Haptic Cooperative Virtual Workspace: Architecture and evaluation

The Haptic Cooperative Virtual Workspace (HCVW), where users can simultaneously manipulate and haptically feel the same object, is beneficial and in some cases indispensable for training a team of surgeons, or in application areas in telerobotics and entertainment. In this paper we propose an architecture for the haptic cooperative workspace where the participants can kinesthetically interact, feel and push each other simultaneously while moving in the simulation. This involves the ability to manipulate the same virtual object at the same time. A set of experiments carried out to investigate the haptic cooperative workspace is reported. A new approach to quantitatively evaluate the cooperative haptic system is proposed, which can be extended to evaluate haptic systems in general.     

Dynamics of Flexible Multibody Systems Using Virtual Work and Linear Graph Theory

By combining linear graph theory with the principle of virtualwork, a dynamic formulation is obtained that extends graph-theoreticmodelling methods to the analysis of flexible multibody systems. Thesystem is represented by a linear graph, in which nodes representreference frames on rigid and flexible bodies, and edges representcomponents that connect these frames. By selecting a spanning tree forthe graph, the analyst can choose the set of coordinates appearing inthe final system of equations. This set can include absolute, joint, orelastic coordinates, or some combination thereof. If desired, allnon-working constraint forces and torques can be automaticallyeliminated from the dynamic equations by exploiting the properties ofvirtual work. The formulation has been implemented in a computerprogram, DynaFlex, that generates the equations of motion in symbolicform. Three examples are presented to demonstrate the application of theformulation, and to validate the symbolic computer implementation.     

一台用于环境样品分析的γ谱仪系统的性能与评论

本文介绍和评论了我所建立的环境实验室Ge(Li)γ谱仪系统的性能和应用。提出了一般环境实验室中使用一个中等体积和性能的高分辨率锗或Ge(Li)γ谱仪,加上适当的物质屏蔽就可以满足一般环境或生物样品中γ谱分析。     

机载电缆作战损毁后智能化诊断系统

从技战术实际需要出发,给出了某型飞机作战损毁后机载电缆的智能化诊断系统的硬件结构框图。根据硬件系统模拟开关组件的原理,定义了电缆的连接矩阵、测量矩阵以及断口的映像矩阵运算,给出了断头查找的算法。计算表明,系统可在20 min内完成一个循环的断头查找并给出故障定位。     

Estimation of energy expenditure in a work environment: Comparison of accelerometry and oxygen consumption/heart rate regression

The aim of this study was to compare estimation of energy expenditure (EE) in working environments, either from accelerometry or from an individual oxygen consumption/heart rate ([Vdot]O₂/HR) regression curve. The study participants were 46 volunteer workers aged 27±6 years old. A significant correlation between EE predicted by the [Vdot]O₂/HR curve and the accelerometer was observed (r=0.78, p <0.01). However, more disparities were observed between the two methods when the mean job intensity was not within 16% and 23% higher than resting HR. The accelerometer overestimated by a mean of 34.4% the prediction by [Vdot]O₂/HR regression if the intensity of the task was lower than a total of 1000 kcal/shift and underestimated the prediction by a mean of –24.9% if EE estimation of the work shift was higher than a total of 1500 kcal/shift. Despite a high correlation between both methods in the whole group, EE evaluated by accelerometry does not correspond to EE predicted by the [Vdot]O₂/HR regression curves when evaluated individually.     

全站仪和GPS数据格式的转化方法

全站仪和GPS下载的数据,其中大部分都是非DAT数据,而利用全站仪和GPS在野外所采集的数据进行计算机数字制图或测量控制网观测数据的处理时,需要DAT数据文件。在这种情况下,将所下载的非DAT数据文件转换成DAT数据文件,就显得较为重要。针对下载的非DAT格式的数据,利用WORD,EXCEL,CAD等大众化普及软件的某些功能,生成计算机数字制图或测量控制时可以被识别的DAT格式数据文件。该方法操作简单,易于掌握,避免用户开发或编写更复杂的软件和程序。从而达到事半功倍的效果。     

Cost efficiency comparison of four video-based techniques for assessing upper arm postures

Many video-based techniques for assessing postures at work have been developed. Choosing the most appropriate technique should be based on an evaluation of different alternatives in terms of their ability to produce posture information at low input costs, i.e. their cost efficiency. This study compared four video-based techniques for assessing upper arm postures, using cost and error data from an investigation on hairdressers. Labour costs associated with the posture assessments from the video recordings were the dominant factor in the cost efficiency comparison. Thus, a work sampling technique associated with relatively large errors appeared, in general, to be the most cost-efficient because it was labour-saving. Measurement bias and other costs than labour cost for posture assessment influenced the ranking and economic evaluation of techniques, as did the applied measurement strategy, i.e. the numbers of video recordings and repeated assessments of them. PRACTITIONER SUMMARY: The cost efficiency of four video-based techniques for assessing upper arm postures was compared. Work sampling techniques were in general more cost efficient than continuous observations since they were labour-saving. Whilst a labour cost dominated the comparison, 'hidden costs', bias and measurement strategy also influenced this dominance.     

基于虚拟实训基地（车间）的工学结合人才培养模式研究

为了寻求适合自身的人才培养模式,分析了当前国内高等职业教育人才培养模式的现状,提出了基于虚拟实训基地（车间）的工学结合人才培养模式;从校内实训基地建设、课程体系与学习领域开发、教学模式和＂双师型＂教师培养等四个方面阐述了该人才培养模式的具体内容和切实可行性。     

虚拟仪器的网络应用及实现

在研究了LabVIEW 7.0网络通信功能的基础上,利用NI公司的PCI-6111数据采集卡,以ASP为脚本环境、以MySql Server为数据库服务器设计并实现了基于校园网的网络虚拟实验平台.该平台较好地利用了虚拟仪器的网络功能,做到了资源共享,实现了网络远程教育与研究.     

虚拟仪器技术在模拟电子技术实验中的应用

给出了虚拟仪器技术的概念。并提出了一种用于模拟电子技术实验的虚拟仪器设计方案。