基于WinCC和Step7的S7—400H冗余系统的实现

介绍了基于WinCC和Step7的S7—400H冗余系统的软件配置和组态方法。进一步分析了S7-400H冗余系统的工作过程。对Step7和WinCC软件的使用方法作了说明。     

基于Step7和WinCC的焦炉集气管压力分级控制系统

针对采用常规控制方法对焦炉集气管压力控制效果差、无法满足要求的现状,运用模糊控制和解耦控制原理以及Step7和WinCC软件,在已有焦炉集气管压力控制系统基础上提出一种基于模糊解耦控制的分级控制系统;介绍系统控制策略、程序开发、监控界面设计及系统运行调试等;运行表明:该系统控制效果良好,其控制精度、抗干扰能力等技术指标优于原指标。     

S7-300 PLC在番茄酱杀菌自动控制系统中的应用

番茄酱杀菌温度控制是番茄酱加工生产线中的关键环节.基于西门子S7-300 PLC,研究开发了番茄酱杀菌自动控制系统,利用Step7编程软件设计了杀菌温度PID控制器,并通过组态软件WinCC对控制器进行了模拟仿真,验证了算法的有效性.仿真研究和工程应用表明,该控制方法经济可靠,达到了预期效果,具有一定的推广应用价值.     

现场总线PROFIBUS在电动执行机构中的应用

通过PC＋CP5611做主站,PB-OEM2-SE接口板和它的实验板做从站,利用组态软件Step7、WinCC和SIMATICNET来实现PROFIBUS主站和从站之间的通信。     

基于西门子PLC一体化实验平台的开发与设计

针对电气专业PLC课程的实践教学,设计了开放式一体化实验平台.合理运用西门子组态软件WinCC、Step7编程软件开发了实践内容,设计了实验平台的结构,给出了硬件配置.实践表明,该实验平台不仅满足了教学的需求,而且满足了教师科研的需求.     

单交叉路口交通灯实时配时算法的研究

研究了城市道路交通信号实时控制系统的问题,重点论述了单交叉路口交通信号灯控制(点控制)模型的实时配时算法.根据城市交通流分布规律,设计出流量序列生成算法来模拟实时交通流;通过建立信号灯动态模型从而获得最佳周期长度和有效绿灯时间,然后采用模糊控制算法对信号灯配时方案进行实时的动态优化调整,并建立基于排队的车辆延误模型来对模糊控制算法进行评价.计算机模拟仿真的结果表明所设计实时配时方案比定时配时方案有显著的改善.     

修改WinCC已归档数据的方法

WinCC已归档的数据按照一定的算法保存在数据库中,用户不能对它任意修改,本文介绍了两种方法来实现对WinCC已归档数据的修改,一是直接编写脚本语言,二是通过第三方软件,设计一个控件,从而间接访问WinCC数据库。关键在于灵活运用ODK,对WinCC功能进行了拓展。实际的运行效果证明,利用上述两种方法都实现了对WinCC数据的插入。     

基于模糊子集合拟合对非线性系统的模糊控制

实际受控系统都存在非线性和不确定性，使得参数化模型控制算法难以实施．为此，提出一种非参数化模型的模糊控制算法，即在非线性系统中对局部过程实施模糊分段线性化，对分段线性化的过程进行联接，将分段线性化的模糊模型集合拟合为全局非线性模型．其控制律是由局部线性化的模糊控制律经模糊联接而构成整体非线性系统的模糊控制律．通过稳定性证明和仿真验证，论证了所给算法的有效性．     

基于神经网络模糊PID的足球机器人控制算法研究

通过对足球机器人运动学模型进行分析,以足球机器人系统为实验平台,论证了神经网络模糊PID控制技术应用于足球机器人运动控制的可行性。将传统的PID控制与神经网络模糊控制相结合,通过PID算法实现控制的准确性,利用神经网络模糊控制提高控制的快速性与自适应性。针对足球机器人运动控制中的实际问题,着重提出了基于神经网络和模糊控制相结合动态调整PID控制器的三个参数KP,KI,KD的设计方法。实验证明该方法增强了控制器的调节能力和简化了控制器设计,同时本方法对模型和环境具有较好的适应能力和较强的鲁棒性。     

预估控制下的实时网络遥操作移动机器人

构建了能使操作者通过Internet远程实时控制的移动机器人系统．为了补偿网络时延和抵消其对遥操作系统的影响，基于我们以前提出的改进型Smith预估器原理，采用了预估控制策略．为了保证系统稳定性和透明性，基于主从端的传感器信息交换，设计了一个动态模型管理器，其中模型和力反馈误差调节通过模糊控制实现．除了力反馈外，为了增强遥操作的实时性，引入了预估的虚拟显示．为了精确地预测网络时延，提出了一个新颖的时钟同步算法．为了降低时延抖动，结合我们提出的两个算法，实现了数据缓冲策略．最后，通过长距离的网络遥操作实验验证了系统和控制策略的实用性和有效性．     

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     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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。