安全U盘近年来作为网络安全解决方案中重要的组成部分,承载着用户的重要信息,其可以通过应用协议数据单元(application protocols data units,APDU)与计算机设备通信。该文使用SPI演算对安全U盘与PC间的APDU数据交换协议进行分析显示该...安全U盘近年来作为网络安全解决方案中重要的组成部分,承载着用户的重要信息,其可以通过应用协议数据单元(application protocols data units,APDU)与计算机设备通信。该文使用SPI演算对安全U盘与PC间的APDU数据交换协议进行分析显示该协议存在可被重放攻击的安全缺陷。结合安全U盘的应用模型,提出了基于中间层的安全检测方法。通过该检测方法发现了某信息系统安全U盘存在的安全隐患。展开更多
In this review article, we begin with reviewing Calculus of variations giving few examples on its use to solve a large number of problems in geometry, physics, and other branches of knowledge. Afterwards, we direct ou...In this review article, we begin with reviewing Calculus of variations giving few examples on its use to solve a large number of problems in geometry, physics, and other branches of knowledge. Afterwards, we direct our attention to different methods of variations which evolved during the last century and which include their use in eigenvalue problems and in finite difference methods and those adopted in classical and quantum mechanics. The methods used in evaluating products and quotients of functionals are also discussed along with variational iteration methods. Later on, a good number of applications in different areas are presented and discussed;then a concluding discussion is given.展开更多
In this paper, we apply Malliavin calculus to discuss when the solutions of stochastic differen-tial equations (SDE's) with time-dependent coefficients have smooth density. Under Hormander'scondition,we conclu...In this paper, we apply Malliavin calculus to discuss when the solutions of stochastic differen-tial equations (SDE's) with time-dependent coefficients have smooth density. Under Hormander'scondition,we conclude that the solutions of the SDE's have smooth density. As a consequence,we get the hypoellipticity for inhomogeneous differential operators.展开更多
文摘安全U盘近年来作为网络安全解决方案中重要的组成部分,承载着用户的重要信息,其可以通过应用协议数据单元(application protocols data units,APDU)与计算机设备通信。该文使用SPI演算对安全U盘与PC间的APDU数据交换协议进行分析显示该协议存在可被重放攻击的安全缺陷。结合安全U盘的应用模型,提出了基于中间层的安全检测方法。通过该检测方法发现了某信息系统安全U盘存在的安全隐患。
文摘In this review article, we begin with reviewing Calculus of variations giving few examples on its use to solve a large number of problems in geometry, physics, and other branches of knowledge. Afterwards, we direct our attention to different methods of variations which evolved during the last century and which include their use in eigenvalue problems and in finite difference methods and those adopted in classical and quantum mechanics. The methods used in evaluating products and quotients of functionals are also discussed along with variational iteration methods. Later on, a good number of applications in different areas are presented and discussed;then a concluding discussion is given.
基金The project supported by National Natural Science Foundation of China Crant 18971061
文摘In this paper, we apply Malliavin calculus to discuss when the solutions of stochastic differen-tial equations (SDE's) with time-dependent coefficients have smooth density. Under Hormander'scondition,we conclude that the solutions of the SDE's have smooth density. As a consequence,we get the hypoellipticity for inhomogeneous differential operators.
