基于模糊折中规划的稳健多目标优化设计

针对稳健设计目标函数与波动之间的冲突及协调问题,提出了一种基于模糊折中规划的稳健设计多目标优化方法. 该方法在考虑工程稳健设计中大量存在的模糊因素的前提下,建立目标函数以及波动的隶属度函数,利用模糊偏好分配每个目标的权重从而均衡目标函数值和波动之间的平衡. 该方法将决策者的偏好充分体现到决策过程中,从而得到决策者所期望的折中解. 从实例结果可以看出,模糊折中规划适合于求解稳健优化设计问题.     

基于Pareto解的交互式模糊优化及其应用

设计参数内关外联的属性和设计约束的模糊性、相关性和传播性往往导致多目标优化设计中冲突发生和目标间协调性差等现象。针对这些问题,应用模糊数学原理,构造尺度函数,增加附加约束,并基于Pareto解处的冲突矩阵、协同灵敏度分析以及目标重要度阈值的交互选择,建立了基于Pareto解的模糊交互式多目标优化模型。结果表明:提出的模型在兼顾主、客观要求的前提下,可降低目标之间的冲突程度,得到最大的满意度。以实例验证了模型的有效可行性。     

基于有限理性的船型方案优选

在考虑决策者的有限理性的基础上解决船型方案优选问题.首先,详细分析了船型方案优化和优选问题的特殊性及当前研究中待解决的问题;其次,基于人的有限理性的特点,引入偏好设计理论和前景理论,从数学角度定性、定量描述决策者的决策偏好和决策心理;基于偏好设计理论,生成表征设计者偏好的船型方案Pareto解集,利用前景理论编辑决策者的决策风险偏好,基于Pareto解集进行船型方案优选;再次,以理性数值分析为参考,基于决策者的预期效用对数值分析结果进行修正,得出符合实际决策情景的最佳船型方案.最后,通过算例分析验证了方法的有效性.     

基于随机优化的工程稳健设计

根据影响产品质量的因素,讨论了质量设计的准则和设计解的稳健性,并利用随机建模原理提出一种工程稳健设计的新方法。该方法与一般稳健设计不同的是,通过同时调整设计参数与控制其容差来达到稳健设计的最优解。数值分析表明,该方法是十分有效的。     

非对称模糊优化设计问题中的约束稳健性研究

一般非对称模糊优化设计数学模型中,设计变量按名义值处理,未考虑可控因素和噪声因素对模糊约束条件稳健性的影响,不能对模糊约束条件满足水平的波动实行有效控制.根据稳健设计原理,提出了模糊约束条件的容差型稳健性准则;把该准则应用于模糊优化设计,提出了基于约束稳健性的模糊优化设计方法,提高了模糊优化设计解的可信度和工程使用价值,并给出了设计实例.     

两连杆桁架设计的多目标优化算法

针对两连杆桁架的多目标最优化设计问题,提出一种利用遗传算法和模糊理论来求解多目标优化问题的Pareto最优解算法,并通过实验进行验证;讨论遗传算法和模糊理论产生Pareto最优解的差异.结果显示:通过遗传算法配合近似分析的方法可以更有效率地寻找到更多的Pareto最优解.     

基于物理规划的履带起重机变幅系统多目标优化

履带起重机变幅系统具备足够的承载能力实现臂架俯仰,是整机的重要组成部分.通过分析变幅系统构件受力特点,建立了变幅系统力学和多目标优化模型.采用物理规划方法,基于构件极限荷载定义偏好函数,建立了综合优化评价函数.设计多目标混沌遗传算法求解问题,根据Pareto支配概念和精英策略保留较优解,并采用混沌局部搜索避免了过早收敛.算例分析表明,提出的方法可以优化构件间的几何关系且减小构件受力,对履带起重机总体参数设计具有指导意义.     

非对称模糊优化设计问题中的约束稳健性研究

一般非对称模糊优化设计数学模型中,设计变量按名义值处理,未考虑可控因素和噪声因素对模糊约束条件稳健性的影响,不能对模糊约束条件满足水平的波动实行有效控制。根据稳健设计原理,提出了模糊约束条件的容差型稳健性准则;把该准则应用于模糊优化设计,提出了基于约束稳健性的模糊优化设计方法,提高了模糊优化设计解的可信度和工程使用价值。并给出了设计实例。     

基于物理规划的模糊稳健优化设计

为了改进提高产品性能稳健性的工程设计方法,将稳健设计中的容差和所要达到的优质品率作为两个目标函数,建立了模糊稳健双目标优化设计模型,并应用物理规划方法进行求解。通过对齿轮传动装置装配尺寸链的稳健优化设计,给出了具体的分析求解过程。实例表明,该文所提出的方法是可行的。     

模糊多目标两人零和博弈的Pareto策略

利用Sakawa模糊目标函数研究了多目标两人零和博弈Pareto最优安全策略. 在分析模糊多目标Pareto策略性质的基础上,提出了该策略的确定方法. 证明了当博弈达到Pareto均衡时模糊多目标向量函数满足的等价条件,该条件体现了博弈均衡受到局中人模糊偏好的影响.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that