关键词: 安全关键系统, 调度特征, 模糊分类, 敏感度优先, 实时调度模型

Abstract: The development of IoT and WSN may take more applications into safety-critical systems.But those applications have different characters with traditional safety-critical systems，such as medical systems，nuclear power systems and aeronautical systems.Study on scheduling characters of non-traditional safety critical systems is carried on in this paper.And great differences are founded between the non-traditional and the traditional，especially on itemization of tasks.It will cause many problems while applying existing scheduling models to those applications directly.Scheduling characters of non-traditional safety-critical systems are set up.A real-time scheduling model and MSF algorithm to meet those characters，where tasks are fuzzy itemized and the algorithm includes two steps to schedule tasks ordered by sensitity.Finally，a feasibility analysis and a test on the non-taxable system of Changsha city are taken.The result shows that MSF holds better performance and less failure number of tasks than MUF.

Key words: safety critical system, scheduling characters, fuzzy itemized, sensitity, real-time scheduling model