信息调整公路将对教与学产生重大影响

本文论述了历史上传播媒体所经历的三次重大变革,以及在各个时期对教育产生的重要影响,并重点阐述了信息高速公路的出现和发展正以惊人的速度改变着人们的交往方式、学习方式、工作方式和生活方式.在教学领域,信息高速公路正在挑战传统的媒体,并将越来越多地发挥出它的强大优势,改变着我们传统教育的教学内容、教学方式、教育结构以及整个教育体系.     

信息化对我国现代化建设进程的路径启示

信息技术革命作为人类进入工业文明以后的第三次技术革命 ,信息化作为当今世界经济科技发展的一个大趋势 ,事实上在经济科技乃至社会生活各个领域都强有力地支持着人类的现代化历史进程 ,正日益成为当今世界经济发展的新的基础性推动力量。对于中国 ,国民经济信息化的意义远不仅仅是对于经济结构战略性调整的促进与推动 ,更为主要的是它正改变着我国现代化建设特别是现代化建设第三步战略目标的进程 ,从而将构画出中国现代化进程的新轨迹、新路径。     

我国二板市场的信息风险及监管模式研究

本文通过分析二板市场信息不完全、不对称现象导致的市场风险 ,以及信息风险产生的原因 ,从降低信息收集和处理成本、提高信息生产和流通效率的角度 ,提出建立一个自律与他律相契合的三级链式二板市场监管体系 ,并分别分析了中国证监会、证券业协会、做市商、保荐人、独立董事在监管体系中的信息创造和信息传导机制 ,揭示了其在降低交易成本方面的作用。     

Statistical analysis of a two-unit dependent repairable system

Maximum likelihood estimators are investigated a for lr-out-of 2:G repairable system when failures and repairs are statistically dependent. Under two censoring schemes Accelerated Life Testing Procedure (ALTP) is used to obtain the estimates. Information matrices are supplied and a special case when the failure and repair phenomenon are independent of each other is considered.     

Some improved ratio type estimators of population mean and ratio in finite population sample surveys

In this paper we present a class of ratio type estimators of the population mean and ratio in a finite population sample surveys with without replacement simple random sampling design, where information on an auxiliary variate x positively correlated with the main variate y is available. Large sample approximations to mean square errors (MSE) of these estimatorsare evaluated and their MSE's are compared with the MSE of the usual ratio estimator [ybar]_R of [ybar] the population mean of y. It is shown that under certain conditions these estimators are more efficient than [ybar]_R. When a prior knowledge of the value of thecoefficient of variation, c_y, of y is at hand, ratio type estimator, say [ybar]₁ of [ybar] is proposed. It is shown, under certain conditions, that [ybar]₁ is more efficient than [ybar]_R. When values of c_y, c_x and the population correlation coefficient ρ is at hand, then we have proposed another estimator, say [ybar]₂ of [ybar], which is always better than [ybar]_R as far as the efficiency is concerned. In fact, is [ybar] ₂ is shown to be even better than [ybar]₁. Finally estimators better than the usual ratio estimator [ybar]/[xbar] of [Ybar] are given.     

Anova and minque type of estimators for the one-way random effects model

The one-way random effects model with unequal variances and unequal sample sizes is considered. Estimation of the variances, variance of a single observation (total variance), and the standard error of the unweighted mean are considered. Precision of the Analysis of Variance and Unweighted Sums of Squares type of estimators and the Minimum Norm Quadratic Unbiased Estimators with a priori weights are examined.     

金融科技、财务风险与公司治理

以沪深A股上市企业2011—2020年数据为研究样本，运用固定效应模型，研究金融科技与公司治理水平的关系以及财务风险在其中的中介作用。结果表明：金融科技能够显著提高公司治理水平，企业财务风险在两者之间发挥部分中介作用；金融科技对会计信息披露质量优秀企业的治理水平影响最大，对会计信息披露质量不合格企业的治理水平没有显著影响；相对于内部控制存在缺陷的企业，金融科技对内部控制不存在缺陷的企业促进作用更大。为此，政府应对金融科技企业给予足够的政策支持，完善金融监管体系；企业应加大运用金融科技的力度，提高会计信息披露质量，减少企业内部控制缺陷，降低企业财务风险，以提高公司治理水平，促进企业高质量发展。     

移动网非忙时资源再利用的经济分析

随着3G网络在全国范围内大规模的开展,移动通信网在带宽和覆盖上都有了大幅度的提高,网络在满足忙时业务量需求的同时,又造成了非忙时资源的闲置。本文在对移动运营商收入和成本的分析中引入了时间的参量;通过实际数据分析了忙时和非忙时的业务差异和资源占用差异;对移动运营商分时定价进行了可行性分析,从需求和供给层分析了可能产生的影响。分析结果表明,移动运营商主动降低非忙时段的价格,能吸引SP/CP开发出更多的业务以及用户加大在非忙时段消费,使运营商、SP/CP和消费者在使用量增加的基础上实现共赢。     

Smoothing for discrete-valued time series

We deal with smoothed estimators for conditional probability functions of discrete-valued time series { Y_t } under two different settings. When the conditional distribution of Y_t given its lagged values falls in a parametric family and depends on exogenous random variables, a smoothed maximum (partial) likelihood estimator for the unknown parameter is proposed. While there is no prior information on the distribution, various nonparametric estimation methods have been compared and the adjusted Nadaraya–Watson estimator stands out as it shares the advantages of both Nadaraya–Watson and local linear regression estimators. The asymptotic normality of the estimators proposed has been established in the manner of sparse asymptotics, which shows that the smoothed methods proposed outperform their conventional, unsmoothed, parametric counterparts under very mild conditions. Simulation results lend further support to this assertion. Finally, the new method is illustrated via a real data set concerning the relationship between the number of daily hospital admissions and the levels of pollutants in Hong Kong in 1994–1995. An ad hoc model selection procedure based on a local Akaike information criterion is proposed to select the significant pollutant indices.     

一种政务网信息交换与共享新模型

针对电子政务建设过程中出现的政务信息交换模型进行分析，在此基础上，提出新的政务信息交换C D模型有机地整合了集中式、分布式和目录服务模型所具备的优势，并结合政务网络的特点，利用复杂网络理论对C D模型的有效性进行了论证。该模型中的目录信息临接交换技术能够有力地提高各政务部门之间信息交换与共享的效率和可靠性。