Development of Network-Oriented High Performance Workstation

国家科学信息系统中心(NACSIS)的主要职责之一是编制大学图书馆藏书和丛书的联合目录数据库。现已提供基于X.25的全国范围内的网络，用于图书馆与NACSIS的连接。通过这个网络，编目人员可以访问NACSIS数据库，并将数据交互地放入数据库中。因此，有必要提供屏幕数据传输和数据下载的设施，以及面向屏幕的用户友好界面。图书馆网络软件最初是在大型机上实现的。然而，图书馆网络的快速扩张是不可预期的，因为小型图书馆很难引入大型机。此外，大型机上没有用户友好的界面。因此，开发具有网络功能和良好用户界面的小型编目工作站已成为当务之急。本课题的目的是实现一个网络化的…更多面向ORK的工作站适用于编目任务。首先，我们设计了网络协议规范，作为整个系统的基础。屏幕传输协议是用于在主机和终端之间传输复杂数据库记录的应用层协议。该协议还加入了数据库记录的下载功能，减少了网络软件的工作量，同时实现了用户友好的界面。设计的VTSS协议基于CCITT X.28，简化了通过PAD与X.25网络的连接。上述协议的第一个原型软件在Unix操作系统上实现。该协议规范是为计算机制造商提供的，以促进在各种计算机系统上的实现。目前，已有5家厂商提供VTSS协议软件用于图书馆应用。对这些系统进行了性能评估，并对软件进行了修改，提高了响应时间。该项目的成果为日本图书馆网络的扩展和服务改进奠定了基础。较少

One of the major roles of the National Center for Science Information System (NACSIS) is to compile the union catalog database of books and serials held by university libraries. Nationwide network based on X.25 is now provided for the connection of libraries and NACSIS. Through this network, catalogers access NACSIS database and put data into the database interactively. Therefore it is necessary to provide the facilities for screen data transmission and down-loading of data as well as screen-oriented user-friendly interface.The software for library network was originally implemented on mainframe computers. However, the rapid expansion of library network could not be expected, since it was difficult for small libraries to introduce mainframes. moreover user-friendly interface was not available on mainframes. Thus, it was an urgent issur to implement small cataloging workstation which equips network facilities and good user interface as well.The aim of this project is to implement a netw … More ork oriented workstation applicable to catalogin tasks. First, we have designed network protocol specification as a basis of the whole system. The screen transfer protocol is the spplication level protocol for the transmission of complicated database record between host computer and terminals. Down-loading function of database record is also included in this protocol.We tried to reduce the workload of network software, as well as the implementation of user- friendly interface. The designed 'VTSS protocol' is based on CCITT X.28 for simplified connection to X.25 network through PAD. The first prototype software of the above mentioned protocol was implemented on UNIX operating system. The protocol specification was disclosed for the computer manufacturers to promote the implementation on various computer system. At present, five manufacturers provide VTSS protocol software for library application. The performance-evaluation was also done for these systems and the software was revised to improve response time.the fruits of this project is the basis of the expansion and service improvement of the library network in Japan. Less