The Analysis Design And Core Realization Of Virtual Reference Real-Time Consultant System

During the period of the 10th five-year plan of 211 Project, Beijing University of Posts and Telecommunications (BUPT) developed independently a service system of a digital library with BUPT characteristics, which includes six sub-systems, such as Virtual Reference Consultant System (VRCS),Information Portal,Unification Resource Retrieving,Digital Resource Management,Dissertation Submission and Network Information Collecting, and these six sub-systems are integrated with each other. Virtual Reference Consultant System is divided into two parts, real-time Consultant and non real-time Consultant. The contemporary VRCS of BUPT only had the text communication module in the real-time part, the real-time function is very simple, so it can't suit the consulter's requirement. So according the practical requirement of the real-time of VRCS and referencing the VRCS of the world, writer designed one VRCS which has the complete function, and expanded the function and technique of every module. Audio and video communication is the virtual face to face consult, and it is the key point for implementing the real real-time consult system, so writer implemented the audio and video consult module which contains real audio and video communication function,audio and video record function,audio and video presentation function, mainly using the technology of Java media framework (JMF) and RTP. For reaching the zero rejecting rate of VRCS, basing the hand dispatch strategy and Java technology, this paper implemented the dispatch module, solved the problem of consulter dispatch, and realized the collaborative reference consult further. The implemented modules above all have the cross-platform, B/S framework and multi-point communication characteristics.Finally, writer concludes the whole developing procedure, and expand on the future developing tendency of VRCS.