求解奇异非线性方程组的粒子群优化算法

奇异非线性方程组是一类十分重要也比较困难的问题,基于粒子群优化算法提出了一种求解奇异非线性方程组的新方法.先把奇异非线性方程组转化为无约束优化问题,然后与人工智能算法相结合,利用标准粒子群优化算法求解.此算法不但不受方程组的连续性、光滑性的限制,而且避免了大量的求导计算,得到了极为精确的数值解.数值仿真结果显示了算法的有效性和可行性.该方法为求解奇异非线性方程组提供了一种有效、可行的新算法,也扩大了粒子群算法的应用领域.     

量子行为粒子群优化算法在几何约束问题上的应用

几何约束问题可以等价为求解非线性方程组问题,同时也可以将几何约束问题转化为一个优化问题来求解.受经典粒子群优化算法和量子动力学启发,提出一种新的算法——量子行为粒子群优化算法(QPSO)来求解几何约束问题.在QPSO模型里,粒子的状态不再通过位置和速度来决定,而是通过一个波函数来确定.这种算法的主要优点就是可以在感兴趣的问题上保持种群的多样性.实验结果表明,该方法可以提高几何约束求解的效率和收敛性.     

粒子群优化算法求解非线性问题的应用研究

引入粒子群优化算法求解非线性方程组,利用粒子群优化算法所具有的群体智能和记忆功能,较快地求解复杂非线性方程组的最优解,克服了牛顿-拉普辛方法求解该类问题时对初值的敏感性以及需要函数求导的困难,同时无需关心方程组的具体形式.将该算法应用于几何约束问题的求解,取得了良好效果.     

非线性混合整数规划问题的改进量子粒子群算法

提出了一种改进的量子粒子群算法,并将该算法用于求解非线性混合整数规划问题。构造了一种自适应调整的惯性权重,平衡了算法的全局搜索和局部搜索能力;针对混合整数规划问题,给定一定比例的初始可行解,提高了初始种群解的多样性;利用协同进化选择策略,对种群中的不可行解重新生成,使种群中每个粒子的信息充分利用,从而提高算法的收敛速度;为了抑制算法的早熟现象,给出了一种新的混沌搜索方式,对全局最优解进行局部搜索,增强算法的局部搜索能力。通过16个常见的测试函数测试结果表明,改进的量子粒子群优化算法对求解非线性混合整数规划问题,在成功率和精度方面得到很大的提高。     

求解约束优化问题的改进粒子群优化算法

针对约束优化问题,提出了一种改进的粒子群优化算法.该算法利用罚函数法将约束优化问题处理为无约束优化问题,并利用可行基规则来更新个体极值和全局极值,使不可行的粒子尽快飞向可行域,显著提高了算法的全局搜索能力.在标准粒子群算法研究基础上,为了提高粒子群算法求解非线性复杂优化问题的性能,对速度方程和惯性权重做了改进.数值算例表明,该算法是求解约束优化问题的一种较为有效的全局优化算法.     

基于多目标量子粒子群算法的环境/经济调度

针对传统的粒子群优化算法在求解环境/经济调度中存在控制参数多和局部搜索精度低等问题,提出一种基于多目标量子粒子群优化算法的环境/经济调度问题的求解方法.该算法利用具有量子行为特性的粒子搜索解空间,引入改变作用区间的变异算子增强全局搜索能力,并采用基于粒子多样性的方法更新全局最优的领导粒子.仿真结果表明,该算法是有效的,所求Pareto解集能逼近真实的Pareto解集且具有良好的分布性.     

量子粒子群算法求解整数规划的方法

粒子群算法主要用于优化连续性问题。如果用于求解整数规划问题,算法的粒子位置必须解决取整问题;而量子粒子群算法求解整数规划问题具有更高的效率。利用三种取整方法与量子粒子群算法结合,求解非线性整数规划问题,并且与标准粒子群算法求解整数规划问题进行比较。通过对基准函数仿真实验,比较了六种方法求解整数规划问题。实验结果表明,基于随机取整的量子粒子群算法搜索成功率优于其他五种方法,其综合搜索效率更佳。寻找了一种更优的求解整数规划方法。     

粒子群算法的改进及其在求解约束优化问题中的应用

在用粒子群算法求解约束优化问题时, 处理好约束条件 是取得好的优化效果的关键. 通过对约束问题特征和粒子群算法结构的研究, 提出求解约束 优化问题一种改进的粒子群算法, 该算法让每个粒子都具有双适应值, 通过双适应值决定粒 子优劣, 并提出了自适应保留不可行粒子的策略. 实验证明, 改进的算法是可行的, 且在 精度与稳定性上明显优于采用罚函数的粒子群算法和遗传算法等算法.     

一种改进PSO算法在经济调度中的应用研究

粒子群优化算法是一类新的基于群体智能的启发式全局优化技术,群体中的每一个粒子代表待解决问题的一个候选解,算法利用粒子之间的相互作用发现复杂问题解空间的最优候选区域.综述了算法的基本形式及其多种改进形式,通过比较提出了一种用于求解一般形式的非连续、非凸、非线性约束优化问题的改进粒子群算法,用于求解复杂的非凸、非线性电力系统经济负荷分配问题.仿真结果表明,所提出的方法搜索速度快,求解精度高,易于掌握,是解决电力系统经济负荷分配问题的有效手段.     

利用改进的遗传算法求解非线性方程组

提出一种改进的求解非线性方程组的浮点遗传算法,算法通过把非线性方程组的求解问题转化为约束优化问题,然后将局部搜索信息引入遗传算法,通过改进的变异算子不断调整搜索区域,最终搜索到含有最优解的区域,再利用局部搜索信息提高解的精度.数值实验结果表明,改进后的浮点遗传算法具有较好的全局优化能力和局部搜索能力,且提高了求解的速度和解的精度.     

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.     

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