采用多目标、多约束的优化方法，以悬臂施工主梁的斜拉桥为例，建立了施工阶段的优化模型，并给出算例。
Based on the cable-stayed bridge using method of cantilever, the paper establishes the optimization model of construction phase with multi-objective and multi-constraint and gives the example.
在保持公司特征同质性的基础上，本文选取民营公司作为研究对象，使用主成分构建对经营者的约束水平。
On the base of the same characters, we choose private companies as the object of analysis, construct the restriction level about the managers by principal component analysis method.
针对R-C系统的特点，考虑轴外渐晕的影响，推导出主、次镜内遮光罩尺寸设计的约束公式。
The constraint formulas for designing the geometries of primary baffle and secondary baffle are deduced when taking account of vignette of R-C system.
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