有限域Fq上矩阵的广义逆及矩阵Kronecker积

给出了Fq上矩阵群逆和E-P逆和E-P逆及矩阵Kronecker积的弱广义Schur补定义,并讨论了其相应的特殊性质.     

On best affine prediction

The theory of best affine prediction (BAP) is extended to the vector case with possibly singular variance matrix of the predictor variable. The theory is then applied to derive Thomson’s classical predictor for factor scores, allowing for a singular variance matrix of the factors. The results are formulated in a free distribution setting. Further, Bartlett’s estimator is considered and compared with Thomson’s predictor. The authors are thankful to the two referees, one for a suggestion that led to the Addendum of the paper, and the other one for several very useful remarks. Research supported by the Spanish grant BEC2000-0983.     

论超限运输及其对策

文章详细论述超限运输的危害 ,从各种角度分析超限行为出现和蔓延的原因 ,在此基础上 ,从系统高度来思考遏制超限运输现象的对策 ,对从根本上解决超限运输问题有一定的启发和指导作用。     

未成年人思想道德教育的几点思考

紧紧抓住学校主要阵地,充分发挥教师主导力量,依靠学生主体地位是增强未成年人思想道德教育的主动性、针对性、实效性的根本。     

论人类困境与中国儒学的和谐思想

在过去的数百年间 ,世界现代化取得了巨大成功 ,但进入后现代时期以来 ,人们开始发现欧洲范式的现代化存在极大的负面效应。面对种种严峻的现实问题 ,中国儒学的哲学思维再次成为人们关注的目标 ,它强调人类社会与自然的普遍和谐 ,重视整体思维。在当今多元文化并存的时代 ,中国儒学将进一步整合 ,为人类发展和文化进步做出新的贡献 ,促进和实现人类社会的可持续发展。     

A theory of statistical models for Monte Carlo integration

Summary. The task of estimating an integral by Monte Carlo methods is formulated as a statistical model using simulated observations as data. The difficulty in this exercise is that we ordinarily have at our disposal all of the information required to compute integrals exactly by calculus or numerical integration, but we choose to ignore some of the information for simplicity or computational feasibility. Our proposal is to use a semiparametric statistical model that makes explicit what information is ignored and what information is retained. The parameter space in this model is a set of measures on the sample space, which is ordinarily an infinite dimensional object. None-the-less, from simulated data the base-line measure can be estimated by maximum likelihood, and the required integrals computed by a simple formula previously derived by Vardi and by Lindsay in a closely related model for biased sampling. The same formula was also suggested by Geyer and by Meng and Wong using entirely different arguments. By contrast with Geyer's retrospective likelihood, a correct estimate of simulation error is available directly from the Fisher information. The principal advantage of the semiparametric model is that variance reduction techniques are associated with submodels in which the maximum likelihood estimator in the submodel may have substantially smaller variance than the traditional estimator. The method is applicable to Markov chain and more general Monte Carlo sampling schemes with multiple samplers.     

一类具有反馈控制HollingⅡ类功能反应模型的研究

讨论了一类具有反馈控制Holling Ⅱ类功能反应的二维捕食系统持续生存的条件．给出了当系统为周期系统时，其周期解存在惟一和全局吸引的条件．     

企业文化在企业管理中的地位与作用

企业文化伴随管理实践的发展应运而生,是以对人的管理为中心,以培育企业信念、企业价值观为核心内容,以全体员工的认同为基础,以塑造企业形象为基本手段,以增强企业竞争力为目的的新型管理理论。尽管企业文化与战略管理、营销管理、人力资源管理等硬性管理不同,但它以管理思想、管理灵魂的价值定向、导向功能在企业管理中起着统摄作用,以企业生命基因的地位决定着企业的发展趋势。     

Broer-Kaup方程组的新类孤子解

本文通过适当变换,将Broer-Kaup方程组变为一个简单的方程,然后利用比较广泛的假设,用Riccati方程的解来构造该方程的解,得到了Broer-Kaup方程组的新类孤子解。     

毛泽东和平解决台湾问题战略成果透析

关于毛泽东和平解决台湾问题战略实践的成果,传统认识是:中共在提出“和平解放台湾”方针后,便加紧了对台争取工作,只因蒋介石顽固坚持反共立场,和平统一祖国的事业并未取得任何实质性进展。显然,此判断有失偏颇。毛泽东和平解决台湾问题长达20余年的战略实践,为后来者揭开了和平统一的崭新一页,作了根本性的铺垫;当是后来邓小平“和平统一、一国两制”方略形成的历史根基与历史前提。