自动取款机纸币序列号图像采集装置的研制

自动取款机(简称ATM)纸币序列号图像的正确采集是ATM纸币序列号自动识别记录装置的关键.研制了一种ATM纸币序列号图像采集装置,包括纸币位置检测单元、纸币序列号图像采集单元、系统存储与控制单元.本论文的关键在于解决了ATM出钞过程中纸币序列号的图像实时采集问题.将所研制的纸币序列号图像采集装置安装在目前流通的一款ATM中,实际运行结果表明,所给出的纸币序列号图像采集方法与装置能够正确采集到纸币出钞过程中的纸币序列号图像,经过适当的参数调整,还可以应用于不同币种和面值、不同出钞速度的ATM中.     

ATM测试仪中业务分布模型的研究

ATM是1种建立在电路交换和分组交换基础上面向连接的包交换技术,是解决各种不同类型信息联合传输问题的好方法.对ATM网络传输性能测试而言,为能更加准确地反映网络的实际性能,需要建立相应的业务流模型来模拟网络实际应用时的各种业务流.主要介绍了异步传输模式(ATM)测试技术中用得最多、最能精确刻划ATM业务流的随机统计分布...     

ATM UNI信令的软件实现

介绍了在ＱＮＸ操作系统上实现ＡＴＭ ＵＮＩ信令（用户端功能）的设计思想和程序结构。     

浅淡电力系统宽带数字通信网的建设

从节点设备和通道建设等方面讨论了如何组建经济、适用的电力系统宽带数字通信网。     

An ATM-Based Connection Management Architecture for Telecommunications Services

New open service architectures are now emerging.An important part of these architectures is theconnection management function. It enables theestablishment, control and release of semipermanentconnections requested by telecommunications services suchas virtual private networks. This paper presents thespecification, design and implementation of thisconnection management function in our OAMS Open Service Architecture. The proposed architecture isdeployed over a distributed processingenvironment.     

ATM layouts with bounded hop count and congestion

Summary. In this paper we introduce and analyze two new cost measures related to the communication overhead and the space requirements associated with virtual path layouts in ATM networks, that is the edge congestion and the node congestion. Informally, the edge congestion of a given edge e at an incident node u is defined as the number of VPs terminating at or starting from u and using e, while the node congestion of a node v is defined as the number of VPs having v as an endpoint. We investigate the problem of constructing virtual path layouts allowing to connect a specified root node to all the others in at most h hops and with maximum edge or node congestion c, for two given integers h and c. We first give tight results concerning the time complexity of the construction of such layouts for both the two congestion measures, that is we exactly determine all the tractable and intractable cases. Then, we provide some combinatorial bounds for arbitrary networks, together with optimal layouts for specific topologies such as chains, rings and grids. Received: December 1997 / Accepted: August 2000     

IP与ATM融合技术综述

分析了ＩＰ支持ＱｏＳ的局限性；简述了各种ＩＰ与ＡＴＭ事例技术的基本原理；系统地综合分析了各种融合技术的优缺点以及相互区别与联系。分析结果表明：ＩＰ与ＡＴＭ事例技术为解决路由器带宽问题和ＩＰ ＱｏＳ问题提供了一条有效途径；ＭＰＬＳ具有ＱｏＳ级别控制、业务流控制、快速自愈恢复、标记归并、良好的可扩展性以及可基于多种物理网络等诸多优点，因而应是最有希望的ＩＰ与ＡＴＭ融合技术，这些分析和结论为进一步研究Ｉ     

Access Protocols for Cellular High-Speed Data Services

In this contribution, novel access techniquesfor the future cellular information networks areproposed. To facilitate a fast deployment, the suggestedaccess techniques have been implemented over well-known technological platforms, namely DECT (DigitalEnhanced Cordless Telecommunications) containing aFDM/TDMA (Frequency Division Multiplex/Time DivisionMultiple Access) structure. Two situations areconsidered: i) no limits in the use of the all carriers atterminal (ideal case) and ii) maximum number ofcontiguous/simultaneous carriers at terminal (realisticcase). First, to grant a quick access channel, a random access mechanism with reservation is proposed.It is called contention-TDMA (C-TDMA). Next, in order tostudy the feasibility of better collision resolutionalgorithms for C-TDMA, a centralized approach called Centralized C-TDMA Demand Assignment(CC-TDMA-DA) has also been studied. For the ideal case,numerical results indicate that C-TDMA and CC-TDMA-DAyield similar throughput values in typical cellular scenarios. Also, CC-TDMA-DA tends to bepreferable for traffic sources with long messages andweak delay constraints, while C-TDMA performs better forbursty traffic sources with hard time requirements. Additional numerical results for the realisticcase have demonstrated that system performancedeteriorates little with respect to the ideal case interms of collisions, delays and throughputfigures.     

第三层交换——IP交换技术的研究

讨论了第三层交换－ＩＰ交换的关键技术，分析比较了几种不同的ＩＰ交换技术，并指出了所存在的问题。     

网络新技术ATM及其应用

简介ＡＴＭ网络新技术的特点，基本原理，分层结构，基本技术及应用。