Similarity measurement method of high-dimensional data based on normalized net lattice subspace

The performance of conventional similarity measurement methods is affected seriously by the curse of dimensionality of high-dimensional data.The reason is that data difference between sparse and noisy dimensionalities occupies a large proportion of the similarity,leading to the dissimilarities between any results.A similarity measurement method of high-dimensional data based on normalized net lattice subspace is proposed.The data range of each dimension is divided into several intervals,and the components in different dimensions are mapped onto the corresponding interval.Only the component in the same or adjacent interval is used to calculate the similarity.To validate this method,three data types are used,and seven common similarity measurement methods are compared.The experimental result indicates that the relative difference of the method is increasing with the dimensionality and is approximately two or three orders of magnitude higher than the conventional method.In addition,the similarity range of this method in different dimensions is [0,1],which is fit for similarity analysis after dimensionality reduction.

Numerical study on three-dimensional flow field of continuously rotating detonation in a toroidal chamber

Gaseous detonation propagating in a toroidal chamber was numerically studied for hydrogen/oxygen/nitrogen mixtures. The numerical method used is based on the three-dimensional Euler equations with detailed finiterate chemistry. The results show that the calculated streak picture is in qualitative agreement with the picture recorded by a high speed streak camera from published literature. The three-dimensional flow field induced by a continuously rotating detonation was visualized and distinctive features of the rotating detonations were clearly depicted. Owing to the unconfined character of detonation wavelet, a deficit of detonation parameters was observed. Due to the effects of wall geometries, the strength of the outside detonation front is stronger than that of the inside portion. The detonation thus propagates with a constant circular velocity. Numerical simulation also shows three-dimensional rotating detonation structures, which display specific feature of the detonation- shock combined wave. Discrete burning gas pockets are formed due to instability of the discontinuity. It is believed that the present study could give an insight into the interest- ing properties of the continuously rotating detonation, and is thus beneficial to the design of continuous detonation propulsion systems.

Infinite Three-Dimensional Coordination Polymers: Synthesis and Structures of [Cd (4,4'-bpy)_2 (H_2O)_2]_n (pic)_(2n),[Zn (4,4'-bpy)_2 (H_2O)_2]_n(pic)_(2n) (H_2O)_(2n), and [Zn (4,4'-bpy)_2 (H_2O)_2]_n (4,4'-bpy)_n(H_2O)_n (pic)_(2n)

Three Complexes of the formula [Cd (4,4'-bpy)_2 (H_2O)_2]_n. (pic)_(2n) (1) [Zn (4,4'-bpy)_2 (H_2O)]_n (4,4'-bpy)_n(H_2O)_n (pic)-(2n) (2) and [Zn (4,4'-bpy)_2 (H_2O)]_n (4,4'-bpy)_n (pic)-(2n)(H_2O)_n (3) (4.4'-bpy = 4.4'-bipyridine. pic = picric anion ) have been synthesized and characterized by elemental analysis and single-crystal x-ray diffraction. They all have infinite three-dimensional network structure. crystallizing in the monoclinic space group C2/c (1) and Cc (2.3).

3-Dimensional Body Measurement Technology

3 - dimensional body measurement technology, the basis of developing high technology in industry, accelerates digital development of aplparel industry. This paper briefly introduces the history of 3 - dimensional body measurement technology, and recounts the principle and primary structure of some types of 3 - dimensional automatic body measurement system. With this understanding, it discusses prospect of 3- dimensional CAD and virtual technology used in apparel industry.

A modified maximum tangential tensile stress criterion for three-dimensional crack propagation

The three-dimensional （3D） crack propagation is a hot issue in rock mechanics. To properly simulate 3D crack propagation, a modified maximum tangential tensile stress criterion is proposed. In this modified criterion, it is supposed that cracks propagate only at crack front in the principal normal plane. The tangential tensile stress at crack front in the principal normal plane in local coordinates is employed to determine crack propagation, which is calculated through coordinate transformation from global to local coordinates. New cracks will propagate when the maximum tangential tensile stress at crack front in the principal normal plane reaches the tensile strength of rock-like materials. Compared with the previous crack propagation criteria, the modified crack propagation criterion is helpful in calculating 3D crack stress intensity factor, and can overcome the limitations of propagation step determined by individual experiences in previous studies. Finally, the 3D crack propagation process is traced by element-free Galerkin method. The numerical results agree well with the experimental ones for a frozen resin sample with prefabricated 3D cracks.

三维power-normal分布的性质及参数估计问题的研究

应用了Clayton连接函数的性质给出了三维power-normal分布的分布函数及概率密度函数,并详细研究了三维power-normal分布的基本性质,同时,根据所构造出的三维power-normal分布模型,对其中的参数进行了最大似然估计的讨论。并给出了参数的最大似然估计的算法。结合费永法在文献中的1964年到1973年10年间长江大通站、淮河中渡站及黄河花园口站的天然年流经量数据作为样本数据,利用MATLAB程序计算了参数的最大似然估计。

Parametric study on single shot peening by dimensional analysis method incorporated with finite element method

Shot peening is a widely used surface treatment method by generating compressive residual stress near the surface of metallic materials to increase fatigue life and re- sistance to corrosion fatigue, cracking, etc. Compressive re- sidual stress and dent profile are important factors to eval- uate the effectiveness of shot peening process. In this pa- per, the influence of dimensionless parameters on maximum compressive residual stress and maximum depth of the dent were investigated. Firstly, dimensionless relations of pro- cessing parameters that affect the maximum compressive residual stress and the maximum depth of the dent were de- duced by dimensional analysis method. Secondly, the in- fluence of each dimensionless parameter on dimensionless variables was investigated by the finite element method. Fur- thermore, related empirical formulas were given for each di- mensionless parameter based on the simulation results. Fi- nally, comparison was made and good agreement was found between the simulation results and the empirical formula, which shows that a useful approach is provided in this pa- per for analyzing the influence of each individual parameter.

基于GMM-Ada-LASSO模型的高维过程统计质量监控方法

针对高维数据往往不服从正态分布导致统计监控模型识别精度低、监控效率差的问题,文章提出一种基于高斯混合模型的变量选择控制图方法。首先,利用高斯混合模型将高维过程分解成若干个服从正态分布的子分布;然后,运用Adaptive LASSO算法识别潜在异常变量;最后,构建多元EWMA控制图实现高维过程统计质量监控。通过仿真实验,在六种不同情形下对所提方法的监控性能进行测试。结果表明,与传统MEW⁃MA和VS-MEWMA控制图相比,所提监控方法对非正态数据具有较强的稳健性,对高维过程具有良好的监控性能。

Test of Normality of Waist Measurement Data of Young Male and Female Adults based on the Quantile - Quantile Plot

This paper investigates the normality of some real data set obtained from waist measurements of a group of 49 young adults. The quantile - quantile （Q-Q） plot and the analysis of correlation coefficients for the Q-Q plot is used to determine the normality or otherwise of the data set. In this regards, the probabilities of the quantiles were computed, modified and plotted. Thereafter the correlation coefficients for the quantile - quantile plots were obtained. Results indicate that at 0.1 level of significance, the data for young adult males of the sample were not normally distributed, and had a mean value that is within the range of low risk, healthwise, whereas the distribution of the data for young female adults showed reasonable normality, but also with a mean value that is within the range of low risk in terms of health condition.

M.A. AND PH.D. DISSERTATIONS 1994-95 INSTITUTE FOR THE HISTORY OF ANCIENT CIVILIZATIONS NORTHEAST NORMAL UNIVERSITY, CHANGCHUN

Ma Xiaoying, Assyriology, Ph.D., 1994.12 "Women’s Social Status in Old Babylonia Reflected in Marital Property" (Supervisors: Professors Lin Zhichun, Thomas Lee, Tova Meltzer, Wu Yuhong) Wang Liying, Classics, Ph.D., 1995.6 "Sallust’s Bellum Catilinae" (Supervisors: Porfessors Wang Dunshu, P.Ruth Taylor-Briggs, F. Ahlheid, Lin Zhichun)

毛细管色谱切割-反吹法归一化分析汽油中芳烃

发展了一种毛细管色谱切割 反吹方法分析汽油中的芳烃。利用OV 2 3 3 0强极性毛细管预柱将芳烃保留至n C1 0 之后 ,并反吹到非极性毛细管柱中按沸点详细分离分析。从预柱先流出的组分和从分析柱流出的组分都先后进入同一检测器中 ,因此可用响应因子校正的归一化方法定量分析汽油中的芳烃。该方法在15min内完成汽油中苯至C1 0 芳烃的分析 ,结果的重复精度误差≤ 3 % (RSD) ,切割误差± 5s时对分析结果的影响≤ 4% (RSD)。

多维度质量检查模型在采供血机构COVID-19疫情防控常态化下的应用初探

目的在COVID-19疫情常态化防控期间,通过探索多维度结合的质量检查模型,监控采供血机构疫情防控的效果,以进一步加强传染病疫情防控、减少疫情防控期间站内感染,确保血液质量和血液安全。方法 COVID-19疫情防控期间,采用现场监测检查、视频监控、网络信息化等技术手段开展质量检查,对血站内的环境消毒、个人防护和血液产品质量等情况进行统计分析,对不同类型的质量检查模式进行分析比对。结果 2020年1月底-7月10日,开展疫情防控质量检查167 d共458点次,其中现场监测258点次、视频监测176点次、网络监测24次,发现不符合要求现象100例(21.8%)。对献血车、献血屋、单采成分献血室、成分制备室等共584个点位进行空气细菌检测,100%合格。对20位采血工作的手指和20位献血者进行穿刺部位进行细菌学检测,100%合格。抽检48袋单采血小板进行细菌学培养,均无细菌生长。抽检全血4袋和悬浮红细胞7袋、去白细胞悬浮红细胞21袋、新鲜冰冻血浆24袋、单采血小板48袋、辐照血液24袋、冷沉淀凝血因子24袋等血液成分,抽检结果均符合质量要求。结论通过多维度的质量检查,有效地实现了采供血业务质量检查全覆盖,同时也实现了中心所有非业务科室和公共场所疫情防控的全覆盖,确保了疫情防控期间质量检查符合要求,可以为采供血机构在COVID-19疫情常态化防控提供参考,对其他类型的传染病防控也有借鉴意义。

基于SVD-SRNet的SAR三维成像方法

合成孔径雷达(SAR)三维成像是传统二维SAR成像在雷达精细信息获取与感知领域的重要发展,可分辨重叠于二维SAR图像同一像素中的多个目标。稀疏信号处理是进行SAR三维成像的有效方法,但由于稀疏信号处理的非线性特征,常需迭代运算,效率较低。研究人员已提出利用深度学习技术实现快速解算非线性信号处理问题的思路,在三维成像领域已有初步应用。然而,由于SAR三维实测数据稀缺,三维成像网络的训练只能依赖于仿真数据进行,并且仿真数据与实测数据存在差异大的问题,导致基于深度学习方法的SAR三维成像精度受限。为此,本文提出了一种基于奇异值分解的信号空间归一化超分辨网络(SVD Signal-Space Normalization SuperResolution Net,SVD-SRNet),能够解决由于仿真数据与实测数据存在差异大导致的三维成像网络化方法鲁棒性低的问题,与传统方法相比所提方法具有更优异的成像精度。计算机仿真试验和无人机SAR实测数据试验证明了本文所提方法的有效性。

3D-CPA技术对正常妊娠不同孕周胎盘血流灌注的评价

目的:探讨应用三维彩色能量多普勒超声成像(three-dimensional color power angiographic,3D-CPA)技术定量评价正常妊娠不同孕周胎盘血流情况的价值。方法:选取100例正常孕妇,分为A组(孕周24+1～28周),B组(孕周28+1～32周),C组(孕周32+1～38周),对所有孕妇胎盘床血管进行三维重建,采用VOCAL软件测量VI、FI及VFI并观察其变化,并与孕龄(gestational age,GA)进行比较,计算它们之间的相关关系。结果:B组及C组较A组可显示较多的绒毛干血管。各组的VI、FI、VFI值分别为:A组4.01±1.50、31.5±2.88、1.67±0.62;B组5.94±0.91、34.7±3.21、2.09±0.77;C组6.23±2.11、36.9±4.78、2.35±0.90。3组VI、FI、VFI值的比较:B组及C组较A组均升高且差别有统计学意义(P<0.05)。B组较C组间差别均无统计学意义(P>0.05)。结论:3D-CPA技术使定量评估胎盘血流灌注成为可能,是观察孕妇的胎盘血流灌注变化的有效工具。

煤矿生产物流系统安全资源DMIP-MCDM评价法

为提升煤矿生产物流系统安全水平,运用多准则决策(MCDM)方法,建立基于动态多维交互投影(DMIP)的煤矿生产物流系统安全资源DMIP-MCDM评价法。首先,集成多个直觉正态模糊数(INFNs)动态聚合决策矩阵,并由此计算初始评价权重及均衡度评价权重;其次,依托直觉正态模糊广义混合变权Bonferroni(INFNGHVWB)算子计算精确度评价权重;再次,计算各级指标因素层的DMIP聚合评价权重及安全资源配置的最终总体评价权重;最后将DMIP-MCDM评价法应用于某矿生产物流系统中,进行实证分析。结果表明,安全资源配置的类别各异,同时交互影响;用DMIPMCDM能够实现安全资源配置状况的多维动态系统评价,有助于优化安全资源配置结构。

GM-BP串联组合预测模型在滑坡变形监测中的应用

为了提高滑坡的预测精度,通过对灰色GM(1,1)模型与BP神经网络模型各自优缺点及互补性的分析,建立了GM-BP串联组合预测模型。模型首先采用等维动态GM(1,1)模型进行初步预测,然后利用BP神经网络对初步预测的结果进行训练及仿真,通过数据的归一化处理,参数的判定选取,获得组合模型预测值。以茅坪滑坡为例,对位移进行了预测。通过数据的对比分析,发现GM-BP串联组合预测模型在短期预测精度上高于单一模型。

基于RGB-D树状结构物体三维重建

由于设备采集树状物体数据精度差,导致树状物体枝干连接部位数据丢失,重建出来的树状物体枝干不连续。树状结构物体颜色单调统一,各枝叶形状相似,导致特征点提取困难,配准精度低。通过对深度数据的分析,彩色图像与深度数据相比拥有更完整的信息,使用深度数据与彩色数据相结合的方法,根据彩色图像与深度数据的坐标映射关系,使用彩色图像修复缺失的深度数据。边界轮廓同样能够体现物体的形状特征,使用目标边界点作为特征点,应用边界点的曲率属性进行特征点的匹配。实验结果表明,使用彩色深度数据结合的优化方法相比较于直接用深度图优化深度数据的方法,能够解决枝干间断的问题,同时使边缘数据更加完整。使用边界特征配准方法能够为ICP精确配准提供良好的初始位置,从而提高精确配准时的精度。

π-旋转LDPC码译码算法及其量化研究

通过仿真分析论述了Normalized BP-Based算法对于π-旋转LDPC码具有很好的译码性能,并对此算法它进行了定点分析,从仿真结果可知,使用BPSK调制时,在白高斯噪声信道下,Normalized BP-Based译码算法使用正确的量化方案时可以获得和浮点几乎一致的性能。