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

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.     

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

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prediction study for articles containing the two most frequent verifiability flaws in Spanish Wikipedia: articles which do not cite any references or sources at all (denominated Unreferenced) and articles that need additional citations for verification (so-called Refimprove).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.     

学习团队协作信息搜索的共享心智模型研究

[目的/意义] 对协作信息搜索进行深入研究，为专业化协作信息搜索系统平台建设优化等提供启发和借鉴。[方法/过程] 聚焦于学习团队的信息搜索行为，以高校学生为研究样本，以共享心智模型为切入点，采用扎根理论研究方法，探讨协作信息搜索中团队共享心智模型建构过程。[结果/结论] 识别出四大核心环节——个体感知与探索、团队任务解析、团队信息收集和团队信息整合，并理清各环节的认知活动与共享心智模型内容要素。     

Recording the war effort: immigrant communities in Latin America and the memory of the Great War

ABSTRACT

This paper aims to analyse the initiatives undertaken by some immigrant communities residing in Latin America to record their mobilisation around the First World War. After the armistice, European communities in Argentina, Bolivia, Brazil, Chile, Mexico, Paraguay, Peru, Uruguay and other countries gathered detailed information about their activities during the conflict, published as profusely illustrated books of remembrance, offered to their governments as proof of their loyalty. The article intends to establish the peculiar nature of these publications as records of the war effort, and analyse the agents and processes of their elaboration, and their role as commemorative but also as archival documents.     

充分发挥档案在高校工作中的作用

学校档案全宗是高校的宝贵财富,它为学校领导决策服务、为广大教职工从事学校管理、教学科研等工作提供可靠的依据和参考。因此,只有了解和掌握档案利用者的需求特点,规范档案管理,充分挖掘档案信息资源,提高档案工作者的素质,才能高效发挥档案在高校工作中的作用。     

跨国企业集团面临的汇率风险及其规避

入世后，我国的市场适步向国际开放，我国企业也在不断走向国际市场。国际交易的频繁发生，不可避免地会对跨国企业集团产生一些影响。其中，汇率风险对任何跨国企业来说，都是一个不可避免的问题。那么，就目前而言，跨国企业面临的风险有哪些，如何去规避或降低这些风险，笔者就此作一些简单的分析，供大家参考。     

大学生运动休闲文化探析

从运动休闲概念的释义入手，以文献资料为基础，从社会学与文化学的角度，就大学生运动休闲文化的形成、内容、形式及其延伸等方面进行了阐释。     

大学体育与社会群众体育的比较研究

为比较大学体育与社会群众体育的异同 ,对黑龙江省内外 9所大学的部分学生和省内主要城市厂矿、企事业单位、社区、街道等部分社会群众成员进行问卷调查、专访。并查阅有关图文资料 ,对大学体育与社会群众体育进行了比较研究。结果显示 :在大学体育和群众体育这两个领域内 ,由于在时间、空间、地域和人文环境上 ,学习、工作和生活条件的不同 ,以及所受教育的程度不同 ,对体育运动的参与能力、参加活动的时间、场所及组织形式上、对健身目的认识和体育消费结构上都存在明显的差异性。为进一步开展社会群众体育 ,建议政府主管部门加强对社会群众组织的投入 ,利用大学优势培养社会体育指导员 ;加强体育设施建设 ;大力宣传健康与体育的关系和体育的功能。