基于高斯变异与Levy飞行策略的混合粒子群优化算法

目的 解决粒子群算法易陷入局部最优解、出现早熟收敛从而导致求解精度不高的缺陷.方法 将高斯变异(Gaussian M utation)、Levy飞行策略与基本粒子群优化算法(PSO)进行混合,提出一种称为GLPSO混合粒子群算法.在该算法中粒子通过Levy飞行更新自己的位置,若粒子在若干次迭代后无法产生更优值,则在保存当前最优值的前提下进行高斯变异来保持种群多样性.结果 与结论通过对基准测试函数优化的实验结果对比,GLPSO在5个基准测试函数中的优化精度和全局搜索能力优于其他对比算法,GLPSO有更加出色的全局搜索能力和更高的求解精度.     

基于表现型共享的多目标粒子群算法研究

在多目标粒子群算法中,粒子的飞行由自身的最优位置和指导粒子决定,如何定义适应度选出合适的指导粒子,指导搜索过程向全局Pareto最优区域飞行,并保持种群在最优前端的多样性是算法的关键问题.针对上述问题,构造了同时考虑粒子的Pareto占优情况和目标空间邻近密集度的表现型共享适应度函数,在此基础上提出一个基于表现型共享的多目标粒子群优化算法(MOPSO).为了验证算法的有效性,采用占优等级指标来分析近似解集的占优情况,并采用EPS、HYP和R2指标来衡量解集的分布情况.实验结果表明,算法具有较强的全局搜索能力,能在较小的计算代价下获得较好的Pareto前端近似.     

一种改进的粒子群优化算法

在粒子群优化算法的基础上,将粒子群优化算法的速度更新公式中种群最优位置用所有个体的平均值与最优粒子有限邻居个体的平均值加权求和代替;通过将种群平均适应度和整体最优位置适应度的比值作为适应度函数,并引入了加速系数;得到改进的粒子群优化聚类算法既能够充分参考当前粒子的最优信息,也参考了所有个体的最优信息和当前最优粒子有限邻居的最优信息,在进化过程中可以通过新的适应度函数自适应地调整全局搜索和局部搜索的比重对粒子的影响,对算法收敛速度影响较小的前提下较好地提高了收敛精度。最后,选取了4组具有不同分布特征的Benchmark函数作为验证函数,试验结果表明,新算法具有较好的收敛特性。     

全局粒子群优化算法

针对粒子群优化算法在解决大维数的无约束优化问题时具有较差的收敛性和稳定性,提出了一种全局粒子群优化(GPSO)算法.GPSO算法引入了一种新的惯性权重,它被定义为一个指数型函数与一个随机数的乘积,这有利于维持算法的全局搜索和局部搜索.同时,GPSO算法对全局最优解进行了小的扰动,这可以有效地避免算法早熟.使用三种粒子群优化算法来解决6个无约束优化问题.仿真结果说明,与其他两种粒子群优化算法相比,GPSO算法具有更快的收敛速度和更强的逃离局部最优的能力.     

两群替代微粒群优化算法及其应用

提出一种两群替代微粒群优化算法（TSSPSO）,并对算法参数进行分析和对算法方程进行修正。该方法将微粒分成飞行方向不同的两分群,其中一分群微粒朝着最优微粒飞行,另一分群微粒朝着相反方向飞行;飞行时,每一微粒不仅受到微粒本身飞行经验和本分群最优微粒的影响,还受到全群最优微粒的影响。搜索时,每一次迭代均以一定的替代率用一分群中若干优势微粒取代另一分群中相同数目的劣势微粒。对4种常用函数的优化问题进行测试并进行比较,结果表明：两群替代微粒群优化算法比基本微粒群优化算法更容易找到全局最优解,优化效率和优化性能明显提高。将两群替代微粒群优化算法用于常压塔汽油干点软测量,建立基于两群替代微粒群优化算法的汽油干点神经网络软测量模型,通过与实际工业数据的比较,表明基于两群替代微粒群神经网络的软测量模型精度高、性能好。     

一种改进的混合粒子群优化算法

为了提高粒子群优化算法的局部搜索能力、算法的收敛速度和解的精度,提出了一种改进的混合粒子群优化算法。采用聚类方法和混沌初始化、同时引入线性组合式局部搜索过程,通过四个标准函数的测试实验,与标准粒子群优化算法、混沌粒子群优化算法进行比较分析,提出的算法寻找全局最优解的能力有显著的提高,算法收敛速度和解的精度均优于其它参与比较的算法。     

多粒子群协同优化算法

提出一种多粒子群协同优化(PSCO)方法．PSCO是2层结构：底层用多个粒子群相互独立地搜索解空间以扩大搜索范围;上层用1个粒子群追逐当前全局最优解以加快算法收敛．这些粒子群含的粒子数以及粒子状态更新策略不要求相同．为改善粒子群容易陷入局部极小的弱点,提出扰动策略,当1个粒子群的当前全局最优解未更新时间大于扰动因子时,重置粒子的速度,迫使粒子群摆脱局部极小．用Rosenbrock函数等3种基准函数做优化实验表明,PSCO性能优于经典PSO,FPSO和HPSO等算法．     

一种改进的完全信息粒子群算法研究

为了提升粒子群算法求解复杂的多峰问题的能力,提出一种改进的完全信息粒子群算法(IFIPSO).对粒子自身最优位置的运行,进行变异操作以增加种群的多样性; 同时,引入并改进完全信息粒子群算法,使得粒子充分地向自身邻居的历史最优位置进行学习,提升种群向最优解飞行的概率.在基准函数的测试中,结果显示IFIPSO算法相比其它算...     

基于坐标旋转角的均值粒子群优化算法

文中提出了基于坐标旋转角的均值粒子群算法,其原理是:在每次迭代中,粒子的下一个飞行位置的方向与当前最好位置的方向之间偏角较大时,则粒子的位置和速度更新中加入一个角度来改变位置和速度的方向,同时角度也更新。通过典型函数优化实验表明,本文算法具有较高的计算精度和较快的收敛速度。     

三群协同粒子群优化算法

针对基本粒子群优化算法易陷入局部极值点、搜索精度低等缺点,提出了一种三群协同粒子群优化算法(TSC-PSO)。搜索时,如果全局极值连续若干代没有改善,粒子未找到全局最优点,就任选某个优群,将其群内粒子和差群粒子交换。仿真结果显示,对一些经典多峰值函数、非凸病态函数,TSC-PSO增强了全局搜索能力,具有比基本PSO更好的优化性能。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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-