Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-31T22:29:13Z No. of bitstreams: 1 ArthurEmanoelCassioDaSilvaESouza_DISSERT.pdf: 1480067 bytes, checksum: 15c2cf114fae56a6c186a5417cecb57f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-04T19:16:06Z (GMT) No. of bitstreams: 1 ArthurEmanoelCassioDaSilvaESouza_DISSERT.pdf: 1480067 bytes, checksum: 15c2cf114fae56a6c186a5417cecb57f (MD5) / Made available in DSpace on 2016-04-04T19:16:06Z (GMT). No. of bitstreams: 1 ArthurEmanoelCassioDaSilvaESouza_DISSERT.pdf: 1480067 bytes, checksum: 15c2cf114fae56a6c186a5417cecb57f (MD5) Previous issue date: 2015-01-28 / A computa??o em nuvem pode ser definida como um modelo computacional distribu?do atrav?s do qual s?o compartilhados recursos (hardware, armazenamento, plataformas de desenvolvimento e comunica??o) na forma de servi?os pagos e acess?veis com um esfor?o m?nimo de gest?o e intera??o. Um grande benef?cio desse modelo ? possibilitar a utiliza??o de variados provedores (i.e. uma arquitetura multiplataforma) para compor um conjunto de servi?os no intuito de obter uma configura??o ?tima em desempenho e custo. Entretanto, a utiliza??o multiplataforma ? impossibilitada pelo problema de cloud lock-in. O cloud lock-in ? a depend?ncia entre uma aplica??o e uma plataforma de nuvem. Ele ? comumente endere?ado por tr?s estrat?gias: (i) uso de camada intermedi?ria que se interp?e aos consumidores de servi?os de nuvem e o provedor, (ii) uso de interfaces padronizadas para acesso a nuvem, ou ainda (iii) uso de modelos com especifica??es abertas. Este trabalho define uma abordagem para avaliar estas estrat?gias. Tal abordagem foi executada e observou-se que apesar dos avan?os conseguidos por estas estrat?gias, nenhuma delas resolve efetivamente o problema do cloud lock-in. Neste sentido, esse trabalho prop?e o uso de Web Sem?ntica para evitar o cloud lock-in, onde modelos em RDF s?o usados para especificar os recursos de uma nuvem, que s?o gerenciados via consultas SPARQL. Nessa dire??o, esse trabalho: (i) apresenta um modelo avaliativo que quantifica o problema do cloud lock-in, (ii) avalia o cloud lock-in entre tr?s solu??es multi-cloud e tr?s plataformas de nuvem, (iii) prop?e utilizar RDF e SPARQL na ger?ncia de recursos de nuvem, (iv) apresenta o Cloud Query Manager (CQM), um servidor SPARQL que implementa a proposta, e (v) compara tr?s solu??es multi-cloud em rela??o ao CQM quanto ao tempo de resposta e a efetividade na resolu??o do cloud lock-in. / Cloud computing can be defined as a distributed computational model by through resources (hardware, storage, development platforms and communication) are shared, as paid services accessible with minimal management effort and interaction. A great benefit of this model is to enable the use of various providers (e.g a multi-cloud architecture) to compose a set of services in order to obtain an optimal configuration for performance and cost. However, the multi-cloud use is precluded by the problem of cloud lock-in. The cloud lock-in is the dependency between an application and a cloud platform. It is commonly addressed by three strategies: (i) use of intermediate layer that stands to consumers of cloud services and the provider, (ii) use of standardized interfaces to access the cloud, or (iii) use of models with open specifications. This paper outlines an approach to evaluate these strategies. This approach was performed and it was found that despite the advances made by these strategies, none of them actually solves the problem of lock-in cloud. In this sense, this work proposes the use of Semantic Web to avoid cloud lock-in, where RDF models are used to specify the features of a cloud, which are managed by SPARQL queries. In this direction, this work: (i) presents an evaluation model that quantifies the problem of cloud lock-in, (ii) evaluates the cloud lock-in from three multi-cloud solutions and three cloud platforms, (iii) proposes using RDF and SPARQL on management of cloud resources, (iv) presents the cloud Query Manager (CQM), an SPARQL server that implements the proposal, and (v) comparing three multi-cloud solutions in relation to CQM on the response time and the effectiveness in the resolution of cloud lock-in.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-13T19:28:10Z No. of bitstreams: 1 PedroBaesseAlvesPereira_DISSERT.pdf: 1699674 bytes, checksum: f6af93574e41ad6736f18ad1e075daae (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-02-14T18:35:46Z (GMT) No. of bitstreams: 1 PedroBaesseAlvesPereira_DISSERT.pdf: 1699674 bytes, checksum: f6af93574e41ad6736f18ad1e075daae (MD5) / Made available in DSpace on 2017-02-14T18:35:46Z (GMT). No. of bitstreams: 1 PedroBaesseAlvesPereira_DISSERT.pdf: 1699674 bytes, checksum: f6af93574e41ad6736f18ad1e075daae (MD5) Previous issue date: 2016-07-29 / O fornecimento de energia el?trica tem sido considerado um aspecto cr?tico da vida moderna, atuando como papel central no cen?rio econ?mico da maioria dos pa?ses. Com a preocupa??o ambiental, econ?mica e a evolu??o tecnol?gica, a energia e?lica se tornou uma op??o vi?vel de fonte alternativa de energia el?trica. Para a obten??o desse tipo de gera??o el?trica ? necess?ria a constru??o de parques e?licos, que s?o projetos de alta complexidade. Com o intuito de ajudar no processo de edifica??o civil desse tipo de empreendimento, esta pesquisa prop?e um modelo h?brido de planejamento e controle de gerenciamento de projetos para auxiliar a constru??o civil de parques e?licos. A primeira parte da pesquisa foi constitu?da de uma investiga??o de campo preliminar e de estudo da literatura sobre gerenciamento de projetos, energia e?lica e constru??o de parques e?licos. Na segunda etapa, um estudo de caso de constru??o de parque e?lico foi feito, considerado a refer?ncia de constru??o civil para o melhor entendimento do seu processo e de como o gerenciamento de projetos foi usado. Assim, foi proposto um modelo h?brido de planejamento e controle da constru??o civil de parques e?licos que aprimoram a execu??o de projetos, aperfei?oando ?ndices de car?ter financeiro, de satisfa??o do cliente e de compet?ncia em projetos. / The supply of electricity has been considered a critical aspect of the modern life, working as a central role in the economic situation of most countries. The environmental, economic concerns and the technological evolution allowed the consolidation of wind energy as a viable alternative energy source. To produce this type of electricity generation is required the construction of wind farms, which are high complexity projects. This research aims to propose a hybrid management project model of planning and controlling to assist the construction of wind farms by helping the process of building this sort of constructions. The first part of research was a preliminary field investigation and literature study on project management, wind power and construction of wind farms. During the second phase, the case study was performed about the construction of a wind farm, that is considered a reference in civil construction to better understand its process and how the project management was used. With this information, the planning and controlling hybrid model for construction of wind farms was proposed. It aims the improvement of wind projects edification resulting in better financial, customer satisfaction and skill projects aspects.