疑似预防接种异常反应(Adverse Events Following Immunization,AEFI)监测是疫苗警戒研究的主要方式之一,其主要目的是侦测疫苗的安全性信号。由于被动AEFI监测系统存在数据质量不稳定、疫苗接种剂次难以收集等问题,造成传统的以分母为...疑似预防接种异常反应(Adverse Events Following Immunization,AEFI)监测是疫苗警戒研究的主要方式之一,其主要目的是侦测疫苗的安全性信号。由于被动AEFI监测系统存在数据质量不稳定、疫苗接种剂次难以收集等问题,造成传统的以分母为基础的研究方法难以实施。近数十年来,疫苗警戒研究者和统计学家开始利用以分子为基础的数据挖掘技术(Data Mining Algorithms,DMAs)对AEFI监测数据进行安全性信号的侦测。目前疫苗警戒研究中最常见的DMAs方法为比例失衡分析,主要分为传统频数方法和贝叶斯方法,计算的指标主要有比例报告比、报告比值比和相对报告比;以及贝叶斯置信传播神经网络的信息组件和模糊贝叶斯伽马-泊松收缩论的经验贝叶斯几何均数。现对DMAs的基本原理及其应用进行综述。展开更多
Quantum digital signature is the quantum scenario of classical digital signature.It makes use of quantum effects to provide unconditionally secure signature.We first present a prototype of quantum signature scheme usi...Quantum digital signature is the quantum scenario of classical digital signature.It makes use of quantum effects to provide unconditionally secure signature.We first present a prototype of quantum signature scheme using single photons and then discuss its extensions.The most important property of the proposed scheme is that it is not necessary for the scheme to use entangled states.The security of the scheme is based on quantum key distribution and quantum one-time pad proved as unconditionally secure.The present scheme is efficient in that it needs only single photons and von Neumann measurement.We also show a quantum circuit for the scheme.展开更多
Active networks is primarily a Defense Advanced Research Projects Agency(DARPA)-funded project focusing on the research of mechanisms, applications, and operating systems to develop a reconfigurable network infrastruc...Active networks is primarily a Defense Advanced Research Projects Agency(DARPA)-funded project focusing on the research of mechanisms, applications, and operating systems to develop a reconfigurable network infrastructure. This letter proposes an Secure Active Tracing System (SATS) to implementing security for active networking in Internet. Unlike currently existing schemes, SATS reduces the computational overloads by executing the filtering operation on selected packet streams only when needed.展开更多
基金Supported by the National Natural Science Foundation of Chinaunder Grant No.60472032
文摘Quantum digital signature is the quantum scenario of classical digital signature.It makes use of quantum effects to provide unconditionally secure signature.We first present a prototype of quantum signature scheme using single photons and then discuss its extensions.The most important property of the proposed scheme is that it is not necessary for the scheme to use entangled states.The security of the scheme is based on quantum key distribution and quantum one-time pad proved as unconditionally secure.The present scheme is efficient in that it needs only single photons and von Neumann measurement.We also show a quantum circuit for the scheme.
文摘Active networks is primarily a Defense Advanced Research Projects Agency(DARPA)-funded project focusing on the research of mechanisms, applications, and operating systems to develop a reconfigurable network infrastructure. This letter proposes an Secure Active Tracing System (SATS) to implementing security for active networking in Internet. Unlike currently existing schemes, SATS reduces the computational overloads by executing the filtering operation on selected packet streams only when needed.
