Static and dynamic accuracy of a magnetic-inertial measurement unit used to provide racket swing kinematics     

Benjamin Kane Williams  Ross H. Sanders  Joong Hyun Ryu  Pitre C. Bourdon  Philip Graham-Smith  Peter J. Sinclair 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(2):202-214

Magnetic-inertial measurement units (MIMUs) are becoming more prevalent in sports biomechanics and may be a viable tool to evaluate kinematic parameters. This study examined the accuracy of a MIMU to estimate orientation angles under static conditions and dynamically from a squash racket during a forehand drive shot. A MIMU was mounted onto a goniometer and moved through 0–90°, with static data collected at 10° increments during 10 repetitions of all three axes. Typical error analyses showed the MIMU to be very reliable (TE ≤ 0.03°). MIMU accuracy was determined via intraclass correlation coefficients (ICC) (r > 0.999, p < 0.001). An ordinary least products regression showed no proportional bias and minimal fixed bias for all axes. Dynamic accuracy was assessed by comparing MIMU and optical motion capture data of squash racket swing kinematics. A MIMU was fixed onto a racket and 10 participants each hit 10 forehand shots. Mean orientation angle error at ball impact was <0.50° and ICC showed very high correlations (r ≥ 0.988, p < 0.001) for all orientations. Swing phase root mean squared errors were ≤2.20°. These results indicate that a MIMU could be used to accurately and reliably estimate selected racket swing kinematics.  相似文献   

Digital Module 07: Subscores: Evaluation and Reporting https://ncme.elevate.commpartners.com     

Sandip Sinharay 《Educational Measurement》2019,38(3):114-115

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Statistical learning for OCR error correction     

Jie Mei  Aminul Islam  Abidalrahman Moh’d  Yajing Wu  Evangelos Milios 《Information processing & management》2018,54(6):874-887

Modern OCR engines incorporate some form of error correction, typically based on dictionaries. However, there are still residual errors that decrease performance of natural language processing algorithms applied to OCR text. In this paper, we present a statistical learning model for post-processing OCR errors, either in a fully automatic manner or followed by minimal user interaction to further reduce error rate. Our model employs web-scale corpora and integrates a rich set of linguistic features. Through an interdependent learning pipeline, our model produces and continuously refines the error detection and suggestion of candidate corrections. Evaluated on a historical biology book with complex error patterns, our model outperforms various baseline methods in the automatic mode and shows an even greater advantage when involving minimal user interaction. Quantitative analysis of each computational step further suggests that our proposed model is well-suited for handling volatile and complex OCR error patterns, which are beyond the capabilities of error correction incorporated in OCR engines.  相似文献   

网络课程的内容进化机制设计与技术实现   总被引：1，自引：0，他引：1  

谭霓  余胜泉  吕啸 《远程教育杂志》2011,29(1):80-84

当前我国网络课程建设与应用普遍存在以下问题:课程内容结构封闭和更新迟缓,教学形式具有单向传递性;课程内容与学习活动在应用上的分离,影响学生主体地位的发挥;不同教学学期衔接或课程内容在不同教师间共享时,教学过程中的生成性资源存在丢失的现象。因此,探讨如何根据网络课程内容进化理念,提供相应的环境与机制,从而促进学习内容、教师及学生三者在网络教学过程中的交互,并通过积聚大众智慧来促进课程内容的动态发展,对于提高网络课程教学质量具有重要意义。  相似文献   

确立精品意识 争创一流期刊——关于办好《渭南师范学院学报》的思考     

牛怀岗 《渭南师范学院学报》2001,16(3):84-87

未来报刊市场不再是数量与规模的增长，而是质量的竞争，即期刊的精品化。要办好期刊，一是要坚持正确的舆论导向；二是要树立精品意识，争创期刊名牌；三是要加强业务学习，使学报出版规范化；四是要精心策划，发挥优势，办出特色；五是要面向社会，加强交流与合作。  相似文献   

布朗运动对油滴实验的影响     

欧海峰  王会永 《实验技术与管理》2007,24(7):38-40,54

以往，布朗运动对油滴实验产生的影响都只是作定性的描述。该文利用统计物理中布朗微粒方均位移的表达式，导出布朗运动引起的时间误差公式，推导了3种包含布朗运动的误差与不包含布朗运动的误差的比值公式，并作出相应的曲线图和曲面图进行直观的分析，得出的结论是：布朗运动对油滴实验的影响是很明显的。  相似文献   

孙犁的编辑思想略论     

宗健梅 《河北师范大学学报(哲学社会科学版)》2006,29(6):156-160

孙犁是一位卓有成绩的,具有独到见解的编辑家.其独到见解主要体现在:一、主张办刊要小而精,以发现新人培养新人为办刊方向;二、提出了编辑要成为"杂家"的论说;三、倡导编辑既做编辑,也是作者;四,对作者的原稿,可改可不改者,不改;可删可不删者,不删.不代作者作文章.多少年来,人们只谈孙犁的文学成就,却很少论及他的编辑实践活动.其实,孙犁的编辑实践活动,自始至终伴随着他文学创作的实践活动,可以说,编辑工作是孙犁文学创作生涯的一个组成部分.  相似文献   

翻转课堂的误区及路径选择     

杨新燕  查晓虎 《宿州教育学院学报》2021,(1)

翻转课堂作为“互联网+教育”的产物受到了许多学者的青睐,但是在实施过程中翻转课堂的优势并没有真正发挥出来,随着实践的不断深入,翻转课堂的误区越来越明显。文章从厘清翻转课堂的概念出发,发现翻转课堂存在罗列书本内容、翻转形式机械运用、教师职能弱化、评价标准缺失的误区,并提出走出翻转课堂误区的路径,如科学规划教学内容、处理好“放手”与“松手”的关系、培养学生提出问题的能力、完善评价制度,以更好地促进翻转课堂的实施。  相似文献   

《汉书·艺文志》之敬儒思想     

张贺 《宿州教育学院学报》2021,(1)

《汉书·艺文志》是我国官修史志目录的开山之作,由东汉班固根据刘歆的《七略》增删改撰而成。《汉书·艺文志》中班固的敬儒思想主要体现在两个方面:序文的撰写,以总序和《六艺略》《诸子略》和《诗赋略》的序文为例;在“略”“种”的排序中,班固将《六艺略》置于六略之首,把《易》放在《六艺略》之首,诸子各家中又首推儒家。在序文的撰写和图书的编次中都表现出了鲜明的敬儒倾向,这种倾向既有其特定的时代背景,又有其个人因素。  相似文献   

CRISPR/Cas: a Nobel Prize award-winning precise genome editing technology for gene therapy and crop improvement     

Li  Chao  Brant  Eleanor  Budak  Hikmet  Zhang  Baohong 《Journal of Zhejiang University. Science. B》2021,22(4):253-284

Since it was first recognized in bacteria and archaea as a mechanism for innate viral immunity in the early 2010 s,clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR-associated protein(Cas) has rapidly been developed into a robust, multifunctional genome editing tool with many uses. Following the discovery of the initial CRISPR/Cas-based system, the technology has been advanced to facilitate a multitude of different functions. These include development as a base editor, prime editor, epigenetic editor, and CRISPR interference(CRISPRi) and CRISPR activator(CRISPRa) gene regulators. It can also be used for chromatin and RNA targeting and imaging. Its applications have proved revolutionary across numerous biological fields, especially in biomedical and agricultural improvement. As a diagnostic tool, CRISPR has been developed to aid the detection and screening of both human and plant diseases, and has even been applied during the current coronavirus disease 2019(COVID-19) pandemic. CRISPR/Cas is also being trialed as a new form of gene therapy for treating various human diseases, including cancers, and has aided drug development. In terms of agricultural breeding, precise targeting of biological pathways via CRISPR/Cas has been key to regulating molecular biosynthesis and allowing modification of proteins, starch, oil, and other functional components for crop improvement. Adding to this, CRISPR/Cas has been shown capable of significantly enhancing both plant tolerance to environmental stresses and overall crop yield via the targeting of various agronomically important gene regulators. Looking to the future, increasing the efficiency and precision of CRISPR/Cas delivery systems and limiting off-target activity are two major challenges for wider application of the technology. This review provides an in-depth overview of current CRISPR development, including the advantages and disadvantages of the technology,recent applications, and future considerations.  相似文献