基于聚类蚁群算法的物流最优路径

在物流网络系统中,物品的配送是重要的一环,一个科学的物流配送路径,不仅能在一定程度上降低物品的配送时间,而且能有效的降低运输资源的占用,这极大的降低了物流企业的运营成本。针对物流配送路径的最优解问题,有大量的学者进行了相关研究,主要有遗传算法、蚁群算法、生物地理学算法等,其中以蚁群算法应用最为广泛;但这些算法都只是在物流运输的路径上进行优化,并没有考虑空载率以及客户对送货时间的要求。为了克服此缺点,本文在蚁群算法的基础上加入空载率和时间窗的要素,对传统的蚁群算法进行优化。实验结果表明,与传统的蚁群算法相比,该算法可以有效的节约物流运输资源。     

运用蚁群算法解决物流中心拣货路径问题

研究了运用蚁群优化算法解决物流中心拣货路径问题,并与传统的基于穿越策略的拣货路径策略做比较.执行结果显示以蚁群优化算法解决物流中心仓储拣货作业,可明显减少拣货路径的距离及拣货时间,提高物流中心的作业效率与服务水平.     

带目标权重的物流路径优化研究—基于模拟退火蚁群算法

物流路径优化问题是物流研究领域十分重要的研究课题。针对物流企业对物流配送时间、距离以及运输成本的要求不同,建立带目标权重的物流路径数学模型,物流企业可对目标权重进行赋值进而满足自身的需求。针对基本蚁群算法易陷入局部最优以及收敛速度慢的缺陷,对基本蚁群算法的转移规则和信息素进行改进,然后在改进的基本蚁群算法中融入模拟退火算法思想,建立模拟退火蚁群算法。实验结果表明:模拟退火蚁群算法能搜寻到比基本蚁群算法更优的综合成本,且收敛速度更快,同时也表明模拟退火蚁群算法的可行性及数学模型的合理性。     

蚁群算法在物流路径优化中的应用及仿真

蚁群算法是一种模拟进化算法,适合于求解复杂的组合优化问题,传统蚁群算法收敛速度慢,有时可能出现停滞现象.该文以蚁群算法为核心,采用最短路径法和自定义代价获取最优物流路径,通过优选参数改进蚁群算法,从而有效避免局部解的出现.实验结果表明,改进后的算法效率具有较大改进,算法在实验环境下收敛性较好.     

基于仿生算法的灾后救援路径选择

为解决应急物流管理中的路径选择问题,综合考虑了运输时间、运输距离和路径复杂性等因素,建立了灾后救援的路径选择模型.在灾难发生后,路径中的运输速度将被灾难扩展深深影响,特别是在洪水、飓风等灾难中,将在时间和空间上逐渐扩展,因此将运输速度设定为随着时间而连续递减的函数.针对问题性质,提出了多头绒泡菌算法来解决这个问题.多头绒泡菌算法不同于其他的仿生算法,可以100%找到最优路径.案例研究表明:利用该方法进行灾后救援路径选择,能够有效获得最优路径.     

基于改进蚁群算法的物流车辆调度问题研究

传统蚁群算法在求解中容易出现搜索时间长、收敛过早或停滞现象,为克服这些缺点,通过对蚁群算法进行选择策略、信息素更新等方面的改进,以加快算法的收敛速度,提高算法的搜索能力。再将改进后的蚁群算法引入物流运输车辆调度、综合车辆调度理论,对物流运输车辆的优化调度进行了探讨,对有时间窗车辆调度问题(VSPTW)探求新的求解方法,运用Matlab语言进行编程实现,应用实例对算法进行验证。实践证明,改进后的蚁群算法基本上克服了一般蚁群算法自身的不足,提高了算法的性能。     

蚁群聚类算法在物流网络优化中的应用

为了解决物流配送中的路径优化问题,运用改进的蚁群算法来建立配送车辆路径的数学模型,通过减少蚁群的选路次数、更新信息素等策略,提高了算法的收敛速度和全局搜索能力。经过实验分析和计算,证明了应用蚁群算法可以优化物流配送线路,可以有效地解决多回路运输问题。该成果对物流企业控制成本、增强市场竞争力有一定参考价值。     

蚁群算法及其在物流系统中的应用研究

分析了蚁群算法在物流系统车辆路径管理中的应用,展望了蚁群算法在其他物流系统优化中的应用,指出通过应用蚁群算法可降低物流成本、提高经济效益。     

改进蚁群算法在多目标下路径长度的研究

为解决蚁群算法规划时易陷入局部最优问题,提出一种适合多目标下全局路径规划的改进蚁群算法。将粒子群算法所得到的最优结果路径作为蚁群算法的初始信息素增强值,利用平均距离与当前距离比值和最优与最差路径正负反馈相结合来调节信息素更新策略,根据不同阶段中信息素挥发系数的影响将其动态划分来求解最优遍历顺序,得到最短路径长度。att48实例结果显示,相较于传统算法,改进算法在路径长度上缩短了6.76%,鲁棒性能提高了4.87%,证明了改进蚁群算法的有效性。     

基于改进蚁群算法的双向物流路径优化

针对物流路径优化已有算法运算过程复杂、精度不高、过早收敛等问题,对蚁群算法进行了改进,以解决物流路径优化问题.为了消除蚁群算法的易停滞、收敛慢等问题,从蚂蚁转移策略、信息素更新方式以及遗传算法的融合等方面对算法进行了改进.针对双向物流的路径优化问题,通过增加启发函数、设计转移策略等方面来改进蚁群算法,使得算法能更好地考虑综合因素来进行搜索,能够更全面、更准确地找到合适的下一节点,从而得到更优的路线.     

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     

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

正~~     

Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has