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Secure sensor networks has received much attention in the last few years. A sensor network always
works unattended possibly in a hostile environment such as a battlefield. In such environments, sensor networks are subject to node capture. Constrained energy,memory, and computational capabilities of sensor nodes mandate a clever design of security solutions to minimize overhead while maintaining secure communication over the lifespan of the network. In this paper, an authenticated dynamic key management scheme, ADKM has been proposed. It provides efficient, scalable, and survivable dynamic keying in a clustered sensor network with a large number of sensor nodes. ADKM employs a combinatorial exclusion basis system (EBS) for efficiency and one-way hash chains for authentication. Analysis of security and performance demonstrate that ADKM is efficient in security of sensor networks. 相似文献
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轴心轨迹是水电机组状态监测系统中判断机组状态的一个重要特征,为便于直观判断水电机组轴心轨迹的动态运行状况,基于Qt4平台研制了一种动态分析轴心轨迹的软件功能模块。该模块首先对水电机组振摆监测装置记录上送的COMTRADE格式录波文件进行解析,从而获取轴承座上相互正交位置的振动信号录波数据;然后,基于解析获取振动数据,实现了振动信号时域波形展示、轴心轨迹图动态绘制、轴心轨迹特征量指标实时计算等功能。实例分析结果显示,随着振动信号时域波形中分析数据窗的动态移动,轴心轨迹及其相应的特征量可呈现动态变化的效果;同时,在此动态分析过程中,若实时计算的特征量越过预设的动作门槛时,则判断机组轴心轨迹在该时刻发生异常并发出报警信号。由此,将水电机组轴心轨迹分析从传统的静态展示优化为动态展示,便于故障过程的追溯和分析。 相似文献
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