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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

H-N2N : uma arquitetura hier?rquica escal?vel para ambientes de realidade mista de grande porte

Burlamaqui, Aquiles Medeiros Filgueira 15 February 2008 (has links)
Made available in DSpace on 2014-12-17T14:54:50Z (GMT). No. of bitstreams: 1 AquilesMFB.pdf: 3240438 bytes, checksum: c9023667168a3f3c3e50872d9f141db6 (MD5) Previous issue date: 2008-02-15 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / In this work, we propose a solution to solve the scalability problem found in collaborative, virtual and mixed reality environments of large scale, that use the hierarchical client-server model. Basically, we use a hierarchy of servers. When the capacity of a server is reached, a new server is created as a sun of the first one, and the system load is distributed between them (father and sun). We propose efficient tools and techniques for solving problems inherent to client-server model, as the definition of clusters of users, distribution and redistribution of users through the servers, and some mixing and filtering operations, that are necessary to reduce flow between servers. The new model was tested, in simulation, emulation and in interactive applications that were implemented. The results of these experimentations show enhancements in the traditional, previous models indicating the usability of the proposed in problems of all-to-all communications. This is the case of interactive games and other applications devoted to Internet (including multi-user environments) and interactive applications of the Brazilian Digital Television System, to be developed by the research group. Keywords: large scale virtual environments, interactive digital tv, distributed / Neste trabalho, propomos uma solu??o para resolver o problema de escalabilidade encontrado nos ambientes virtuais e de realidade mista colaborativos de grande porte, que usam o modelo cliente-servidor hier?rquico. Basicamente, usamos uma hierarquia de servidores. Quando a capacidade de um servidor ? atingida, um novo servidor ? criado subordinado a ele e a carga atual do sistema ? distribu?da entre eles (pai e filho). Propomos ferramentas e t?cnicas eficientes para solucionar problemas inerentes ao modelo cliente-servidor, tais como a defini??o de agrupamentos de usu?rios, a distribui??o e redistribui??o de usu?rios entre servidores e opera??es de mixagem e filtragem, que s?o necess?rias ? redu??o de fluxo de informa??o entre servidores. O novo modelo e t?cnicas propostas foram testados, em simula??o, emula??es e em aplica??es interativas que foram implementadas. Os resultados destas experimenta??es mostram melhorias nos modelos tradicionais anteriores, indicando a usabilidade do framework proposto em problemas de comunica??o todos para todos. Este ? o caso de jogos interativos e outras aplica??es voltadas ? Internet (incluindo ambientes multiusu?rio) e aplica??es interativas do Sistema Brasileiro de Televis?o Digital, a serem desenvolvidas pelo grupo de pesquisa

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