Does modality matter? A latent profile and transition analysis of sedentary behaviours among school-aged youth: The UP&DOWN study     

David Sánchez-Oliva  Rebecca M. Leech  Alberto Grao-Cruces  Irene Esteban-Cornejo  Carmen Padilla-Moledo  Oscar L. Veiga 《Journal of sports sciences》2020,38(9):1062-1069

ABSTRACT

The aims of this study were to identify profiles of sedentary behaviour (SB) patterns, based on leisure-time self-reported SB modalities (screen, educative, social, and relaxing) and to evaluate changes in these profiles over 2 years among Spanish youth aged 8–18 years. Latent profile analysis (LPA), a data-driven analytic approach, was used to identify groups of boys and girls (n = 1553; 48% girls; mean±SD age: 12.56 ± 2.49 y) with distinct SB profiles using the SB modalities (time/d) as input variables. Latent transition analysis, an extension of LPA that uses longitudinal data, was used to analyse 2-year changes in these profiles. At baseline, four and three SB profiles were found among boys (labelled: screen, educative, social, and relaxing) and girls (labelled: screen/social, educative, and relaxing), respectively. Overall, more girls (range: 48%-67%) had the same profile over time, than boys (40%-52%). Participants with a screen or relaxing SB profile at baseline were more likely to have an educative profile after 2 years. Youth with a social and an educative SB profile at baseline were more likely to transition to profiles characterized by higher screen and social SB, respectively. Using a novel and person-centered approach, this study identified gender-specific SB profiles that were moderately stable over time.  相似文献   

Quality flaw prediction in Spanish Wikipedia: A case of study with verifiability flaws     

Edgardo Ferretti  Leticia Cagnina  Viviana Paiz  Sebastián Delle Donne  Rodrigo Zacagnini  Marcelo Errecalde 《Information processing & management》2018,54(6):1169-1181

In this work, we present the first quality flaw prediction study for articles containing the two most frequent verifiability flaws in Spanish Wikipedia: articles which do not cite any references or sources at all (denominated Unreferenced) and articles that need additional citations for verification (so-called Refimprove). Based on the underlying characteristics of each flaw, different state-of-the-art approaches were evaluated. For articles not citing any references, a well-established rule-based approach was evaluated and interesting findings show that some of them suffer from Refimprove flaw instead. Likewise, for articles that need additional citations for verification, the well-known PU learning and one-class classification approaches were evaluated. Besides, new methods were compared and a new feature was also proposed to model this latter flaw. The results showed that new methods such as under-bagged decision trees with sum or majority voting rules, biased-SVM, and centroid-based balanced SVM, perform best in comparison with the ones previously published.  相似文献   

TAM and stages of adoption of blended learning in higher education by application of data mining techniques     

Antonio Víctor Martín-García  Fernando Martínez-Abad  David Reyes-González 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(5):2484-2500

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文献检索课网络化考核初探   总被引：1，自引：0，他引：1  

甄旭  张宇宏  季全芝 《现代图书情报技术》2003,(Z1)

通过对文献检索课考核方法的分析 ,提出网络化考核的模式 ,对所研制开发的“科技文献检索课考试管理系统”的技术实现及系统功能进行介绍  相似文献   

略论谭嗣同的人格特质     

刘纪荣  王莉娟 《贵阳金筑大学学报》2003,(3)

谭嗣同特殊的家庭生活、丰富的社会阅历、良好的学识修养以及深刻的思想言行,展示了谭氏的恢弘气度、过人胆 略、顽强意志、强烈使命感、深厚同情心以及旺盛求知俗等主要人格特质。  相似文献   

邢傲伟跳马侧手翻直体侧空翻转体810°的运动学分析   总被引：7，自引：3，他引：4  

姚侠文  李吉  李翠玲  于晖  李伟 《北京体育大学学报》2004,27(3):402-404

通过运动学等研究方法,揭示了我国优秀运动员邢傲伟完成的跳马侧手翻直体侧空翻转体810°的运动学规律与技术特点,对于进一步发展笠松类高难动作,提高我国男女跳马技术水平有促进作用.  相似文献   

新课程设置模式下,我校滑冰课教学实践研究   总被引：1，自引：1，他引：0  

马成顺  纪烈维 《冰雪运动》2004,(6):28-30

结合我校冬季体育课设置新模式,通过对我校滑冰课教学的实践研究,论证冬季北方高校体育课程设置的科学性、实用性,为高校体育课程改革提供理论依据.  相似文献   

影响我国少年跳高运动员成绩的技术因素分析及训练对策     

罗旭  章碧玉  管继春 《北京体育大学学报》2004,27(3):399-401

采用三维摄像法对影响我国16～17岁少年男女跳高运动员成绩获得的各技术因素的运动学分析,指出了我国优秀少年跳高运动员技术水平现状和存在的问题,并提出了发展对策.  相似文献   

Introduction: Scientific and Technological Textbooks in the European Periphery     

José Ramón Bertomeu-sánchez  Antonio García-Belmar  Anders Lundgren  Manolis Patiniotis 《Science & Education》2006,15(7-8):657-665

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加入世贸组织对我国体育中介市场发展的影响   总被引：3，自引：0，他引：3  

楚继军  谭建湘 《广州体育学院学报》2004,24(1):4-7

通过对与体育中介经营相关的WTO规则的深层分析，多方面探讨了加入WTO对我国体育中介市场发展的影响因素，提出了体育中介组织应对国际化竞争挑战和经营发展中应注意的主要问题。  相似文献