多媒体技术在语文教学中的作用之我见

在中学语文教学中 ,多媒体技术表现出很大的优势 ,同时它的误区也越来越被广大教师所关注 ,只有充分认识到多媒体在语文教学中的辅助教学地位 ,才能真正发挥它的作用     

法治与德治的时代底蕴与逻辑基础

法治与德治的紧密结合,不仅是治国方略的进一步成熟,而且也是中国共产党在执政方式上的历史选择.在社会主义建设的新时期,法治与德治的内涵带有鲜明的时代特征.虽说法治与德治是两种不同的治理方式,但二者应该存在着相互契合的时代底蕴,而且它们都遵循着共同的逻辑基础.     

我国风险资本市场发展制约因素分析

风险资本市场是资本市场中一种创新的市场形态,它的运作有其内在的特殊规律性,其产生和发展需要与之相适应的环境。本文从八个方面详细分析了制约我国风险资本市场的制约因素。     

生源竞争与高校招生宣传工作原则及策略研究

社会对高等教育期望值的提高、高等教育格局的悄然改变、高等教育规模的稳步扩大，必然会引起激烈的生源竞争。生源质量直接关系着学校的生存、前途和命运。加强招生宣传工作已为许多高校所重视。只有遵循若干原则和规则，合理运用各种策略，招生宣传工作才能有序有效。     

殖民运动对古希腊国际法影响之初探

公元前8—公元前6世纪,古希腊各城邦因各种原因广泛开展了殖民运动,希腊人的殖民地遍及地中海、黑海沿岸。殖民运动对古希腊国际公法的影响广泛而深刻,对其国际经济法与国际私法的萌芽与发展,也起了极大的推动作用。     

Estimation in noncentral distributions

This paper investigates alternatives to MIU estimators in noncentral X ² and F distributions. Two directions are pursued. In the first, a general approach for uniformly improving on MVU estimators is described and illustrated. In the second, Bayesian, procedures are characterized and illustrated as well. This effort extends earlier work of Perlman and Rasmussen and of Neff and Strawderman.     

A new procedure for testing equivalence in comparative bioavailability and other clinical trials

The problem of testing for equivalence in clinical trials is restated here in terms of the proper clinical hypotheses and a simple classical frequentist significance test based on the central t distribution is derived. This method is then shown to be more powerful than the methods based on usual (shortest) and symmetric confidence intervals.

We begin by considering a noncentral t statistic and then consider three approximations to it. A simulation is used to compare actual test sizes to the nominal values in crossover and completely randomized designs. A central t approximation was the best. The power calculation is then shown to be based on a central t distribution, and a method is developed for obtaining the sample size required to obtain a specified power. For the approximations, a simulation compares actual powers to those obtained for the t distribution and confirms that the theoretical results are close to the actual powers.     

A Note on the Noncentral Beta Distribution Function

The noncentral beta and the related noncentral F distributions have received much attention during the last decade, as is evident from the works of Norton, Lenth, Frick, Lee, Posten, Chattamvelli, and Chattamvelli and Shanmugam. This article reviews the existing algorithms for computing the cumulative distribution function (cdf) of a noncentral beta random variable, and proposes a simple algorithm, based on a sharp error bound, for computing the cdf. A variation of the noncentral beta random variable when the noncentrality is associated only with the denominator χ² and its computational details are also discussed.     

Sampling Methods for Wallenius' and Fisher's Noncentral Hypergeometric Distributions

Several methods for generating variates with univariate and multivariate Walleniu' and Fisher's noncentral hypergeometric distributions are developed. Methods for the univariate distributions include: simulation of urn experiments, inversion by binary search, inversion by chop-down search from the mode, ratio-of-uniforms rejection method, and rejection by sampling in the τ domain. Methods for the multivariate distributions include: simulation of urn experiments, conditional method, Gibbs sampling, and Metropolis-Hastings sampling. These methods are useful for Monte Carlo simulation of models of biased sampling and models of evolution and for calculating moments and quantiles of the distributions.