博科通讯发布光纤通道交换机

博科通讯日前正式发布具有高可用性的2Gbit/sec产品——32端口的企业级光纤通道交换机SilkWorm 3900,目前该交换机已经通过了博科通讯12个OEM伙伴存储产品的互操作实验。Silk Worm 3900采用了模块式设计,拥有很高的每端口性价比,满足了准备构建和正在扩展SAN的小型及中型企业需求。Silk Worm 3900采用了模块式设计,拥有很高的每端口性价比,满     

STM32CubeMX的高速USB通信模块设计

高速USB是一种具有即插即用、热插拔特点的计算机总线技术,其传输速率高而且应用广泛.但基于USB的协议模块开发比较困难,本文给出基于STM32CubeMX的高速USB通信模块设计.该方案以外扩高速USB3300芯片的STM32F4x为硬件平台,利用STM32CubeMX快速生成USB库函数和LabVIEW图形化软件编程工具,共同实现高速USB通信的高效开发.实验结果表明,该设计传输速率可达3.0 Mbps以上,且开发快捷.     

QuickLogic发布QuickPCI ESP家族新产品

嵌入式标准产品(ESP)的先驱企业QuickLogic公司(Nasdaq股票代码:QUIK)近日发布了4款专为便携式应用而优化的QL58x0系列QuickPCI新器件。QuickPCI产品家簇符合PCI2.3标准要求,并且具有低功耗、高性能、上电立即可用等优良特性。使用这4款新器件,用户可以实现高达132MBps的PCI总线性能,同时仍然能够满足诸如Mini.-PCI模块或CardBus插卡这类便携式PCI应用的严格功耗要求。QL58x0系列器件支持32位PCITarget功能。33MHz、32位的QL58x0系列器件完美组合了性能稳定的PCI2.3协议控制器与使用灵活的QuickLogicFPGA可编程逻辑…     

NI发布11款全新基于PXI的RF开关模块,用于视频和通讯测试

美国国家仪器有限公司(National Instruments,简称NI)发布了11款新的RF开关,将50和75Ohm应用的PXI RF开关模块的选择增多了一倍。这些模块包括4x1、4x1匹配、4x1双向、8x1双向多路复用器以及四重SPDT和双匹配SPDT通用配置。有了这些产品,工程师们     

NI发布11款全新基于PXI的RF开关模块,用于视频和通讯测试

美国国家仪器有限公司（National Instruments,简称NI）发布了11款新的RF开关,将50和75Ohm应用的PXI RF开关模块的选择增多了一倍。这些模块包括4x1、4x1匹配、4x1双向、8x1双向多路复用器以及四重SPDT和双匹配SPDT通用配置。有了这些产品,工程师们可以基于性价比和改善信号完整性的考虑，自主选择优化他们的RF开关网络。6款新的2．5 GHz 75 ohm模块是NI为高频率视频应用（例如置顶盒测试等）推出的第一批产品。     

一种基于嵌入式Linux图形用户接口的实现

介绍了Java技术在嵌入式L inux图形用户接口(GU I)中的应用,分析了Java GU I的标准窗口构件工具箱(SW T)以及嵌入式L inux GU I的结构和特点。然后实现了一种基于嵌入式L inux GU I系统架构SW T+G tkFB,并作了深入而全面的分析,最后展望了其发展前景。     

证券网络系统冗余解决方案

随着国家对证券行业的政策的变化,特别是指定委托交易使很多证券公司越来越重视网络的安全、冗余问题。在这种特殊的情况下,我公司为证券行业设计了一个冗余解决方案。该方案可提供从服务器到交换机的完全冗余。以下是方案说明: 中心交换机选用两台24口的Su-perStack Switch 3900(3C39024),用来连接服务器,电脑房中的设备和一些100M集线器,提供办公室和大户室中工作站的接入。利用Switch3900上的千兆位端口,通过一条IGB的线路将两个Switch3900连接起来。然后为每个Switch3900配一个千兆以太网模块,用来连接一楼中的两台Switch3300。     

基于ARM-Core4x 嵌入式软件平台的实现方法

针对基于ARM-Core4x微处理器的管脚功能可配置的特点,降低应用业务模块对硬件驱动层关注度及业务代码与驱动代码耦合性,提出了一种基于ARM-Core4x微处理器的嵌入式软件开发平台设计方法,该平台可提供了基于POSIX标准的硬件操作接口和操作系统及网络协议基本应用的接口,并通过子模块间逻辑调用机制的合理设计,实现了平台核心模块和应用模块独立编译且运行期间相互调用功能模块,实现开发平台的整体功能;通过对该平台软件的应用模块二次开发,减少用户应用开发对ARM微处理器硬件的关注度,使用户开发重点聚焦在应用及业务的实现上;实践证明,该软件平台可方便应用在低压继电保护装置以及智能化设备产品的开发,提高了用户应用开发效率和降低开发难度。     

嵌入式Linux下IC卡接口设计与驱动开发

L i n u x 系统中,设备驱动程序提供了设备和上层应用空间的标准抽象接口,使得硬件响应这个标准的内部编程接口;而用户则可以通过一组标准化的系统调用对硬件设备进行打开、关闭、读写、参数控制设置等特定的操作。本文首先介绍 L i n u x 下设备模块的概念和基本分类,然后介绍 I C 卡设备的硬件接口设计以及在 L i n u x 系统下如何应用字符设备开发 I C 卡设备驱动模块。     

PC服务器主打64位——曙光推出4款基子Opteron的服务器

x86架构的 PC 服务器一直以来只能运行32位的应用,但 AMD 推出的 Opteron 处理器改变了这一局面,Opteron x86-64/32的兼容结构,使其不仅能在 x86架构上运行传统的32位应用,更能运行64位的应用,这使PC 服务器也迈人了64位的殿堂。8月18日,曙光正式推出四款基于 Opteron 的 PC 服务器,希望通过这一产品的推出发动     

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.