弹光调制干涉信号放大滤波电路设计

从弹光调制干涉具中出来的干涉光经过探测器接收所输出的电信号频率很高且幅度只有几十毫伏左右,极易受到噪声干扰。有效地将其检测提取并放大至高速AD采集信号范围600 m V~4 V对弹光调制-傅里叶变换光谱仪的光谱反演至关重要。因此,需要设计一种高频、高增益、低噪声的两级放大电路。该电路主要由直流稳压电源电路、小信号放大电路和截止频率为50 MHz的低通无源滤波电路组成。实验结果表明,该放大滤波电路可以将弹光干涉信号平稳放大至150倍左右,能够为后续的采集存储提供良好的信号源。     

基于Miron NAND Flash的弹载数据记录器的设计

为解决传统以三星NAND Flash为基础的弹载数据记录器存储容量有限、存储速度难以提升的问题,以兼容ONFI2.2协议的MT29F32G08ABAAA为存储芯片,采用高效流水线操作以及无效块管理的逻辑设计,对芯片工作模式进行合理配置,设计了新一代数据记录器;介绍了该记录器的工作特性、能够满足特殊环境要求的硬件设计和基于高效流水线操作以及无效块管理的高速逻辑设计,最终实现了写入速度为56MB/s、存储容量为4G的高速大容量数据记录器。     

基于细菌视紫红质薄膜的三值光学数据存储研究

为了解决三值光计算机对线偏振光的直接存储问题,提出了一种基于细菌视紫红质薄膜的三值偏振全息数字光学存储方法.采用He-Ne激光器为记录和读出光源,以双层液晶和偏振器为核心的调制器为三值数据的输入部件、以双CCD为核心的解调器为数据读出部件 ,采用傅里叶变换全息记录的方法,在细菌视紫红质薄膜上实现三值数字光学数据存储.该方法具有以下特点:直接存储用光束的正交线偏振态和无光态表示的三值信息;以页面为单位的并行寻址和读写操作;高数据存储容量(存储面密度达2×108bit/cm2).     

基于离散傅里叶变换的多旋翼无人机循迹检测系统设计

传统多旋翼无人机循迹检测系统在循迹数据检测方面存在数据动态性强,变数大的问题,影响循迹检测整体效果。为此提出基于离散傅里叶变换的多旋翼无人机循迹检测系统设计;设计系统主要分为检测硬件与执行程序两部分,其中,检测硬件分别设计了数据传感器、数据采集模块、数据逻辑变阻器与信号分量控制器模块,通过各模块共同实现信号分量控制器调制输出;软件部分通过离散算法设计循迹数据离散处理程序,通过离散傅里叶变换对循迹数据传输通道内的回路进行闭环转换,设计循迹数据傅里叶变换输出程序,实现多旋翼无人机循迹检测系统设计;通过实验数据的对比表明,设计系统优化了多旋翼无人机循迹数据识别精度,能够有效提升系统整体循迹效率,具有实际应用性。     

傅里叶变换光谱仪动镜运动控制仿真

在傅里叶变换光谱仪中,动镜按一定规律进行往复运动。一般控制方案采用直线电机直接推动,但在体积小而高分辨率的傅里叶变换光谱仪中,直线电机要做得很长,不是很合适。采用无刷直流电机进行动镜控制;分析了无刷直流电机(BLDC)数学模型和动镜速度均匀性对光谱仪的影响,采用自适应在线遗传算法整定的PID控制和传统PID控制方法分别进行仿真控制,着重分析了带负载无刷直流电机的控制效果,并人工加入负载扰动。仿真结果验证了采用合适的控制策略控制无刷直流电机可达到傅里叶变换光谱仪对速度均匀性的要求。     

高速大容量固态存储器设计

为满足信息的高速大容量存储需求,提出基于闪存(FLASH)的固态存储器设计方法。介绍FLASH的结构、存储操作的实现方法和高速存储等相关技术。以通用串行总线和现场可编程门阵列(FPGA)可编程设计为基础,通过FPGA对多片FLASH的编程控制实现高速大容量存储。仿真结果证明,该方法能实现80 MB/s的数据记录速度和20 MB/s的数据回放速度,以及256 GB的存储容量。     

基于LabWindows/CⅥ的傅里叶变换光谱测量的数据采集系统

介绍一种基于LabWindows/CVI的光谱测量数据采集系统,利用LabWindows/CVI的编程优势,提高了编程效率与光谱仪数据分析的处理能力.给出了傅里叶变换光谱测量方法的设计原理、硬件系统构成以及LabWindows/CVI软件数据采集系统,包括实现干涉图数据采集、实时显示、数据分析处理和光谱分辨率的精确计算等功能.实验结果证明该系统满足设计需求.     

基于细菌视紫红质薄膜的三值光学数据存储研究

为了解决三值光计算机对线偏振光的直接存储问题,提出了一种基于细菌视紫红质薄膜的三值偏振全息数字光学存储方法。采用He-Ne激光器为记录和读出光源,以双层液晶和偏振器为核心的调制器为三值数据的输入部件、以双CCD为核心的解调器为数据读出部件,采用傅里叶变换全息记录的方法,在细菌视紫红质薄膜上实现三值数字光学数据存储。该方法具有以下特点：直接存储用光束的正交线偏振态和无光态表示的三值信息;以页面为单位的并行寻址和读写操作;高数据存储容量（存储面密度达2×10^8bit/cm^2）。     

DDR SDRAM在高速数据采集系统中的应用与设计

本文针对高速数据采集系统中数据存储容量的瓶颈，提出了一种基于DDR SDRAM的采样存储架构。文中详细阐述了DDR存储控制状态机的设计原理、方法，以及在采集系统中存储控制的时序设计，并绐出了设计仿真及实验结果。     

高分辨图像二维FFT正/反变换实时处理方法及硬件实现*

高精度密集型数值计算和大规模数据缓存,是高分辨率图像二维FFT(快速傅里叶变换)实时实现中的主要难点。利用实信号傅里叶变换的周期对称性和频域数据的共轭对称性,提出了一种高效且易于硬件实现的二维FFT正/反变换的实时处理方法,将实值图像二维FFT中的一维FFT计算和存储需求缩减了近一半。在以4片TS201为计算核心的DSP处理平台上,使用该方法实现了二维FFT正/反变换和图像频域滤波。实验表明,无须片外存储,单片TS201可处理最大512×512像素的图像;该尺寸图像的正/反变换总处理时间为49.6 ms,     

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。     

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。