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Active database systems use situation-action rules to define which action has to be taken when a particular situation occurs. Situation diagrams, which are introduced in this paper, provide a high-level graphical representation of situations for the conceptual design of active object-oriented databases. A situation is specified declaratively as a graphical query with temporal and logical conditions...
We analyze a new wormhole routing scheme, which we call the wormhole deflection with virtual channels (abbreviated WDVC) scheme, that combines wormhole routing with virtual channels and deflection routing to provide efficient lossless communication. We use new analytical models to analyze the performance of the WDVC scheme for the Manhattan Street (MS) network topology. In particular, we examine the...
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