基于划分和重分布的粒子群算法及优化策略

提出了一种新的基于划分和重分布的粒子群优化算法.新算法将粒子划分为普通和优化两类.普通粒子随机产生,速度快,侧重全局搜索;优化粒子紧随群体最优并且速度较慢,侧重局部收敛,以提高收敛精度.当群体最优未发生变更的时间过长时,在保持群体最优的同时将粒子重新分布,以摆脱过早的局部收敛.对典型函数的测试结果表明,新算法没有增加复杂度,在摆脱解的早熟和提高解的收敛精度等方面优于基本粒子群算法.     

基于搜索空间自适应分割的多目标粒子群优化算法

提出一种基于搜索空间自适应分割的多目标粒子群优化算法, 根据粒子的搜索能力和规模与子搜索空间的体积呈多维标准正态分布变换, 精细分割搜索空间, 向划分出的子搜索空间分布粒子实现优化, 分割在迭代时持续进行, 直至获得最优解集. 实验结果表明: 该方法解决了多目标粒子群优化算法易陷入局部极值的问题; 在反向世代距离性能指标上, 该算法与一些典型的多目标粒子群优化算法相比, 其种群多样性和解的收敛性优势显著.     

基于解空间划分的PSO改进算法

 提出一种基于解空间划分的粒子群优化算法, 该算法在保持粒子群搜索能力的前提下对解空间进行预处理, 寻找最佳搜索区间, 提高了粒子群搜索效率; 在粒子群搜索过程中设置检查点, 动态更新解空间区间划分. 实验结果表明, 该算法有效提高了粒子群的搜索效率, 并使粒子群算法不易陷入局部极值. 同时, 在自适应状态下, 该算法能搜寻到指定精度下粒子群所需的最小迭代次数, 并得到较满意的最优值.     

基于最佳粒子共享和分层搜索的并行粒子群优化算法

为提高粒子群优化算法在优化问题中的效率,本文提出了并行粒子群优化算法(BLP-SO).基本思想是并行机制 最佳粒子共享 分层搜索.主要工作包括(1)信息共享机制中引入了区域学习,使粒子更新能参考其他粒子的信息;(2)提出了粒子群两层划分模型,底层利于扩大搜索范围,上层利于全局精细搜索;(3)证明了关于粒子群和并行粒子群收敛性定理;(4)在4个基准函数上的优化实验表明,新方法比经典的IPPSO并行粒子群算法在解的精度上提高了51.93%到96.10%.     

基于正交试验设计的粒子群优化算法

针对粒子群优化(particle swarmopti mization,PSO)算法在进化初期收敛速度快但容易陷入局部最优、在进化后期收敛速度变慢且精度低的缺陷,为了提高粒子群算法的收敛速度和全局寻优能力,提出了基于正交试验设计的粒子群优化(orthogonal-experi mental-design-based PSO)算法.在基本粒子群算法的基础上,算法OE-PSO对当前搜索到的解进行局部寻优,利用正交试验设计对搜索空间的分布均匀性在可行解的领域选择有代表性的解进行测试.算法OE-PSO用搜索到的更好的解在下一次迭代中引导粒子进行搜索,从而获得更快的收敛速度和更精确的解,同时避免局部最优.实验结果表明,算法OE-PSO不但具有较快的收敛速度,而且能够有效提高解的精确性,增强算法的鲁棒性.     

融合榜样学习和反向学习的粒子群优化算法

为了提高粒子群优化算法(Particle swarm optimization,PSO)的优化效率,降低其陷入局部最优的概率,提出了一种融合榜样学习和反向学习的PSO算法(PSO based on combing Example learning and Opposition learning,EOPSO).首先,对粒子群中的非最优粒子采用新颖的榜样学习机制更新,以便提高全局搜索能力,避免算法陷入局部最优;其次,对粒子群中最优粒子采用反向学习混合机制更新,提升该粒子的搜索能力,进一步避免算法陷入局部最优;最后,对粒子群中的最优粒子还采用了自身变异机制更新,有利于搜索前期的全局搜索和后期的快速收敛.在15个不同维度的基准函数上进行了仿真实验,实验结果表明,与最先进的PSO改进算法ELPSO、SRPSO、LFPSO、HCLPSO相比,EOPSO优化性能更好.     

共享历史最优信息搜索的粒子群算法

传统粒子群算法运行机理是通过粒子群全局最优和自身经验最优来搜索最优位置,不断迭代进化,以此趋近最优解,但该算法共享信息的局限性使其容易陷入局部最优.针对传统粒子群算法的不足,提出了共享历史最优搜索信息的粒子群算法.该粒子群体在搜索过程中,共享算法本次运行的种群个体历史最优信息、当前全局最优信息,及前几次运行过程中的种群个体历史最佳信息.通过5个经典函数的仿真实验测试,验证了该算法具有较强的全局搜索能力和收敛性.     

一种拟随机初始化模拟退火粒子群算法

针对粒子群优化算法在求解高维问题时易出现的早熟收敛、停滞现象,提出一种拟随机初始化模拟退火粒子群算法.采用Hammersley方法对算法进行初始化,可以提高算法在高维搜索空间的搜索能力,进一步将模拟退火思想引入到粒子群优化算法中,结合粒子群优化算法的快速寻优能力和模拟退火算法的概率突跳特性,使算法具有跳出局部最优从而实现全局最优的能力.分别在5个经典测试函数上测试算法的性能,仿真实验结果表明,提出的算法有效克服了传统粒子群优化算法在求解高维空间优化问题时易出现的停滞现象,在进化后期仍保持较强的搜索能力,提高了传统粒子群优化算法在高维空间的全局寻优能力.     

一种搜索空间自适应变化的自适应粒子群算法

提出一种搜索空间自适应的自适应粒子群优化算法.该算法对不同等级的粒子适应值采取不同的惯性权重,并随着算法的迭代不断缩小粒子群的搜索空间.同时,选择当前代的较优部分粒子直接进入下一代,其他粒子通过在缩小的搜索空间内随机生成,加快了种群收敛速度,同时又能使种群不断跳出局部最优解.几种典型函数的仿真实验表明,该算法在收敛速度...     

改进粒子群算法在三维水翼设计中的应用

对基本粒子群算法的权重进行改进,采用非线性权重,使得粒子在整个寻优过程中加速向最优解靠拢,从而快速收敛得到最优解.选取Rastrigin函数和Quadric函数为验证函数,对改进粒子群算法进行验证,改进粒子群算法具有更快更优的搜索性能.将其引入到三维水翼的优化设计中,分别以升阻比和压力分布为优化目标,以三维水翼的升力系数为限制条件,进行迭代优化.优化后三维水翼的升阻比及压力分布得到明显改善,验证了改进粒子群算法在三维水翼优化设计中应用的可行性及有效性.     

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     

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