基于混合粒子群算法的货位优化分配问题

基于COI分类存放的思想,同时考虑到货位分配问题中存取开销和占地花费的平衡,提出了一种混合粒子群算法以解决仓库货位优化分配问题．建立货位分配模型,并引入了货物的COI值对货物进行重新分类．将粒子群算法同人工蜂群算法相结合,通过优化COI值从而对货位进行优化分配．最后,进行实验分析并证明了混合粒子群算法的正确性,可有效地应用分类存放策对货位进行优化分配,减少货位数和存货代价．     

新型棋盘格密集仓库的出入库货位分配优化

从提升有轨自动化小车(RGV)出入库作业效率的角度出发,在综合考虑RGV加减速和行走方向改变所带来的影响前提下,对新型棋盘格密集仓库出入库复合作业模式下的货位分配问题进行研究,设计了基于混合遗传算法的出入库货位分配算法,以对货位分配问题进行求解.仿真试验结果证明,该算法能有效解决不同规模下新型棋盘格密集仓库的货位分配问题,使RGV的整体作业效率提升40%左右,并且具有货架规模越大则效率提升越明显的优势.     

基于离散粒子群算法的AVS／RS货位优化

为了提高自动小车存取系统的存取效率和方便货位管理,提出了基于离散粒子群算法的货位优化方法.该方法首先建立了系统货位优化的数学模型,在此基础上,结合货位优化的原则提出了货位分区的策略,并基于离散粒子群算法实现了货位分配的优化,从而保证自动小车在不发生死锁的前提下调度货物时,能较好地缩短小车行走时间.最后,通过仿真实例验证了算法的有效性.     

多出/入口仓库的货位优化研究

在“人到货”多出/入口仓库货位优化问题中,为了减少库内整体作业时间,提高拣选效率,基于多维标度分析算法（Dimensional Scaling Analysis algorithm,MDS）与峰值聚类算法（Peak Clustering algorithm,DPC）,提出以货品相关性为基础的货位优化方法。首先通过历史订单数据进行分析获得货品相关度矩阵,并利用多维标度分析算法对相关度矩阵进行数据处理,在仓库实际情况下确定合适数量聚类簇后,采用峰值聚类算法将相关性高的货品聚类形成一个具有高相关性货品集合,再据货品集合优化存储区域。最后,本文通过实际案例进行分析,比较本文存储策略与原始存储策略在跨区域拣选条件下订单平均拣选距离,并通过本文优化策略与随机策略在相同规模订单情况下比较验证,结果显示,本文策略比随机策略优化平均优化24.56%,有效地提高了订单拣选效率。     

基于遗传算法的立体仓库货位动态分配优化

针对企业仓储管理中货位分配效率低的现状,提出立体仓库货位动态分配优化问题的数学模型和约束条件并对货位分配策略进行了讨论.采用基于遗传算法的权重系数变换法对优化模型进行求解.通过仿真验证了算法的有效性.     

面向低能耗的密集仓储货位分配优化

针对四向车式密集仓储系统的货位分配问题，提出一种四向车及提升机的能耗计算模型，并考虑动态货位可行域约束等因素，建立了以减少能耗为主要目标且兼顾降低货架重心与作业分布均衡的货位分配优化模型。设计自适应变异的差分进化算法对模型进行求解，向量个体表示单批作业的目标货位集合，将个体基因位的值域映射为相应出入库作业的货位可行域，根据此动态货位可行域进行个体解码后得出可行货位解，通过综合评价个体的优劣及种群迭代进化获得作业的最优货位解。在3种预设库存和3种载荷类型的情况下分别进行试验，结果表明，与考虑最短距离的货位分配优化模型相比，所提出的模型及算法可有效降低仓储能耗且其性能优势明显。     

检修备品库的货位优化模型

为了对货位进行合理分配,以提高检修备品库的领料效率,分析了检修用料的特点,并综合生产环境和分销环境下仓库货位优化的思想,提出检修物料的确定相关性和统计相关性这两个概念.根据物料相关性及用料频率,建立了检修备品库货位分配的多目标优化数学模型.模型的优化目标是,既要尽量将关系密切的物料聚集摆放,又要尽量将使用频率高的物料靠近出入库口存储.最后采用蚁群算法求解了该NPC(non-deterministic polynomial complete)问题,与采用随机分配策略的仿真结果相比,领料效率提高了23%～28%.     

模拟退火算法在粮虫图像分割中的应用

将基于模拟退火算法的改进模糊C均值聚类应用到储粮害虫图像分割中.针对模糊C均值聚类算法中计算量大和易陷入局部最优的问题,引入模拟退火算法,开始时以较快的速度找到最优区域,最终找到全局最优解,可以提高收敛速度和计算的精度.Matlab仿真实验表明该算法在储粮害虫图像分割中比模糊C均值聚类更有效.     

利用拉格朗日松弛算法求解三维分配问题

将拉格朗日松弛算法与最优求解算法的复杂性进行了分析比较，并将该算法应用于求解3-D分配问题,分析与算例结果表明，该算法可大幅度降低3-D分配问题的求解计算量，是求解3-D分配问题的一种有效算法．     

基于粗糙集理论的模糊C-means高维数据聚类算法

模糊C-means算法是一种重要的聚类分析算法,但是在数据维数较高的情况下,该算法计算量急剧上升从而导致其效率较低.针对这一问题,提出了一种基于粗糙集理论的模糊C-means高维数据聚类算法,该算法在传统模糊C-means算法的基础上引入了粗糙集属性约简的理念,通过对数据集属性的约简,提取出对分类影响较大的属性集而摒弃与分类无关的属性,进而在聚类过程中只计算属性约简结果集中的属性,从而减少聚类过程的工作量、提高聚类效率.理论分析和实验结果表明,该算法在处理高维数据时较高效.     

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