that must be undertaken in two groups, the on premise and the off premise, was developed. The on premise group includes the actions developed by the customer, such as the development of a strategy plan, the attainment of a detailed definition of the organization processes and services and the definition of what to migrate to the cloud. The activities developed with the support of the candidates and selected CSPs are in the off premise group. This group encompasses activities such as the providers services’, the details ‘identification of the technologies related to the implementation of the organization processes into the cloud and the analysis of the conditions of service level agreement and the contract. Furthermore, there is already an extensive set of recommendations for IT management and IT governance in general – such as the Information Technology Infrastructure Library (ITIL) and the Control Objectives for Information and related Technology (COBIT) recommendations. However, the field of CC remains poorly covered. Acknowledging this state of affairs and adding the fact that CC is concerned with IT services, not to mention the number of organizations using ITIL in order to manage their IT services, the fact that ITIL is being recognized as a set of good practices, led to the decision of studying the applicability of service management, namely ITIL, to the migration of IT services to CC. The motivation of this study is related to the circumstance that organizations can take advantage of the work already carried out, the information gathered and the management of services when implementing ITIL. Additionally, if the customer and the supplier implement ITIL, the communication between them is also improved. Accordingly, a framework to migrate IT services, applications data and infrastructures to CC has been developed and the processes of this framework have been mapped to the ITIL’s framework.
O paradigma da computação em nuvem está a transformar a forma como os serviços de Tecnologia de Informação estão a ser disponibilizados, convertendo os produtos de TI em serviços. De modo a que as organizações consigam uma migração bem-sucedida para este paradigma necessitam de uma compreensão profunda das suas tecnologias de informação bem como o conhecimento da dinâmica da computação em nuvem. Neste sentido, foi desenvolvido um framework que agrega as atividades que devem ser realizadas na migração em dois grandes conjuntos: o “on-premise” e o “off-premise”. Estes agregam as atividades que devem ser realizadas para migrar os serviços de TI de um ambiente tradicional para a computação em nuvem. O grupo “on-premise” engloba as atividades que devem ser realizadas pela organização, tais como o desenvolvimento de um plano estratégico, a descrição pormenorizada dos serviços e processos existentes bem como a definição do que deve ser migrado para a computação em nuvem. As atividades realizadas em colaboração com os provedores de serviços são englobadas no grupo “off-premise”. Este engloba atividades tais como, a elaboração de uma lista detalhada dos serviços fornecidos pelos fornecedores de serviços, a identificação dos detalhes das tecnologias utilizadas e condições dos níveis de serviço. Por outro lado, existe um grande número de recomendações relacionadas com a gestão de serviços e governança de TI em geral, tais como a ITIL e o COBIT, que, no entanto, não cobrem por completo o paradigma da computação em nuvem. Reconhecendo este problema, paralelamente com o facto do objetivo da computação em nuvem ser os serviços, o grande número de organizações que utilizam a ITIL para gerir os seus serviços de TI, a ITIL ser reconhecida como um conjunto de boas práticas mundialmente utilizadas decidiuse estudar a aplicabilidade da gestão de serviços, nomeadamente a ITIL, à migração de serviços para a computação em nuvem. A motivação para este estudo prende-se com a vantagem que as organizações podem usufruir do trabalho já realizado, da informação reunida e da gestão de serviços obtida aquando da implementação e utilização da ITIL. Adicionalmente, se o cliente e o fornecedor de serviços utilizarem a ITIL, a comunicação entre eles é também facilitada. De modo a responder às questões levantadas pela migração para a computação em nuvem e a aplicabilidade da ITIL a esta migração, foi desenvolvido um framework para suportar as organizações no processo de migração para a computação em nuvem e os processos deste framework mapeados na ITIL.
Orientação: Professor Doutor Fernando Moreira e Professor Doutor Paulo Simões.
El, Rheddane Ahmed. "Elasticité dans le cloud computing." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENM003/document.
Real world workloads are often dynamic. This makes the static scaling of resourcesfatally result in either the waste of resources, if it is based on the estimatedworst case scenario, or the degradation of performance if it is based on the averageworkload. Thanks to the cloud computing model, resources can be provisioned ondemand and scaling can be adapted to the variations of the workload thus achievingelasticity. However, after exploring the existing works, we find that most elasticityframeworks are too generic and fail to meet the specific needs of particularapplications. In this work, we use autonomic loops along with various elasticitytechniques in order to render different types of applications elastic, namelya consolidation service, message-oriented middleware and a stream processingplatform. These elastic solutions have been implemented based on open-sourceapplications and their evaluation shows that they enable resources’ economy withminimal overhead
Zhang, Gong. "Data and application migration in cloud based data centers --architectures and techniques." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41078.
Alkhalil, Adel. "A model to support the decision process for migration to cloud computing." Thesis, Bournemouth University, 2016. http://eprints.bournemouth.ac.uk/24525/.
Pasumarthy, Sarat Chandra. "Live Migration of Virtual Machines in the Cloud : An Investigation by Measurements." Thesis, Blekinge Tekniska Högskola, Institutionen för kommunikationssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-10770.
Zhu, Jiedan. "An Autonomic Framework Supporting Task Consolidation and Migration in the Cloud Environment." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1310758418.
Anwar, Mahwish. "Virtual Firewalling For Migrating Virtual Machines In Cloud Computing." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6080.
Email: mahwish.anwar@gmail.com Twitter: Mah__Wish
ORCID ID: 0000-0001-7486-5216
Teyeb, Hana. "Optimisation intégrée dans un environnement cloud." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLL010/document.
In geo-distributed cloud systems, a key challenge faced by cloud providers is to optimally tune and configure their underlying cloud infrastructure. An important problem in this context, deals with finding an optimal virtual machine (VM) placement, minimizing costs while at the same time ensuring good system performance. Moreover, due to the fluctuations of demand and traffic patterns, it is crucial to dynamically adjust the VM placement scheme over time. Hence, VM migration is used as a tool to cope with this problem. However, despite the benefits brought by VM migration, in geo-distributed cloud context, it generates additional traffic in the backbone links which may affect the application performance in both source and destination DCs. Hence, migration decisions need to be effective and based on accurate parameters. In this work, we study optimization problems related to the placement, migration and scheduling of VMs hosting highly correlated and distributed applications within geo-distributed DCs. In this context, we propose an autonomic DC management tool based on both online and offline optimization models to manage the distributed cloud infrastructure. Our objective is to minimize the overall expected traffic volume circulating between the different DCs of the system. To deal with different types of communication traffic patterns, we propose both deterministic and stochastic optimization models to solve VM placement and migration problem and to cope with the uncertainty of inter-VM traffic. Furthermore, we propose near-optimal algorithms that provide with the best inter-DCs migration sequence of inter-communicating VMs. Along with that, we study the impact of the VM's lifetime on the migration decisions in order to maintain the stability of the cloud system. Finally, to evaluate and validate our approach, we use experimental tests as well as simulation environments. The results of the conducted experiments show the effectiveness of our proposals
Teyeb, Hana. "Optimisation intégrée dans un environnement cloud." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLL010.
In geo-distributed cloud systems, a key challenge faced by cloud providers is to optimally tune and configure their underlying cloud infrastructure. An important problem in this context, deals with finding an optimal virtual machine (VM) placement, minimizing costs while at the same time ensuring good system performance. Moreover, due to the fluctuations of demand and traffic patterns, it is crucial to dynamically adjust the VM placement scheme over time. Hence, VM migration is used as a tool to cope with this problem. However, despite the benefits brought by VM migration, in geo-distributed cloud context, it generates additional traffic in the backbone links which may affect the application performance in both source and destination DCs. Hence, migration decisions need to be effective and based on accurate parameters. In this work, we study optimization problems related to the placement, migration and scheduling of VMs hosting highly correlated and distributed applications within geo-distributed DCs. In this context, we propose an autonomic DC management tool based on both online and offline optimization models to manage the distributed cloud infrastructure. Our objective is to minimize the overall expected traffic volume circulating between the different DCs of the system. To deal with different types of communication traffic patterns, we propose both deterministic and stochastic optimization models to solve VM placement and migration problem and to cope with the uncertainty of inter-VM traffic. Furthermore, we propose near-optimal algorithms that provide with the best inter-DCs migration sequence of inter-communicating VMs. Along with that, we study the impact of the VM's lifetime on the migration decisions in order to maintain the stability of the cloud system. Finally, to evaluate and validate our approach, we use experimental tests as well as simulation environments. The results of the conducted experiments show the effectiveness of our proposals
Azraoui, Monir. "Vérifiabilité et imputabilité dans le Cloud." Thesis, Paris, ENST, 2016. http://www.theses.fr/2016ENST0032/document.
This thesis proposes more efficient cryptographic protocols that enable cloud users to verify (i) the correct storage of outsourced data and (ii) the correct execution of outsourced computation. We first describe a cryptographic protocol that generates proofs of retrievability, which enable data owners to verify that the cloud correctly stores their data. We then detail three cryptographic schemes for verifiable computation by focusing on three operations frequent in data processing routines, namely polynomial evaluation, matrix multiplication and conjunctive keyword search. The security of our solutions is analyzed in the provable security framework and we also demonstrate their efficiency thanks to prototypes. We also introduce A-PPL, an accountability policy language that allows the expression of accountability obligations into machine-readable format. We expect our contributions to foster cloud adoption by organizations still wary of using this promising paradigm
Azraoui, Monir. "Vérifiabilité et imputabilité dans le Cloud." Electronic Thesis or Diss., Paris, ENST, 2016. http://www.theses.fr/2016ENST0032.
This thesis proposes more efficient cryptographic protocols that enable cloud users to verify (i) the correct storage of outsourced data and (ii) the correct execution of outsourced computation. We first describe a cryptographic protocol that generates proofs of retrievability, which enable data owners to verify that the cloud correctly stores their data. We then detail three cryptographic schemes for verifiable computation by focusing on three operations frequent in data processing routines, namely polynomial evaluation, matrix multiplication and conjunctive keyword search. The security of our solutions is analyzed in the provable security framework and we also demonstrate their efficiency thanks to prototypes. We also introduce A-PPL, an accountability policy language that allows the expression of accountability obligations into machine-readable format. We expect our contributions to foster cloud adoption by organizations still wary of using this promising paradigm
Raina, Ravi. "A systems perspective on cybersecurity in the cloud : frameworks, metrics and migration strategy." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107602.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 119-124).
Cloud computing represents the next generation of disruptive technologies in computing. However, there are several barriers to massive adoption of cloud and among them security remains one of the principal concerns. Traditional failure analysis and prevention frameworks fall exceedingly short to address cybersecurity as is evident by every increasing cybersecurity breaches. New frameworks for cybersecurity are required which take a holistic view of the problem and a systems perspective. Migrating to cloud also represents a key decision point for CEO/CTO's today, especially from security perspective. The objective of this thesis is to illustrate the effectiveness of taking a Systems Approach to cybersecurity and provide a framework for migration to cloud with specific emphasis on critical cybersecurity issues pertaining to various cloud deployment models and delivery services. The thesis is divided into three phases. Firstly, it will aim to explore the major security threats and critical areas of focus for security in cloud. It will explore the major security frameworks, metrics and controls, especially the major ones from NIST, CIS and CSA. SLA's for different cloud service models will then be presented. A high level cloud migration framework strategy and framework, with special emphasis on cybersecurity will also be discussed. In the second phase, System- Theoretic Accident Model and Processes (STAMP) which is based on Systems Theory will be applied to Target security breach and key recommendations as well as new insights will be presented. The analysis will highlight the need for holistic approach and Systems Thinking to cybersecurity and new insights that are not produced by traditional methods will be presented. Finally, in the third phase, the cloud migration framework discussed in phase one will be applied to Target. A case will be made that in certain scenarios, moving the less critical applications to cloud and utilizing the security benefits of cloud can actually reduce the threat vectors and security exposures and bring IT systems from a higher risk state to lower risk state. The thesis integrates cybersecurity methods and frameworks as well as security metrics with the cloud migration strategy. Additionally, it also presents STAMP/CAST failure model for cybersecurity breaches and highlights the need for integrated view of safety and security and Systems Thinking in cybersecurity both in traditional systems and cloud.
by Ravi Raina.
S.M. in Engineering and Management
Medhioub, Houssem. "Architectures et mécanismes de fédération dans les environnements cloud computing et cloud networking." Thesis, Evry, Institut national des télécommunications, 2015. http://www.theses.fr/2015TELE0009/document.
Presented in the literature as a new technology, Cloud Computing has become essential in the development and delivery of IT services. Given the innovative potential of Cloud, our thesis was conducted in the context of this promising technology. It was clear that the Cloud would change the way we develop, manage and use information systems. However, the adoption and popularization of Cloud were slow and difficult given the youth of the concepts and heterogeneity of the existing solutions. This difficulty in adoption is reflected by the lack of standard, the presence of heterogeneous architectures and APIs, the introduction of Vendor Lock-In imposed by the market leaders and the lack of cloud federation principles and facilitators. The main motivation for our PhD is to simplify the adoption of the cloud paradigm and the migration to cloud environments and technologies. Our goal has consequently been to improve interoperability and enable federation in the cloud. The thesis focused on two main areas. The first concerns the convergence of future networks and clouds and the second the improvement of federation and interoperability between heterogeneous cloud solutions and services. Based on our work in state of the art about Cloud Computing and Cloud Networking, we defined in this thesis two architectures for Cloud federation. The first architecture enables the merging (convergence) of Cloud Computing and Cloud Networking. The second architecture addresses interoperability between services and proposes cloud-brokering solutions. The study enabled the identification of two essential components for cloud federation, namely: a generic interface and a message exchange system. These two components have been two contributions of our thesis. The proposed federation architectures and these two components summarize the four major contributions of our work
Medhioub, Houssem. "Architectures et mécanismes de fédération dans les environnements cloud computing et cloud networking." Electronic Thesis or Diss., Evry, Institut national des télécommunications, 2015. http://www.theses.fr/2015TELE0009.
Presented in the literature as a new technology, Cloud Computing has become essential in the development and delivery of IT services. Given the innovative potential of Cloud, our thesis was conducted in the context of this promising technology. It was clear that the Cloud would change the way we develop, manage and use information systems. However, the adoption and popularization of Cloud were slow and difficult given the youth of the concepts and heterogeneity of the existing solutions. This difficulty in adoption is reflected by the lack of standard, the presence of heterogeneous architectures and APIs, the introduction of Vendor Lock-In imposed by the market leaders and the lack of cloud federation principles and facilitators. The main motivation for our PhD is to simplify the adoption of the cloud paradigm and the migration to cloud environments and technologies. Our goal has consequently been to improve interoperability and enable federation in the cloud. The thesis focused on two main areas. The first concerns the convergence of future networks and clouds and the second the improvement of federation and interoperability between heterogeneous cloud solutions and services. Based on our work in state of the art about Cloud Computing and Cloud Networking, we defined in this thesis two architectures for Cloud federation. The first architecture enables the merging (convergence) of Cloud Computing and Cloud Networking. The second architecture addresses interoperability between services and proposes cloud-brokering solutions. The study enabled the identification of two essential components for cloud federation, namely: a generic interface and a message exchange system. These two components have been two contributions of our thesis. The proposed federation architectures and these two components summarize the four major contributions of our work
Opara-Martins, Justice. "A decision framework to mitigate vendor lock-in risks in cloud (SaaS category) migration." Thesis, Bournemouth University, 2017. http://eprints.bournemouth.ac.uk/29907/.
Carreño, Emmanuell Diaz. "Migration and evaluation of a numerical weather prediction application in a cloud computing infrastructure." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/127446.
The usage of clusters and grids has benefited for years the High Performance Computing (HPC) community. These kind of systems have allowed scientists to use bigger datasets and to perform more intensive computations, helping them to achieve results in less time but has also increased the upfront costs associated with this area of science. As some e-Science projects are carried out also in highly distributed network environments or using immense data sets that sometimes require grid computing, they are good candidates for cloud computing initiatives. The Cloud Computing paradigm has emerged as a practical solution to perform large-scale scientific computing. The elasticity of the cloud and its pay-as-you-go model presents an attractive opportunity for applications commonly executed in clusters or supercomputers. In this context, the user does not need to buy infrastructure, the resources can be rented from a provider and used for a period of time. This thesis presents the challenges and solutions of migrating a numerical weather prediction (NWP) application to a cloud computing infrastructure. We performed the migration of this HPC application and evaluated its performance in a local cluster and the cloud using different instance sizes. We analyzed the main characteristics of the application running in the cloud. The experiments demonstrate that, although processing and networking create a limiting factor, storing input and output datasets in the cloud presents an attractive option to share results and ease the deployment of a test-bed for a weather research platform. Results show that cloud infrastructure can be used as a viable HPC alternative for numerical weather prediction software.
Aslam, Mudassar. "Secure Service Provisioning in a Public Cloud." Licentiate thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-15243.
Refaat, Tarek. "Virtual Machine Management for Dynamic Vehicular Clouds." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35864.
Alharthi, Abdulrahman Ayad. "A critical success factors assessment instrument for cloud migration readiness status in Saudi Arabian universities." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/419480/.
Castagnoli, Carlo. "Cloud Computing: gli Hypervisor e la funzionalità di Live Migration nelle Infrastructure as a Service." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/1856/.
Tixier, René. "Mystique et pédagogie dans "The Cloud of unknowing"." Nancy 2, 1988. http://www.theses.fr/1988NAN21013.
The cloud of unknowing is an anonymous 14th-century english mystical and ascetical text belonging to the christian tradition of the letter of spiritual direction. In this text the spiritual director stimulates his "disciple" in his anagogical effort, while teaching him the goal to be reached (man's loving union to god) as well as the means to be used. Meanwhile, the director endeavours to withdraw and leave his disciple in the presence of christ the teacher, thus making it possible for the pedagogical relationship between two men to "work". This withdrawal of the director corresponds to the author's withdrawal from his text -- a text meant to "work" and to make the disciple work. This "law of withdrawal", which is characteristic of mystical writing, will prove to be ruled by love. On the other hand, the use of number of medieval rhetorical techniques (parallelisms, oppositions, accumulations, repetitions, alliterations, etc. ) Will not prevent the author from remaining in a form of fundamental as well as "functional" indetermination which will affect his whole text
Ewelle, Ewelle Richard. "Adapter les communications des jeux dans le cloud." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS145/document.
With the arrival of cloud computing technology, game accessibility and ubiquity havea bright future. Games can be hosted in a centralize server and accessed through theInternet by a thin client on a wide variety of devices with modest capabilities: cloudgaming. Some of the advantages of using cloud computing in game context includes:device ubiquity, computing exibility, affordable cost and lowered set up overheads andcompatibility issues. However, current cloud gaming systems have very strong requirementsin terms of network resources, thus reducing their widespread adoption. In factdevices with little bandwidth and people located in area with limited network capacity,cannot take advantage of these cloud services. In this thesis we present an adaptationtechnique inspired by the level of detail (LoD) approach in 3D graphics. It is based ona cloud gaming paradigm in other to maintain user's quality of experience (QoE) byreducing the impact of poor network parameters (delay, loss, bandwidth) on game interactivity.Our first contribution consist of game models expressing game objects and theircommunications needs represented by their importance in the game. We provided twodifferent ways to manage objects' importance using agents organizations and gameplaycomponents. We then provided a level of detail approach for managing network resourcedistribution based on objects importance in the game scene and network conditions. Weexploited the dynamic objects importance adjustment models presented above to proposeLoD systems adapting to changes during game sessions. The experimental validation ofboth adaptation models showed that the suggested adaptation minimizes the effects oflow and/or unstable network conditions in maintaining game responsiveness and player'sQoE
Liu, Ji. "Gestion multisite de workflows scientifiques dans le cloud." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT260/document.
Large-scale in silico scientific experiments generally contain multiple computational activities to process big data. Scientific Workflows (SWfs) enable scientists to model the data processing activities. Since SWfs deal with large amounts of data, data-intensive SWfs is an important issue. In a data-intensive SWf, the activities are related by data or control dependencies and one activity may consist of multiple tasks to process different parts of experimental data. In order to automatically execute data-intensive SWfs, Scientific Work- flow Management Systems (SWfMSs) can be used to exploit High Performance Computing (HPC) environments provided by a cluster, grid or cloud. In addition, SWfMSs generate provenance data for tracing the execution of SWfs.Since a cloud offers stable services, diverse resources, virtually infinite computing and storage capacity, it becomes an interesting infrastructure for SWf execution. Clouds basically provide three types of services, i.e. Infrastructure-as-a-Service (IaaS), Platform- as-a-Service (PaaS) and Software-as-a-Service (SaaS). SWfMSs can be deployed in the cloud using Virtual Machines (VMs) to execute data-intensive SWfs. With a pay-as-you- go method, the users of clouds do not need to buy physical machines and the maintenance of the machines are ensured by the cloud providers. Nowadays, a cloud is typically made of several sites (or data centers), each with its own resources and data. Since a data- intensive SWf may process distributed data at different sites, the SWf execution should be adapted to multisite clouds while using distributed computing or storage resources.In this thesis, we study the methods to execute data-intensive SWfs in a multisite cloud environment. Some SWfMSs already exist while most of them are designed for computer clusters, grid or single cloud site. In addition, the existing approaches are limited to static computing resources or single site execution. We propose SWf partitioning algorithms and a task scheduling algorithm for SWf execution in a multisite cloud. Our proposed algorithms can significantly reduce the overall SWf execution time in a multisite cloud.In particular, we propose a general solution based on multi-objective scheduling in order to execute SWfs in a multisite cloud. The general solution is composed of a cost model, a VM provisioning algorithm, and an activity scheduling algorithm. The VM provisioning algorithm is based on our proposed cost model to generate VM provisioning plans to execute SWfs at a single cloud site. The activity scheduling algorithm enables SWf execution with the minimum cost, composed of execution time and monetary cost, in a multisite cloud. We made extensive experiments and the results show that our algorithms can reduce considerably the overall cost of the SWf execution in a multisite cloud
Tran, van Paul. "Partage de documents sécurisé dans le Cloud Personnel." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLV015/document.
These past years have witnessed a growing digitalization of our lives, combined with an explosion of personal data quantity on the Internet. This has opened the way to a data-driven market focused on their analysis for profiling purposes, increasingly intrusive and most of the time performed without the user acknowledgement. At the same time, states surveillances are being established, raising concerns about potential dystopias, until now confined in the literature. To tackle this situation, the Personal Cloud paradigm has risen: each user has now the possibility to store and manage all her digital life in a trusted space in which she is the sole responsible.However, this empowerment leads to a governance switch. The user is now in charge of the security and the administration of their data. In particular in the sharing context, where the data is exposed to people or third-parties. Therefore, this thesis proposes a new paradigm in the way the sharing is performed in the Personal Cloud. It focuses on security, control and on a better simplicity of use for the users. Three contributions are made in this direction: (i) a Privacy-by-Design architecture, dedicated for the Personal Cloud context, (ii) a sharing model suited for the Personal Cloud properties and (iii) a sharing protocol implemented in the Cozy platform
Del, Piccolo Valentin. "Isolation réseau dans un environnement Cloud Public/Hybride." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066050/document.
Cloud computing uses infrastructure with a lot of computing and storage resources. There are three types of cloud: Public cloud, Private cloud, and Hybrid cloud. In order to provide a hybrid cloud solution, we used as a base the TRILL protocol which optimizes the use of the data center infrastructure. However, TRILL cannot interconnect data centers as doing so will merge the data centers networks and each data center will lose its independence. Our first contribution is to change this behavior and we develop MLTP which allows to interconnect TRILL or MLTP network without merging them. Another functionality missing from TRILL is network isolation. To fill this lack, in our second proposal we add to MLTP a solution called VNT and we then have a new protocol called MLTP+VNT. In this protocol, each user traffic is isolated from one another. Therefore, MLTP+VNT allows to have a hybrid cloud environment. Nevertheless, it has two shortcomings. The first one is its “single” point of failure. As a matter of fact, MLTP+VNT uses a new type of nodes called Border RBridges which contains inter-data centers routing information. If a Border RBridge fails, then the information it contained is lost. In order to prevent this loss, we implement a method to synchronize the Border RBridges in our third contribution. The second shortcoming is the obligation to use MLTP+VNT in each network to form the hybrid cloud. To lift this limitation, we design and develop, in our fourth contribution, a bridge between a MLTP+VNT network and an OpenFlow network. This way, our solution allows to create a hybrid cloud environment with the MLTP+VNT solution in the public cloud and OpenFlow in the public cloud
Del, Piccolo Valentin. "Isolation réseau dans un environnement Cloud Public/Hybride." Electronic Thesis or Diss., Paris 6, 2017. http://www.theses.fr/2017PA066050.
Cloud computing uses infrastructure with a lot of computing and storage resources. There are three types of cloud: Public cloud, Private cloud, and Hybrid cloud. In order to provide a hybrid cloud solution, we used as a base the TRILL protocol which optimizes the use of the data center infrastructure. However, TRILL cannot interconnect data centers as doing so will merge the data centers networks and each data center will lose its independence. Our first contribution is to change this behavior and we develop MLTP which allows to interconnect TRILL or MLTP network without merging them. Another functionality missing from TRILL is network isolation. To fill this lack, in our second proposal we add to MLTP a solution called VNT and we then have a new protocol called MLTP+VNT. In this protocol, each user traffic is isolated from one another. Therefore, MLTP+VNT allows to have a hybrid cloud environment. Nevertheless, it has two shortcomings. The first one is its “single” point of failure. As a matter of fact, MLTP+VNT uses a new type of nodes called Border RBridges which contains inter-data centers routing information. If a Border RBridge fails, then the information it contained is lost. In order to prevent this loss, we implement a method to synchronize the Border RBridges in our third contribution. The second shortcoming is the obligation to use MLTP+VNT in each network to form the hybrid cloud. To lift this limitation, we design and develop, in our fourth contribution, a bridge between a MLTP+VNT network and an OpenFlow network. This way, our solution allows to create a hybrid cloud environment with the MLTP+VNT solution in the public cloud and OpenFlow in the public cloud
Chaulet, Maxime. "Rôle du cil primaire dans la migration des neuroblastes du courant de migration rostrale." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS191.
The aim of my thesis was to better understand the mechanisms underlying the role of the primary cilium (PC) in neuronal migration. Our study model is the tangential migration in the rostral migratory stream (RMS) in the postnatal and adult mice. Neuroblasts of the CMR show a saltatory migration with pause and nucleokinesis and a stereotyped centrosome movement. In a first study with preliminary results, we compared the migration between postnatal (P10) and young adult (P30) stages by live imaging on acute brain slices, as well as the effect of genetic ablation of the PC at these two ages. We showed that migrations are different between these two stages and that genetic ablation of the PC impaired differentially migration parameters. In a second study, submitted for publication soon, we analysed cAMP dynamics during postnatal migration. We observed a dynamic cAMP hotspot cyclically at the centrosome, at the basis of the PC. We show that ciliary-produced cAMP diffuses to the centrosome, where it activates locally the cAMP-dependent Protein Kinase A (PKA). Genetic ablation of the cilium and knock-down of the ciliary Adenylate Cyclase 3 lead to the hotspot disappearance. They also affect migration with defective centrosome/nucleus coupling leading to altered nucleokinesis, which is recapitulated by PKA genetic delocalization. We thus show that PC and centrosome act as a signalling unit, linked by ciliary cAMP diffusion regulating the rhythmicity of salutatory migration at the centrosome
Elrajeh, Dima, and Marwan Issaks. "Bekymmer och lösningar för att lagra data i moln." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-67248.
The purpose of this technical report is to study the economical, code reusability and the required time for publishing a web application to multiple cloud service providers for achieving better redundancy. The web application will be published to Azure, Amazon cloud, and Google cloud. The thesis covers the most common concerns that companies have adapting cloud computing in their business. The internal and external threats such as data corruption, malicious insider, insecure authentication in APIs, denial of service attacks, data breaches, physical damage to data centers and existing solutions will be discussed in depth to create a better understanding if cloud computing is safe for data storing. The practical project was completed successfully in time and enabled the writers to give an educated description over the obstacles that were faced during the transfer of the web application between different clouds.