一种改进的移动IP分布式路由方案

提出了一种改进的移动IP分布式路由方案,通过对转向代理处缓存的组织结构及重传机制的改变,减少了乱序包和重传包,从而降低了远程信令流量,使移动IP网络的性能得到改善。     

基于光纤通信和PCI Express总线的高速图像传输系统

提出了一种基于光纤通信和PCI Express总线的高速图像传输系统。分析了系统设计方案,并详细阐述了FPGA内部逻辑设计,包括光纤接口的数据收发以及PCI Express总线的DMA传输;简要介绍了Windows WDM驱动程序及MFC应用程序的开发;给出了系统测试结果。该系统传输速率可达1.5Gb/s,且具有低成本、易扩展等优点,能够满足大多数高帧高清视频图像实时传输的要求。     

NI MXI—Express为PXI提供PCI Express控制

使用NI公司的MXI—Express工具包，通过PCI Express控制PXI和CompactPCI系统。作为PCI总线的发展，PCI Express是新一代PC I／O总线，并且对于大多数新的PC而言是一个标准的选择。PCI Express具备250MB／s每通道带宽，为高速和高通道应用提供吞吐量。MXI—Express是基于PCI Express技术，能为PXI系统提供高达110MB／s的实际带宽，相比通过MXI-4由PCI远程控制PXI，其性能提高40％。     

原生还是桥接——从两大图形芯片厂商看PCI Express总线

从ISA到PCI，从PCI到历代AGP，总线在不经意间慢慢地升级。然而比起CPU、GPU等技术的革新速度，总线的更新换代显然落后一步，甚至很大程度上成为了系统性能的主要瓶颈。为此，业界已经提出多项技术方案用于改变这个现状，而得到Intel、IBM、ATi等业界巨头支持的PCI Express无疑拥有十分美好的前景。面对已经勿庸置疑的PCI Express时代，nVIDIA与ATi采取了截然不同的态度。     

简谈PCI-E外部总线的应用PCI-Express设备的"越狱"计划

在过去的2006年里，笔记本电脑的销量占个人电脑销售总量的比例达到了前所未有的高度，而随着这一趋势的继续蔓延，笔记本电脑便携与性能不能两全的矛盾也就愈加的明显。在笔记本硬盘方面已经出现了传统硬盘与闪存技术相结合的混合型硬盘，在很大程度上弥补了笔记本硬盘在性能上的不足．而笔记本电脑的另一个软肋——显示性能的救世主谁来当呢？不久前PCI Express标准组织SIG发布的PCI Express External Cabling1．0标准（即PCI—Express外置总线标准）使我们看到了希望。     

研华推出PCI Express微型卡

研华公司推出带安全、智能Flash管理功能的PCI Express微型卡STG．PCIE系列。该系列Flash存储卡具有PCI Express1．1接口和较高的PCI Express（最高MB／s）传输速率，提供了一个性能优于现有IDE或SATA Flash存储器的引导装置。为保护客户的知识产权，     

简谈PCI-E外部总线的应用 Pcl-Express设备的“越狱”计划

在过去的2006年里，笔记本电脑的销量占个人电脑销售总量的比例达到了前所未有的高度，而随着这一趋势的继续蔓延，笔记本电脑便携与性能不能两全的矛盾也就愈加的明显。在笔记本硬盘方面已经出现了传统硬盘与闪存技术相结合的混合型硬盘，在很大程度上弥补了笔记本硬盘在性能上的不足．而笔记本电脑的另一个软肋——显示性能的救世主谁来当呢？不久前PCI Express标准组织SIG发布的PCI Express External Cabling1．0标准（即PCI—Express外置总线标准）使我们看到了希望。[编者按]     

基于PCI Express的高速数据传输系统研究与开发

为了解决高速数据采集系统中的数据传输速率这一瓶颈问题,在对PCI Express总线进行研究后,提出了一种基于PCI Express总线的高速数据传输系统的构建方法;系统设计中采用模块化的设计思想,探讨了PCI Express软件层的设计思路和实现方法,阐述了各个模块的功能,最后对编写PCI Express设备驱动程序的几个关键问题进行了论述并给出解决方案;采用以上设计方法,系统运行稳定可靠,目前已实现2.5Gbit/s的数据传输速率,对系统进行改进可获得5Gbit/s、10Gbit/s甚至更高的数据传输速率.     

移动IP分布式路由优化研究

IETF提出的移动IP协议对微移动的支持不够,而分布式路由方案能较好地解决该问题。该文在一种分布式移动IP方案的基础上进行了改进：将转向代理的缓存修改为循环列表,减少移动节点接收的乱序分组;当切换转向代理时,移动节点向前一个转向代理发送绑定更新消息,减少转向代理切换时的分组丢失;在转向代理处引入Snoop机制,减少通信对端重传分组数。利用NS2软件对两种方案进行了仿真。仿真结果表明,改进的方案能够明显地减少重传分组和乱序分组,进一步减少远程信令流量和数据流量,提高网络资源的利用率,有效地改善移动IP的性能。     

总线又革命：PCI ExPress迈向2.0时代

PC技术的革新总让人有点措手不及。我们刚用上PCI Express的主板．显卡不久．PCI—SIG这个标准制定组织就放出了PCI Express要升级到2.0的消息，PCI Express 2.0与之前的1.0相比有什么区别，升级至PCI Express 2.0究竟对用户有什么好处，PCI Express2.0是否完全兼容1.0，PCI Express 2.0的设备是否能插入1.0的插槽中，功能与性能上会有什么缺失，哪些方面的应用会需要PCI Express2.0这样的新规范……对此，本文将为你详细作答。[编者按]     

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.