【正文】 and reliability analysts can analyze the reliability of the system more quickly and conveniently. ? 1998 Elsevier Science Ltd. All rights reserved.KEYWORDS: Information system, WWW, client/server architecture, reliability1. INTRODUCTIONInformation systems are used in many practical applications and sometimes it is very useful for decision making. The accepted notion for the information system is that it should model the flow of information in a given organizational structure. In reliability engineering, researchers are faced with several difficult tasks in accessing and analyzing data. Most data are accumulated in the system development site apart from the reliability analyst39。藉由系統(tǒng)開發(fā)，設(shè)計(jì)工程師和可信度分析家可以更為方便快捷地對(duì)系統(tǒng)的可靠性進(jìn)行分析。互聯(lián)網(wǎng)發(fā)展成為了支持交互式數(shù)據(jù)顯示及分發(fā)的傳輸手段。Lyu(1995)論證了客戶端/服務(wù)器結(jié)構(gòu)的四項(xiàng)優(yōu)勢(shì)：成本降低、生產(chǎn)率提高、系統(tǒng)生命周期較長以及更好的可用性。在一個(gè)基于CGI的系統(tǒng)中，所有通常由客戶端處理的任務(wù)必須由CGI程序模擬。3. 系統(tǒng)實(shí)施 電子電信研究所(ETRI)開發(fā)了叫做ERIS的可靠性信息系統(tǒng)。大多數(shù)現(xiàn)有工具都是獨(dú)立的，用戶之間共享數(shù)據(jù)非常不方便。只有擁有唯一正確的用戶識(shí)別號(hào)碼(ID)和密碼的用戶才能進(jìn)入數(shù)據(jù)庫服務(wù)器。一旦他/她的ID在用戶數(shù)據(jù)庫注冊(cè)，他/她能夠在任何地方下載ERIS客戶端程序。COM是管理數(shù)據(jù)請(qǐng)求的聯(lián)系進(jìn)程。通過結(jié)合互聯(lián)網(wǎng)和繼承客戶端/服務(wù)器結(jié)構(gòu)的概念，我們?cè)谠O(shè)計(jì)引擎的范圍，建立了可迅速理解的可靠性設(shè)計(jì)環(huán)境。ERIS同樣可以通過互聯(lián)網(wǎng)為其他組織提供服務(wù)。只有認(rèn)證用戶及信息數(shù)據(jù)才可以被注冊(cè)。他們通過利于服務(wù)器的原始客戶端處理專用應(yīng)用功能。該系統(tǒng)分為以下兩類：用戶/數(shù)據(jù)庫管理和可靠性分析。同時(shí)他對(duì)理解分析結(jié)果是非常有幫助的。ERIS的客戶端程序包括由兩個(gè)中立程序組成，他們處于不同的硬件平臺(tái)：工作站以及個(gè)人電腦上。另一種從標(biāo)準(zhǔn)互聯(lián)網(wǎng)瀏覽器獲得客戶端/服務(wù)器應(yīng)用的方法是由Dossick和Kaiser發(fā)明的。隨著互聯(lián)網(wǎng)的發(fā)展，實(shí)現(xiàn)客戶端/服務(wù)器結(jié)構(gòu)的最簡單的方法，就是在客戶端軟件的任務(wù)不過是顯示及格式化從服務(wù)器取得的信息時(shí)使用網(wǎng)絡(luò)瀏覽器。同樣，在發(fā)展客戶端與服務(wù)器軟件或網(wǎng)絡(luò)協(xié)議時(shí)，如果沒有要求特殊資源，基于互聯(lián)網(wǎng)的系統(tǒng)可以迅速被創(chuàng)造。一般認(rèn)為，信息系統(tǒng)是構(gòu)建在某一特定組織結(jié)構(gòu)模型數(shù)據(jù)流程。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 platform, workstaion and personal puter. It was inconvenient to the users who are not familiar with UNIX environment. The special requirements for reliability soft39。s ID is registered to user DB, he/she can download ERIS client program anywhere. The client programs of the ERIS are implemented as windows programs. They handle applicationspecific functions that the original clients handled on behalf of the server. They have a more easytoaccess and userfriendly interfaces which supplies a good foundation for incorporating reliability studies into the design process. The munication between server process and client process for the request of the standard ponent data is made through typical TCP/IP. Figure 1 shows the bined s