Based on the theory of random effectiveness and urban traffic network, a random model used for computing average travel time in a road network is established.

以随机效用理论为基础，建立了整个路网中车辆在路网容量极限状态下的平均行驶时间模型。

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Finally, the simulation design of an example of DRES: "driving control and monitoring system of car" reveals the effectiveness and merits of message architecture model and time-accounting measure.

最后，通过对分布式实时系统实例“汽车行驶监控系统”的模拟设计，表明了消息体系模型和时间记账机制的有效性及优点。

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T he effectiveness of interval velocity time-depth conversion processing is mainly dependent on the correctness and rationality of the built velocity model of ti me-depth conversion.

层速度时深转换处理的效果，主要取决于所建立的时深转换速度模型的正确及合理性。

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