基于算术平均贴近度的加权几何平均组合预测

引入和讨论了基于算术平均贴近度的加权几何平均组合预测模型及其性质.针对该模型定义了非劣性组合预测模型、优性组合预测模型以及组合预测冗余度的概念,讨论了在一定条件下,该组合预测模型存在非劣性及优性组合预测的条件,给出了判定冗余组合预测方法的判定定理.通过实例分析说明了基于算术平均贴近度的非线性组合预测模型的有效性.     

混联机械系统组合方式广义特征状态方程

提出了混联机械系统组合方式分析的新的广义特征状态方法. 定义了多个机构单元的串、并混联等组合方式及其典型组合单元的数学模型,并以基本组合方式为基础,建立其对应的广义特征状态模型(集),提取了不同组合关系下的广义特征状态方程,从而建立起组合方式数学表达式. 讨论了不同组合变化对应广义特征状态方程的计算方法及其变化规律,分析了组合关系的重组计算及功能传递方式,采用分层特征模式并结合定性数学知识建模,实现了把复杂机械系统的组合方式问题转化为广义运动特征矢量间的组合计算问题,继而构建组合系统运动变换的广义特征状态组合模型来传递输入输出特征,为其运动方案综合的选型及分解计算提供了参考模板,为混联机械系统的分析及特征建模提供了一种有效方法.     

基于L-V生态模型的项目组合风险研究

针对项目组合风险,构建了基于L-V生态模型的项目组合风险预测模型;探讨了两项目组合风险系统平衡点性态和稳定性条件,用专家评分法给出项目组合风险权重值,得到两项目组合风险值,分析了随时间变化,两项目组合风险变化趋势;用Matalb数学软件数值模拟算例,验证了该模型有效性.     

基于L1范数的加权几何平均组合预测模型的性质

提出了基于L1范数的加权几何平均的组合预测模型,针对该模型定义了优性组合预测、预测方法优超和组合预测冗余度等新概念;指出模型的任一个可行解对应的组合预测至少是非劣性组合预测, 探讨简单等权平均组合预测方法为最优性组合预测方法和优性组合预测存在的充分条件;论证预测冗余信息的可能存在性并给出冗余预测方法出现的一个判定定理.最后进行了实例分析,结果表明该方法是一种有效的组合预测方法.     

遗传算法研究证券组合投资的有效边界

基于遗传算法,搜索了证券组合投资中不同风险约束下的最优收益率的大小,实证研究了证券市场证券组合的有效边界曲线．另外给出了不同证券组合可能导致的组合风险和组合收益率的上下限．文中采用适当的方法,对原始数据进行预处理．     

基于图形转换的组合状态安全性验证技术

受制于系统状态组合爆炸,并发系统的组合状态验证一直是困扰模型检验的难题。基于图形转换的组合框架,研究了该框架的组合状态安全性验证技术。采用Petri网模型构造系统组合框架,分析出组合系统可达状态空间与部件可达状态空间的包含关联关系,提出了组合状态危害等级分类模型,设计出组合状态可达性分析方法和层次化多级安全性验证算法,并实例应用于轨道交通列车控制系统的功能安全性验证。     

基于向量夹角余弦的几何平均组合预测研究

加权几何平均组合预测为一种非线性的组合预测方法．提出基于向量夹角余弦的加权几何平均的组合预测模型,针对该模型定义了优性组合预测、预测方法优超和组合预测冗余度等新的概念;探讨了非劣性组合预测和优性组合预测存在的充分条件;给出了一个冗余预测方法出现的判定定理．     

基于IOWHA算子和倒数灰关联度的组合预测模型及其应用

将诱导有序加权调和平均(IOWHA)算子和倒数灰关联度相结合,提出了基于IOWHA算子和倒数灰关联度的组合预测模型,同时定义了优性组合预测和非劣性组合预测的概念,并将该组合预测模型应用到税收收入预测中,验证了组合预测模型的合理性和有效性,并说明了优性组合预测的存在性.     

人力资源管理的策略组合

本文在对比人力资源管理单一策略和组合策略的优缺点的基础上 ,阐述了人力资源管理组合策略的作用以及具体策略组合的内容 ,这些策略组合包括内部招聘和外部招聘组合、社会招聘和校园招聘组合、人力资源流动模式策略组合、内在激励和外在激励的组合、效绩激励和技能激励的组合、个人激励、团队激励和组织激励的组合、工作系统设计模式策略组合等。     

关于钢-混凝土组合结构设计的一点思考

介绍了钢-混凝土组合结构的类型和优点,阐述了钢-混凝土组合结构的设计要点,并分析了各种组合结构水件的特点,为钢-混凝土组合结构的设计提供借鉴和参考。     

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