弹载三轴加速度测试及其可靠性研究

针对恶劣环境下的弹丸加速度信号测试,设计了一种基于动态存储测试技术的弹载高g值三轴加速度测试系统,给出了系统原理图和硬件电路流程图。介绍了系统组成及关键技术,这些关键技术为系统在恶劣的测试环境中能准确测得实验数据提供了保障。通过失效机理分析,运用可靠性框图法,建立系统的可靠性模型,对测试系统各个部件进行故障分析,分析弹载三轴加速度测试系统的可靠度,使用试验总结数据估算算出测试系统的可靠度,最后提出可以提高系统可靠性的改进措施。     

一种飞行试验测试系统设计

介绍了一种飞行试验测试系统的工作原理和软硬件设计方法,该系统主要由压力传感器、加速度传感器、基于PC104总线的数据采集系统、电源控制电路、数据输出设备组成,通过试验证明,该测试系统运行可靠,而且具有很好的抗冲击性和稳定性,为研究提供了充分准确的依据.     

基于CPLD的三维微型加速度存储测试系统

由于某些武器内部附加因素产生的微小加速度可能会影响到武器的精度、可靠性等,因此通过内置测试系统来准确检测该微小加速度并尽量进行改善是相当重要的.而武器内置测试系统预留空间小,环境相当恶劣.为了提高系统的可靠性及使用灵活性,本文提出了一种基于复杂可编程逻辑器件的三维微型加速度存储测试系统,并重点阐述了系统所具有的关键技术.该系统具有体积小、灵敏度高且能抗高过载等优点,在多次实际试验中得到了良好的应用.     

基于加速度传感器的井下电机车实时定位系统

针对目前煤矿井下电机车精确定位技术并不成熟的问题,提出了一种基于加速度传感器的电机车实时定位系统,该系统以电机车自身信息与调度信息相结合为基础,阐述了定位原理和具体实现方案,分析了实现此系统的三项关键技术：判断行车方向准确、加速度传感器计算位移准确、无线传输误码率低,并通过设计、改进相关算法解决了关键技术问题。此外,仿真实验与测试实验证明了系统的可行性。     

新型数据手套及其手势识别研究

在人机交互系统中,为了准确获取手部的运动信息,设计了一种基于微机电系统MEMS加速度传感器的新型数据手套.该数据手套以MXR9500传感器和SPCE061A单片机为核心元件,通过检测加速度传感器的三轴加速度来获取手势动作的空间三维信息和手指的运动信息.以该数据手套为基础开发的汉语手指语拼音字母识别系统,采用基于模糊理论的识别算法,进一步提高了识别准确率.测试结果表明手套测量数据准确,识别系统准确率高、运行稳定.     

弹底压力测试中压力传感器的加速度效应及其校准方法

针对弹底压力测试中压力传感器同时受到高加速度的影响,提出了一种压力传感器加速度效应的校准方法.该校准方法通过对压力传感器施加系列不同的压力并采用霍普金森杆产生对应的不同系列激励加速度脉冲,从而测得该压力传感器不同系列激励的加速度效应.通过ANSYS有限元仿真和校准实验对加速度效应的验证,从理论分析和实验数据都证实了压力...     

基于ADXL202的语音播报电子倾斜测量仪设计

介绍一种基于MEMS双轴加速度测量芯片ADXL202和科大讯飞TTS语音模块的语音电子倾斜测量仪.利用单片机系统接收加速度模块给出的重力加速度测量值,经转换为倾斜度测量值后,通过LCD及TTS语音模块显示或播报所测得的倾斜度数据.文中给出了系统的详细硬件设计方案及主要软件流程图.该测量仪结构简单,工作稳定,操作便利,反应速度快并具有智能语音播报功能.     

基于MMA7260的人员脚步声采集系统设计

设计了一种人员脚步声采集系统,该系统以STM32微控制器为核心,采用三分量加速度传感器MMA7260采集人员的脚步声信号.在与上位机的通信过程中,STM32采用无线发射模块或者串口向上位机发送数据,上位机在接收到数据后将上传的数据转换成模拟波形.大量实验数据表明,该系统能够准确地采集到人员的脚步声信号,为后续的人员脚步声的特征提取及多人脚步声信号分离提供了准确的原始数据.     

振动压路机压实度检测系统设计

为提高公路建设质量和效率,提出了一种基于宝马格方式的振动压路机压实度检测系统。根据所测得的加速度、温度等信息对压实度进行评价,使用GPS技术将具体位置与压实信息相对应,并通过液晶屏进行直观显示。实现了压实信息及其相关数据的本地及远程存储,便于事后分析。该系统工作稳定可靠,为压实作业提供了参考,提高了压实作业效率。     

基于K型热电偶的瞬态测温技术的研究

针对导弹环境瞬态温度测试系统的特定要求及现有存储测试系统存在的测试精度低、可靠性差、成本高等问题,本文论证并设计了基于K型热电偶的动态存储测试系统。文章介绍了系统组成,并对测试系统的可行性进行了论证,提出了热电偶动静态校准的关键技术。该技术为环境温度的测量提供了重要的保障,用实测的数据对系统进行动静态校准,分析得出相关结论。研究表明:该测试系统具有实际工程使用价值,可为分析导弹环境温度提供一种快速的、有效的、精确的测试手段。     

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.