主题统觉测验的研究与应用现状

主题统觉测验是最主要的投射测验之一,它的理论基础是需要——压力理论。研究者对主题统觉测验材料,标准化及信效等方面进行了深入的研究。虽然对主题统觉测验还存在不少争议,但作为一种重要的间接测量技术,它在一定程度上避免了直接测量的缺陷,通过与直接测量技术结合,其应用也正走向多样化。     

高职院校思想政治理论课教学信度的探析

提高高职院校思想政治理论课教学信度,是充分发挥思想政治课德育功能的要求,是提高思想政治理论课教学质量的需要。通过对影响思想政治理论课教学信度的分析,提出增强高职院校思想政治理论课信度的策略。     

单自由度强迫振动的可靠性

随机因素对振动的影响不可忽略。本文将质量刚度、阻尼系数看作随机变量,研究了单自由度强迫振动的共振频率的可靠性。对随机变量进行计算机模拟,产生大量样本。应用Monte Carlo模拟研究了振动位移的可靠性。模拟次数越多,求得的可靠度精度越高。算例表明本文方法是正确的。     

Peer assessment in group projects accounting for assessor reliability by an iterative method

This study proposes an advanced method to factor in the contributions of individual group members engaged in an integrated group project using peer assessment procedures. Conway et al. proposed the Individual Weight Factor (IWF) method for peer assessment which has been extensively developed over the years. However, most methods associated with IWF use a simple average algorithm which still has limitations in effectively reflecting abnormal situations. Therefore, this study proposes an iterative method for measuring a fair IWF by considering each assessor's reliability. The proposed algorithm considers each assessor's reliability which is evaluated by an analysis of variance of the scores given by the assessor. This relative reliability factor is used to improve the fairness of the IWF and reduce the effect of unfair or unreliable assessors' scores. A comparison with previous methods demonstrates that the proposed method resulted in substantially more fair grades being given to individual students for group projects.     

海德格尔的“数学现象学”思想刍议

海德格尔一直都很重视数学的学习和研究,其颇具现象学色彩的"数学哲学"思想构成其科学哲学重要组成部分。他认为,"数学的东西"(ta mathemata)就是人们能够学会的东西,进一步讲它可以作为"知识"的标准而存在,它标明了事物的可敞开领域,在这一领域中只有特定的事物才能显现自身,它是现代科学、数学和形而上学的共同根源。此外,海德格尔认为,数学的可应用性是一种衍生特性,它奠基于数学的"可靠性",可靠性基于事物与此在的照面,或者说此在把存在者的可靠性"带上前来",只有那些可教的、可学的、与人照面的东西才能对其作出有用与否的评判。今天的数学虽然来自于古希腊广义的"数学的东西",但是两者还是有着本质的区别。     

Reliability analysis of a two-dependent-unit parallel system with a standby unit

A parallel system with two active components and a cold standby unit is studied in this paper. The two simultaneously working components are dependent and the copula function is used to model their dependence. An explicit expression is obtained for the mean time to failure of the system in terms of the copula function and marginal lifetime distributions in two different cases As an application, numerical calculations are presented corresponding to two different copula functions and marginal lifetime distributions.     

PLC控制系统干扰原因及解决措施

现代工厂企业所使用的控制主机大多为PLC,其现场布置有的是集中安装在控制室,有的是安装在生产现场或各设备上,由于工厂特殊的生产环境,PLC大多被强电或弱电信号所包围,其可靠性受到影响.该文主要研究PLC在实际应用中可能受到的干扰情况及解决方法.     

液压系统污染的控制

液压油液污染是液压系统发生故障的主要原因,其污染途径有潜在污染、侵入污染和新生污染,可采取减少外来污染、滤除杂质、控制液压油液的工作温度、定期检查更换液压油液来降低液压油液的污染程度,进而提高液压传动系统的可靠性.     

The relationship between inertial measurement unit-derived ‘force signatures’ and ground reaction forces during cricket pace bowling

Abstract

This study assessed the reliability and validity of segment measured accelerations in comparison to front foot contact (FFC) ground reaction force (GRF) during the delivery stride for cricket pace bowlers. Eleven recreational bowlers completed a 30-delivery bowling spell. Trunk- and tibia-mounted inertial measurement units (IMUs) were used to measure accelerations, converted to force, for comparisons to force plate GRF discrete measures. These measures included peak force, impulse and the continuous force–time curve in the vertical and braking (horizontal) planes. Reliability and validity was determined by intra-class correlation coefficients (ICC), coefficient of variation (CV), Bland–Altman plots, paired sample t-tests, Pearson’s correlation and one-dimensional (1D) statistical parametrical mapping (SPM). All ICC (0.90–0.98) and CV (4.23–7.41%) were acceptable, except for tibia-mounted IMU braking peak force (CV = 12.44%) and impulse (CV = 18.17%) and trunk vertical impulse (CV = 17.93%). Bland–Altman plots revealed wide limits of agreement between discrete IMU force signatures and force plate GRF. The 1D SPM outlined numerous significant (p < 0.01) differences between trunk- and tibia-located IMU-derived measures and force plate GRF traces in vertical and braking (horizontal) planes. The trunk- and tibia-mounted IMUs appeared to not represent the GRF experienced during pace bowling FFC when compared to a gold-standard force plate.     

一个网络管理信息系统的软件设计过程

本文从软件开发角度介绍一个大型网络管理信息系统的设计过程,重点给出设计中使用的方法和技巧.