WSNs being energy constrained systems, one major problem is to employ the sensor nodes in such a manner so as to ensure maximum coverage and connectivity with minimal or optimal number of nodes and furthermore elongate network lifetime with maximum e

Power consumption is an important design criterion in the design of wireless sensor networks. Hybrid radio frequency/free space optical wireless sensor networks (RF/FSO WSN) have been proposed to reduce the energy consumption of traditional R

比较了短信息在无标度网络、小世界网络和实际的短信息网络三种网络中的传播过程, 寻找影响短信息传播 的因素. 研究发现, 网络拓扑结构和手机用户的转发短信行为均会影响短信息传播过程. 在无标度网络中短信息传 播速率快于小世界网络和实际的短信息网络, 而无标度网络的短信息寿命较小世界网络和实际的短信息网络短 网络中手机用户的转发短信息行为明显影响短信息的传播过程. 同时还发现短信息寿命与网络直径有关.-Compared the short message in the scale-fr

In wireless sensor network，cluster algorithm of nodes is all effective approach and key technology to implement energy saving and flexible management．To improve security and lifetime of clustering network，a secure clustering was pro— posed based on t