Energy-efficient distributed authorisation server (DAS) placement for sensor networks
International Journal of High Performance Computing and Networking
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Distributed embedded software systems, such as sensornetworks and command and control systems, are complexsystems with stringent performance, reliability, security,and safety constraints. These are also long-lived systemsthat must be continually upgraded and evolved to incorporate enhanced functionality. One approach for achievinghigh quality and evolvability for these systems is to organizethem in the form of application-oriented frameworks thatallow the system to be composed from orthogonal aspectsthat can be independently developed, evolved, and certified.In this paper, we define a general framework that allows a distributed embedded system to have relatively independent aspects, including \plug-and-play" capability. Wepresent conditions under which the reliability of the system can be inferred from the reliability of the individualaspects. The approach is illustrated for a framework-baseddistributed sensor network.