Community College Finance: A Guide for Institutional Leaders     

Jose E. da Silva 《Community College Journal of Research & Practice》2013,37(7):462-463

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Criterion-related validity of the 20-m shuttle run test in youths aged 13–19 years     

Jonatan R. Ruiz  Gustavo Silva  Norton Oliveira  José C. Ribeiro  Jose F. Oliveira  Jorge Mota 《Journal of sports sciences》2013,31(9):899-906

Abstract

We assessed the agreement between maximal oxygen consumption ([Vdot]O_2max) measured directly when performing the 20-m shuttle run test and estimated [Vdot]O_2max from five different equations (i.e. Barnett, equations a and b; Léger; Matsuzaka; and Ruiz) in youths. The 20-m shuttle run test was performed by 26 girls (mean age 14.6 years, s = 1.5; body mass 57.2 kg, s = 8.9; height 1.60 m, s = 0.06) and 22 boys (age 15.0 years, s = 1.6; body mass 63.5 kg, s = 11.5; height 1.70 m, s = 0.01). The participants wore a portable gas analyser (K4b2, Cosmed) to measure [Vdot]O₂ during the test. All the equations significantly underestimated directly measured [Vdot]O_2max, except Barnett's (b) equation. The mean difference ranged from 1.3 ml · kg^?1 · min^?1 (Barnett (b)) to 5.5 ml · kg^?1 · min^?1 (Léger). The standard error of the estimate ranged from 5.3 ml · kg^?1 · min^?1 (Ruiz) to 6.5 ml · kg^?1 · min^?1 (Léger), and the percentage error ranged from 21.2% (Ruiz) to 38.3% (Léger). The accuracy of the equations available to estimate [Vdot]O_2max from the 20-m shuttle run test is questionable at the individual level. Furthermore, special attention should be paid when comparisons are made between studies (e.g. population-based studies) using different equations. The results of the present study suggest that Barnett's (b) equation provides the closest agreement with directly measured [Vdot]O_2max (cardiorespiratory fitness) in youth.  相似文献   

Patterns of accelerometer-derived sedentary time across the lifespan     

Diana A. Santos  Pedro B. Júdice  João P. Magalhães  Inês R. Correia  Analiza M. Silva  Fátima Baptista 《Journal of sports sciences》2013,31(24):2809-2817

ABSTRACT

We aimed to describe ST and its patterns on a national level. A hip-worn accelerometer (ActiGraph GT1M) was used to collect data during waking hours from 4575 Portuguese’ participants from 2007–2009 (2683 females) aged 10–102 years old. Data was presented by sex, in 5-years age intervals, and by adolescents (n=2833), adults (n=1122), and older adults (n=620). Lambda-mu-sigma (LMS) smoothed percentile curves were estimated. Girls, women, and older women spent 61, 57, and 64% of wear time in ST, respectively. In males, ST represented 57, 60, and 62% of wear time respectively for boys, men, and older men. Comparing to other age groups, older adults spent a larger amount of ST in bouts ≥30-min (women: 33%, men: 39% of total ST). The number of breaks/ST hour were: 10.6 in girls, 11.7 in women, and 9.6 in older women. In males, the number of breaks/ST hour were: 11.2, 10.5, and 8.5 for boys, men, and older men. In conclusion, ST was not consistently higher at older ages. Instead, we found that the potential critical moments in which ST may be higher are during adolescence and in the transition from adulthood into older adulthood, which represents critical periods for interventions.  相似文献   

Do judges enhance home advantage in European championship boxing?     

NJ Balmer  AM Nevill  AM Lane 《Journal of sports sciences》2013,31(4):409-416

There have been many examples of contentious points decisions in boxing. Professional boxing is scored subjectively by judges and referees scoring each round of the contest. We assessed whether the probability of a home win (and therefore home advantage) increased when bouts were decided by points decisions rather than knockouts. Overall, we found that bouts ending in points decisions had a significantly higher proportion of home wins than those decided by a knockout, though this effect varied across time, and controlling for relative quality of boxers was only effective when using more recent data. Focusing on these data, again the probability of a home win was higher with a points decision and this effect was consistent as “relative quality” varied. For equally matched boxers (“relative quality” = 0), expected probability of a home win was 0.57 for knockouts, 0.66 for technical knockouts and 0.74 for points decisions. The results of the present study lend general support to the notion that home advantage is more prevalent in sports that involve subjective decision-making. We suggest that interventions should be designed to inform judges to counter home advantage effects.  相似文献   

Physical activity and school recess time: Differences between the sexes and the relationship between children's playground physical activity and habitual physical activity     

Jorge Mota  Pedro Silva  Maria Paula Santos  José Carlos Ribeiro  José Oliveira  José A Duarte 《Journal of sports sciences》2013,31(3):269-275

The aims of this study were: (1) to observe participation in moderate-to-vigorous physical activity (MVPA) during school recess periods; (2) to determine the relative importance of physical activity during recesses to overall daily physical activity; and (3) to examine differences in physical activity between the sexes during unstructured recess periods. The participants were 22 school children (10 boys, 12 girls) aged 8?–?10 years (mean = 8.9, s = 0.7) in the third and fourth grades. Daily totals for the physical activity variables were calculated by summing the values for each hour of 14?h of physical activity measurements (08:00 to 22:00?h). Recess times (minutes) were as follows: morning 10:30 to 11:00?h and afternoon 15:30 to 16:00?h. We did not differences between boys and girls in daily total accelerometer counts or the overall time spent in MVPA. However, girls were significantly (P <?0.05) more involved (38%) in MVPA during recess time than boys (31%). Participation in MVPA during recess contributes significantly more (P <?0.05) for girls (19%) than boys (15%) to the total amount of physical activity suggested by international health-related physical activity guidelines, while the percentage of time engaged in MVPA during recess time at school accounts for a small amount of the daily MVPA (6% for boys and 8% for girls). The results of this study suggest that school recess time is an important setting to promote MVPA and contributes to daily physical activity in young children, especially in girls.  相似文献   

Effects of replica running shoes upon external forces and muscle activity during running     

Ana Paula Da Silva Azevedo  Kátia Brandina  Roberto Bianco  Vitor Henrique De Oliveira  Juliana Roque De Souza  Bruno Mezencio 《Journal of sports sciences》2013,31(9):929-935

Abstract

Twelve participants ran (9 km · h^?1) to test two types of running shoes: replica and original shoes. Ground reaction force, plantar pressure and electromyographic activity were recorded. The shoes were tested randomly and on different days. Comparisons between the two experimental conditions were made by analysis of variance (ANOVA) test (P ≤ 0.05). The time to first peak, loading rate of the first peak and impulse of the first 75 ms of stance were significantly different between the shoes (P ≤ 0.05), revealing an increase of impact forces for the replica shoes. The peak plantar pressure values were significantly higher (P ≤ 0.05) when wearing replica shoes. During running, the contact area was significantly smaller (P ≤ 0.05) for the replica shoe. The electromyographic activity of the analysed muscles did not show changes between the two shoes in running. These findings suggest that the use of replica running shoes can increase the external load applied to the human body, but may not change the muscle activity pattern during locomotion. This new mechanical situation may increase the risk of injuries in these movements.  相似文献   

Microbial technology: Some social and intercultural implications in development     

Edgar J. Da Silva 《Int J Intercult Relat》1984,8(4):413-432

This contribution deals with the interrelationships of microbial technology, culture, and society especially since such technology is expected to contribute to national and global development in the coming decades. In harnessing the beneficial activities of microbes for national development, a number of factors, some social, others cultural, are encountered in either the acceptance or rejection of such technology by different peoples. Specific examples are cited, particularly with the development of technologies for the developing world in the food and energy sectors. Attention is also given to the role of women and to the use of resources that are acceptable to some communities and unacceptable to others due to prevailing sociocultural traits. Recognition of the different aids and barriers in development involves an understanding of the existing social and intercultural factors and their implications.  相似文献   

The effect of academic self-concept on ADHD and antisocial behaviors in early adolescence     

Pisecco S  Wristers K  Swank P  Silva PA  Baker DB 《Journal of learning disabilities》2001,34(5):450-461

Using structural equation modeling techniques, we evaluated the effect of academic self-concept (ASC) on the development of attention-deficit/hyperactivity disorder (ADHD) and antisocial behaviors in early adolescence. Participants (n = 445) were recruited from the Dunedin Multidisciplinary Health and Development Research study. Eligibility was determined by the presence of complete data for the following variables at the specified time periods: reading at age 7, teacher reports of ADHD and antisocial behaviors at age 7, self-ratings of ASC at ages 9 and 11, and teacher reports of ADHD and antisocial behaviors at age 13. The results indicated that ASC is an important construct that directly contributes to the development of antisocial behaviors rather than to symptoms of ADHD. The results also indicated that children's early history of behavioral problems and academic performance contribute to the development of a more robust understanding of the impact of ASC on the development of disruptive behaviors in early adolescence.  相似文献   

Combining Operations Management and Information Systems Curricula: Assessing Alumni Preparations for the Workforce     

David Silva  Kathleen L. McFadden 《Decision Sciences Journal of Innovative Education》2005,3(2):307-321

The purpose of this study is to explore how well a curriculum that combines operations management and information systems uniquely prepares students for the workforce. To address our research questions, a Web‐based survey was developed. We sent our survey to 203 alumni that graduated from the Department of Operations Management and Information Systems at Northern Illinois University. We assess alumni perceptions of how well our department prepared them in general and technical skills as well as how important these skills were in their current position. We investigate factors useful in predicting preparedness for both general business and technical skills. Overall, students felt prepared in most of the important skills we studied. We also found a significant positive relationship between alumni‐perceived importance of general and technical skills and perceived preparedness for those skills. More recent graduates felt the most prepared for both general business and technical skills. Our findings highlight the importance of general skills for future advancement and caution educators against overemphasizing currently popular technical tools at the expense of teaching the more general business skills. Results presented here provide new knowledge for curriculum designers at the intended institution and lessons for other schools. This research also provides a methodology or process that can be repeated at other institutions that combine information systems with operations management, or with other functions such as decision sciences or accounting. An implication of the results is that schools redesigning their programs may want to consider a curriculum that combines operations management and information systems.  相似文献   

Website replica detection with distant supervision     

Cristiano?Carvalho  Edleno?Silva?de?Moura  Adriano?VelosoEmail author  Nivio?Ziviani 《Information Retrieval》2018,21(4):253-272

Duplicate content on the Web occurs within the same website or across multiple websites. The latter is mainly associated with the existence of website replicas—sites that are perceptibly similar. Replication may be accidental, intentional or malicious, but no matter the reason, search engines suffer greatly either from unnecessarily storing and moving duplicate data, or from providing search results that do not offer real value to the users. In this paper, we model the detection of website replicas as a pairwise classification problem with distant supervision. That is, (heuristically) finding obvious replica and non-replica cases is trivial, but learning effective classifiers requires a representative set of non-obvious labeled examples, which are hard to obtain. We employ efficient Expectation-Maximization (EM) algorithms in order to find non-obvious examples from obvious ones, enlarging the training-set and improving the classifiers iteratively. Our classifiers employ association rules, being thus incrementally updated as the EM process iterates, making our algorithms time-efficient. Experiments show that: (1) replicas are fully eliminated at a false-positive rate lower than 0.005, incurring in + 19% reduction in the number of duplicate URLs, (2) reduction increases to + 21% by using our site-level algorithms in conjunction with existing URL-level algorithms, and (3) our classifiers are more than two orders of magnitude faster than semi-supervised alternative solutions.  相似文献