Winsock的异步模式探讨     

池莹 《科技广场》2007,(5):63-65

讨论了使用Winsock实现异步通信的I/O模型的特点,通过分析比较,总结了各种I/O模型的适用情况,为应用开发提供了合理的建议。  相似文献   

“How Do I Love Thee”和《上邪》的对比赏析     

万惠蓉 《四川教育学院学报》2011,27(3):84-86

通过对英诗How do I love thee和汉乐府民歌《上邪》的对比欣赏,阐释中英诗歌的异同与爱情的永恒主题。  相似文献   

Can districts keep good teachers in the schools that need them most?     

Cassandra M. Guarino  Abigail B. Brown  Adam E. Wyse 《Economics of Education Review》2011,30(5):962-979

This study investigates how school demographics and their interactions with policies affect the mobility behaviors of public school teachers with various human capital characteristics. Using data from North Carolina from 1995 to 2006, it finds that teachers’ career stage and human capital investments dominate their decisions to leave public school teaching and school demographic characteristics play a dominant role in intra-system sorting. Schools serving at-risk children struggle to attract and retain teachers with desirable observable characteristics. We find evidence to suggest that across-the-board school-based pay-for-performance policies have small but significant associations with mobility decisions and appear to exacerbate inequities in the distribution of teacher qualifications.  相似文献   

College selectivity and young adult health behaviors     

Jason M. Fletcher  David E. Frisvold 《Economics of Education Review》2011,30(5):826-837

Large literatures have shown important links between the quantity of completed education and health outcomes on one hand and the quality or selectivity of schooling on a host of adult outcomes, such as wages, on the other hand. However, little research attempts to produce evidence of the link between school quality and health. The paper presents the first evidence in the literature on the potential short and intermediate term effects of attending a selective college on health behaviors during and following college attendance. Using a variety of empirical methods, this paper shows strong evidence that college selectivity reduces tobacco and marijuana use but has small and possibly positive effects on binge drinking. The effects on weight behaviors are suggestive of reduced weight, potentially through diet, but not exercise change.  相似文献   

Poisoning the mind: Arsenic contamination of drinking water wells and children's educational achievement in rural Bangladesh     

M. Niaz Asadullah  Nazmul Chaudhury 《Economics of Education Review》2011,30(5):873-888

Bangladesh has experienced the largest mass poisoning of a population in history owing to contamination of groundwater with naturally occurring inorganic arsenic. Prolonged drinking of such water risks development of diseases and therefore has implications for children's cognitive and psychological development. This study examines the effect of arsenic contamination of tubewells, the primary source of drinking water at home, on the learning outcome of school-going children in rural Bangladesh using recent nationally representative data on secondary school children. We unambiguously find a negative and statistically significant correlation between mathematics scores and arsenic-contaminated drinking tubewells at home, net of the child's socio-economic status, parental background and school specific unobserved correlates of learning. Similar correlations are found for an alternative measure of student achievement and subjective well-being (i.e. self-reported measure of life satisfaction), of the student. We conclude by discussing the policy implication of our findings in the context of the current debate over the adverse effect of arsenic poisoning on children.  相似文献   

Keeping up with the Joneses: Institutional changes following the adoption of a merit aid policy     

Amanda L. Griffith 《Economics of Education Review》2011,30(5):1022-1033

The increasing use by private colleges and universities of financial aid based on “merit”, as opposed to based solely on financial need has caused many to raise concerns that this type of aid will go mainly to higher income students crowding out aid to lower income students. However, some analysts suggest that by attracting more “almost full-paying” students through the use of merit aid, institutions will have more financial resources that they can use to increase their financial aid to low-income students and thus their enrollment. Results using data from the College Board's Annual Survey of Colleges and other secondary data sources suggest that the increased use of merit aid is associated with a decrease in enrollment of low-income and minority students, particularly at more selective institutions. Middle and bottom tier colleges may be offsetting costs with tuition increases, as the introduction of merit aid is accompanied by an increase in net costs.  相似文献   

Same work, lower grade? Student ethnicity and teachers’ subjective assessments     

Reyn van Ewijk 《Economics of Education Review》2011,30(5):1045-1058

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Conditional cash penalties in education: Evidence from the Learnfare experiment     

Thomas S. Dee 《Economics of Education Review》2011,30(5):924-937

Wisconsin's influential Learnfare initiative is a conditional cash penalty program that sanctions a family's welfare grant when covered teens fail to meet school attendance targets. In the presence of reference-dependent preferences, Learnfare provides uniquely powerful financial incentives for student performance. However, a 10-county random-assignment evaluation suggested that Learnfare had no sustained effects on school enrollment and attendance. This study evaluates the data from this randomized field experiment. In Milwaukee County, the Learnfare procedures were poorly implemented and the random-assignment process failed to produce balanced baseline traits. However, in the nine remaining counties, Learnfare increased school enrollment by 3.5 percent (effect size = 0.08) and attendance by 4.5 percent (effect size = 0.10). These results suggest that well-designed financial incentives may be an effective mechanism for improving the school persistence of at-risk students at scale.  相似文献   

Reevaluating the effect of non-teaching wages on teacher attrition     

Gregory A. Gilpin 《Economics of Education Review》2011,30(4):598-616

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The effects of adult literacy on earnings and employment     

Maúna Soares de Baldini Rocha Vladimir Ponczek 《Economics of Education Review》2011,30(4):755-764

This paper provides evidence of the effects of adult literacy on individuals’ income and employability in Brazil based on information obtained from the monthly employment survey (PME). The OLS results indicate that after controlling for observable characteristics, there is a 21.25% increase in wages for individuals who become literate; however, there is no significant impact on employability. Moreover, the findings show an 8.1% increase in the probability of being employed in the formal sector. We also explore the longitudinal structure of the dataset to control for unobservable fixed characteristics of individuals. The fixed-effects estimators show smaller effects compared to the OLS estimators. We find that literacy has a 4.4% effect on wages and a 4.3% impact on the probability of being formally employed. The effects are significantly different from zero.  相似文献