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...     

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].     

Excluded girls: interpersonal,institutional and structural violence in schooling

School exclusion and violence are defined with boys as the reference point and relatively little attention is given to the various forms of exclusion—disciplinary exclusion, self‐exclusion and withdrawal from learning—to which girls are subject. Girls in difficulty at school receive less attention than their male peers from policy‐makers, teachers and researchers. They find it more difficult to access resources. The concept of exclusion needs to be expanded to encompass girls’ experiences. This paper explores the policy context in which girls’ exclusion occurs and examines contributory factors, arguing that together they constitute systemic violence. Forms of violence include verbal abuse, psychological violence and the everyday “incivilities” which often go unchallenged in school cultures. The paper draws on research which privileged student voices and considered them alongside those of service providers, to analyse girls’ school experiences, examining violence and exclusion at interpersonal, institutional and structural levels. Issues such as bullying, self‐exclusion, learning difficulties, peer relationships, teacher–student relationships and student pregnancies are considered.     

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.     

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.     

Teachers' biographies and educational development: a Kenyan case study

Over the last decade there has been a growing interest among academics in the lives and work of teachers in industrialised countries. Many of these studies have sought to understand how teachers perceive their work and how they develop their particular professional identities. There is a growing recognition of the impact of teachers' own biographies on their training and on curriculum development and implementation. This paper examines the perspectives of a group of Kenyan educators, advisors and inspectors, from different regions, who have taken part in a national project designed to strengthen primary education through the in-service training of teachers. The aim is to examine the potential of biographical research to provide new insights into the processes of educational development. The participants in the research reflect on their own career development and life histories; on their identities, both professional and personal; and on the impact of these on their work. Drawing on an issue which divided the group, that of gender equality, the paper considers some of the biographical and cultural factors which permit and restrict development.