民族院校开展远程教育的对策

远程教育以其高效、灵活、多样、开放等特点已成为现代教育的重要手段。民族院校开展远程教育面临一定困难，但社会意义重大，需要加大对基础设施的投资力度和人才的培养。     

关于远程教育土木工程CAD课程教学的思考

本文主要阐述了远程教育土木工程CAD课程教学中存在的和不能忽视的问题,希望能对该课程教学改革有所帮助.     

用测量不确定度GUM表示测量误差的方法

测量不确定度GUM的评定与表示是一个较新的概念,其应用具有广泛性和实用性。用测量不确定度来表示测量误差的方法,是科技交流和国际贸易的迫切要求。它使各国进行的测量及其所得结果可以进行相互比对,以取得相互间的承认或共识,从而受到了国际组织和各国计量部门的高度重视。     

基于网络问答社区的话题识别与分析——以知乎“老年人”话题为例

[目的/意义]针对目前基于网络的话题识别与分析方法的局限性,提出针对网络问答社区的话题识别与分析方法,为此类网站的话题识别与分析提供参考。[方法/过程]以改进的中文分词技术为基础,构建网络问答社区的话题识别指标,通过线性加权方式计算权重,结合关键词提取方法确定话题关键词,对话题关注焦点进行提取,对分布情况进行测度。依据所提出的改进方法,以知乎网站为数据来源,从话题关键词、关键词分布以及热点子话题3个角度对"老年人"话题焦点进行识别与分析。[结果/结论]研究表明,该方法具有科学性和可行性,不仅拓展了社会问题的分析数据源,也为"积极开展应对人口老龄化行动"提供了决策依据。     

Helical angle measurement of worm by a coordinate measuring machine and its uncertainty evaluation

The purpose of the study concerns the measurement of worm’s helical angle by a coordinate measurement machine in the ambient industrial environment. The novel measurement method and sampling strategy were described firstly. This method used the coordinate measurement machine to measure both of the worm gear’s left and right surfaces. The worm surface was reconstructed based on the measured data of all the sampling points. Then a middle cylinder was established to truncate the fitted worm surfaces, and the truncated spiral lines were straightened to calculate the helical angle. The measurement uncertainty of worm’s helical angle was evaluated by taking the difference of calculated helical angles along the truncated spiral lines on both the left and right side surfaces of the worm. Twenty-four measurement experiments show that the maximum measurement error of the proposed method is 0.105, and the measurement error ratios are all less than 3.5?. The result means that the measurement method can realize the precision measurement of worm’s helical angle and can be employed in the generally industrial application.     

远程开放教育成本与效益分析

远程开放教育运用广播电视和计算机网络多媒体技术,使受教育者的数量无限,与国家的“科教兴国”、“全面学习,终身学习”的教育战略相符。但是新技术投资的成本高,其效益的估算难,且如何减少成本,提高效益是有待研讨的课题,需要认真进行分析。一、远程开放教育成本核算的重要意     

一种凸轮升程误差的非接触式测量新方法

分析现有几种凸轮升程误差测量方法的优、缺点后，提出一种基于图像处理的凸轮升程误差的非接触式测量新方法．理论分析和比较实验结果表明，该测量方法简便易行，测量精度较高，具有一定的应用价值．     

Assessment of three-dimensional joint kinematics of the upper limb during simulated swimming using wearable inertial-magnetic measurement units

The analysis of the joint kinematics during swimming plays a fundamental role both in sports conditioning and in clinical contexts. Contrary to the traditional video analysis, wearable inertial-magnetic measurements units (IMMUs) allow to analyse both the underwater and aerial phases of the swimming stroke over the whole length of the swimming pool. Furthermore, the rapid calibration and short data processing required by IMMUs provide coaches and athletes with an immediate feedback on swimming kinematics during training. This study aimed to develop a protocol to assess the three-dimensional kinematics of the upper limbs during swimming using IMMUs. Kinematics were evaluated during simulated dry-land swimming trials performed in the laboratory by eight swimmers. A stereo-photogrammetric system was used as the gold standard. The results showed high coefficient of multiple correlation (CMC) values, with median (first–third quartile) of 0.97 (0.93–0.95) and 0.99 (0.97–0.99) for simulated front-crawl and breaststroke, respectively. Furthermore, the joint angles were estimated with an accuracy increasing from distal to proximal joints, with wrist indices showing median CMC values always higher than 0.90. The present findings represent an important step towards the practical use of technology based on IMMUs for the kinematic analysis of swimming in applied contexts.     

Accelerometer data requirements for reliable estimation of habitual physical activity and sedentary time of children during the early years - a worked example following a stepped approach

This study presents a worked example of a stepped process to reliably estimate the habitual physical activity and sedentary time of a sample of young children. A total of 299 children (2.9 ± 0.6 years) were recruited. Outcome variables were daily minutes of total physical activity, sedentary time, moderate to vigorous physical activity and proportional values of each variable. In total, 282 (94%) provided 3 h of accelerometer data on ≥1 day and were included in a 6-step process: Step-1: determine minimum wear-time; Step-2: process 7-day-data; Step-3: determine the inclusion of a weekend day; Step-4: examine day-to-day variability; Step-5: calculate single day intraclass correlation (ICC) (2,1); Step-6: calculate number of days required to reach reliability. Following the process the results were, Step-1: 6 h was estimated as minimum wear-time of a standard day. Step-2: 98 (32%) children had ≥6 h wear on 7 days. Step-3: no differences were found between weekdays and weekend days (P ≥ 0.05). Step-4: no differences were found between day-to-day variability (P ≥ 0.05). Step-5: single day ICC’s (2,1) ranged from 0.48 (total physical activity and sedentary time) to 0.53 (proportion of moderate to vigorous physical activity). Step-6: to reach reliability (ICC = 0.7), 3 days were required for all outcomes. In conclusion following a 7 day wear protocol, ≥6 h on any 3 days was found to have acceptable reliability. The stepped-process offers researchers a method to derive sample-specific wear-time criterion.     

理解:开放、融合与扩充--试析加达默尔诠释学中的理解问题

加达默尔的诠释学从一个全新的角度论述了理解问题,使哲学诠释学成为一个独立的哲学流派,在现代西方哲学史上产生了巨大的影响。他认为理解是此在本身的存在方式;理解具有历史性;理解按其本性乃是一种效果历史事件,而视域融合又是对效果历史的展示和具体说明。因此,理解效果历史原则是把握加达默尔理解问题的关键。