一种局部频域分析的多尺度纹理特征提取方法

在局部二进制模型和多分辨率分析的基础上,提出一种基于局部频域分析的多尺度纹理特征提取方法。对纹理图像采用局部圆形邻域作为局部模板进行局部频率变换,对各频段图像实现多分辨率分析,提取多尺度下的特征向量,结合SVM算法进行分类实验。结果证明,该方法在继承了LBP对光照因素具有的稳定性的同时,具有旋转不变性特征;利用NSCT在多尺度下进行的纹理特征提取也满足尺度不变性的需要,与其他方法相比提高了分类准确率。     

“4321”项目化教学设计在建筑工程计量与计价课程中的应用

以建筑工程技术专业建筑工程计量与计价课程为例,从建设项目建设程序和建设主体入手,对建筑工程计量与计价课程相关的岗位进行分析,得出典型工作流程;再以项目为依托,对课程内容进行选择、重构、序化,提出了“4321”教学过程设计,实现了建筑工程计量与计价课程理实一体的项目化教学目标。     

仅发送者知道通道信息的可控概率隐形传态

采用推广测量法,在仅发送者Alice知道部分纠缠GHZ态通道信息的条件下,提出了实现可控概率隐形传态的方案。     

水下航行体舵角自动测量装置概述

本文介绍了在航行体的自动检测中舵角的自动测量装置,对自动测量的原理和电路进行了详细说明。     

品格证据与量刑的相关性探讨

品格证据是英美法系中证据规则颇令人费解的难题之一,英美证据立法确立了品格证据不具有相关性的一般规则,但在特殊情况下又对其加以保留。在我国,品格证据这一名词尚未进入法条,但司法实践中却偶有涉及。但无论是中国法系,还是英美法系,都将其纳入量刑考虑的因素。品格证据在量刑中始终大有作为。     

Measurement Bias Detection Through Factor Analysis

Assessing the correctness of a structural equation model is essential to avoid drawing incorrect conclusions from empirical research. In the past, the chi-square test was recommended for assessing the correctness of the model but this test has been criticized because of its sensitivity to sample size. As a reaction, an abundance of fit indexes have been developed. The result of these developments is that structural equation modeling packages are now producing a large list of fit measures. One would think that this progression has led to a clear understanding of evaluating models with respect to model misspecifications. In this article we question the validity of approaches for model evaluation based on overall goodness-of-fit indexes. The argument against such usage is that they do not provide an adequate indication of the “size” of the model's misspecification. That is, they vary dramatically with the values of incidental parameters that are unrelated with the misspecification in the model. This is illustrated using simple but fundamental models. As an alternative method of model evaluation, we suggest using the expected parameter change in combination with the modification index (MI) and the power of the MI test.     

General Growth Mixture Analysis of Adolescents' Developmental Trajectories of Anxiety: The Impact of Untested Invariance Assumptions on Substantive Interpretations

Substantively, this study investigates potential heterogeneity in the developmental trajectories of anxiety in adolescence. Methodologically, this study demonstrates the usefulness of general growth mixture analysis (GGMA) in addressing these issues and illustrates the impact of untested invariance assumptions on substantive interpretations. This study relied on data from the Montreal Adolescent Depression Development Project (MADDP), a 4-year follow-up of more than 1,000 adolescents who completed the Beck Anxiety Inventory each year. GGMA models relying on different invariance assumptions were empirically compared. Each of these models converged on a 5-class solution, but yielded different substantive results. The model with class-varying variance–covariance matrices was retained as providing a better fit to the data. These results showed that although elevated levels of anxiety might fluctuate over time, they clearly do not represent a transient phenomenon. This model was then validated in relation to multiple predictors (mostly related to school violence) and outcomes (grade-point average, school dropout, depression, loneliness, and drug-related problems).     

Testing Measurement Invariance Across Groups in Longitudinal Data: Multigroup Second-Order Latent Growth Model

In latent growth modeling, measurement invariance across groups has received little attention. Considering that a group difference is commonly of interest in social science, a Monte Carlo study explored the performance of multigroup second-order latent growth modeling (MSLGM) in testing measurement invariance. True positive and false positive rates in detecting noninvariance across groups in addition to bias estimates of major MSLGM parameters were investigated. Simulation results support the suitability of MSLGM for measurement invariance testing when either forward or iterative likelihood ratio procedure is applied.     

利用声卡进行水中声速测量

设计了一个基于计算机声卡进行水中声速测量的实验,该实验可以作为设计性和探究性实验应用到高中物理教学当中。     

超声及其应用

叙述超声的物理基础和应用,其主要内容是:超声工程材料,超声换能,超声检测,声表面波、声体波与声光器件,医学超声,水声技术,超声测量与标准化.