基于鲁棒优化的低碳再制造物流网络模型

为了解决不确定环境下低碳再制造物流网络设计的问题,在碳排放权可交易的情况下,考虑运输成本、需求和废旧产品质量的不确定性,对于回收中心的开或关及其是否扩建、其余设施选址和节点间运输路线等决策,采用鲁棒优化方法,以碳交易收支和物流成本之和最小化为目标,建立了再制造物流网络鲁棒混合线性规划模型。通过案例验证了鲁棒模型的可行性,就碳交易和不确定参数的变化进行分析,表明鲁棒模型的决策平衡了最优性与鲁棒性。     

需求及建设成本不确定下考虑失效的内陆港选址研究

针对需求和建设成本不确定及节点失效下的内陆港选址问题,应用随机规划理论解决需求不确定性问题,应用最小最大后悔值理论解决建设成本不确定性问题,构建该问题的鲁棒—随机选址模型。设计粒子群—模拟退火算法求解,通过算例分析验证模型的有效性。结果表明:鲁棒—随机选址模型可得到鲁棒性较强的解,能很好地解决内陆港选址中需求和建设成本不确定问题,降低各情景发生时的最大后悔值;考虑内陆港失效对提高内陆港系统的可靠性及减小失效风险具有显著作用。     

装备维修器材仓库选址鲁棒优化模型

为避免参数扰动导致决策失效,提出了一种维修器材仓库选址模型的鲁棒优化方法.首先采用情景分析法对维修器材需求量的不确定性进行描述,确定情景集合;其次引入可调节风险系数,建立维修器材效益最大化与费用最小化的双目标鲁棒优化模型,并采用NSGA-Ⅱ算法对所建的多目标模型进行求解;最后将所得鲁棒解代入各情景,求得目标值以供决策....     

不确定需求下应急物流系统多目标鲁棒优化模型

针对在突发事件发生的紧急救援期,应急物流系统的运载能力有限性及多种应急物资的需求不确定性,采用相对鲁棒优化方法建立了基于总时间和总成本最优的多目标数学模型.结果表明:模型合理地解决了应急物资在需求不确定条件下选址-路径的安排问题,通过算例将绝对鲁棒优化与相对鲁棒优化的对应问题以及单目标与多目标模型的最优解进行对比,验证了多目标鲁棒优化模型能够体现应急物资在需求不确定条件下选址-路径方案的最优性与鲁棒性的均衡,从而在突发事件发生时能有效保证应急物流决策的鲁棒性.     

基于鲁棒优化的逆向物流网络设计研究

逆向物流的流量预测困难,加上各种成本的不确定,其稳定性难以保证。为研究其选址问题,建立了一个以总成本最小为目标的标准模型,并在标准模型基础上加入因无法满足的处理量而产生的惩罚成本。分析出其中可能的不确定参数,进行规范式处理,引用p-robust建立鲁棒优化模型。随机构建一个案例,考虑外界参数不确定,将标准模型和鲁棒优化后的模型分别使用粒子群算法进行求解,得出不同的选址结果,对比表明高度不确定下的鲁棒优化模型的选址决策具有较低的风险。分析各不确定参数对总成本波动的影响程度,得出逆向物流量对总成本波动影响最大,应加以重视。最后考虑网络结构不确定,给出一种在不同不确定等级下的选址方法。     

不确定条件下多产品第四方物流闭环网络鲁棒优化研究

在不确定条件下,构建了一个包括生产商、集中退货中心、消费区/初始退货点、维修处理中心、分销中心和废弃处置中心的单周期多产品第四方物流闭环网络选址模型。在销售量和退货率均不确定的情况下,用鲁棒优化的方法进行优化,目标是使总成本最小。通过lingo 10对具体算例进行求解。结果验证了该模型的鲁棒性。     

基于遗传算法的电梯群控鲁棒优化模型

针对电梯群控调度过程中交通流不确定的问题,建立了鲁棒优化模型,利用遗传算法对所建模型进行求解.对于不确定线性优化问题,研究了不确定集的选择以及模型鲁棒对等式转化方法.仿真实验中,利用电梯群控虚拟仿真环境对鲁棒优化调度算法在不同交通流下进行了验证.以300人/15 min的混合交通流模式为例,鲁棒优化算法的平均候梯时间比静态分区算法降低12.77 s;平均乘梯时间比最小等待时间算法降低9.7 s;电梯启停次数比静态分区算法少8次.实验结果表明,鲁棒优化调度算法对不同交通模式具有更好的适应性,可以减小交通流不确定性的影响,提高电梯群控调度性能.     

客流需求不确定下城市轨道交通线路协同限流鲁棒优化研究

研究了客流需求不确定下城市轨道交通线路协同限流问题。构建了城市轨道交通线路协同限流确定性模型，在此基础上，基于情景分析的鲁棒优化方法，采用具有已知概率的情景集描述客流需求的不确定性，将此模型扩展为含不确定因素的鲁棒优化模型，对每个时段每个车站的最佳进站量进行了求解，达到在保障运营安全的同时使站外的滞留人数最少的目的，并以北京地铁八通线为例对模型进行了验证。通过将确定性模型与鲁棒模型进行对比发现，鲁棒模型能降低限流策略对不确定客流需求的敏感程度，使不同需求情景下的滞留人数保持在可接受的范围内。     

不确定条件下协同设计参数鲁棒优化方法

提出了不确定条件下基于广义动态约束网络(GDCN)的协同设计参数鲁棒优化方法.分析了协同设计中的参数不确定性,基于GDCN建立协同参数鲁棒设计方法框架;在同时考虑目标属性鲁棒和约束可行域鲁棒的前提下,建立了一种带偏好信息的协同设计参数多目标鲁棒优化(MORO)模型;并给出了MORO模型的优化求解流程.通过发动机设计实例,验证了该方法的有效性和可行性.     

呼叫中心人力资源配置鲁棒规划模型

针对现实呼叫中心中顾客到达不确定的问题,建立了基于排队论的离散流体模型,解决了考虑鲁棒性呼叫中心的人力资源配置问题.通过区间数据来表示顾客到达的不确定集,利用可调整鲁棒优化方法的思想,分析了鲁棒优化模型与确定性优化模型的关系.数值试验表明,使用可调整鲁棒参数的鲁棒优化方法减小了呼叫中心到达率不确定性给呼叫中心系统带来的影响;到达率越大,对应的最优的鲁棒参数越大,模型越保守.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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