Design And Realization Of Network Teaching Question-Answer System In Distribution Environment

Without any constraints of time and space, Network Teaching solves many problems which traditional education can not solve. It has important meaning for education. But Network Teaching also has some problems. Without the face to face communication and teacher's constraints, students often encountered all kinds of questions. So the question-answer system must be an important part of the network teaching platform, and its research and realization can promote network teaching positively.Understanding system requirement deeply is very important to design an effective and standard network teaching Question-answer system. This thesis provides the reasonable requirements by combining usual Question-answer system requirements and network teaching's special requirements. This system contains asynchronous Question-answer function, real-time Question-answer function, searching question function, the intelligent guidance function, and also the system considers the synchronous update of the resources in distributed sites as an important requirement.There are three difficult problems in realizing process, which this thesis research in detail. First, how to search questions effectively. By researching Lucene which is searching engineer develop tool library, this thesis proves Lucene has many advantages and is a good choice to realize searching. Second, how to make system guide students study intelligently. This thesis researches expert system and provides a feasible solution. third, how to update resource libraries in disturbed sites. This thesis gives a realize method by using web service.There are many excellent open-sources J2EE development framework constantly emerges, which provided a powerful support for development. This thesis describes how to design Question-answer System based on J2EE. Through our efforts, network teaching Question-answer System basically completed and received good results, which prove the feasibility of the relevant technology solutions and design.