图形超级计算机的可编程HIPPI接口

随着网络接近Ｇｂ／ｓ的性能，超级计算机的主机接口正在成为通讯的瓶颈。为图形级计算机ＰｉｘｅｌＰｌａｎｅｓ５设计的高性能主机接口—网络接口部件（ＮＩＵ），通过数据调度硬件与嵌入式处理器之间的平衡取得了高性能和可编程性。本文对ＮＩＵ的硬件、软件、固件及接口性能进行了分析和总结。     

并行机群通信层与TCP／IP网络接口的方法研究

并行机群是一套硬件，软件集成的并行程序开发和运行环境，为了增强该系统的开放性，兼容性，可移植性，需要实现该系统通信层与ＴＣＰ／ＩＰ网络的接口，本文按问题的提出，分析，解决思路，对此实现方法进行探讨。所讨论了问题集中在ＴＣＰ／ＩＰ协议层次模型的网络接口层上，本文不仅对并行机群与ＴＣＰ／ＩＰ网络的接口实现，而且对其它专用多机系统与通用网络的接口的实现，都有重要的参考价值。     

消息存储器网络接口设计在PCI总线上的实践与性能分析

根据研究结果表明,在网络并行计算系统中,消息传递的内容很少是栈（Sdtack)中的数据,而主要是堆（Heap)中的数据,根据这个定性分析以及定量统计结论,结合存储器技术的进展,在网络并行计算中的网络接口上引入消息存储器,使得网络并行计算中各个结点可以直接访问其他结点的消息存储器,本文给出在这种消息存储器网络接口在PCI总线中的实践,对比了采用完全ASIC设计的通用原始方案与在PCI总线上采用嵌入处理机的方案之间的差异,根据对比结果,得出采用嵌入处理机的方案可以在完成面样功能的情况下,获得更高的计算与通信的重叠性,所以本文修改了原始的MMNI设计方案,把消息队列的管理也交由嵌入处理机完成,最后本文给出一种性能分析的模型,给出了在PCI总线上消息存储器网络接口的具体性能数据。     

Win95下利用串口进行的网络编程

本文论述了在Ｗｉｎ９５环境下基于ＴＣＰ／ＩＰ协议的Ｗｉｎｓｏｃｋ编程技巧，分析了串行编程的具体实现以及网络接口扩展，并介绍了实现串行通信口接入ＴＣＰ／ＩＰ网络的方法。     

高性能计算机系统接口通信机制的研究

高性能并行计算机技术是当今关键技术之一,由清华大学计算机系设计的高性能网络并行超级计算系统THNPSC－1在设计接口时,通过一个表对通信缓冲区进行维护,这样可以直接将数据从应用空间输入／输出到网络,从而支持真正意义上的0拷贝通信协议。通过提供用户层网络访问接口,通信与计算重叠等手段,该接口取得了很高的通信性能。其中实际测量的应用程序之间16字节信息的传递延迟不到7us,最大持续通信带宽可达30MBytes/s。     

网络家电系统的嵌入式接口设计

根据网络家电的特点和要求，采用DSSOCA00网络微控制器设计了网络家电系统的嵌入式接口模块，描述了系统的体系结构及其组成，阐明了嵌入式网络接口模块的硬件设计。远程用户使用该系统可以通过Internet与DS80C400进行通信，实现对家电的远程监控。     

NoC资源网络接口设计

资源网络接口是片上网络处理单元向路由节点发送数据的一个通信接口,负责把处理单元发送的数据打包成路由节点所识别的数据。针对该接口高速传输要求,采用请求、应答通信机制方式设计一个资源网络接口。该接口内各模块间通信,以及该接口与处理单元和路由节点间通信均采用异步通信。接口内的打包器采用奇偶格式设计,缓存模块采用时分复用的思想以降低读、写过程延迟。用Verilog HDL语言完成该接口设计,在ModelSim10. 01d平台上验证,最终验证结果表明:设计的资源网络接口能够把处理单元发送来的数据打包成路由节点所识别的数据,且满足高速率数据传输要求。     

在Windows NT环境下实现实时可靠的数据通信

论述了在ＷｉｎｄｏｗｓＮＴ环境下基于ＴＣＰ／ＩＰ协议进行实时可靠的数据通信的实现方法,且介绍了采用Ｗｉｎｓｏｃｋ为网络接口,开发Ｃｌｉｅｎｔ／Ｓｅｒｖｅｒ模型的网络通信模块的编程技术。     

在Windows NT环境下实现时可靠的数据通信

论述了在Ｗｉｎｄｏｗｓ ＮＴ环境下基于ＴＣＰ／ＩＰ协议进行实时可靠的数据通信的实现方法,且介绍了采用Ｗｉｎｓｏｃｋ为网络接口,开发Ｃｌｉｅｎｔ／Ｓｅｒｖｅｒ模型的网络通信模块的编程技术。     

宽带接入技术的新发展

接入网（Ａｃｃｅｓｓ Ｎｅｔｗｏｒｋ,ＡＮ）是国际上近年提出 的一种新概念,它包含用户线传输系统、复用设备、数字交叉连接设备和用户／网络接口设备。在ＩＴＵ－Ｔ第１３研究组的建议Ｇ．９６３中,接入网被定义为本地交换机（ＬＥ）与终端设备（ＴＥ）之间的实施系统,其目的是综合考虑本地交换局。用户环路和终端设备,通过有限的标准化接口将各种用户的需求接入业务节点。接入网的引入给通信网带来新的变革,使整个通信网络结构发生了根本的变化。 由于受传输损耗、传输带宽及噪声等的限制和影响,现行铜线接入网已越来越难以满足…     

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.