引入关联缺陷的软件可靠性评估模型

摘要

关联缺陷的存在很大程度上是由于缺陷的检测能力被其他缺陷所屏蔽,它不仅影响软件测试结果,还扭曲了软件可靠性评估模型的评估结果.从软件缺陷的自身角度来分析软件检测以及可靠性评估失效的原因,对关联缺陷进行了详细分析.为了在软件可靠性评估时获得更符合实际缺陷数量的预测值,将广义关联应用于现有可靠性评估模型的改进上,并提出了P-NHPP(phase-nonhomogeneous poisson process,简称P-NHPP)可靠性模型.实验分析表明,P-NHPP具有较好的拟合效果和预测能力.%Mostly, defect correlation is caused by the defect detected capability masked by other defects. Defect correlation affects the result of the test and makes the results in accurate and distorts the estimated results of software reliability assessment models. From the standpoint of defects themselves, this paper makes a detailed analysis of defect correlation and gives the reasons of the software testing and reliability assessment out of action. By applying the generalized correlation to improve the existing reliability assessment models, this paper puts forward the P-NHPP (phase-nonhomogeneous poisson process) reliability model to make the reliability assessment parameters more coordinated with the actual defect number. Experimental results show that P-NHPP is better and has a fairly accurate prediction capability.