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   

试析延安整风运动与建国初期的整风运动之异同     

尹凌霞 《邵阳学院学报(社会科学版)》2011,10(2):29-31

延安整风运动和建国初期的整风运动,在中共党史上都占有非常重要的地位。文章拟从整风发生在关键时刻、整风的方法、党的领导与当时的中心任务三个方面来分析两次整风的相似之处;从发生的背景、内容、准备和进行的时间以及存在和遗留的问题等几个方面来阐述他们的相异之处,以期对党史研究能提供有益借鉴。  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   

Influence of Magnetic Field on the Rectification Process of Binary Heterogeneous Azeotrope     

贾绍义  吴松海李真 贾亮 《天津大学学报(英文版)》2005,11(4):240-244

To improve separate effect of binary heterogeneous azeotrope in the magnetic field with different magnetic induction intensity, the influence of magnetic field on the rectification process of binary heterogeneous azeotrope was investigated with l-butanol-water system. The results show that the composition of liquid-liquid phase equilibrium of l-butanol-water system has definitely changed, the composition of l-butanol in light phase （l-butanol layer） increases by 1. 17%-1.63% and the composition of water in heavy phase （water layer） increases by 1.21%-1.58% under the influence of magnetic field. By separation of magnetization, the composition of l-butanol increases by 0.8%-1.2% and the recovery ratio of 1 -butanol increases by 1.6%-2.5%. Magnetic field has positive effect, however, the magnetized effect is not in proportion to magnetic induction intensity and has an optimum condition, in the range of 0.25 T-0. 3 T.  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   

油气勘探开发论文题名英译常见谬误简析   总被引：2，自引：0，他引：2  

王大锐  Jin Jisuo  Liu Chengjie 《编辑学报》2006,18(4):262-263

根据对<石油勘探与开发>近千篇论文英文摘要的编校实践,列举出油气勘探开发论文题名英译出现的一些问题,并进行简析.  相似文献   

前期差错更正所得税的会计处理     

段悦兰 《科技创业月刊》2007,20(11):60-60,75

企业在会计核算过程中可能会发生各种各样的差错,产生错账。错账会影响财务报表使用者对企业财务状况、经营成果和现金流量作出正确判断。就企业发现重要的前期差错时,对前期差错更正涉及到所得税时如何进行会计处理进行了探讨。  相似文献   

滚齿机床工作台偏差数据采集与补偿系统     

章赞  陶晓杰 《中国科技信息》2005,16(18):21-22

本文介绍一种基于PC的数控滚齿机床工作台偏差数据采集与补偿系统。该系统充分利用了一块AC6011数据采集卡实现了多路采集与控制功能,结合PC机强大的数据处理功能与软件的良好支持,实现了智能数据采集与补偿系统的低成本开发。  相似文献