多方隐私保护下的记录链接(privacy-preserving record linkage,简称PPRL)是在隐私保护下,从多个数据源中找出代表现实世界中同一实体的过程.该过程除了最终匹配结果被数据源之间共享外,其他信息均未被泄露.随着数据量的日益增大和现实...多方隐私保护下的记录链接(privacy-preserving record linkage,简称PPRL)是在隐私保护下,从多个数据源中找出代表现实世界中同一实体的过程.该过程除了最终匹配结果被数据源之间共享外,其他信息均未被泄露.随着数据量的日益增大和现实世界数据质量问题的存在(如拼写错误、顺序颠倒等),多方PPRL方法的可扩展性和容错性面临挑战.目前,已有的大部分多方PPRL方法都是精确匹配方法,不具有容错性.还有少部分多方PPRL近似方法具有容错性,但在处理存在质量问题的数据时,由于容错性差和时间代价过大,并不能有效地找出数据源间的共同实体.因此,提出一种结合布隆过滤、安全合计、动态阈值、检查机制和改进的Dice相似度函数的多方PPRL近似方法.首先,利用布隆过滤将各数据源中的每条记录信息转换成由0和1组成的位数组.然后,计算每个对应位置bit 1所占的比率,并利用动态阈值和检查机制来判定匹配成功的位置.最后,通过改进的Dice相似度函数计算出记录间的相似度,进而判断记录间是否匹配成功.实验结果表明:所提出的方法具有较好的可扩展性,并且在保证查准率的同时,比已有的多方近似PPRL方法具有更高的容错性.展开更多
The deflection routing protocol is an effective contention resolution in Optical Burst Switching network, However, it can worsen loss performance of non-deflected burst on the deflection route. To improve the burst lo...The deflection routing protocol is an effective contention resolution in Optical Burst Switching network, However, it can worsen loss performance of non-deflected burst on the deflection route. To improve the burst loss performance, a limited deflection routing scheme based on burst loss threshold is proposed to prevent injudicious deflection routing. By using threshold check function, it restrainedly allows the deflected burst to preemptive network resource, consequently, improve the QoS performance of non-deflected burst. Simulation results show that the scheme can efficiently prevent deflected burst contending with non-deflected burst on deflection route, and effectively improve the burst loss performance of entire networks.展开更多
文摘多方隐私保护下的记录链接(privacy-preserving record linkage,简称PPRL)是在隐私保护下,从多个数据源中找出代表现实世界中同一实体的过程.该过程除了最终匹配结果被数据源之间共享外,其他信息均未被泄露.随着数据量的日益增大和现实世界数据质量问题的存在(如拼写错误、顺序颠倒等),多方PPRL方法的可扩展性和容错性面临挑战.目前,已有的大部分多方PPRL方法都是精确匹配方法,不具有容错性.还有少部分多方PPRL近似方法具有容错性,但在处理存在质量问题的数据时,由于容错性差和时间代价过大,并不能有效地找出数据源间的共同实体.因此,提出一种结合布隆过滤、安全合计、动态阈值、检查机制和改进的Dice相似度函数的多方PPRL近似方法.首先,利用布隆过滤将各数据源中的每条记录信息转换成由0和1组成的位数组.然后,计算每个对应位置bit 1所占的比率,并利用动态阈值和检查机制来判定匹配成功的位置.最后,通过改进的Dice相似度函数计算出记录间的相似度,进而判断记录间是否匹配成功.实验结果表明:所提出的方法具有较好的可扩展性,并且在保证查准率的同时,比已有的多方近似PPRL方法具有更高的容错性.
基金This workis supported by project of National Science Foundation of China (No.90304004) , National"863"Project Plan (No.2005AA122310) , Keyproject of Science and Technology of National Education Department (No.204125) , project of Science Foundation of Chongqing Science and Technology Commission(No.2005BB2062) , Youth Science and Technology Grant of CQUPT(No.A2005-28) .
文摘The deflection routing protocol is an effective contention resolution in Optical Burst Switching network, However, it can worsen loss performance of non-deflected burst on the deflection route. To improve the burst loss performance, a limited deflection routing scheme based on burst loss threshold is proposed to prevent injudicious deflection routing. By using threshold check function, it restrainedly allows the deflected burst to preemptive network resource, consequently, improve the QoS performance of non-deflected burst. Simulation results show that the scheme can efficiently prevent deflected burst contending with non-deflected burst on deflection route, and effectively improve the burst loss performance of entire networks.
