分布式柴油发电机组测试系统

为了在发电机组保养维护后进行功能和性能测试,保证维修的质量,设计了一种分布式柴油发电机组测试系统,其智能参数采集单元可测试发电机组运行时的各种参数,通过CAN总线网络完成采集、控制信号的传输和数据的交换;介绍了基于CAN网络的分布式测控技术的柴油发电机组测试系统原理、组成结构、运行加载,闸述了其软硬件组成、作用与特点;发电机组在运行过程中,其高压、大电流等会产生电磁干扰,对信号采集传输以及故障判断等造成影响,故系统采用了一系列的抗电磁干扰措施,经过运行实践,证明系统能很好地解决柴油发电机组调试、测试中的电磁干扰问题.     

转发式北斗导航卫星信号性能评估的研究与实现

北斗一代在使用过程中存在隐蔽性不良,定位实时性差等问题,为了实现北斗导航信号的性能评估,相对于以往的硬件形式,如硬件接收机、频谱分析仪、矢量网络分析仪等,提出了以软件接收机的方法对北斗导航信号进行性能评估;首先分析了转发式北斗导航信号评估的意义、内容与方法,并采用软件接收机的形式进行评估;然后研究了转发式北斗导航的信号性能评估关键技术,给出了捕获、跟踪、评估参数计算的程序流程;最后根据实测数据在Linux高性能集群系统上进行了测试验证,实现了北斗导航信号的捕获、跟踪以及评估中的评估参数计算;测试结果表明,文章中的设计方法可实现北斗导航信号性能的评估,效果良好,评估内容、指标易于调整,便于软件算法参数的测试、升级,可为后续的卫星导航信号评估以及算法测试等提供了一定的依据。     

基于软件接收机的卫星导航信号模拟器性能指标测试

针对卫星导航信号模拟器的性能指标测试评估问题,提出了基于软件接收机的性能指标测试方法;通过分析模拟器性能,包括对动态性能、相位噪声、通道间时延一致性和静态定位精度的综合分析,给出了相应的测试方法和测试流程,并结合卫星导航信号模拟器产生的实际信号对各项性能指标的测试结果进行分析;经测试结果表明,软件接收机可以有效地对卫星导航信号模拟器各项性能指标进行测试,测试结果符合理论预期,满足模拟器性能指标测试评估的需求。     

软件性能测试策略分析与实践——以湖南农村信息化综合服务平台为例

本文以湖南农村信息化综合服务平台为具体案例,阐述了软件性能测试方面的相关概念,给出了一套具体可行的软件性能测试方案,重点描述了软件性能测试的基本过程并对软件性能测试策略进行深入剖析与详细评估。     

CMOS图像传感器参数自动化测试软件设计与实现

针对光学遥感系统图像传感器性能评估需求,搭建了一套图像传感器参数测试系统。测试系统中的参数自动化测试软件实现了图像传感器图像数据的实时采集、存储和显示;对图像传感器的主要性能参数进行实时计算分析,测试结果实时显示存储。该测试软件在DALSA公司Sapera LT 软件开发包的基础上,利用VC++进行二次开发,实现了参数测试的自动化。根据测试结果,验证了测试方法的正确性。软件设计过程中注意了模块化、规范化设计,所以软件的移植性较好,具有良好的应用前景。     

参数依赖型软件参数更动测试策略和方法

参数依赖型软件是指初始化时读取并解析配置参数,并据此进行任务处理的软件,航天测控软件是典型的参数依赖型软件;航天测控软件具有明显的领域软件特征,多采用领域工程分析技术,实现业务处理逻辑和具体任务参数的分离,达到仅通过修改任务配置参数而适应高强度型号任务的目的;通过对参数依赖型软件架构、应用模式的分析,提出一种对参数依赖特性进行验收测试、参数更动测试的流程、策略和方法;并基于该方法,对远程数据交互软件进行了参数依赖特性测试,测试结果表明,该方法具有测试覆盖性强、测试重点突出、测试效率高的特点。     

LabVIEW软件在储氢材料性能测试装置的泄漏率评价中的应用

储氢材料性能测试主要包括PCT曲线和动力学曲线的测试,一般采用基于容量法原理的测试装置完成。由于测试方法决定测试结果对氢气泄漏非常敏感,因此在进行相关测试之前有必要对系统的泄漏率进行评估。为了使泄漏率评估过程更加科学、规范、可靠、具有效率,本文对有关泄漏率的测试原理,流程和关键要点进行了系统介绍,详细阐述了如何通过Lab VIEW软件编程实现泄漏率自动测试程序,其中包括阀门控制、数据采集和存储、被测腔体氢气摩尔量变化曲线和泄漏率数据的实时输出以及Excel报表自动生成的功能。实验研究结果表明:该泄漏率测试程序能够满足此类系统的测试需求,所搭建的测试系统密封良好可用于储氢材料性能测试。     

基于故障确认的一体化测试性试验验证平台

针对目前测试性试验中缺乏有效的试验验证平台的现状, 创新性地提出了基于故障确认的一体化平台,具备装备功能性能测试、故障注入、测试性评估等功能。通过对测试性试验验证流程及步骤的论述,结合直接故障注入、等效故障注入、实际故障统计、测试性仿真分析等进行测试性综合评估,对一体化平台的硬件组成和软件框架进行了详细论述。最终将一体化平台应用于某型相控阵雷达的测试性评估试验,具有很强的工程推广价值。     

基于USRP的无线触发系统设计

早期的分布式测试系统多是采用基于硬件连接线的触发方式,优点在于安全性高、速度快,适用于各节点设备较为集中的测试系统;为了使分布式测试系统不受制于线缆,同时又能够对范围更大、位置更分散的对象进行测试,提出了使用无线链路实现触发功能的系统方案,设计了一条无线传输链路,包含了从指令信息产生到指令信息接收整个链路中的各个模块,可以支持两种不同的触发模式——定时触发与随机触发,可以实现"一对一"以及"一对所有"场景的信息传输;通过使用基于USRP+LabVIEW的软件无线电对所提系统进行了功能测试与性能评估;功能测试结果表明,该方案可以顺利实现定时触发与随机触发模式下"一对一"和"一对所有"的信息指令传递;性能评估以时延作为评估指标,评估结果表明,在所使用的USRP+ Lab-VIEW的软件无线电条件下,全链路时延为毫秒级,具体数值由链路参数决定.     

基于Modbus的发电机组监控软件设计

目前,发电机组多采用控制器作为监控设备,针对控制器在监控过程中操作繁琐、读取数据单一、屏幕显示不友好等问题,提出了一种通过操作上位机软件控制发电机组的策略。以Modbus作为通信协议,利用可视化开发环境Visual Basic 6.0作为开发工具,设计了发电机组监控软件。对监控要求、软件的整体设计方案、体系结构以及各部分功能的实现进行了详细阐述。结果表明,该软件能够实时、动态、准确地显示发电机组的各类参数,同时也可以向发电机组发出请求,从而控制发电机组。监控软件在节省成本、操控方法、界面显示、维修维护方面有很大优势,而且通过数据库可以实现随时读写和存储数据的功能。     

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。