飞机座舱航向操纵脚蹬的操纵仿真

要使人体模型能在工程设计中代替人体对设计中的工效提出要求或做出评价 ,就必须将人体模型运动数据与真人实验数据进行比较 ,在两者误差满足工程需要的前提下才可使用。利用美军飞行员人体数据计算人体模型脚行程 ,并与实测值进行比较 ,对所建人体模型脚的可达行程进行了验证。在此基础上利用中国飞行员人体数据 ,得出中国人体模型的脚运动行程 ,在座舱设计中使用。     

Movement Awareness for Ubiquitous Game Control

This paper describes a sensing system for recognising and characterising human movements and its application to ubiquitous gaming. In particular this paper considers the control of computer games through players interacting with the physical environment around them in a natural and appropriate manner. This pushes the interface into the environment, and pulls ubiquitous computing into the game. This is achieved using a sentient computing system. Such a system senses the location, motions, actions and even physiological responses of users. This sensory data can be used to interface and control a game. A good example is 3D first-person games and we demonstrate a system in which actions in the game are mapped to similar actions in the real world. Correspondence to: R. Headon, Laboratory for Communications Engineering, Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK. Email: rph25@cam.ac.uk     

The Well Mannered Wearable Computer

In this paper we describe continuing work being carried out as part of the Bristol Wearable Computing Initiative. We are interested in the use of context sensors to improve the usefulness of wearable computers. A CyberJacket incorporating a Tourist Guide application has been built, and we have experimented with location and movement sensing devices to improve its performance. In particular, we have researched processing techniques for data from accelerometers which enable the wearable computer to determine the user’s activity. We have experimented with, and review, techniques already employed by others; and then propose new methods for analysing the data delivered by these devices. We try to minimise the number of devices needed, and use a single X-Y accelerometer device. Using our techniques we have adapted our CyberJacket and Tourist Guide to include a multimedia presentation which gives the user information using different media depending on the user’s activity as well as location.     

Standardized low-load repetitive work: evidence of different motor control strategies between experienced workers and a reference group

The purpose of this laboratory study was to evaluate the possible differences in motor strategies to a new standardized low-load repetitive work task in between healthy experienced workers and a reference group. Work task event duration, i.e. working rhythm, cutting forces, surface electromyographic (EMG) activity from four shoulder muscles, postural activity, and arm and trunk movements in 3D were recorded during low-load repetitive work simulation. The experienced group showed lower EMG activity and frequency contents (P<0.05), more abducted position of the upper arm and forward flexion of the trunk prior to work simulation (P<0.05), and increased arm and trunk range of motion (P<0.05) compared with the reference group. The results highlight that experienced butchers have a different motor strategy compared with a reference group, i.e. more variable form of coordination pattern. Furthermore, the initial implementation of a possible protective motor strategy by experienced workers might be a very important prognostic factor.     

论中国大学的文化品格追求

从人文品格、科学品格、文化自觉性、创新品格、开放包容品格以及民族精神品格等方面论述了中国大学文化品格追求的方向和途径.认为中国大学应该是中国新时代的表征,其文化追求应该充分反映新时代的精神特质和前进方向.     

一种基于无线局域网的移动检测优化方案

无线局域网采用移动IP实现移动性管理.移动IP切换存在切换时延大,数据包易丢失的问题.切换时延由移动检测时延和注册时延组成,而移动检测时延在其中占主要部分.文章提出了一种移动检测优化方案,采用了自适应绑定的算法,同时充分考虑了域内小范围高频度切换的情况,使移动节点在无线局域网环境中进行快速有效的切换.     

试述“五四”时代特征与现代小说文体的建构

时代特征对文学样式、内容、风格等方面的嬗变有非常大的影响。五四时期,"重估一切价值"的理性精神促成小说观念的变更,"个性解放"与"新文化运动"推动小说内容的重新建构,西方文艺思潮的广泛宣传为现代小说提供了新的表现方式,创作群、读者群、传播媒介的渐趋成熟为现代小说文体的定型提供了保障。     

基于小波分解与运动补偿的弹迹检测方法

基于小波分解与运动补偿的弹迹检测方法,采用多层离散小波分解图像,以低频图像块匹配估计背景运动矢量.再利用差分算法检测射弹,计算出形心坐标并绘出射弹运动轨迹.其实现步骤包括:图像预处理-靶标定位跟踪、原始图像小波多层分解、低频图像块匹配、背景图像运动补偿及射弹检测与空间坐标推断.并以实验验证.     

Extended Fitts' law for 3D pointing tasks using 3D target arrangements

This study explored an extended 3D Fitts' model, which was more appropriate than the original Fitts' model for pointing tasks in 3D environment. The inclination angle and azimuth angle for spherical coordinate system were added to Fitts' original model formulation. Experiments were conducted by manipulating the distance to the target, the size of target, and the 3D target arrangement, which were described using the two angles of inclination (θ1) and azimuth (θ2). Given the starting point as the center of the coordinates, θ1 was the angle between the positive y-axis and the target location, while θ2 was the angle between the positive x-axis and the projected target location on the x–z plane. All four variables were found to be significant for the movement time (MT) (p < 0.0001). After incorporating the two variables, θ1 and θ2, into the original Fitts' model, the extended Fitts' model with 3D target arrangements for spherical coordinate system showed better agreement with the empirical data than previous models in terms of the correlation coefficient and the standard error of the residuals for the measured and predicted MTs.Relevance to industryThis study presents an extended Fitts' model with a higher degree of predictability than previous studies for pointing task in three-dimensional space. In many situations, people implement pointing tasks in a three-dimensional environment, so it is important for designers to predict human performance accurately. Instead of using Euclidean coordinate system, spherical coordinate system can be also used for 3D pointing tasks. The extended model with spherical coordinate system can be used during the design and evaluation stage of the development process to help designers and developers.     

A-SMGCS中的航迹关联设计与实现

针对民航先进场面引导与控制系统(A-SMGCS)下的多传感器航迹关联融合问题,提出一种快速的航迹关联方法.该方法与基于分布式的联邦卡尔曼滤波相结合,构成一种稳定可靠的系统结构,并结合场面监视传感器特性,达到效率与精度的平衡.仿真实验结果表明,该关联方法是有效可行的,且具有较高的精度和处理效率.