机械设计类外文参考文献及翻译 第7页
it can be used to develop Websites on a desktop system and deploy then on secure Servers such as those found commonly only running UNIX or Linux. The PHP drawbacks that we have found are predominantly in its weak abstraction for Databases (each Database backend is accessed through a different interface. In other words, PHP is limited to using a small handful of free Database APIs, none of which are compatible with each other), underdeveloped library mechanism (lacking Peril’s true ‘‘module’’ concept) and occasional linguistic quirks [42].
In response to ASP, Sun Microsystems gave the world Java Server Pages (JSP) technology, which is based entirely upon Sun’s popular Java programming language and gives developers the advantages of developing in Java in a more relaxed, script-like environment. JSP is a better solution generating dynamicWeb pages in contrast to ASP, PHP, and CGI. Together, JSP and Servlets provide an attractive alternative to other types of dynamic Web scripting/programming that offers platform independence, enhanced performance, separation of logic fromdisplay, ease of administration, extensibility into the enterprise and most importantly, ease of use [43]. JSP/Servlets has been widely applied by many electronic commerce providers such as the famous E-Business. EJBtJSPtServlets are almost to be a standard of developing electronic commerce. Hence, it is a better decision to develop dynamic Web pages by JSP and Servlets.
6.3. Constructing development platform
The running and development environment of JSP and Servlets is especially complicated. The running
and development framework of JSP and Servlets is described in Fig. 7. The application development platform is shown in Table 2. The development kits of application are reported in Table 3. Figs. 8–11 illustrate the Home page,Web page for manufacturing service, Web page for remote STL checking, and Web page for client management. The web page for user interface of online pricing engine (OPE) in Internet Explorer 5.0 and a case of online quote are illustrated in Figs. 12 and 13 respectively.
7. Case study
To illustrate exactly how the service system works and the benefits it can bring to the users and servicebureaus, an actual example is now presented. Let us assume that a company was working on a new design of the curing coryza apparatus for which a number of physical models would be required. The model was purely for the purpose of design visualization and would be used as a means of communication with other functional departments in the organization. The task requirement and relevant resources were submitted to SB by the job management module of the service system. After receiving the job requirement, the system would firstly perform the process planning by which the job was to be decomposed into the 3D CAD modelling and making prototype, and SL wasselected as the most suitable process for building the mock-ups through the ‘‘RP selector’’, while the service system offered the preliminary product quote and manufacturing time for the user. Accepted initially such results, the user continued to negotiate further with SB by Video-conferencing system. Once a commercial, a contract was to be confirmed in the end. Subsequently, the 3D CAD modelling and prototype making were assigned to the Shaanxi Productivity Promote Center and Chongqi Productivity Promote Center respectively to complete. Finally, the green parts would be checked online and delivered to the end user. The detailed workflow is represented in Fig. 14. The result of process planning is reported in Table 4. The 3D CAD models submitted by the Shaanxi Productivity Promote Center are illustrated in Fig. 15. The mock-ups fabricated by the Chongqi Productivity Promote Center are shown in Fig. 16. In contrast to the traditional development mode, it can cut the new product costs by up to 50% and the timeto- market by 75%. Consequently, the costs and lead times are substantially reduced using this service system to develop new products.
8. Conclusions and future research
In order to meet the current demand of rapid product development, a novel integrated system of rapid product development based on rapid prototyping is proposed, and a networked service system which offers better support for the rapid product development of small and
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