信息高速公路是长远战略目标

沸沸扬扬的信息高速公路热仍在我国继续着,这表明中国期望抓住这一世纪之交的关键机遇,加速我国信息基础设施的建设,缩小与发达国家的差距。那么,美国为什么提出信息高速公路的动议?国家信息基础设施和信息高速公路究竟要达到什么目标?它们具有何种内在联系?发达国家与发展中国家实现NII这一长远战略目标将面临哪些挑战?如果我们能把这些问题探讨得深入一些,把握信息高速公路的内涵,既高瞻远嘱,又脚踏实地,我们的战略部署、决策和工作就会建立在科学和扎实的基础之上。 为此本刊特约近期访美归来的总蝙雷震洲先生对上述问题发表看法、阐述观点,以深化对信息高速公路这一课题的研讨。     

二十一世纪通信发展走向

本文展望了２１世纪初社会、家庭、企业对通信的需求与通信在信息化社会中的重要地位，指出通信事业经营者应向社会提供什么样的通信业务（服务），应建设什么样的通信网来实现这些业务以及未来的网络需要哪些关键性通信技术来支持。     

Equipment selection and justification through total productivity model

Traditional methods of economic analysis to justify equipment selection and use are based on several methods such as the Net Present Value, Break-Even Analysis, Pay-Back Period, Return on Investment, among others. However, with the introduction of automation, Flexible Manufacturing Systems (FMS), and Computer Integrated Manufacturing Systems (CIMS), such economic analyses have often resulted in decisions that management did not like to support but did not have much choice to avoid on account of pressure from manufacturing engineers, design engineers and others in the operations areas. The real problem of equipment selection and justification lies in the methodologies used.

This paper presents a unique approach to equipment justification by applying Sumanth's TOTAL PRODUCTIVITY MODEL, whereby the anticipated impact of the proposed equipment on profitability is assessed from the point of total productivity and the five partial productivities. Then, only if the equipment increases the total productivity level beyond its break even point, the equipment is selected or justified.

This method offers a non-traditional approach to justifying and selecting equipment in all types of environment. A numerical example is presented by using LOTUS 1-2-3^TM on an IBM PC. Advantages and limitations to this approach are discussed to provide a balanced perspective on the important issue of equipment selection and justification.     

The International Energy Agency photovoltaic power systems implementing agreement

Motivations, objectives, and specific achievements and progress of the first five years of activities of the IEA Photovoltaic Power Systems Co-operation Programme are summarized. A brief input of the activities starting now or planned for the future is also given.     

A micro computer decision support system for the total-productivity model (TPM)

The Total Productivity Model (TPM), developed by Sumanth in 1979, has been applied to a number of situations involving manufacturing as well as service-oriented operations. The diversity of applications on the one hand, and the flexibility of usage of the microcomputers on the other hand, have helped to focus the need for a micro-computer based Decision Support System (DSS). This paper presents such a system using the Macintosh Computer. This DSS is a highly interactive, menu-driven program that can provide on-the screen capabilities of individual operational units as well as the firm that comprises of them. The system has several convenient features to assess the “PRODUCTIVITY- ORIENTED PROFITABILITY” of any type companies/organizations. The system logic and flow chart, data input and output formats, and sensitivity analysis will be shown and discussed in the paper. A balanced critique will be offered to view the system in a proper perspective with respect to structural elements of the Decision Support System.     

电信市场开放后政府的管制倾向

综合来讲，世界各国对电信行业的管理大致在三个层次上进行：最高政府决策管理层、准政府管理层及民间层。面对电信网络设备的管理主要有强制性管理和非强制性管理两种方式。本文在最后指出了国外电信行业管理的趋势。     

利用高性能同时采样ADC降低高级电力线监测系统的成本

人们对电力需求的增长以及节能意识的增强使得全球在电力传输基础架构领域的投资迅速增长,这也带动了高级电力线监控系统在单相和多相应用中的市场,使其成为新一代智能电网的关键技术。随着对系统性能的要求越来越严格,设计人员开始在电力线监测或多通道SCADA(管理控制和数据采集)系统中关注同时采样、多通道、高性能ADC的使用。