Realization Of Evaluation & Feedback System In Intelligent Exam System

Intelligence Computer-assisted Instruction (ICAI) is a main stream of today CAI application and development. As one of the most important part of ICAI, the evaluation and feedback system is given recognition by people more and more. But now the research of the evaluation and feedback system is still in junior phase, we will improve the intelligence and accuracy of the evaluation and feedback system.Basic on the analyze and research of the evaluation and feedback system, this paper demonstrate an intelligence method of the evaluation. In this foundation, take the Zhejiang University adult education institute distance learning project as the background, has realized an new and intelligent evolution and feedback system.The system involved five models: test-questions data base management model, component test paper model examination model, judgment and analyzing model, grade management model. During the process of the problem research, mainly exploring the statistical former of test-questions difficulty index verify in the test-questions data base system. The test-question's comprehensive evaluation factor which is considered as the principle of test paper grouping has been increased a database library, a novel database related to the intelligent test system before has enhanced the efficiency and quality of test paper grouping. The arithmetic former of test-questions difficulty distributing is in random select problem. The former of test-questions scores given besides parts of the former was realized. During the judgment and examination, in order to evaluate whether the students have attended the requirement of the education aim, bring out the education and judgment model depending on the signal-noise ratio, and done the principium research on the math about its application.The exploitation of system was done on the operation flat of windows 2000, One the stage the enable-visibility condition of PowerBuilder is used, import the object-oriented design method, while the background database used the connection database of SQL Server, so these tools software help the design and realize of the examination and evaluation system. Some arithmetic of the evaluation former isrealized by the C++ langue, through interface application in the PowerBuilder, so the more flexible three layer application structure come true.