理解监测及其准确性     

赵晶  李荔波 《浙江教育学院学报》2010,(1):44-47

理解监测是元理解的重要组成，是学习者对自身理解状态进行判断的过程，受到研究者的广泛关注。已有研究对理解监测的产生机制、准确性及其提高策略进行了探讨。从社会文化和文本阅读加工角度继续深入探索是今后研究的主要方向。  相似文献   

略论运动生物力学的研究方法与测量技术   总被引：4，自引：0，他引：4  

李建设 《体育科学》1999,(2):84-87

文章认为:1,仅依靠牛顿分析力学的研究方法,运动生物力学只能停留在“研究人体机械运动规律”的水平,“走出系统”的研究方法适合于对活体系统的生物力学研究;2,“理论模型”需数据支持才具有应用价值,“数据模型”需相应的数学化才具有理论意义;3,活体运动过程的测量应建立参数采集与测量的标准化和参数分析与评价的专家系统;4,应界定常规参数和敏感参数,并区别参数间的平行关系和因果关系,测量精度的提高主要应依靠测量参数数字化过程的分析方法的进步。  相似文献   

体操运动员前臂运动特征及其发展特点的研究     

李宁 《体育科学》1998,18(1):0

采用直观半圆仪,对我国441名体操运动员和563名青少年儿童的前臂屈伸复制运动误差值作了测定和比较分析等研究,结果发现,就这个非专业性的和极为普通的动作——前臂屈伸运动的准确性来讲,在运动等级不同的体操运动员之间以及体操运动员与同年龄的普通人之间,都存在明显的差别。而且,这种运动准确性较高者,学习基本体操动作的成效优于准确性较低者。这种运动的准确性在7～11岁期间提高最快,12～22岁时呈波浪式的发展状态;在体操运动训练的作用下,这种运动的准确性,在9～13岁加速提高,而且,随后的波浪式变化明显减小。  相似文献   

艾略特诗歌复杂性和多样性根源探究   总被引：2，自引：0，他引：2  

高鸿 《福建师范大学学报(哲学社会科学版)》2000,(3)

本文通过把艾略特对但丁诗歌的阐释性评述与艾略特诗歌《荒原》并读的方式 ,从两个方面认识和探究艾略特诗歌复杂性和多样性的根源 :其一 ,艾略特诗歌中频繁的引经据典和多种文字的交织目的是构筑人类文化精神家园的基石 ;其二 ,艾略特诗歌的复杂性和多样性是与代表中世纪思维的寓象方法有关  相似文献   

跳远运动员助跑速度感知能力训练对踏板准确性影响的实验研究   总被引：2，自引：0，他引：2  

马兆明 《沈阳体育学院学报》2008,27(4):101-105

通过问卷调查和实验法对跳远运动员助跑踏板准确性和影响跳远运动员助跑速度感知能力的主要因素进行理论与逻辑分析,根据跳远专项特点优选出9种训练方法,实验组采用优选训练手段,对照组采用常用普通训练手段。在严格控制训练过程及训练条件下,进行为期16周的速度感知能力的训练,保证两组只在训练内容方面不同外,其余方面保持一致。实验后对实验组和对照组再次进行踏板准确性和跳远成绩的测定,结果表明:实验后实验组与对照组的跳远成绩与踏板准确性具有明显的差异性。  相似文献   

Lifesource XL-18 pedometer for measuring steps under controlled and free-living conditions     

Sam Liu  Dina Brooks  Scott Thomas  Gunther Eysenbach  Robert Peter Nolan 《Journal of sports sciences》2015,33(10):1001-1006

The primary aim was to examine the criterion and construct validity and test–retest reliability of the Lifesource XL-18 pedometer (A&D Medical, Toronto, ON, Canada) for measuring steps under controlled and free-living activities. The influence of body mass index, waist size and walking speed on the criterion validity of XL-18 was also explored. Forty adults (35–74 years) performed a 6-min walk test in the controlled condition, and the criterion validity of XL-18 was assessed by comparing it to steps counted manually. Thirty-five adults participated in the free-living condition and the construct validity of XL-18 was assessed by comparing it to Yamax SW-200 (YAMAX Health & Sports, Inc., San Antonio, TX, USA). During the controlled condition, XL-18 did not significantly differ from criterion (P > 0.05) and no systematic error was found using Bland–Altman analysis. The accuracy of XL-18 decreased with slower walking speed (P = 0.001). During the free-living condition, Bland–Altman analysis revealed that XL-18 overestimated daily steps by 327 ± 118 than Yamax (P = 0.004). However, the absolute percent error (APE) (6.5 ± 0.58%) was still within an acceptable range. XL-18 did not differ statistically between pant pockets. XL-18 is suitable for measuring steps in controlled and free-living conditions. However, caution may be required when interpreting the steps recorded under slower speeds and free-living conditions.  相似文献   

基于BP网络的有教师分类算法及应用     

唐凤仙  汤鹏杰 《河池学院学报》2011,31(2):41-45

介绍BP神经网络的结构及相关算法,并通过实验比较不同情况下对BP神经网络的收敛速度与分类精度的影响。实验表明,合适的参数设置能提高BP神经网络算法的分类精度。  相似文献   

焊接机器人模块化工装组夹及复现工艺研究     

胡战明  宋博宇  张学海  李学强 《包头职业技术学院学报》2021,(1):1-2,31

焊接机器人工装组夹及产品复现在生产中是极为重要的,文章针对焊接机器人对工装精确度的要求,采用棋盘方格定位法和复现工艺,实现了焊接工装和机器人重复定位精度的要求,在多种产品上得到应用推广。  相似文献   

The Domain-Specificity of Elementary School Teachers’ Judgment Accuracy     

《Contemporary educational psychology》2023

Teachers’ diagnostic competence for accurately judging students’ achievement is essential for instructional practice and professional decisions. To promote their judgment accuracy, it is important to know if this is a general or domain-specific skill. We investigated teachers’ judgment accuracy in German language (one subdomain: reading) and mathematics (two subdomains: geometry; stochastics) and examined differences across domains (i.e., German and mathematics) and across subdomains (reading; geometry; stochastics). We examined the judgment accuracy of 59 German elementary school teachers who teach both German and mathematics, judging the achievement of 1227 students in the three subdomains. We conducted multilevel analyses with a subsample of 39 teachers and 787 students and calculated different accuracy components (i.e., rank, level, and differentiation) to examine the comparability of our results. In line with prior research, findings revealed that teachers’ judgments were fairly accurate. However, there were significant differences between teachers’ average judgment accuracy in different subdomains (between-person comparisons) and no or only a weak relation between individual teachers’ judgment accuracy in different subdomains (within-person comparisons). Findings support the notion that teachers’ judgment accuracy of student achievement is domain-specific with respect to the investigated subdomains. Practical implications for the promotion of teacher judgment accuracy are discussed.  相似文献   

车轴加工流水线提高定位精度和运行安全的措施     

任荣 《中国科技纵横》2014,(16):77-77

太原北车辆段2013年轮轴生产线改造的主体工程--车轴加工流水线建造投产,是全路第一条半龙门轨道机械手运行模式流水线,设计五台车轴机械手完成生产过程中车轴工件的自动输送作业。由于采用伺服系统的空中作业方式,最直接的优点是输送快速准确、传递效率高、工作环境简洁开阔,但另一方面由于是空中输送,机械手上下料定位准确性、运行安全意识丝毫不能松怠。  相似文献