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Wireless sensor networks are a challenging field of research when it comes to security issues. Using low cost sensor nodes with limited resources makes it difficult for cryptographic algorithms to function without impacting energy consumption and latency. In this paper, we focus on key management issues in multi-hop wireless sensor networks. These networks(More)
Non-blocking algorithms for concurrent data structure guarantee that a data structure is always accessible, in contrast to blocking algorithms in which a slow or halted process can render part or all of the data structure inaccessible to other processes. In this paper, we rst develop a method to design non-blocking algorithms for any concurrent data(More)
Given the diversity of home environment, appliances, and residents, the applications for smart homes must be configurable and adaptive. Instead of programming each household, we propose an ontology-based framework to facilitate the automatic composition of appropriate applications. The system composes appropriate services depending upon the available(More)
Energy constrained complex real-time systems are becoming increasingly important in defense, space, and consumer applications. In this paper, we present a sensible heuristic to address the problem of energy-efficient voltage scheduling of a hard real-time task graph with precedence constraints for a multi-processor environment. We show that consideration of(More)
Scaling down power supply voltage yields a quadratic reduction in dynamic power dissipation and also requires a reduction in clock frequency. In order to meet task deadlines in hard real-time systems, the delay penalty in voltage scaling needs to be carefully considered to achieve low power consumption. In this paper, we focus on dynamic reclaiming of early(More)