医院图书馆在开展循证医学中的应对方略

简述了循证医学的概念、国内发展现状及其对医院图书馆的要求，进而提出了医院图书馆在开展循证医学过程中的应对方略。     

一种改进的基于子空间估计的检测器

针对现阶段广泛应用信号子空间跟踪算法PAST算法在低信噪比和强多址干扰情况下,估计出信号子空间有较大的误差而提出一种新的信号子空间概念。通过理论分析和仿真,验证了新的算法能够克服PAST算法的缺点。并在此基础上构成的一种新的MMSE检测器,该检测器具有良好的误码率和抗“远-近”能力,结构简单,计算复杂度低,而且对信号子空间维数大小估计错误时并不敏感。     

基于CMM/CMMI的DP过程实施方法及其WEB实现

CMM/CMMI的关注点在于过程改进,即通过改进过程来改进产品。但CMM/CMMI只描述了一个成熟组织应具有的软件过程能力,却没有指出如何取得这种能力的具体方法。由于没有过程能力的具体实施方法及缺乏支持工具,一些通过CMM/CMMI的企业的过程能力并未达到预期效果。针对这一问题,对如何实现CMM/CMMI中原因分析与解决方案过程域的主要目标进行了深入分析,提出一种简洁、易实施并具有一定通用性的缺陷预防(Defect Prevention,DP)实施方法,并介绍了基于该方法的DP过程支持工具的WEB实现。     

The tyranny of setting (ability grouping): Challenges to inclusion in Scottish primary schools

Debate around the use of ability grouping in schools, resonates across national boundaries as concerns rise around the possible negative impact on young people, particularly those in already disadvantaged groups. In this paper, a survey focussing on primary schools in Scotland established the extent to which some form of ability grouping has emerged within classes dealing with children from 5 to 12 years of age, the rationale behind the decisions made and the issues and challenges faced by schools.     

Addressing cross-national generalizability in educational impact evaluation

Evaluation of educational programs has accelerated dramatically in the past quarter century. With this expansion has come clear methodological improvement involving randomized control studies and other approaches for establishing causation that considerably strengthen their internal validity. Such studies are, however, conducted within individual countries with the institutional structure of the schools and the national labor markets, and they are seldom replicated either within or across countries. A natural question is whether the results of an individual high-quality educational evaluation in one country can be reasonably applied in other countries. This paper focuses on existing research into differences across countries that, while generally impossible to incorporate into program evaluations, potentially have direct effects on key elements of policy and on the outcomes that can be expected. In particular, available cross-national studies on a variety of topics suggest using caution when generalizing evaluation results across countries, because student results are likely to vary systematically with a number of fundamental country-level institutional characteristics that are not explicitly considered in within-country evaluation analyses. Unfortunately, there is currently too little replication of basic research studies to provide explicit guidance on when and where cross-national generalizations are possible.     

A new method for fault prediction of model-unknown nonlinear system

In this paper, the subspace identification based robust fault prediction method which combines optimal track control with adaptive neural network compensation is presented for prediction the fault of unknown nonlinear system. At first, the local approximate linear model based on input-output of unknown system is obtained by subspace identification. The optimal track control is adopted for the approximate model with some unknown uncertainties and external disturbances. An adaptive RBF neural network is added to the track control in order to guarantee the robust tracking ability of the observation system. The effect of the system nonlinearity and the error caused by subspace modeling can be overcome by adaptive tuning of the weights of the RBF neural network online without any requisition of constraint or matching conditions. The stability of the designed closed-loop system is thus proved. A density function estimation method based on state forecasting is then used to judge the fault. The proposed method is applied to fault prediction of model-unknown fighter F-8II of China airforce and the simulation results show that the proposed method can not only predict the fault, but has strong robustness against uncertainties and external disturbances.     

基于区域协方差矩阵的模板更新方法分析与比较

在目标跟踪算法中,目标特征描述子和模板更新策略都是跟踪成败的关键。本文在选用区域协方差矩阵描述子的基础上,结合粒子滤波器算法,并且采用两种常用的模板更新方法,分别对商场通道监控视频序列中的行人进行了跟踪仿真实验。通过仿真分析并比较不同模板更新方法条件下的跟踪性能,从而在不同情况下选择合适的模板更新方法,以得到更精确的跟踪结果。     

Tracking and inequality: The results from Turkey

This qualitative study aims to analyse the effects of the practice of tracking as the means of placing students in secondary schools on educational inequality in Turkey in light of a set of qualitative data collected through in-depth interviews. Findings indicate that the tracking of all students into different high schools based on their scores on the national high school entrance examination since 2014 poses new obstacles for the academic success of low-achieving poor children due to various unintended consequences posed by the school environments. The study has implications for other educational systems that track students based on exam scores.     

金蝶k/3采购管理系统在中小企业中的实现和应用价值

采用金蝶k/3采购管理系统,可帮助中小企业实现采购的全程跟踪,采购订单管理,采购价格管理,有效地提升中小企业的采购效率,控制采购成本,满足采购及时地供应生产的需求。     

基于ARM9和FPGA的GPS接收机软硬件设计与实现

论述了GPS卫星接收机信号生成原理及其方法,针对GPS卫星信号特点设计制作相应硬件平台和设计信号的捕获、跟踪、同步等信号控制处理策略和实现方法,分析了GPS信号处理流程,提出了卫星接收机的硬件平台选择方法,研究了GPS接收机在此硬件平台的实现方法,最后在Quartus II9.1和ADS1.2下完成了对GPS卫星的数据接收和处理仿真,并在ARM+FPGA硬件平台上进行实现。