XML在网络教学上的应用

XML在网络应用中起着越来越重要的作用。本文介绍了网络教学中最常用的两种XML应用：MathML和SVG，它们分别用来在网页中显示公式和图形；并重点介绍如何将这两种重要的XML应用正确地嵌入网页中，以便在通用的网络浏览器中显示公式和图形。     

Stability and dissipative analysis for a class of stochastic system with time-delay

This paper deals with the stability and dissipative problem of a class of stochastic hybrid system. The system under study involves Markovian jump, impulsive effects and time delay, which are often encountered in practice and are the sources of instability. Our attention is focused on analysis of whether the stochastic hybrid system with time-delay is stochastically asymptotically stable and strictly (Q, S, R) dissipative. By introducing an extra artificial time instance, the equivalent system is obtained and the sufficient conditions are derived by using linear matrix inequality (LMI) techniques. The main results of this paper unify the existing results on H_∞ control.     

Mixed control of uncertain jumping time-delay systems

In this paper, we investigate a class of linear continuous-time systems with Markovian jump parameters. An integral part of the system dynamics is a delayed state with time-varying and bounded delays. The jumping parameters are modeled as a continuous-time, discrete-state Markov process. Employing norm-bounded parametric uncertainties and utilizing the second-method of Lyapunov, we examine the problem of designing a mixed MathML source" title="View the MathML source" align="absbottom" border="0" height=17 width="62"/> controller which minimizes a quadratic MathML source" title="View the MathML source" align="absbottom" border="0" height=14 width="25"/> performance measure while satisfying a prescribed MathML source" title="View the MathML source" align="absbottom" border="0" height=14 width="30"/>-norm bound on the closed-loop system. It is established that sufficient conditions for the existence of the mixed MathML source" title="View the MathML source" align="absbottom" border="0" height=17 width="62"/> controller and the associated performance upper bound could be cast in the form of linear matrix inequalities.     

基于HTML5的视频字幕控制和数学在线互动平台的实现

针对网络平台中存在的视频控制问题,给出基于IE、HTML5和WebVTT的字幕添加和字幕精准控制视频播放位置的方法。针对平台输入与显示数学公式的不理想问题,给出基于MathML和MathType的网页数学公式显示、输入与实时预览的实现途径。     

Theoretical and experimental study of through-wall microwave tomography inverse problems

We consider the problem of building structure estimation using microwave ray tomography. A Bayesian formulation is developed, and a Markov chain Monte Carlo (MCMC) procedure is used to sample the posterior distribution, which is based on a data likelihood defined in terms of a residual misfit between observed and predicted waveforms. To accelerate model optimization, a simulated annealing approach is combined with the MCMC, using specific model moves to explore each component of the model space. Our approach is applicable to data acquired in the frequency or time domain and for monostatic or bistatic acquisition modes. Experimental data for a multi-wall laboratory test structure were acquired using a horn antenna connected to a vector network analyzer and used to validate both the forward model and the inversion approach. Although, in true remote sensing problems for building structure, the model order is usually unknown, in this initial study, the actual inversion experiment is performed in a reduced-dimension model space for which a subset of the variables are taken as known or fixed. Generalization to the variable-dimension problem can be achieved by using reversible jump MCMC sampling procedures.     

支持数学语义描述的在线公式编辑器实践

针对目前网上处理数学公式多采用图片或需安装插件的弊端,提出了一种在线数学公式编辑器实现方案——E-Math。该方案面向主流的MSIE用户,以Content MathML作为描述语言,使用JavaScript和XSLT技术实现,表达了公式的数学含义,支持符号计算、数值计算等新型Web应用。此外,E-Math代码开源并且有良好的扩展性。本文介绍了E-Math的主要功能、框架结构和实现方案。     

支持数学语义描述的在线公式编辑器实践

针对目前网上处理数学公式多采用图片或需安装插件的弊端,提出了一种在线数学公式编辑器实现方案——E-Math。该方案面向主流的MSIE用户,以Content MathML作为描述语言,使用JavaScript和XSLT技术实现,表达了公式的数学含义,支持符号计算、数值计算等新型Web应用。此外,E-Math代码开源并且有良好的扩展性。本文介绍了E-Math的主要功能、框架结构和实现方案。     

基于Web的数学公式数学图形研究

目前在Web环境下输入、显示、编辑、存储、计算和传输数学公式和数学图形非常困难。本文提出并设计了一个基于XHTML＋MathML＋SVG结构的可视化编辑器、采用Mathematica实现Web计算并结合JavaAPPIet技术来解决Web中的数学信息问题。实现在Web方式下对数学公式数学图形的在线操作和在线计算。     

WebEQ插件相关技术综述

MathML是一个基于XML、用于交换数学信息的基本标准。WebEQ插件是一个在浏览器中显示MathML的常见插件。本文介绍WebEQ插件相关技术(如WebEQ插件的基本知识、WebEQ Viewer Control API和WebEQ MathML DOM API)。