Ecient indexing in a class hierarchy is essential for the achievement of high performance in query evaluation for object database management systems. In this paper, we present a practical indexing scheme, index set, which provides good index con®guration for any real database environment. The proposed scheme considers the distribution of key values, as well as query patterns such as query weig...

PURPOSE This study was conducted to determine the effect of physical education class enrollment and physical activity on academic achievement in middle school children. METHODS Participants were 214 sixth-grade students randomly assigned to physical education during either first or second semesters. Moderate and vigorous physical activity (MVPA) (number of 30-min time blocks) outside of schoo...

Visuospatial competencies are related to performance in mathematical domains in adulthood, but are not consistently related to mathematics achievement in children. We confirmed the latter for first graders and demonstrated that children who show above average first-to-fifth grade gains in visuospatial memory have an advantage over other children in mathematics. The study involved the assessment...

Introduction: Research about student performance has traditionally considered academic procrastination as a behavior that has negative effects on academic achievement. Although there is much evidence for this in class-based environments, there is a lack of research on Computer-Based Learning Environments (CBLEs). Therefore, the purpose of this study is to evaluate student behavior in a blended ...

BACKGROUND Few data are available about the very long-term outcome of patients with proliferative lupus nephritis. METHODS Ninety-three Italian patients with biopsy-proven proliferative lupus nephritis (15 with class III, 9 with class III+V, 64 with class IV and 5 with class IV+V) followed for a median follow-up of 15 years in a single renal unit were considered for this observational study. ...

This study investigated language teaching strategies, as reported by teachers and students, and the effects of these strategies on students’ motivation and English achievement. The participants consisted of 31 English as a foreign language (EFL) teachers and their students (N = 694) in Catalonia, Spain. The teachers and students rated the frequency of use of 26 strategies in their classes. In a...

Language learners have frequently been classified according to individual difference variables such as aptitude, personality, cognitive style, and motivation. However, a language teacher’s view seems to have been missing from such classifications. This exploratory research investigated whether and by which criteria Iranian EFL teachers classify their students. Based on preliminary interviews wi...

American universities increasingly admit first-generation college students whose parents do not have 4-year degrees. Once admitted, these students tend to struggle academically, compared with continuing-generation students--students who have at least 1 parent with a 4-year degree. We propose a cultural mismatch theory that identifies 1 important source of this social class achievement gap. Four...

American universities increasingly admit first-generation college students whose parents do not have 4-year degrees. Once admitted, these students tend to struggle academically, compared with continuing-generation students—students who have at least 1 parent with a 4-year degree. We propose a cultural mismatch theory that identifies 1 important source of this social class achievement gap. Four ...

We investigated the effects of adverse birth characteristics and social disadvantage upon educational outcomes over the lifecourse and across generations. Our subjects were 12,674 Swedish infants born 1915-1929 and 9,706 of their grandchildren born 1973-1980. Within both cohorts, better school achievement (schoolmarks in elementary school) was predicted by: heavier birthweight, lower birth orde...