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Traditional simulators have deficiencies of scalability, thus they are not so efficient in running simulations with large-scale networks. In this paper, the authors present a new simulator, namely EasiSim, specifically for evaluating sensor networks on a large scale. EasiSim is featured by organizing its core components, including nodes, topology and scenario, in a hierarchically structured approach. The hierarchically structured organization enables nodes to process all the concurrent events in one batch, hence reducing the running time by an order of magnitude. Moreover, they propose a visualization scheme based on a Client/Server model which separates the Graphical User Interface (GUI) from the simulation engine, and therefore the scalability of the simulator will not be decreased by complex GUI.
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