204b基于web的科研信息管理系統(tǒng)的設計外文文獻翻譯-文庫吧
2024-11-14 07:21 本頁面
【正文】 r. Section 2 provides a brief overview of WWW applied to the client/server puting. Section 3 introduces the implementation details of the reliability information system. And the conclusion and further study will be discussed in Section 4.2. WWW AND CLIENTSERVER ARCHITECTUREClient/server architecture can be explained as the relationship between two processes that are cooperating to perform some tasks. R supports the scalability and the integrity of an information system. Lyu (1995) discussed the four benefits of the client/server environment such as lower cost, higher productivity, longer system life cycle, and better usability. Therefore, the client/server system architecture is considered as a feasible framework for information systems. With the advent of the WWW, the most easiest way of implementing the client/server architecture is to use web browser where the client so ware does nothing more than display and format information retrieved from the server. Several kinds of retrieval system for bibliography are the representative examples. By using a web browser as the platform for client to access an existing client/server system, only one set of code(the HTML and helper code) for the system needs to be maintained. But in the case of other systems, where the client software performs additional tasks on behalf of the server or the users, the mediator is needed to perform this work for the web browserbased clients. The typical solution is to use mon gateway interface (CGI) programs. But this method is unsatisfactory for various reasons. With a CGIbased system, all work, normally done by the client, must be emulated by the CGI programs. Therefore it adds more load to the server machine. Another approach of accessing client/server applications from standard WWW browsers was made by Dossick and Kaiser. They suggested a scheme to use a HTTP proxies as a method of connecting an existing client/server system to the web. This HTTP proxy intercepts HTTP requests for data and transforms them into requests for the legacy system using its native protocols. It is possible to use browserspecific tools like Netscape39。s PlugIn APIs to create web browser based clients for client/server systems. However, using these APls limits the use of the resulting webbased client sofivcare to specific platforms and specific web browsers. This is an unnecessary limitation which negates many benefits of creating a webbased client.3. IMPLEMENTED SYSTEMElectronics and Telemunications Research Institute(ETRI) has developed the reliability information system called the ERIS. It puterized the calculation of the ponent failure rates and the reliability of a plex system. The client program of the ERIS consisted of two independent programs having different hardware pl
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