As the number of Virtual Machines(VMs) consolidated on single physical server increases with the rapid advance of server hardware,virtual network turns complex and frangible.Modern Network Security Engines(NSE) are in...As the number of Virtual Machines(VMs) consolidated on single physical server increases with the rapid advance of server hardware,virtual network turns complex and frangible.Modern Network Security Engines(NSE) are introduced to eradicate the intrusions occurring in the virtual network.In this paper,we point out the inadequacy of the present live migration implementation,which hinders itself from providing transparent VM relocation between hypervisors equipped with Network Security Engines(NSE-H).This occurs because the current implementation ignores VM-related Security Context(SC) required by NSEs embedded in NSE-H.We present the CoM,a comprehensive live migration framework,for NSE-H-based virtualization computing environment.We built a prototype system on Xen hypervisors to evaluate our framework,and conduct experiments under various realistic application environments.The results demonstrate that our solution successfully fixes the inadequacy of the present live migration implementation,and the performance overhead is negligible.展开更多
本文针对摄影中出现的小孔衍射现象——'星芒',即以点状光源为中心呈均匀放射状的衍射条纹,采用Matlab软件模拟仿真衍射图样,并通过Matlab与Visual Studio 2013混合编程开发可视化应用程序进行探究。为验证仿真结果的准确性,本...本文针对摄影中出现的小孔衍射现象——'星芒',即以点状光源为中心呈均匀放射状的衍射条纹,采用Matlab软件模拟仿真衍射图样,并通过Matlab与Visual Studio 2013混合编程开发可视化应用程序进行探究。为验证仿真结果的准确性,本文将典型的衍射图样的理论计算值与程序模拟值进行比较,吻合程度较高,初步证明模拟仿真程序具有一定的可靠性。最后,本文利用模拟程序对由多边形孔产生的'星芒'线特征进行了探究,并得到了关于'星芒'线数量与分布特征的初步结论。展开更多
基金supported by State Key Laboratory of Software Development Environment under Grant No. SKLSDE-2009ZX-02China Aviation Science Fund under Grant No.20081951National High Technical Research and Development Program of China (863 Program) under Grant No.2007AA01Z183
文摘As the number of Virtual Machines(VMs) consolidated on single physical server increases with the rapid advance of server hardware,virtual network turns complex and frangible.Modern Network Security Engines(NSE) are introduced to eradicate the intrusions occurring in the virtual network.In this paper,we point out the inadequacy of the present live migration implementation,which hinders itself from providing transparent VM relocation between hypervisors equipped with Network Security Engines(NSE-H).This occurs because the current implementation ignores VM-related Security Context(SC) required by NSEs embedded in NSE-H.We present the CoM,a comprehensive live migration framework,for NSE-H-based virtualization computing environment.We built a prototype system on Xen hypervisors to evaluate our framework,and conduct experiments under various realistic application environments.The results demonstrate that our solution successfully fixes the inadequacy of the present live migration implementation,and the performance overhead is negligible.
文摘本文针对摄影中出现的小孔衍射现象——'星芒',即以点状光源为中心呈均匀放射状的衍射条纹,采用Matlab软件模拟仿真衍射图样,并通过Matlab与Visual Studio 2013混合编程开发可视化应用程序进行探究。为验证仿真结果的准确性,本文将典型的衍射图样的理论计算值与程序模拟值进行比较,吻合程度较高,初步证明模拟仿真程序具有一定的可靠性。最后,本文利用模拟程序对由多边形孔产生的'星芒'线特征进行了探究,并得到了关于'星芒'线数量与分布特征的初步结论。
