基于随机需求和顾客满意度的多期闭环供应链网络均衡

研究了随机需求下由多个制造商、零售商、需求市场和回收中心组成的多期闭环供应链网络,其中网络各成员的产量、交易量、需求量和需求市场的价格随着时间周期动态地变化,由库存量的调整来延续网络各成员决策的发展。在考虑随机需求和顾客满意度的基础上,分别构建了多期闭环供应链网络中各成员利润最大化的模型,利用均衡理论和变分不等式理论得到其均衡条件,最终得到整个多期闭环供应链网络均衡。通过求解满足等式、不等式约束变分不等式的对数二次逼近预测校正法得到在一定顾客满意度基础上的网络中,各成员每个生产周期的均衡产量、交易量、库存量和需求市场的价格。通过算例验证了模型及算法的有效性,并对顾客满意度灵敏度分析,得到其对网络各成员决策和利润的影响。     

闭环供应链的网络设计问题研究

在供应链管理环境下，实施逆向物流是现代企业增强竞争优势的手段之一．当前的研究主要集中在供应链及逆向物流的网络设计问题．计算机与网络技术的迅速发展以及激烈的市场竞争已经迫使企业关注两种网络的整合问题，以期能通过供应链做出更有效的决策．本文对处于保修期内的返回商品的闭环供应链的网络设计进行了研究，基于企业成本最小原则，建立了关于加工工厂，分拆检测中心以及货物流分配的混合整数规划数学模型，并运用了Bender方法对模型进行了求解.     

两条单生产商单零售商供应链的选址与定价竞争研究

基于"线性市场"与线性运输成本的Hotelling模型,研究两条由单生产商单零售商组成的供应链的选址与定价竞争,建立了两条供应链均为集中式供应链(II模式)、均为分散式供应链(DD模式)、一条为分散式供应链一条为集中式供应链(DI模式)的竞争均衡模型,给出了均衡解的存在条件和均衡解.研究表明:DD模式下两条供应链的定价与利润比DI模式高,而DI模式又比II模式高,所以供应链集中式决策不是利润最大化目标下的占优策略;两条供应链的成本之差影响到双方利润,低成本供应链具有竞争优势.最后,对3种模式进行了数值仿真,参照结果提出了管理建议.     

供应链控制模型优化的贝叶斯博弈方法探究

供应链管理是对供应链上各企业间活动的整体集成,协调供应链上各企业之间的关系,供应链系统中的供应、生产、销售基本环节存在委托代理关系。基于贝叶嘶博弈分析了企业间的关系,设计了生产商、销售商委托代理模型的分析机制,其中生产商即委托人的目标函数是利润最大化,销售商即代理人的激励条件是不低于最低销售利润,有效地协调和控制供应链上物流、信息流、资金流,使整个供应链效率最优,实现企业效益最大化。需建立相应的供应链优化机制的运作模型,以实现供应链的优化。     

考虑回收竞争和销售竞争的最优回收渠道设计

为了设计回收竞争和销售竞争交互作用下闭环供应链的最优回收渠道,基于1个制造商和2个零售商组成的闭环供应链,通过考虑不同的回收模式,建立了4个决策模型;运用最优化理论法求解模型的最优解,并给出数值例子对模型的最优解比较分析,研究了销售竞争和回收竞争的交互作用对闭环供应链整体的回收绩效、闭环供应链成员的最优决策和最大利润的影响.研究表明在回收竞争和销售竞争的交互作用下,制造商参与回收的模式会使闭环供应链整体获得更高的回收绩效和利润.     

考虑不同数量折扣的物流服务供应链回购契约协调研究

文章以单个物流分包商和单个物流集成商组成的两级物流服务供应链为研究对象,在单周期单一能力下,建立物流分包商主导的基于回购的物流服务供应链数量折扣模型,并分析该模型下物流集成商和物流分包商各自的最优决策.最后,通过数值实验可以得出,随着折扣的增加,物流集成商的物流能力采购量和物流分包商的单位回购价格下降,物流集成商期望利润增加,物流分包商期望利润减少,供应链系统期望利润增加、系统绩效提高.     

电子商务环境下具有随机需求的闭环供应链网络的设计与优化

研究电子商务环境下具有随机需求的闭环供应链的设计与优化问题.首先,考虑顾客需求的随机性和物流过程的模糊性,以供应链系统的总费用最小为目标建立了问题的数学模型;其次,运用模糊数学理论将模型中的模糊参数转变为确定性参数,并引入产品缺货成本和积压成本调节供需失衡时物流系统的总费用;最后,通过设计遗传算法确定了网络中生产中心和分销中心的优化选址以及各个物流环节的优化运输方案.数值仿真结果表明本文设计的算法能够有效地解决闭环供应链系统的设计与优化问题.     

信息共享模式对M-R二级闭环供应链绩效的影响

分析了信息共享的存在与否对M-R闭环供应链绩效的影响.通过博弈论分别建立了无信息共享和存在信息共享时制造商和零售商的定价和利润模型;论证了在两种情况下产品回收率与产品定价、产品需求量、供应链成员利润和系统总利润之间的关系;对二种信息共享模型下的M-R闭环供应链绩效进行分析.研究表明制造商在存在信息共享时获得的利润要高于无信息共享时的利润,并且在信息共享时制造商除了获得供应链本身增加的利润外还会掠夺零售商一部分的利润.     

模糊需求下三级供应链利润共享契约模型

基于可信性理论和博弈理论,研究了模糊需求环境下由制造商、分销商和零售商组成的三级供应链的协调问题.通过对分散决策模型和集中决策下最大利润理想模型的分析,设计了供应链利润共享契约协调模型.在合理调整和计算利润分配参数下,使供应链节点企业实现利润共享.并用算例验证了该模型能够使得供应链各企业在市场模糊需求环境下达到有效协调并使之利润最大化.     

需求依赖库存量的n-2型供应链网络决策模型研究

针对n个制造商和2个零售商组成的供应链网络,假定不同制造商生产的品牌产品无差异、产品需求依赖于产品初始库存水平,并受到竞争产品库存和竞争零售商产品库存的影响,分别研究了各成员以自身利润最大化为目标进行分散式决策的带均衡约束的均衡模型、制造商主导的以品牌利润最大化为目标进行集中式决策的纳什均衡模型、以及零售商主导的以渠道利润最大化为目标进行集中式决策的纳什均衡模型,并给出了三种模式下的竞争均衡状态。结果表明,三种模式中分散式决策模式下的订购量最低,导致相应的品牌利润低于品牌利润最大化决策模式、相应的渠道利润低于渠道利润最大化模式。提出了可协调分散式供应链中零售商分别选择品牌利润最大化模式下的订购量和渠道利润最大化模式下的订购量的两种回购合同形式。数值算例表明了模型的合理性和协调合同的有效性。     

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.     

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     

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

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