This paper presents a task model for real time systems and gives the conditions that guarantee periodic and aperiodic tasks to be schedulable respectively.

提出了一种实时系统任务模型，分析了该模型中周期和非周期任务可调度的条件，并给出了一种强实时非周期任务的可预测调度算法。

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Real-time tasks are divided into periodic tasks and aperiodic tasks, Since two kinds of tasks have different missed feature, it is must to use the different analysis method.

实时任务分为周期任务和非周期任务，由于两类不同任务的超时特性不同，因而分析方法也不同。

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Based on the concept of synthetic utilization of aperiodic tasks, an online task scheduling algorithm is designed to schedule security-sensitive aperiodic tasks with minimal security risk.

在分析非周期实时任务可调度性的基础上，提出一种基于处理器瞬态利用率、系统安全风险最小的在线调度近似算法。

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