Storage and synchronization for distributed continuous media

Advances in local area ATM networking make it possible to integrate digital audio and video, or continuous media (CM), into distributed computing environments. The temporal nature of CM introduces new requirements for acceptable end-to-end delay and jitter. This and an increased demand for bandwidth affect the design of modern, general purpose, operating systems. This paper addresses distributed system support for CM applications, focusing on the design and implementation of facilities for secondary storage and synchronization. We describe the relevant issues, along with details of our research project and its relationship to existing work. We emphasize experimentation and present results obtained with a prototype in an ATM testbed. These provide fresh insights into the role of operating system support for multimedia.     

异构分布式文件系统GSHDFS名字服务的设计与实现

名字服务是异构分布式文件系统的核心部分．在参阅国内外众多分布式文件系统的基础上，提出一种新的命名方案──输出共享方式，在保留原文件系统命名语法的前题下，将本地文件系统与远程文件系统有机地结合起来，并采用混和的分布方式实现了名字服务员，达到了位置透明性要求．     

基于边界码的非Manhattan格式下的文本图象的自动区域分割方法

随着网络和通信技术的发展，电子图书馆逐渐发展为信息检索和资料提供的重要途径。非Ｍａｎｈａｔｔａｎ格式的排版方式因具有形式自由，富于变化的特点而得到越来越广的应用，但是对于非Ｍａｎｈａｔｔａｎ格式的文本图象的自动区域分割的研究还只是停留在实验的水平，迫切需求一种快速实用的自动区域分割法方法提高电子图书馆的文献录入速度 。     

Computational Aspects of Pathology Image Classification and Retrieval

We are investigating the role of high performance computing for support of a comprehensive pathology image atlas. The primary computing component is a database access mechanism providing retrieval by content based image matching (CBIR) along with traditional term based queries. An organization based on information theoretic and Bayesian principles using decision trees and signature files is being developed. The essential role of HPC is the discovery, selection, and optimization of medically useful image feature sets via genetic algorithm and simulated annealing methods. This paper outlines the problem area along with aspects of the underlying theoretical basis and distinguishing computing characteristics. Efficiency of key portions of the computations can be greatly improved by using parallelism within the computer word length using bit counting instructions to implement voting and multimedia style instruction sets for low level image processing.     

一种波形音频文件压缩的实现

描述了波形音频文件的格式，提出了一种压缩波形音频文件的方法，给出了压缩依据和压缩结果，最终的结果表明压缩方法是可行的。     

Practical experience with OS/2 installable file systems

The installable file system (IFS) faculty on OS/2 offers an efficient mechanism for expanding the abilities of the OS/2 kernel. Two prototypes illustrate the usefulness of the IFS facility. An OS/2 port of the Andrew File System (AFS) allows users to access global community files while retaining the private local file system on the OS/2 machine. An IFS implementation of a network protocol mapper, which maps TCP/IP socket calls to SNA Advanced Program-to-Program Communication (APPC) calls, provides the ability to run any socket program on an APPC network after simply re-linking with the mapping library. The only impediment to the development of these prototypes is the lack of kernel-level interfaces to operating system devices, resulting in time-consuming data movement back up to the user level to access the network and the local disks. This impediment will disappear as OS/2 and its associated support software matures.     

基于UNIX双域名邮件系统问题的一种解决方案

一个企业的信息网通常只有一个域名,但往往由于某些无法回避的原因必须两个域名同时并存使用的情形也是存在的。只使用一个域名时邮件系统的构建是容易的,两个域名同时并存就会给邮件系统的构建带来地址不一致等问题。文章探讨了两个域名同时并存使用时如何进行邮件系统的构建,提出了构建双域名邮件系统带来的地址不一致问题的解决方案及其实际应用情况。     

VisualFoxPro6.0在焊工档案管理中的应用

介绍了焊工档案管理系统建立的全过程。焊工档案管理是锅炉压力容器行业中焊工管理所必须的，焊工档案管理系统包括对焊工档案的查询、更新及输出等功能。VisualFoxPro6．O具有强大的数据库管理功能，所以我们选定VisualFoxPro6．0实现焊工档案的管理。     

一种新型编译器开发工具的原理及快捷使用

由美国Archelon公司开发的可重定位编译器开发工具———RetargetableCompilerDevelopmentTools是一种新型的集成化编译器开发工具,它可以为有特殊硬件结构和指令的目标机器开发高级语言编译器。应用该工具,不需要编写传统的词法分析、语法分析等各阶段程序,只需在熟悉目标机器的指令结构、硬件机制的基础上编写编译信息文件和机器定义文件。这里将分析该工具的工作原理,并提出使用该工具的快捷方法。     

影响移动式显示中文文本阅读理解的主要因素

移动式显示方式是一种视觉显示终端（ＶＤＴ）上常见的动态显示方式。文章通过３个实验室实验研究了影响移动式显示方式下中文文本阅读理解的３个主要因素：移动速度、显示窗口长度和移动步幅。３３名大学生被试分别参加了３个实验。结果表明，移动速度对阅读理解是至关重要的因素，并且与显示窗口长度呈现出一定的交互作用趋势；移动步幅不影响中文的阅读理解。