在飞机设计各阶段中，任务定义阶段、概念设计阶段和初步设计阶段的综合优化设计对提高飞机整体性能具有极其重要的意义。
In mission definition stage, conceptual design phase and preliminary design phase, multidisciplinary optimization is especially significant for improving integration performance of aircraft.
本文引入有向图的特征多项式、反图、对称闭包等概念。初步探讨它们与图的某些整体性质的关系。
In this paper, the concept of the characteristic polynomial, the converse graph, the symmetrical closure and others are defined.
代概念的引入是为了提高垃圾收集器的整体性能。
The importing of generation concept is to improve the performance of garbage collector.
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