灰色预测法在情报研究中的应用研究综述     

张晶晶  李泽霞 《图书情报工作》2021,64(24):106-114

[目的/意义] 灰色预测法可有效处理情报研究中广泛存在的小样本数据，通过对灰色预测法在情报研究中的应用情况进行梳理，总结其在应用过程中存在的不足，为灰色预测法在情报研究中的进一步应用提供参考。[方法/过程] 通过综述情报研究中涉及灰色预测法的相关文献，从数据选取、模型构建和解决的问题等方面对情报研究中灰色预测法的应用进行概述，总结当前情报研究中灰色预测法的应用所存在的问题，并提出改进建议。[结果/结论] 在方法应用上，已有研究主要采用数列灰预测，且模型集中在单变量灰色预测模型，根据预测对象不同，灰色预测法已经在包括期刊分析、图书馆运行管理、热点主题分析及科研机构评价方面得到了很好的应用，未来可根据预测对象特点及研究目标尝试不同的灰色预测方法，扩宽灰色预测法在其他方面的情报研究问题中的应用。  相似文献   

Power training in elite young soccer players: Effects of using loads above or below the optimum power zone     

Irineu Loturco  Lucas A. Pereira  Valter P. Reis  Chris Bishop  Vinicius Zanetti  Pedro E. Alcaraz 《Journal of sports sciences》2020,38(11-12):1416-1422

ABSTRACT

This study aimed to examine the effects of two jump squat (JS) training programs involving different loading ranges in under-20 soccer players during a preseason period. Twenty-three elite young soccer players performed sprint speed (at 5-, 10-, and 20-m), change-of-direction (COD) speed, JS peak-power (PP), and countermovement jump (CMJ) tests pre and post four weeks of training. Athletes were pair-matched in two groups according to their optimum power loads (OPL) as follows: lower than OPL (LOPL; athletes who trained at a load 20% lower than the OPL) and higher than OPL (HOPL; athletes who trained at a load 20% higher than the OPL). Magnitude-based inferences were used to compare pre- and post-training measures. Meaningful increases in the PP JS were observed for both groups. Likely and possible improvements were observed in the 5- and 10-m sprint velocity in the LOPL group. Meanwhile, possible and likely improvements were observed in the CMJ, 5- and 10-m sprint velocity, and COD speed in the HOPL group. Overall, both training schemes induced positive changes in athletic performance. Soccer coaches and sport scientists can implement the JS OPL-based training schemes presented here, either separately or combined, to improve the physical performance of youth soccer players.  相似文献   

Genetic Polymorphism of Angiotensin II Type 1 Receptors and Their Effect on the Clinical Outcome of Captopril Treatment in Arab Iraqi Patients with Acute Coronary Syndrome (Mid Euphrates)     

Fadhaa A. Ghafil  Bassim I. Mohammad  Hussain S. Al-Janabi  Najah R. Hadi  Hayder A. Al-Aubaidy 《Indian journal of clinical biochemistry : IJCB》2021,36(1):81

Genetic variation in the angiotensin II type 1 receptor (AT1R) has an important effect on the outcome of acute coronary syndrome (ACS) initiated treatment with captopril. This study aims to investigate the impact of genetic polymorphism of AT1R (rs5186 and rs275651) on the ACS outcome in Iraqi patients treated with captopril. A total of 250 Iraqi individuals with ACS were included in this case—control study and they were divided into two study groups; Study group 1 included 125 participants who were prescribed captopril, 25 mg twice daily and study group 2 included 125 participants who received no captopril as part of their ACS treatment (control study). The AT1R gene (rs5186) CC genotype was found to be associated with ST-elevation myocardial infarction (STEMI) (Odd’s ratio (O.R) = 1.2, P = 0.7), while AC was associated with Non-ST-elevation myocardial infarction (NSTEMI) and unstable angina (UA) (O.R = 1.2, P = 0.8). AC genotype is more prone to have Percutaneous coronary intervention (PCI) after ACS attack (O.R = 1.2, P = 0.6). CC genotype had a risk to get less improvement (O.R = 1.6, P = 0.5), so might require higher doses of captopril during acute coronary insult. The AT1R gene (rs275651) AA genotype was associated with UA (O.R = 1.3, P = 0.9). AA and AT genotypes were more prone to have PCI after ACS attack (O.R = 3.9 P = 0.2, O.R = 3.5, P = 0.3 respectively) and thus requiring higher doses of captopril. We conclude that the AT1R rs5186, rs275651 genetic polymorphisms might partially affect the clinical outcome of ACS patients treated with captopril and might have captopril resistance which requires higher doses.  相似文献   

肌筋膜疼痛综合征诱因及外治手段研究进展     

林键杰  张翔 《体育科技文献通报》2020,(4):28-31

不良生活习惯和伤后康复不佳导致的肌筋膜疼痛综合征已经成为当前影响人们生活质量的因素之一。本文运用文献资料法,梳理肌筋膜疼痛综合征的诱因及外治(非内服药物治疗)手段,探究其干预手段的疗效,由病因入手,研究最佳干预方法。综合研究表明:(1)肌筋膜疼痛综合征病因包括:骨骼肌及筋膜外伤、风寒入侵机体、慢性劳损、局部肌筋膜慢性炎症损伤等;(2)目前对肌筋膜疼痛综合征康复的方法主要以针刺和温和灸为主,本文纳入针刺治疗和温和灸治疗有效率高达89.5%和100%;(3)其发病的常见部位为腰背部及肩颈部,不同部位、不同病因的肌筋膜疼痛综合征应采取不同的治疗方式,复合治疗方法比单一手段干预效果更佳。  相似文献   

北京冬奥会背景下黑龙江省高校冰雪运动发展路径     

刘义峰  李冰  穆亮  关富余  何志海  贺鹤  康建鑫  赵赟昀 《哈尔滨体育学院学报》2020,(2):38-43

2022年冬奥会已进入北京时间。黑龙江省各高校应在习主席新时代中国特色社会主义思想引领下,深入贯彻党的教育方针,将立德树人根本任务深切落到实处,积极响应"带动3亿人参与冰雪运动"的伟大号召,加速发展高校冰雪运动。本文采用文献资料、逻辑分析、归纳等研究方法,对北京冬奥会背景下黑龙江省高校冰雪运动发展的现状及存在问题进行分析,并探寻一条符合新时代发展需要的黑龙江省高校冰雪运动发展路径,旨在全面振兴黑龙江省高校冰雪运动,为2022年北京冬奥会保驾护航。  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   

基于QFD和案例推理的绿色产品设计方案选择研究     

杨东  柴慧敏 《科技管理研究》2018,(16)

应用QFD和案例推理的思想,利用通过QFD方法形成的质量特性及其权重来评价备选的绿色产品设计方案,然后检索出与决策者期望之间相似性最大的绿色产品设计方案。结果表明基于QFD方法可以有效地构建绿色产品设计方案中的指标体系和指标权重。此外案例推理是一种有效的绿色产品设计方案选择方法。可根据实际情况,进行绿色产品设计方案选择,具有一定的实用价值。  相似文献   

对刊文《科技管理研究》的计量分析——基于知识图谱视角     

赖志杰  李炳超  李细金  黄宝强 《科技管理研究》2018,(14)

本文通过在CNKI数据库中搜索了来源期刊为《科技管理研究》(2003-2016.9)的相关文献,运用科学计量分析方法,对其现状和研究热点进行了分析。研究发现,技术创新、影响因素、知识产权、产业集聚、指标体系、科技创新等都是近年来研究的热门话题。  相似文献   

Young children's near and far transfer of the basic theory of natural selection: An analogical storybook intervention          下载免费PDF全文

Natalie Emmons  Kristin Lees  Deborah Kelemen 《科学教学研究杂志》2018,55(3):321-347

Misconceptions about adaptation by natural selection are widespread among adults and likely stem, in part, from cognitive biases and intuitive theories observable in early childhood. Current educational guidelines that recommend delaying comprehensive instruction on the topic of adaptation until adolescence, therefore, raise concerns because children's scientifically inaccurate theories about species may be left unchallenged for many years, allowing them to entrench and become difficult to overcome. In consequence, this investigation sought to explore whether classrooms of kindergartners and second graders could acquire a basic but comprehensive understanding of adaptation from an intervention constructed around two picture storybooks that mechanistically explain natural selection. Learning was assessed in near and far transfer contexts both immediately and a month later. Kindergartners and second graders demonstrated substantial learning of biological information; however, second graders showed pronounced abilities to near and far generalize, immediately and over time. Results suggest that causally cohesive interventions with an emphasis on mechanistic explanation facilitate children's classroom learning of complex counterintuitive scientific ideas.  相似文献   

林业科技期刊的办刊现状及发展路径探讨——以《湖北林业科技》为例     

郑京津  袁传武  蔡三山  张家来 《中国科技期刊研究》2018,29(8):860-865

【目的】 随着国家对生态文明的重视，人民对优美生态环境的需要，林业科技期刊作为林业科学知识的传播媒介，在生态文明建设中的作用愈来愈重要。探索中文期刊的办刊之路，为切实提高办刊质量提供参考。【方法】 以《湖北林业科技》为例，分析目前林业科技期刊的办刊现状，针对期刊发展中存在的体制改革、稿源不足、稿件缺乏严格把关、办刊动力不足、自身推广不力、刊发文章内容混杂、低水平运行难有突破等质量问题以及人才队伍建设问题，探讨期刊的发展路径。【结果】 提出编营分离模式，契合定位、做强主业，以及走专家学者办刊之路等办刊策略。【结论】 符合自身发展特点的编营分离模式能为林业科技期刊提供好的办刊思路和办法，促进中文期刊打破发展瓶颈。  相似文献