配电网线路运行安全管理措施刍议

我们国家随着时代的不断变迁也在快速的提升自身的社会经济,国家电网在当前这一时期面临许多关于用电高需求的问题,这些问题的出现需要加强电网系统的供电能力,同时还应该稳定电网系统,通过这种方式来保证在使用电力资源的过程中用户可以更加安全与方便。在电网系统中一个十分关键的组成部分就是配电网,在整个电网的运行过程中配电网所起到的作用不容忽视。而作为实际的配电网承载着的配电线路来说,其安全运行会严重影响到整个配电网的电力输送。     

10kV配电网线路变配电安装技术和实践问题探索

电力事业在不断的发展,我国对电力事业的要求也在逐渐的升高,国家已经对电网的运行进行了改革,尤其是低电压配电网线路在电网的运行中扮演着重要的角色。10k V配电网是电网运行中十分重要的组成部分,可以满足人们日常的生活需要,但是在安装技术和实践上还需要进一步的探索。本文就是对10kV配电网线路变配电安装技术和实践问题进行分析,为相关的研究提供借鉴。     

基于GIS的电力模拟盘及调度指挥系统

以地理信息系统为基础平台构建配电网信息系统,能有效的提高工作效率,增强对电网设备的运行管理和监管能力,保证电网的安全运行,提高供电可靠性,为现代配电网的规划、管理提供辅助决策.地理信息系统满足了现代电网管理对大区域、实时性、交互性、现实性管理的要求.     

基于神经网络评价的农村电网投资分配决策研究

农村电网是配电网中较为薄弱的一个环节,加之乡村振兴等政策的提出,迫切需要加大对农村电网的投资,提升电压合格率、供电可靠性等问题,但是传统的主观分配方法已经不能满足电网收益率的要求。本文从农村电网设备投资模型出发,通过讨论传统的电网投资分配模型与分配方法,提出了基于BP神经网络评价的新型农村电网投资分配方式,进一步的验证方法的可靠性,并以安顺市县级农村电网为例,讨论所提方法的可行性,对供电企业的农村电网投资提供一定参考意义。     

10 kV配电网的变压器及其配电柜的安装技术

变压器和配电柜是10 kV配电网的重要组成部分,对配电网的安全、高效运行起着重要的作用。通过结合10 kV配电网的实际运行情况,对变压器和配电柜的安装技术进行了分析,希望为今后配电网设备的安装提供一定的参考价值。     

10kV配电网无功补偿配置探讨

随着当前社会经济发展速度的加快,社会工业发展对电力要求提高,也就带来我国电网在运行中无功需求增大。在当前的10kV配电网运行中出现许多电力运行不稳定的情况,带来人们生活、生产上的不便,因此,必须对10kV配电网的无功补偿进行一定的优化设计,保证配电网正常运行。     

关于城市电网配电运行水平与供电能力的探究

近年来,随着我国综合实力的增强,经济水平的飞速提高,我国的城市化进程也得到飞速发展,人们对于城市电网配电运行水平与供电能力的要求也就越来越高。人们对电力设施的高要求就促进了我国电力设施的发展完善,而我们知道配电网是电力设施的核心部分,配电网的安装质量就直接决定了城市电网配电运行的水平与供电的能力,所以配电网的是十分重要的。就此,我们笔者对城市电网配电运行水平与供电能力进行了详细的探究。     

配电网极限线损分析

配电网是现代化城市和农村电网改造过程中的关键部分,近年来,随着经济的快速发展,作为电力系统的核心要点,配电网技术得到不断的改进和提升,从根本上提高了电网的供电质量,解决了供电企业电网质量不足的问题,降低电力设备的容量,创造良好的经济效益。本文将针对配电网极限线损以及线损原因进行分析研究,找出相应的解决办法,减少配电网线损和电能浪费。     

基于遗传算法的有源配电网故障区段定位方法研究

为提高电网故障区段定位的效率,减少算法迭代与收敛行为的发生次数,为终端供电服务提供帮助,引进遗传算法,通过对电网运行产生数据的迭代处理,设计一种针对有源配电网故障区段的全新定位方法.根据有源配电网的常态化运行,进行故障信息采集,使用"1"与"0"描述电网中各个电流节点,根据节点流通的时序输出故障节点,实现对节点的编码;...     

基于电话的配电网运行记录系统的通信设计

本介绍了配电网运行记录系统的通信设计方案。配电网运行记录系统主要用于电网运行数据实时采集和电网运行分析。首先讨论了选择基于电话的远程通信方式的原因，针对此系统，详细讨论了通信结构、协议、冗余措施在内的系统设计。最后介绍了通信的编程实现。     

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.