The concept、characteristics、functions an d construction of electronic library are introduced in this paper.The related te chnologies and problems of electronic li brary are also discussed.
This paper is intended to examplify the electronic reading materials and electro nic libraries which have emerged in the global context since the 1990 s.The auth or begins with a description of the resp ective features underlying the mono med ia/multi media electronic publication an d the electronic library,then shifts to the network and the information super hi ghway,and fi nally concludes with such examples as of multi-media reading room,optical-disk-networking and on-
line searching database, Internet searching and networking in the library of Tsinghua University,to illustrate the applications of electronic publications to the field of publishing information in China.
This paper analyzes the curre nt level of integrated information netwo rk in the world,including network connec tion,network mutual operation,and distri bution application etc.involved in netwo rk integration,and introduces the state of the art of techniques of open systems ,LAN interconnection,enterprise network, client/server system and the application and future development trends of integr ated information network.
The article discussed that choose and fit of software and hardware in netw ork of library automatic system.the method of LAN environment design in library automatic system by NetWare were described.
Analysed the shortcomings in curre nt database construction. Listed the adv antages of full text database.Asserted t hat under network conditions,its not a wise method to publish those retrieval p eriodicals.Paid length on the possibilit y,the conditions of computer system,the work of library stuff members,and possib le problems in the full text database constr uction.Concluded that its time to estab lish a wide range full text database.
This paper discusses necessity and feasibility of exploitation tool fo rdocument database system.It describes basic design thinking,data structure and functions of database system produced by the tool.
This paper introduces the distribu ted database systems and analyzes their general architecture and characteristics .Two problems including data distributio n and query optimization are discussed.The author also hold that,with the social development and the progress of the network communication technology,distributed database systems will be applied more extensively.
Besides brief description of its overall designing thoughts,main character and m ain functions of the model for full text to be loaded into database and indexed and searched,the three indexing patterns suiting the needs of indexing and estab lishing database in its different stages are made a focus on this paper. For the first time the auther put forward the a utomatic weighted indexing pattern,which is mainly based on the indexing result and the post-controlling result studied
automatically to bring abot the vocabulary for extract ion indexing acumulated and perfected automatically. Meanwhile, the other important problems, including the compu ter-aided abstract ing and the automatic forming post-controlled retrieval strategy and so on, are expounded briefly too.
In this paper,the traditional meth od of weighted retrieval and the method of Boolean retrieval are discussed and compaired overall.And the defect of the traditional method of weighted re trieval is pointed out.The author suggests a progressive approach of weighted retrieval,which comprehends advantages of the traditional weighted retrieval and the Boolean retrieval for the most part.
s.The method is based on the statistical analysis of Chinese characte r frequency.
This article deals with the total qualit y control of the library and evaluation on its automatic system so as to raise t he level of the library automation.
The paper gives a minute description on some ideas related to the expert system study and designing of Chinese geological reference classification.The aim is to introduce the expert system i nto Chinese geological reference classification and lay a foundation for the expert system application in the field of Chinese geological reference classificati on.
In the application of Fox series relation database,it is still problem that how to store unfixed length data in a fixed length field database,and how to retriev e any key word under the title.some programming skills which can solve above problems successfully are introduced in this paper.
The article put forward the practical and feasible design plan to build sound picture reading room,and explain by drawing how equipment install and joint.
