Constructing Virtual Private Network (VPN) over public network infrastructure (Internet) is becoming the foundation of the next generation network service. At present, VPN mainly focuses on the security property, whil...
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Constructing Virtual Private Network (VPN) over public network infrastructure (Internet) is becoming the foundation of the next generation network service. At present, VPN mainly focuses on the security property, while it is lack of consideration of QoS. On the basis of analyzing the Differentiated Services (Diffserv) and IPsec, we put forward a QoS-based IP VPN Architecture Model which is a tri-tier model that is composed of ESN, ISN and VPN node. It combines encrypted channel mechanism of IPsec and the edge-and-core-model of Diffserv. It provides end-to-end QoS while assures security.
There are so many multimedia resources now. But it is difficult to look for any video thing amongthem. MPEG-4 is a major technique used for video coding. In the paper,some methods based on MPEG-4 coding stan-dard for ...
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There are so many multimedia resources now. But it is difficult to look for any video thing amongthem. MPEG-4 is a major technique used for video coding. In the paper,some methods based on MPEG-4 coding stan-dard for video retrival are introduced. The focus is on converting video data to textual data,then video retrival is con-verted to textual retrival. xML technique is involved naturally.
The diversity of security requirements demands that information systems flexibly support policies,and uni-form policy description is important to implement policy-flexible system. This paper brings up new method to de...
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The diversity of security requirements demands that information systems flexibly support policies,and uni-form policy description is important to implement policy-flexible system. This paper brings up new method to descriptpolicies based on trace, which can be applied to many policies used currently. Subsequently this paper refines thismethod in order to be applicable to actual system ,and discusses how to merge multiple policies.
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