期刊:
PACLIC 17: Language, Information and Computation, Proceedings,2003年:235-242
作者机构:
[He, TT; Luo, CR] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
摘要:
In this paper, vector-distance-weighted algorithm and representative-vector-distance algorithm are described and used to implement the process of automatic text classification. Two experiments have been done by means of the algorithms (experiment1 is based on vector-distance-weighted algorithm and experiment2 is based on representative-vector-distance algorithm). Characters are selected as features. The average precision of experiment1 and experiment2 is 80.36% and 69.27%, respectively. Comparing the two experiments, it can be concluded that the efficiency of text classification can be improved by means of vector-distance-weighted algorithm.
摘要:
To guarantee network Quality of Service (QoS), network controllers designed and applied in real networks are necessary. How to automatically find efficient parameters of a controller and get the setting time of control system in simulation is a common problem in the process of controller design. Some definitions, experience rules and algorithms based on statistical theory are proposed in this paper, which are able to get the setting time, judge the stability feature of network control system and compare the control effects of different controllers. We tested the algorithms with network congestion controllers and the experiments results show that they are efficient to network controller evaluation, which enlarge the testing range and facilitate controller design.
摘要:
根据用户所从事的具体工作划分用户群组的方法,归为同一用户群组的各个用户具有相同的角色集,同时由群组取代多名用户接受角色授权,这样多次用户角色授权就被压缩为一次群组角色授权,大大减少了授权工作量.文中设计了"群组图"用于形式化描述用户群组的性质,分析了在进行群组角色授权时应注意的问题,讨论了在RBAC模型中设置的用户群组与访问控制列表ACL(Access Control List)中的用户群组的本质区别.同时应用用户群组完成了中级人民法院办公自动化系统的用户角色授权.
摘要:
The goal of this paper is to research the topology discovery of a computer network algorithms. Sonic key techniques Of backbone topology discovery are discussed in detail, and sonic Solutions are proposed, Such as how to ascertain the link relations of network equipments, how to mark a router, how to avoid a router being accessed repeatedly, and how to distinguish a router from gateway. This paper also analyses the principle of subnet topology discovery and presents a method for discovering the live hosts in a subnet. On these basis, a backbone topology discovery algorithm and a subnet topology discovery algorithm are designed by ourselves. and the complexity of these algorithims are analysed. At last all the algorithms are implemented successfully in object oriented language-JAVA2.
作者机构:
Department of Computer Science, Central China Normal University, Wuhan, 430079, China;Department of Computer Science, Loughborough University, Loughborough, Leicestershire, LE11 3TU, United Kingdom
会议名称:
World Congress
关键词:
computer communication networks;computer simulation;control system analysis;linear control systems;stability analysis
摘要:
The present paper proposes a control-theoretic approach to design rate-based controllers in order to flow-regulate the best-effort traffic through high-speed computer communication networks. Classical control theory and Schur-Cohn stability test are exploited to design the traffic controllers for high-speed networks. The stability of closed-loop congestion controlled systems is analysed by utilizing Schur-Cohn stability criterion, which leads to certain necessary and sufficient stability condition under which the controlled network is asymptotically stable in terms of buffer occupancy. The proposed stability condition is then shown to be a key tool in designing a wide scope of adaptive controllers. Simulations are performed that show good performance of such controlled networks.