Sibrabrata Ray

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We propose a systematic framework for placing a given number of clusterheads in a hierarchical wireless sensor network to facilitate location detection service. The problem of location detection is posed as a hypothesis testing problem over a discretized space. Then, the clusterheads are placed in locations that maximize the worst case Chernoff distance(More)
In many practical applications of sensor networks, the level of sensor coverage needed at different locations varies with time. Pre-computation of sensor deployment in such cases is inadequate; on-the-fly redistribution of nodes in the network, as the system evolves, becomes necessary. Reallocation of sensors consumes resources (e.g., energy). Thus it is(More)
The ARINC-653 standard, dictating the use of time and space partitioning in real-time avionics systems, has been widely embraced by the industry. We present the design of real-time file system (RTFS), a file system that complies with the ARINC-653 standard and the emerging standard for a file system for ARINC-653. RTFS provides realtime accesses to data(More)
The power of ubiquitous computing lies not just in constant access, but also in tailoring of information based upon location. In this paper we describe an architecture that supports tailoring of information and applications for their environment. This environment includes the mobile client device, its location, the available bandwidth, and any soft(More)
Scientific grids are often characterized by an infrastructure made up of high speed and reliable networks that connect heterogeneous and distributed compute and storage devices. This is in stark contrast to the concept behind the global information grid (GIG). The GIG is an interconnected information transfer infrastructure meant to provide seamless(More)
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