The article describes the selection for the information retrieval system for Chinese patent literature,which includes the architacture,the developed tool ,the user interface,the system performance and the data integrity in the environment exchange of software and hardware.

Any long field based on index database compressed by many methods of compresses. The size of the index file has been decreased and the fast seek on indexed field has not been influenced. The system behaves compare and priority functions.

The conventional retrieval algorithm used directly the arithmetic expressions ignores its retrieval operation features and has the low searching efficiency.This paper presents a new method in which a query expression is expanded according to the rule of operation before it's executed .It will increase the efficiency because this method does not only reduce the number of operations but also abridge the temporary files in which the intermediate results to be stored.

After analysing the DIALOG system' s databases,authors present 3-forms of entering databases and the corresponding retrieval methods of chemical formulas.

The paper discusses the necessity and feasibitity of the shift realizing research strategy; analyses the difficulties and the methods.Finally,some suggestions are proposed.

This paper use the Peking University Library Catalogue Access Server as an example,expound the main idea and technique gists in the design of server program based on the Client/Server computing model. This article primarily consists of three parts: (1) The introduction of APT system;(2) An overview of Client/Server computing model and RPC; (3) Peking University Library Catalogue Access Server (PUL SER).more detail techniques of server design is presented in part three.

The article introduces the international standard ISO10160 and ISO10161 on the interlibrary loan protocol in the OSI environment and especially discusses the service model and definition of electronical ILL and the transmission of electronical documents.

The functions and properties of multimedia author tools in multimedia information system are discribed in this paper,the functions and implementations of "Multimedia Toolbook" are introduced in detail.

In the first part of this paper,the authors introduce features and support technologies of a multimedia system.Process of developing a multimedia information system is outlined.lmpacts of multimedia technology on library are pointed out in the second part,which show it is inevitable that multimedia technology will be applied in library more and more in the future.

In this article, the information proccessing technologies and methodologies used in the development of the TOTALS integrated library automation system, which including networking database, information retrieving, and other techniques, are introduced. These technologies and methodologies are not only advanced and efficient to the development of library information systems, but also available to the applications of other network information system.

The paper gave a brief view of GLIS(General-purpose Library In tegrated System) ,a popular library automatiom system based on DOS and LAN operation system.Features of the system on special DBMS created for MARC data format,event driven user interface,data flow among the sub-systems,concept of user reconfigurable control files were discussed.

The electric power-supply distribution and environmental equipment are key problems for the normal operation of the library computer network system.Based on the field work,the author of this paper proposes some techniques to tackle the mentioned problems in the construction and the library computer network system.