Error quantification of the normalised right graph symbol for an errors-in-variables system

This paper proposes a novel method to quantify the error of a nominal normalized right graph symbol (NRGS) for an errors-in-variables (EIV) system corrupted with bounded noise. Following an identification framework for estimation of a perturbation model set, a worst-case v-gap error bound for the estimated nominal NRGS can be first determined from \textit{a priori} and \textit{a posteriori} information on the underlying EIV system. Then, an NRGS perturbation model set can be derived from a close relation between the v-gap metric of two models and ${\rm H}_\infty$-norm of their NRGSs' difference. The obtained NRGS perturbation model set paves the way for robust controller design using an ${\rm H}_\infty$ loop-shaping method because it is a standard form of the well-known NCF (normalized coprime factor) perturbation model set. Finally, a numerical simulation is used to demonstrate the effectiveness of the proposed identification method.     

Stabilization of One‐Dimensional Schrödinger Equation with Variable Coefficient under Delayed Boundary Output Feedback

This article considers stabilization of a one‐dimensional Schrödinger equation with variable coefficient and boundary observation which suffers from an arbitrary given time delay. We design an observer and predictor to stabilize the system. The state is estimated in the time span where the observation is available, and also predicted in the time interval where the observation is not available. It is shown that the estimated state feedback stabilizes the system exponentially. A numerical simulation is presented to illustrate the effect of the stabilizing controller.     

基于EVACNET4的教学楼疏散数值模拟

本文通过对某中学教学楼的火灾危险性进行分析,利用安全疏散模拟软件EVACNET 4对教学楼的安全疏散进行模拟,得出具有实际意义的最优结果.最后,通过模拟对教学楼的安全疏散提出了合理性建议.     

Diffusional mobility for fcc phase of Al–Mg–Zn system and its applications

Diffusional mobility for fcc phase of the Al–Mg and Al–Mg–Zn systems was critically assessed by using the DICTRA software (Diffusion Controlled Transformation). Good agreement was obtained from comprehensive comparisons between the calculated and experimental diffusion coefficients. The developed mobility database enables reasonable prediction of diffusion and solidification behaviours resulting from interdiffusion, such as concentration profile of diffusion couples and solidification curve of the Al–Mg alloys.     

风力机控制策略对功率和转速变化的影响分析

为了掌握风力发电机控制策略对运行过程中风力发电机转速和功率流动的影响,在简要介绍与功率和转速变化有关的风力发电机控制策略的基础上,分析了采用不同控制策略的风力发电机功率产生的特点.重点阐释了风力发电机变桨矩控制方法对风力发电机组的功率流动、叶轮转速变化的影响.得出了不同控制策略下风力发电机功率流动方向、叶轮转速大小和方向的变化,以及叶轮转速变化的依据和限制.     

SoC测试访问机制和测试壳的蚁群联合优化

针对系统级芯片(SoC)测试壳优化和测试访问机制的测试总线划分问题,提出了基于蚁群算法的SoC Wrapper/TAM联合优化方法.构造蚁群算法时首先进行IP核的测试壳优化,用于缩短最长扫描链长度,减少单个IP核的测试时间;在此基础上进行TAM结构的蚁群优化,通过算法迭代逼近测试总线的最优划分,从而缩短SoC测试时间.对ITC2002基准SoC电路进行实验的结果表明,该方法能有效地解决SoC测试优化问题.     

基于混合瑞利分布的三维医学图像分割算法

水平集算法是当前比较重要的分割算法,研究该算法的三维分割技术.提出高斯分布和瑞利分布相结合的方法进行概率密度函数的确定与分析,通过随机极大似然算法(SEM)把瑞利分布引入到水平集三维分割演化模型中.该方法成功应用于多种医学组织的三维分割,提高了分割速度和分割效果,减少了参数的设置.     

基于GMA的教育资源网格监控研究

实现全面资源共享、充分提高资源利用率是教育资源网格的主要研究目标,为了实现该目标,设计了ERGM(educa-tion resource grid monitor)监控模型,它具有采集的信息全面、良好的可扩展性和容错性等优点.通过它可以及时采集资源的状态信息为资源调度系统提供依据,使资源的利用更加合理,很好地满足了教育资源网格监控的需求.     

PSO算法在含一阶导数变分问题中的应用

变分问题是一个研究泛函极值的经典数学问题,寻求变分问题的直接解法具有重要的理论和现实意义.鉴于PSO算法在极值问题中的广泛应用,利用分段Hermite插值.建立了求解含一阶导数的变分问题优化模型,构造出了适应度函数,从而使得PSO算法成功应用到变分问题的求解当中.数值实验结果表明了方法的可行性,同时也拓展了PSO算法的应用领域.     

第三代移动通信三大标准浅析

本文介绍了第三代移动通讯的三大标准及其技术特点。并从技术、商用两个角度做出横向对比分析．阐述了各自的优势与缺欠。