A commentary on human performance technology     

Ed Blankenhagen 《Performance Improvement》1999,38(2):5-6

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LCSH,SKOS 和关联数据   总被引：7，自引：0，他引：7  

Ed Summers  Antoine Isaac  Clay Redding  Dan Krech  姚小乐  刘炜  张春景 《现代图书情报技术》2009,3(3):8-14

论述将美国国会图书馆MARCXML格式的主题标目转换为SKOS(RDF编码格式)的技术方法。着重阐述SKOS词表的优势、可能的扩展方向以及与其他语义网词表的整合,如都柏林核心集。还介绍一个利用关联数据（Linked Data）技术在网上发布词表的Web应用。  相似文献   

The Value of Reanalysis: TV Viewing and Attention Problems     

E. Michael Foster  Stephanie Watkins 《Child development》2010,81(1):368-375

Using data from the National Longitudinal Survey of Youth ( N  =   1,159), this study reexamines the link between maternal reports of television viewing at ages 1 and 3 and attention problems at age 7. This work represents a reanalysis and extension of recent research suggesting young children's television viewing causes subsequent attention problems. The nonlinear specification reveals the association between television watching and attention problems exists—if at all—only at very high levels of viewing. Adding 2 covariates to the regression model eliminated even this modest effect. The earlier findings are not robust. This study also considers whether its own findings are sensitive to unobserved confounding using fixed-effects estimation. In general, it finds no meaningful relation between television viewing and attention problems.  相似文献   

Effect of exercise and nasal splinting on static and dynamic measures of nasal airflow     

Erik W. Faria  Cindy Foster  Irvin E. Faria 《Journal of sports sciences》2013,31(4):255-261

The main aim of this study was to assess the separate and combined effects of exercise and nasal splinting on static and dynamic measures of nasal airflow. In a randomized crossover design, 12 healthy participants (6 men, 6 women) performed static and dynamic spirometric nasal airflow assessment tests, with or without nasal splinting (Breathe-Right?), before and after a maximal oxygen uptake (VO 2max ) treadmill test. At least 7 days later, the V O 2max and nasal airflow tests were repeated. The results showed that the measured variables were not significantly different with and without nasal splinting. We conclude that the absence of significantly enhanced nasal patency observed for nasal splinting and after exercise suggest that these factors have a minimal impact on nasal airflow volume and rate.  相似文献   

The relationship between shoulder alignment and elbow joint angle in cricket fast-medium bowlers     

Mark Roca  Jacqueline Alderson  Daryl Foster 《Journal of sports sciences》2013,31(11):1127-1135

Abstract

The aim of this study was to examine the relationship between shoulder alignment and elbow angle during the delivery action of fast-medium bowlers. The elbow and upper trunk alignment were recorded for 13 high-performance bowlers (mean age 20 years) using a 12-camera Vicon motion analysis system operating at 250 Hz. The three highest velocity trials for “good” and “short” length deliveries were analysed. Results showed that bowlers with a more front-on shoulder alignment at back-foot impact and when the upper arm was horizontal to the ground experienced a significantly greater elbow flexion – extension range when compared with those who had a more side-on orientation at the same point in the delivery action. Bowlers with greater shoulder counter-rotation also recorded higher elbow flexion and subsequently extension during the period from upper arm horizontal to ball release. Shoulder alignment and elbow angles were similar for “short” and “good” length deliveries. It was concluded that bowlers with a more front-on shoulder orientation at back-foot impact demonstrated a higher elbow extension from upper arm horizontal to ball release and are therefore more likely to infringe International Cricket Council elbow tolerance levels, compared with those who adopt a more side-on shoulder orientation at back-foot impact.  相似文献   

Optimising technical skills and physical loading in small-sided basketball games     

Markus J. Klusemann  David B. Pyne  Carl Foster  Eric J. Drinkwater 《Journal of sports sciences》2013,31(14):1463-1471

Abstract

Differences in physiological, physical, and technical demands of small-sided basketball games related to the number of players, court size, and work-to-rest ratios are not well characterised. A controlled trial was conducted to compare the influence of number of players (2v2/4v4), court size (half/full court) and work-to-rest ratios (4x2.5 min/2x5 min) on the demands of small-sided games. Sixteen elite male and female junior players (aged 15–19 years) completed eight variations of a small-sided game in randomised order over a six-week period. Heart rate responses and rating of perceived exertion (RPE) were measured to assess the physiological load. Movement patterns and technical elements were assessed by video analysis. There were ～60% more technical elements in 2v2 and ～20% more in half court games. Heart rate (86 ± 4% & 83 ± 5% of maximum; mean ± SD) and RPE (8 ± 2 & 6 ± 2; scale 1–10) were moderately higher in 2v2 than 4v4 small-sided games, respectively. The 2v2 format elicited substantially more sprints (36 ±12%; mean ±90% confidence limits) and high intensity shuffling (75 ±17%) than 4v4. Full court games required substantially more jogging (9 ±6%) compared to half court games. Fewer players in small-sided basketball games substantially increases the technical, physiological and physical demands.  相似文献   

Specificity of a Maximal Step Exercise Test     

Lynn A. Darby Ph.D.  Jennifer L. Marsh M.Ed.  Patricia A. Shewokis Ph.D.  Roberta L. Pohlman Ph.D. 《Measurement in physical education and exercise science》2013,17(3):131-148

To adhere to the principle of “exercise specificity” exercise testing should be completed using the same physical activity that is performed during exercise training. The present study was designed to assess whether aerobic step exercisers have a greater maximal oxygen consumption (max VO₂) when tested using an activity specific, maximal step exercise test (SET; arms and legs) versus a maximal running test (legs only). Female aerobic step exercisers (N=18; 20.7 ± 1.5 years) performed three maximal graded exercise tests (GXTs): 2 SETs; 1 treadmill test (TMT). The SET consisted of six 3-min progressive stages of alternate lead, basic step, basic step with biceps curls, knee raise with pull-down, repeater knee with pull-down, lateral lunge with pull-down, and side squat with shoulder presses. Stepping rate was 32 steps· min^?1 on an 8-in (20.32 cm) step for stages 1–3, and a 10-in (25.4 cm) step for stages 4–6. Submaximal and maximal heart rate (HR) and oxygen consumption (VO₂) were recorded at the end of each stage. Test–retest reliability for the first five stages of the SET ranged from .91 to .97 for HR, and from .84 to .96 for VO₂. Maximal HR was significantly greater (p =.0001) for the SET (200 ± 6.2 beats·min^?1) as compared to the TMT (193 ± 7.9 beats·min^?1). No significant difference was found for max VO₂ (42.9 ± 8.5, 41.2 ± 5.9 ml·kg^?1·min^?1, p =.14). The SET was a valid and reliable protocol for assessing responses of these aerobic step exercisers; however, max VO₂ from a TMT did not differ significantly from the SET. Conversely, max HR obtained from the criterion TMT was 7 beats·min^?1 lower than from the SET. If a training HR for step exercise (arms and legs exercise) is prescribed based on the max HR from treadmill exercise (legs only), then the training HR should be calculated from a TMT max HR that has been increased by 7 beats·min^?1 to obtain an intensity of step exercise comparable to that of running.  相似文献   

A comparison of the spelling errors of older dyslexic and second-grade normal children     

Louisa Cook Moats Ed.D. 《Annals of dyslexia》1983,33(1):121-140

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Getting assessment right at the classroom level: using formative assessment for decision making     

Katherine A. Curry  Mwarumba Mwavita  Alexandra Holter  Ed Harris 《Educational Assessment, Evaluation and Accountability》2016,28(1):89-104

Current high-stakes accountability mandates emphasize data use for school improvement. However, teachers often lack training for effective data use, and data is often too far removed from students to actually influence instructional practice. This qualitative case study was designed to gain a better understanding of a district-wide, teacher-centered approach to data use. Findings suggest that when data is used to “inform” instruction rather than “evaluate” instruction, teachers begin to practice reflective teaching. A common language emerged across grade levels facilitating a collaborative approach to data use. Using the theoretical framework of Self-Determination Theory, we propose a data informed instructional theoretical model that stakeholders in K-12 education systems can use to enhance instruction and learning at the classroom level. This teacher-centered model is of particular importance as a framework to build collective capacity by meeting psychological needs of teachers of autonomy, competence, and relatedness.  相似文献   

Case Studies as Spurious Evaluations: The Example of Research on Educatioal Inequalities     

Peter Foster  Roger Gomm  & Martyn Hammersley 《British Journal of Educational Studies》2000,48(3):215-230

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