改进型人工鱼群算法及复杂函数全局优化方法

在分析人工鱼群算法存在不足的基础上,对人工鱼群算法加以改进,提出了一种改进型人工鱼群算法。该算法提高了全局搜索能力和收敛速度,并用于求解具有变量边界约束的非线性复杂函数最优化问题。仿真结果表明,改进后的人工鱼群算法具有精度高、搜索速度快等特点,是一种求解复杂函数全局最优化的智能算法。     

改进的人工鱼群算法

通过对人工鱼群算法的研究,给出了改进的人工鱼群算法。采用最优个体保留策略对觅食行为进行改进,防止群体中最优个体的退化;给出加速个体局部搜索方法,改进算法中的聚群行为和追尾行为,使全局最优值更快地突现出来;根据双射的定义和性质,在不影响最终寻优结果的情况下对问题的搜索域进行"缩小",从而加速了全局搜索。仿真结果表明改进的人工鱼群算法具有求解精度高、寻优成功率高、收敛速度快、算法稳定等优点。     

改进人工鱼群算法及其在时滞系统辨识中的应用

针对人工鱼群算法(AFSA)存在收敛速度慢和寻优精度低等问题,本文提出了一种改进人工鱼群算法(IAFSA).该算法中的人工鱼能够根据鱼群当前状态调整自身的视野和步长来平衡局部搜索和全局搜索.此外,算法中还加入了引导行为,即人工鱼在觅食行为未发现更优的位置时,当前人工鱼向最优人工鱼移动一步.仿真结果表明,改进人工鱼群算法在收敛速度、寻优精度和克服局部极值等方面有很大优势.本文将改进鱼群算法应用时滞系统的辨识中,辨识结果表明改进算法能获取被控对象的精准数学模型,并具有较强的抗干扰能力.     

基于模拟退火改进人工鱼群算法的交通信号配时优化

针对传统的信号配时算法无法适用于过饱和流量的交叉口的限制,结合模拟退火算法初值鲁棒性和局部收敛精度高的特点改进人工鱼群算法以提升其全局搜索能力,然后综合考虑周期时长、绿灯时间和饱和度等作为约束条件,以交叉口车均延误最小为目标函数构建信号配时优化模型,分别利用单一智能算法(模拟退火算法,人工鱼群算法)及其组合改进算法(模拟退火改进人工鱼群算法)对模型进行求解,并对现状方案和3种智能算法求解方案情况下的交叉口整体车均延误进行对比。结果表明,模拟退火改进人工鱼群算法的效果明显优于现状和单一算法,在迭代的初期便能非常接近最优解和稳定下降趋势,表现出快速寻优能力,验证了模拟退火改进人工鱼群算法的可行性与适用性。     

基于时变衰减函数的改进人工鱼群算法研究

在分析国内人工鱼群算法相关研究的基础上,针对其易陷入局部最优和发生振荡现象的缺点,在标准人工鱼群算法中增加时变衰减函数起到衰减因子的作用,优化其时间参数的取值,对人工鱼群智能算法求解过程中觅食行为的视野以及步长的取值进行优化完善;增加鱼群的跳跃过程及变异因子,避免求解过程中早熟现象的产生,保证其最优解为全局最优.研究了传统与改进算法的求解过程及步骤,最后,以常用的3个测试函数为算例对其进行测试,对比分析传统与改进算法之间的区别,对测试的结果进行分析,得到改进的人工鱼群算法具有求解精度高、收敛速度快、寻优能力强的特点.     

改进人工鱼群算法求解TSP问题

针对TSP问题的特点,在经典最近邻点法基础上对其运行方式加以改进,结合基本人工鱼群算法的优势,对基本人工鱼群算法加以改进。利用改进最近邻点法为基本人工鱼群算法构造多个较优初始解,进而改进基本人工鱼群法的觅食行为。改进后的人工鱼群算法能更有效地搜索全局最优解。选取典型的TSP问题实例进行实验仿真,验证该算法的有效性。实验表明,改进后的人工鱼群算法在求解旅行商问题时,比基本人工鱼群算法搜索效果更好,寻优性能更强。     

改进人工鱼群算法及其收敛性分析

为了克服人工鱼群算法容易收敛于局部最优和解精度不高的缺点,提出了一种新的小生境人工鱼群算法(NAFS)。在算法后期根据鱼群聚集程度引入小生境排挤机制,维持种群的多样性。为了说明该算法的有效性,利用压缩映射定理从理论上证明了该算法的全局收敛性。最后,通过在四个典型Benchmark函数上的实验,并与差异演化算法、粒子群算法、鱼群算法对比,证明该算法的解精度比原始人工鱼群算法有较大的提高。     

带外包的服饰运输调度问题的优化

由于服饰产品是一种时效性很强的商品,而且服饰产品在配送过程中可以外包给快递公司进行配送,对带外包和硬时间窗的服饰运输调度问题（Apparel products Vehicle Routing Problem with Hard Time Windows and Outsourcing,AVRPHTWO）进行分析,并构建了AVRPHTWO、一般性VRP（Vehicle Routing Problem）和VRPSTW（Vehicle Routing Problem with Soft Time Windows）的数学模型,通过对基本的人工鱼群算法（artificial fish swarm algorithm,AFSA）进行改进,混沌搜索被引入人工鱼群算法来提高算法的全局收敛性,反馈策略用来指导人工鱼的移动,以此来提高收敛精度。应用混沌人工鱼群算法（chaotic artificial fish swarm algorithm,CAFSA）及遗传算法（genetic algorithm,GA）对所建立的三种模型求解,通过对实验数据进行处理,证明了AVRPHTWO模型和混沌人工鱼群算法求解此类模型的有效性,进一步证明了问题模型的复杂程度影响算法寻优能力,问题模型简单时,遗传算法更优;问题模型复杂时,混沌人工鱼群算法更优。     

基于文化算法的改进遗传人工鱼群优化算法

针对人工鱼群算法精度不高,后期收敛速度慢等缺点,文章提出了一种基于文化算法框架的遗传人工鱼群优化算法。该算法利用文化算法框架,建立了遗传算法优化的信仰空间和人工鱼群算法优化的种群空间,两个空间并行演化,同时通过接受函数和影响函数相互促进,克服了人工鱼群算法易陷入局部极值导致后期收敛速度慢和精度不高的缺点。通过对4个基准测试函数进行求解,表明了该算法相比基本鱼群算法在求解过程中精度更高,鲁棒性更强,收敛速度更快。     

改进的人工鱼群算法在置换Flow Shop调度中的应用

分析了人工鱼算法(AFSA)存在的不足,在保持AFSA算法基本行为的基础上,提出了在觅食行为过程中采用基于交换列表的排序法,在随机移动行为中采用自适应的小范围移动行为的改进人工鱼群算法。根据置换Flow Shop调度问题的数学模型,给出了基于改进的人工鱼群算法的置换Flow Shop调度问题的求解策略,并详细讨论了求解步骤。仿真实验结果表明:该算法具有较强的全局搜索能力、更高的搜索效率,同时验证了该算法的可行性和有效性。     

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.     

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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