Introducing novel approaches for examining the variability of individuals’ physical activity     

Alex V. Rowlands  Sjaan R. Gomersall  Catrine Tudor-Locke  David R. Bassett  Minsoo Kang  François Fraysse 《Journal of sports sciences》2015,33(5):457-466

Tudor-Locke and colleagues previously assessed steps/day for 1 year. The aim of this study was to use this data set to introduce a novel approach for the investigation of whether individual’s physical activity exhibits periodicity fluctuating round a mean and, if so, the degree of fluctuation and whether the mean changes over time. Twenty-three participants wore a pedometer for 365 days, recorded steps/day and whether the day was a workday. Fourier transform of each participant’s daily steps data showed the physical activity had a periodicity of 7 days in half of the participants, matching the periodicity of the workday pattern. Activity level remained stable in half of the participants, decreased in ten participants and increased in two. In conclusion, the 7-day periodicity of activity in half of the participants and correspondence with the workday pattern suggest a social or environmental influence. The novel analytical approach introduced herein allows the determination of the periodicity of activity, the degree of variability in activity that is tolerated during day-to-day life and whether the activity level is stable. Results from the use of these methodologies in larger data sets may enable a more focused approach to the design of interventions that aim to increase activity.  相似文献   

大学生方程式赛车的发动机牵引力控制与弹射起步研究     

黎杰  冼锦恒  丁康  梁振辉  吴双龙 《中国教师》2015,(4):117-119

基于使FSC赛车能有最佳起步性能表现的目的,采用调节发动机的断油或断火,控制发动机的功率输出,从而控制目标滑移率和目标转速的方法,结合在多组测试数据的多次直线加速试验,得出通过实验数据选择的最优动力方案来限制引擎的功率输出(断油或断火),可以大大提高FSC赛车的起步性能的结论。  相似文献   

基于自适应学习理论的教学模式改革探析——以“食品标准与法规”课程教学改革为例     

潘磊庆  宋菲  屠康 《高教论坛》2015,(4)

基于自适应学习理论的定义和内涵,结合食品标准与法规课程教学存在的主要问题,对基于自适应学习理论的教学模式进行探析,提出以示例演练、情景探索、实践教学和数字资源建设和运用为组成部分,构建食品标准与法规课程的教学新模式,以提高教学质量和学生的专业能力.  相似文献   

Performance of a single-stage auto-cascade refrigerator operating with a rectifying column at the temperature level of-60℃     

Qin WANG  Kang CUI  Teng-fei SUN  Guang-ming CHEN 《浙江大学学报(A卷英文版)》2011,12(2)

  相似文献   

杜威教育思想跨时空传播与吸收的历史比较研究述评(1996～2012)     

赵康 《比较教育研究》2015,37(2):68-73

通过展现1996年～2012年间有关杜威教育思想在世界传播和吸收的研究状况,本文认为国外这类研究在理论视角和分析框架方面显出多样性,其方法论大多可用“外化”理论解释,方法上呈现为历史与比较分析结合的走势.这种结合为揭示与解释教育知识的跨文化传播与吸收过程及其“机制”提供了历史案例,并促成国际视野的建构.其研究案例有助于重新评价杜威在教育史上的地位,也有助于理解和借鉴“外化”理论以及历史与比较研究结合的取径.  相似文献   

论大学英语教学中的形成性评价     

康陆 《佳木斯教育学院学报》2015,(2)

教学评价是大学英语教学的一个重要环节,而形成性评价能发挥学生的主动性,为教与学提供及时、有效的反馈信息,有利于教和学过程的完善和发展。从形成性评价的概念入手,分析评价过程,通过与其他评价进行对比,阐述形成性评价的特点以及在实践中的应用。  相似文献   

新形势下加强民办高校党外代表人士选拔培养工作的思考     

亢莹 《佳木斯教育学院学报》2015,(5)

新形势下加强民办高校统战工作,探讨民办高校党外代表人士选拔培养工作规律与新途径,有着十分重要的现实意义。要针对民办高校发展的新形势、新问题和新特点,研究民办高校党外代表人士队伍建设路径,做好民办高校党外代表人士培养选拔工作,以开拓党外代表人士队伍建设新领域,推动民办高校党外代表人士充分发挥其优势作用。  相似文献   

Reexamining the Impact of Nonnormality in Two-Group Comparison Procedures     

Yoonjeong Kang  Ming Li 《Journal of Experimental Education》2015,83(2):147-174

The authors performed a Monte Carlo simulation to empirically investigate the robustness and power of 4 methods in testing mean differences for 2 independent groups under conditions in which 2 populations may not demonstrate the same pattern of nonnormality. The approaches considered were the t test, Wilcoxon rank-sum test, Welch-James test with trimmed means and Winsorized variances, and a nonparametric bootstrap test. Results showed that the Wilcoxon rank-sum test and Welch-James test with trimmed means and Winsorized variances were not robust in terms of type I error control when the 2 populations showed different patterns of nonnormality. The nonparametric bootstrap test provided power advantages over the t test. The authors discuss other results from the simulation study and provide recommendations.  相似文献   

A Classroom Exercise to Examine the Trade‐off between Mission Capacity and Life Cycle Cost          下载免费PDF全文

Keebom Kang  Kenneth H. Doerr 《Decision Sciences Journal of Innovative Education》2015,13(1):3-20

This article presents a classroom exercise, centered on a simulation that has been used for 4 years in an MBA program to help students develop an understanding of the trade‐offs involved in managing capital assets in the public sector. Though often ignored in business schools, mission is a key criterion that must be considered when managing such assets, and acts as a surrogate for profit. The case presents a rich environment in which the impact of cost reductions (or additional investments) on mission can be quantified, and trade‐offs can be assessed and discussed. It gives students a chance to develop creative ideas for process improvement, and provides sufficient data for them to analyze the impact of their suggestions in a rigorous way.  相似文献   

Cheating among elementary school children: A machine learning approach     

Li Zhao  Yi Zheng  Junbang Zhao  Guoqiang Li  Brian J. Compton  Rui Zhang  Fang Fang  Gail D. Heyman  Kang Lee 《Child development》2023,94(4):922-940

Academic cheating is common, but little is known about its early emergence. It was examined among Chinese second to sixth graders (N = 2094; 53% boys, collected between 2018 and 2019) using a machine learning approach. Overall, 25.74% reported having cheated, which was predicted by the best machine learning algorithm (Random Forest) at a mean accuracy of 81.43%. Cheating was most strongly predicted by children's beliefs about the acceptability of cheating and the observed prevalence and frequency of peer cheating at school. These findings provide important insights about the early development of academic cheating, and how to promote academic integrity and limit cheating before it becomes entrenched. The present research demonstrates that machine learning can be effectively used to analyze developmental data.  相似文献