基于“三网融合”的可视化资源协同

网络的宽带化发展有效促进了可视化资源的使用,特别是"三网融合",推动了应用协作和资源共享的发展,在三网间共享资源,实现整个社会信息资源的重复利用和深度挖掘,必将给社会带来巨大的经济效益和社会效益.因此,探索在"三网"间进行可视化资源协同、信息共享是社会信息化发展的重要内容.     

离散傅里叶变换误差分析与参数设置

离散傅里叶变换( Discrete Fourier Transform,DFT) 是数字信号处理教学的重点和难点,其参数设置的正确与否直接影响信号频谱分析的准确性。本文对连续与离散周期信号、非周期信号分别进行DFT运算,从時域和频域角度分析实际频谱与理想频谱之间的误差。通过MATLAB仿真,加深学生对DFT的理解,引导学生正确设置DFT参数。     

LED电视在2D模式下的视觉健康舒适度测试研究

通过客观量测人眼观视时的各项视觉生理指标,并将各项指标嵌入人眼健康舒适度评价模型进行分析运算。经由583人次的人因实验,从视觉健康舒适度、电视屏幕人眼色觉客观量化反馈以及操控可用性3个方面对12款主流品牌的LED电视样机的视觉健康舒适度与人机交互设计进行了测试与评价。     

用Visual Basic开发个性化图形界面的技术及其实现

Visual Bhsic(VB)是开发Windows环境下图形化应用程序的良好工具，其易学易用已为广大编程爱好者公认。可是VB开发的图形界面中规中矩，已不能满足日益张显个性的要求，就此本文以时钟程序为例，介绍如何用VB开发具有通明效果的不规则图形界面应用程序的关键技术。     

An experimental study on the universality of visual vocabularies

Bag-of-visual-words has been shown to be a powerful image representation and attained success in many computer vision and pattern recognition applications. Usually for a given classification task, researchers choose to build a specific visual vocabulary, and the problem of building a universal visual vocabulary is rarely addressed. In this paper we conduct extensive classification experiments with three features on four image datasets and show that the visual vocabularies built from different datasets can be exchanged without apparent performance loss. Furthermore, we investigate the correlation between the visual vocabularies built from different datasets and find that they are nearly identical, which explains why they are universal across classification tasks. We believe that this work reveals what is behind the universality of visual vocabularies and narrows the gap between bag-of-visual-words and bag-of-words in text domain.     

断路器弹簧机构现场安装调试常见故障的处理方法

弹簧操动机构是断路器的核心元件,对电力系统的安全性有直接影响.本文对断路器弹簧机构的安装调试过程中常见故障进行分析,并且对故障解决方法进行探讨,旨在提高电力系统运行的安全性.     

基于四阶偏微分方程的图像去噪方法实现

针对VB数值计算能力和图像处理能力不足,以及不利于系统开发的缺点,介绍基于VB和MatrixVB并利用四阶偏微分方程实现图像去噪的方法。利用VB作为主要编程语言,借助MatrixVB矩阵运算函数库建立了处理系统,实现了图像去噪功能。该方法将Matlab的强大计算功能与VB的Windows用户界面开发方面的优势结合起来,缩短了软件的开发周期。软件测试结果表明．计算方法正确,方法稳定可靠,算法设计优化,所开发的应用软件具有界面友好,计算速度快,系统资源消耗少,操作简便易行,能满足图像滤波的要求。     

Multivariate Polynomial Minimization and Its Application in Signal Processing

We make a conjecture that the number of isolated local minimum points of a 2n-degree or (2n+1)-degree r-variable polynomial is not greater than n ^r when n 2. We show that this conjecture is the minimal estimate, and is true in several cases. In particular, we show that a cubic polynomial of r variables may have at most one local minimum point though it may have 2^r critical points. We then study the global minimization problem of an even-degree multivariate polynomial whose leading order coefficient tensor is positive definite. We call such a multivariate polynomial a normal multivariate polynomial. By giving a one-variable polynomial majored below a normal multivariate polynomial, we show the existence of a global minimum of a normal multivariate polynomial, and give an upper bound of the norm of the global minimum and a lower bound of the global minimization value. We show that the quartic multivariate polynomial arising from broad-band antenna array signal processing, is a normal polynomial, and give a computable upper bound of the norm of the global minimum and a computable lower bound of the global minimization value of this normal quartic multivariate polynomial. We give some sufficient and necessary conditions for an even order tensor to be positive definite. Several challenging questions remain open.     

BS体系网络结构计算机软件开发的研究

B/S架构管理软件更加方便、快捷、高效,文章基于这一背景,分析了BS体系结构软件开发的相关技术,包括其应用的PHP技术、Visual Basic技术以及SQL标准语言等方面。     

基于VS 2008的Demo测试软件设计

Demo测试软件是基于Visual Studio 2008工具开发出的一个单文档界面程序。其主要的功能是生成一个将要在高速公路显示屏上显示的信息播放列表文件,该播放列表文件中要包含播放屏数、每屏停留时间、屏幕上显示字体的方式、速度、在屏幕上显示初始字体的位置、字体的大小、颜色以及字体间距,该功能通过“添加”、“删除”、“发送”、“列表”、“保存”5个按钮实现。