Abstract: Concerning the dynamic evolution and QoS requirement problems of embedded application systems, an embedded component model - ESIM model was outlined. The dynamic evolution method of the ESIM model was discussed, including the evolution strategy and process, and the discussion stressed the check of the dynamic evolution request according to the QoS layer contract, the evolution contract and the resource consumption information. Simulation results show that the dynamic evolution system of the ESIM is better for solving the state transmission, resources occupation and realtime ability problems, as the duration and resource consumption of the evolution are predictable.

Key words: embedded system, component model, contract, dynamic evolution

摘要： 针对嵌入式应用系统的动态演化和QoS需求问题，提出了一个嵌入式构件模型——ESIM，并进一步说明了该模型动态演化的策略和过程，着重强调根据构件的QoS层契约、演化契约、资源的消耗信息来检查动态演化请求。仿真实验表明，ESIM的动态演化系统较好地解决了演化过程中的状态传输、资源占用和实时性等问题，演化过程的持续时间和资源消耗量是可预知的，并且满足实时性约束。

关键词: 嵌入式系统, 构件模型, 契约, 动态演化