最小控制集问题的群集策略智能算法研究

图的最小控制集是一个经典的NP完全问题,其广泛应用在生物信息学、计算机通讯、工程设计等方面。目前搜索最小控制集算法有多种,例如:贪心算法、模拟退火算法、基于禁忌搜索的模拟退火算法等。当搜索结构复杂的多点图时,很多算法的搜索效果并不好。为了提高搜索效果,提出并实现一种群集策略智能算法;同时还对群集策略算法进行了非常重要的扰动改进。为了验证算法的搜索效果,利用Petersen图和随机图完成了对群集策略算法的搜索测试实验;同时也完成了对群集策略算法、贪心算法、基于禁忌搜索的模拟退火算法的比较测试实验,通过实验结果也验证了群集策略算法搜索效果最好。     

基于MMHC算法的贝叶斯网络结构学习算法研究

贝叶斯网络是人工智能领域研究不确定环境下知识表示和因果推理的有效工具之一,迄今为止已经提出了许多贝叶斯网络结构学习算法.MMHC算法是一种较新的贝叶斯网络结构学习算法,该算法的评分搜索阶段应用了贪婪搜索算法,但该算法容易陷入局部最优而无法得到全局最优网络,针对该缺点,在MMHC算法的评分搜索阶段应用模拟退火、随机重启爬山搜索、禁忌搜索3种搜索策略取代贪婪搜索,详尽的实验结果表明在MMHC算法中这3种搜索算法的效果普遍优于贪婪搜索,其中模拟退火搜索学习效果最好,MMHC算法的评分搜索阶段可以用模拟退火搜索替代贪婪搜索达到提升算法的学习效果.     

基于全局最优值的群搜索优化算法

标准群搜索优化(group search optimizer,GSO)算法在搜索的前期易于陷入局部最优,造成收敛速度变缓甚至在搜索时停滞等问题。针对以上问题对GSO算法进行改进,提出一种基于全局最优值的群搜索优化(global optimal value-based group search optimizer,GGSO)算法,弥补标准群搜索优化算法在搜索的前期易于陷入局部最优的缺陷。通过在GSO算法搜索过程中加入全局最优值方式,改进"发现者–加入者"模型,从而加快算法收敛速度。11个国际标准测试函数的对比实验表明,GGSO算法无论在算法精度还是收敛速度上都优于标准GSO算法。     

烟花搜索导向的多路启发式聚类算法

启发式聚类算法具有收敛速度快、易实现等优点,但初始解敏感,严重影响了聚类算法的质量。针对这一问题,提出了一种烟花搜索导向的多路启发式聚类算法。该算法通过多次调用经典启发式聚类算法,产生多个局部最优解;在搜索空间中以多个局部最优解为搜索起点,采用烟花搜索进行多路搜索;基于信息熵浓度设计烟花选择算子确定搜索方向;再经过变异、映射、偏移算子变换局部最优中心点,以发现质量更好的搜索起点;直至算法收敛获得新的搜索起点;最终以新的搜索起点调用经典启发式聚类算法获得高质量聚类结果。实验结果表明,烟花搜索导向的多路启发式聚类算法在不同数据集上的聚类质量明显高于对比其他聚类算法的聚类质量。     

基于Powell搜索法的简化微粒群算法

利用Powell搜索法求解精度高、收敛速度快和局部强搜索能力强等优点,在简化微粒群算法的基础上,结合Powell搜索法,提出一种新型简化微粒群算法—Powell-SPSO算法.改进算法将Powell搜索法融合在简化微粒群算法中,让Powell搜索法与简化微粒群算法进行交替搜索.同时微粒的迭代利用了Powell搜索法的强搜索能力,使得算法改善了简化微粒群算法因每个微粒采用相同迭代公式进行进化而造成的微粒间的弱差异性,避免了易出现早熟、搜索速度慢等缺点.仿真结果表明,与标准微粒群算法(PSO)、简化微粒群算法(SPSO)、文献[10]算法相比较,不论是对高维函数还是低维函数,改进的算法都能够有效地避免早熟问题,并能显著地提高收敛速度和收敛精度.     

基于变邻域搜索改进的冲突解脱粒子群算法

飞行冲突解脱是航空器安全运行的关键,粒子群优化(particle swarm optimization,PSO)算法和变邻域搜索(variable neighborhood search,VNS)算法都可以用于解决飞行冲突,但PSO算法接近最优解时收敛速度降低,VNS算法的全局搜索能力较差。为融合PSO算法全局搜索的快速收敛特性和VNS算法的局部搜索能力,提出了变邻域搜索改进的粒子群优化算法。仿真结果证明该算法能够快速搜索到全局最优解,继承了二者的优势,同时提高了最终解脱航迹的适应值,并减少了收敛时间。     

蚁群算法搜索熵研究

借鉴信息熵,提出蚁群算法的熵模型,定义蚁群算法的3种搜索熵,讨论了搜索熵同算法搜索能力和收敛性之间的关系,给出了2个简化模型的基于搜索熵的收敛性判定定理,并利用搜索熵讨论了参数选择对蚁群算法的影响.     

基于单纯形法的人工蜂群算法改进研究

人工蜂群算法中的侦察蜂阶段的搜索操作在一定程度上可以解决算法陷入局部最优的问题,但也和其他启发式优化算法一样,存在着局部搜索能力差,在接近最优解时搜索效率下降,以及求解复杂问题时可能陷入局部最优而使算法停滞等缺陷。为了改善此缺陷,采用NM算法来取代人工蜂群算法侦察蜂阶段的随机产生个体机制,提出了一种基于NM算法的改进人工蜂群算法(NMABC)。希望基于NM算法优异的局部搜寻能力,改善人工蜂群算法局部搜索能力较差之缺陷并提高搜索效率。     

一种新的运动估计算法

基于搜索起点的预测和梯度下降搜索,提出了十字交叉梯度下降搜索(CCGDS)算法。该算法根据运动矢量的中心分布特性设计了相应的匹配搜索模板。仿真结果表明:该算法可以用较小的搜索代价取得与全搜索相当的效果,且在搜索速度与搜索效果方面优于三步法(TSS)、四步法(FSS)和钻石法(DS)。     

一种改进的自适应和声搜索优化算法

在传统和声搜索优化算法的基础上,提出一种自适应双子和声搜索优化算法。通过建立主辅两个和声库正反双向进行迭代搜索,并对和声算法中的音调调整概率和音调微调带宽两个重要参数进行自适应调整,提高了算法的动态适应性以及局部搜索和全局搜索的协调能力。通过构造两组搜索方向各异、相互协同的主、辅和声,充分利用了搜索域内的隐含信息,扩展搜索范围,从而实现了全局最优。在试验中分别对3个复杂函数进行测试,结果表明该算法具有较好的全局搜索能力和收敛速度,在一定程度上提高了最优值的搜索能力,达到了预期效果。     

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