基于电力设备采购质量提升的供应商选择与管理

设备质量是电网安全稳定的物质基础,提高电网装备水平,推动电网装备迈向中高端,持之以恒提升电网本质安全水平,是当前和今后一个时期工作的重中之重,而只有把好电网设备入网质量关,即从采购质量入手,才能从本质上提高设备质量。近年来,国网公司在招标前开展供应商资质能力核实,通过对供应商的资质、业绩等信息及现场实际生产情况核实确认,初步掌握了潜在供应商是否具备生产合格产品的资质和能力。但仍存在设备运行期间发生重大故障等情况。因此,为有效防控和杜绝产品技术风险,推动现有电力企业由规模扩张型向质量效益型转变,强化电网全过程质量管控,从源头入手提高设备质量,建立基于PSO-ELM的供应商选择机制,推动电网设备向中高端迈进、提升电网本质安全与可靠水平。     

提升电网继电保护可靠性的因素分析及管理对策

随着武安电网结构日益复杂,对继电保护可靠性的要求也越来越高。通过对历年来武安电网继电保护事故进行分析研究,总结出了影响电网继电保护可靠性的各种因素及实例,并制定相应的管理对策,提高继电保护运行可靠性从而提高整个电网的安全水平。     

HSD系列变电站微机监控系统

随着国民经济的发展,我国电力系统规模不断扩大。为了实现电网的安全经济运行,提高供电质量, 必须努力提高电网的自动化水平,而计算机的应用,使电网自动化技术得到了迅速发展,使电力系统许多     

SSL在构建安全智能电网中的研究和应用

随着社会工业化和信息技术的不断发展,电力行业进入了智能电网时代.智能电网的信息安全主要包括物理安全、网络安全、数据安全及备份恢复等方面.重点研究其中的网络传输和数据安全,并设计出一套基于SSL通信协议和数字签名机制的通信模式,从而提高智能电网的安全防护能力.     

基于故障仿真的电网安全预防策略

依据电网安全稳定运行标准，结合安全预防3E原则，采用FTA事故树分析、人工智能技术和基于HLA（高层体系结构）的分布交互式仿真技术相结合的方法，研究开发区域电网故障仿真系统，利用该系统对电网安全运行管理的相关技术人员进行反复的故障仿真技术培训，不断提高技术人员对事故的判断、处理故障的能力，积累处理各种类型异常和故障的经验，从而可以预防电网安全事故的发生。     

变电运行中安全生产风险管理体系的应用和相关问题探析

随着经济的快速发展和科技的不断进步,电力资源已经成为社会生产和发展中必不可少的资源之一。在电力系统的运行过程中必须保证电网的安全,只有这样,才能为电力企业的稳定发展提供保障。在变电运行过程中应用安全生产风险管理体系能有效提高电网系统的安全性和可靠性,从而提高电力系统的供电质量。     

电压质量在线监测装置的探讨

控制电网的无功功率，提高电网的运动水平及电网的供电质量一直是电力系统比较棘手的问题，为解决这个问题国内陆续出现了一些用监测电网电压运动水平的仪器，但均未达到预期的效果，我们研制出的电压质量在线监测装置具有智能化、精度高和抗干扰性强的特点，可以实时监测、打印记录。     

变电运行中的常见问题及防治方法

变电运行作为电网安全运行的基本保障,其运行质量的好坏对于整个电网系统的运行效率有着关键性的影响,更是人们日常生活用电的重要保障。但是,就我国当前变电运行现状来看,其中仍旧存在了很多的弊端,由于变电运行人员专业能力水平较差,缺乏一定的安全管理意识,导致变电运行过程中发生了许多的运行故障,不仅严重影响了电网的正常运行,甚至还引起了重大的安全事故,极大的威胁了人们的生命财产安全,破坏了社会的和谐安定。因此,为了更好的解决这一问题,笔者就具体对变电运行中常见的故障问题进行了研究讨论,从而总结出了一些有效的防治对策。     

电网基建施工现场注意事项及改善

电网基建工程的安全建设,促进了电力企业的持续发展,既有助于降低电量的损耗,同时又能够有效的保证供电的安全性,从而有助于电力企业实现经济效益最大化。由于在电网基建的施工过程会受到众多因素的影响,因此,加强对电网基建施工现场的注意事项及改善工作显得尤为重要。本文通过对电网基建施工现场的注意事项进行分析,并提出了其改善的措施,从而有效提高电网基建工程的建设质量。     

基于大数据的电网设备供应商管理评价方法

质量过硬、价格合理的电网设备直接关系到电力系统安全稳定运行，而供应商是其中的关键环节。文章将大数据理念和方法应用到电网设备供应商管理评价领域中，构建了基于大数据的供应商管理评价模型框架，重点从电力设备产品属性和供应商属性2个维度提取31项供应商分类指标体系，将主观赋值法和层次分析法相结合，从而实现对不同供应商的科学评价和分类。基于应用实例的试验结果表明，所提方法能够为电力企业采购部门制定采购方案，完善供应商管理提供有力支撑。     

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.