Design And Implementation Of Heterogeneous Learning Resource Library Fusion And Cross Database Retrieval

In recent years,with the continuous development of computer network technology,more and more users tend to find the resources they need on the network.To some extent,this phenomenon has promoted the development of all kinds of learning resources based on Internet.At the same time,there are more and more systems have been developed for different types of learning resources.In this case,if users want to search for a resource,they have to log on to each retrieval system frequently.It not only spends a lot of learners' time,but also the efficiency of the whole retrieval process is very unsatisfactory.Through the design and implementation of heterogeneous learning resource library fusion and cross database retrieval,this thesis provides a unified retrieval platform for users.The platform provides a unified retrieval entrance.The user only needs to log in once,and can be transparent,one-stop search for the information resources in different resource libraries.First of all,this thesis studies the current situation of heterogeneous learning resource library fusion and cross database retrieval technology at home and abroad.It concludes that there are three ways to achieve resource fusion and cross database retrieval.Based on the above background,this thesis briefly describes the related theories and main technologies,and provides theoretical and technical support for the detailed design and implementation of the following system.Secondly,this thesis puts forward the key mechanisms and strategies of cross database retrieval technology to realize heterogeneous learning resource fusion.The specific solution mechanisms and strategies are given in three aspects:distributed heterogeneous data source aggregation,retrieval command conversion oriented to multiple data sources,and fusion of retrieval results and optimal processing of reordering.Thirdly,the overall architecture and functions of the system are designed.The details of the implementation of the data source management module,the search scheduling module and the result processing module of the main modules of the system are described.Then,a prototype system of cross database retrieval for heterogeneous resource fusion is implemented.Finally,the test environment is introduced.The system is tested and the results were analyzed.The feasibility of the system is verified,and it has certain practical value.