基于DL/T645规约的电能表集抄无线传感器网络MAC协议设计

随着智能电网的发展,电力行业对各种电能表终端的远程、实时管理,以及对抄表数据的通信需求成为一项重要的研究课题。将无线传感器网络用于多功能电能表数据通信,需解决各层协议的通信机制和与DL/T645规约匹配等问题。文中提出了一种改进型的基于IEEE802.15.4的QoS-MAC协议,并针对电力DL/T645规约的电能表各类数据传输的特点以及集中抄表无线传感器网络的数据通信需求,构造了一种具有实时性和可靠性服务质量的无线传感器网络MAC层模型。     

IEC104规约与DL/T 645规约转换的设计与实现

介绍了DL/T 645规约与IEC60870-5-104规约转换的模型及其软件实现,实现了智能配变终端既能实时监测电能表的数据,又能实时与主站通信。经过反复调试运行,验证了该规约转换的可靠性。     

基于电力载波技术的建筑设备物联网节点研制

为实现建筑物内用电设备的实时信息获取、监控及节能优化等目的,提出了以电力线载波技术和Internet技术为核心的建筑设备物联网系统架构,研制了该系统关键部件——物联节点.实现了以太网通信和电力线载波通信间协议转换、数据转发等功能.其硬件主要采用LPC1768 ARM7作为主控芯片结合DP83843以太网PHY芯片和MI200E电力线载波芯片完成,结合相应软件实现了建筑用电设备与Internet技术的完美融合.该物联节点的实现使得构建建筑设备物联网这一复杂网络成为可能.     

基于OPC UA的工业生产系统实时数据稳定性探索

在国家大力支持“新基建”推进的背景下，智慧城市建设项目相继实施，智慧水务、智慧工厂是智慧城市概念在具体行业中的体现，但由于实时数据跨软件平台、跨操作系统版本造成实时数据不能安全、稳定地通信，因此研究工业数据实时通信的安全与稳定十分重要。以提升工业生产系统实时数据稳定性为出发点并结合现场实际应用，探索升级通讯协议之后是否能改善跨系统间数据通信稳定性低的问题。     

基于STM32的电能手抄系统设计与实现

综合考虑目前抄表系统在实际应用中的一些弊端,介绍了一种基于STM32并嵌入μC/OS-II实时操作系统的电能手抄系统的设计与实现方案。该系统采用JF24C无线通信模块,并对多功能电能表通信规约DL/T 645-2007协议进行解析和转换。最后,通过测试表明该手抄系统能够快速准确地完成对电能表数据的采集和传输等功能。     

基于RS485接口的电能计量数据采集

利用三相电子式多功能电能表所带RS485接口，采用研华公司的PCL-745B数据采集卡实现电能表和管理微机的连接。根据DL/T645-1997通讯规约，采用Delphi语言利用SPComm通信控件编写通信程序，讨论了串行通信编程中通信命令的发送和状态字接受的问题。     

基于雾架构的工业物联网通信机制与算法研究

传统的云架构面临着网络负载过大、端到端延时长等问题。因此,利用基于雾架构的工业物联网通信机制与算法对传感数据进行采集处理,构建网络模型和能耗模型;选择期望传输能耗最小的节点作为转发器,通过雾服务器节点收集工业现场的传感数据;通过仿真实验将该通信机制与其他方法进行对比和评估。实验结果表明,该通信机制与算法可以有效收集工业现场的传感数据。能耗、第一死亡节点等指标比其他算法更具有优越性,为改善工业现场应用提供了新的解决思路。     

基于CAN总线的电机监测与控制系统设计

针对工业现场电机运行状态的实时监控,设计了一种基于CAN总线的电机监测与控制系统。系统分两部分:现场监控节点和上位机,二者通过CAN总线网络进行数据通信。现场监控节点以数字信号处理器TMS320LF2407为核心,采集电机运行时的电量及温度信息,判断电机的运行状态,通过CAN总线网络实时上传至上位机,上位机也可对现场监控节点进行控制和设置。设计了系统各部分的硬件电路,在此基础上,设计了系统软件。系统结构设计简单、可靠性高,具有一定的工程实用价值。     

基于冗余CAN总线的实时通信系统设计

针对航天现场工业环境对通信系统的可靠性有较高的要求,该文提出了基于冗余CAN总线的实时通信系统设计方法,该方法为系统的CAN网络主节点进行节点冗余设计,同时对CAN网络中的每个节点进行总线冗余设计.当主节点出现故障时系统切换到备份主节点工作,当总线出现故障时系统切换到备份总线上工作.该系统制定了统一的通信协议,系统主控模块FPGA对整个CAN网络中的节点进行实时监控,有效提高了系统数据传输的可靠性.     

三相智能电能表的GPRS远程采集模块设计

针对电力公司无线通信模块外置的三相智能电能表的应用,使用 STM32 F103设计了 GPRS远程数据采集模块,以实现 Q/GDW1376.12013主站上行协议、电能表DL/T645-2007下行协议和一类实时数据、二类冻结数据的采集/存储功能.远程采集模块使用下行 RS485接口抄收电能表数据,并存储电能表数据于远程采集模块外扩的 DataFlash内,最后通过SIM900A上报给采集主站.经过协议一致性测试,GPRS远程采集模块具备了国网采集终端的基本功能.     

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。