Ad hoc移动网络是一种完全由移动主机构成的网络 .网络拓扑易变 ,带宽、能源有限是 ad hoc移动网络的主要特点 .针对这些特点 ,目前设计的 ad hoc路由协议大多采用按需查找方式 .该文介绍了这方面研究的最新进展 ,对几种典型的按需路由...
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Ad hoc移动网络是一种完全由移动主机构成的网络 .网络拓扑易变 ,带宽、能源有限是 ad hoc移动网络的主要特点 .针对这些特点 ,目前设计的 ad hoc路由协议大多采用按需查找方式 .该文介绍了这方面研究的最新进展 ,对几种典型的按需路由协议进行了说明、分析和综合比较 .文中分析了目前协议存在的一些问题并提出了相应的改进方法 .最后指出了下一步研究方向 .
The manner of permission management in Role-Based Access Control is similar to the actual one in application fields, and it greatly simplifies system management. How to define and manage hundreds of permissions, roles...
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The manner of permission management in Role-Based Access Control is similar to the actual one in application fields, and it greatly simplifies system management. How to define and manage hundreds of permissions, roles,users and relations among them ( all are called RBAC special framework in this article)in large systems is one key problem that models for RBAC must resolve. This article studies the management of RBAC special frameworks, takes the management relations among roles into frameworks, and puts forward Management-Enhanced Model for RBAC. Special frameworks created according to this model are very similar to the management structures in application fields, and can manage themselves. This model also supports dynamic maintenance of management formwork while it is working.
With the development of computer network, Biometrics, as a kind of information security techniques, is thought more and more of. Handwritten signature verification is an effective one. This paper introduces the design...
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With the development of computer network, Biometrics, as a kind of information security techniques, is thought more and more of. Handwritten signature verification is an effective one. This paper introduces the design and implementation of an on-line handwritten signature verification system which is based on dynamic programming matching algorithm and give a brief evaluation of its performance. The performance of the system is satisfying according to the experiment.
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