多窗口编码激光预警系统设计与性能分析

为了在激光告警中实现实时、全方位角度探测,且在探测角精度确定的前提下使结构简单、稳定,提出了基于多窗口编码的光纤天线的测量方法.该方法是通过在不同方向上放置特制的大视场光纤接收端口,再将各个方向的光纤耦合到PIN探测器阵列上,通过探测电路分析得到激光入射方向.在实验室条件下,利用衰减后的窄脉冲激光器测试光纤接收角与接收电路.实验表明:光纤接收端的接收角在偏移±30°时信号强度衰减为0°入射的-3 dB.电路峰值保持电路的精度优于2%.本电路适用于探测1 mW/cm2微弱窄脉冲激光,探测虚警率为0.15%,满足激光预警系统设计的要求.     

点阵激光美容仪温度探测自动告警系统

当前告警系统通过设计告警驱动模块电路,运行告警驱动模块时,容易出现误报和漏报问题,提出点阵激光美容仪温度探测自动告警系统。硬件方面,确定点阵激光美容仪温度探测自动告警系统组成,构建系统硬件框架;选择符合ITU-TRS232标准的CMOS电平负责告警系统的串行异步收发,设计通信电路,通过符合TIA/EIA-323-F标准的MAX3238芯片,实现CMOS电平转换和TC35i数据接口通信。软件方面,计算系统时钟能适应的最大干扰源,设计告警驱动模块运行时序;设定温度阈值程序、通信总线程序和系统运行主程序,实现点阵激光美容仪温度探测自动告警。确定实验装置结构、技术参数和设计实验案例,实验结果：设计系统相较此次实验选择的两组系统,温度随之时间不变化而发生较大变化,设计系统准确监测温度,并且不存在告警误报和漏报次数,有效提高了告警系统的准确性。     

基于模糊神经网络的火灾探测系统研究

为降低火灾报警误报、漏报频率,根据火灾探测特点,提出了基于模糊神经网络的火灾探测系统设计方案,介绍了基于模糊神经网络的火灾探测系统组成、模糊神经网络的设计与应用等。该系统可对传感器探测到的信息进行智能化处理,明显提高了火灾探测的灵活性和准确性。仿真结果证明了该方法的可行性。     

“降低误报要从产品管理、安装管理和防区管理入手”

降低误报必须从报警联网建设管理各个环节上着手。从技术的角度来说，目前的被动红外、微液，加上微处理器是比较成熟可靠的探测技术，采用多重鉴证复合式探测器，是现行比较有效的抗误报技术手段。之外，误报问题与人的因素密切相关，所以从管理方面着手，防止，减少误报，更具有积极、根本的意义。     

实现恒压检测电路设计

本电路应用在人体脉搏检测系统,主要设计恒压电路、脉搏探测电路、信号调整电路、控制单元以及USB接口电路。     

差动电桥电路在传感器测量中的应用

本文介绍了电桥电路的工作原理.分析比较了单臂电桥和差动电桥的特点,得出了检测电路中差动电桥的应用是比较普遍的.     

基于Multisim的差动放大电路典型应用特性研究

差动放大电路通常作为集成运算放大器的输入级,以及变跨导型模拟乘法器的基本组成形式,是模拟电路中的重要单元电路,研究其典型应用特性对于模拟电路设计具有重要的意义。本文主要研究带恒流源的差动放大电路对差模信号的放大作用和共模信号的抑制作用,以及变跨导型差动放大电路对音频信号的幅度调制作用。介绍如何调节电路参数以达到设计要求。比较理论估算值与基于Multisim12的仿真测试结果,研究误差产生的原因。     

视频窗口控制器设计

在描述了多媒体窗口控制器的基础上,介绍了用 ＦＰＧＡ实现的电子内窥镜中窗口控制器的设计原理及电路。该方法可灵活改变设置,广泛用于多媒体硬件电路的设计之中。     

“三用”差动式电路

我们用晶体三极管作传感元件,设计“三用”差动电路,作为温控和光控开关。介绍如下:一、差动式温控电路(图1)图中 BG_3作为热敏元件,把其 e、c 两极接在差动放大器中的偏置同路中。BG_3     

一种差动电容式加速度传感器设计的理论研究

设计了一种差动式测振传感器,建立了差动电容式加速度传感器的数学模型,并通过电容的推导计算对其进行了特性分析。对检测电路的结构进行了分析,给出了典型电路结构,推到了电路参数及性能;本设计具有电路结构简单,频率范围宽约0～500Hz,线性度小于1%,灵敏度高,输出稳定,测量误差小等优点;通过实验,各项性能指标满足设计要求。     

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.