846 resultados para cloud
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One of the major problems when using non-dedicated volunteer resources in adistributed network is the high volatility of these hosts since they can go offlineor become unavailable at any time without control. Furthermore, the use ofvolunteer resources implies some security issues due to the fact that they aregenerally anonymous entities which we know nothing about. So, how to trustin someone we do not know?.Over the last years an important number of reputation-based trust solutionshave been designed to evaluate the participants' behavior in a system.However, most of these solutions are addressed to P2P and ad-hoc mobilenetworks that may not fit well with other kinds of distributed systems thatcould take advantage of volunteer resources as recent cloud computinginfrastructures.In this paper we propose a first approach to design an anonymous reputationmechanism for CoDeS [1], a middleware for building fogs where deployingservices using volunteer resources. The participants are reputation clients(RC), a reputation authority (RA) and a certification authority (CA). Users needa valid public key certificate from the CA to register to the RA and obtain thedata needed to participate into the system, as now an opaque identifier thatwe call here pseudonym and an initial reputation value that users provide toother users when interacting together. The mechanism prevents not only themanipulation of the provided reputation values but also any disclosure of theusers' identities to any other users or authorities so the anonymity isguaranteed.
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Référence bibliographique : Rol, 55042
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Référence bibliographique : Rol, 55043
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Référence bibliographique : Rol, 55039
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Référence bibliographique : Rol, 55038
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Référence bibliographique : Rol, 55037
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Référence bibliographique : Rol, 55036
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Référence bibliographique : Rol, 55040
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Cloud computing and its three facets (Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS)) are terms that denote new developments in the software industry. In particular, PaaS solutions, also referred to as cloud platforms, are changing the way software is being produced, distributed, consumed, and priced. Software vendors have started considering cloud platforms as a strategic option but are battling to redefine their offerings to embrace PaaS. In contrast to SaaS and IaaS, PaaS allows for value co-creation with partners to develop complementary components and applications. It thus requires multisided business models that bring together two or more distinct customer segments. Understanding how to design PaaS business models to establish a flourishing ecosystem is crucial for software vendors. This doctoral thesis aims to address this issue in three interrelated research parts. First, based on case study research, the thesis provides a deeper understanding of current PaaS business models and their evolution. Second, it analyses and simulates consumers' preferences regarding PaaS business models, using a conjoint approach to find out what determines the choice of cloud platforms. Finally, building on the previous research outcomes, the third part introduces a design theory for the emerging class of PaaS business models, which is grounded on an extensive action design research study with a large European software vendor. Understanding PaaS business models from a market as well as a consumer perspective will, together with the design theory, inform and guide decision makers in their business model innovation plans. It also closes gaps in the research related to PaaS business model design and more generally related to platform business models.
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Référence bibliographique : Rol, 55035
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Référence bibliographique : Rol, 55044
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La profunda transformación que está experimentando el periodismo, y la mitosis mediática entre el periodismo tradicional y el digital, está generando, amén de cambios en los contenidos y los géneros periodísticos, una mutación en las formas tecnológicas de publicar esos contenidos y de acceder de forma distribuida, escalable y flexible a nuevas fuentes gracias a Internet: es lo que denominamos cloud journalism. La Sociedad de la Banda Ancha ofrece un abanico de posibilidades que los profesionales del periodismo pueden aprovechar para rentabilizar más su producción y para mejorar su calidad. El grid journalism, el utility journalism o el Journalism as a Service (JaaS), en una dinámica de ASP (Application Service Provider), son otros nuevos conceptos que adaptan el funcionamiento tecnológico de los entornos grid al ámbito de la comunicación y del periodismo.
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El propòsit d'aquest TFC és investigar i fer una instal·lació des de zero d'un model de negoci basat en l'allotjament web fent servir tecnologies de Cloud Computing. El software open-source que es farà servir per aquesta finalitat serà Openstack el qual es basa en un model de servei com infraestructura (IaaS). La nostra finalitat és poder implementar el model IaaS basat en Openstack. Per duu a terme aquest desplegament es farà servir dos hipervisors (KVM i VMware ESXi) per tal de testejar diferents sistemes d¿hipervisors treballant conjuntament.
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Référence bibliographique : Rol, 56941
