基于D-S理论的学生行为评价模型的研究

针对目前学生行为评价方法的可区分度较小、可信度低、方法单一的状况,综合运用了D-S信息融合技术,基于证据推理提出了一种新的学生行为评价模型。D-S理论是一种典型的不确定性推理和信息融合方法,它适用性强,应用广泛,能很好地表示和处理学生行为表现的不确定性信息。证据的基本可信度分配和不确定度的提取采用了函数映射的方法,在预先设定的门限条件下,采用基于基本可信度分配的决策方法进行评价结果的判定,使评价目标的不确定度大大下降,可区分度明显得到了提高,学生行为的评价结果明显得到了改善,从而增强了评价的可信度。

A Study on the Model of Students' Behavior Assessment Based on Evidence Theory

For solving the problems of undistinguished difference, low reliability and simple method in students' behavior assessment, the technique of D-S information fusion is integrated into the new model for students' assessment based on evidential reasoning. D-S theory is a typical technique of uncertain reasoning and information fusion, and it's widely utilized for good applicability. The uncertain information of students' action is well described and processed with evidence theory. The method of function mapping is introduced to obtain Basic Probability Assignment and the uncertainty of evidence through evidential reasoning, and the decision rule based on Basic Probability Assignment is adopted to determine the result of assessment under the condition of previously given thresholds. The data of operation demonstrate that the uncertainty of objects declines greatly, and students are separated more distinctly. The degree of reliability increases and the result of assessment of students' behavior is improved.