关于强正则环的几个等价刻划     

方茵  雷震 《洛阳师范学院学报》2004,23(2):20-21

设R是一个环 ,如果对于任意的x ,y∈R ,有xy -yx∈C(R) ,那么下列条件等价 :( 1 )R是强正则环 ;( 2 )R是VonNeumann正则环 ;( 3)R是广义正则环 .设R是半可换环 ,则以下条件等价 :( 1 )R是强正则环 ;( 2 )R的每一个极大的本质的左理想是左GP -内射模 ;( 3)R的每一个极大的本质的右理想是右GP -内射模 .  相似文献   

关于A~ 的求法     

张英 《雁北师范学院学报》1996,(6)

本文分几种情况讨论A~ 的计算法。  相似文献   

Exact Computation of Parallel Robot''''s Generalized Inertia Matrix     

赵永杰  杨志永  梅江平  黄田 《天津大学学报(英文版)》2005,11(6)

According to the definition of the new hypothetical states which have obvious physical sig-nificance and are termed as no-gravity static and accelerated states, a method for exact computa-tion of the parallel robot's generalized inertia matrix is presented. Based on the matrix theory, the generalized inertia matrix of the parallel robot can be computed on the assumption that the robot is in these new hypothetical states respectively. The approach is demonstrated by the Delta robot as an example. Based on the principle of the virtual work, the inverse dynamics model of the robot is formulized after the kinematics analysis. Finally, a numerical example is given and the element dis-tribution of the Delta robot's inertia matrix in the workspace is studied. The method has computational advantage of numerical accuracy for the Delta robot and can be parallelized easily.  相似文献   

Bayesian Regularized Multivariate Generalized Latent Variable Models     

Xiang-Nan Feng  Xin-Yuan Song 《Structural equation modeling》2017,24(3):341-358

We consider a multivariate generalized latent variable model to investigate the effects of observable and latent explanatory variables on multiple responses of interest. Various types of correlated responses, such as continuous, count, ordinal, and nominal variables, are considered in the regression. A generalized confirmatory factor analysis model that is capable of managing mixed-type data is proposed to characterize latent variables via correlated observed indicators. In addressing the complicated structure of the proposed model, we introduce continuous underlying measurements to provide a unified model framework for mixed-type data. We develop a multivariate version of the Bayesian adaptive least absolute shrinkage and selection operator procedure, which is implemented with a Markov chain Monte Carlo (MCMC) algorithm in a full Bayesian context, to simultaneously conduct estimation and model selection. The empirical performance of the proposed methodology is demonstrated through a simulation study. An application of the proposed method to a study of adolescent substance abuse based on the National Longitudinal Survey of Youth is presented.  相似文献   

服务台由N个部件串联的M/G/1(E,MV)可修排队系统的平稳分布     

魏瑛源 《河西学院学报》2006,22(2):6-10

文章考虑到服务台是由N个不同型部件串联组成的M/G/1(E,MV)可修排队系统,其中服务台工作当且仅当N个部件都工作.假定每个部件的寿命服从指数分布,故障部件的修理时间服从一般分布.通过引入顾客的“广义服务时间”和队长过程的嵌入Markov链,得到了嵌入Markov链的平稳分布的递推表达式以及平均队长.  相似文献   

体育教学交往活动的现实意义     

林振环 《张家口职业技术学院学报》2002,15(4):36-38

重视体育教学活动交往性的特点，有利于促进体育教学育人功能的正常发挥，有利于体育教学中打破知识授受的单一模式。有意识地加强师生间、学生间的交往，可以促进学生的良好发展。  相似文献   

Models for Semiordered Data to Address Not Applicable Responses in Scale Measurement     

Anne Corinne Huggins-Manley  James Algina  Sherry Zhou 《Structural equation modeling》2018,25(2):230-243

The purpose of this study is to develop and evaluate unidimensional models that can handle semiordered data within scale items (i.e., items with multiple ordered response categories, and one additional nominal response category). We apply the models to scale data with not applicable (NA) responses to compare the model performance to conditions in which NA responses are treated as missing and ignored. We also conduct a small simulation study based on the operational study to evaluate the parameter recovery of the models under the operational conditions. Findings indicate that the proposed models show promise for (a) reducing standard errors of trait estimates for persons who select NA responses, (b) reducing nonresponse bias in trait estimates for persons who select NA responses, and (c) providing substantive information to practitioners about the nature of the relationship between NA selection and the trait of measurement.  相似文献   

从语义学角度谈词汇教学     

陈永庆 《沈阳教育学院学报》2006,8(2):67-69

本文从词源学与词义角度分析英语词汇的构成与意义，以期帮助学习者找到记忆词汇的好办法。在词源方面，以例透析了英语词汇大部分来自于法语、德语与拉丁语等，应了解某些词缀的含义，这样在认识与记忆词汇方面便可以以组群为单位，联想记忆；在词汇的意义方面，试析了英语词汇的概念意义与关联意义，探讨了用词时一定要考虑情境，做到语言得体。  相似文献   

一类非线性Φ-强伪压缩映射Mann迭代序列的收敛性     

汪志明  刘凤池  张健  吴焕春 《唐山学院学报》2007,20(4):101-102,116

在q一致光滑Banach空间中,研究了一类广义LipschitzΦ-强伪压缩映射和Φ-强增生映射的Mann迭代收敛问题,所得结果改进和扩展了目前的相关结果。  相似文献   

向量最优化问题的最优性条件     

袁德辉 《韩山师范学院学报》2005,26(3):13-16

定义了几种集值映射的广义凸性，研究了相应的性质刻画及其Gordan—Farkas型定理，并利用此Gordan—Farkas型定理给出了集值映射向量最优化的最优性条件．  相似文献