在TCP／IP网络环境上实现全分布式文电作业系统MHS

ＭＨＳ标准是根据ＩＳＯ的ＯＳＩ七层参考模型原理和ＣＣＩＴＴ Ｘ．４００系统标准设计与制定的，但是，由于目前按照ＯＳＩ标准实现的网络产品尚不成熟，使得难以在其上提供开发ＭＨＳ的环境。而ＴＣＰ／ＩＰ网络环境，作为网络互连事实上的标准，它为ＭＨＳ的实现可提供最可靠，最完善的支持。本文着重研究ＭＨＳ在ＴＣＰ／ＩＰ网络环境上的实现，并给出实现过程。     

关于信报处理国家标准

信报处理系统（ＭＨＳ）是八十年代初期出现的一种新型电子邮件系统，是计算机技术和通信技术长期发展与结合的产物。ＭＨＳ采用先进的存储转发通信机制，能处理包括声音，二进制数据和图像信息等各类信报，是目前正在使用的功能最强也最完整的综合通信系统。ＭＨＳ是根据ＯＳＩ参考模型原理和ＣＣＩＴＴ的Ｘ．４００系列标准设计和开发的，由于ＭＨＳ建立在坚实的国际网络标准技术之上，因此具有广阔的发展前景。近年来，我国研究和     

一种实现Novell网络经X．25网连接NET400电子邮件系统方法

本文在分析符合Ｘ．４００协议的ＮＥＴ４００电子邮件系统结构和Ｎｏｖｅｌｌ网特点，ＯＳＩ网络互联模型的基础上，提出了一种使Ｎｏｖｅｌｌ网通过Ｘ．２５网连接ＮＥＴ４００电子邮件系统的“专用收发工作站”方法。这种专用收发工作站可以起到连接Ｎｏｖｅｌｌ网和Ｘ．２５网“信关”的作用，而且实现简便。     

应用TCP／IP实现UNIX与WINDOWS的网络通信

阐述了 Ｓ Ｏ Ｃ Ｋ Ｅ Ｔ 的实质,并实现了基于 Ｔ Ｃ Ｐ／ Ｉ Ｐ 协议进行 Ｕ Ｎ Ｉ Ｘ 与 Ｗ Ｉ Ｎ Ｄ Ｏ Ｗ Ｓ 网络间的信息交换。     

A COUNTER－EXAMPLE TO A FAST ALGORITHM FOR FINDING THE CONVEX HULL OF A SIMPLE POLYGON

ＡＣＯＵＮＴＥＲ－ＥＸＡＭＰＬＥＴＯＡＦＡＳＴＡＬＧＯＲＩＴＨＭＦＯＲＦＩＮＤＩＮＧＴＨＥＣＯＮＶＥＸＨＵＬＬＯＦＡＳＩＭＰＬＥＰＯＬＹＧＯＮＧｏｄｆｒｉｅｄＴｏｕｓｓａｉｎｔＡＣＯＵＮＴＥＲ－ＥＸＡＭＰＬＥＴＯＡＦＡＳＴＡＬＧＯＲＩＴＨＭＦＯＲＦＩ...     

AS／400,SCO UNIX和NETWARE平台上IP ROUTER的实现

本文叙述了ＡＳ／４００，ＳＣＯ ＵＮＩＸ和ＮＥＴＷＡＲＥ上ＩＰ ＲＯＵＴＥＲ实现的原理和配置方法。     

基于选择竞争的自适应并行模拟退火方法

基于选择竞争的自适应并行模拟退火方法彭玉青，沈雪勤（河北工业大学计算机系）ＡＰＡＲＡＬＬＥＬＡＤＡＰＴＩＶＥＳＩＭＵＬＡＴＥＤＡＮＮＥＡＬＩＮＧＡＬＧＯＲＩＴＨＭＢＡＳＥＤＯＮＳＥＬＥＣＴＩＶＥＣＯＭＰＥＴＩＴＩＯＮ￥ＰｅｎｇＹｕｑｉｎｇ；ＳｈｅｎＸ...     

异构环境下的文件传输服务系统（FTS）

本文介绍了一种异构环境下（异种网络协议、异种机）的多功能文件传输服务系统（ＦＴＳ）的设计和实现原理、系统提供的服务，以及系统的应用范围等。ＦＴＳ系统基于ＩＳＯ／ＯＳＩ的ＦＴＡＭ标准，采用了标准软件集成、队列管理技术和协议迁移技术，为用户提供了不同机型、不同操作系统、不同网络和协议（ＯＳＩ，ＳＮＡ，ＴＣＰ／ＩＰ等）之间的文件传输服务，并为用户进一步开发网络上的应用业务提供了良好的操作平台。     

四值I^2L电路的输出电流信号综合技术

四值Ｉ~２Ｌ电路的输出电流信号综合技术邓小卫，吴训威（杭州大学电子工程系杭州３１００２８）ＳＹＮＴＨＥＳＩＳＴＥＣＨＮＩＱＵＥＦＯＲＯＵＴＰＵＴＣＵＲＲＥＮＴＳＩＧＮＡＬＳＩＮＱＵＡＴＥＲＮＡＲＹＩ~２ＬＣＩＲＣＵＩＴＳ￥ＤｅｎｇＸｉａｏｗｅｉａｎｄＷ...     

制造质量管理数据标准化策略及数据交换接口

制造质量管理信息是制造过程中非常重要的信息，其数据模型标准化是信息集成的关键．本文详细论述了基于ＳＴＥＰ方法学和ＩＳＯ９０００标准的制造质量管理数据的标准化策略，并给出通过对象树图实现ＩＤＥ－ＦＩＸ和ＥＸＰＲＥＳＳ间模型转换的一种数据交通接口     

A critical analysis of the X.400 model of message handling systems

The CCITT X.400 model of store and forward Message Handling Systems (MHS) serves as a common basis for the definition of electronic mail services and protocols both within CCITT and ISO. This paper presents an analysis of this model and its related recommendations from two perspectives. First the concepts of service, protocol and interface are discussed together with their application to this model; second the positioning within ISO's reference model for Open Systems Interconnection (OSI) is commented on.     

X.25 protocols in the airline industry

The requirements of a highly reliable data transport mechanism are outlined, and a practical implementation of the CCITT/ISO standards within the airline is demonstrated. An understanding of the ISO Open Systems Interconnection architecture, as well as CCITT recommendations such as X.25 and X.75, is assumed. The selection of various X.25 subsets and how they meet the data communications needs of a variety of interconnection structures are then described. Finally, the paper reviews the current work being undertaken with respect to the higher layers of the ISO OSI architecture.     

Use of a formal description technique in the specification of authentication protocols

Formal specification techniques have been employed over the past decade or so by various workers in data communication and computer network systems in order to provide both definitional specifications of protocols and models of protocols for analytic purposes. This paper considers the use of the specification language LOTOS (Language of Temporal Ordering Specification) for specifying some authentication protocols developed in the security field. The language LOTOS recently became an International ISO Standard and the protocols specified form part of the ISO and CCITT Standards. In fact, the CCITT protocol which is considered in this paper, has been used in the LOCATOR (X.400 Secure Mail) project within HPLabs. We first give a brief introduction to LOTOS and then specify two security protocols from ISO/DP 9798 and CCITT X.509 Standards. We feel that a formal specification of protocols is a useful and a necessary step towards understandability, analysis and implementation of the protocols. Further, we feel that LOTOS possesses the necessary features required for specifying such protocols.     

A datagram-based network architecture for microcomputers

Current developments in protocol standards for local area networks are not suitable for small microcomputers with limited storage and processing capability. A suitable distributed systems architecture that is based on datagrams is presented. Compatibility with the ISO/CCITT seven-layer OSI model is maintained where possible, and internetworking is supported.     

一种TCP/IP网络与LonWorks网络的集成方案

针对TCP/IP网络与LonWorks网络互操作和集成的需要，该文给出了一种进行两类网络集成的方案——“LonTalk-TCP/IP”集成方案，并详细叙述了此方案的实施步骤。方案基于ISO/OSI参考模型进行设计，采用DDE技术和客户机/服务器模式实现。方案简单实用，具有良好的开放性和可扩展性。     

Development of CCITT standards for packet data networks in the period 1980–1984

The rapid growth of the communications industry has produced the need for a programme of rationalization of international computing and networking standards. The work done at CCITT in this field during 1980–1984 period is reviewed, particular attention being given to the progress made in the standards for packet data networks: X.25, X.3, X.28, X.29 and X.32. Some aspects of the OSI model that are related to the network layer and to X.25 are also discussed.     

IPv6服务质量控制机制

该文详细给出了 ＩＳＯ ＯＳＩ、ＣＣＣ和 ＡＴＭ服务质量（Ｑｕａｌｉｔｙ ｏｆ Ｓｅｒｖｉｃｅ,ＱｏＳ）的概念,介绍了 Ｉｎｔｅｒｎｅｔ ＩＰｖ６对ＱｏＳ的控制机制。