基于FPGA的小型程控交换机的设计

本文针对数字程控交换机的交换原理进行了研究,将程控交换所实现的功能设计到一块大容量的FPGA芯片上,并在此基础上进行了小型数字程控交换机的硬件和软件的设计。     

处理程控交换机数字中继故障探究

随着技术的发展,程控交换机越来越多地被应用电子通讯中来.然而,由于电子通讯的不稳定性,程控交换机数字中继故障情况时有发生.本文在对程控交换机数字中继故障的类别进行交换的基础上,就如何处理程控交换机数字中继故障的措施进行了具体的阐述.     

程控交换机与载波机的接口电路

随着程控数字交换机在各个领域的广泛应用，在某些功能上的局限性也暴露出来，需要设计转换电路来保证正常运行。介绍一种程控数字交换机与载波机的接口电路。阐述了接口的组成及其工作原理，并对关键电路进行详细的说明。该接口已作为HARRIS20—20程控数字交换机的配套产品出售。性能可靠稳定。     

MCS-51单片机在程控数字交换机中的应用

给出了应用ＭＣＳ－５１单片机芯片８０３１开发的２５６路程控数字式时分交换机系统的软件和硬件设计。整个系统的软件和硬件采用模块化设计。硬件主要芯片选用了Ｉｎｔｅｌ８０３１和ＭＴ８９８０Ｄ，软件由汇编语言编写     

SOPHO程控交换机计费问题的解决方法

重点分析了SOPHO系列程控交换机在计费系统方面的难点,结合作者多年对SOPHO程控交换机维护经验,以石化公司为例详细介绍如何将SOPHO系列的程控交换机产生的话单应用在计费系统中。     

基于华为C＆C08程控交换机的电话计费系统实现

程控交换机在大中型企事业单位广泛使用，如何和程控机进行接口数据交换、将电话管理功能集成到单位内部管理信息系统中是目前程控交换机用户迫切关注的问题。本文介绍了程控交换机的接口方式，探讨了电话计费系统的功能模块设计和实现方法，并以华为C＆C08程控交换机为例，给出了该程控交换机与电话计费系统的一种实用接口实现方法。     

程控交换机的集中管理与远程维护分析

对当前程控交换机具体应用加以分析,程控交换机基本处于不间断运行状态。在24小时不间断工作中,极易出现诸多故障问题,这也意味着,对交换机要求逐渐提升。为提高程控交换机应用能力,应重点分析可能出现的故障因素,并针对不同问题,制定科学集中管理之策,并创新管理与维护方式,借助远程维护方式,解决传统维护存在的不足之处,进而提高程控交换机稳定运行能力,使程控交换机作用得到充分发挥。     

浅谈CC08程控交换机的运维经验

华为CC08交换机是比较成熟的数字程控交换设备,在当今电信通信网中得到广泛的应用。结合本人多年的运行和维护经验,本文对维护中所出现的故障进行了简要分析,叙述了对交换机的维护的注意事项和管理方式。     

一种基于PABX的办公系统的设计与实现

随着数字技术的发展和电子计算机的普及应用，传统的电话交换机正在发展成为一种能交换话音，数据和图像等多种业务的通用性通信网组网设备。本文将对一种新型的办公通讯设备进行介绍。这种新型的办公通讯设备是在一台只能交换话音的数字程控交换机的基础上实现的。     

科学家陈俊亮 通信与电子系统专家

陈俊亮（1933.10.10-） 通信与电子系统专家。浙江宁波人。1955年上海交通大学电信系毕业。1961年在苏联莫斯科电信工程学院获副博士学位。北京邮电大学教授，程控交换技术与通信网国家重点实验室主任。20世纪60年代是有线600/1200波特及无线600波特数据传输设备的主要研制者之一。参加了“DS-2000程控数字电话交换机”的研制。建立了程控交换机诊断的基本理论，提出了数字交换网络的理论模型与测试诊断算法。是中国程控软件支援系统“七五”、“八五”以及长远发展规划的主要执笔者，承担“DS-30程控数字电话交换机”及“程控交换软件单…     

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.