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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Uma abordagem na camada de middleware para troca din?mica de componentes em sistemas multim?dia distribu?dos baseados no framework Cosmos

Vieira Junior, Ivanilson Fran?a 20 March 2009 (has links)
Made available in DSpace on 2014-12-17T15:47:50Z (GMT). No. of bitstreams: 1 IvanilsonFVJ.pdf: 1175067 bytes, checksum: 36d08791e1658b3543761ec05cd15028 (MD5) Previous issue date: 2009-03-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / To manage the complexity associated with the management of multimedia distributed systems, a solution must incorporate concepts of middleware in order to hide specific hardware and operating systems aspects. Applications in these systems can be implemented in different types of platforms, and the components of these systems must interact each with the other. Because of the variability of the state of the platforms implementation, a flexible approach should allow dynamic substitution of components in order to ensure the level of QoS of the running application . In this context, this work presents an approach in the layer of middleware that we are proposing for supporting dynamic substitution of components in the context the Cosmos framework , starting with the choice of target component, rising taking the decision, which, among components candidates will be chosen and concluding with the process defined for the exchange. The approach was defined considering the Cosmos QoS model and how it deals with dynamic reconfiguration / Para tratar a complexidade associada ao gerenciamento dos sistemas multim?dia distribu?dos, uma solu??o deve incorporar conceitos de middleware de forma a abstrair especificidades de hardware e sistemas operacionais. Aplica??es nesses sistemas podem ser executadas em diferentes tipos de plataformas, e os componentes destes sistemas precisam interagir uns com os outros. Devido ? variabilidade dos estados das plataforma de execu??o, uma abordagem flex?vel deve permitir a troca din?mica de componentes visando garantir o n?vel de QoS da aplica??o em execu??o. Neste contexto, o presente trabalho apresenta uma abordagem na camada de middleware para a realiza??o de troca din?mica de componentes no contexto do framework Cosmos, iniciando com a escolha do componente alvo para a troca, passando pela tomada de decis?o de qual, entre os componentes candidatos, ser? escolhido e concluindo com o processo definido para a troca. A abordagem foi definida com base nos requisitos de QoS considerados no framework Cosmos de maneira a suportar a reconfigura??o din?mica de componentes

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