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This PhD thesis presents investigations, models and implementations of a computational grid middleware named Grid Anywhere. This platform aims at allowing the build of computational grid systems, which enable the increa se of the number of participants as consumers and resource providers. In order to do th is, new solutions are presented to manage security policies, load applications, host o bjects, execute remote methods, develop application and alternative transport of SO AP messages in a flexible way (using the interactive digital television system and inser ting one SOAP message inside another document of this same protocol). As applications of this middleware, two different architectures of computational grids were created. The first one enables an environment to share resources that are used as infrastructure to provide platform as a service (PaaS) in a cloud computing system. The goal of the secon d architecture is to increase the computational power of desktop computational grid s ystems using digital television receivers (set-top box) as resource providers, wher e the distribution of objects and SOAP messages occurs via broadcasting. The models w ere validated by means of real tests using the respective implementations, which s howed that the platform is functional. Such implementations provide software p oducts that help the innovation and development of computational grid applications a d also others types of distributed systems.

Grid Anywhere: Um middleware extensível para grades computacionais desktop