优化

Taking a heavy truck cab as the example, a model of the spotweld space based on finite element was built to analyse the torsional stiffness of the model, and the amount and layout of the spotweld using the discrete variable topology optimization were optimized. Comparing with the original model in welding spot's number and the torsional stiffness, the optimized model has less number of welding spot, but the torsional stiffness of the two model is almost the same.

以某重型卡车驾驶室为例，在有限元模型基础上建立焊点空间模型进行扭转刚度分析，并采用离散变量拓扑优化方法对焊点的数量及空间布局进行优化，通过优化前后的对比可知，优化后在不降低扭转刚度的同时减少了焊点数目。

After the optimal design, some parameters of the impeller such as entrance angle and diameter and have been changed. The improved impellers efficiency and cavitation performance are better than the former one.

通过对叶轮入口处的流场分析，证实了该泵性能下降是由汽蚀造成的推测；基于速度系数法建立了叶轮优化的数学模型，通过得到的流场数据和该数学模型对原叶轮进行了优化设计，优化结果对叶片的入口角和叶片的入口直径等参数进行了改进，优化后的叶轮达到了提高泵的汽蚀性能和效率的目的。

The evenness of floor's surface temperature is the condition for technical optimization of floor structure.

在技术优化地板结构的基础上进行经济优化，以最小投资费用为优化条件，得出地板的技术经济优化结构。

The principle of Immune Genetic Algorithms, the modeling, and calculation processes are introduced, and the optimization calculation of the mathematical model of pile driver vibrator of flood control is carried out by application of the method.

这些算法的共同之处是都属于随机优化方法，是一种非确定性的优化方法，与确定性的优化算法相比，非确定性算法的优点在于它有更多的机会求得优化问题的全局最优解。

The principle of particle swarm optimization are presented and the algorithm is applied in optimization design unusual type spirally fluted tubes.

介绍了粒子群优化算法的原理，并将粒子群优化算法应用于异型螺旋槽管的优化设计，针对不同的设计目的，制定了不同的目标函数进行优化。

Then, the effects of configuration parameters on performance of inlet/forebody were discussed in detail according the database built during optimization, and the result shows the cowl parameters and isolater height have more important effect on the general performance of inlet/forebody.The analysis method was developed to evaluate the performance of scramjet combustor in direct-connect test.

建立了进气道/前体性能评估方法，采用渐进优化方法在全空间和缩减空间内对进气道/前体进行了两轮优化，优化效果比较显著；根据优化中建立的数据库，深入分析了各构型参数对进气道/前体性能的影响，结果表明外罩构型参数和隔离段高度对进气道/前体综合性能有相对较大的影响。

Perspective of the thesis is from the social development and enterprise progress, to enhance competitive advantage of technological enterprises as the goal, describe the necessary to resolve the issue of the organizational structure by a comparative analysis, as well as in practice, optimization of the organizational structure has practical significance, the thesis is on the basis of optimization analysis of organizational structure of Shenzhen MG technology company, and uses the four-cycle perspective to describe the cyclical dynamic reconfiguration of the organization optimization problem, through the planning, startup, diagnosis, design, reconstruction, monitoring , as well as steps to improve the optimization of organizational structure, provide a new way of thinking and problem-solving approach to improve the efficiency of organization for similarity technology enterprises.

本文从社会发展、企业进步的视角出发，以提升科技企业竞争优势为目标，阐述了解决企业组织结构问题在理论上的必要性，以及组织结构优化在实践中所具有的现实意义。本文在对深圳MG科技公司组织结构现状进行分析的基础上，采用四循环法这种以周期性的观点描述企业动态组织优化问题的方法，通过策划、启动、诊断、设计、重构、监控、以及改进等步骤逐步实现对深圳MG科技公司的组织结构优化，所得的研究成果为类似科技企业进行组织结构优化提供了新的解决思路和方案。

The dissertation focuses on performance gradient estimation and SRO algorithm of DES aswell as other related topics,such as modeling of DES and discrete event simulation,performancemeasure Hessian matrix estimation,Stochastic Approximationand so on.General Semi-Markov Processis adapted to describe behaviour of DES and discrete eventsimulation.A general result is obtained and applied to analyze strong consistency of performancegradient Perturbation Analysisestimator.Conditions for effectiveness of InfinitesimalPerturbation Analysisare also discussed.New PA algorithms,such as server PA,PA usingDirac generalized function,job sequence PA etc.,are proposed to deal with discreteparameters.Furthermore,strategies of combining PA algorithms with certain iterative rules areanalyzed widely in order to optimize DES parameters and some SRO algorithms are constructed toslove DES optimization problems.

论文将DES性能分析领域中性能梯度估计和单运行仿真优化作为主要的研究对象，探讨了与性能梯度估计有关的DES和离散事件仿真过程建模、高阶导数估计以及随机逼近等理论和方法；建立了具有一般性的DES和离散事件仿真的广义半Markov过程模型；获得了分析性能梯度估计量强相合性的理论结果和无穷小摄动分析算法应用的条件；提出了诸如服务台数目的摄动分析、奇异摄动分析、串联生产线和加工车间中工件加工序的摄动分析等一系列摄动的思想和算法，对连续参数和离散参数都进行了深入的研究；对摄动分析算法同优化规则结合实现仿真优化的策略也进行了广泛的分析，构造了新型的变界截尾的随机逼近算法，并用于DES的单运行仿真优化研究；最后，给出了DES性能分析方法的实证性研究结果。

First, the basic concept of VR and review of the present research method of architecture presentation are introduced, it proves that VR is necessary and reliable to represent architecture as a new method. Second, geometrical optimized method and texture optimized method are discussed specially, along with the analysis of characteristic of ancient and modern architectures. In the third part, the exhibition effect of optimized technique proved that the technique proposed in this dissertation is feasible and valid, which is applied in the Grand Leshan Buddha and Olympic Park separately.

全文分三部分，第一部分主要通过对虚拟现实基本概念的介绍和对已有建筑表现应用研究的简要回顾，阐明VR作为建筑表现新手段的必要性与可行性；第二部分则具体分析古代建筑与现代建筑特点，深入探讨几何优化建模与纹理优化建模；第三部分别结合乐山大佛古建筑群仿真案例与平度奥林匹克现代建筑仿真案例展示优化技术效果，充分证明本文提出的优化建模技术的可行性与有效性。

The DFP method is proved a officient one in processing unconstrainted optimization problem, so in this thesis, used the idea of mechanical structural optimization for reference analytically and extended modified formula of DFP—matrix to shape optimiation the DFP—Hamilton function method is put forward.

由于变尺度方法是有效的无约束优化方法，本文在分析的基础上借鉴了机械结构参数优化的思想，并将变尺度矩阵的修正公式扩展至形状优化中去，进而提出了变尺度—H函数极值法，并用其解决了梁、柱和复杂曲面的形状优化设计问题，取得了较好的效果。

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。