一种关注消息时效性的机会社会网络中节点传播能力分析模型  

An Analytical Model for Ranking the Candidates of Disseminating Time-Bound Messages in Opportunistic Mobile Social Networks

作　　者：蔡青松[1,2] 刘燕[3] 牛建伟[4] 孙利民[2] 

机构地区：[1]北京工商大学计算机与信息工程学院,北京100048 [2]中国科学院信息工程研究所物联网信息安全技术北京市重点实验室,北京100093 [3]北京大学软件与微电子学院,北京102600 [4]北京航空航天大学计算机学院,北京100191

出　　处：《电子学报》2015年第9期1705-1713,共9页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61170296,No.61373091,No.61190125);国家863计划(No.2012AA050804);北京市教委科技计划(No.KM201110011004);北京工商大学国有资产管理协同创新中心项目(No.GZ20131102)

摘　　要：当前评估节点传播能力的工作大多针对静态网络.本文采用演化图模型对机会社会网络进行刻画,通过将传统通路(walk)的概念和静态图中的Katz中心性度量扩展到动态网络中,提出了一种基于历史相遇记录评估节点消息分发能力的方法.进一步,针对消息的时效性特性,本文提出了消息随时间推移效用递减的节点传播能力分析模型,该模型考虑了消息所有可能经历的空间和时间通路,并沿时间方向向下加权以描述消息时效性递减效应,可用于有效计算和预测节点的消息转发能力.本文的结论通过真实数据得到了验证.Traditional methods for evaluating node importance in sustaining the overall network topology or information dis-semination are widely studied,while most of them are not applicable to dynamic settings where connections among nodes change frequently over time.This paper treats an opportunistic mobile social network as a time evolved,dynamic graph and proposes an ef-fective scheme to calculate the relative nodal dissemination capability based on the contact history.In particular,we analyze the node importance in forwarding messages in more general settings where messages are time-dependent and become less important or out of date over time.To this end,we take a dynamic walk counting approach to calculate all possible temporal-spatial routes from a node to any other node by using a method of down-weighting of length.Since the age of a message increases with time,the old walks are discounted to represent the fading influence on the destination nodes.Experiments are conducted based on 4 real-world trace datasets,and the results show that our analytical result is effective at ranking the capabilities of nodes in disseminating or receiving the time-dependent messages.

关 键 词：机会社会网络 Katz 中心性 动态通路 社会相遇记录 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]