应用型本科院校离散数学课程建设

介绍应用型本科院校离散数学课程建设的过程。从课程建设的目标、教学内容、教学方式方法、考试机制和网络教学环境等方面阐述离散数学课程的建设情况,重点介绍多种行之有效的教学方法。     

Restrictive mechanism of flow control among non-cooperative Internet users

The flow and congestion control methods based on one-shot game model with non-cooperative game theory can explain the non-cooperative behavior of Internet users.However,the low effciency of equilibrium solutions affects their utility.Here the behavior of flow and congestion control based on infinitely repeated game models is addressed;the repeated and infinitely repeated flow and congestion control game model is presented; the existence and optimization of the Nash equilibrium point are proved;the discount ...     

基于免疫赦免机制的智能分布式入侵检测系统

入侵检测系统是在网络系统遭受攻击之前进行拦截和响应的一种积极主动的安全防护系统。分布式智能入侵检测系统DIIDS(Distributed Intelligent Intrusion Detection System)就是在分布式环境中将人工智能技术应用于入侵检测中,从而可以提高IDS(Intrusion Detection System)的检测的实时性、准确性和容错性。本文设计了一种基于免疫赦免机制的DIIDS。该方法以降低入侵检测系统的时延性与提高入侵检测系统的智能性、恢复能力为核心,改善入侵检测系统的实时性。为实现用户信息的安全转移和检测系统自身的免疫进化,构建了一种免疫赦免智能Agent植入机制(IPAT),从而提高了系统的可用性。     

Two new control signal approaches for obtaining the MRAS-CDM and a real-time application

The coefficient diagram method (CDM) is one of the most effective control design methods. It creates control systems that are very stable and robust with responses without the overshoot and small settling time. Furthermore, all control parameters of the control systems are changed by varying some adjustment parameters in CDM depending on the demands. The model reference adaptive systems (MRAS) are the systems that follow and change the control parameters according to a given model reference system. There are several methods to combine the CDM with MRAS. One of these is to use the MRAS parameters as a gain of the CDM parameters. Another is to directly use the CDM parameters as the MRAS parameters. In the industrial applications, the system parameters can be changed frequently, but if the controller, by self-tuning, recalculates and develops its own parameters continuously, the system becomes more robust. Also, if the poles of the controlled systems approach the jw axis, the response of the closed-loop MRAS becomes more and more insufficient. In order to obtain better results, CDM is combined with a self-tuning model reference adaptive system. Systems controlled by a model reference adaptive controller give responses with small or without overshoot, have small settling times, and are more robust. Thus, in this paper, a hybrid combination of MRAS and CDM is developed and two different control structures of the control signal are investigated. The two methods are compared with MRAS and applied to real-time process control systems.     

P2P网络中Free-rider的平衡机制

针对P2P网络中出现的free-rider现象,提出一种控制点位于服务提供节点上的平衡机制。该机制充分考虑P2P网络拓扑结构不一致的问题,并允许一定数量的free-rider节点存在。实验证明,该机制既能有效利用网络资源,提高交易的成功率,又能对严重的free-rider行为进行抑制。     

基于信任机制的网格资源调度算法

针对目前网格资源调度中忽视信任机制的缺陷,在行为信任模型和能力信任评估的基础上,提出一种信任驱动的资源调度算法TDS。该算法同时兼顾了性能QoS和信任QoS。仿真实验结果表明,TDS算法与传统的基于性能QoS的算法和基于信任QoS的算法相比,在最小完工时间和服务请求提交成功率方面具有较好的性能。     

基于信任机制与遗传算法的渲染网格作业调度研究

信任关系是网格作业调度中一个很重要的因素,也是影响网格计算有效性和性能的关键技术之一。将信任机制引入到渲染网格作业调度中,建立渲染网格环境中基于信任机制的作业调度模型,在调度策略上对基本遗传算法进行了改进,提出了基于信任机制的遗传算法。实验结果表明,该算法可以提高任务完成率和平均信任效益,是适用于渲染网格的一种有效作业调度方法。     

基于P2P的视频会议系统节点选择机制的改进研究

随着P2P技术迅速发展,主要基于P2P技术的视频会议系统作为P2P技术的重要应用之一,且系统的节点选择机制则成为该领域的一个研究热点.利用P2P技术的核心思想构建视频会议系统网络结构,并通过改进系统Chord网络的路由机制来达到改进系统节点选择机制的目的.     

适于高维空间搜索的自组织学习算法

提出了一种有别于当前优化算法框架的自组织学习算法(self-organizing learning algorithm,SLA),该算法融合遗传算法并行搜索与模拟退火串行搜索,结合粒子群学习机制和禁忌搜索机制,实现了系统与环境的交互学习,能够很好地处理传统优化方无法应对的高维非线性优化问题.SLA分自学习和互学习两个智能化学习阶段,先进行基于自学习机制的邻域禁忌搜索,保证局部极值的收敛,然后通过信息共享平台,进行基于互学习机制的广域禁忌搜索,保证全局极值的收敛.系统通过与环境交互学习而自适应地调整搜索策略和相关参数,使得搜索过程能够有效地避免盲目性,而具有相当的自组织性.最后,通过高维测试函数的对比仿真实验表明,SLA在由小型低维空间转入超大型高维空间时,仍能够与环境保持稳定,透明的交互学习,其全局搜索能力和整体稳健性明显优于其它搜索方法.     

基于WSDL-S的轻量级语义Web服务匹配模型

针对现有大多数基于语义的Web服务发现方法实施难度大,实用性不强的问题,提出了一种基于WSDL-S描述的轻量级语义Web服务匹配模型.该模型最大的特点是只需用户输入简单的服务查询字符串就能自动实现Web服务的匹配和调用.服务匹配经过领域本体匹配和基于WordNet词典的同义词匹配两个步骤,特别是领域本体匹配过程中的学习模块能有效提高系统性能.实验结果表明,该系统性能提高在20%到82%之间.