PTCR油井注入液体流速检测系统

介绍了由井下PTCR热散式流速传感器和井口单片机数据采集系统组成的油井注入液体流速检测系统。解决了井下高粘度、低流速流体测量的问题。     

埋地管道阴极保护监测系统的研究及应用

针对人工巡查埋地管道阴极保护数据的不足,设计了一种埋地管道阴极保护远程监测系统.整个系统由数据采集终端、通信网络及监控中心构成.数据采集终端基于STC12C5608AD单片机和GPRS技术,实现埋地管道阴极保护数据的在线测量和信息的传输.监控中心的软件部分基于力控组态软件实现,完成阴极保护数据的接收、保存、管理和计算机辅助分析.整套监测系统已成功应用于某石化企业,运行结果表明该系统实时性好、可靠性高,为埋地管道阴极保护的监测提供了理论参考和实践经验.     

微波自动测量系统的研究

文中介绍了微波自动测量系统的主要功能、特点.该系统采用计算机辅助测试(CAT)的方法对传统的微波测量线进行智能化、自动化和数字化改进,使之成为由PC机控制、数据采集、数据处理、过程和结果显示的微波CAT系统.该系统由测量线、步进电机、PC机、单片机和有关硬件组成,并在软件支持下工作.利用VisualC++6.0来设计控制程序.具有图文并茂、快速稳定、精度较高等特点.     

膏体推进剂变截面管道流动的数值仿真

应用Ostwald幂律本构关系.分析了膏体推进剂在收缩管道内的稳态流动特性,获得了管内的流速、压力的分布.以收缩角θ(半锥角)为对象.研究了收缩角对流场的影响,得到了单位长度管道压力差与收缩角的关系.根据仿真结果发现,收缩角对压力分布影响较大,在管道渐变处,收缩角越大,压力分布越复杂.而收缩角对流场速度分布影响不大.收缩角对输送能量损耗影响很小,在设计膏体推进剂输送功率时可以忽略这一参数,将收缩过渡段当成细管道计算,处理是安全的.为了避免膏体推进剂流动时产生"死区",应该采用小收缩角管道.     

基于CPLD的航姿数据采集器设计

提出了一种针对微小型无人直升机航姿测量系统的航姿数据采集方法,设计了以复杂可缟程逻辑器件(CPLD)为核心的航姿数据采集器.该采集器由CPLD和ADC器件组成,通过SPI模块与ADC控制模块来实现对数据的采集,通过数据FIFO和通讯模块完成与航姿计算机的数据交换.     

基于电容传感器的塑膜厚度检测系统的研究

采用非接触式电容传感器、电涡流传感器组合系统获取检测信号,利用基于LabVIEW软件平台的计算机实现对塑料薄膜进行在线检测的工作原理,整个系统由测试单元、电机驱动单元、数据采集与处理单元组成.由于测试单元采用了电容、电涡流组合传感系统,信号的后续处理由基于LabVIEW软件平台的计算机自动完成,加速了测量过程.采用本系统取代传统的千分尺测量方法,可以使塑料薄膜厚度测量以完全智能的、实时的、非接触的方式进行精确测量.最后,通过比较组合测量系统与千分尺测量的测试结果,证明了该系统具有较高的精度,良好的可靠性与可行性.     

基于Java的车轮不圆度数据采集分析系统设计

为了实现车轮不圆度激光测量仪与计算机串口之间的数据通信,实现实时显示测试数据和对数据的后处理分析,论文设计了一套基于Java的车轮不圆度数据采集分析系统;该系统由系统界面、数据采集、数据显示、数据分析等模块组成;实现了车轮不圆度测量数据与计算机串口之间的动态采集、显示、分析处理、存储等功能;现场测试结果表明:系统各功能模块运行稳定,能动态测量并显示车轮踏面圆周的非圆化磨损情况;所设计的数据采集分析系统具有友好的人机交互界面,具备实时性、可靠性、安全性特点。     

基于单片机的缺水微弱电位监控系统设计

本文从实验角度摸索出适合测量植物电信号的放大电路,微弱信号放大电路,建立了植物水分情况变化时电信号监测系统,整个系统由测量放大电路、A/D转换电路、单片机、MAX232、计算机组成.用C-51语言实现单片机数据采集、报警、键盘显示.     

微惯性测量组合系统的设计

介绍了一种微惯性测量组合(MIMU)系统的设计方法。该系统由电源模块、数据采集模块和数据处理模块组成。数据采集模块用16位高精度AD和浮点放大器采集MIMU输出信号;数据处理模块采用高速单片机和嵌入式计算机进行数据处理。还介绍了数据采集的软件设计。该系统结构简单,为捷联系统的小型化提供了一种新的思路。经实际应用表明:该系统合理可行。     

基于多线程的USB接口流速测量系统

设计基于USB接口的流速测量系统.硬件上使用USB接口芯片实现采集设备与计算机的实时通讯,提供简洁易用的操作接口;软件方面,在Visuall Basic6.0开发环境下,运用多线程技术解决实时数据采集和图形显示等问题.经测试和实际运行表明,系统已达到流速测量预定的技术指标,具有良好的实时性和可靠性.     

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。     

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.     

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     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

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.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.