The Design And Realization Of The Chinese Agricultural Web Page Search System Based On SDD

As the existence of Digital Divide, getting agricultural information was very difficult, especially for the enterprise , department , farmer which desired the agricultural science information and market information mostly, but in these grate capacity information they used the traditional integrate search engine, not only searching an accurate information war difficult but also they got many not relevant information .For changing this developing an special search engine was very necessary, so according the Chinese web page .developing an special search engine about agricultural to realize the accurate search was the thesis start point.Through the analyze of research background , the "two theme shift " search model was issued .The full-text and semantic retrieval technology was introduced in detail, the method which is based on the SDD semantic retrieval technology was mentioned on that .Then the experiment system was built to validate the capacity of improved SDD on large scale documents and feasibility of "two theme shift" model which took the advantage of a hundred thousand records which come from ten theme data base of the National Agricultural Science Center. At last, we introduced the design and realization of Chinese Agricultural Web Pages Search System Based on the SDD, including construction , functions and running in action. The main results:(1) Researching and practicing the "two theme shift" model, efficiently improve the experience of user search application.(2) Analyzing the SDD arithmetic, finding out the bottle-neck and looking out the improvement method.(3)Building the experiment system based on the SDD and validating the feasibility on large scale documents and "two theme shift" model.(4)Designing and realizing the Chinese Agricultural Web Pages Search System Based on the SDD.