基于小波分析法与神经网络法的非平稳风速信号短期预测优化算法

为提高传统神经网络对非平稳风速的预测精度,提出一种基于小波分析法与神经网络法混合建模的优化算法。该优化方法引入小波分析法对实测非平稳风速信号进行分解,将非平稳性原始风速序列转化为多层较平稳分解风速序列,再利用BP神经网络对各分解层风速序列建立预测模型,最终加权各层预测结果获得风速超前多步预测结果。仿真结果表明:该优化算法实现了风速的高精度短期多步预测,将传统神经网络法对应超前步数的平均绝对相对误差分别提高了55.56%,32.43%和34.58%,其超前1步、3步和5步预测的风速平均相对误差分别为0.48%,1.50%和2.97%。优化网络具备信号分解与自学习能力。     

基于最小二乘支持向量机的风速组合预测模型

探讨了基于最小二乘支持向量机的组合预测模型在风速短期预测中的可行性.该模型以BP神经网络、RBF神经网络、粒子群BP神经网络3种预测模型的风速预测值作为组合预测模型的输入,实际风速值为输出,利用最小二乘支持向量机回归算法构造风速间的非线性关系,以实现风速多步预测.将该模型的预测性能与BP神经网络组合预测模型、线性组合预测模型进行比较,通过平均绝对误差、误差平方和、平均相对误差3个指标进行评价.结果表明,最小二乘支持向量机预测模型的平均相对误差低于6%,其他误差指标也明显低于其他预测模型.因此,最小二乘支持向量机组合预测模型预测精度不仅高于任一单项预测模型预测精度,而且高于传统的线性组合预测模型与一般BP神经网络组合预测模型.验证了该模型在风速预测中的可行性.     

结合纹理特征和深度学习的行人检测算法

针对行人检测算法中存在特征鲁棒性差及分类器拟合非线性数据能力弱等问题,提出一种基于纹理特征和深度学习分类算法的行人检测方法.提出一种改进的GSRLBP纹理特征提取算法,提取行人图像的局部纹理特征,通过获取像素点的梯度信息结合GSRLBP算法消除微小扰动对行人特征提取的影响,进一步增强特征提取的鲁棒性.搭建基于深信度网络的深度学习行人样本分类器,利用多层受限波兹曼机搭建分类器输入端和中间层,将行人纹理特征信息逐层转化和传递,实现特征数据的自学习,利用BP神经网络搭建分类器的输出端,实现分类器结构的自优化.研究结果表明,该算法可行、有效,且性能优于经典浅层机器学习行人检测算法.     

多层局部回归网络的非线性系统预测模型

提出采用多层局部回归神经网络建立多变量非线性系统多步预测模型的方法,神经 网络模型可提供多步预测控制所需要的系统输出预测值及输出向量对控制向量的雅可比矩 阵．仿真试验表明这种动态神经网络的预测模型具有较高的精度．     

受限玻尔兹曼机的步态特征提取及其识别

针对步态识别问题,研究了受限玻尔兹曼机的步态特征提取及其识别.主要基于行人图像序列,通过背景分割、归一化以及步态周期的计算,采用叠加方法生成步态能量图,以此作为步态的特征图像,利用受限玻尔兹曼机自动获取步态特征.选取中科院CASIA步态数据库以及支持向量机、孪生支持向量机、神经网络与K-近邻方法对使用受限玻尔兹曼机方法的特征提取进行了研究,同时与主成分分析PCA、线性判别分析LDA、卷积神经网络CNN特征提取与识别方法进行了比较.     

改进的PSO-RBF神经网络在联合制碱中的应用

联合制碱过程是一类典型的复杂工业过程,具有时变、非线性、不确定性等特征,在线控制模型难以建立。针对联合制碱复杂工业过程控制精度不高、鲁棒性差等问题,提出一种改进的PSO-RBF神经网络控制算法。将粒子群优化算法和径向基神经网络相结合,使用改良的粒子群优化算法对RBF神经网络的隐含层基函数中心、宽度和输出层的连接权值进行寻优,建立基于改进的PSO算法优化后的RBF神经网络模型。将改进的PSO-RBF神经网络控制模型应用到联合制碱的关键工序碳化过程中,并与先前应用的模糊神经网络控制模型进行比较,经仿真研究验证表明,在联合制碱碳化过程中应用改进的PSO-RBF神经网络控制算法,其控制精度和系统鲁棒性得到了有效的提高,为解决一类复杂工业过程的建模与优化控制方法研究提供了有效的技术途径。     

用于孤立数字语音识别的一种组合降维方法

针对孤立数字语音识别的噪声鲁棒性问题,提出了一个组合降维方法。该方法由梅尔频率倒谱系数(MFCC)特征提取、线性降维、受限玻尔兹曼机(RBM)、Softmax分类器4个功能模块依次组成;基于主成分分析(PCA)基本原理对MFCC特征向量实现了降维并且统一维度的目的;通过RBM对降维后的特征向量进行学习,改善了后端Softmax分类器的分类性能,RBM的预训练由对比散度算法完成,微调过程使用共轭梯度算法。采用TI-46孤立数字语音库和NOISEX-92典型噪声数据库对方法进行了测试,实验结果表明,该方法可以获得96.09%的正确识别率,相对于常规神经网络识别方法,噪声鲁棒性得到了提高。     

基于LSTM神经网络的畸形波预测

采用长短时记忆(LSTM)神经网络预测方法对某岛礁地形模型的四个典型波浪试验数据进行预测分析,并建立了单步和多步预测模型.首先对波高时间序列数据进行归一化处理;然后建立了包括输入层、隐藏层和输出层的LSTM网络模型框架;最后对测试样本进行单步预测,将预测结果与支持向量机(SVM)模型和反向传播(BP)模型进行了对比.结果表明:LSTM神经网络预测精度有明显优势;多步预测中,提高预测时长其预测精度并无明显降低.     

基于量子粒子群-径向基神经网络模型的风速预测

风速预测对风电场和电力系统的运行都具有重要意义.为了提高风速预测的精度,提出了一种基于量子粒子群-径向基神经网络模型,在确定网络隐含层节点数后,将RBF网络的参数编码成优化算法中的粒子个体进行优化,在全局空间搜索最优适应值的参数.用优化后的神经网络进行风速预测,实例结果表明该算法在预测速度和精度上都得到了提高.     

基于神经网络的短期电力负荷预测及其MATLAB实现

针对短期电力负荷预测问题,利用MATLAB软件建立日最高温度、日最低温度、日平均温度和平均湿度等气象因素对电力负荷的回归预测模型,具体对比给出BP神经网络与NARX神经网络两种回归预测结果,并通过对隐含层网络参数的调试对BP神经网络进行了适当的改进.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-