Roles of alternative and self-oriented perspectives in the context of the continued use of social network sites     

Young Sik Kang  Jinyoung Min  Jeoungkun Kim  Heeseok Lee 《International Journal of Information Management》2013

Individuals with a positive evaluation of a target system are likely to continue using the system, and this sustained use is likely to result in continued use. This target-oriented perspective has served as a major conceptual framework for understanding users’ behaviors in online contexts. The primary objective of this paper is to address two additional perspectives—alternative- and self-oriented perspectives—for a firmer understanding of continued use in the context of social network sites (SNS). A research model is built by employing regret and self-image congruity to represent these two perspectives. The model also examines the condition under which habits are formed and how this automatic mechanism influences the dynamics of the nomological network between intentions and behaviors. The analysis results of two rounds of surveys for capturing the actual link between intentions and behaviors indicate that regret and self-image congruity can play crucial roles in post-adoption phenomena in the context of SNS.  相似文献   

The effect of ball-carrying technique and experience on sprinting in rugby union     

Mark Walsh  Brad Young  Brian Hill  Kevin Kittredge  Thelma Horn 《Journal of sports sciences》2013,31(2):185-192

Abstract

There are several ways of carrying the ball in rugby union, which could influence the speed at which a player can run. We assessed 52 rugby players (34 males, 18 females) during a maximum sprint over 30 m without the ball, with the ball under one arm, and with the ball in both hands. Timing gates were used to measure time over the initial 10 m and the last 20 m. It has previously been reported (Grant et al., 2003 Grant, S. J., Oommen, G., McColl, G., Taylor, J., Watkins, L.Friel, N. 2003. The effects of ball carrying method on sprint speed in rugby union football players. Journal of Sports Sciences, 21: 1009–1015. [Taylor & Francis Online], [Web of Science ®] , [Google Scholar]) that running with the ball produces a slower sprinting speed than running without the ball. We hypothesized that the decrease in speed caused by carrying the ball would become less marked with the experience of the player. The male and female players were each divided into two groups: a “beginner” group that consisted of players in their first or second season and an “experienced” group that was composed of players who had played for more than two seasons. A 2 × 3 mixed-model analysis of variance was used to identify differences (P < 0.01) between the beginner and experienced groups in the three sprinting conditions. The times for the males for the first 10 m sprints without the ball, with the ball under one arm, and with the ball in both hands were 1.87 ± 0.08 s, 1.87 ± 0.08 s, and 1.91 ± 0.1 s for the beginners, and 1.87 ± 0.1, 1.88 ± 0.1 and 1.88 ± 0.12 for the more experienced players respectively. The times for the females for the first 10 m without the ball, with the ball under one arm, and with the ball in both hands were 2.13 ± 0.16 s, 2.19 ± 0.17 s, and 2.20 ± 0.16 s for the beginners, and 2.03 ± 0.12 s, 2.03 ± 0.09 s, and 2.04 ± 0.1 s for the more experienced players respectively. For the last 20 m of the 30-m sprint, there were differences between the different sprint conditions (P < 0.001) but no differences that were attributable to experience (P = 0.297). The times for the males over the last 20 m without the ball, with the ball under one arm, and with the ball in both hands were 2.58 ± 0.19 s, 2.61 ± 0.12 s, and 2.65 ± 0.12 s for the beginners, and 2.59 ± 0.12, 2.62 ± 0.23, and 2.65 ± 0.18 s for the more experienced players respectively. The times for the females over the last 20 m without the ball, with the ball under one arm, and with the ball in both hands were 3.25 ± 0.38 s, 3.35 ± 0.42 s, and 3.40 ± 0.46 s for the beginners, and 3.04 ± 0.32 s, 3.06 ± 0.22 s, and 3.13 ± 0.27 s for the more experienced players respectively. No gender-specific differences were detected. The results of this study suggest that practising sprints while carrying a ball benefits the early phase of sprinting while carrying the ball.  相似文献   

Effects of a feint on reactive agility performance     

Greg Henry  Brian Dawson  Brendan Lay  Warren Young 《Journal of sports sciences》2013,31(8):787-795

Abstract

This study compared reactive agility between higher-standard (n = 14) and lower-standard (n = 14) Australian footballers using a reactive agility test incorporating a life-size video image of another player changing direction, including and excluding a feint. Mean agility time in the feint trials was 34% (509 ± 243 ms; p < 0.001; effect size 3.06) longer than non-feint trials. In higher-standard players, agility time was shorter than for lower-standard players in both feint (114 ± 140 ms; p = 0.18; effect size 0.52; likely beneficial) and non-feint (32 ± 44 ms; p = 0.22; effect size 0.47; possibly beneficial) trials. Additionally, the inclusion of a feint resulted in movement time increasing over three times more in the lower-standard group (197 ± 91 ms; p = 0.001; effect size 1.07; almost certainly detrimental) than the higher-standard group (62 ± 86 ms; p = 0.23; effect size 0.66; likely detrimental). There were weak correlations between the feint and non-feint trials (r = ?0.13–0.14; p > 0.05), suggesting that reactive agility involving a feint is a unique skill. Also, higher-standard players are more agile than their lower-standard peers, whose movement speed deteriorates more as task complexity increases with the inclusion of a feint. These results support the need for specific training in multi-turn reactive agility tasks.  相似文献   

The relationship between cardiac autonomic function and maximal oxygen uptake response to high-intensity intermittent-exercise training     

Stephen H. Boutcher  Young Park  Sarah Louise Dunn  Yati N. Boutcher 《Journal of sports sciences》2013,31(9):1024-1029

Abstract

Major individual differences in the maximal oxygen uptake response to aerobic training have been documented. Vagal influence on the heart has been shown to contribute to changes in aerobic fitness. Whether vagal influence on the heart also predicts maximal oxygen uptake response to interval-sprinting training, however, is undetermined. Thus, the relationship between baseline vagal activity and the maximal oxygen uptake response to interval-sprinting training was examined. Exercisers (n?=?16) exercised three times a week for 12 weeks, whereas controls did no exercise (n?=?16). Interval-sprinting consisted of 20 min of intermittent sprinting on a cycle ergometer (8 s sprint, 12 s recovery). Maximal oxygen uptake was assessed using open-circuit spirometry. Vagal influence was assessed through frequency analysis of heart rate variability. Participants were aged 22 ± 4.5 years and had a body mass of 72.7 ± 18.9 kg, a body mass index of 26.9 ± 3.9 kg · m^?2, and a maximal oxygen uptake of 28 ± 7.4 ml · kg^?1 · min^?1. Overall increase in maximal oxygen uptake after the training programme, despite being anaerobic in nature, was 19 ± 1.2%. Change in maximal oxygen uptake was correlated with initial baseline heart rate variability high-frequency power in normalised units (r?=?0.58; P < 0.05). Thus, cardiac vagal modulation of heart rate was associated with the aerobic training response after 12 weeks of high-intensity intermittent-exercise. The mechanisms underlying the relationship between the aerobic training response and resting heart rate variability need to be established before practical implications can be identified.  相似文献   

Juan Ramon Jimenez and the poetry of T. S. Eliot     

Howard T. Young 《Culture, Theory & Critique》2013,54(1):155-165

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Influence of Type D personality on quality of life in university students: The mediating effect of health-promoting behavior and subjective health status     

Sung Reul Kim  Ju-Hee Nho  Hye Young Kim 《Psychology in the schools》2020,57(5):768-782

This study aimed to test a hypothetical path model estimating the influence of Type D personality on health-promoting behaviors (HPB), subjective health status, and quality of life (QoL) in university students, and to verify the mediating effects of HPB and subjective health status between Type D personality and QoL. A structural equation model involving 380 university students was used. Data were collected between November and December 2018 via structured questionnaires and analyzed using SPSS 25.0 and Amos 23.0. The model's fit indices were adequate. Type D personality had a direct effect on QoL and an indirect effect on QoL via HPB and subjective health status. Type D personality, HPB, and subjective health status explained 67.6% of the total variance in QoL. Intervention programs that consider Type D personality, HPB, and subjective health status may be useful to improve university students' QoL.  相似文献   

排球核心力量应用实践探析     

尹沛  满昌慧 《体育科技文献通报》2020,(6):139-140

核心力量训练对排球各个技术动作的高质量完成运动具有重要的作用。本文通过查阅与整理相关资料,总结出核心力量在排球运动中的重要作用及主要训练方法,为排球的教学、训练提供参考。  相似文献   

HKUST’s Experience with CONSER: A Two Decade Partnership     

Shuk Man Ada Cheung 《Cataloging & classification quarterly》2020,58(3-4):342-350

Abstract

The Library of the Hong Kong University of Science and Technology (HKUST), as the only CONSER full member outside North America, has entered into its twentieth year of CONSER membership. This article provides a historical overview of the Library’s participation in the program, its considerations and concerns when it first joined CONSER, and challenges and benefits it experienced over the years. The PCC-related activities that the Library has participated in have increased its growth in the field. The article concludes with future challenges the Library and its community will face.  相似文献   

Unboxing mathematics: creating a culture of modeling as critic     

Gibbs  Antonnette M.  Park  Joo Young 《Educational Studies in Mathematics》2022,110(1):167-192

Educational Studies in Mathematics - From the socio-critical perspective of mathematical modeling, reflexive discussions about the nature, criteria, and consequences of mathematical models are not...  相似文献   

The End of Nostradamus: Killing Predictive Check-In Without Feeling Guilty     

Bob Persing  Young Joo Moon 《期刊图书馆员》2014,66(1-4):115-122

Computer systems for receiving serial issues have existed for over 50 years. Their functionality has gradually become more complex and predictive. A new generation of check-in systems is currently being developed, some of which have decided to include less-complex check-in systems. The presenters discuss the history of check-in systems, and give case studies of two new systems that have chosen a simpler design for serials receiving.  相似文献