共享经济可持续性评价：社会感知与客观绩效     

董晓松  霍依凡  赵星 《科研管理》2023,44(1):79-88

共享经济行业可持续性评价的社会感知和客观绩效不一致将造成认知错位、投资误判和政策失效等结果。本文在线挖掘2017—2019年我国主要社交媒体上29 771条文本信息，并收集行业统计数据，综合测度共享经济行业的可持续性并比较其差异。研究发现：社会公众并不认为共享经济行业具有显著的总体可持续性，而且行业实际绩效展现的可持续性与社会大众认知截然不同。进一步发现：受限于主观认知能力，社会公众认为共享经济可持续性主要来自可观察到的行业外部经济和外部生态等维度，但客观绩效表明共享经济行业内部的经济和外部的技术优势才是其可持续性的重要支撑。此外，二者评价的差异在住宿与医疗等产能共享内部过程不易被大众观察的行业中最为突出。  相似文献   

Where do you come from,where do you go? Assessing skills gaps and labour market outcomes for young adults with different immigration backgrounds     

《International Journal of Educational Development》2021

Using PISA and PIAAC data from twelve OECD countries, we examine the gap in cognitive skills among immigrants and natives and evaluate how those differences have evolved over time. We also consider how demographics, family background and school quality explain the development of cognitive skills of young people with immigrant backgrounds. The results show, first, that some convergence in skills occurs between second-generation immigrants and natives over time. Second, demographics, family background and school quality variables all contribute to the achievement gaps across different groups.  相似文献   

花样游泳运动员功能性动作能力与力量素质的相关性研究     

陈文佳  章碧玉  沈兆喆 《中国体育科技》2020,(2):71-80,F0003

目的:探讨我国优秀花样游泳运动员功能性动作能力与力量素质的相关性,分析功能动作筛查测试与力量素质测试结果存在的内在联系,从专项视角探讨花样游泳运动项目的训练策略并提出建议。方法:选取国家花样游泳队14名健将级运动员为研究对象,对其进行FMS、握力、上肢力量、股内收肌群力量、躯干核心耐力、下肢爆发力测试,并对测试结果进行相关性分析。结果:1)14名花样游泳运动员FMS测试平均得分为15.21分,有5人测试得分低于运动损伤高风险的临界值(14分);2)FMS测试总分与Keiser坐姿上推(偏相关系数=0.622,P<0.05)、45°股内收肌群横向收缩力量(偏相关系数=0.652,P<0.05)、90°股内收肌群横向收缩力量(偏相关系数=0.746,P<0.01)均呈正相关;3)直线弓步蹲与Keiser坐姿上推(偏相关系数=0.711,P<0.05)、无反向纵跳(偏相关系数=0.661,P<0.05)、有反向纵跳(偏相关系数=0.614,P<0.05)和40 cm跳深跳高(偏相关系数=0.754,P<0.01)均呈正相关;肩部灵活性测试得分与Keiser下蹲上推(偏相关系数=0.575,P<0.05)、45°股内收肌群横向收缩力量(偏相关系数=0.585,P<0.05)以及90°股内收肌群横向收缩力量(r=0.867,P<0.01)均呈正相关,与仰桥耐力呈负相关(偏相关系数=0.701,P<0.05);旋转稳定性与40 cm跳深跳高呈正相关(偏相关系数=0.575,P<0.05)。结论:我国优秀花样游泳运动员髋关节主动灵活性和臀大肌-髂胫束联合等肌群的主动柔韧性较好,但存在膝关节、髋关节稳定性差、躯干核心区肌群控制力不足等问题,受主导臂和主导腿均为右侧影响,运动员身体两侧不平衡明显。运动员FMS测试得分并不能全面反映其力量素质的高低,FMS测试得分与部分力量素质测试结果存在相关性,可能与两种测试均涉及同一动力链结构系统肌群的协同工作和动作存在做功类型的相似性有关。  相似文献   

New curve sprint test for soccer players: Reliability and relationship with linear sprint     

Alberto Fílter  Jesús Olivares  Alfredo Santalla  Fabio Y. Nakamura  Irineu Loturco  Bernardo Requena 《Journal of sports sciences》2020,38(11-12):1320-1325

ABSTRACT

The speed performance is involved not only in linear sprints, but also in a wide spectrum of multi-directional movements, such as curve sprinting. Curved sprint can be defined as sprint with gradual and continuous change of direction (COD). Although ~85% of the actions performed at maximum velocity in a professional soccer league are curvilinear sprints, there is not any specific test to assess this ability. This study aimed to analyse the reliability of a new curve sprint test, and compare its results with those obtained by soccer players in linear sprint. Forty experienced soccer players performed 3 attempts of curve sprint (using the penalty arc) to right and left side (17 m), and 3 linear sprints (17 m) in two different days. The ICCs (inter-session reliability) were 0.93 for sprint curve right side (CSRS) and 0.89 for sprint curve left side (CSLS), considered “acceptable”. The CVs (intra-session reliability) were 0.87% in CSRS and 1.15% in CSLS. The coefficient of determination (R²) between linear and curve sprinting was ~35%. The association between curve sides was “very large” (r = 0.878; p < 0.01). In summary, we showed that “curve sprint test” is highly reliable, and that curvilinear and linear sprints are different and independent actions.  相似文献   

面向幼儿发展的表现性评价实践研究     

张蕊 《科教文汇》2020,(13):151-152

本研究采用表现性评价,对x幼儿园大班一个班级39名幼儿进行为期一年的发展性评价,在真实情境中对幼儿的发展状况作出连续性评价,获悉幼儿不同阶段的发展状况,同时对评价过程进行总结和反思。  相似文献   

A Web-Based Virtual Microscopy Platform for Improving Academic Performance in Histology and Pathology Laboratory Courses: A Pilot Study     

Bai-Chin Lee  Sung-Tsang Hsieh  Yih-Leong Chang  Fen-Yu Tseng  Yu-Jung Lin  Yuh-Lien Chen  Shu-Huei Wang  Yu-Fong Chang  Yi-Lwun Ho  Yen-Hsuan Ni  Shan-Chwen Chang 《Anatomical sciences education》2020,13(6):743-758

Virtual microscopy (VM) has been utilized to improve students' learning experience in microscope laboratory sessions, but minimal attention has been given to determining how to use VM more effectively. The study examined the influence of VM on academic performance and teacher and student perceptions and compared laboratory test scores before and after VM incorporation. A total of 662 third-year students studying histology and 651 fourth-year students studying pathology were divided into two groups. The light microscopy (LM) group used a light microscope in 2014 and 2015, while the LM + VM group used the VM platform and a light microscope in 2016 and 2017. Four factors positively predict laboratory scores (R square, 0.323; P < 0.001): (i) the pathology course and test-enhanced learning, (ii) the VM platform and experience, (iii) medical students and lecture scores, and (iv) female students. The LM + VM group exhibited less score variability on laboratory examinations relative to their mean than the LM group. The LM + VM group was also associated with fewer failing grades (F grade; odds ratio, 0.336; P < 0.001) and higher scores (A grade; odds ratio, 2.084; P < 0.001) after controlling for sex, school, course, and lecture grades. The positive effect of the VM platform on laboratory test grades was associated with prior experience using the VM platform and was synergistic with more interim tests. Both teachers and students agreed that the VM platform enhanced laboratory learning. The incorporation of the VM platform in the context of test-enhanced learning may help more students to master microscopic laboratory content.  相似文献   

创新网络与企业技术创新动态能力协同演进研究——基于系统动力学的分析_*     

王昌林 《科技管理研究》2018,(21)

本研究利用系统动力学方法,从知识流动的角度描述、量化、模拟企业创新网络与企业技术创新动态能力协同演进的过程。模型分析结果表明当前企业创新绩效取决于技术创新动态能力与创新网络协同演进路径：技术创新动态能力→创新网络构建与演化→外部知识内化→创新绩效→技术创新动态能力。在协同演进的过程中随着企业技术创新的发展,在创新绩效驱动三要素中,动态能力以及创新网络知识内化对创新绩效提升具有边际递增的效应,同时创新战略、产业政策平台和管理平台对企业技术创新都存在显著影响,但这种影响作用存在较大差异。  相似文献   

校企合作与高校科研绩效：高校类型的调节作用          下载免费PDF全文

王晓红  张奔 《科研管理》2018,39(2):135-142

本文利用2007-2014年我国88所高校的面板数据，采用系统广义矩（Sys-GMM）模型方法，实证研究了校企合作活动对我国高校科研绩效的影响，以及高校类型的调节作用。研究结果表明：（1）校企合作对高校科研绩效的影响呈倒U型；（2）高校类型对校企合作与高校科研绩效之间的倒U型曲线关系具有显著的负向调节作用。本研究不仅丰富了产学研合作理论，同时对高校制定及完善校企合作政策提供了理论参考。  相似文献   

产学研协同创新绩效测度现状及方法改进     

郝向举  薛琳 《科技管理研究》2018,(11)

引入模糊集定性比较分析(fuzzy-set qualitative comparative analysis,fsQCA)进行产学研协同创新绩效研究,改进基于对称性假设进行绩效测度的方法。理论分析和实证结果表明,改进后的测度方法可行而且易用,其优点在于采用条件集合和绩效之间的映射关系表征结果,不但能够进行数值大小的比较,而且其路径分析还有助于发现提升绩效的途径。  相似文献   

视觉运动追踪及其在体育运动中的应用与启示     

刘洋  漆昌柱  秦杰 《武汉体育学院学报》2018,52(8):78-84

运动员的视觉运动追踪能力是众多运动项目获得优异比赛成绩的关键因素，也是近些年运动心理学研究的重要问题。运用文献综述法对国内外关于视觉运动追踪的基本理论、研究范式及其在体育运动中的应用进行剖析，总结以往研究所取得的成果和存在的不足，探讨视觉运动追踪研究对体育运动成绩的影响与启示，为后续相关研究提供一定的思路与方法借鉴，为运动员心理选材及心理技能训练方法与策略提供理论参考和实证依据。  相似文献