基于Verilog语言的帧同步的实现

现代数字通信中往往采用数字复接技术扩大信息的传输容量并提高信道利用率。帧同步是数字复接系统中的重要部分。本文采用Verilog硬件描述语言给出了帧同步的提取方法,同时在Altera公司的QuartusⅡ5.1软件下进行了编译和仿真,成功地提取出了帧同步头和有效的输入数据。     

新一代声码器Q4401及其应用

论文介绍了单片可调速率声码器Q4401的工作原理及特点;给出了一个以Q4401和高速单片机为核心的数据话音复接系统;分析了通过采用数据复接技术,利用一个通用调制解调器,实现在同一条模拟电话线上语音和数据的同时传输。     

基于FPGA的多路数字信号复分接器的设计

数字复接技术是现代数字通信中常用的技术。本文给出了一种采用时分复用技术,基于FPGA对语音、同步数据、异步数据等多路不同等级数字信号进行复分接设计与实现的方法,对设计与实现过程关键技术进行了详细的论述,同时对设计中需要注意的问题做了必要的说明。     

一种电力多业务综合光端机的开发与设计

本文设计一种电力专用型多业务综合光端机,通过复分接技术,实现了语音、视频、数据同步处理后进行光纤通信,远程传输无人值守变电站等现场的仪表检测数据、设备故障、现场环境等运行信息,以图像、语音、数据等方式同步传输到电力监控平台,与已有的终端控制系统相互配合,实现了电力系统遥感、遥控、遥测。     

基于复分接技术的电力专用型视频光端机的开发与设计

本文设计一种电力专用型视频光端机,通过复分接技术,实现了语音、视频同步处理后进行光纤通信,远程传输无人值守变电站等现场的仪表检测数据、设备故障、现场环境等运行信息,以图像、语音、数据等方式同步传输到电力监控平台,与已有的终端控制系统相互配合,实现了电力系统遥感、遥控、遥测。     

基于复分接技术的电力专用型视频光端机的开发与设计

本文设计一种电力专用型视频光端机,通过复分接技术,实现了语音、视频同步处理后进行光纤通信,远程传输无人值守变电站等现场的仪表检测数据、设备故障、现场环境等运行信息,以图像、语音、数据等方式同步传输到电力监控平台,与已有的终端控制系统相互配合,实现了电力系统遥感、遥控、遥测。     

STANAG7023标准介绍与应用研究

STANAG 7023标准是一种军事领域使用的数据复接标准,用于处理文字与图像信息。这一标准通过添加分类标识、时间戳、校验码等冗余信息将信息复接数据包,再将数据包排列为数据段,最后将数据段排列成数据记录,完成复接的功能。在实际使用中,这一标准的缺点是针对辅助信息的复接效率非常低。选取平均长度为28字节的五种常用的信息做复接时,复接效率不足15%。针对这一缺陷,本文利用定长帧与变长帧结合的思想,改进复接方案,将辅助信息复接效率提高到48.3%,提高了信息的复接效率。     

基于同步时分复用技术的数字CCD图像数据的光纤传输设计

针对数字CCD图像数据传输的问题,提出了一种借助于光纤的串行传输方案,阐述了系统工作原理、硬件结构和软件仿真。以CPLD和FIFO为核心器件,基于同步时分复用原理,实现了2路同步控制信号和8路图像数据的不同速率信号的复接和分接。对以往的并行传输系统进行了改进,简化了系统结构,并实现了CCD相机图像数据高速率,远距离传输的要求。     

UMTS系统中IPv6传输网带宽有效利用的实现

全IP是第三代移动通信发展的必然方向,IPv6作为第三代移动通信的传输技术,其传输过程中的带宽有效利用是个关键的问题。该文介绍了传输层复接技术的原理,给出了在IPv6协议上实现传输层复接的方法,提出了TMux表和TMux缓冲概念,并在IPv6路由器上实现了传输层复接功能,讨论了有待进一步研究的问题。     

嵌入式软件在高速CCSDS复接/分接设备的应用

给出一个符合CCSDS标准的高速复接/分接设备的软件设计方案.该设备可以将来自不同信源的数据按虚拟信道的概念进行实时复接和分路,实现了TCP/IP协议和CCSDS标准之间的相互转换.介绍了该设备的软件开发技术数据复接、数据分接及帧同步.     

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.     

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。     

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.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

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     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.