基于支持向量机的啤酒企业能源消耗预测模型

为提高啤酒企业包装车间生产耗电的预测精度, 提出了一种基于支持向量机和粒子群优化算法的预测模型构建方法。该方法将radial basis function函数作为支持向量机的核函数构建预测模型, 使用K-fold交叉验证方法, 利用粒子群算法(PSO: Particle Swarm Optimization)对惩罚参数c和g值寻优。以28天的生产耗水和生产耗电数据作为训练集, 以10天的生产耗水数据作为预测集, 分别构建基于radial basis function函数与polynomial函数的生产耗电支持向量机预测模型对生产耗电数据进行预测。实验结果表明, 以radial basis function函数作为核函数与以polynomial函数作为核函数相比, 该支持向量机预测模型对生产耗电的预测精度提高了51.495%,该方法具有一定的实用性。     

金融时间序列预测中的GA-SVR方法

针对支持向量机方法在金融时间序列预测的过程中,模型参数选取不当的导致预测精度较低等问题,利用遗传算法优化选取支持向量机模型参数,建立了一种基于遗传算法优化支持向量机参数的金融时间序列预测模型。并将该方法应用于我国上证指数时间序列预测中。实验结果表明基于遗传算法优化的支持向量机方法能较好的反映金融时间序列预测规律,并且提高了模型预测精度。     

基于混合核函数的PSO-SVM分类算法

在数据挖掘中,支持向量机是被广泛应用的一种分类算法,其核函数的选择及参数的设定没有有效的标准。本文采用混合核函数构造兼顾学习能力和泛化性能的支持向量机算法,并利用粒子群算法来确定支持向量机的参数。应用基于混合核函数的PSO-SVM算法对一个经典的分类测试数据集进行分类,将该算法与单一核函数支持向量机算法的分类结果进行比较,结果表明所提出的算法的分类性能有明显提升。     

GA优化支持向量机用于混沌时间序列预测

介绍了利用支持向量机与重构相空间理论预测混沌时间序列的方法，并以股价时间序列为样本，比较了几种常用核函数的预测能力，实验表明高斯核的预测能力明显好于其它核．使用遗传算法优化了高斯核支持向量机的参数，优化后其预测能力较经验定参方法有明显提高，且好于传统的预测方法．     

用于SVM说话者确认系统的序列核

为了更好的将区分式分类方法应用于说话者确认系统中,该文提出了一种应用于支持向量机(supportvector machine,SVM)说话者确认系统的新型序列核,通过Gauss混合模型训练出每个说话人模型超向量作为支持向量机的输入样本,然后根据Gauss混合模型之间的Kullback-Leibler距离度量构造的SVM序列核函数对超向量进行训练和判决.在美国国家标准与技术研究所(NIST)2004和2006年说话人识别数据库上的实验证明了该核函数能在一定程度上提升整个说话者确认系统的识别精度和鲁棒性.结果表明,本文提出的应用于说话者确认系统中的核函数不仅具有明确的物理意义,而且改善了识别系统的性能.     

优化的混合核函数相关向量机在发酵过程建模中的应用

针对相关向量机中核函数选择问题进行研究,提出一种局部性高斯核函数和全局性sigmoid核函数结合的相关向量机建模方法.采用差分进化算法对混合核函数构成的相关向量机的参数进行优化,提高了模型的预测精度.将参数优化后的混合核函数相关向量机用于青霉素发酵过程的软测量建模,得到比单一核函数所建模型更优的预测精度.     

一种近似于支持向量机的分类模型

针对线性可分与非线性可分问题,讨论了支持向量机分类模型及核函数的选择.为避免支持向量机的核函数及参数选择的不确定性,提出一种近似于支持向量机的分类模型,并通过心脏病预测实例对两种模型进行了比较.     

PSO-SVR在果酒生物活性物质预测中的应用

针对BP神经网络和遗传算法对果酒生物活性物质预测存在速度慢和精度低的缺点,建立了基于支持向量回归机(SVR)的果酒生物活性物质预测模型。鉴于支持向量机模型的精度和泛化能力很大程度取决于不敏感损失系数ε、惩罚系数C和RBF核函数的宽度系数γ三个参数,模型采用粒子群算法对三个参数同时进行优化,实现了果酒生物活性物质的非线性预测。仿真结果表明:基于PSOSVR算法的果酒生物活性物质预测模型性能优于所比较的BP神经网络模型和支持向量回归机模型,能有效提高果酒生物活性物质的预测精度和稳定性。     

不同核函数SVM在居民出行方式预测模型中的应用

采用持向量机方法构建了居民出行方式选择模型,使用网格搜索方法选择支持向量参数,避免参数选择的随机性,分析不同核函数对模型构建的影响。研究表明,采用多项式核函数、RBF核函数构建的支持向量机模型对居民出行方式预测精度较高,所构建的模型可用于居民出行方式预测;在支持向量机核函数选择中,优先选择RBF核函数,其次为多项式核函...     

基于主成分分析和支持向量机的区域降水预测应用研究

将主成分分析和支持向量机回归相结合, 以广西5、6月区域平均日降水量作为预报对象, 进行区域日降水量预测研究.首先,整理分析大量的T213数值预报产品信息数据进行主成分分析, 得到主成分数据序列; 其次, 根据主成分数据序列建立训练集训练支持向量机, 并利用遗传算法优化参数; 最后, 输入支持向量机所需数据, 得到主成分预测结果, 建立广西日降水预报模型. 实例计算结果表明, 支持向量机回归模型比逐步回归模型有更好的预测能力.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the