嵌入式Linux软逻辑控制器及其图形开发软件设计

研究了嵌入式软逻辑控制的实现及应用,选用ARM9微处理器和嵌入式Linux操作系统构建了软逻辑控制器软硬件平台。由于Linux环境下的控制程序开发较为复杂,所以基于VC/MFC和Cygwin开发了一款图形开发软件,实现在PC环境下通过功能块编程方式编写软逻辑控制程序。使用者能够在线监控程序运行状态及调整模块参数,从而实现了编辑、编译和调试运行的无缝接合。测试表明,该系统使用户开发和调试软逻辑控制程序更加方便,对于替代传统PLC的场合具有一定的应用价值。     

移动式油井计量站系统的研制

针对传统计量方式对于高含水油井、间歇出油井的原油计量误差大,且无法实现混串井、低含气井的产量计量等问题,提出移动式油井计量站系统设计方案。移动式油井计量站系统采用4G网络技术结合PLC控制对油井、油气、水三相计量装置进行智能化研究与设计。PLC组成的采集终端对油井的油、气、水进行三相分离,并对压力、流量、温度等数据进行采集和处理,通过4G网络连接入远程服务器,实现工业控制计算机现场实时数据的监视、预警及对参数设置等功能。该系统的研究实现了油井自动计量监测的无人化、网络化等远程智能控制与管理功能,对油田的数字化建设具有重大意义。     

烧结烟气活性炭脱硫脱硝中二氧化硫检测方式改进

针对烧结烟气活性炭脱硫脱硝工艺中脱硫层后二氧化硫检测点位置多导致分析仪等设备投资过高的问题，提出一种多点轮巡的气体检测方式。方式采用多组气动阀作为样气采样阀、切换阀和排放阀。设计气体取样顺序控制逻辑，应用PLC自动控制实现。最终达到一台气体分析仪周期性检测12路样气的功能。分析仪PLC通过Modbus通讯将测量结果上传至主PLC系统。满足工艺检测要求的同时，大幅降低仪表设备的采购和施工成本。     

利用PLC和IPC实现原油自动计量

本文介绍了利用PLC和IPC实现原油自动计量的工作原理和过程,阐述了系统实现的硬件组成、软件流程,最后着重介绍了PLC＋IPC在计量中应用的技术特点及其应用效果。此项目已在鲁宁长输管线的多处计量站应用成功,在测量精度、系统稳定性、工作效率、可靠性及可操作性等方面,取得了良好的标定效果。     

基于西门子PLC 300和组态王的电梯控制器设计

随着智能控制技术的发展,电梯控制技术经历了继电器控制、PLC控制和计算机控制的历程。传统继电器控制方式由于其采用硬接线、控制速度慢的缺点逐渐被PLC所代替。利用功能强大先进的西门子S7－300 PLC软件和组态监控软件组态王6．53来实现对电梯的PLC逻辑控制、仿真和监控。为了改善电梯的舒适度和节能,采用了带有转速反馈的矢量控制变频器,并对该变频调速技术进行了简单介绍。     

基于嵌入式软PLC分布式控制系统设计

为了确保PC端主机所生成指令程序满足PLC控制原则,使PLC编程器的逻辑编译能力得到保障,提高指令编码准确性,设计基于嵌入式软PLC分布式控制系统。根据软PLC定义标准,确定系统结构的组成形式,再通过分析工作执行机制的方式,完成对嵌入式软PLC系统的技术基础研究。在分布式体系中,同时开发I/O驱动程序与PLC执行程序,并联合下级PLC编程器设备,确定CODESYS工程组件的实时运行状态,完成分布式控制系统的I/O组件设计。按照实时内核的进入与退出模式,定义分时映像区取值范围,借助数据库主机中存储的控制指令执行程序,求解指令逻辑栈表达式,实现对软PLC驱动模式的规范,完成基于嵌入式软PLC分布式控制系统设计。实验结果表明,本次实验所选10条指令程序的PC端输出结果均满足PLC控制原则,在保障PLC编程器逻辑编译能力方面具有突出作用价值,且能够有效提高指令编码准确性。     

可编程逻辑控制器的平行Petri网设计与实现方法

为了实现可编程逻辑控制器(PLC)的形式化设计, 定义了一种可以感知和执行的新型Petri网, 称为平行Petri 网. 将输入输出变量映射到库所结点上, 描述了PLC的Petri网模型的一般设计方法, 进而给出了其动态演化算法. 通 过C语言和TwinCAT联合编程, 使得Petri网与被控物理对象平行演化, 实现了Petri网对物理过程的平行感知和控制, 并完成了实验验证. 该方法可以缩短控制代码的开发周期, 简化程序复用的复杂性, 为平行系统在PLC工程中的应 用提供了有效工具.     

基于PLC的煤气计量系统

本文介绍一种基于PLC的煤气计量系统。以昆明市煤气计量站的煤气计量系统为例,阐述了该系统的体系结构。该系统采用主、备份机同时运行的方式,保证数据采集的不间断。系统实际运行稳定、数据采集准确。     

基于MCGS的可编程逻辑控制器仿真实训平台设计

文中将可编程逻辑控制器(PLC)控制系统与组态界面设计相联合,开发了基于MCGS组态软件的PLC仿真实训系统.以图形动画方式形象逼真的动态仿真控制对象的运行状态和PLC控制过程,生动直观,便于控制系统实践调试,能激发学生实践的兴趣,加深学生对知识的理解,该平台适合可编程逻辑控制器课程三级项目或课程设计.仿真实训平台具有...     

牛奶加工混料过程中的PLC控制

本文主要针对牛奶加工过程中的配料环节,采用PLC结合液位传感器和辅料精准计量装置严格按照配方执行,保证牛奶的品质和口味。该系统由传感器及变送器、PLC控制系统、人机界面就地显示仪表、气动开关阀等设备组成,实现计量、控制和管理的高度统一,有效地解决了以往人工操作时劳动强度大、且存在较大的计量误差,产品合格率不高且不稳定的问题。     

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。