身体关怀:徐英超体质教育思想的形成动因、内在逻辑与当代启示     

邵天逸  李启迪 《沈阳体育学院学报》2020,(3):23-28

徐英超是"体质教育思想"的首创者,这一思想在我国学校体育发展史中具有重要的地位。运用文献资料法、逻辑分析法,通过不同的视角深度剖析徐英超体质教育思想,旨在呈现徐英超体质教育思想的形成动因与内在逻辑,并挖掘体质教育思想对当前学校体育的启示。研究认为徐英超体质教育思想的成因在于反思体育的概念,内在逻辑包含3个方面:体育教学的视点应从技术传习回归身体教育,实证调研是揭示与掌握体质变化规律的关键,良好的心态与生活方式是促进体质健康的外部保障。徐英超体质教育思想的当代启示:正视增强体质与技术教学之关系;参考体测结果调整体育教学方向;建构面向生活的体育健康教育观。  相似文献   

RGAN-EL: A GAN and ensemble learning-based hybrid approach for imbalanced data classification     

《Information processing & management》2023,60(2):103235

Imbalanced sample distribution is usually the main reason for the performance degradation of machine learning algorithms. Based on this, this study proposes a hybrid framework (RGAN-EL) combining generative adversarial networks and ensemble learning method to improve the classification performance of imbalanced data. Firstly, we propose a training sample selection strategy based on roulette wheel selection method to make GAN pay more attention to the class overlapping area when fitting the sample distribution. Secondly, we design two kinds of generator training loss, and propose a noise sample filtering method to improve the quality of generated samples. Then, minority class samples are oversampled using the improved RGAN to obtain a balanced training sample set. Finally, combined with the ensemble learning strategy, the final training and prediction are carried out. We conducted experiments on 41 real imbalanced data sets using two evaluation indexes: F1-score and AUC. Specifically, we compare RGAN-EL with six typical ensemble learning; RGAN is compared with three typical GAN models. The experimental results show that RGAN-EL is significantly better than the other six ensemble learning methods, and RGAN is greatly improved compared with three classical GAN models.  相似文献   

Creating value from Social Big Data: Implications for Smart Tourism Destinations     

Pasquale Del Vecchio  Gioconda Mele  Valentina Ndou  Giustina Secundo 《Information processing & management》2018,54(5):847-860

This paper aims to demonstrate how the huge amount of Social Big Data available from tourists can nurture the value creation process for a Smart Tourism Destination. Applying a multiple-case study analysis, the paper explores a set of regional tourist experiences related to a Southern European region and destination, to derive patterns and opportunities of value creation generated by Big Data in tourism. Findings present and discuss evidence in terms of improving decision-making, creating marketing strategies with more personalized offerings, transparency and trust in dialogue with customers and stakeholders, and emergence of new business models. Finally, implications are presented for researchers and practitioners interested in the managerial exploitation of Big Data in the context of information-intensive industries and mainly in Tourism.  相似文献   

Gratitude for teachers as a psychological resource for early adolescents: A mixed-methods study     

Indrawati Liauw  Rebecca N. Baelen  Robert F. Borah  Alisa Yu  Anne Colby 《Journal of moral education》2018,47(4):397-414

In this mixed-methods study, we examine students’ gratitude for their teachers and the implications of that gratitude for their psychological adaptation. We report findings that gratitude for teachers (GT) is, in fact, a resource for students facing difficult circumstances outside school. More specifically, our hierarchical multiple regression models demonstrate that this form of gratitude decreases the negative association between adverse life events and students’ life satisfaction. GT also decreases the positive association between negative life events and students’ perceived stress. Then, we use coded material from student interviews to illustrate how they understand the ways that their GT helps them manage challenges in their personal lives. We conclude that students’ GT buffers the negative impact of adverse life events, because it helps students attend to the positive interactions and mentorship they have with their teachers and maintain focus on their future-oriented goals.  相似文献   

不同负荷运动训练对大鼠骨骼肌线粒体三羧酸循环的影响及其机制研究     

李洁  杨静  赵丽丽 《武汉体育学院学报》2019,53(5):88-94

目的：探讨不同负荷运动训练对大鼠骨骼肌线粒体三羧酸循环的影响及其机制。方法：将雄性Wistar大鼠50只随机均分为5组：安静对照组（C）、低负荷运动训练组（LT）、中等负荷运动训练组（MT）、高负荷运动训练组（HT）和极高负荷运动训练组（ST），每组10只。各运动组分别进行6周的跑台运动训练。训练方案结束后，取腓肠肌样本，提取线粒体，测定线粒体柠檬酸合成酶（CS）、异柠檬酸脱氢酶（ICD）和α-酮戊二酸脱氢酶（α-KGDHC）活性；线粒体Ga²⁺含量、胞浆NADH、NAD⁺、ATP和ADP含量，以及ICD mRNA转录水平。结果：（1）不同负荷运动训练组线粒体CS、ICD和α-KGDHC的活性均显著高于安静对照组（P < 0.01），且CS和ICD活性由高到低顺序均为：MT组 > HT组 > ST组 > LT组 > C组，α-KGDHC活性由高到低顺序为：HT组 > MT组 > ST组 > LT组 > C组。（2）不同负荷运动训练组线粒体Ca²⁺ 含量均显著高于安静对照组（P < 0.01），其含量由高到低顺序为：MT组 > HT组 > ST组 > LT组 > C组；胞浆NADH/NAD⁺和ATP/ADP的比值均显著低于安静对照组（P < 0.01），其比值由低到高顺序为：MT组 < ST组 < HT组 < LT组 < C组。（3）不同负荷运动训练组ICD mRNA转录水平均高于安静对照组（P < 0.01），其水平由高到低顺序为： MT组 > HT组 > ST组 > LT组 > C组。结论：低负荷、中等负荷、高负荷及极高负荷运动训练均可提高大鼠骨骼肌线粒体三羧酸循环功能，且中等负荷运动训练效果最佳。其机制与胞浆NADH/NAD⁺和ATP/ADP比值、线粒体摄钙能力及限速酶基因的表达有关。  相似文献   

Biomechanical differences of arm swing countermovement jumps on sand and rigid surface performed by elite beach volleyball players     

George Giatsis  Vassilios Panoutsakopoulos  Iraklis A. Kollias 《Journal of sports sciences》2018,36(9):997-1008

The purpose of this study was to investigate the possible arm swing effect on the biomechanical parameters of vertical counter movement jump due to differences of the compliance of the take-off surface. Fifteen elite male beach-volleyball players (26.2 ± 5.9 years; 1.87 ± 0.05 m; 83.4 ± 6.0 kg; mean ± standard deviation, respectively) performed counter movement jumps on sand and on a rigid surface with and without an arm swing. Results showed significant (p < .05) surface effects on the jump height, the ankle joint angle at the lowest height of the body center of mass and the ankle angular velocity. Also, significant arm swing effects were found on jump height, maximum power output, temporal parameters, range of motion and angular velocity of the hip. These findings could be attributed to the instability of the sand, which resulted in reduced peak power output due to the differences of body configuration at the lowest body position and lower limb joints’ range of motion. The combined effect of the backward arm swing and the recoil of the sand that resulted in decreased resistance at ankle plantar flexion should be controlled at the preparation of selected jumping tasks in beach-volleyball.  相似文献   

Search tactics used in solving everyday how-to technical tasks: Repertoire,selection and tenacity     

Sophie Rutter  Verena Blinzler  Chaoyu Ye  Max L. Wilson  Michael D. Twidale 《Information processing & management》2019,56(3):919-938

With greater access to computational resources, people use search to address many everyday challenges in their lives, including solving technology problems. Although there are now many useful ‘how-to’ resources online (especially videos on YouTube), it can still be difficult to identify, understand, and resolve certain kinds of technical problem. While research tasks have been studied for many years and we know the tactics people use, we know far less about searchers’ tactics for how-to technical tasks that involve actually being able to apply found information to resolve a problem. Crucial to our study was developing and studying a highly realistic, how-to technical task, for which there was no single guidance resource: making a phone safe for a child. After providing 39 participants with an actual phone to fix, and a search engine to perform the task, we analysed their search tactics using retrospective cued think aloud interviews. Our primary contribution is a set of 77 tactics used, in three categories, along with detail of how common they were. We conclude that people had a lot of tactics in their repertoire. Although it was not hard for participants to find relevant information, what was hard was for participants to find information they could use; indeed only 23% of participants successfully completed the entire task. Domain knowledge affected the choice of tactics used (although not necessarily towards better task success). We discuss these influences and make design recommendations for how future search systems can support those in resolving how-to technical tasks.  相似文献   

数据论文联合出版模式及数据论文出版     

马瀚青  杨小梅  侯春梅  李晓燕  李红星 《中国科技期刊研究》2018,29(7):698-703

【目的】 分析期刊编辑部与数据中心联合出版数据论文的模式，为进一步推进数据论文出版提供参考。【方法】 借鉴国际数据期刊论文出版模式，建立了期刊编辑部与数据中心联合出版数据论文的模式和流程，并分析了数据论文出版实践工作取得的成效和发展方向。【结果】 以期刊编辑部为主体，通过与数据中心联合，探索数据论文出版的流程，实现了数据论文的出版。【结论】 数据论文出版是一种新型论文形式，是对科学数据的肯定，能有效提高期刊的影响力。  相似文献   

Remaining in Control with an Illusion of Interactivity: The Paternalistic Side of Data Journalism*     

Ester Appelgren 《Journalism Practice》2019,13(8):956-960

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基于高纬稀疏数据分析的制造型企业研发投入对企业绩效的影响分析     

王勇  金涛 《科技管理研究》2018,(21)

国内外学者对科研投入与企业绩效之间的关系进行了大量研究和实证工作，现有研究多以定性研究为主，分析研发投入与企业绩效之间的关系以及影响这两者关系的直接和间接变量，有少量学者用定量分析的方法表达某个或者某几个变量与这两者关系之间的数学关系，但由于企业绩效及科研成果结果显现的影响变量太多，这种定量分析方法的局限性大。为探索一种对大量因素同时进行定量分析的方法，尝试采用对高纬稀疏数据进行分析，对沪深两市327家制造企业2011~2016年的数据进行分析，以“研发投入增长率>0 & 营业收入增长率>0 & 人均营业收入增长率>0”为分析目标，对影响目标实现的十类74个变量进行定量分析，并得到达到这一分析目标的定量优化规则：当期和上期单位研发人员研发投入、研发人员投入增长率、盈利能力、产品市场竞争度这五个变量处于一定范围内时，分析目标达成概率有较大幅度提升。这一分析结果既可以用于衡量企业研发水平是否达到规模边界，又可作为对企业研发投入行为对企业绩效结果的预判。  相似文献