命名数据网(named data networking,NDN)作为一种新型的互联网架构,旨在应对日益增长的数据流量。基于其消费者驱动的内容检索模型,NDN自然地支持消费者移动性。然而生产者移动性仍然是一个具有挑战性的问题,需要额外的机制来提高生产...命名数据网(named data networking,NDN)作为一种新型的互联网架构,旨在应对日益增长的数据流量。基于其消费者驱动的内容检索模型,NDN自然地支持消费者移动性。然而生产者移动性仍然是一个具有挑战性的问题,需要额外的机制来提高生产者移动期间的数据可用性。针对该问题,提出一种可扩展的移动管理机制来支持生产者移动性。该机制利用网络终端在基于名称的NDN转发平面上建立了临时转发路径,并设计了缓存与重传机制支持时延容忍和时延敏感的应用数据流。最后在ndnSIM中建立了一个全面的仿真环境,对所提方案与现有解决方案进行了评估和比较。仿真结果表明,该机制能够充分支持生产者移动性。当速度为30 m/s时,丢包率仅为3.0%,平均传输延时为352.1 ms。此外,支持生产者移动性所需的额外消耗对于方案相比降低了49.18%。展开更多
基于随机化的数据扰乱及重构技术是数据挖掘中的隐私保护(Privacy-Preserving Data Mining,PPDM)领域中最重要的方法之一。但是,随机化难以消除由于属性变量本身相关性引起的数据泄漏。介绍了一种利用主成分分析(Principal Component An...基于随机化的数据扰乱及重构技术是数据挖掘中的隐私保护(Privacy-Preserving Data Mining,PPDM)领域中最重要的方法之一。但是,随机化难以消除由于属性变量本身相关性引起的数据泄漏。介绍了一种利用主成分分析(Principal Component Anal-ysis,PCA)进行属性精简的增强随机化方法,降低了参与数据挖掘的属性数据间相关性,更好地保护了隐私数据。展开更多
Nowadays, the major part and most standard networks usually used in several applications are Wireless Sensor Networks (WSNs). It consists of different nodes which communicate each other for data transmission. There is...Nowadays, the major part and most standard networks usually used in several applications are Wireless Sensor Networks (WSNs). It consists of different nodes which communicate each other for data transmission. There is no access point to control the nodes in the network. This makes the network to undergo severe attacks from both passive and active devices. Due to this attack, the network undergoes downgrade performance. To overcome these attacks, security based routing protocol is proposed with the security based wormhole detection scheme. This scheme comprises of two phases. In this approach, the detection of wormhole attacks is deployed for having correct balance between safe route and stability. Also, to ensure packets integrity cryptographic scheme is used as well as authenticity while travelling from source to destination nodes. By extensive simulation, the proposed scheme achieves enhanced performance of packet delivery ratio, end to end delay, throughput and overhead than the existing schemes.展开更多
文摘命名数据网(named data networking,NDN)作为一种新型的互联网架构,旨在应对日益增长的数据流量。基于其消费者驱动的内容检索模型,NDN自然地支持消费者移动性。然而生产者移动性仍然是一个具有挑战性的问题,需要额外的机制来提高生产者移动期间的数据可用性。针对该问题,提出一种可扩展的移动管理机制来支持生产者移动性。该机制利用网络终端在基于名称的NDN转发平面上建立了临时转发路径,并设计了缓存与重传机制支持时延容忍和时延敏感的应用数据流。最后在ndnSIM中建立了一个全面的仿真环境,对所提方案与现有解决方案进行了评估和比较。仿真结果表明,该机制能够充分支持生产者移动性。当速度为30 m/s时,丢包率仅为3.0%,平均传输延时为352.1 ms。此外,支持生产者移动性所需的额外消耗对于方案相比降低了49.18%。
文摘基于随机化的数据扰乱及重构技术是数据挖掘中的隐私保护(Privacy-Preserving Data Mining,PPDM)领域中最重要的方法之一。但是,随机化难以消除由于属性变量本身相关性引起的数据泄漏。介绍了一种利用主成分分析(Principal Component Anal-ysis,PCA)进行属性精简的增强随机化方法,降低了参与数据挖掘的属性数据间相关性,更好地保护了隐私数据。
文摘Nowadays, the major part and most standard networks usually used in several applications are Wireless Sensor Networks (WSNs). It consists of different nodes which communicate each other for data transmission. There is no access point to control the nodes in the network. This makes the network to undergo severe attacks from both passive and active devices. Due to this attack, the network undergoes downgrade performance. To overcome these attacks, security based routing protocol is proposed with the security based wormhole detection scheme. This scheme comprises of two phases. In this approach, the detection of wormhole attacks is deployed for having correct balance between safe route and stability. Also, to ensure packets integrity cryptographic scheme is used as well as authenticity while travelling from source to destination nodes. By extensive simulation, the proposed scheme achieves enhanced performance of packet delivery ratio, end to end delay, throughput and overhead than the existing schemes.
