Sorting on GPUs for large scale datasets: A thorough comparison

Although sort has been extensively studied in many research works, it still remains a challenge in particular if we consider the implications of novel processor technologies such as manycores (i.e. GPUs, Cell/BE, multicore, etc.). In this paper, we compare different algorithms for sorting integers on stream multiprocessors and we discuss their viability on large datasets (such as those managed by search engines). In order to fully exploit the potentiality of the underlying architecture, we designed an optimized version of sorting network in the K-model, a novel computational model designed to consider all the important features of many-core architectures. According to K-model, our bitonic sorting network mapping improves the three main aspects of many-core architectures, i.e. the processors exploitation, and the on-chip/off-chip memory bandwidth utilization. Furthermore we are able to attain a space complexity of Θ(1). We experimentally compare our solution with state-of-the-art ones (namely, Quicksort and Radixsort) on GPUs. We also compute the complexity in the K-model for such algorithms. The conducted evaluation highlight that our bitonic sorting network is faster than Quicksort and slightly slower than radix, yet being an in-place solution it consumes less memory than both algorithms.     

Parental Job Loss and Early Child Development in the Great Recession

The study examines whether and why parental job loss may stifle early child development, relying on cohort data from the population of children born in Ireland in 2007–2008 (N = 6,303) and followed around the time of the Great Recession (2008–2013). A novel approach to mediation analysis is deployed, testing expectations from models of family investment and family stress. Parental job loss exacerbates problem behavior at ages 3 and 5 (.05–.08 SDs), via the channels of parental income and maternal negative parenting. By depressing parental income, job loss also hampers children’s verbal ability at age 3 (.03 SDs). This is tied to reduced affordability of formal childcare, highlighting a policy lever that might tame the intergenerational toll of job loss.     

The links between pedagogical competence,instructional quality,and mathematics achievement in the lower secondary classroom

Educational Studies in Mathematics - It is widely assumed that teachers play a key role in providing high-quality learning opportunities to students and fostering students’ learning. Yet it...     

Efficiency of Targeted Multistage Calibration Designs Under Practical Constraints: A Simulation Study

Calibration of an item bank for computer adaptive testing requires substantial resources. In this study, we investigated whether the efficiency of calibration under the Rasch model could be enhanced by improving the match between item difficulty and student ability. We introduced targeted multistage calibration designs, a design type that considers ability‐related background variables and performance for assigning students to suitable items. Furthermore, we investigated whether uncertainty about item difficulty could impair the assembling of efficient designs. The results indicated that targeted multistage calibration designs were more efficient than ordinary targeted designs under optimal conditions. Limited knowledge about item difficulty reduced the efficiency of one of the two investigated targeted multistage calibration designs, whereas targeted designs were more robust.     

Positive beliefs about errors as an important element of adaptive individual dealing with errors during academic learning

Research on learning from errors gives reason to assume that errors provide a high potential to facilitate deep learning if students are willing and able to take these learning opportunities. The first aim of this study was to analyse whether beliefs about errors as learning opportunities can be theoretically and empirically distinguished from adaptive reactions to errors in an affective-motivational sense (including the maintenance of motivation and activating emotions), and in terms of learning behaviour and metacognitive activities specifically adjusted in response to a specific error. The second aim was to validate the proposed distinction across different domains. The third aim was to investigate the added value of beliefs about errors besides domain-specific self-concept and mastery goal orientation for understanding the preconditions for adaptive reactions to errors at school. We assessed all variables in three different school subjects (N = 614 students, Grades 5–7). Confirmatory factor analyses indicated distinctness and a moderate domain specificity of error-related reactions. Positive error-related beliefs predicted students’ affective-motivational and action adaptivity of error reactions, above and beyond self-concepts and goal orientations. Taken together, the current findings provide a more complete understanding of the intra-personal mechanisms of adaptive responses to errors in different school subjects.     

The utilization,depoloyment and management of primary teachers in Africa South of the Sahara

A member of the programme staff of the International Institute for Educational Planning since 1988. Her principal research themes are education policy and the development of human resources, the role of examinations, and the administration and management of teachers. Main publications include:Stratégies d'innovations technologiques et politiques éducatives en France, en RFA et au Royaume-Uni [Strategies for innovative technology and educational policies in France, the Federal Republic of Germany and the United Kingdom] (1989) and (with F. Caillods and K. Lewin)Science education provision at secondary level: planning and policy issues [forthcoming].     

Implementation intentions and test anxiety: Shielding academic performance from distraction

College students whose test anxiety was measured completed a working memory-intensive math exam with televised distractions. Students were provided with implementation intentions (if–then plans; Gollwitzer, 1999) designed to either help them ignore the distractions (i.e., temptation-inhibiting plans) or focus more intently on the math exam (i.e., task-facilitating plans). Regression analyses showed that as test anxiety increased, the effectiveness of temptation-inhibiting implementation intentions increased, whereas task-facilitating implementation intentions increasingly harmed performance as test anxiety increased. In addition, the consequences of these plans differed significantly for those high in test anxiety. Implications for effective self-regulation by test-anxious students are discussed.     

Erstsprachförderung bei Migrantenkindern in Kindergärten

This contribution reports on an investigation into the importance of supporting first language for the command of first and second language skills using a quasi-experimental longitudinal study of migrant children in kindergarten. For two years the development of both first and second language skills was coordinated through the treatment of the same topics and stories during lessons. Furthermore, parents were asked to read their children a story or play an audio book in the first language three times a week. This extensive intervention neither had statistically significant effects on the development of language competency in the first nor the second language, German. The transfer effects between first and second language expected by the interdependency hypothesis of Cummins were only in evidence to a very limited extent.     

Classroom Climate,Cardiac Vagal Tone,and Inhibitory Control: Links to Focused Attention in First Graders

The present study aimed to investigate the role of classroom climate and self‐regulation in terms of cardiac vagal tone and inhibitory control in primary school students' focused attention. A combination of direct and indirect measures was used to assess classroom climate, sustained and selective attention, and inattention behaviors among 62 first graders. We also registered students' cardiac vagal tone at rest and their levels of inhibitory control in a reaction time task. A single underlying factor combining sustained and selective attention as well as (the lack of) inattention behaviors accounted for students' focused attention. A regression analysis revealed that classroom climate, cardiac vagal tone, and inhibitory control interacted to explain first graders' focused attention. In classrooms with a negative climate, high levels of inhibitory control attenuated the negative effect of low cardiac vagal tone on students' ability to remain focused during classroom activities. Implications for theory and practice are discussed.     

Characteristic behaviour orientations of young scientists: A comparison between young mathematicians/physicists and other natural scientists

Methods of sociological enquiry using data on qualifications, performance indicators, conditions for research and social background were used to investigate aspects of behaviour in young natural scientists relevant to research careers. It was shown that mathematicians and physicists were essentially more intrinsically motivated than the other cadres in the fields of natural sciences and that this manifested itself in a high intensity of work and a greater involvement in activities.