FC协议分析仪软件设计与实现

光纤数据通道以其高带宽,低延时,可靠性强等特点成为新一代航空电子系统的主干网络。FC协议分析仪是FC网络测试、仿真、故障诊断、协议验证的必要设备,作为其核心和基础的软件功能及架构将直接影响整个系统的性能及易用性。本文在对FC协议分析的基础上,结合FC分析仪硬件系统,提出了软件的功能与架构设计方案,重点阐述了追踪控制、性能监控、踪迹查看、专家系统功能软件的设计思路。该软件为用户提供了友好的交互界面,结合系统硬件可在线和离线测试、分析FC网络状态,满足了FC协议分析的功能及性能要求,为FC网络系统的开发提供了有力的支撑。     

基于FC-AE-ASM协议仿真测试系统设计与实现

针对新型航空电子系统修理中对光纤通道(FC)网络的修理需求,设计了一种基于FC-AE-ASM协议的仿真测试系统。首先,简述了FC网络技术特点、上层协议、网络故障机理;其次,分析了系统应用需求;最后,给出基于FC-AE-ASM协议的FC网络修理仿真测试系统的硬件和软件设计,实现了FC-AE-ASM节点和网络通信及协议分析功能。通过测试验证,达到了测试数据采集分析的实时性和可视化要求,为FC网络修理做好技术储备。     

基于FPGA的多功能FC协议分析仪设计

光纤通道是下一代航空电子统一网络的一种主要联网标准,广泛应用于航空电子系统设备的互连、通讯等领域。专门的FC仿真测试、调试分析设备是加速机载FC设备研制所必需的仪器,是设计的协议符合性、可靠性和性能等的保障,也是维护和排故的有效工具。但是,由于FC协议的复杂性等原因,目前专用FC协议仿真、测试分析设备的研发远滞后于机载FC设备的研制。针对这一现状,提出了一种支持原语和帧捕获分析、故障注入、压力测试等多项功能的FC协议分析仪设计方案,描述了其系统结构和硬、软件组成,并详细说明了其核心FPGA的设计思路。该分析仪具有便携、功能丰富、使用简便直观的特点,能够替代昂贵、复杂的国外商用FC测试设备,具有广阔的市场前景。     

基于FPGA的多功能FC协议分析仪设计

光纤通道是下一代航空电子统一网络的一种主要联网标准,广泛应用于航空电子系统设备的互连、通讯等领域.专门的FC仿真测试、调试分析设备是加速机载FC设备研制所必需的仪器,是设计的协议符合性、可靠性和性能等的保障,也是维护和排故的有效工具.但是,由于FC协议的复杂性等原因,目前专用FC协议仿真、测试分析设备的研发远滞后于机载FC设备的研制.针对这一现状,提出了一种支持原语和帧捕获分析、故障注入、压力测试等多项功能的FC协议分析仪设计方案,描述了其系统结构和硬、软件组成,并详细说明了其核心FPGA的设计思路.该分析仪具有便携、功能丰富、使用简便直观的特点,能够替代昂贵、复杂的国外商用FC测试设备,具有广阔的市场前景.     

FC网络仿真验证系统构建及关键技术

FC网络仿真验证系统为高效、快速构建FC网络提供了有效途径。基于对FC协议及应用需求的解读和分析,详细阐述了FC仿真验证系统的构建过程及相关网络数据收发、交换、监控、分析、采集和记录等关键技术的解决途径,为FC网络技术的应用提供了基础理论体系、系统解决方案及测试验证平台。     

VxWorks中基于TCP/IP的网络通信应用研究

本文结合嵌入式实时操作系统VxWorks实现网络通信系统的实际应用,讨论了在VxWorks下实现网络通信的关键技术和相应的机制,并已经在网络测试仪中得到了良好而有效的应用。开发出的基于VxWorks的网络测试分析仪,能够提供全面的统计性能测量、激励与响应测试、协议解码工具等功能。该分析仪已应用于高速网络通信中,并取得了良好的效果。     

工业无线全信道协议分析仪的设计与实现

该文研究的工业无线全信道协议分析仪,是一种能对基于IEEE 802.15.4的2.4 GHzISM频段全部16个信道进行实时数据采集的设备,结合上位机协议分析软件对实时数据进行解析,对于工业无线协议系统开发,可提供协议分析、性能测试、辅助设计、安全评估、故障诊断等服务。本协议分析仪是极具应用价值的协议测试和维护工具,适用于ISA100.11a、WIA-PA、Zigbee等工业无线标准,有着良好的应用范围。     

FC数据采集记录器软件设计与实现

FC（ Fibre Channel,光纤通道）数据采集记录器用于对FC链路数据的采集、记录与卸载,是实时监控和事后分析FC通信状态的必要设备,作为其核心和基础的软件将直接影响整个系统的性能。文中在对FC网络分析的基础上,结合FC数据采集记录器硬件系统,提出了软件的功能与架构设计方案,重点阐述了数据采集、记录、卸载软件的设计思路。该软件协同系统硬件可实现不低于100 MB/s的数据实时采集和200 MB/s的数据记录与卸载,满足了高带宽光纤通道数据的采集、记录与卸载要求。     

NI扩展数字音频测试系列产品

2009年3月,美国国家仪器有限公司（简称NI）推出了扩展数字音频测试性能的新版AudioMASTER,为模拟和数字音频验证及生产测试增加了一个新的解决方案。基于可配置的AudioMASTER6．0软件接口结合高性能的NIPCI和PXI模块化硬件,为用户提供一种简单易用、以软件定义的测试解决方案,它提供的性能完全可以与高端音频分析仪相提并论。可以结合AudioMASTER6．0软件、NI7813R可配置I／O硬件和NICB-2180 FlexSPDIF附件,对诸如机顶盒、     

基于FPGA的双通道FC数据采集卡设计

光纤通道(Fiber Channel)网络具有低延时、高带宽、高可靠性等特点,非常适合于对数据传输带宽和速率有较高要求的综合式航空电子系统。为了解决航空电子系统FC网络测试环境中多路高带宽、大容量数据实时采集和快速存储的问题,在对FC协议进行深入研究的基础上,提出一种双通道FC数据采集卡解决方案。以含高性能处理器的FPGA为核心,构造嵌入式数据采集系统,使用硬件实现FC协议的解析和处理,软件实现数据存储格式的控制,并行地对两路FC输入数据进行采集,将处理后的数据以轮询优先级的方式,通过SATA接口写入到大容量存储设备中,完成采集数据的存储,为光纤通道网络测试技术在航空电子系统中的应用奠定了基础。     

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.