| Personalized learning education philosophy emphasizes the respect and attention to students’ individual differences,help students get rid of heavy academic burden and promote their all-round development.At present,with the development of information technology,the application of cognitive diagnosis technology in actual teaching process has greatly improved the degree of individuation of teaching.Cognitive diagnosis is an improvement and perfection for traditional test and evaluation.This technology can diagnose students’ knowledge status in real time during the test process,so as to realize personalized teaching.However,the cognitive diagnostic test is still unable to accurately calibrate the difficulty of the test items and learners’ ability,which greatly affects the accuracy of the diagnostic results and the individualization learning.In order to solve this problem,based on the comprehensive analysis of domestic research status,this study is guided by personalized learning theory and modern educational measurement theory.constructs the text push model adapted by students’ ability level for cognitive diagnosis on the basis of Rasch model.First using Rasch model to logarithmic transformation the original data of test question bank,calibrate the difficulty level of the test and the learner’s initial ability level in the same isometric ruler.Then,learners with different ability levels are pushed corresponding difficulty level test questions in the test process,the learner’s ability level was then updated immediately after each test to provide evidence for the next cognitive diagnostic test.Finally,the stable ability level of learners and accurate diagnosis report of cognitive state can be obtained by asking students to answer the least number of test questions,so as to improve the learning efficiency of students.In order to verify the effect of the model in the application of personalized teaching,this paper selects the “Java language program design” as the teaching content,the text push model adapted by students’ ability level for cognitive diagnosis is applied to the actual teaching,carries out the teaching practice of three stages based on Rasch model,namely,the calibration of learners’ initial ability and the difficulty level of test questions,the push of ability level adaptive test,and the remedial teaching based on the diagnostic results.The results of research show that the ability level adaptive test push model for cognitive diagnosis can make the difficulty of test questions pushed by the system accurately match with learners’ ability,further improve the accuracy of cognitive diagnosis,and promote the development of education towards individuation. |
