【作者】 罗自强； 李华莹； 李德毅；

【Author】 Ziqiang Luo , Huaying Li, Deyi Li ( PLA University of Science and Technology, Nanjing 210007, China) ( Institute of Electronic System Engineering, Beijing 100039, China)

【机构】 中国人民解放军理工大学； 中国电子系统工程研究所；

【摘要】 无线传感器网络作为信息科学领域的一个全新的前沿方向,已经引起了学术界和工业界的广泛关注。传感器网络研究最早源于2001年美国陆军提出的“灵巧传感器网络通信”计划。通过飞机撒播、特种炮弹发射等手段,可以将大量便宜的传感器密集地部署于己方人员不便于到达的观察区域,如敌方阵地内,以收集到有价值的数据;特别地,在一部分传感器因为可靠性、遭破坏等原因失效时,传感器网络作为整体仍可能完成侦察任务。更多还原

【Abstract】 The academe and industries pay much attention to wireless sensor networks which is a bran-new front direction. The research of sensor networks comes of the plan of "smart sensor networks communications" which has been brought forward by America’s army in 2001. A great deal of cheap sensors may be deployed thickly by plane or shell to collect useful data in surveillance regions where cannot be arrived convenience, such as enemy position. Specially, sensor networks still can accomplish surveillance missions in despite of some sensors’ failure due to reliability or being wrecked. Reliability is a basic attributes of sensor networks, which is also an important index to scale networks’ performance. In general, reliability is an ability of a system to perform its functions in routine. Connectivity is only a necessary condition that sensor networks run up to snuff. Due to the uncertainty factors such as nodes failure, fluctuation of information streams, and route strategies, from theory models to analysis approach, the research of network reliability is very difficult. Reliability is a qualitative concept whose extension is obscure. It is unreasonable to judge strictly and distinctly whether the systems’ states are failure or not based on bivalent logic or multi-valued logic with vague or imprecise information. This doesn’t accord with human thinking character and commonly viewpoint of objective things. Sample points are endowed with determinate degree to unified depict the randomness and fuzziness of systems’ states and it’s reliability. Then we can present a novel approach to reflect uncertainty essence of reliability. The radar picture of system performances for assessment of reliability, invulnerability anti-counter measurement of C3I systems has been developed by Academician Li De-yi, based on cloud model. The unified assessment is operational by using test bed technology as well. Song Yuan-jun solved the cloud reliability evaluation problems of electronic products or computers. Based on finite Markov chains theory, we present cloud reliability models using different types of sensors and spares when failed. This paper brings forward the concepts of cloud sets and cloud numbers, presents particularly the operation arithmetic among cloud numbers. Then we construct a Markov model for network reliability based on cloud numbers which reflect the failures’ uncertainties.更多还原