基于进化规划的网络多目标路由算法

多目标路由问题要求极小化网络带宽资源消耗 ,它与图论中 NP完全的 Steiner问题等价 ,不存在多项式时间算法 ,只能采用近似算法或启发式算法 .进化算法是一类有效求解优化问题的新算法 .应用进化算法中的进化规划方法 ,求解 Steiner问题 ,提出了一种新的多目标路由算法 .仿真结果显示 ,该算法性能高于启发式方法     

基于蚁群全局优化的二层规划模型与仿真

二层规划问题通常是一个非凸问题,因此在实际工程领域对其进行求解具有极大的困难.研究了问题的本质特征,提出了一种组合设计算法模型——基于蚁群算法求解二层规划问题的全局优化策略.组合算法采用蚁群算法求解上层问题,下层的线性规划问题则采用单纯型算法完成求解.设计的组合算法思路清晰,仿真计算结果表明,该算法有着良好的全局收敛可靠性和较高的收敛速度,是目前求解此类两层线性规划问题的一种有效算法.     

自由边界问题的自适应预测-校正算法

对一类自由边界问题,提出了基于线性互补问题的自适应预测-校正算法.用有限差分对微分模型离散化后得到一个正定线性互补问题,该问题等价于一个不动点问题,从而得到求解线性互补问题的自适应预测-校正算法.用正定性及投影基本性质可证明算法收敛性.给出了具体的算法过程,数值结果表明了算法的可行性和有效性.     

一种改进的粒子群优化算法

提出一种改进的粒子群算法(EDAPSO).这种改进算法结合分布估计算法的探索能力和粒子群算法的开发能力.首先利用EDAPSO算法解决无约束的问题,并且比较EDAPSO算法与其他三种经典的粒子群算法的结果.无约束问题的实验结果表明:EDAPSO算法可以找到更好的解,并且稳定性更高.然后EDAPSO算法被用来解决含有13个单元的电力系统的负荷经济分配问题.实验结果表明:EDAPSO算法所获得的解比近期文献所报道的解好.     

仿生优化算法及其在函数优化问题中的应用

仿生优化算法是一类解决函数优化问题的更好方法.本文基于遗传算法、蚁群算法和人工鱼群算法的基本原理,探讨了各种算法在求解函数优化问题中的应用.两个典型函数极值问题的数值实验表明,这三种仿生优化算法在求解函数优化问题中具有良好的优化性能,其中鱼群算法性能最好.     

结合优先指派规则的车间作业问题的枚举算法

车间作业调度问题是一个典型的NP完全问题,这种问题的精确求解算法的计算时间会随着问题实例规模的增大而呈指数增加.针对车间作业调度问题的难解性,给出了一个求解该问题的快速枚举算法.该算法是按照枚举算法的一般步骤来进行设计的,在设计过程中对于算法所涉及到的初始解问题、分枝问题以及剪枝策略等问题给出了旨在减少算法计算时间的解决方案.该算法找到了所测试的9个标准算例中4个算例的精确最优解.     

一种基于Minmax算法的混合MIMIC算法

将Minmax算法与MIMIC算法相结合,提出一种基于Minmax算法的混合MIMIC算法.该算法不再利用传统的约束保持法和可行规则法处理约束条件,而是结合Minmax算法的思想将约束问题转化为无约束问题,并利用MIMIC算法对无约束问题求解.数值试验结果表明:该算法能收敛到满足约束条件的全局最优解,并且具有很强的全局搜索能力,为解决非线性约束优化问题提供了一种新的有效途径.     

用蚁群算法求解旅行商问题

介绍了一种用于解决复杂优化问题的新的启发式算法--蚁群算法.阐述了该算法的基本原理、算法模型和在旅行商问题中的具体应用过程.研究表明该算法具有并行性,鲁棒性等优良性质.     

基于混合蛙跳算法的背包问题求解

混合蛙跳算法(SFLA)是一种全新的后启发式群体进化算法,具有高效的计算性能和优良的全局搜索能力.背包问题是一个典型的 NP完全问题.首先建立了背包问题基于 0/1规划的数学模型,阐述了混合蛙跳算法的基本理论.针对离散搜索空间,提出了SFLA的改进算法,应用该算法解决了背包问题.在实例上的运行结果表明本文方法的可行性和有效性.     

遥感卫星地面站资源调度的混合分解算法

针对传统算法逐渐难以满足地面站资源调度对精度和时效要求的问题, 提出一种混合分解算法. 该算法结合基于地面站资源使用冲突程度评价指标的启发式算法和Lagrange分解算法对问题进行求解, 以加快对最优解的搜索速度. 仿真测试结果表明, 该算法能在较短时间内得到遥感卫星地面站资源调度问题的高质量解.     

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.     

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