基于以太网PHY的高速可靠数据传输方法实现

介绍了一种在成熟以太网物理层技术的基础上使用硬件协议实现的高速可靠数据传输方法。该方法不同于一般采用的TCP机制,它利用FPGA实现数据分组打包和差错控制,用硬件的方法在保证了数据可靠传输的同时实现了软件协议无法实现的高数据率。经过测试证明,该方法相对于TCP协议具有带宽利用率高、传输速度稳定、CPU占用率低的优点,适用于点到点的高速可靠数据传输．同时还支持网络的扩展应用。     

基于VB.NET的无线电设备综合测试平台

无线电设备的测试需要较多的专业知识,而且步骤繁琐.为简化无线电设备的测试过程和缩短测试时间,以VB.NET为基础研究了一种无线电设备综合测试平台.该平台能够自动控制各种无线电通信设备,实现各种参数的自动测量和处理,并自动完成数据的记录及报表的生成.使用该平台可以极大地简化人工操作的复杂度、缩短测量时间并进一步提高测试结果的准确性和权威性.     

基于LabVIEW的自动测试系统

传统的通信设备测试系统以无线电综合测试仪为中心来搭建,或采用分立仪器搭建、手动测量,这种方法成本高、自动化程度低、扩展性差。因此需要寻求一种解决方案,实现高度集成化、可扩展的测试系统。文章描述了如何采用基于LabVIEW虚拟仪器技术快速方便地开发某通信设备自动测试系统。实验证明,开发的测试系统与传统仪器测试平台相比,测试效率更高,体积更小。此外具有很好的可扩展性,开发工作周期也大大缩短。     

DDN在电网调度自动化中的应用

通信通道是电网调度自动系统中的一个重要环节。通道的质量直接影响到电网调度自动化中综合自动化数据的传输。数字数据N（Digital Data Network）是利用数字信道传输数据信号的数据传输网，利用数字信道传输数据信号与传统的模拟信道相比，具有传输质量高、速度快、带宽利用率高等一系列优点。文章介绍了DDN的技术特点，并结合番禺电网调度自动化的实际情况，阐述了其实现与使用过程中出现的问题。     

航天测量站数据池建设方法研究与数据应用

航天测控网通常由测控中心和测量站(船)组成,测量站是航天测控网的基本组成部分；在几十年的发展进程中,航天测控领域积累了海量的数据；对测量站来讲,数据可主要分为测控数据、通信数据和设备状态数据三大类；测控数据主要用于向上级报送,通信数据主要用于通信状态监视,设备状态数据主要用于设备状态的监测；当前测量站数据存在着存储零散、不成体系、相对隔离的问题；基于此提出了一种测量站数据池建设方法,能够实现数据集中控制,减少数据的冗余度,提高数据一致性和可维护性,提高数据的利用率；最后从多个方面对数据的应用前景进行了展望；测量站数据池的建设将使提升测控工作的自动化与智能化程度成为可能。     

工业企业自动化系统的发展与变化

工业企业自动化已经发展到了广义自动化、扩展自动化、综合自动化的阶段，其目的是了解、收集和掌握工厂、车间和设备的状态，对工厂、车间和设备的状态信息进行分析、理解，掌握其特性，采取相应的控制策略和控制动作，改进和提高工厂的状态，改变车间的生产指标，提高设备利用率，从而达到企业在生产自动化的基础上，实现现代管理，全面提高企业的生产，经营和管理的综合能力，从而提升企业综合竞争力。[编者按]     

无线电作弊网络化防控系统

研究了一种简便有效的无线电作弊防控系统,综合应用先进的无线电频谱检测与识别技术、自适应定向干扰技术和便携式全波段小区域屏蔽技术,最终实现对无线电作弊过程中向考场内发送答案环节的有效阻断,达到防止利用无线电设备进行考试作弊目的.有效打击了使用无线电通讯工具进行的集团化、网络化和产业化等团伙作案的考场作弊行为,突破现有反作弊设备的侦测受限.以逐渐形成一个覆盖整个北京市区考场的防无线电作弊的网络化防控体系.通过系统设计实现,包括监测设备和干扰设备等的应用效果显著,而且提高考务工作有效性.     

基于VPX总线的无线电指令收发测试系统设计

无线电指令收发单元作为导弹的重要弹上仪器,用于导弹制导控制,其内部组成与功能复杂,指标要求高,有必要研制无线电指令收发单元自动测试系统。基于VPX总线构建的自动测试系统,具有高带宽、高硬件密度以及高可靠性等特点,尤其适用于无线电通信设备的自动化测试。采用FPGA和ARM为核心设计VPX总线无线电测试模块,实现了无线电测试高实时性的设计要求,同时具有良好的通用性和扩展性,该设计能够推广到其他具有实时性测试和大容量数据处理要求的应用场合。     

基于PLC的污水处理厂自控系统设计

针对传统污水处理过程自动化程度低,效率低下的具体特点,结合OMRON PLC构建了分布式控制系统,分析了具体的工艺流程和模块设计,实现了可靠性高、控制灵活、扩展容易的自动化污水处理系统。     

基于虚拟技术的生产过程自动化实训室的建设

过程自动化实训室的建设是以昂贵的自动控制系统为中心,借助于网络技术、多媒体技术、虚拟技术,实现了由一套设备到多套设备的虚拟扩展,具有资源共享、可扩展性好、设备投资低、教学质量高、教学效果好等优点,可为相关的学校或企业进行职业技术培训提供借鉴。     

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.