基于BP神经网络的共享服务平台资源信息质量评价研究——以短租类共享服务平台为例     

李全喜  徐嘉徽  魏骏巍  张健 《图书情报工作》2019,63(10):125-133

[目的/意义] 以短租类共享服务平台为例，构建共享服务平台资源信息质量评价指标体系，帮助此类平台企业高效地识别出存在信息质量问题的资源，提高平台整体的信息质量水平。[方法/过程] 首先基于信息传播学相关理论，对共享服务平台信息传播过程进行总结。然后根据共享服务平台信息传播的参与主体和访谈原始资料分析，构建共享服务平台资源信息质量评价指标体系，分为信源质量、信息内容质量和信息效用质量三个维度。最后提出基于BP神经网络的信息质量评价方法，并使用Matlab2018a软件对采集的100组样本数据进行训练和仿真验证。[结果/结论] 提出共享服务平台资源信息质量评价指标体系，并以短租类共享服务平台为例运用BP神经网络进行验证，实验证明该评价指标体系具有一定的可行性和实用性。  相似文献   

近五年我国体育学研究热点领域及未来趋势     

李玉周  江崇民 《武汉体育学院学报》2019,53(4):19-25

为发现我国近五年体育学研究热点领域及其未来趋势，使用布拉德福定律分区理论，对体育学16种核心期刊2013-2017年所刊论文的关键词进行分层研究。通过关键词在核心区分布的整体和年度分析，结果发现：①整体分析，近5年体育学最热门的研究主题为：竞技体育、体育管理、群众体育、学校体育、体育教育、体育文化、体育史、民族传统体育、体育经济和体育产业；②年度分析，体育学研究热点随时间发生波动性变化；③体育学研究热点的三个层次：第一层次包括竞技体育、体育管理、群众体育和体育教育，是近年及未来体育学研究的重点；第二层次包括学校体育和体育史，学校体育的研究逐步得到重视；第三层次包括民族传统体育、体育文化、体育产业和奥运会；④研究热点随年份的变化：最重要热点竞技体育、体育管理、群众体育、体育教育表现出持续性和稳定性；次重要热点学校体育和体育史的变化表现出差异性，揭示了研究热点的未来趋势；边缘性热点民族传统体育、体育文化、体育产业和奥运会波动性大，偶然性明显。  相似文献   

When digitalized customers meet digitalized services: A digitalized social cognitive perspective of omnichannel service usage     

《International Journal of Information Management》2020

With the prevalence of digital technologies, various services have grown digitalized. Specific to the marketing section, multichannel has been gradually replaced by omnichannel, which aims to integrate all the physical and digital channels tightly. Although omnichannel has received considerable attention, there is still a dearth of research that theorizes the multi-faceted impacts of digitalization on omnichannel. This study thus extends social cognitive theory (SCT) to the digitalized context and contextualizes the digitalized customer and digitalized environment as mobile identity and channel integration quality, respectively. Moreover, based on the self-regulation process of human agency, we incorporate omnichannel self-efficacy, satisfaction, and habit as the agentic factors to interpret a customer’s conscious (ability and expectancy beliefs) and unconscious (automatic behavioral tendency) decision-making under the omnichannel setting. Through an online survey of 401 omnichannel customers, we find support for all the proposed hypotheses. Implications and limitations of this study are further discussed.  相似文献   

我国图书情报领域期刊论文的科学数据引用特征研究     

丁文姚  李健  韩毅 《图书情报工作》2019,63(22):118-128

[目的/意义] 探索期刊论文科学数据引用特征与规律不仅有助于描述学科领域对科学数据的利用情况，还能够揭示学术成果表达中的数据引用模式。[方法/过程] 以我国图书情报领域6种期刊2017年与2018年第一期刊载论文为样本，结合国家标准《信息技术科学数据引用》的引用元素，采用内容分析法从9个维度对样本论文的科学数据引用行为进行数据编码，应用统计学方法描述图书情报领域期刊论文科学数据引用特征并探索不同维度特征间的关联关系。[结果/结论] 图书情报领域期刊论文广泛引用来自国内外的统计整理类科学数据，对期刊论文中个人研究科学数据的引用量较大；科学数据引用标注方式与科学数据类型存在一定对应关系，但多样化的标注方式缺乏统一性；二手引用现象较为突出，二手引用程度与科学数据创建者类型相关。  相似文献   

社会体育指导员岗位素质应然与实然的调查研究     

李金花 《浙江体育科学》2020,(3):26-29

社会体育指导员作为社会体育发展的主要力量,提升自身的岗位素质成为社会体育指导员健身指导水平的保障。论文主要采用文献资料法、访谈法与问卷调查法,对社会体育指导员应有和实有的品质能力、技能能力、行为能力进行调查,研究认为,社会体育指导员的“应然”岗位素质均得到认可,而“实然”的岗位素质掌握程度不够理想,智能化设备使用能力成为短板,研究能为社会体育指导员在岗位上所应具备的岗位素质提供借鉴。  相似文献   

傣族与汉族中学生身体素质对比分析     

段桂香  王玉洪 《体育科技文献通报》2020,(2):133-135

为了掌握傣族与汉族中学生的身体素质现状,文章运用文献资料法、对比分析法、数理统计法等,对汉族与傣族中学生的速度素质、耐力素质、力量素质、柔韧素质进行对比分析,结果表明:在速度素质方面,汉族男生优于傣族男生,傣族女生则优于汉族女生;在耐力素质中方面,13岁这个年龄段傣族男女生均优于汉族男女生,14、15岁则汉族男女生优于傣族男女生;力量素质方面,傣族男女生总体上优于汉族男女生;柔韧素质方面,汉族男女生优于傣族男女生。  相似文献   

中小学兼职体育教师素养发展探究     

曹乐意  史兵 《湖北体育科技》2020,(1):83-87

当前是我国进一步推进素质教育发展、落实立德树人教育任务、提升学生身心健康水平的关键时期。为充分整合体育人才资源,提升兼职体育教师素养水平和体育教学质量,推进新时代体育师资队伍建设,采用文献研究法、访谈法、逻辑推理等方法,界定兼职体育教师的概念,分析我国兼职体育教师的需求原因及素养提升需求;通过解构教师素养结构体系,重新构建由基础素养、职业素养、专业素养组成的教师素养"金字塔"模型;并观照此模型及兼职体育教师素养现实提出兼职体育教师素养提升策略。  相似文献   

12周惯性哑铃练习对轻度认知损害老年人的干预效果     

吕娇娇  黄灵燕  刘宇 《上海体育学院学报》2020,(5):63-69,80

目的观察12周惯性哑铃练习对轻度认知损害(MCI)老年人认知功能、身体活动能力、生活质量和睡眠质量的影响,并探讨认知改善与其他功能改变之间的关系。方法将45名MCI老年人随机分为干预组(n=22)和对照组(n=23)。干预组受试者进行惯性哑铃练习(3次/周,60 min/次,持续12周),对照组不进行运动干预。结果 12周后,干预组受试者阿尔茨海默病评定量表-认知部分(ADAS-Cog)总分/指令得分、蒙特利尔认知评估量表(MoCA)评分、起立行走计时(TUG)和SF-36健康调查问卷(SF-36)心理总得分均显著改善(均P<0.05)。与对照组相比,干预组受试者ADAS-Cog总分/单词回忆得分/注意力得分、简明精神量表(MMSE)评分、TUG和匹兹堡睡眠指数(PSQI)的改善程度均具有显著差异(P<0.05或P=0.05)。偏相关分析结果显示,SF-36心理总得分改变(r=-0.712)、PSQI改变(r=-0.380)与认知改善程度均呈显著负相关。结论 12周惯性哑铃练习可显著提高MCI老年人的认知功能,并对其移动能力、生活质量和睡眠质量具有积极影响,且心理和睡眠改变程度可能影响认知功能的改善效果。  相似文献   

Simultaneous changes in seed size,oil content and protein content driven by selection of SWEET homologues during soybean domestication     

Shoudong Wang  Shulin Liu  Jie Wang  Kengo Yokosho  Bin Zhou  Ya-Chi Yu  Zhi Liu  Wolf B Frommer  Jian Feng Ma  Li-Qing Chen  Yuefeng Guan  Huixia Shou  Zhixi Tian 《国家科学评论(英文版)》2020,7(11):1776

Soybean accounts for more than half of the global production of oilseed and more than a quarter of the protein used globally for human food and animal feed. Soybean domestication involved parallel increases in seed size and oil content, and a concomitant decrease in protein content. However, science has not yet discovered whether these effects were due to selective pressure on a single gene or multiple genes. Here, re-sequencing data from >800 genotypes revealed a strong selection during soybean domestication on GmSWEET10a. The selection of GmSWEET10a conferred simultaneous increases in soybean-seed size and oil content as well as a reduction in the protein content. The result was validated using both near-isogenic lines carrying substitution of haplotype chromosomal segments and transgenic soybeans. Moreover, GmSWEET10b was found to be functionally redundant with its homologue GmSWEET10a and to be undergoing selection in current breeding, leading the the elite allele GmSWEET10b, a potential target for present-day soybean breeding. Both GmSWEET10a and GmSWEET10b were shown to transport sucrose and hexose, contributing to sugar allocation from seed coat to embryo, which consequently determines oil and protein contents and seed size in soybean. We conclude that past selection of optimal GmSWEET10a alleles drove the initial domestication of multiple soybean-seed traits and that targeted selection of the elite allele GmSWEET10b may further improve the yield and seed quality of modern soybean cultivars.  相似文献   

Is everyone in class in agreement and why (not)? Using student and teacher reports to predict within-class consensus on goal structures     

《Learning and Instruction》2021

Students in the same class can differ considerably in their perceptions of teaching quality, but little is known about the drivers of this lack of agreement. In this study, we relied on within-class consensus as a measure of agreement in students' perceptions and explored both student-reported predictors (Sample 1) and teacher-reported predictors (Sample 2) of consensus in students’ ratings of six goal structures dimensions (task, autonomy, recognition, grouping, evaluation, time). Classroom-level results from multi-level models indicated that student-perceived differential teacher treatment negatively predicted consensus regarding evaluation, as well as achievement heterogeneity, whereas instructional clarity positively predicted consensus for recognition, grouping, and evaluation, as well as class-average achievement (Sample 1). Mediating effects of achievement heterogeneity and achievement were not statistically significant. In Sample 2, negative effects of teacher-reported emotional exhaustion and teaching-related anxiety on consensus were observed for several dimensions. Teaching-related enjoyment had no effect.  相似文献