Amitava Datta

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FlexiTP is a novel TDMA protocol that offers a synchronized and loose slot structure. Nodes in the network can build, modify, or extend their scheduled number of slots during execution, based on their local information. Nodes wake up for their scheduled slots; otherwise, they switch into power-saving sleep mode. This flexible schedule allows FlexiTP to be(More)
We consider the problem of a robot which has to find a path in an unknown simple polygon from one point <italic>s</italic> to another point <italic>t</italic>, based only on what it has seen so far. A <italic>Street</italic> is a polygon for which the two boundary chains from <italic>s</italic> to <italic>t</italic> are mutually weakly visible, and the set(More)
Ad hoc networks, due to their improvised nature, are frequently established in insecure environments and hence become susceptible to attacks. These attacks are launched by participating malicious nodes against different network services. Routing protocols, which act as the binding force in these networks, are a common target of these nodes. A number of(More)
IV. Network Management Systems 5 A. Sensor Network Management Framework 5 1. BOSS 5 2. MANNA 6 B. Sensor Network Management Protocols 8 1. RRP 8 2. SNMS 9 3. sNMP 10 4. WinMS 11 C. Management By Delegation 12 1. Agilla 12 2. Mobile Agent-Based Policy Management 12 3. Sectoral Sweeper 12 4. Intelligent Agent-Based Power Management 13 D. Debugging Tools 13 1.(More)
The class of multi-pass iterative thinning algorithms is considered. A new algorithm in the same class is proposed and is shown, on the basis of experimental results, to be superior to the existing ones with respect to medial axis representation and robustness. Some basic properties of thinning like 1 pixel thickness, preservation of connectivity for the(More)
We present a user interface, based on parallel coordinates, that facilitates exploration of volume data. By explicitly representing the visualization parameter space, the interface provides an overview of rendering options and enables users to easily explore different parameters. Rendered images are stored in an integrated history bar that facilitates(More)
RNA pseudoknots are functional structure elements with key roles in viral and cellular processes. Prediction of a pseudoknotted minimum free energy structure is an NP-complete problem. Practical algorithms for RNA structure prediction including restricted classes of pseudoknots suffer from high runtime and poor accuracy for longer sequences. A heuristic(More)
SUMMARY Multiple sequence alignment is the NP-hard problem of aligning three or more DNA or amino acid sequences in an optimal way so as to match as many characters as possible from the set of sequences. The popular sequence alignment program ClustalW uses the classical method of approximating a sequence alignment, by first computing a distance matrix and(More)
One important problem in target advertising and viral marketing on online social networking sites is the efficient identification of communities with common interests in large social networks. Existing methods involve large scale community detection on the entire social network before determining the interests of individuals within these communities. This(More)