数据仓库地图化的LMRA模型

本文研究数据仓库地地图化解决方案,利用ＯＬＡＰ技术,提出关系型数据地图化的空间ＬＭＲ模型及其运算。     

三维真实感地图生成

介绍了ＯｐｅｎＧＬ的基本工作机制,并详细论述了利用Ｗｉｎｄｏｗｓ９５＋ＯｐｅｎＧＬ＋ＶＣ＋＋５．０平台开发三维真实感地图的基本原理和过程。实践证明,利用该方法开发三维地图不仅速度快,而且真实感效果好。     

基于神经网络的K－L变换和心电地图数据压缩

Ｋ－Ｌ变换是均方误差准则意义下的最佳交换，是心电地图数据压缩的重要方法．但Ｋ－Ｌ变换的常规算法计算量大，目前又无快速算法，实现困难．本文采用人工神经网络算法来实现Ｋ－Ｌ变换，并将其应用于心电地图的数据压缩，实验结果表明：该网络算法具有设计简单、易于实现以及对数据扰动的稳健性等优点，其压缩效果与Ｋ－Ｌ变换常规算法相当．     

基于OTSU和轮廓追踪的地图线条识别方法

纸质地图或扫描地图是传统地图保存方式。这种方式使得空间查询与分析困难,需要将这些地图矢量化才有助于对历史地理空间数据的查询和分析。然而,传统矢量化方式耗时耗力,不能满足实际需求。为此,提出了一种基于边界追踪的地图自动矢量化方法。首先,将地图灰度化和二值化;然后,对二值化的地图应用栅格转矢量方法矢量化。最后,基于4幅地图,测试了本文方法的提取效果。实验结果表明,本文方法能够较为完整地提取出全部地图的线条,且可以有效地将地图中的文字分离出来。     

基于神经网络的K—L变换和心电地图数据压缩

Ｋ－Ｌ变换是主误差准则意义下的最佳变换，是心电地图数据压缩的重要方法。但ＫＰＬ变换的常规算法计算量大，上前又无快速算法，实现困难。本文采用人工神经网络算法来实现Ｋ－Ｌ变换，并将其应用于心电地图的数据压缩，实验结果表明：该网络法具有设计简单，易于实现以及对数据扰动的稳健性等优点，其压缩效果与Ｋ－Ｌ变换常规算法相当。     

基于二阶优化的地图重构算法

空间数据可视化是信息可视化的重要组成部分,而地图则是空间数据可视化最常用的载体.生成与传统地图相似的简化地图能够提高研究人员与普通民众对空间数据分析和可视查看的效率和准确率.然而传统通过人工绘制得到重构地图的过程十分烦琐,现有算法生成的重构地图大都由矩形形式组成,导致地图结构化信息缺失.这些因素都会影响重构地图的可视化效果.通过数据简化以缩减边界数据量、直角化与去噪声以规范图形边界和消除边界毛刺、二阶优化求解以得到最优布局效果这3个步骤,实现地图重构及可视化的完整流程.文中选择我国部分省份以及美国除夏威夷和阿拉斯加外的地区作为测试样本.对比现有的空间有序正方化布局算法,该算法能更好地维持重构地图与实际地图在区域形状和邻域关系的相似度.     

一种基于预测跟踪技术的地图识别方法

地图是由表示各种地物及其空间关系的大量曲线和符号组成,本文在Freeman码的基础 上,针对地图的具体特点,提出了一种适于地图要素轮廓描述的"预测跟踪"技术,在识别过程 中,充分利用了地图的先验知识,通过学习来抽取地图各要素的分析特征.最后,本文给出以 二值化、大比例尺的地图为实验对象的实验结果.     

构建地图化的政府网站

本文初步探讨了怎样构建地图化的政府网站。内容包括：构建地图化的政府网站的契机、存在的若干问题极其解决方案与总体配置，最后给出了应用本解决方案的一些典型实例。     

一种基于GIS技术的军用电子地图系统设计

将ＧＬＳ技术应用到军事地图领域，给出了军用电子地图（ＭＥＭ）的一种设计方案，分析了军用电子地图的功能，讨论了研究军用电子地图的必要性和可行性     

基于浏览器的矢量数据可视化系统

WEBGIS是网络技术和GIS技术相结合的产物,采用服务器端与客户端相结合的混合构造模式。矢量地图预先渲染当前基于服务器绘制栅格化瓦片地图,然后由浏览器获取与显示。这种方式已无法满足浏览器上矢量地图动态制图、矢量地图无极缩放等功能的需求。针对矢量地图显示控制框架、矢量目标与注记的渲染和符号库及地图符号化进行研究,在HTML5技术的基础上构建基于浏览器的矢量数据可视化的系统原型。对矢量数据绘制和地图交互性关键技术进行验证,满足用户日益增长的RIA（Rich Internet Application）需求。     

Computer experience, learning style, and hypermedia navigation

This study focused on the extent to which prior computer-related experiences predicted linear and nonlinear navigation when using a hypermedia learning environment. Those with more years’ experience at working with computers and those with more authoring experience took more linear steps, whereas those with more data base experience and those with more hypermedia experience took fewer linear steps. Those with more years experience at working with computers, those with more programming experience, and those with more authoring experience had a lower percentage of nonlinear steps than those with more experience in those three areas. Those with more word-processing experience, more spreadsheet experience, and more hypermedia experience had a higher percentage of nonlinear steps than those with less experience in those three areas. Also, those with more hypermedia experience took less time than those with less hypermedia experience. A major implication of the study is that we can predict the extent to which a hypermedia user may engage in a hypermedia environment in a nonlinear way by knowing his or her experience in a variety of computer-related uses.     

Worm wheel mechanism with passive rollers

In this study, we developed new worm wheel mechanisms with passive rollers as their teeth and confirmed useful functions of these worm wheels with passive rollers to transmit power from worm gears with higher energy efficiency than ordinary worm wheels. By using passive rollers as their teeth, the developed worm wheels could realize high-power transmission efficiency with rolling frictional resistance instead of sliding frictional resistance. A worm wheel with conical passive rollers and one with disk-shaped passive rollers was fabricated as prototypes and examined in experiments. Smooth back-drivability of the worm wheels with passive rollers, which is difficult to realize with conventional worm wheels, was also demonstrated in the experiments. These serial experiments revealed that the developed worm wheel mechanism with passive rollers can replace conventional worm wheels with the same number of teeth and module in ordinary power transmission mechanisms with worm gearing and realize higher energy efficiency and smooth back-drivability. These features can be very useful to realize safe and soft actuators for automation systems in a human environment.     

具有动态领导节点的多智能体系统一致性分析

具有领导节点的一致性问题是多智能体协调控制重要研究内容。目前其研究结论主要集中在系统通信拓扑关系固定不变这一前提下,对于系统通信拓扑关系为动态变化时具有领导节点的一致性问题尚未得到完全解决。对系统通信拓扑关系为有向、时变情况下的具有领导节点的多智能体系统一致性问题进行研究。分析并给出了在领导节点为常值和时变两种情况下多智能体系统达到一致的条件。并通过矩阵论和图论相关知识给出了详细证明。最后通过仿真实例验证了结论的正确性。     

电子产品物流服务集成供应链合作利益分配机制研究

从物流服务集成商与功能型物流企业在业务上的合作关系出发,构建电子产品物流服务集成供应链合作利益分配机制,分析合作利益分配机制的运行效果以及影响因素。结果表明,最优分配系数与集成商的物流服务质量产出弹性系数呈负相关,与功能型物流企业的物流服务质量产出弹性系数呈正相关;双方投入的最优物流服务质量与产出系数呈正相关,与成本系数呈负相关;最优固定支付与产出系数呈负相关,与成本系数呈正相关。     

PHP在Web数据库的应用研究

信息社会的到来,使昝ＷＥＢ技术与数据库技术紧密结合起来。该文着重对ＰＨＰ在ＷＥＢ数据库中的开发技术作了分析,并与其它ＷＥＢ数据库开发技术进行了比较,提出取Ｌｉｎｕｘ为系统平台,利用ＰＨＰ与ＭｙＳＱＬ构建民ＷＥＢ数据库系统的方案民,并对其前景作了展望。     

基于宏与全局变量Floyd并行算法的性能对比

在Ubuntu操作系统上,实现多线程并行的Floyd算法。对实验数据分析表明,基于全局变量定义代价矩阵A大小的并行程序所获得的并行性能要优于基于宏参数定义矩阵A大小的并行程序的性能。这与相应的用宏参数定义矩阵A大小的串行程序性能要更优的结果相反。     

Robust optimal control of bilinear DC-DC converters

This paper addresses the control problem of dc-dc converters. The control law synthesis considered here exploits the potential of LMI-based control approaches, which allow to cope with model uncertainty, disturbances and bilinearities to synthesize simple state-feedback controllers with a priori guarantee of stability in a large domain of initial and operating conditions. The aim of the paper is to contribute with a robust control framework to deal with the common requirements of regulated dc-dc converters. The correctness of the results has been verified both with numerical simulations and with experimental measurements from a laboratory prototype.     

How non-zero initial conditions affect the minimality of linear discrete-time systems

From the state-space approach to linear systems, promoted by Kalman, we learned that minimality is equivalent with reachability together with observability. Our past research on optimal reduced-order LQG controller synthesis revealed that if the initial conditions are non-zero, minimality is no longer equivalent with reachability together with observability. In the behavioural approach to linear systems promoted by Willems, that consider systems as exclusion laws, minimality is equivalent with observability. This article describes and explains in detail these apparently fundamental differences. Out of the discussion, the system properties weak reachability or excitability, and the dual property weak observability emerge. Weak reachability is weaker than reachability and becomes identical only if the initial conditions are empty or zero. Weak reachability together with observability is equivalent with minimality. Taking the behavioural systems point of view, minimality becomes equivalent with observability when the linear system is time invariant. This article also reveals the precise influence of a possibly stochastic initial state on the dimension of a minimal realisation. The issues raised in this article become especially apparent if linear time-varying systems (controllers) with time-varying dimensions are considered. Systems with time-varying dimensions play a major role in the realisation theory of computer algorithms. Moreover, they provide minimal realisations with smaller dimensions. Therefore, the results of this article are of practical importance for the minimal realisation of discrete-time (digital) controllers and computer algorithms with non-zero initial conditions. Theoretically, the results of this article generalise the minimality property to linear systems with time-varying dimensions and non-zero initial conditions.     

面向计算机的产品创新设计新模型与新原理(II)

该文基于物元动态系统理论提出了产品虚实模型、产品潜显模型、产品正负模型等产品创新设计模型,分析了产品的同素多构性、一关系多实体性、同构多素性、虚实统一性、一显多潜性、一正多负性等性质。给出在一定的条件下,异构同功,异素同功、同潜产品同功,以及同正产品可互相转化产品、同负产品可互相转化的产品创新设计新原理。新模型和新原理有利于开发计算机辅助产品创新设计系统CAPCDS。     

An Improvement of Response Speed for Electronic Commerce Systems

Now that the number of electronic commerce (hereunder called e-commerce) users has been explosively increasing, the consequent heavy network traffic leads to the delayed service of the e-commerce systems. This paper focuses on operational efficiency and response speed of the e-commerce systems. An e-commerce system, with a hierarchical structure based on the local server, is designed. And we proposed a web object replacement algorithm with heterogeneity of a web object. The algorithm is designed with a divided scope that considered size reference characteristic and reduced size heterogeneity on web object. The performances of the system and algorithm are analyzed with an experiment. With the experiment results, the algorithm is compared with previous replacement algorithms, and we confirm with 10–20% performance improvement of object-hit ratio gain. And we get with 15–30% performance improvement of response speed with proposed system.