Intelligent Question and Answer System Based on Course Knowledge Graph

With the development of time, online education such as catechism is widely used, and it is difficult to meet the personalized learning needs of learners because of the difficulty of timely communication between teachers and students while breaking space and time. The intelligent question and answer system integrating subject knowledge can meet learners' knowledge retrieval and personalized learning and make up for teachers' lack of energy. Currently, intelligent question and answer systems based on knowledge graph are receiving attention from researchers in the education field, however, Chinese knowledge graphs for university courses and intelligent question and answer systems based on them are lacking. To address this problem, we propose to construct a Chinese course knowledge graph and design and implement an intelligent question and answer system based on the course knowledge graph. The main contributions of this paper are as follows. Firstly, we designed and implemented an intelligent question and answer system based on the method of building templates. Then, we have classified the knowledge of the Introduction to Database Systems course, clarified the attributes and relationships of the knowledge points, and constructed the course knowledge graph. Finally, an external evaluation method was used to collect 30 questions asked by undergraduate students for systematic testing, resulting in 80% satisfaction. The experiment results indicate that the system can answer user questions more accurately and help learners improve the efficiency of independent learning, while giving practical support to the development of knowledge graph intelligent question and answer applications in education.