基于MSC1210和RS485的数据采集系统的研究

本文介绍了一个基于以太网技术和RS-485协议的网络化数据采集系统,远程监控中心和上位机通过以太网使用TCP/IP协议进行通信,上位机和数量众多的下位机数据采集系统之间则使用RS-485串行总线和串口协议进行通信,系统的特点是传输距离远、组态灵活方便,可靠性和实时性都比较高,该实现方案可应用于冶金、化工、煤矿等大型工矿企业的生产过程的远程数据采集。     

太阳能-土壤源复合热泵监控系统的设计

针对太阳能-土壤源复合热泵系统比较复杂的运行调控和状态记录要求,开发设计了一套基于PLC和组态王的监控系统。该监控系统下位机采用SIEMENS S7-200 PLC实现现场温度、流量等信息的实时采集和热泵机组、水泵、电动阀等设备的自动控制。上位机采用组态王King View6.53软件编程,通过RS-485/USB通讯方式与下位机实时通信,实现远程监控、历史数据查询和数据报表输出等功能。     

基于RS-485总线的温室远程监控系统

本文采用先进的计算机技术、微处理器控制技术和智能传感器数据采集技术,设计出温室远程监控系统。本系统由一台PC机与多个微处理器装置组成主从式分布结构:下位机采用性价比高的单片机,主要实现对温室环境参数的数据采集和控制工作;上位机采用PC机,主要用于对环境参数数据的管理和对控制参数的设置工作。系统采用半双工式RS-485总线型通信网络和累加校验通信算法进行数据传输。利用VB6.0开发出了交互的友好人机界面。通过实时读取和存储温室内环境参数值,实现了对温度、湿度两个温室环境参数的管理,方便查阅。     

高精度跟踪式水位测量仪的设计与实现

介绍了高精度跟踪式水位测量仪的工作原理、组成结构及设计实现。该测量仪采用Modbus通信协议,通过RS-485串行总线,可以单独或连网对各测量点的水位进行快速、实时的精确测量。分布在各测量点的水位测量仪(下位机)与PC机(上位机)组成非平衡主从式结构系统,上位机可以实现对多达140台下位机进行实时监控和数据信息的收集,系统最大通信距离可达1200m。     

基于GPRS网络的飞机除冰液加热监控系统

针对飞机除冰液加热,设计了一种基于GPRS(通用分组无线服务)网络的远程监控系统.它可以实现对设备的实时监控,及时有效地完成飞机地面除冰.该系统由上位机和下位机两部分组成:PLC作为下位机的控制系统,对执行机构进行控制输出,并且由A/D转换模块采集加热设备管道内的物理参数;远程控制中心作为上位机的监控系统,包括两种方式:一是利用数据服务中心作为远程控制中心,二是利用组态软件设计系统的操作界面作为远程控制中心.GPRS DTU(data transfer unit)通信模块通过GPRS网络完成与远程控制中心的无线通信,实现上位机与下位机之间的数据交互.     

基于RS-485网络的烧结炉集中监控系统

本文介绍了一个在WINDOWS环境下运行的烧结炉集中监控系统,详细叙述了下位机控制器的硬件结构,基于RS-485网络的通信方式及监控系统的软件设计实现。     

牵引变电所微机防误操作闭锁系统的研究

分析了传统微机防误闭锁的缺陷,设计了一套基于可编程控制器PLC的适合牵引变电所的微机防误闭锁系统,系统采用多台西门子S7-200进行电气量信号采集和操作闭锁执行功能,实现对现场电气设备的自动控制.上位机作为系统的控制和综合判断中心,起看"大脑"的作用,它利用RS-485通信线与PLC进行通信,并能与综合自动化系统进行信息共享和交换,实现现场设备的实时监控.     

中深孔岩心取样钻机供电系统电力参数的监测

针对取样钻机供电系统存在电力参数监测难、采集精度低的问题,提出了一种基于RS-485总线的智能监测系统。重点分析了上位机监控软件的构建和RS-232／RS-485接口转换器的设计,同时介绍了计算机与多功能网络电力仪表AOB192E-9T4的实时通信方式。测试结果表明,该系统具有运行稳定可靠、操作简单方便、响应速度快、抗干扰能力强、高精度等特点,大大简化了系统硬件电路。     

CAN-RS232转换器在实时操作系统RT-Thread上的实现

控制器局域网(CAN)通信的主要功能是实现其节点设备和上位机之间数据信息和控制信息的交互,CAN与PC机RS-232网络间的协议转换需要用转换器来完成.介绍了基于LPC1768处理器与RT-Thread系统的转换器的实现过程,完成了CAN与RS-232网路间的无缝通信.实践证明,此方案对CAN组网应用具有实际意义.     

压力机群控系统的设计

文章详细介绍了压力机群控系统的实现,主要任务包括了上位机监控软件的开发、硬件电路的设计和下位机的编程.系统上位机采用c++Builder6.0来进行监控程序的开发,压力机群整个网络采用RS-485的通信方式进行数据通信,控制板处理器选用集成了A/D和D/A的高性能增强型MCU-aduc841,并充分的考虑了电磁干扰与可靠性问题,同时下位机控制程序嵌入了嵌入式实时操作系统uC/OS-Ⅱ,以提高系统的实时性与可靠性.     

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     

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.