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中文摘要：
范围问题是在无线传感器网络的设计的基本问题之一，它在传感器网络的表演上有大影响。在这篇文章，范围问题用一个数学模型被调查命名出生死亡过程。在这个模型，当网络并且从网络停止传感器节点的再生被看作网络的死亡，在时间的每个时期加入进网络的传感器节点被考虑。最后，一个分析答案被用来调查适当的率满足范围要求。
英文摘要：
Coverage problem is one of the fundamental issues in the design of wireless sensor network, which has a great impact on the performance of sensor network. In this article, coverage problem was investigated using a mathematical model named Birth-death process. In this model, sensor nodes joining into networks at every period of time is considered as the rebirth of network and the quitting of sensor nodes from the networks is considered as the death of the network. In the end, an analytical solution is used to investigate the appropriate rate to meet the coverage requirement.
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