CF电子盘在嵌入式系统中的应用

文章在简述了基于PC／104的监测系统基础上，着重介绍了电子硬盘的种类、特点、基本结构和功能，并给出了CF电子盘在嵌入式系统中应用方法。     

SATA的速度魔咒——NCQ技术解析与测试

尽管硬盘的容量在不断地跨越一个个高峰，但其读写性能提升的步伐却跟不上CPU、显卡、内存等其它PC核心部件的发展。现在的PC硬盘仍然采用温切斯特(winchester)技术，早在1973年，温切斯特技术就已经应用在IBM3340硬盘上。由于硬盘属于机电(磁)一体化设备，在读写操作中存在着很多机械动作，机械动作速度的提升必然存在一个瓶颈，而到最后，机械部分的速度每提高一点点就要付出高昂的代价。     

机载电子盘设计

本文介绍了机载电子盘的硬件设计、调试和软件测试方法。该系统满足了机载航空图数据处理量大、吞吐率高、环境恶劣的环境要求，在嵌入式电子盘设计中具有典型性和实用性。内容充实，信息量大，工程实践性强。     

让硬盘“牛”起来——固态硬盘做系统盘的优化设置

电脑硬件的性能在不断地提高，但是操作系统和应用程序的启动速度却是越来越慢。难道是CPU性能不行？或者是内存带宽不够？其实，PC系统性能提升的瓶颈在硬盘上。十年来，硬盘的读取速度只提高了4倍多。而且更重要的一点是，由于机械硬盘的结构缺陷，随机读取时的性能往往只有连续读取的一半到三分之一左右，这也就难怪我们会觉得操作系统和大型应用程序启动速度越来越慢了。而固态硬盘的随机存取时间非常快，所以笔者才有了用固态硬盘取代传统硬盘作为系统盘的想法。     

硬盘的格式化与DOS系统的安装（上）

硬盘的格式化有两种形式:一种是对硬盘进行物理格式化(FORMAT);一种是对硬盘进行低级格式化。前者通常在对硬盘进行重新分区后进行,后者通常在下列情况下进行: 一是由于在运输、环境温度、清洁度等方面原因使硬盘内部发生机械定位误差; 二是病毒感染后,无法清除,造成死机,外设接不上,软件无法运行,速度变慢; 三是硬盘不能启动:做分区     

内存统一存储世界？闪存式硬盘首度接触

硬盘是我们电脑中必不可少的设备。它容量大、单位容量平均价格低、持续传输速度也不错，在存储世界里是绝对主流。不过，相对于电脑周边各种配件的高速发展，硬盘十多年来的性能提升相当缓慢。由于采用机械架构、依靠磁性存储介质，因此传统硬盘在寻道速度、抗震等性能指标方面始终难以获得突破。即使是处理器速度达到了接近4GHz，内存规格提升到了双通道DDR2800，由于硬盘始终是整个系统的瓶颈，用户在WindowsXP启动、游戏载入、应用程序启动、图片保存以及文件拷贝等常见应用时，始终无法非常明显地感受到处理器、内存速度成倍提升带来的高速反应。     

数字硬盘录像机拆机实测

嵌入式DVR在近年来国内DVR市场的占有率日益提高，很多工程商和用户在选择DVR产品时，也会把注意力更多的放在嵌入式DVR产品上。同时，生产厂商对于嵌入式DVR的明天，也是期待一片光明。本次我们将要为您拆几实没的是一款由Panasonic最新研发的WJ-HD88嵌入式数字硬盘录像机，下面就让我们看看它有何出色的表现吧。     

触摸海量存储的技术之光 最受关注的硬盘新技术分析

最近听到很多“终结硬盘”的消息，没错，在SSD硬盘兴起之后，传统的温彻斯特式机械硬盘地位受到了挑战，特别在硬盘的速度和存取性能方面，不过机械硬盘也不是一成不变的老古董，     

向120TB容量进军! 机械硬盘未来技术发展简析

目前很多人在购买电脑的时候已经不考虑机械硬盘了。诚然,相比S SD,机械硬盘在速度和性能上的确有很大差距,但是机械硬盘依旧有其存在的意义,那就是低廉的单位容量价格。市场上4TB的S SD价格最便宜的型号大约需要3000元,但是4T B的机械硬盘只需要大约500元。而如果同样花3000元,则可以买到约16TB的机械硬盘。相比之下,机械硬盘的单位价格只有固态硬盘的1/4。当然更值得注意的是,固态硬盘、机械硬盘都在不断提高容量并降低价格。在近期举办的希捷技术展会上,希捷就提出了120TB的硬盘的发展计划。那么如何才能做出容量高达120TB的机械硬盘呢?未来硬盘技术还可以有哪些突破?     

实用混搭Seagate Latop Thin SSHD

由于结构所限,机械硬盘（HD）在寻道时间、数据传输速率方面是无法与SSD（固态硬盘）相比的。自从SSD开始正式进入市场,在中高端笔记本电脑上SSD已经成了标准配置。任何一个使用过SSD硬盘的用户,在体验过系统、软件迅捷的启动速度之后,都很难再转回到机械硬盘平台。     

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.