分级式CNC系统中串口通信设计

针对在开发分级式三维数控系统系统中遇到的重点,难点问题——上下级通信处理,介绍了基于ModBus协议的串口通信来实现上下级通信的可行性和有效性。并对ModBus协议做适当改进,着重分析了通信实现中遇到的几个关键问题并给出解决方法,实验表明设计满足需要。     

ModBuS协议在变电站监控组态软件中的实现

ModBus协议是工业控制系统中的一种常用的通信协议。由于该协议的简单和通用性,得到众多仪器厂商的支持,正成为仪表及智能终端的工业标准,在工业监控系统中得到了广泛的应用。在变电站综合自动化系统中,许多厂商提供的智能仪表和设备都提供了基于ModBus协议的通信支持。该文基于面向对象的设计思想,阐述了ModBus协议在变电站监控组态软件中的具体实现,为监控主机和支持ModBus协议的各种智能仪表之间的数据通信提供了一种技术方法。     

ModBus RTU单片机通信程序编写方法

讲解如何利用ModBus通信协议,实现触摸屏与单片机的通信。详细介绍了单片机通信子程序、单片机应答程序、CRC校验程序的编写方法,给出了各程序的流程图。     

通过ModBus通信监测10KV配电站

针对工厂配电室的各种仪表型号多,数据量大,无法查找历史数据的问题.本文通过ModBus协议通信现场仪表,很好的解决的各种仪表通信及监测,数据记录,报表打印等.     

基于ModBus协议的大屏幕在线监视系统设计

根据污水处理过程中复杂工艺参数的监视问题和某污水处理厂自动化监控系统设计方案,提出一种基于ModBus协议的大屏幕在线监视系统的设计方案,实现与上位组态软件之间的数据通讯。文中介绍了大屏幕在线监视系统的设计方法和硬件结构,上位组态软件的接口程序,并详细阐述ModBus通信协议以及单片机通信程序设计。目前,基于ModBus协议的大屏幕在线监视系统已经投入运行,并且成功接入到污水处理厂自动化监控系统中。该系统组态简单方便,数据通信稳定可靠。     

基于AVR ATmega128的工业网关的实现

介绍一种桥接不同现场总线网络的解决方案。该方案采用高性能AVR ATmega128为其控制核心。AVRATmega128采用ModBus/RTU协议与计算机通信,通过多处理器通信模式与其他分控设备通信。本方案经过在实际中运行,证明其设计是可行的。     

基于ModBus/Tcp协议和自定义协议的机器视觉智能终端的设计与实现

提出了一种基于WinCE、ModBus/Tcp协议和自定义协议的机器视觉智能终端的实现方案,解决了传统机器视觉系统应用中因为采用计算机而造成的不便.机器视觉智能终端体积小、便携性好、操作方便,非常适合在工业现场应用;机器视觉智能终端通过以太网、采用ModBus/Tcp协议和自定义协议与智能相机通信,最多可同时连接4个智能相机,相对于计算机价格低廉,宜于大规模应用.     

一种MODBUS——ProFiBus节点通信控制与协议转换模块设计

多种现场总线协议并存给制造业信息化与自动化中的设备互联与信息互通造成困难;通过对ProFiBus及ModBus协议研究发现这主要是由报头报尾格式的差异造成,为解决异种协议互联问题,提出一种具有这两种协议和接口的通信控制与协议转换模块的设计方法,利用不同接口支持两种不同协议,硬件实现ProFiBus协议,软件实现ModBus协议,以UCOSⅡ为基础,用软件提取源报文用户信息,并依据目的节点协议生成新的报文实现两种协议报文转换;经测试,该方法实现了ModBus协议智能装置和智能传感器与ProFi-Bus网络的互联。     

基于ModBus协议的变频器VC++控制系统

介绍了采用ModBus协议中的ASCⅡ模式实现计算机对变频器的参数传递、运行控制以及实时监控等。通过Visual C 6.0的MSComm控件完成对整个系统控制程序的串口通信控制,并给出了通信所需硬件RS232/485转换器的具体设计。通过实验表明,所设计的变频器具有良好的稳定性和可靠性。     

基于通信计费的数据采集网络模式的研究

目前通信计费的方式有很多种,通信计费的数据采集已成为现代通信企业最重要的一个工作环节。本文主要 对通信网络计费数据采集与传输系统的现状,以及通信计费的数据采集网络模式进行详细的分析。希望通过本文的阐述,可 以给通信计费的数据采集网络模式应用方面提供参考。     

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。