基于PLC和组态软件的变频器监控系统设计

提出了一种基于PLC和组态软件的变频器监控系统的设计方案。该系统由安装有西门子WinCC V6.0组态软件的监控主机、S7-200 PLC和多台带有RS485通信接口的变频器组成,S7-200 PLC一方面通过串行通信口与监控主机通信,接收监控部分对变频器的参数设置和控制命令;另一方面通过RS485总线与变频器通信,对变频器进行启停控制、频率增加控制等操作。现场调试和运行表明,该系统实现了变频器运行过程和状态的远程监控,有效地提高了生产过程的自动化和智能化水平。     

工业设备基于物联网远程PLC控制系统设计

将通讯技术、工业物联网技术融入工业设备的PLC控制系统中,设计一种可视化远程监控控制系统。基于西门子S7-200Smart硬件平台和HMI触摸屏,运用STEP7-Micro/WIN SMART对控制程序进行软件编程,实现对设备的本地监控;利用RS-485总线、Modbus协议及工业物联网技术实现对工业设备随时随地的远程监控、故障报警及大数据收集功能。     

轮胎车间空调设备自动化系统设计

本文是基于西门子S7-200、S7-300系列PLC和富士变频器实现工厂车间空调、冷冻水系统、冷却塔系统、空调通风系统的整体控制。同时利用WINCC组态软件实现车间的所有设备的远程监控,降低设备管理成本,提高效率。     

基于PLC与WinCC的采煤机监控系统

采煤机工作环境的复杂性对监控系统提出更高要求,为提高其可靠性与实时性,采用了分布式系统结构,通过PROFIBUS-DP总线技术实现系统网络配置,设计搭建了以SIMATIC S7-300 PLC为控制核心和以WinCC组态技术为平台的采煤机远程监控系统。根据系统的监控要求,完成了PLC硬件配置、上位机监控系统以及远程在线监控设计,实现了采煤机工况数据的在线显示、故障报警和远程控制。     

水煤浆退火炉监控系统的研究与设计

针对用水煤浆作为燃料钢管连续退火炉工艺要求,采用“组态王”为监控软件,用可编程序控制器S7-200(PLC)作为下位机的控制(IPC+PLC系统)方案。退火炉的炉温、烟气含氧量的采用智能PI变频控制,提高控制精度和燃料的热效率,降低引风机电耗。系统集数据采集、通信、设备状态控制和数据管理一体化,实现远程监控,取得了良好的经济效益。     

基于PLC的实时测量技术在远程污水监控系统中的应用

提出了一种以西门子S7-200 PLC为核心的分布式远程污水监控系统,重点叙述了该方案的PLC硬件和软件实现。     

基于PLC和GPRS的远程环境监测系统设计

介绍了远程环境监控系统的架构.西门子S7-200 PLC通过GPRS DTU主动上数据中心发送污染源状态的实时数据,并能够在指定的时间段内接收上位机指令,进行历史数据查询.上位机利用VB6.0的Winsock控件接收多台数据采集终端的数据并进行处理.实现了远程环境监测.     

基于WebAccess自动控制系统研究与实现

本文提出了基于网际组件WebAccess的远程控制系统。系统中利用WebAccess与下位机西门子PLC S7-300间通信,实现了远程监控及实时分析的网络控制系统,以较低的成本完成了对PLC控制电机系统的远程在线实时监控。     

基于西门子S7-200与组态王的十字交通灯控制系统设计

本文分析了十字交通灯的控制需求,利用西门子系列的S7-200型PLC与上位机即工控组态软件组态王6.53实现了十字交通灯控制系统的设计。基于PLC和工控监控软件的系统具有抗干扰强和运行可靠等优点,本设计为十字交通灯监控的可视化,网络化,区域化,远程化的研究打下基础。     

SIEMENS S7-200在核子秤箕斗定量装载控制系统中的应用

文章介绍了一种基于SIEMENS S7-200 PLC控制的核子秤箕斗定量装载系统的构成和工作原理。该系统核心采用CPU 224XP CN完成高速脉冲计数及运算,采用CP243-1通信处理器,通过工业以太网连接PLC和上位工控机,通过PC Access建立OPC服务器实现S7-200 PLC和组态软件的数据交换,实现井下数据实时远程传递到井上。现场运行结果表明,与原有的单片机控制系统相比,该系统动态计量精确度高,适应环境能力强,抗干扰性强,远程传送数据可靠,程序开发周期短,系统维护简单。     

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.