An Open Standard Protocol for Networking of Energy Meters

An open standard protocol for networking of energy meters under the simple network-management protocol (SNMP) environment is proposed. Since the SNMP is quite popular for network enabling of uninterruptible power supplies, the necessary support hardware and software already exist. Hence, migrating energy meter connectivity to the transfer control protocol/Internet protocol-based SNMP would be an easy task. A sample network is created under the LabVIEW virtual instrumentation environment and studied to validate the proposed open standard protocol for networking of energy meters.     

企业计算机网络维护平台搭建及治理案例分析

随着企业信息化的推进,计算机网络系统的及时维护,成为企业面临的难题。面对网络中复杂的数据信息交换,分辨异常流量、提高流量"可视化"程度,是解决问题的基本思路。文章介绍企业通过网络设备结构和监控防御布局,完善物理和逻辑链路,搭建了企业计算机网络维护平台,使计算机网络系统的维护变得规范简化,提高了事件响应时间。此外,恢复计算机网络正常运行的最有效策略是对网络异常流量进行及时治理,并对具体事例进行了介绍。     

开放式玻璃自动切割机计算机控制系统

文章介绍一种自行研制的玻璃自动切割机开放式计算机控制系统，并针对该切割机加工范围大、惯性大、动态精度要求高等特点，研究了一种智能适应型PID控制算法。现场测试表明，该系统在功能、性能和控制精度上达到或接近国外同类产品的先进水平，在系统硬件和软件的开放性上优于国外产品。文中详细介绍了该计算机控制系统的功能、系统设计、控制算法及其调试结果。     

Guest Editorial Virtual Laboratories: Enhancing Deep Learning in Model-Based Knowledge Domains

The ten articles in this special issue focus on quality laboratories that can be accessed via the World Wide Web.     

基于改进Q学习算法的低压电力线通信组网及维护方法

为提高组网稳定性,选取合适的低压电力线通信(LVPLC)拓扑控制方法至关重要。针对现阶段组网方法不具备自学习能力使得对动态变化的拓扑反应能力相对滞后导致网络不稳定的问题,提出一种适用于LVPLC局域网多约束的改进Q学习算法。该算法基于绑定载波侦听多址接入协议,将非对称信道组网系统建模为离散Markov决策过程。通过与未知环境的不断交互,关联注册节点信息,建立路由表,经周期性地在线学习训练,节点选择较优的转发方向,优化以网关为树根的簇树;周期性地轮换代理,维护并更新骨干簇树网的逻辑拓扑,延长网络生命周期,保证组网的稳定性。仿真结果验证了该算法的有效性与泛化能力。     

基于C/S模式的微机实验室管理系统开发与应用

介绍了以非接触式IC卡为核心的微机实验室自动管理系统的实现原理、软硬件系统的结构和系统功能,分析了IC卡的选择及在windows环境下采用VisualBasic6.0开发C/S(客户机/服务器)数据库管理系统的关键技术和方法。     

智能电网中利用SDN和开流框架进行优化设计的评估研究

智能电网中有效的通信和高自动化的体系结构对电网操作管理者和整个电网系统非常重要,但是这种较高级别的可靠性和效能并不能支撑通信的基础设施。针对此问题,研究评估了利用软件定义网络(SDN)和开流框架(OF)的优化电网。不同于多协议标签交换(MPLS)对基础设施成本高和要求高,SDN解决方案中的开流软件成本低,灵活性好。首先给出机电系统的模型和对应的智能电网原型;然后设计交换机-控制器的最小化延迟、甩负荷控制逻辑和链路故障问题解决方案;最后对SDN中低成本开流软件的模块性和灵活性进行了研究,提出一种开流控制器,提供自动错误转移机制、负载均衡和质量服务保证(Qo S)功能,实验结果表明这些服务功能可以支持真实的智能电网系统。     

“入口”诱人 家电企业如何巧借车联网“赢”销?

正得入口者,得天下。这一生动而残酷的写照如今再次得到验证。近日,国内互联网三大巨头都宣布进入"车联网"领域:阿里巴巴携手上汽布局车联网,百度正在研发智能汽车,腾讯首发路宝盒子试水车联网。而更早些是,百度宣布将旗下"百度导航"业务完全免费,以更好进入车联网,高德导航也针锋相对,宣布全面免费。     

Experimental Validation of the Learning Effect for a Pedagogical Game on Computer Fundamentals

The question/answer-based computer game Age of Computers was introduced to replace traditional weekly paper exercises in a course in Computer Fundamentals in 2003. Questionnaire evaluations and observation of student behavior have indicated that the students found the game more motivating than paper exercises and that a majority of the students also perceived the game to have a higher learning effect than paper exercises or textbook reading. This paper reports on a controlled experiment to compare the learning effectiveness of game play with traditional paper exercises, as well as with textbook reading. The results indicated that with equal time being spent on the various learning activities, the effect of game play was only equal to that of the other activities, not better. Yet this result is promising enough, as the increased motivation means that students work harder in the course. Also, the results indicate that the game has potential for improvement, in particular with respect to its feedback on the more complicated questions.      

公共计算机基础开放式网络教学实践

计算机文化基础是一门非常普及的基础性课程,是大学生必须掌握的计算机文化和技能.在实际教学过程中就有选课人数过多、学生基础参差不齐、教师低层次重复劳动过多,实际教学效果不高、缺乏网络情景学习与课堂交互启发模式等问题.笔者提倡创设一个基于网络资源的教师指导下的学生自主学习的模式,减轻教师任务,引导学生课后学习,培养学生自主式和协作式学习能力,提高教学效果.     

Impact Assessment of a Microprocessor Animation on Student Learning and Motivation in Computer Engineering

This paper reports on the impact of using custom animation software to teach second/third year computer/electrical engineering students in the microprocessing systems course at the University of Manitoba, Winnipeg, MB, Canada. Over the span of 13 years' experience with teaching the course, the difficulties and limitations with conventional lectures and visual aids led to the development of custom animation of the course material to provide an additional teaching modality to teach the complex and abstract subject matter more effectively. The custom animation software consists of the ability to create and/or modify microinstructions, create and/or modify macroinstructions, and animate the execution of instructions (using the "water-flowing through pipes" analogy) by showing address and data transmission juxtaposed against an animated clock. A postunit, mixed method survey administered to students reveals substantial cognitive gains and modest motivational outcomes, reinforcing the animation's effectiveness and sparking motivation for further research     

ATM组网分析

针对ATM交换技术分析了几个主要生产厂家的交换结构及交换处理能力、呼叫处理、路由重建能力、网络拥塞及信元丢弃处理结果。简要介绍了局域网仿真技术、MPOA协议、语音和视频接入技术的基本内容,对电力系统组建ATM网络规划和选型具有一定的参考价值。     

短距离微功率无线组网AMI技术的探讨

先进量测信息架构(AMI)作为智能电网的基础信息平台之一,是智能电网实现的四大支柱之一。本文分别对先进量测信息架构(AMI)、无线传感网络(WSN)和WSN在AMI中研究和发展进行了介绍,对WSN的体系架构、标准架构、核心技术、产业发展分别作了分析和论述。微功率无线组网AMI是以WSN通信技术为依托,实现了用户电能信息的自动采集、处理和集中存储,为提高供电企业的服务质量,降低供用电成本做出了巨大的贡献。     

开放式计算机监控网络在珊溪水利工程中的应用

珊溪水利枢纽工程地质条件复杂，光纤线路较长，自动化元器件分布较广，需要解决的技术问题很多。通过分析认为，网络和厂级计算机监控系统的可靠性是实现远方控制的难点和重点，决定了整个枢纽计算机控制系统的运行可靠性。最终决定将温州控制中心、珊溪电厂、赵山渡电厂三地网络建设成为环网，计算机监控系统采用全分布开放式系统。     

Educational Laboratories in High-Voltage Engineering

A survey was conducted on the availability of high-voltage educational laboratories in the universities of various countries. The purpose of the survey was to establish whether education in this area of electrical engineering has kept pace with industrial growth. The results show that in the United States only five such laboratories are known to be in active existence. These are not used for instruction but only for research. Elsewhere, 70 percent of all institutional laboratories were built after 1960. The survey has also revealed many interesting and surprising figures regarding the use, the equipment, the size, and the staff of their laboratories. It is concluded that a great need for such facilities to ameliorate the quality of instruction and research in high-voltage engineering exists in the United States.     

基于IEC61850的变电站通信网络组网研究

以IEC 61850-5标准规定的D2-1配电变电站为实例,利用OPNET软件建立了统一组网和独立组网的变电站通信网络仿真模型,并基于该模型对两种组网方式的网络性能和VLAN技术对变电站网络性能的影响进行了对比分析。仿真结果表明:两种方案下各交换机负载独立组网低于统一组网;以太网延时统一组网高于独立组网;VLAN技术对统一组网网络性能的影响较独立组网大。     

智能变电站优化组网的通信网络研究

基于智能变电站对信息共享、网络优化的要求,全站信息一体化已成为未来变电站组网的发展趋势。运用共网技术将间隔层与过程层合并,形成2层1网的优化组网结构。围绕此组网方案,通过网络数据流量的逻辑运算和明确的虚拟局域网(VLAN)划分,在OPNET仿真环境下得到有无VLAN标签的仿真对比图,验证了其网络流量和故障延时满足继电保护对网络通信性能的要求。     

能源互联网的网络化能源集成探讨

随着能源互联网概念的兴起,不同领域对其内涵具有不同的解读。文中将能源互联网的技术实质归纳为一种网络化能源集成技术,将智能电网定位为能源互联网的核心中枢,提出了能源互联网的三层双向网络架构,并将信息物理系统(cyber physical system)概念扩展为cyber,physical and socioeconomic(CPS)系统。将网络化能源集成的关键技术归纳为统一对等的节点模型、能源集成接口体系、网络化集成条件下的运行与控制,以及基于广义大能源网的能量全生命周期管理。     

继电保护系统网络化发展综述

网络化是当前继电保护技术发展的趋势,它可以实现继电保护信息与数据的共享,提高系统的继电保护性能,对电力系统安全稳定运行具有重要的意义。通过阐述继电保护网络系统的网络架构与网络连接方式,分析继电保护网络系统的功能与特点,提出提高继电保护网络系统可靠性的措施,展望继电保护系统网络化未来的发展。     

基于总线的多功能电力仪表组网技术研究

针对多功能电力仪表通信接口与规约的多样性,本文研究了基于总线的多功能电力仪表组网技术。在实验室环境下采用总线技术对电厂与变电站厂(站)用电系统常见的多功能电力仪表进行了组网,开发了一个集成各种规约与接口的数据处理平台,并对系统的数据采集、通信等性能予以试验验证。结果显示,该系统实现了厂站电气监控系统的主要功能,性能可靠。本文研究成果可以在实际的现场工程应用中加以推广,有助于提高变电站、电厂等厂矿企业电气系统的协调控制和运行管理水平。