一种基于光纤光栅压力传感阵列的飞机燃油液位测量方法研究

本文提出了一种基于光纤光栅压力传感器阵列的飞机燃油液位传感系统,研究了基于聚氨酯材料的压力敏感薄膜和光纤光栅压力传感器的制造工艺,通过光纤光栅(FBG)压力传感器阵列搭建了燃油液位传感系统,开展了液位传感实验。实验结果表明,该系统在75cm液位量程范围内可实现16.09pm/cm的测量灵敏度,最大相对误差<４％。论文提出的基于线性拟合曲线截距测量的液位高度计算方法,可以克服实际应用中测量液体密度和重力加速度变化对液位测量精度的影响,保证了系统的检测精度。该光纤光栅液位传感器为飞机燃油液位检测提供了一种新的技术思路。     

打印机几何误差分析与测量

在利用打印的网格图形获取书籍扫描图像的畸变参数时,网格图形的误差将影响所确定的畸变参数的精度,从而影响书籍扫描图像的畸变校正精度.为评价其影响程度,对打印机的几何误差进行了测量与分析.提出了一种基于图像处理的像素间距误差测量方法.通过编程,按照MM_TEXT映射模式打印图形,可消除打印时的量化误差.利用扫描仪对打印图形进行测量,在消除了扫描仪本身误差的影响之后,得到了较高精度的测量结果.实验研究了打印机像素间距误差与打印位置的关系.     

平板电容与光纤传输测量玻璃厚度系统

介绍一种新式的以平板电容传感器和光纤信号传输为核心的测量系统，该系统使信号快速得到精确处理，以保证玻璃厚度测量精度，从而减轻了体力劳动，提高了生产效率。     

光纤黑体空腔光电高温计的研制

光纤黑体空腔光电高温计的特点是在普通光电高温计前设置黑体空腔。前呈黑体空腔的精度是此类仪表的关键问题。在生产现场测量了两种类型在线黑体空腔的温度分布，计算了其有效发射率分布，并评价了上述肢体的精度等级。该光电高温计采用＊G－51系列单片机作为信息处理单元，结果表明，性能稳定可靠。     

图像处理在氧化铝回转窑温度测量中的应用

为了保证氧化铝生产的主要经济技术指标，对回转窑的烧成带温度测量精度提出了很高的要求，本文通过图像处理技术提出了一种温度测量方法，成功地解决了回转窑煅烧带温度测量的难题，并获得了很好的实际效果。     

基于图像处理的太阳光矢量倾角测量方法

为了提高在轨太阳光谱辐射的绝对定标精度,提出了太阳光矢量和太阳光谱仪主光轴夹角的测量方法。以图像处理技术为基础,构造了太阳光矢量和太阳光谱仪主光轴夹角的测量系统。入射的太阳光经在成像器件上成像,然后经过图像处理,获取了太阳光像点中心的位置,进而计算了太阳光矢量和与太阳光谱仪主光轴的倾角。实验表明测量方法是有效的,测量系统工作可靠稳定,测量精度约为0.05°。     

光纤黑体空腔光电高温计的研制

光纤黑体空腔光电高温计的特点是在普通光电高温计前设置黑体空腔。前置黑体空腔的精度是此类仪表的关键问题。在生产现场测量了两种类型在线黑体空腔的温度分布，计算了其有效发射率分布，并评价了上述腔体的精度等级。该光电高温计采用ＭＣＳ－５１系列单片机作为信息处理单元，结果表明，性能稳定可靠。     

基于图像处理的机器播种参数检测方法研究

为快速准确地检测机器播种性能,提出了一种基于图像处理的播种机播种性能检测方法.首先,通过信号触发,相机连续获取传送带上的种子图像,并将采集到的连续图像拼接成图像片段.运用大津法自动获取二值化图像阈值,通过阈值分割方法提取种子图像,并利用中值法对二值化图像中的种子数量进行清点.基于二值化图像的纵向、横向投影信息,得出种子阵列宽度、阵列中心、种子阵列间距、非种子间隔的坐标信息.基于以上测量参数计算出条播种、穴播种和精密播种性能相关参数.在某试验田进行实际应用测试,结果表明,该方法对机器播种性能的检测是可行的、有效的.     

光强调制式光纤传感器测量精度的研究

影响光强调制式光纤传感器测量精度的因素很多,对于所设计研制的用于叶轮泵高速转轴径向跳动测量的光纤传感器来说,合作对象所引起的测量误差比较突出。针对这一特点,对光在介质表面散射的特性和介质表面轮廓的分布函数进行了研究,并就其对测量结果的影响进行了仿真计算和分析,从而为该类传感器精度的进一步提高提供了依据。     

零件几何参数的计算机测量系统

介绍了一种利用视频测量、计算机图像处理技术实现的零件几何参数测量系统。该系统具有较高的测量效率 ,能够达到较高的测量精度。阐述了系统组成原理、图像处理算法以及影响系统测量精度的主要原因     

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.