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1.
一种现代企业资源计划管理模式   总被引:3,自引:0,他引:3  
介绍了一种现代资源计划(ERP)管理技术情况,以及该系统研制开发的体系结构。利用面向对象的思想分析和设计系统,构造对象模型及协作模型,采用AcvtiveX技术将模型中的对象制作成OCX控件,,再将控件嵌入支持OLE技术标准的开发平台,组建ERP原形系统。最后介绍了系统的特点和应用。  相似文献   

2.
查伟  诸鸿文 《通信学报》1998,19(1):35-38
X.400电子邮件实现加密、签名等安全功能,必须要有证书管理机关来为用户签发证书。证书管理机关不可能只有一个,并且还需与其它系统互通证书。因此,采用分级的方法把多个证书管理机关组织起来,从而使用户能快速、有效地互相验证证书,同时使不同系统的证书也能互相验证。本文对X.400下的证书管理作了一些研究,实现了基本框架模型。  相似文献   

3.
仲兆祥  范戈 《电信技术》2000,(11):28-30
给出X接口安全管理的基本模型,分析X接口的安全威胁。安全目标和安全业务,探讨了不同安全业务的实现优先级和各种安全管理实现方案,提出一种结合安全前端设备与端系统安全集成的安全管理实现方案。  相似文献   

4.
本文介绍数据箱库BOXDB的模型及数据箱结点结构,并给出它的数据管理方法,方法是一组以C编写的专用库函数。  相似文献   

5.
结合基于ITUX.400的电子邮件系统,介绍基于ITUX.500目录服务的管理系统的优点及其设计和实现;分析了管理系统实现的策略、X.500目录服务和管理系统的构架;介绍该系统实现的配置管理、路由管理和安全管理等功能。  相似文献   

6.
XENIX系统是一种微机上使用的分时的多用户、多任务的系统。本文介绍了应用XEMX系统,开发出的微波线路日常运行管理事务性处理系统软件。  相似文献   

7.
双光子Jaynes-Cummings模型的亚泊松光子统计特性研究   总被引:4,自引:1,他引:3  
本文利用量子电动力学理论和缀饰原于方法,对双光子James-Cummings模型中单模激光场的稳态亚泊松光子统计性质进行了系统研究。结果表明:激光上能级相对泵浦参量Xa具有一个确定的阈值Xat;当Xa>Xat时,光场呈现亚泊松光子统计;而当Xa>>Xat时,光场将呈现出深度且完全恒定的亚泊松光子统计。  相似文献   

8.
通过对TCP/IP、SPX/IPX和X.25协议的研究,结合路由器在网络中的层次结构,提出了多协议路由器的协议体系结构,并选择合理的软件设计方法,对各个协议进行具体实现,完成一个多协议路由器的应用模型。  相似文献   

9.
首先建立缺陷空间分布和粒径分布的模型,并讨论了缺陷通过版图产生电路错误的过程,给出了IC功能成品率模拟器XD-YES的实现。用XD-YES对微电子测试图和实际IC的功能成品率模拟和分析表明,其结果与实际符合很好,从而表明XD-YES的可行性和实用性。  相似文献   

10.
VLSI成品率预测与仿真   总被引:6,自引:1,他引:5  
郝跃  林锐  马佩军 《电子学报》1999,27(2):55-58
本文建立IC光刻工艺相关缺陷计算模型和基于Monte Carlo统计成品率计算模型。阐述了集成电路功能优品率仿真系统XD-YES实现,讨论了应用XD-YES实现的功能成品率设计,并给出该系统实用性验证。研究分析表明,其结果与实际结果符合很好。  相似文献   

11.
Ishii  H. 《IEEE network》1989,3(5):12-16
The author discusses an ISDN user-network interface management protocol. The protocol enables users to manage network services, operation (such as network reconfiguration and routing change), and maintenance. That the user equipment should be looked at from both user-of-service and manager-of-service perspectives is emphasized in a discussion of the relation of the user equipment to the Telecommunication Management Network (TMN). The current status of the ISDN UNI management protocol architecture studies in CCITT is reviewed, and problems specific to the ISDN environment are identified. The need to strengthen the convergence function to solve ISDN-specific problems is stressed. Examples of ISDN UNI management protocol applications are given  相似文献   

12.
The integrated services digital network (ISDN) offers on-demand switched end-to-end digital connectivity over the wide area, enabling the integration of both voice and data services over a common core network. This paper considers the role of ISDN in data networking, both as the core transport network and as a means of enhancing resilience in a mixed-technology data solution, complementing other data network technologies. The issues associated with data transport based on an ISDN solution are considered, and include security, bandwidth utilisation, scalability and the management of ISDN-attached devices. Optimising the use of ISDN networks for supporting the most prevalent routed and routeing protocols is also discussed.  相似文献   

13.
The author discusses the ISDN Staged Transport System (STS). The STS illustrates how an ISDN network can be used as a flexible distribution medium for directing real-time signals over a WAN to a staged transport server. Although the signal feeds distributed by the STS application are audio voice grade circuits (VGCs), the architecture lends itself to other signal types, such as video. Moreover, ISDN bridges and routers allow the real-time communications infrastructure to distribute bulk recorded signals as well. Finally, the multimedia wide-area connectivity provided by ISDN allows an entire signal processing operation to be remoted, with receivers, storage, and mission control all managed from a single site (or multiple sites) on the network. While the STS application uses the user to user information element (UU-IE) to control signal processing on the edge of the ISDN network, the UU-IE could just as easily be used on the interior of the network by switch adjuncts to augment dialed number routing with intelligent-application-based routing. When combined with the rich set of commercially available applications available on many ISDN switches and adjuncts, sophisticated signal processing, distribution, and management networks could be rapidly configured and deployed with relative ease  相似文献   

14.
This paper addresses the topic of signalling and connectionless data transfer virtual channels in ATM at the UNI. It recapitulates on the access signalling support in narrowband ISDN, as a representative of an STM network and the predecessor of the coming broadband ISDN. Also, the influence of the customer premises network architecture is taken into account. From there, it is investigated in which ways these principles can be extended, into a general access infrastructure and access configuration management for signalling and connectionless services in the ATM-based broadband ISDN. Some possible implications for the internal architecture of the CPN and the network are discussed. This brings some insight into the restrictions which standardization of these principles at the UNI may bring along for the architecture.  相似文献   

15.
The article demonstrates how the services of National ISDN can be used to meet the demands of transaction-oriented applications in the retail industry. The data applications discussed are credit/debit authorization, inventory management, and credit account database access. Public network solutions using various National ISDN features and complementary telecommunication devices with a market focus are employed for the above applications. Further, the article discusses the evolution of telecommunications devices from a standards point of view and discusses the progress made in this area  相似文献   

16.
It is argued that ISDN computer-aided telephony requires properly architected platforms to satisfy changing application needs during the 1990s. Proper architecting necessitates the use of functionally rich and consistent telephony application programming interfaces (APIs). Other APIs are also needed to support integrated applications. The coexistence of telephony and other APIs must be accommodated in the ISDN driver architecture to make efficient use of D-channel signaling and voice, data, or image communications on the associated B/H channels. This driver may support Open Systems Interconnection (OSI), Systems Network Architecture (SNA), X.25, or other protocol stacks in the same computer using a single ISDN access link. Applications being currently explored show that significant benefits can be realized using incoming call management and LAN-based image server access by means of ISDN. It is envisioned that by the year 2001, a common API will facilitate multimedia applications on multivendor platforms architected within the OSI framework. These platforms will support interconnections of public and private ISDNs and bridging to BISDNs  相似文献   

17.
本文根据中国电信经营考察团1995年底赴法国考察的内容,概述了法国电信的管理体制与经营状况,以及在大客户的管理与服务、基础网结构、智能网和ISDN业务的发展等方面的做法和经验,以期有关运营部门参考。  相似文献   

18.
孙敏 《电信快报》1998,(9):20-23
本文介绍ISDN的基本概念 ,中国ISDN业务飞速发展的状况。并结合实际 ,着重讨论了ISDN与电视会议系统、ISDN与Internet的接入等当今ISDN应用最广泛的业务。  相似文献   

19.
It is argued that making integrated services digital networks (ISDNs) more popular among personal computer users is essential for ISDN to prosper. Users in offices, businesses, and at home form a large potential ISDN market. Existing ISDN interface modules such as ISDN adapter boards for personal computers, are limited to ISDN features and can hardly handle the various needs of personal users. An ISDN interface module for personal computers must be designed to handle various applications and provide any-to-any communications. An ISDN personal computer interface developed to handle digital and analog communication protocols and flexibly combine resources is described  相似文献   

20.
ISDN与LAN远程互连   总被引:1,自引:0,他引:1  
何永明  徐亮 《电信科学》1998,14(3):23-25
本文主要介绍了ISDN与LAN远程互连的模式和互连设备,分析了ISDNMAC网桥和ISDNIP网关的体系结构,并提出一种简单易行的ISDNMAC网桥的方案。  相似文献   

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