基于LabWindows/CVI测控系统通用报表的设计与实现

为了弥补LabWindows/CVI开发环境中报表生成功能的局限性,结合实际工程,针对不同的报表需求,提出利用Activex技术调用MS Word和Excel实现报表设计的方法.通过运用此方法,在测控系统数据图表打印方面真正做到了所见即所得,在很短时间内便可按照用户要求自动生成图文并茂的通用数据报表,增强了报表生成的灵活性和通用性,提高了测试效率.     

LabWindows/CVI中Excel报表技术研究

在测控系统中,虚拟仪器是由模块化硬件配合软件组成的,具有较高的灵活性和扩充性,因此,广泛应用于测控领域.通常测控系统利用ActiveX输出数据报表,该方法较复杂,而虚拟仪器软件开放平台LabWindows/CVI简化了数据报表的输出.详细阐述了用LabWindows/CVI的excelreport.fp仪器驱动访问Microsoft Excel的方法,提出工程中常出现的报表格式相同而报表数不确定的解决方法,针对excelreport.fp仪器驱动不能复制的功能缺陷,提出了解决方法.并通过工程实例验证了该方法,说明其有很高的工程应用价值.     

基于LabWindows/CVI的单轴稳定平台测控系统

通过LabWindows/CVI多线程技术的工程应用实例,研究了线程之间数据高速传输的技术及方法,解决了通信中的数据阻塞问题.针对单轴稳定平台,设计了系统测控软件,该软件实现了数据采集、处理、存储、显示和报表生成等功能.实际应用表明该系统处理速度快、运行效率高,能够满足用户的要求.     

LabWindows/CVI与Matlab接口实现的几种方法

根据现代测控领域研究的需求,结合LabWindows/CVI和Matlab两种软件的优势,介绍了几种实现LabWindows/CVI与Matlab软接口的方法,并加以比较。     

基于LabWindows/CVI的高级应用开发技术探索

LabWindows/CVI是NI公司推出的基于ANSIC的虚拟仪器开发平台,通常作为一款测控软件开发环境被用户所熟知。除了作为测控软件,LabWindows还具有强大的应用软件开发功能。基于一款工作记录软件的开发,深入探索了LabWindows的高级开发技术,包括生成免安装软件、进程互斥、配置文件生成、界面美化以及Word文档插入排序等技术,对LabWindows高级应用开发研究具有重要意义。     

基于LabWindows/CVI的虚拟数字滤波器的设计与实现

LabWindows/CVI是测控领域最为流行的虚拟仪器软件开发平台之一。在概括分析了LabWindows/CVI语言的特点的基础上,介绍了一种基于CVI的虚拟数字滤波器的设计思路和基本方法,并给出了仿真运行结果,验证了其可行性和有效性。     

一种基于虚拟仪器的炼焦测控系统设计

简要介绍了测控系统的总体设计方案和基本的硬件配置结构,详细介绍了此系统在LabWindows/CVI开发环境下的软件设计方法和功能实现.     

故障诊断测试系统通用报表生成接口库的设计

针对故障诊断测试系统的测试结果报表生成操作复杂、效率低下、格式难以统一的问题,文章提出了一种新的报表生成方法;设计了测试数据保存的通用数据结构,利用基于ActiveX的LabWindows/CVI与Word、Excel之间的通信技术对报表文档进行操作,生成报表并对文档中的文字和图表进行格式设置,编写了数据保存和报表生成的功能接口并封装成动态链接库,形成了规范的报表生成方案;通过使用此方法,保证了测试和数据保存的实时性,实现了统一、美观的格式控制,大大简化了测试程序的开发。     

基于LabWindows/CVI的楼宇供水防泄漏自动测控系统的设计

针对智能楼宇供水管网的泄漏测控问题,提出了一种基于LabWindows/CVI虚拟仪器的新型测控系统设计方案;系统在结构上分为测控节点、楼层节点和中心节点三部分,基于ZigBee无线传感网络实现硬件互联;测控节点采用光电传感电路检测泄漏,发生泄漏时自动切断对应支路水源,并将报警信息经楼层节点发往管理中心,中心节点基于LabWindows/CVI虚拟仪器程序接收并处理数据,实现泄漏定位、示警及相关数据库操作;测试表明,系统的平均泄漏检出率达99.8％、判定准确率达99.9％,测控精度高、可靠性强,能够很好地满足智能楼宇供水泄漏的高精度自动测控需求、保障建筑楼体及内部财物免受漏水威胁.     

基于VXI技术的动静态参数测控系统的集成与开发

介绍了多参数综合测控系统开发的一个实例。系统以VXI仪器构建 ,并以专用测控软件开发平台LabWindows/CVI来开发 ,体现了虚拟仪器的思想。说明了利用软硬件结合对仪器功能进行扩展的一些方法     

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。     

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.     

Editorial: Special issue on recent advances in hybrid control theory and applications

正The demands of a rapidly advancing technology for faster and more accurate controllers have always had a strong influence on the progress of automatic control theory.In recent years control problems have been arising with increasing frequency in widely different areas,which cannot be addressed using conventional control techniques.The principal reason for this is the fact that a highly competitive economy is forcing systems to operate in regimes where     

Information for Authors

正Aim The Journals of Zhejiang University-SCIENCE(A/B/C)areedited by the international board of distinguished Chinese andforeign scientists,and are aimed to present the latest devel-opments and achievements in scientific research in China andoverseas to the world’s scientific circles,especially to stimulateand promote academic exchange between Chinese and for-eign scientists everywhere.     

Enhancing a leaf radiative transfer model to estimate concentrations and in vivo specific absorption coefficients of total carotenoids and chlorophylls a and b from single-needle reflectance and transmittance

The relative concentrations of different pigments within a leaf have significant physiological and spectral consequences. Photosynthesis, light use efficiency, mass and energy exchange, and stress response are dependent on relationships among an ensemble of pigments. This ensemble also determines the visible characteristics of a leaf, which can be measured remotely and used to quantify leaf biochemistry and structure. But current remote sensing approaches are limited in their ability to resolve individual pigments. This paper focuses on the incorporation of three pigments—chlorophyll a, chlorophyll b, and total carotenoids—into the LIBERTY leaf radiative transfer model to better understand relationships between leaf biochemical, biophysical, and spectral properties.Pinus ponderosa and Pinus jeffreyi needles were collected from three sites in the California Sierra Nevada. Hemispheric single-leaf visible reflectance and transmittance and concentrations of chlorophylls a and b and total carotenoids of fresh needles were measured. These data were input to the enhanced LIBERTY model to estimate optical and biochemical properties of pine needles. The enhanced model successfully estimated reflectance (RMSE = 0.0255, BIAS = 0.00477, RMS%E = 16.7%), had variable success estimating transmittance (RMSE = 0.0442, BIAS = 0.0294, RMS%E = 181%), and generated very good estimates of carotenoid concentrations (RMSE = 2.48 µg/cm², BIAS = 0.143 µg/cm², RMS%E = 20.4%), good estimates of chlorophyll a concentrations (RMSE = 10.7 µg/cm², BIAS = − 0.992 µg/cm², RMS%E = 21.1%), and fair estimates of chlorophyll b concentrations (RMSE = 7.49 µg/cm², BIAS = − 2.12 µg/cm², RMS%E = 43.7%). Overall root mean squared errors of reflectance, transmittance, and pigment concentration estimates were lower for the three-pigment model than for the single-pigment model. The algorithm to estimate three in vivo specific absorption coefficients is robust, although estimated values are distorted by inconsistencies in model biophysics. The capacity to invert the model from single-leaf reflectance and transmittance was added to the model so it could be coupled with vegetation canopy models to estimate canopy biochemistry from remotely sensed data.     

Mr. Twinn’s bombes

This article discusses the history and design of the special versions of the bombe key-finding machines used by Britain’s Government Code & Cypher School (GC&CS) during World War II to attack the Enigma traffic of the Abwehr (the German military intelligence service). These special bombes were based on the design of their more numerous counterparts used against the traffic of the German armed services, but differed from them in important ways that highlight the adaptability of the British bombe design, and the power and flexibility of the diagonal board. Also discussed are the changes in the Abwehr indicating system that drove the development of these machines, the ingenious ways in which they were used, and some related developments involving the bombes used by the U.S. Navy’s cryptanalytic unit (OP-20-G).