上下文感知服务器中基于预测的负载均衡算法

在上下文感知服务器中,需要收集大量的上下文信息并对其进行处理。必须通过服务器集群并采用负载均衡技术才能保证服务器的正常运行。该文提出基于预测负载进行自适应负载均衡的算法,采用支持向量机预测系统运行下一个阶段的负载量,结合当前系统各节点处理情况进行动态负载分配过程,在任务执行过程中,不进行任务的迁移以减少迁移所带来的系统消耗。通过比较表明,在负载变化较大的情况下,算法能够有效地提高服务器性能。     

基于线性变换的计算与数据动态分解方法

在并行优化编译器的并行识别过程中,许多串行代码无法找到全局一致的分解结果,数据重分布无可避免,有必要寻找一种有效的方法求解计算和数据的动态分解。该文研究了单个嵌套循环计算与数据分解算法以及分解结果表示方法,提出一种在多个嵌套循环间求解数据线性一致分布的动态分解算法,结合程序的结构分析和程序的控制流信息,用于通用串行代码的并行分解过程,可以同时给出串行代码的计算划分和数据分布结果。     

基于交互的Agent行为选择动态性分析

在动态不可预知环境下,Agent行为选择过程表现出动态性。该文基于人工生命和MAS框架,建立Agent行为选择动态系统模型,运用动态系统观点研究Agent感知、认知交互和适应,分析Agent行为选择适应外部环境和满足内部需求的动态平衡过程。在仿真试验中,通过21个Agent局部感知和交互,实现了全局平衡、稳定的群体运动行为。     

Real-time reliability prediction for dynamic systems with both deteriorating and unreliable components

As an important technology for predictive maintenance, failure prognosis has attracted more and more attentions in recent years. Real-time reliability prediction is one effective solution to failure prognosis. Considering a dynamic system that is composed of normal, deteriorating and unreliable components, this paper proposes an integrated approach to perform real-time reliability prediction for such a class of systems. For a deteriorating component, the degradation is modeled by a time-varying fault process which is a linear or approximately linear function of time. The behavior of an unreliable component is described by a random variable which has two possible values corresponding to the operating and malfunction conditions of this component. The whole proposed approach contains three algorithms. A modified interacting multiple model particle filter is adopted to estimate the dynamic system’s state variables and the unmeasurable time-varying fault. An exponential smoothing algorithm named the Holt’s method is used to predict the fault process. In the end, the system’s reliability is predicted in real time by use of the Monte Carlo strategy. The proposed approach can effectively predict the impending failure of a dynamic system, which is verified by computer simulations based on a three-vessel water tank system.     

认知无线电中动态频谱分配问题的研究

介绍了认知无线电的研究现状,对认知无线电系统中已有的动态频谱分配模型进行了分析并结合各种算法进行了比较。在此基础上总结并提出了频谱共享的一些挑战性问题,探讨了动态频谱分配的一些热点问题并构想了未来的发展方向。     

基于UML可适应的教学考评系统分析与设计

该文给出了UML的概念与要点,应用UML对教学考评系统进行了建模。给出了系统的用例模型、整体结构模型、静态模型、动态模型,并分析了模型对教学考评变化的可适应性。     

基于全文检索的Segmenter分词算法改进

流行的Segmenter分词算法是开放的java源代码,它是一个很好的分词工具。但是,在全文检索系统中对分词有特殊的要求,例如歧义包客、专业词典等。所以在这里将Segmenter词典和算法都进行了改选,建立了树状词典,在匹配算法中使用了歧义包容法则、分支处理、动态规划和词库预载入。以适应电子商务案例全文检索系统。     

Controllability of multi-agent systems based on agreement protocols

This paper investigates the controllability of multi-agent systems based on agreement protocols. First, for a group of single-integrator agents, the controllability is studied in a unified framework for both networks with leader-following structure and networks with undirected graph. Some new necessary/sufficient conditions for the controllability of networks of single-integrator agents are established. Second, we prove that, under the same topology and same prescribed leaders, a network of high-order dynamic agents is completely controllable if and only if so is a network of single-integrator agents. Third, how the selection of leaders and the coupling weights of graphs affect the controllability is analyzed. Finally, some numerical simulations are presented to demonstrate the effectiveness of the theoretical results.     

基于EMS系统的低频减载实时计算的实现

目前电网调度生产中尚不能实现低频减载的在线实时监测,调度无法及时掌握低频减载控制负荷,给电网的安全稳定运行造成一定的安全隐患。为解决该问题,在EMS系统中开发了基于设备的动态拓扑功能,利用广度优先算法将末端设备的负荷动态拓扑到需统计的单位母线上,从而实时显示每条母线8轮低频减载值,再利用E语言文件将计算好的值传给上一级单位进行更高电压等级母线的实时统计。     

计算方法管理器的研究与实现

针对发电设备制造行业的产品设计过程中关于多个计算方法联合执行和参数映射的需求,对计算方法管理器进行研究：在分析工程计算方法的运行原理和计算文件格式的基础上,根据行号和列号从计算文件中解析参数,进而建立参数之间的映射关系,实现计算文件之间的参数值传递,同时利用动态载入的脚本程序,描述计算文件中的逻辑规则：设计并开发出基于J2EE框架,关系数据库和动态脚本等技术的计算方法管理器系统,并且在产品设计分析环境（PADE）系统下执行实际算例,验证其有效性