权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

A study on Document Delivery System in Electronic Library Systems

电子图书馆系统中文档传送系统的研究

基本信息

批准号：
03452292
负责人：
ADACHI Jun
金额：
$ 4.03万
依托单位：
National Center for Science Information Systems
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452292/
关键词：
Electronic Library Information Retrieval Database TCP IP FDDI ISDN LAN Document Delivery IP デ-タベ-ス

项目摘要

The aim of this research was to investigate the feasibolity of electronic library systems, especially socusing on telecommunication system for the document delivery on high-speed wide area networks.An electronic library in this investigation is defined as a new information service by which a user can retrieve pages of scientific journals directly on his/her workstation through networks from the centrally located detabase server that stores a large amount of digitized image data in its database systems.To establish such a new information system, we were required to estimate how a user can make access to the database server through conventional wide-area networks and what is the actual performance of various communications systems.The details of investigation are as follows : i) (communication protocol) We extended the standard ANSI Z39.50 protocol, which is designed for text information retrieval, in order to facilitate image data transmission, because we were required to apply special treatment for image data which tends to be large. We implemented the extended protocol in our experimental system. ii) (Connection through FDDI and ISDN) We investigated the communication method on low-speed 64kbps ISDN circuit as well as high-speed 100Mbps FDDI local area network. The result was incorporated into the design of user interface and interaction between a server and clients. iii) (user interface) We implemented user interface software for retrieval of secondary information and image data as well as a prototype server system for an electronic library. iv) (system evaluation) Based on the prototype system, we estimated the network performance requirement for a full-fledged electronic library system for scientific and engineering documents. The investigation could reveal design parameters for high-volume data transmission required in the future electronic library systems.

本研究的目的是探讨电子图书馆系统，特别是利用远程通信系统在高速广域网上进行文献传递的可行性。本研究中的电子图书馆被定义为一种新的信息服务，用户可以通过网络从其数据库系统中存储着大量数字化图像数据的中央数据库服务器上直接在他/她的工作站上检索科学期刊的页面。为了建立这样一个新的信息系统，我们需要评估用户如何通过传统的广域网络访问数据库服务器，以及各种通信系统的实际性能如何。调查的详细情况如下：i)(通信协议)我们扩展了标准的ANSI Z39.50协议，该协议是为文本信息检索而设计的，以便于图像数据的传输，因为我们需要对倾向于大数据量的图像数据进行特殊处理。我们在实验系统中实现了扩展后的协议。(Ii)(通过FDDI和ISDN连接)研究了低速64kbps ISDN电路和高速100 Mbps FDDI局域网上的通信方法。结果被融入到用户界面和服务器与客户端之间的交互的设计中。(Iii)(用户界面)我们实现了用于检索二次信息和图像数据的用户界面软件，并为电子图书馆实现了一个原型服务器系统。(4)(系统评估)在原型系统的基础上，我们估计了一个成熟的科学和工程文献电子图书馆系统的网络性能需求。这项调查可能会揭示未来电子图书馆系统所需的大容量数据传输的设计参数。