Design And Development Of Online Diagnosis Results Visualization System Based On Educational Knowledge Graph

Driven by the strategy of "Internet+Education",online education has been develop-ing continuously,and a large number of online learning platforms have emerged.However,most online learning platforms still adopt the traditional teaching evaluation method.It is difficult to accurately reflect the knowledge state of learners,and accurately locate the weak knowledge points of learners only by test scores.It is unable to substantially help teachers improve teaching and help students carry out personalized learning.At present,educational knowledge graph can reflect the relationship between subject knowledge points and has a better ability to organize,manage,visualize subject knowledge and learn-ers’ knowledge state.It can help online learning platforms to better realize individualized teaching and personalized learning.Based on the above situation,this paper designs and develops an online diagnostic system based on an educational knowledge graph,taking the junior middle school mathe-matics knowledge map as an example,to accurately obtain the knowledge acquisition sta-tus of middle school students in online learning and visualize the knowledge status of stu-dents.In this study,learners’ knowledge state is diagnosed according to learners ’test data.Combined with the existing knowledge graph,learners’ knowledge graph is obtained and visualized,and the diagnostic data is intuitively fed back to teachers and students.Teachers and students can find the weak points of learners according to feedback results and the relationship between knowledge,to carry out targeted teaching and learning.The specific work of this paper is as follows:(1)Demand analysis of online diagnosis results visualization system based on the educational knowledge graph.Aiming at the problem that learners’ knowledge state is difficult to obtain and feedback timely and accurately in online learning,combined with the advantages of cognitive diagnosis,knowledge graph,and visualization,it is clear that the system needs to meet the needs of online learning users to understand learners’knowledge state timely and accurately and locate unknown knowledge points.(2)Design and implementation of online diagnosis result visualization system based on the educational knowledge graph.Based on system requirement analysis and software development theory,the overall architecture,system database,and functional modules of the system are designed.According to the system requirements and system design,the integrated use of existing technologies to complete online learning,online testing and di-agnosis,knowledge status visualization,and other functional modules.By calling the di-agnostic program written by R language in the test interface,the function of online learning user real-time diagnosis of knowledge state is realized.In the knowledge state visualization module,the color scale in D3 can not meet the needs of the system,so the color function is written according to the need to realize the change of node color according to the students’knowledge state,which meets the needs of intuitively showing the students’ knowledge state and the relationship between knowledge.(3)Test of online diagnosis results visualization system based on the educational knowledge graph.After the completion of the system,the compatibility test,functional test,and performance test of the system are carried out to verify that the system function has been realized,the performance is stable,the expected effect is achieved,and can be used normally.