一种求解车辆路径问题的双目标遗传算法

车辆路径问题是一个NP-难问题,将该问题描述成为一个多目标最优化问题,并为之提出了一种双目标遗传算法来解决该问题.在算法中设计了一种新的构造非支配集的方法,改进了杂交算子,混合了局部爬山法.实验结果表明该算法是求解车辆路径问题的一种高效的算法.     

改进的粒子群优化算法在可靠性问题中的应用

提出了一种改进的粒子群优化(IPSO)算法以解决可靠性问题.IPSO算法使用3种策略来改进粒子群优化算法(PSO)的速度更新步骤,这有利于提高算法对解空间的开发能力.另外,一种动态调整的惯性权重被引入到速度更新中以平衡IPSO算法的全局搜索和局部搜索.实验结果表明,在解决可靠性问题上,IPSO算法比其他两种粒子群优化算法具有更强的收敛性和稳定性.IPSO算法是解决可靠性问题的一个有效的选择.     

一种LP问题的几何算法——点线面循环算法

提出了LP问题的一种新算法--点线面循环算法,它克服了单纯形法及其一些现有改进算法普遍存在的问题--即变量爆炸性问题,为LP问题求解在计算机上实现提供了一种更经济的途径与方法.参8.     

一种基于Minmax算法的混合MIMIC算法

将Minmax算法与MIMIC算法相结合,提出一种基于Minmax算法的混合MIMIC算法.该算法不再利用传统的约束保持法和可行规则法处理约束条件,而是结合Minmax算法的思想将约束问题转化为无约束问题,并利用MIMIC算法对无约束问题求解.数值试验结果表明:该算法能收敛到满足约束条件的全局最优解,并且具有很强的全局搜索能力,为解决非线性约束优化问题提供了一种新的有效途径.     

基于神经网络的函数逼近问题

给出了函数逼近问题,提出了一种新的神经网络模型,结合函数逼近问题及该神经网络模型给出了一种学习算法,并利用该算法对函数逼近进行了仿真.说明了该算法的实用性.     

带时间窗车辆路径问题的混合粒子群算法

将粒子群优化算法与模拟退火算法结合,提出了一种求解车辆路径问题的混合粒子群算法.实例计算及与遗传算法比较的结果表明:应用混合粒子群算法可以快速地求得带时间窗车辆路径问题的优化解;该算法是一种求解离散组合优化问题的有效方法.     

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.     

基于人工鱼群算法的多元线性回归分析问题处理

人工鱼群算法(AFsA)是一种基于动物行为的自治体寻优模式,依据鱼类活动特点构建的新型智能仿生算法.简要介绍了AFSA算法的基本原理,描述了使用AFSA算法解决多元线性回归分析问题的步骤和结果.仿真实验结果表明,AFSA算法在处理多元线性回归分析问题上是一种简单、高效的算法.     

文化算法及应用研究

文化算法是一种新型智能优化算法,与传统智能优化算法而言,文化算法提出了一种进化框架,任何一种智能优化算法都可以嵌入其中.但是由于文化算法出现时间短,理论基础薄弱,研究刚刚开始,远没有像遗传算法和粒子群算法那样形成系统的分析方法和一定的数学基础,有许多问题还需要进一步研究.介绍了文化算法的基本原理、应用前景和国内外的研究现状,针对该算法在研究过程中存在的问题,提出了若干研究方向.     

基于Prim算法的度约束最小生成树问题研究

针对一类度约束最小生成树问题,基于传统最小生成树问题的Prim算法,设计了一种求解算法.该算法在保证网络中指定节点的度不变的前提下,构造了网络关于指定节点的最大度最小生成树.与经典的Gloveklingman算法进行了仿真比较,结果表明,该算法是求解度约束最小生成树问题的一种有效算法.     

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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