基于队列网络模型，由化学抽象机中形式化描述的软件体系结构规约，导出了一种性能评价模型。

Then the paper derives a performance evaluation model, based on a Queueing Network Model, from a software architecture specification formally described in Chemical Abstract Machine.

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从数据库构建、属性数据库和空间数据库、路面使用性能评价模型等方面比较详细地介绍了路面管理系统。

Pavement management system was described in detail from the establishment of database, attribute database, spatial database, evaluation model of pavement performance and so on.

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文中详细分析了它们的带宽、延时性能与数据流量和数据缓冲区的关系，给出了机群机间通讯系统的性能评价模型。

The models to evaluate their performance are given and then equations listed which tell the relations of bandwidth, latency, flow rate and buffer sizes.

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