Networks of Encouragement: Who’s Encouraging Latina/o Students and White Students to Enroll in Honors and Advanced-Placement (AP) Courses?

Using affiliation network data collected at a large high school, this study examined differences between who encourages Latina/o and White students to enroll in advanced courses. Previous research has shown a positive association between emotional support and academic achievement, and thus, this study shifts the focus from who informs students to who encourages them. This study revealed that on average, Latina/o and White students have different networks of encouragement.     

Invest for the Long Term or Attend to Immediate Needs? Schools and the Employment of Less Educated Youths and Adults

For the past 20 years, researchers worldwide have shared a consensus that tracking leads to failure in school. But educational systems continue to use this practice for many reasons. One argument used to support the practice is that students who enter the vocational track early in their careers tend to enter the labour market more quickly. Data show, however, that when these people are in their 40s, they become the most vulnerable to poverty, especially during periods of economic recession. In addition to moving towards more comprehensive educational systems as the best long-term way to improve the chances of all future adults, our research demonstrates that schools can play a key role in preventing and reversing the risk of unemployment and poverty of low educated youth. The INCLUD-ED project has analysed effective actions in eight European countries (Slovenia, United Kingdom, Italy, Austria, Romania, Belgium, Finland, and Spain) that respond to the educational needs of those who have experienced tracking. These effective alternatives are vocational programmes that include an academic-type of curriculum and allow students to move to higher education, as well as adult education programmes in schools which meet families' training needs, improving their opportunities in the labour market.     

串联有源电力滤波器的参数选择及仿真

针对典型的三相整流电路对电网产生的影响,介绍了串联有源电力滤波器电路参数设置,探讨了易于数字化的SVP-WM跟踪算法,应用于串联有源电力滤波器内层跟踪控制中的补偿效果。并用比较的方法,重点对串联有源电力滤波器电路进行了计算机仿真分析。     

基于ARM的图像采集与图像处理在太阳光跟踪系统中的实际应用

本文介绍了s3c2440开发板和ov7670为核心的图像采集与图像处理系统。该系统通过采集太阳在接收屏上的聚焦投影图像,并进行图像处理确定图像边界和图像中心,以此计算出太阳的高度偏角与水平偏角从而跟踪太阳。实验结果验证了该系统的可行性与正确性。     

基于DSP的车载卫星天线随动系统设计

本文介绍了一种基于DSP的车载卫星天线随动系统，包括工作原理、系统组成，软件设计及对实际中遇到的问题的处理。     

话题追踪技术研究综述

海量的网络媒体信息使得人们在有限的时间内难以全面地掌握一些话题的信息,这样容易导致部分重要信息的遗漏。话题检测与追踪技术正是在这种需求下产生的。这种技术可以从庞大的信息集合中快速准确地获取人们感兴趣的内容。近几年,话题检测与追踪技术已成为自然语言处理领域热门的研究方向,它能把大量的信息有效地组织起来,并使用相关技术从中挖掘出有用的信息,用简洁有效的方式让人们了解一个事件或现象中所有细节以及它们之间的相关性。对话题跟踪的研究背景、相关概念、评测方法以及相关技术进行了综述,并总结了当前的相关技术。     

The impact of tracking by attainment on pupil self-confidence over time: demonstrating the accumulative impact of self-fulfilling prophecy

Abstract

The impact of self-fulfilling prophecy in education, and of attainment grouping on pupil self-perception, remain topics of longstanding debate, with important consequences for social in/justice. Focusing on self-confidence, this article draws on survey responses from 9,059 12-13 year olds who were tracked by subject (‘setting’). They provided survey responses when placed in ‘ability’ sets at the start of their secondary schooling, and again late the following year; enabling analysis of impact over time. After controlling for prior attainment, the gap in general self-confidence between students in the top and bottom sets for mathematics is shown to widen over time, and high set students’ self-confidence in English had also grown significantly; although there was not further widening in the cases of self-confidence in mathematics or in general self-confidence between students in the top and bottom sets for English. Implications of these findings for interventions directed at addressing educational disadvantage are discussed.     

前瞻跟踪观初探

前瞻跟踪观是语言规范理论与方法的一大变革和发展,在这一变革和发展中,起决定作用的是语言潜显理论,它把语言放在一个全息的系统中去考察,容纳语言发展的整个过程,以交际值作为衡量语言规范的标准。     

多雷达综合:航迹合成(英文)

目前多雷达跟踪空中交通管制系统的雷达数据处理有两种方法,其中之一是航迹合成法。本文讨论把来自不同雷达站的同一目标的当地航迹合成唯一的一条系统航迹的方法和主要问题,并具体讨论了其中座标变换的问题,分析了由于变换公式的近似引起的实际变换误差。     

一种改进的遗传进化算法及其应用

基本遗传算法适应度及遗传算子设计简单,求解复杂优化问题易于早熟,收敛速度慢等缺点.基于遗传算法基本框架,设计新的适应度函数,减少遗传算法中的交叉算子,改进其变异方式,提出一种改进的遗传进化算法.