光纤Bragg光栅传感网络实时监测与应变分析

作为一种绝对式传感器,波长调制式光纤Bragg光栅传感器对应变的响应为0.9pm/??。开发了基于可调谐F-P滤波器的检测仪器与计算机系统之间的实时监测系统。在对白泥井3号隧道的监测过程中,该光纤Bragg光栅传感网络实时监测系统实现了对来自隧道结构的应变状态的实时采集和描绘,并可以存储波长和应变数据以便后期查寻分析;借助分析光纤Bragg光栅传感器的应变图、三维应变图,为判断隧道二次衬砌的受力趋向提供参考。     

B/S模式的FBG信号远程监控系统设计

采用B/S结构作为监控系统的基本架构,开发了光纤Bragg光栅(FBG)远程监测系统.通过访问Web网络可以在浏览器界面查看FBG解调系统检测的FBG传感器数据.研究结果表明:通过查询2014年11月28日～2014年12月27日期间应变桩FBG应变传感器应变变化的时序曲线图与边坡上表面FBG位移传感器位移变化的时序曲线图,能够及时了解到不同监测对象的物理变化量.通过远程实时观察传感器数据信息,为工程的安全监测提供了依据.     

用于油库监测的光纤Bragg光栅传感器实验研究

通过对三种光纤Bragg光栅传感器的实验研究,得出实验数据并进行分析,表明光纤光栅传感器用于油库状态参数监测是可行的。该文介绍了分布式监测技术领域的一种新型技术——光纤Bragg光栅监测网络技术,指出了其相对传统技术所具有的独特优越性。最后,提出了一种基于光纤Bragg光栅传感技术的油库监测网络。     

煤矿用光纤Bragg光栅火灾探测系统研究

采用特殊合金材料封装制作了光纤Bragg光栅火灾探测器,温度传感实验表明,该火灾探测器的温度灵敏度是裸光栅的1.755倍,实现了温度的增敏;应用该火灾探测器与光纤光栅波长解调仪、数据传输和控制总线、数据控制中心等设计了煤矿用光纤Bragg光栅火灾探测系统,该系统采用光纤光栅波长解调仪对由现场感温光栅反射回的光信号进行波长解调并测试波长的变化率,通过该波长变化率获知是否发生火灾。实验表明,该系统具有较高的火灾探测准确率,并能缩短报警时间。     

基于B/S结构的网络异常数据实时监测方法研究

针对传统技术中采用C/S结构存在的不足,提出了基于B/S结构(Brower/Server,浏览器/服务器)的监测方法,并构建出远程、实时、在线异常数据实时监测系统.该系统包括数据层、传输层、应用层、表示层和远程用户监控中心,通过Internet网络下载Web浏览器,在IE网站登录远程监控管理网站,实现远程操作界面的数据通讯,并通过网页上下载带有WinSocket的ActiveX控件,建立起数据通讯.还设计出基于S3C44B0处理器的远程监控终端硬件结构,采用网络数据过滤算法,降低数据包传递量,以提高网络运行数据的精度.实验表明,本方案在数据传输的实时性上优于C/S结构,大大减轻了网络数据传输负荷量.     

光纤Bragg光栅传感器高速冲击试验研究

光纤Bragg光栅是一种性能优良的敏感元件,光纤Bragg光栅传感器在很多领域得到了应用.通过霍普金森压杆上的冲击试验研究了光纤光栅的动态响应能力.试验表明Bragg光栅能够正确响应不同频率的冲击信号,解调仪能够正确并快速解调出高速动态激励信号,同时Bragg光栅在受拉和受压时以及动态和静态灵敏度基本一致.光纤光栅传感器能够应用于武器侵彻爆炸等强冲击、恶劣环境下动态应力应变的测试.     

结构健康监测用光纤Bragg光栅温度补偿研究

阐述了光纤Bragg光栅及多光栅温度补偿法基本原理,推导出温度补偿公式。在光纤Bragg光栅应变灵敏系数标定及钢架静力试验过程中进行温度补偿,试验结果显示光纤Bragg光栅温度计能够准确测量温度干扰。     

基于光纤Bragg光栅应变传感器的量测锚杆拉力研究

由于被锚固结构自身的风化作用和锚杆自身的受力,蠕动变形等会改变锚杆的受力状态。为了实时反映锚杆的受力状态,将光纤Bragg光栅应变传感器通过引脚沿轴向焊接在锚杆的杆体上。由于锚杆杆体受力带动光纤Bragg光栅应变传感器引脚间距发生变化,使得应变传感器内的光纤Bragg光栅中心波长发生移位。通过对光纤Bragg光栅中心波长移位量的测量,可以实现对锚杆轴向拉力的在线监测。锚杆拉力试验表明:拉力灵敏度为6.5 pm/kN,线性度为1.78%FS。     

基于FBG磁场传感方案的研究

光纤Bragg光栅(FBG)传感技术较其它光纤传感技术有独特的优点,因此更具有研究的价值.本文基于光纤Bragg光栅的应变敏感性和磁性材料的磁致伸缩效应,提出了将光纤Bragg光栅应用于磁场传感测量的方案,并论证了其可行性.     

基于单片机的光纤光栅解调器

Bragg光栅解调系统是光栅传感器得以实用化的关键。根据光纤Bragg光栅传感器的传感机理,介绍了Bragg光栅解调系统的工作原理,建立了解调系统模型,提出了实现Bragg光栅解调的单片机解调系统,给出了详细的软硬件设计方案。光栅解调系统测量能够精度达到±5pm,重复性最大误差为±8pm。     

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。