邮电通信对信息化适应问题浅析

信息化是社会发展的必然要求，适应信息化的要注是邮电通信发展的一个基本目标。本文采取国际上较为通用的分析方法研究了中国邮电通信对信息化的适应程度，并结合通信发展中现存问题对今后发展提出应引以注意的方面。     

A comparison of lost pattern casting processes

Commercial casting processes in which the pattern is consumed in the process have recently seen the addition of the evaporative (or foam) pattern process, and hybrid processes which combine features from both lost wax and foam pattern. The technical and economic constraints which apply to each process are compared and the capabilities, advantages, and limitations of each are discussed.     

A tableau approach to power system analysis and design

The tableau formulation of electronic circuit equations has been shown to be an efficient and useful formulation for circuit optimization. In this paper a tableau based formulation of the static power-flow equations for a power system is presented. Because of the explicit appearance of all quantities of interest the tableau formulation allows the general statement, and solution, of a variety of power system optimization and design problems without the need to resort to restrictive assumptions.     

VLSI: linking design and manufacturing

A set of computer-aided design (CAD) tools that predict the effects of various manufacturing steps along with the chip's internal dimensions is described. Called the Process Engineer's Workbench, the system predicts the chip's characteristics, their statistical distribution, and the manufacturing yield likely from any one fabrication process. The tools are even sensitive to the small random variations that increase in significance as devices shrink in size. Workbench can be used to compare its programs' predictions and those of other software tools with actual measurements of devices and processes. Some existing CAD tools are reviewed to highlight the Workbench's advantages, and the features of the latter are examined. Written in C language for a Digital Equipment VAXstation, Workbench was designed to be portable and runs on several other popular workstations. It contains two basic libraries, namely, one of device models, the other of process step models     

电信发展阶段的网间接续费

世界各国电信体制的改革，使电信业从垄断走向竞争，由此相发的现有公司电信网和新公司电信网的网间接续费问题成了电信主管部门面临的重要课题。本文合成阐述了网间接续费的概念及内涵，特别强调了处于发展阶段的电信网和网间接续费的特点。