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41.
Marije T. Elferink-Gemser Chris Visscher Koen A. P. M. Lemmink Theo Mulder 《Journal of sports sciences》2013,31(4):481-489
Abstract To identify performance characteristics that could help predict future elite field hockey players, we measured the anthropometric, physiological, technical, tactical, and psychological characteristics of 30 elite and 35 sub-elite youth players at the end of three consecutive seasons. The mean age of the players at the end of the first season was 14.2 years (s = 1.1). Repeated-measures analyses of covariance, with standard of performance and measurement occasion as factors and age as a covariate, showed that the elite players fared better than the sub-elite players on technical and tactical variables. Female elite youth players also scored better on interval endurance capacity, motivation, and confidence. Future elite players appear to have excellent tactical skills by the age of 14. They also have good specific technical skills and develop these together with interval endurance capacity better than sub-elite youth players in the subsequent 2 years. To verify our conclusions, we will be tracking these players into adulthood. 相似文献
42.
Jake A. McMullen Koen Veermans Kaarina Laine 《Scandinavian Journal of Educational Research》2014,58(5):624-638
Despite the recent technical and theoretical advances in the investigation of children's social relations, the inherent complexity of these methods may prevent their easy integration into the classroom. A simple and effective tool can be valuable for teachers who wish to investigate students' social realities in the classroom. Therefore, the present study aims to identify an effective sociometric method for educator's use in the classroom. Nine separate sociometric categorisations were created from peer reports of grade one students (N = 748). Methods that have different collection methods (nominations or ratings) show surprisingly low agreement, unlike those with the same collection method. Methods based on peer nominations showed the strongest correlations with students' behavioural traits. Based on these results, we discuss the relevance and usefulness of such methods for use by classroom teachers in identifying students' social realities. 相似文献
43.
Koen Jonkers 《Research Policy》2011,40(9):1295-1306
This paper presents an analytical framework for the comparative analysis of National Research Systems. We follow evolutionary accounts of the research system in combination with insights from functionalist economics of innovation and organisational theorists. We also illustrate the potential use of this framework by applying it to an analysis of the Chinese research system's transformation between 1980 and 2005. During this period, this system is considered to have gradually changed from a centrally planned system to a mixed model. This implies a move in the direction of a ‘perfect market ideal type’. The increased performance of the overarching functions of the research system can be partially explained by these institutional changes. 相似文献
44.
The present study investigates the effects that concreteness fading has on learning and transfer across three grade levels (4–6) in elementary school science education in comparison to learning with constantly concrete representations. 127 9- to 12-years-old elementary school students studied electric circuits in a computer-based simulation environment, where circuits remained concrete (bulbs) throughout the learning or faded from concrete to abstract (bulbs to resistors). The most important finding was that the outcomes seemed to be influenced by a developmental factor: the study found a significant interaction between condition and grade level in relation to learning outcomes, suggesting that the outcomes generally improved as a function of grade level, but that there were notable differences between the conditions regarding the improvement of outcomes across the three grades. According the results, learning with constantly concrete representations either took less time or resulted in better learning compared to concreteness fading. Because transfer is one of the central arguments for concreteness fading, a somewhat surprising finding was that the concrete condition succeeded at least as well as the fading condition on transfer tasks. The study also discusses why the results and issues related to the conceptualisation and operationalisation of central concepts in the study call for caution towards generalization and for more research with young learners across different grades. 相似文献
45.
Stephan van der Zwaard Guido Weide Koen Levels Michelle R. I. Eikelboom Dionne A. Noordhof Mathijs J. Hofmijster 《Journal of sports sciences》2018,36(18):2111-2120
Rowers need to combine high sprint and endurance capacities. Muscle morphology largely explains muscle power generating capacity, however, little is known on how muscle morphology relates to rowing performance measures. The aim was to determine how muscle morphology of the vastus lateralis relates to rowing ergometer performance, sprint and endurance capacity of Olympic rowers. Eighteen rowers (12♂, 6♀, who competed at 2016 Olympics) performed an incremental rowing test to obtain maximal oxygen consumption, reflecting endurance capacity. Sprint capacity was assessed by Wingate cycling peak power. M. vastus lateralis morphology (volume, physiological cross-sectional area, fascicle length and pennation angle) was derived from 3-dimensional ultrasound imaging. Thirteen rowers (7♂, 6♀) completed a 2000-m rowing ergometer time trial. Muscle volume largely explained variance in 2000-m rowing performance (R2 = 0.85), maximal oxygen consumption (R2 = 0.65), and Wingate peak power (R2 = 0.82). When normalized for differences in body size, maximal oxygen consumption and Wingate peak power were negatively related in males (r = ?0.94). Fascicle length, not physiological cross-sectional area, attributed to normalized peak power. In conclusion, vastus lateralis volume largely explains variance in rowing ergometer performance, sprint and endurance capacity. For a high normalized sprint capacity, athletes may benefit from long fascicles rather than a large physiological cross-sectional area. 相似文献
46.
Koen Put Johan Wagemans Jochim Spitz A. Mark Williams 《Journal of sports sciences》2016,34(2):181-189
In association football, the difficulty in making offside decisions depends on both perceptual and cognitive processes. Therefore, the objectives of the present study were to enhance the decision-making skills of assistant referees by further developing their ability to (1) time slice the incoming information flow into series of isolated time frames during an ongoing offside situation and (2) use this information to mentally read off the spatial positions of the key-role players. Training (n = 10) and control groups (n = 10) were exposed to a pre- and post-test, consisting of an offside decision-making and frame recognition test. In the latter, assistant referees were asked to indicate which of five photos best represented the spatial position of the defender and attacker at the moment of the pass. Only the training group received 12 web-based offside training sessions. First, the training group improved in mentally freezing, holding and scanning the mental picture of the offside situation in short-term memory from pre- to post-test, as evidenced by an increased recognition accuracy. Second, the improvement in recognition accuracy resulted in enhanced performance on the offside decision-making task. The benefits of web-based training are highlighted. 相似文献
47.
Koen Luwel Lieven Verschaffel 《European Journal of Psychology of Education - EJPE》2008,23(3):319-338
Groups of mathematically strong and weak second-, fourth- and sixth-graders were individually confronted with numerosities
smaller and larger than 100 embedded in one-, two- or three-dimensional realistic contexts. While one third of these contexts
were totally unstructured (e.g., an irregular piece of land jumbled up with 72 cars), another third had a clear structure
(e.g., a 16x4 rectangular parking lot completely filled with 64 cars), and a last third had a “semi-structure” (e.g., the
same 16x4 parking lot but with a number of cars missing). Besides analyzing the effects of different task and subject variables
on pupils’ accuracy and response-time data, the study involved and analysis of their estimation strategies, with an emphasis
on multiplicative strategies that profited by some of the tasks’ geometrical (semi-)structure. It was found that many children
actually made use of such strategies, that using these strategies did however not always led to accurate estimations, and
that their frequency and efficiency increased with age. 相似文献
48.
Thomas Valérie De Backer Free Peeters Jeltsen Lombaerts Koen 《Learning Environments Research》2019,22(3):345-363
Both parental involvement and self-regulated learning are important predictors of students’ study success. However, previous research on self-regulated learning has focused instead on the school environment and has not focused on the home situation. In particular, investigations into the role of parents in self-regulated learning when children enter middle school have been limited. The present study examined the relationship among students’ perceptions of parental involvement, their self-regulated learning and school achievement in the first year of middle school. Survey data from 5939 Flemish students were processed using mediation analyses and revealed that students’ perceptions of parental involvement in school work was associated with students’ self-regulated learning and their school achievement. Moreover, how students perceived parental involvement was associated with students’ achievement through the self-regulated learning factors. These results underpin the importance of parents in education at the middle-school age. Schools should be aware of this and enhance parents’ educational involvement and the stimulation of self-regulated learning in the home environment.
相似文献49.
Michael Schneider Simon Merz Johannes Stricker Bert De Smedt Joke Torbeyns Lieven Verschaffel Koen Luwel 《Child development》2018,89(5):1467-1484
The number line estimation task is widely used to investigate mathematical learning and development. The present meta‐analysis statistically synthesized the extensive evidence on the correlation between number line estimation and broader mathematical competence. Averaged over 263 effect sizes with 10,576 participants with sample mean ages from 4 to 14 years, this correlation was r = .443. The correlation increased with age, mainly because it was higher for fractions than for whole numbers. The correlation remained stable across a wide range of task variants and mathematical competence measures (i.e., counting, arithmetic, school achievement). These findings demonstrate that the task is a robust tool for diagnosing and predicting broader mathematical competence and should be further investigated in developmental and experimental training studies. 相似文献
50.
Toward a systematic framework for research on dominant designs, technological innovations, and industrial change 总被引：1，自引：0，他引：1
The concept of a dominant design has taken on a quasi-paradigmatic status in analyses of the link between technological and industrial dynamics. A review of the empirical literature reveals a variety of interpretations about some aspects of the phenomenon such as its underlying causal mechanisms and its level of analysis. To stimulate further progress in empirical research on dominant designs, we advocate a standardization of terminology by conceptualizing products as complex artifacts that evolve in the form of a nested hierarchy of technology cycles. Such a nested complex system perspective provides both unambiguous definitions of dominant designs (stable core components that can be stable interfaces) and inclusion of multiple levels of analysis (system, subsystems, components). We introduce the concept of an operational principle and offer a systematic definition of core and peripheral subsystems based on the concept of pleiotropy. We also discuss how the proposed terminological standardization can stimulate cumulative research on dominant designs. 相似文献