基于同塔多回路输电线路带电检修探讨

在当前新形势下,同塔多回路输电线路的应用越来越多,而其带电检修工作也日益重要,成了考虑的重点。首先对其安全条件做了阐述,然后从直线塔、耐张塔和绳索化作业几方面进行了分析。     

架空输电线路电动平衡走线车研究

近年来,我国电力事业的高速发展,使输电电压不断提高,在对超高压以及特高压进行输电时,线路阻抗以及电晕放电的出现会严重影响输电质量,因此通常需要采用多分裂导线的方式来架设输电线路,不过,这种架设方式很容易造成分裂导线发生磨损、散股等问题,而这便需要作业人员通过走线的方式进行检修,不过目前所采用的走线检修方式不仅普及使用率较低,而且存在着种种的弊端,因此有必要研究一种架空走线类工器具来进行相应的改进。为此,本文便提出一种能够适用于架空输电线路检修的电动平衡走线车,以期能为我国电力事业的发展起到助力作用。     

关于输电线路状态运行检修的探讨

随着社会经济的快速发展,电力逐渐成为人们生活中不可获取的组成部分,相对应的输电线的运行要求也在逐渐提高。为了有效提升输电线路的运行管理,加强对其运行检修已经刻不容缓。本文阐述了输电线路状态运行检修的重要性,对检修主要内容和方式进行了分析,并提出提升输电线路状态运行检修效率的实施策略。     

蚁群算法在输电线路检修计划中的应用

以编排输电线路检修计划为背景开展蚁群算法应用研究。以系统在整个规划周期内输电线路检修引起的供电不足风险增加量最小为目标,同时保证各条输电线路检修启动时段始终控制在可选集范围内,提出并描述了基于蚁群算法的输电线路检修计划模型,实例仿真验证了模型的有效性和实用性。     

基于物联网技术的电力通信检修系统的设计

针对电力通信检修业务,应用物联网射频识别技术、Zigbee技术等,结合《电力行业标准化管理办法》,将通信设备检修作业项目、作业标准、作业方法、作业步骤、安全措施等应用到开发的软件管理平台,利用掌上PDA实现对检修信息的标准化管理,提升电力通信网的可靠性运行.     

计算机辅助杆塔组立施工及其仿真系统的研究与实践

针对输电线路杆塔施工现状，将杆塔组立施工设计的计算方法进行了个性化处理，编制成软件进行设计计算，同时自动直塔组立方案所需的工器具清单，施工过程组立图及现场施工人员的安全作业技术规范，使杆塔施工更加科学化，高效化，系统利用OpenGL图形库在Windows 下实现对杆塔组立施工的动态模拟，论述了图形库数据结构，三维几何造型，计算机图形处理和软件开发，给出了杆塔3D动态运动轨迹动画显示的主要源程序及仿真结果，该系统设计思想与方法对进一步研究500KV以上线路的杆塔具有一定的参考价值。     

安全工器具管理系统

为保障安全工器具存放环境,满足智能化管理需求,解决因存放环境潮湿导致安全工器具绝缘性能下降,以及因人工登记、缺乏门禁管控和视频监控与报警设施等现状导致工器具记录不规范、使用情况跟踪不到位、管理不全面有效等问题,开发了一套安全工器具管理系统,其具备以下几个模块：后台管理软件、RFID工器具管理、综合环境管控、门禁管理、远程监控、报警系统等。系统可实现对库房环境的自动监测和调节,对进入人员进行门禁、出入库自动记录,以及远程视频监视、远程控制等功能,通过技术手段实现对安全工器具的规范化管理,加强安全工器具全流程的实时监督和安全风险的有效管控,确保安全工器具的安全使用。     

基于数字孪生的输电线路树木距离告警方法

针对输电线路附近树木生长快,发现难度大的问题,提出一种基于数字孪生的输电线路树木距离告警方法。通过视频摄像装置对输电线路下方的树木进行识别,获取树木的特征信息;构建输电线路树木的数字孪生模型,对树木的生长周期和可能造成的输电线路危害进行仿真;通过贝叶斯网络对树木可能造成的输电线路事故进行置信度分析,生成输电线路树木距离告警事件,并通过移动作业终端提醒运行检修人员进行数障处理。通过对输电线路树木距离告警的实例分析,验证本方法的有效和可行性。     

基于光纤传感网的高压输电塔线状态监测系统

电力系统是国民经济命脉,高压输电线路是电力系统的桥梁。实时监测高压输电线路的状态安全对国民经济至关重要。早期,使用人工巡查监测线路状态,之后使用无线传感设备监测线路状态。人工巡检效率低下且不能实时监测、无线传感设备易受高压线路电磁干扰。光线传感器以其抗干扰能力强、传速速度快等特点能够解决高压输电塔线监测的安全性和实时性问题。首先根据高压输电塔线需监测的物理量研制光纤传感器,其次架设光纤传感网络,然后设计开发高压输电线路监测软件平台,最后,根据西靖线的实际情况布设传感器、构建传感网络、部署监测平台得到实时监测数据。系统能实时接收传感器数据,监测高压输电线路状态     

基于冰雪灾害影响下的高压输电线路的设计与维护

高压输电线路一旦出现故障,将造成严重的损失。因此,电力部门将其列入重点防护对象,尤其在冰雪等恶劣环境下,输电线路的损毁严重。文章分析了冰雪灾害下的高压输电线路故障及其维护方式。其中包括提高电网规划的设计标准、优化高压输电线路的走向、采用防止电网覆冰的技术措施以及提高输电线路事故预防和检修能力。以确保电网能够安全、稳定的运行。     

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。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。