基于AS5643协议的接口模块设计与实现

随着IEEE-1394总线成功应用于航空领域,IEEE-1394总线已成为新一代机载总线中的一员。为解决IEEE-1394总线在航空电子系统中的应用,满足机载环境的使用要求,符合AS5643协议对1394总线的确定性和可靠性要求。本文从硬件架构、FPGA逻辑架构和软件架构三个方面详细阐述了一种基于AS5643协议的接口模块的设计与实现,提出了一种基于FPGA逻辑实现AS5643协议的解决方案。最后通过实验验证,结果表明该模块满足设计指标,性能良好,实现了较高的传输速率,满足机载环境的应用需求。     

一种改进AS5643节点传输效率和容错性的方法研究

1394B作为成熟的商用总线,具有传输速率高、传输距离远、传输介质丰富等特点,并支持物理闭合环拓扑,具有一定的冗余可靠性。SAE AS5643在1394B总线的基础上,从实时性和确定性的角度出发,对1394B总线应用进行了一系列的扩展和约束,使1394B总线能够满足航空等领域的应用要求,但AS5643未能对传输效率和容错性进行详细的规定。文中研究和分析了AS5643标准定义的数据结构和传输特性,结合1394B总线协议的相关规定,提出了改进总线传输效率和容错性的措施。最后,利用FPGA逻辑和Link/PHY芯片实现了AS5643定义的CC/RN功能节点。经测试表明,文中提出的改进措施能够有效提高CC/RN功能节点的传输效率和容错性。     

飞管1394总线接口模块设计实现

在面向新一代飞机管理系统的1394总线应用中,为满足节点标准化设计,提高电气特性信号质量,降低节点的维护成本,提出了一种基于1394总线协议的飞管1394总线接口模块。该模块具有功耗低、体积小、重量轻、可靠性高的特点,并且1394总线3个端口分别通过3根1394专用电缆以辫接方式引出,实现了接口的标准化和统一化。在充分理解1394总线协议的基础上,分别从硬件架构、逻辑设计和软件设计方面介绍了飞管1394总线接口模块的设计与实现,通过测试与验证,表明该接口模块功能与性能满足机载环境的应用需求。     

一种基于SAE AS5643协议的转发设计与实现

针对航空航天领域通信时高安全、高可靠性的要求,基于SAE AS5643的1553B协议[1]得到广泛应用,其系统灵活度高、总线带宽大以及可扩展性强等特点优于传统总线.对SAE AS5643协议进行了特征分析,提出了一种通过FPGA实现对AS5643协议的 1394B总线数据转发、监控的解决方案,并将监控数据通过PCIE...     

基于AS5643协议的Mil-1394仿真卡设计与实现

仿真卡是现代地面仿真系统的重要组成部分,Mil-1394仿真卡则在机载军用1394总线网络地面仿真系统中发挥着非常重要的作用。结合军用航空领域广泛应用的SAEAS5643协议,文中系统性地介绍了一种Mil-1394总线仿真卡的解决方案,叙述了其硬件和逻辑构架,详细阐述了仿真卡的软件设计,并进行了大量的仿真实验和数据分析。实验结果充分表明该仿真卡达到了较高的传输速率,功能完备,性能良好,全面满足地面仿真系统的应用需求。     

航电1394总线节点设计实现

机载总线节点接口模块作为系统总线网络的接入节点,其功能性能的完备性、可靠性对于总线网络系统的构建有着至关重要的作用。1394总线作为新一代飞机航空电子系统的网络传输总线,其节点模块设计的重要性不言而喻,以1394总线协议为依据,结合总线系统的需求背景,设计了一种航电1394总线节点接口模块。该模块基于标准化、通用化的设计思想,提取用户共性需求,结合1394总线协议层次结构,确定最终的产品架构。总线节点功能设计中采用CC/RN/BM一体化设计,提供PCI/PCIE主机接口,支持S100B/S200B/S400B可配置总线通信速率,设计灵活,为用户提供标准软硬件接口,有效降低了设计、维护成本。     

基于PCIe总线的双路1394B接口模块设计与实现

为了满足航电系统中前端传感器捕获的图形图像数据实时传输的需求,设计并实现了基于PCIe总线的双路1394B接口模块。该模块通过PCIe接口与主机交互,采用S400β传输模式,软件设计符合标准OHCI规范,支持AS5643协议,异步流包数据收发采用链式队列管理,主机与1394B控制器之间通过DMA操作,实现大数据块的并行处理,两路1394B相互独立,显著提升数据传输性能。测试验证结果表明,该模块具备带宽高、可靠性高、CPU资源占用率低等特点,已在某项目获得成功应用,实现了图形图像数据的实时传输,满足系统设计要求,表现出了良好的稳定性和适应性,具有实践应用价值。     

基于IEEE-1394总线的高速数据采集系统设计

为了实现数据采集系统实时性、通用化、小型化设计,该文提出了一种基于IEEE-1394总线的高速数据采集系统设计和实现方案。硬件架构上,系统采用IEEE-1394总线专用芯片,实现了数据高速率、高可靠性传输;采用FPGA+DSP的数据处理架构,将数据采集与算法处理分开独立运行;采用FPGA静态局部重构技术,实现了不同子系统的功能配置;采用开关动态切换技术,实现了信号采集的灵活配置和小型化设计。软件架构上,系统采用模块化设计思路,实现了不同工作模式之间的切换。实验表明该系统具备很强的数据采集与解算能力。     

基于IEEE-1394总线的高速数据采集系统设计

为了实现数据采集系统实时性、通用化、小型化设计,该文提出了一种基于IEEE-1394总线的高速数据采集系统设计和实现方案。硬件架构上,系统采用IEEE-1394总线专用芯片,实现了数据高速率、高可靠性传输;采用FPGA＋DSP的数据处理架构,将数据采集与算法处理分开独立运行;采用FPGA静态局部重构技术,实现了不同子系统的功能配置;采用开关动态切换技术,实现了信号采集的灵活配置和小型化设计。软件架构上,系统采用模块化设计思路,实现了不同工作模式之间的切换。实验表明该系统具备很强的数据采集与解算能力。     

飞行控制系统中Mil-1394b仿真节点实现

针对高带宽、低延迟、高可靠的军用需求,及针对要求具有较高的实时性、确定性、可靠性的飞行控制系统,对IEEE-1394b和AS5643的协议结构进行了研究,研发了Mil-1394b总线接口板。详细叙述了板卡的功能、硬件板卡的原理及实现、软件实现,进行了大量的仿真、调试和分析。该板卡达到了较高的传输速率,性能良好,满足设计需求,已应用于某些飞行控制系统中。     

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。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。