并行查询优化器的目标是缩减庞大的计划搜索空间，获得优化的查询规划。
The key problem is how to prune the big search space in order to get an optimized query plan for query parallel optimization.
针对交通规划的特点和目标，介绍一种基于最优化原理和GIS空间分析方法的交通站点规划方法。
According to characteristic and aim of traffic planning, this paper introduces an approach which is based on GIS spatial analysis and optimization theory.
为制定合理的混凝土桥面板维修策略，提出一种基于折衷规划的多目标优化方法。
This paper presents a multi-objective optimization approach based on compromise programming to optimize concrete bridge deck maintenance policies.
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