一种基于物理隔离的数据库同步方案

电厂的远动数据库有数据量大、更新频率快、准实时的特点。提出了一种在物理隔离环境下内外网远动数据库的数据同步方案。该方案模块划分清晰、通用性好、易于实现,并且不影响内网源数据库和其上的应用系统的正常运行。然后针对SQL Server 2000给出了同步系统实现,经实际运行检验,该方案可行,达到了设计目标。     

基于GPS的SCADA-EMS煤矿供电调度系统的设计

针对SCADA-EMS煤矿供电调度系统存在主站端与远动分站RTU的时间不能同步,从而影响数据采集准确性的问题,提出了一种基于GPS的SCADA-EMS煤矿供电调度系统的设计方案。该系统通过SCADA-EMS实时监测供电系统的运行情况,并可通过客户端进行远程访问;采用GPS与锁相环相结合的方法实现RTU交流数据采样的实时性和准确性。实际应用表明,该系统可有效保证煤矿供电系统的稳定运行。     

基于Web Service的数据库同步系统的设计与实现

WebService技术是一种可以实现分布式应用程序互动共享的重要技术平台。针对当前异构数据库在数据同步过程中出现的一系列问题,本文提出了在WebService技术的基础之上构建数据库同步系统方案的基本思路、设计方法以及实现路径。WebService技术在数据库同步系统方案中的应用不仅仅可以有效解决异构数据库同步的问题,而且可以有效保障应用系统业务的正常运作。     

基于Web Service的异构数据库同步系统设计与实现

针对在分布式网络环境下异构数据库之间数据同步中存在的问题,提出了一种基于WebService技术的异构数据库数据同步系统的解决方案和实现方法。通过在各数据库应用系统中放置基于WebService技术的数据同步客户端程序以及在服务器端部署WebService服务程序实现数据的同步,不但有效地解决了在异构数据库之间数据同步时存在的问题,而且对各需要同步的应用系统的正常业务处理几乎没有影响,对应用系统的改动工作量也很小。最后,把该方案应用到了一个实际项目中。     

空间数据库双向按需同步方案的研究与实现

提出了一种解决非连通网络环境下空间数据库按需同步问题的方案。该方案基于XML作为数据交换标准,使用触发器监控数据变更来进行增量收集,基于Oracle XSU、ArcEngine下Geodatabase开发实现了空间化数据的按需选择同步收集和变更应用服务程序。根据不同的业务需求,本方案通过配置可灵活实现对两个空间数据库中的空间化数据、基本属性数据,及与空间数据库关联的栅格影像进行粒度可控的双向同步复制。结合国家卫星海洋应用中心HY-1B卫星遥感数据地面存档与分发系统的需求,开发实现了空间数据按需同步迁移子系统,验证了该方案的可行性。     

多平台移动数据库系统的自由软件实现

论文讨论了移动计算环境下设计和实现移动数据库系统面临的问题,由此提出了一个基于自由软件、支持多平台和异构、优化的“移动数据库-同步组件-中央数据库”三级结构的设计和实现方案。着重论述了其中的关键技术,如移动数据库的层次封装、同步流程、并发条件下的冲突检测算法、系统组建及优化。依该方案已开发出一个面向应用的测试系统,提供数据部署和同步、冲突处理及系统管理等功能,兼容并扩展了移动数据库应用编程规范。     

分布式微机远动装置

针对国内电力调度系统多采用集中型结构微机远动装置的敝端，提出分布式微机远动装置的方案，详细介绍了该装置的各部分组成和工作原理。     

基于ZigBee通讯技术的移动接触网监控系统

该文提出一种电气化铁路集装箱中心站移动接触网监控系统的实现方法.该方法基于PLC和ZigBee无线通讯技术,采用分层分布的控制方案,实现了对移动接触网控制设备的远端监控,远动通道采用ZigBee无线通讯方式减轻了现场通讯电缆的铺设工作量.该系统为集装箱装却站场的科学管理和全方位远程监控提供了先进的技术手段.该系统已在昆明集装箱中心站成功运行.     

基于数据库导出导入功能的煤矿双机热备系统

针对中小煤矿应用的双机热备需求,提出了一种基于数据库导出导入功能的纯软件形式的煤矿双机热备系统实现方案,详细介绍了系统的同步策略、网络传输及实现流程,并阐述了双机热备的任务切换和上层应用的透明访问等功能及流程。该方案具有效率高、容错性好、部署简单和运行稳定等特点,可满足煤炭行业对双机热备系统的通用技术要求。     

煤矿安全监控系统双机热备软件实现方案

针对煤矿安全监控系统的双机热备问题,提出了一种软件实现方案,即利用SQL Server 2000数据库的触发器拦截数据库更新的数据,采用双机热备软件实现数据双机同步,并通过人机界面与用户交互;针对该方案下可能出现的备机故障、数据库故障以及软件故障,提出了相应的解决方案。应用结果表明,该双机热备软件实现方案效果良好。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.