优化

Based on the special decomposition of Hankel matrix, we can transform the problem of approximating a given matrix with a positive semidefinite real Hankel matrix of lower rank to a smooth unconstrained optimization problem.

对矩阵的低秩Hankel半正定矩阵逼近，采用特殊的分解形式，可将其转化为一个无约束的优化问题进行求解，本文应用拟牛顿方法求解无约束优化问题。

Structure and convexity can be destroyed if it is left to the solver to perform the matching.we could loose the positive semidefinite matrix with an arbitrary matching of the free variables.

这一方法的思路就是把优化问题简化成优化条件，这样求解相对变得容易。不过问题也就出在这，这一转化需要很强的假设条件。

However, conventional design, crash simulation and experiment can only improve the structural crashworthiness to some extent, which can not assess the reliability of design parameters and the robust of objective function, at the same time, nor achieve a global optimization performance subjected to the preassigned probabilistie constraints.

耐撞性的优化涉及材料与结构的众多参数，传统的确定性优化设计、碰撞仿真及实验往往只能在一定程度上改善结构的碰撞性能，而无法评估设计参数的可靠性和目标函数的鲁棒性，以及在给定可靠性约束条件下使目标函数的鲁棒性达到最优状态。

The method to optimize observatory distribution is very important to direct the optimization of earthquake precursory observatories.

文中所用的优化方法对于指导地震前兆观测台站的优化具有一定意义。

Based on current situation of multi-analysis for the exploitation, utilization, management of water resources, after studying domestically prevalent MAPGIS system, Water Resources Optimization Management Decision Support System for Hengshui City has been developed, helping to solve series of relative problems in optimum allocation,plan prepotency, decision making, etc.

在全面分析衡水市水资源开采、利用和管理现状的基础上，在系统研究国内较为成熟的MAPGIS系统的情况下，开发了"衡水市水资源优化管理决策支持系统"，以解决水资源管理过程水资源优化配置、方案选优、规划决策等一系列问题。

This algorithm decomposes the primal problem into several sub-problems solving parallel which reduces the size and complexity of the optimization problem.

辅助问题原理建立了一个用于分布式并行优化的计算框架，各分区可根据具体情况自主选择优化算法。

The inventory cost is a primary component of the supply chain cost,and the method for multi-echelon

库存成本是供应链成本的重要组成部分，要进行供应链成本的全局性优化和控制，必须采用多级优化与控制方法。

With the fact that this type ship has more principal dimension parameters than the normal ships,a principal dimensions optimization method was developed.

针对该型船主尺度参数众多而不易优化的问题，提出了一套主尺度优化方法。

Examples have been calculated by use of parameter optimization inverse program.

根据田间实测数据采用开发的参数优化反求程序进行了实例计算，分析比较了采用不同目标函数的结果，结果表明，采用第三种目标函数进行计算，优化结果最理想；并用这些结果与设置相同目标函数的离散变量算法和试算法的结果进行了对比，结果显示，三种算法所得结果没有明显差异。

The interval parameter back analysis program is developed based on the flexible tolerance method.

基于可变容差优化反分析法，开发了区间优化反分析程序。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。