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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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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Both periodic tasks such as information acquisition, control, data communication and aperiodic tasks such as arising from arbitrary critical events must be completed within their deadlines.

系统不仅需要保证数据采集、控制、传输等周期任务在确定时间内完成，也要保证突发事件等非周期任务的及时响应。

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