基于终端准入机制的网络资源管理平台技术研究

本文主要介绍了基于终端准入机制的网络资源管理平台的研究目标、平台架构、设计原则、主要功能以及技术特点。     

高职高专图书馆开架阅览管理与服务

近几年,高职院校为了与社会发展同步,图书馆开架阅览已经成为图书馆管理的主要模式。笔者结合多年图书管理经验,从高职高专图书馆开架阅览的利弊以及必要性着手,对加强高职高专图书馆开架阅览管理与服务的措施做了简单介绍。     

Incentives and teacher effort

Few would contest that teachers are a very important determinant of how much students learn in school, and how to improve teacher performance has been the focus of lively policy debate in both rich and poor countries. This paper examines how teacher incentives, both pecuniary and non‐pecuniary, correlate with teacher effort. Using school survey data from Lao PDR, we estimate measures of teacher effort, including the number of hours that teachers spend preparing for classes and teacher provision of private tutoring outside of class hours, which are not the typical measures used in previous research. Estimation results fit well under the standard labour supply framework and indicate that greater teacher effort is associated with non‐pecuniary incentives such as more teacher autonomy over teaching materials and monitoring as measured by the existence of an active parent – teacher association and the ability of school principals to dismiss teachers. Methodologically, this paper provides a detailed derivation of a simultaneous OLS‐probit model with school random effects that can jointly estimate teacher work hours and tutoring provision.     

RFID技术在铁路集装箱堆场进出口的应用

利用射频识别技术（RFID）可以实现集装箱箱号及其属性的自动识别,大大提高铁路集装箱运输作业的自动化水平。论文首先分析了目前铁路集装箱运输作业中存在的主要问题及RFID在集装箱运输中的应用现状,提出了铁路集装箱办理站出入口自动管理系统的功能设计并详细规划了在集卡出入口和铁路出入口的应用方案。该方案可改变原有落后低效的工作方式,有效加快集装箱进出堆场的速度,提高管理的自动化水平,实现自动出入管理。     

Sociological Models Based on Fréchet Random Variables

Products of random variables are of both practical and theoretical significance to social scientists. This has increased the need to have available the widest possible range of statistical results on products of random variables. In this note, the distribution of the product XY is derived when X and Y are independent Fréchet random variables. Extensive tabulations of the associated percentage points are also given.     

我国居家养老社区服务均等化分析框架与实证探索——基于北京、南京、咸阳三市的调查

在推进基本养老服务均等化过程中,如何科学度量、分析均等化始终是学界关注的一个热门议题。在对均等化概念、衡量标准和分析框架进行阐释的基础上,明确提出居家养老社区服务均等化的概念认知和评判标准。同时,借鉴“居家养老社区服务可及性分析框架”构建了“居家养老社区服务均等化的分析框架”。基于北京、南京和咸阳三地实地调研数据,运用方差分析（ANOVA）方法对居家养老社区服务均等化进行评估分析。结果显示：整体来看,居家养老社区服务在地区之间、城乡之间均存在“不均等”现象;分阶段来看,居家养老社区服务在地区之间、城乡之间存在“起点不均等”、“过程不均等”现象,城乡之间已基本实现了“结果均等”。之后,进一步从公共财政投入差异,地区之间进入老龄化社会的时间、严重程度以及社会力量参与度等方面分析探讨居家养老社区服务“不均等”的内在原因并提出对策建议。研究成果对实现居家养老社区服务均等化具有重要的指导作用。     

Bartlett correction to the likelihood ratio test for MCAR with two‐step monotone sample

Assuming that two‐step monotone missing data is drawn from a multivariate normal population, this paper derives the Bartlett‐type correction to the likelihood ratio test for missing completely at random (MCAR), which plays an important role in the statistical analysis of incomplete datasets. The advantages of our approach are confirmed in Monte Carlo simulations. Our correction drastically improved the accuracy of the type I error in Little's (1988, Journal of the American Statistical Association, 83 , 1198–1202) test for MCAR and performed well even on moderate sample sizes.     

Conditional assessment of the impact of a Hausman pretest on confidence intervals

In the analysis of clustered and longitudinal data, which includes a covariate that varies both between and within clusters, a Hausman pretest is commonly used to decide whether subsequent inference is made using the linear random intercept model or the fixed effects model. We assess the effect of this pretest on the coverage probability and expected length of a confidence interval for the slope, conditional on the observed values of the covariate. This assessment has the advantages that it (i) relates to the values of this covariate at hand, (ii) is valid irrespective of how this covariate is generated, (iii) uses exact finite sample results, and (iv) results in an assessment that is determined by the values of this covariate and only two unknown parameters. For two real data sets, our conditional analysis shows that the confidence interval constructed after a Hausman pretest should not be used.     

Market access by smallholder farmers in Malawi: implications for technology adoption,agricultural productivity and crop income

In Malawi, maize is the major crop and food staple. Given limited off-farm employment opportunities, much-needed increases in household income for improving food security must come from gains in agricultural productivity through better technology and more profitable crops. In the past, hybrid maize and more recently, tobacco were promoted by policy for increasing smallholder income. An analysis of determinants of adoption of these two crops and related income effects is presented. Apart from factor endowment and exposure to agroecological risks, differences in the household's access to financial and commodity markets significantly influence its cropping shares and farm income.