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661.
The paper investigates the consensus problem for multi-agent systems with randomly occurring nonlinear dynamics and time-varying delay. A novel event-triggered scheme has been proposed, which can lead to a significant reduction in information communication in a network. By utilizing stochastic analysis and properties of the Kronecker product, consensus criteria are derived in the form of linear matrix inequalities, which can be readily solved using the standard numerical software. Finally, an illustrative example is used to show the effectiveness of the event-triggered scheme. 相似文献
662.
Drawing on data generated by a two-year ethnographic study in a high security Spanish prison, this article explores the multiple meanings given to the social practices of sport and physical activity. We provide details of the following key themes that emerged from the analysis: (a) escaping time; (b) perceived therapeutic benefits; (c) social control; (d) gendered dimensions; and (e) performing masculinity. The findings suggest that a diverse and contradictory set of meanings are associated with sport and physical activity within this particular prison culture, and that the performance of specific kinds of masculinity is both a process and product that shapes the construction of experience in powerful ways. 相似文献
663.
Winko W. An Vincy Wong Roy T.H. Cheung 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(4):375-383
Back injury is common in rowers. Asymmetrical lower limb reaction force on the foot stretchers during rowing may compromise trunk biomechanics and lead to back injury. However, such a mechanism remains putative. Therefore, this study examined lower limb reaction force in experienced rowers with and without a history of back injury. Six rowers who suffered from back injury for more than one week in the past year and another 19 rowers who were never injured performed maximal exertion rowing on a fixed-head rowing machine for 30 strokes. Peak force, average and peak loading rate of the lower limb reaction force during the middle 10-stroke were recorded using strain-gauge transducers placed at the foot stretchers. Asymmetries and intra-limb variability were quantified as asymmetry indices and coefficients of variation, respectively. No significant asymmetry was observed in all selected kinetic parameters between the injured and healthy rowers (p = 0.448–0.722, Hedges' g = 0.162–0.310). Subgroup analyses also did not reveal any significant kinetic differences between injured and healthy scullers or sweepers (p = 0.194–0.855, Hedges' g = 0.203–0.518). Rowers with a history of back injury, regardless of the rowing types, did not demonstrate greater lower limb reaction force asymmetry when compared with healthy rowers. 相似文献
664.
Samuel Yeung Shan Wong Frank Wan Kin Chan Chi Kei Lee Martin Li Fai Yeung Christopher Chor Ming Lum 《Journal of sports sciences》2013,31(3):295-302
Abstract The aims of the present study were to assess the maximal oxygen uptake and body composition of adult Chinese men and women, and to determine how these variables relate to age. The cross-sectional sample consisted of 196 men and 221 women aged 20 – 64 years. Maximal oxygen uptake ([Vdot]O2max) was determined by indirect calorimetry during a maximal exercise test on an electrically braked cycle ergometer. The correlations between [Vdot]O2max and fat mass were ?0.52 in men and ?0.58 in women. Linear regression defined the cross-sectional age-related decline in [Vdot]O2max as 0.35 ml · kg?1 · min?1 · year?1 in men and 0.30 ml · kg?1 · min?1 · year?1 in women. Multiple regression analysis showed that more than 50% of this cross-sectional decline in [Vdot]O2max was due to fat mass, lean mass, and age. Adding fat mass and lean mass to the multiple regression models reduced the age regression mass from 0.35 to 0.24 ml · kg?1 · min?1 · year?1 in men and from 0.30 to 0.15 ml · kg?1 · min?1 · year?1 in women. We conclude that age, fat mass, and lean mass are independent determinants of maximal oxygen uptake in Chinese adults. 相似文献
665.
What are the longitudinal cognitive profiles of Hong Kong Chinese children with specific reading difficulties in Chinese only, in English only, or both? A total of 16 poor readers each of Chinese (PC) and English (PE) and 8 poor readers of both orthographies (PB) were compared to a control sample (C) of 16 children; all were drawn from a statistically representative sample of 154 Hong Kong Chinese children tested at ages 5 to 9 years. PE and PB children's mothers had lower education levels than did the other groups. With children's ages and mothers' education levels statistically controlled, the PE, PC, and PB groups were significantly lower than the C group on phonological awareness. The PB and PE groups also scored significantly lower than the others on English vocabulary across years, whereas the PC and PB groups were significantly poorer than the C and PE groups on morphological awareness across years. Finally, the PB group was significantly slower than the other groups on speed naming at every age tested, underscoring the potential importance of automaticity in reading across orthographies. Findings highlight the need to consider the issue of how to identify reading difficulties in a second language. 相似文献
666.
Connie Suk-Han Ho Yau-Kai Wong Pui-Sze Yeung David Wai-ock Chan Kevin Kien-Hoa Chung Sau-Ching Lo Hui Luan 《Reading and writing》2012,25(4):857-886
The present study aimed at identifying core components of reading instruction in Chinese within the framework of the tiered
intervention model. A curriculum with four teaching components of cognitive-linguistic skills was implemented in a Program
school for 3 years since Grade 1. The findings showed that the Tier 1 intervention was effective in enhancing the literacy
and cognitive-linguistic skills of children in the Program school. The positive effects were maintained at the end of Grade
2. Progress in both word-level and text-level cognitive-linguistic skills predicted significantly progress in reading comprehension.
Based on the present findings, the four core reading components in Chinese were proposed—oral language, morphological awareness,
orthographic skills, and syntactic skills. Comparing the Big Five in English and the four core components in Chinese reflects
different cognitive demands for reading diverse orthographies. 相似文献
667.
Mok Sog Yee Bakaç Cafer Froehlich Laura 《International Journal for Educational and Vocational Guidance》2021,21(2):355-378
International Journal for Educational and Vocational Guidance - The utility value of an academic task can affect university students’ learning behavior and career choices. For... 相似文献
668.
Educational Psychology Review - Emotions can both facilitate and hinder learning. Emotional design features such as colors and shapes can be embedded in multimedia learning environments to... 相似文献
669.
Li Chunming He Limin Wong IpKin Anthony 《Education and Information Technologies》2021,26(4):4221-4239
Education and Information Technologies - This study explores the determinants that predict undergraduates’ intention to adopt e-learning for studying English on the basis of the extended... 相似文献
670.