PLC及其组态软件在电梯模型中的设计与应用

着重阐述以可编程控制器（PLC）为控制中心的电梯自动控制系统运行原理,利用组态软件组成的监控系统对电梯模型进行实时监控,并且通过与上位机数据通信实现网络化管理。     

视频采集板双网卡WinCE5．0驱动的实现

为便于对电梯进行管理、维护及实时监控,设计了一种基于WinCE5.0的双网卡电梯远程监控系统.在简要分析了双网卡视频采集卡工作原理和详细研究了WinCE5.0网络驱动模型的基础上,开发了基于S3C2440和DM9000的WinCE5.0双网卡驱动程序;同时,深入剖析了WinCE5.0网络驱动模型和驱动模型加载过程,并给出了中断服务处理和数据收发处理的流程图.测试结果表明,该双网卡驱动程序实现了预期功能,能够满足电梯远程监控系统对大批量数据传输的工作要求.     

基于Logistic回归的电梯健康评估

电梯的隐患故障与其运行状态存在着一定的关联性.根据电梯的组成要素、体现电梯健康状况表征,合理选择评价参数,基于logistic回归方法建立评价模型.通过分析评价模型基本原理,整合原始数据、引入惩罚因子、交叉验证、高阶拟线性等方法,解决了数据不均衡现状和差异性,提高了评价模型准确度,达到了对电梯健康实时监控并预警.     

基于Lonworks技术的电梯控制系统的设计

电梯是现代高层建筑不可缺少的交通工具,目前多数电梯采用PLC控制.本文提出了一种基于Lonworks现场总线技术的电梯控制系统的设计方法.论文先介绍了Lonworks现场总线技术的概述,然后重点介绍了电梯控制系统的硬件组成:电梯控制系统由四部分组成.分别是电梯控制硬件模型,控制模块,LonBuilder开发平台,本地监控机.并且编制程序调度电梯运行.实验测试达到了预期的效果.     

电梯控制系统及远程监控系统设计

介绍了Rockwell PLC在透明仿真教学电梯模型中的应用,说明如何实现一个电梯控制系统.并应用RSView32软件设计人机界面实现远程监控.     

基于PLC控制的实验电梯监控系统研究

目前各工科院校都开设了PLC课程,针对PLC的实验课,电梯是常用的典型被控对象,主要研究在当前教学形势的发展下,将可编程序控制器(PLC)应用于电梯进行逻辑控制,借助于计算机的控制系统监控软件-组态软件,生成画面中的图形对象并实现与PLC的通信,来模拟PLC被控对象。为增强实验课的教学效果,针对实验室的电梯模型(电梯模型用CPU224型PLC控制,具有实际电梯的基本功能),利用西门子S7-200可编程控制器编写了相关的控制程序,用"组态王"软件制作的人机界面实现了对PLC控制的4层电梯的监控。该系统具有很重要的教学和实际意义。     

基于物联网技术的电梯远程监控应用探讨

电梯运行状态远程监控是实现电梯安全管理的重要基础。物联网作为现代信息技术发展的重要产物,在电梯远程监控系统设计中具有重要的应用价值。通过物联网技术构建多层次、多维度的远程监控系统,能够实现电梯运行监控的全覆盖。基于此,从系统架构、远程监控平台和实践应用等方面,具体阐述了如何实现基于物联网技术的电梯远程监控,以期为相关领域提供一定参考。     

基于GPRS网络的电梯远程监控终端设计

本文首先介绍了传统的电梯监控采用的相关技术,通过分析了解了电梯有线监控的局限性,现在随着无线技术的飞速发展,提供了通过无线GPRS网络对电梯进行监控的可能性,本文重点研究了电梯无线监控终端的设计及实现。     

基于组态软件监控的智能电梯群控系统设计

随着高层建筑的不断出现以及人们对电梯服务质量要求的持续增高,智能电梯群控系统已经广泛应用到人们生活的方方面面.提出了一种基于组态软件监控的智能群控电梯系统设计,并结合当今流行的组态监控软件设计出了上位机软件,用以监控电梯群的运行,实现了多电梯高效运行,提高了电梯系统的服务效率和控制水平.     

基于N:N网络的电梯群控系统设计

本文在分析群梯控制技术和N:N网络技术的基础上,提出了基于N:N网络的电梯群控系统(ECCs)设计方案,对3-8部电梯组成的梯群实施统一管理与监控.为了验证设计的可行性,在实验室内搭建了3部模型电梯,经试验测试,在数字量和开关量两种模式下都可以满足群梯控制的要求,并实现了群梯系统的计算机监控.     

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.