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Hideaki Ishigami 《Journal of sports sciences》2016,34(2):143-154
Relative age effect (RAE) in sports has been well documented. Recent studies investigate the effect of birthplace in addition to the RAE. The first objective of this study was to show the magnitude of the RAE in two major professional sports in Japan, baseball and soccer. Second, we examined the birthplace effect and compared its magnitude with that of the RAE. The effect sizes were estimated using a Bayesian hierarchical Poisson model with the number of players as dependent variable. The RAEs were 9.0% and 7.7% per month for soccer and baseball, respectively. These estimates imply that children born in the first month of a school year have about three times greater chance of becoming a professional player than those born in the last month of the year. Over half of the difference in likelihoods of becoming a professional player between birthplaces was accounted for by weather conditions, with the likelihood decreasing by 1% per snow day. An effect of population size was not detected in the data. By investigating different samples, we demonstrated that using quarterly data leads to underestimation and that the age range of sampled athletes should be set carefully. 相似文献
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Public library systems intersect with both public and private spheres of social life, but how they negotiate public legitimacy and private influence remains a mystery. To better understand this problem, this study adopts a communication system approach. Using qualitative content analysis, this study examines data from three US public library systems. This study analyzes how private actors communicate with and through public library systems by parsing the signals into components: transmitter, receiver, medium, and message. The resulting signals form two dimensions: the Public Sphere dimension, where private actors govern, legitimate, and use the library, and the Private Sphere dimension, where private actors exchange personal services and exert economic power. A view of public and private signals in interaction reveals how public legitimacy is threatened and how public library systems can mitigate these threats. This study reveals how public/private conflicts in public libraries arise and how they might be resolved. 相似文献
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Masanori Koizumi 《图书馆管理杂志》2013,53(8):659-690
ABSTRACTThe objective of this research is to elucidate changes in strategy, organization, and operations in the field of public library management. It uses research methods based on detailed case analysis. This research focuses on cases involving U.S. public libraries and the Tokyo Metropolitan Library in Japan from the 1960s to the 2010s. It analyzes documents related to strategic management, organization, and operations collected through surveys and interviews with library directors and managers. This research illustrates (1) 11 core operations of public libraries, (2) transitions of basic organizational structures, (3) elements that cause differences between the U.S. and Japanese public libraries, and (4) primary elements that have impacts on public library management. 相似文献
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Makoto Ayabe Peter H. Brubaker Yoshiyuki Sunami Hideaki Kumahara Yves Schutz Hiroaki Tanaka 《Journal of sports sciences》2013,31(16):1805-1814
AbstractThe purpose of the present investigation was to examine the relationship between the accumulation of 1000 steps in 10 minutes (1K) and 3000 steps in 30 minutes (3K) with the amount and intensity of daily physical activity. Thirty-three adults (16 males and 17 females, 53 ± 19 years) wore an accelerometer (Lifecorder) for seven consecutive days in order to determine the number of steps and the time spent in physical activity at light intensity (LPA), moderate intensity (MPA), vigorous intensity (VPA) and moderate to vigorous intensity (MVPA). Furthermore, based on the minute-by-minute stepping rate, the number, intensity and duration of walking bouts (1K and 3K) were evaluated. The daily number of steps, LPA, MPA and VPA were significantly higher on the days with 1K or 3K compared with that observed on the days without 1K or 3K (P <0.05). The duration of 1K was not found to be correlated with an MVPA >10 minutes. An MVPA >10 minutes was less than 2 min · day?1 on the days with 1K or 3K. Therefore, it is doubtful that the concept of cadence is an alternative indicator for the commonly used definition of MVPA. It remains unclear whether participation in 1K and 3K guarantees that an individual will meet the current MVPA guidelines. 相似文献
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Recent advances in technologies for neuroscientific research enable us to investigate the neurobiological substrates of the human ethical sense. This article introduces several findings in “the brain science of ethics” obtained through brain-observation and brain-manipulation approaches. Studies over the past decade have revealed that several brain structures associated with emotion processing and the ability to understand the minds of others play key roles in the human ethical sense. We also discuss current limitations in studying the brain mechanisms of ethics: Although the true significance of the human ethical sense lies in social interactions, most neuroimaging studies so far have not captured the rich context of the social interactions that exist in the real world. The latest experimental paradigms focusing on “neural resonance” across brains, as well as a newly developed neuroimaging instrument that allows a wide range of social interactions under natural situations, are promising to overcome this limitation. Applications of such approaches and instruments to study the human ethical sense will improve our understanding of the complex nature of the human ethical sense. 相似文献
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The purpose of the present investigation was to clarify the relationship between age and bout duration of physical activity (PA) under free-living conditions in female adults. Forty-three females wore an accelerometer (Lifecorder) for seven consecutive days in order to determine the time spent in PA at light intensity (LPA), at moderate intensity (MPA), and at vigorous intensity (VPA). The PA was divided according to the bout duration, such as PA lasting longer than 16 s, 32 s, 60 s, 3 min, >5 min, and >10 min (PA16s, PA32s, PA1m, PA3m, PA5m, PA10m). The time for LPA32s, LPA1m, MPA16s, VPA16s, and the total time for MPA and VPA were significantly associated with age (P < 0.05). There were no significant associations between age and PA lasting >60 s, regardless of intensity category. The results of the present pilot study suggest that the age-associated differences in PA occur mainly in PA lasting 1 min or shorter duration. 相似文献