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Data Hiding and Security for XMLDatabase: A TRBAC-Based Approach 认领 引用 被引量：1
1
作者 ZHANGWan-song SUNWei LIUDa-xin 《Wuhan University Journal of Natural Sciences》 EI CAS 2005年第1期293-296,共4页
In order to cope with varying protection granularity levels of XML(extensible Markup Language) documents, we propose a TXAC (Two-level XML. Access Control) framework,in which an extended TRBAC ( Temporal Role-Based Ac... In order to cope with varying protection granularity levels of XML(extensible Markup Language) documents, we propose a TXAC (Two-level XML. Access Control) framework,in which an extended TRBAC ( Temporal Role-Based Access Control) approach is proposed to deal withthe dynamic XML data With different system components, LXAC algorithm evaluates access requestsefficiently by appropriate access control policy in dynamic web environment. The method is aflexible and powerful security system offering amulti-level access control solution. 展开更多
关键词 XML data access control data security
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Reliable routing algorithm in marine ad hoc networks 认领 引用
2
作者 LINWei YANGYong-Tian 《Journal of Marine Science and Application》 2004年第2期46-49,共4页
A routing algorithm called DNH for increasing efficiency of mobile ad hoc network is presented, which is based on a new criterion called TSS ( Temporarily Steady State) , combining with wireless transmission theory th... A routing algorithm called DNH for increasing efficiency of mobile ad hoc network is presented, which is based on a new criterion called TSS ( Temporarily Steady State) , combining with wireless transmission theory that makes networks topology correspondingly stabilization. Also the DNH algorithm has the characteristics of giving up queuing in a node, but selecting another idle node instead of the node for forwarding data packets if the node has a full throughput. Simulation evaluation shows that selecting another node is better than queuing in a full throughout node if some conditions are satisfied, especially during a sea battle, every warship in ad hoc network wants to contest time and increase propagation reliability. The DNH algorithm can help decrease routing time, and raise efficiency of marine ad hoc networks. 展开更多
关键词 船舶 adhoc网络 布线协议 DNH
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Modeling and software implementation of flight system for simulator of a new fighter 认领 引用
3
作者 SUICheng-cheng YANGYong-tian JIARong-zhen 《Journal of Marine Science and Application》 2004年第1期52-56,共5页
Real-time modeling and simulation of flight system are the key parts of simulator. After describing the architecture of simulator for a newer fighter, author presents the composition of flight system and its mathemati... Real-time modeling and simulation of flight system are the key parts of simulator. After describing the architecture of simulator for a newer fighter, author presents the composition of flight system and its mathematic models. In this paper, aircraft is regarded as an elastic flight body. And a new integrated algorithm which can remedy the shortcoming of Euler method and four-element method is used to calculate the Eulerian angles of aircraft. Finally, the software implementation of the flight system is given in the paper. 展开更多
关键词 flight simulator simulation modeling six-DOF mathematical model
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