可变模糊集方法在辽宁省生态环境承载力评价中的应用

本文收集了辽宁省近8年的数据作为研究对象,选用反映辽宁省生态环境承载力评价的有关指标数据,用可变模糊评价方法构造了辽宁省生态环境承载力评价模型,并兼顾主观经验和客观信息的综合赋权法,采用最小二乘法优化决策模型计算主客观组合权重,对其水环境质量进行综合评价,结果表明：辽宁省生态环境承载力整体水平较高。     

组合赋权法在节水灌区综合效益评价中的应用

尝试采用组合赋权法对云南灌区综合效益评价指标体系进行赋权.该方法通过结合两种典型的主客观赋权方法,而后求解模型得出灌区综合效益评价各指标的最终权重值.分析计算结果不难发现,应用组合赋权法获得的指标权重全部介于主、客观赋权法之间,说明其从一定程度上克服了两种权重的片面性,从而也使综合评价结果愈加科学合理.     

基于集对联系数和可变模糊集的起重机金属结构安全评价

针对起重机金属结构安全评价时确定相对隶属度的不足和最大隶属度原则不适用的问题,提出了以组合赋权法和可变模糊集理论相结合的评价方法。该方法将评价指标的评分结果转化为评价向量,依据可变模糊集理论中的相对差异度函数确定相邻两级指标的相对差异度;利用层次分析法和信息熵法分别确定起重机金属结构的主观和客观权重,运用集对联系数融合主客观权重;由组合权重和相对差异度矩阵确定综合相对隶属度,并通过变换组合参数进行综合评价,同时经计算得到评价对象的安全等级;最后,以某造船门式起重机金属结构变形缺陷的评价为例,验证了该模型的合理性和可行性。     

基于主客观赋权的企业专利组合质量评价

为解决质量视角下企业专利组合的评价问题，结合三角模糊数、多目标优化法和两阶段优化法提出了一个企业专利组合质量评价模型。从规模性、创新性、稳定性、经济性和战略性5个方面选取企业专利组合质量的评价指标，采用三角模糊数和多目标优化方法计算指标的主观权重，采用两阶段优化方法计算指标的客观权重，通过主客观赋权确定指标的综合权重。随后根据指标评价值和指标权重对专利组合质量进行排序，并将提出的模型应用于动力电池企业的专利组合评估。研究结果表明：该方法综合了专家决策信息和客观数据，可对企业专利组合进行有效评估。     

组合赋权聚类-双基点模型的井下人体热舒适评价

针对井下人体热舒适性评价不准确、评价指标少等问题,以蒋家河煤矿工作面为例,选取环境温度等13个评价指标,构建井下人体热舒适评价指标模型.采用主客观赋权的方法计算各指标权重,引入拉格朗日函数,优化决策模型,通过欧式距离建立两者联系,确定两种方法偏重系数,计算各指标的理想组合权重,构建组合赋权聚类-双基点综合评价模型,利用...     

基于专家可信度的熵权-AHP建筑施工企业信用评价

由于建筑施工企业信用评价的复杂性,采用定性与定量相结合的综合评价方法,提出了一种新的数学评价模型.首先,运用层次分析法(AHP)对指标体系进行系统划分.其次,针对专家主观偏好带来的影响,采用了专家评价法来计算专家可信度,针对主客观性指标评分标准的差异,对指标进行主客观的划分,进而根据企业信用主客观得分建立了评价指标矩阵.而指标权重的计算则采用主客观相结合的方法,将层次分析法与熵权法相结合.最后,通过对多个建筑施工企业信用评价,验证了模型的有效性、合理性.     

煤层冲击倾向性变权重可变集分类识别

针对煤层冲击倾向性评价的模糊不确定性问题,为准确合理地评判冲击倾向性强弱,提出变权重可变集分类识别模型。模型选取动态破坏时间、弹性能量指数、冲击能量指数和单轴抗压强度作为分类指标,采用CRITIC法计算指标客观常权,利用指标数据与指标分类标准值区间的关系求解指标客观变权,最后运用博弈论对主客观权重进行优化集成,得到评价对象的变权权向量。引入可变集理论合理确定评价指标对各类别指标标准值区间的相对差异度,建立冲击倾向性可变集评价模型,依据类别特征值判断评价对象的隶属类别。实例表明,该方法较好地考虑了模型参数与样本指标权重的可变性,能科学合理地评价煤层冲击倾向性,识别结果更为可信,为煤岩冲击倾向鉴定与冲击地压危险性预测提供了新的方法和思路。     

基于投影寻踪的组合评价方法研究

以理想解法和灰色关联度分析法为基础进行组合,得到的组合评价方法能够提高评价结果的有效性。在该组合评价方法的研究中,常规的作法是对指标组合权重的运用主观赋值法,组合的偏好系数、灰色关联度的分辨系数采取人为赋值法,没能充分挖掘组合评价方法的优势。针对此问题,提出用投影寻踪法构建处理组合评价法的优化模型,运用实码加速遗传算法处理该非线性优化问题,所得的指标权重为客观权重,同时得到确定组合评价法组合偏好系数和灰色关联度分辨系数的新方法。实例表明,基于投影寻踪的组合评价方法具有科学性和客观性。     

既有公路服务区设施配置适宜性评价模型

随着社会的进步和发展,既有公路服务区设施配置逐渐难以满足司乘人员多元化的功能需求,为实现提高既有公路服务区设施配置适宜性的目的,本文围绕适用于既有公路服务区设施配置适宜性评价指标体系与评价模型展开研究。首先,从设施状况、服务水平、用户体验三方面,构建了涵盖设施完备率、平均拥堵程度、价格满意度等11项的评价指标体系;其次,在采用AHP法、序关系分析法、熵权法、DEMATEL法等单一赋权法获取了各指标主客观权重的基础上,引入最小二乘法最小化组合权重与主客观权重偏差的平方和,确定了各指标的最优组合权重,由此建立了改进云模型;最后,将研究模型应用于四川省某服务区R中,结合正向与逆向云发生器,计算出该服务区的综合评估云,进而确定评价等级为“良”。结果表明,运用改进云模型对既有公路服务区设施配置适宜性进行评价的方法是可行的。     

装备研制方案的技术风险评价

针对装备方案论证阶段技术风险发生概率、后果影响程度与技术风险大小间的关系,基于相对熵原理计算技术风险各评价指标的主观权重与客观权重的组合权重,采用投影法构建技术风险评价模型.实例计算结果表明:技术风险评价模型初步解决了模糊综合评价或灰评价模型所存在的区分性不强、评价结论有片面性、依赖较多的历史经验数据等问题,得到了评价方案集中各方案的技术风险发生概率、后果影响程度及技术风险的排序,计算过程与符合技术风险的内涵要求一致,为装备研制方案的科学决策提供理论依据.     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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