考虑非理想排错过程的软件可靠性模型-《计算机技术与发展》

文章信息/Info

Title:: A Model of Software-Reliability with Imperfect Fault Correction Process

Author(s):: ZHENG Lei; SHEN Yuan-long; Institute of Electronics Science and Engineering,Nanjing University of Posts and Telecommunications

Keywords:: software reliability model; fault correction process; fault correction rate function; fault introduction rate function; fault correction time

摘要:: 经典的可靠性模型排错过程是理想的,没有考虑各种实际情况。实际的排错过程并不是完美的,错误排除需要时间,且不可能完全排除,排错过程中可能引入新的错误,错误排除率和错误引入率均是随时间变化的函数等等。文中针对这些排错过程的实际情况,对Xuemei Zhang等人提出的软件可靠性模型进行了改进,提出新的假设,建立改进的新模型,给出模型的一般表达形式。并通过两组公开发表的失效数据,对改进后模型的一个特例模型的拟合预测能力进行仿真分析比较,最终验证了改进的考虑非理想排错过程的软件可靠性模型的优越性,说明了新模型更符合现实的软件可靠性活动过程

Abstract:: The classical models,which were based on ideal fault correction process,ignore the effect of the realistic fault correction process.In fact,the realistic fault correction process is not perfect.The fault can not be corrected immediately after it be detected,and the fault introduction and removal efficiency should be considered.The fault removal rate is not constant,but depends on time.In this paper,considering the actual impact of fault correction process,some new assumptions are proposed ,and a new improved model based on the software reliability model which was proposed by Xuemei Zhang is created. Some simulation experiments are carried out in the new model and selected ones with two set of software failures data which were openly published. Through analyzing and comparing one of the improved model,it ultimately proves the superiority of the improved prediction model,and the new models is more suitable to be used in actual software reliability process