一种支持ModbusTCP协议的OPC UA服务器中间件

OPC UA技术凭借本身设计架构的优势,已成为工业4. 0在通信实施方面首推的技术。研发了一种基于OPC UA技术的工业现场通信中间件。此中间件内部实现了OPC UA服务器,通过ModbusTCP协议,读取待采集数据并以统一格式存储在OPC UA服务器地址空间中,向其他OPC UA客户端提供数据访问服务。同时,采集的数据也会存入关系数据库中,以数据库表的形式对外提供数据访问服务。使用此中间件,可减少数据采集的工作量,且凭借OPC UA技术跨层传输数据的优点,简化工业系统间数据访问难度。     

OPC UA over TSN技术路线及分析

OPC UA over TSN通过提供一个实时开放互联的工业通信网络架构,满足工业生产安全、确定性时延和高可靠的需求,弥补传统实时工业以太网在易用性、互操作性、带宽上的不足,是当前工业互联网领域最重要的创新技术。从芯片制造商、IP Core软内核以及设备制造商三个方面,对当前TSN技术及实现进行了研究和分析;从商用和开源的角度,对OPC UA协议软件实现现状进行对比分析。在二者现状分析结果的基础上,提出FPGAs/SoCs是当前OPC UA over TSN技术实现的最佳路线,并建议OPC UA基于开源的open62541实现,TSN独立开发IP Core以掌握核心技术。     

基于OPC UA的电厂水务数据采集系统设计开发

在传统的工业制造领域,现场设备的基于开放通信标准的无缝集成是进行工厂数据采集和统一监控的必要条件。作为一个开放的协议,基于OPC UA的数据采集系统可以解决现场工业设备通讯协议的多样性带来系统软件开发的复杂度问题。以电厂水务系统中存在的各类感知层设备为对象,通过建立基于OPC UA的数据通信规范,将智能传感器、智能控制器和扩展通信接口后的普通IO设备连接到OPC UA服务器,实现现场数据的采集;再通过建立合适的客户端系统,实现对采集数据的数据库存储和在线访问。运行结果表明该系统的设计符合电厂水务系统的实际需求,为系统提供了精确及时的基础数据,提升了系统的管理效率。     

图形化在线建模的OPC UA网关设计

OPC统一架构(Unified Architecture,UA)已经成为工业4.0的核心通信接口规范,但由于工业领域设备更新缓慢,大量现场设备仍使用传统的通信协议,且设备生产厂家不同,使用的通信协议也可能不同.为了将不同类型的现场设备融入OPC UA架构,克服多种通信协议之间的数据交换壁垒,本文设计了一种支持图形化在线建模的OPC UA网关.网关内部实现了OPC UA服务器,能够将多种通信协议数据连接到OPC UA服务器地址空间的节点上,方便MES和ERP等管理软件进行高效数据访问.同时,为了便于使用者建立OPC UA信息模型以及配置网关数据采集逻辑,设计了一种图形化建模方法.最后,本文通过示例,验证了图形化在线建模网关的可用性.     

基于OPC UA的管控一体化研究

重点研究了OPC基金会新推出的OPC UA(Unified Architecture) 范,揭示了该规范在信息的全集成中跨网络、跨平台及信息集成的可靠性、安全性等方面相对于现有OPC规范的巨大优势,介绍了它对工厂管控一体化进程的重要推进作用.     

面向服务的物联汇聚平台的研究与开发

针对离散制造业现场设备层与上层应用系统(如ERP,MES,PLM系统)之间信息流不顺畅、数据结构异构、信息中转次数多、系统集成复杂度高的问题,提出了一种面向服务的物联汇聚平台,采用OPC UA技术使工业异构系统互联,为智能制造体系提供工业物联网平台系统解决方案。设计了灵活多样的驱动模块解决现场设备及系统异构问题,基于OPC UA地址空间的数据组态模块解决数据结构不统一的问题,最终实现数据及文件的跨层传输,简化系统集成复杂度。通过OPC UA客户端程序与Modbus模拟器程序测试,系统运行良好。     

用VB编写OPC客户端程序的方法

OPC为工业现场设备通信提供了标准,本介绍了OPC技术的原理,简要介绍了如何用Visual Basic开发OPC客户端程序。     

基于FDT与OPCUA的设备集成研究

本文介绍了FDT技术以及它在现场设备集成中的应用,然后通过研究分析,指出了FDT集成平台过于依赖微软操作系统、与企业上层网络的不完全兼容性,以及现行OPC服务器安全可靠性存在不足.为此,本文通过引入OPC UA技术,建立一个基于FDT、OPC UA的设备集成模型解决了上述问题.     

板坯跟踪系统中的OPC接口研究及应用

OPC技术是实现控制系统现场设备级与过程管理级进行信息交互的关键技术,是实现不同的现场总线协议之间互操作的重要手段.通过在板坯跟踪系统中应用了OPC技术,介绍了OPC数据访问规则,以及OPC接口的相关概念、接口标准,实现了通过OPC接口连接不同的现场总线,完成了现场设备级与过程管理级网络的信息交换.给出了OPC服务器、客户端的相关设置,客户端开发的基本步骤,并讨论了OPC技术应用于工业现场领域所产生的效益以及其发展前景.     

基于FDT的OPC跨平台数据访问研究

在解决分散控制系统(DCS)中多平台的数据访问和集成问题时,必须为每个不同的平台开发一个相应的数据访问接口和服务器。在研究FDT技术的基础上,提出一个基于FDT技术的OPC跨平台数据访问模型,利用该模型解决了在DCS系统下数据访问依赖于设备的现场总线类型、厂商和设备特点的问题。     

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。