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Specific to the heterogeneity of wireless sensor network, this paper studies the deployment method of heterogeneous WSN based on energy-balance in terms of the heterogeneous networks encompassing two types of nodes with different energy level. In detail, this paper established the network lifetime maximum model based upon energy heterogeneous nodes ratio and managed to solve the deployment proportion...
In China, IPO underpricing phenomena attracts more and more attentions. This paper constructs a structural system of equations and uses the instrumental-variables method to analyze IPO underpricing of the full-circulating stocks. Our empirical findings that those IPO underpricing and initial turnovers are negatively correlated support the hypothesis of speculative bubbles. The IPO underpricing is...
Node localization is one of the basic problems in wireless sensor networks, the RSSI measurement is widely applied in node localization. The error of RSSI measurement will affect the nodes localization's precision. The distance geometry constrain has been applied to reduce the error of RSSI measurement, and combined with triangle and centroid location algorithm. Simulation results show that the positioning...
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