求解离散网络平衡设计问题的遗传算法

针对离散网络平衡设计二层规划模型,提出了一种新的求解算法,对上层问题采用遗传算法,而对下层问题采用平衡交通分配的Frank-Wolf算法.数值试验结果表明:该算法是有效的.能够较快地求解这类网络平衡设计二层规划模型.     

一个求解离散网络平衡设计问题的新算法

针对离散网络平衡设计二层规划模型,提出了一种新的求解算法。在模型求解中,上层问题采用遗传算法,而下层采用仿射尺度内点算法求解平衡交通分配问题。数值试验结果表明,本文提出的算法是有效的,能够较快地求解这类网络平衡设计二层规划模型。     

非平衡交通分配的离散网络平衡设计的遗传算法

针对离散网络平衡设计二层规划模型,提出了一种新的求解算法.二层规划模型中上层问题对它采用遗传算法,下层问题是平衡交通分配模型,对它采用非平衡交通分配方法的拟FrankWolfe算法,并给出了算例,数值试验结果表明本文提出的算法是有效的且计算量小、收敛较快.     

基于Logit分配的交通网络设计模型的改进粒子群算法

基于随机平衡分配模型与由效用理论推导的Logit交通分配模型的等价性,提出了基于Logit分配的交通网络设计模型。模型求解中,上层模型采用改进的自适应变异粒子群算法,而下层问题直接利用Logit模型求解。仿真结果表明该模型与算法是有效的。     

考虑汽车排放需求变化的多目标连续型交通网络设计

文章研究需求变化的多目标连续型交通网络设计问题的优化模型和算法,利用双层规划模型求解问题;上层以路网系统阻抗、路段总投资、汽车不同尾气排放量最小化作为优化目标,并受到原路段的通行能力约束,下层是基于需求变化下的用户平衡配流模型;使用非对称Nguyen-Dupuis网络,利用精英保留和随机遍历的选择遗传算法求解上层模型,采用基于路径的双梯度投影算法求解下层模型。设计相应算法程序对模型进行验证,通过算例测算综合需求排放分析和综合需求下多目标参数分析,结果表明模型有效、求解算法可行。     

用户平衡分配条件下交通控制优化研究

基于信号配时和路径选择之间的相互作用机制,提出了一种区域协调多相位定时控制优化的双层规划模型.模型下层用具有路段容量约束的用户平衡描述拥挤网络条件下的路径选择,并引入了节点流向阻抗,上层为区域协调多相位定时控制优化模型,以总行驶时间和停车次数构成的网络性能指标作为信号优化的目标.采用乘子法求解带有路段容量约束的用户平衡问题,用灵敏度分析算法求解该双层规划问题.     

基于蚁群全局优化的二层规划模型与仿真

二层规划问题通常是一个非凸问题,因此在实际工程领域对其进行求解具有极大的困难.研究了问题的本质特征,提出了一种组合设计算法模型——基于蚁群算法求解二层规划问题的全局优化策略.组合算法采用蚁群算法求解上层问题,下层的线性规划问题则采用单纯型算法完成求解.设计的组合算法思路清晰,仿真计算结果表明,该算法有着良好的全局收敛可靠性和较高的收敛速度,是目前求解此类两层线性规划问题的一种有效算法.     

弹性需求下拥挤道路收费优化模型与算法

研究了弹性需求下道路收费的优化问题。建立了双层规划模型。其中上层模型以最小化网络总的出行费用为目标。下层模型满足弹性需求下的平衡分配模型。提出了满足Wordrop平衡原则的模型以及求解算法,最后给出了算例。     

容量限制非对称网络设计模型及算法

为了缓解交通压力，通常会对已有的路网进行改造以提高其通行能力， 针对这类带容量限制的非对称弹 性需求网络设计问题，提出了它的模型及算法．模型中上层同时考虑了增加新路段和对已有的路段进行扩容， 下层 是非对称网络的用户平衡问题，提出的算法克服了求解这类问题时计算量大及路径枚举等困难， 计算实例表明算 法是有效的．     

综合客运通道设计的双层规划模型及算法

描述了综合客运通道的网络结构,分析了通道内旅客出行的广义费用函数,将运输成本、安全性、舒适性等服务属性作为出行阻抗的度量因素,以添加新的旅客运输方式为手段来优化旅客运输网络,设计了综合客运通道离散型网络优化设计问题的双层规划模型,上层模型以网络容纳的OD需求量最大为目标,下层模型为用户平衡问题.采用分支定界法对模型进行求解,并通过算例证明了模型的有效性.根据结果比较各方案的单位投资额所引起的网络容纳OD需求增加量,进一步从投资效率角度解释了方案的优劣,分析表明,该模型和算法能够得到综合客运通道网络优化设计的最优投资方案,为建设决策部门提供定量的决策支持.     

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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