ERGONOMICS RESEARCH SOCIETY THE SOCIETY'S LECTURE, 1964.

Eight male volnntours, aged 20 to 43 yr, participated in a 1 min run to exhaustion. Six of the subjects had experienced work on the treadmill and ran regularly during the year. By means of a preliminary rim a work load was selected for each subject which would produce exhaustion in 60 sec. The speed of the treadmill was 12.8 kph for all runs except one (14.5 kph) and grade varied from 10 to 20%. The warm up consisted of walking 5.6 kph at a 10% grade for min and preceded the rim by 3 or 5 min. Oxygen consumption ([Vdot]o₂), heart rate (HR), and respiration rate (f) were recorded every 15 sec during the run and during the first 30 sec of recovery. Thereafter, recovory measurements were made during progressively longer intervals for a total of 30 min. [Vdot]0₃, during the run with warm up (2.69± 0.39 L) was significantly greater (p<0.05) than without warm up (2.50±0.41 L). Recovory [Vdot]o₃ and total [Vdot]o₂ (run plus recovory) were not significantly different between the warm up and without warm up runs. The results were not different when net [Vdot]o₂ ([Vdot]o₂minus rest [Vdot]o₃) was compared. A significant increase in heart rate was achieved during rutis with warm up compared to no warm up. Respiration rates were also increased with warm up but not significantly. The conclusion was that under the conditions of this study, warm up is of energetic benefit in preparing for a short exhaustive run.     

无尺度网络上的蠕虫传播行为研究

许多网络如因特网、人类间的社会关系和物种之间的食物链网络等，都是无尺度网络。研究无尺度网络，对于防范黑客攻击、防治蠕虫的传播等都具有重要的意义．本文对随机网络和无尺度网络做了比较．重点介绍无尺度网络上蠕虫传播行为的特性——阈值和强韧性，最后指出了蠕虫防治的方法。     

对《电子签名法》应用问题的探析

《电子签名法》已经实施两年多,针对实施过程,重点从电子认证服务提供者和电子签名使用者两个方面加以剖析,找出其存在的成本、互通性、监管部门交叉、安全标准、使用环境、人们对电子签名认知程度等实际问题,以期今后有关部门能逐渐解决,为电子签名的发展扫清障碍。     

基于空域法的UCAV群目标编群策略研究

随着空战环境和任务的复杂化,无人作战飞机开始从单个应用转向集群式应用,目标编群是UCAV群协同作战的首要条件。本文提出了基于空域法的目标编群策略,设计了目标编群的算法。仿真结果表明:基于空域法的编群策略能很好地适应空战中态势的变化,较好地获取目标的群数。     

Evaluation of fitting of plastic parts

Abstract

As an example of measurement by touch, fitting of plastic parts was studied. Where such requirement is dependent on judgement made by human senses, a number of characteristics must be measured in order to obtain the mechanical characteristics matching those of touch. The degree of fitting judged by touch is quantified by multidimensional scaling, using capsule-shaped plastic parts. Also, the dimensions, shapes and the degree of mechanical fitting are measured and the relationships of these to the quantified senses determined by factor analysis, multivariate data analysis being effective for this purpose.     

结合Cannikin’s Law的离线数据增广方法研究

数据增广是提升深度学习模型性能的有效方法之一。针对多类别目标检测任务中检测性能不平衡问题,提出一种针对“短板类别”（检测性能远低于模型平均检测性能的类别）的离线数据增广方法。受Cannikin’s Law的启发,采用基于复制粘贴（copy-paste）机制的场景多样性增广方法。随机采集训练集中“短板类别”实例区域,通过相似性度量机制选取训练集中增广目标样本进行随机粘贴。为了降低随机粘贴导致的遮挡问题,采用基于自遮挡（cut-replace）机制的增广方法提升模型遮挡表达能力。通过截取样本自身区域,对特征表达最显著区域进行遮挡。实验表明,FCOS目标检测框架在PASCAL VOC数据上的平均检测精度（mean average precision,mAP）从79.10%提升到83.90%,其中短板类别更为显著,提升了20.8个百分点。在MS-COCO数据上平均检测精度提升了0.9个百分点。     

关于无标度网络中Hub节点的研究

无标度网络中少量节点的连接数非常大(称为Hub节点),而大量节点的连接数则非常少。通过理论和仿真两方面的研究,发现复杂网络中Hub节点的度值、数量与度分布指数具有直接关系。研究表明,度分布指数等于2是无标度网络中度分布指数的一个临界值。     

Study on Guidance Law of UAV Net Recovery System

The design and realization of a net recovery system is introduced, which can recover UAV （unmanned aerial vehicle） reliably and safely. The mathematical model is built, and the horizontal and vertical guidance law is studied based on the aerodynamic parameters and actual flying trial data of a certain UAV. The simulation result shows that this system can realize the recovery safely, stably and accurately.     

Optimum PN Guidance Law for Maneuvering Target

An optimum PN guidance law for maneuvering target is developed using optimal control theory. By estimating the target position and setting the cost function, the guidance law can be deduced even without knowing the missile lateral acceleration. Since the quadratic cost function can make a compromise between the miss distance andthe control constraint, the optimum guidance law obtained is more general. Also, introduced line of sight rate as the input, a practical form of this guidance law is derived. The simulation results show the effectiveness of the guidance laws.     

基于Matlab／Simulink的无人机飞行仿真研究

该文以某小型无人机为研究对象,基于其数学模型,在Matlab／Simulink环境下并结合Stateflow的有限状态机实现了对该无人机飞行过程的仿真模拟。首先利用Matlab／Simulink,对小型无人机搭建了非线性数学模型,对其飞行控制律进行了研究;然后利用Stateflow模拟了无人机的飞行管理器,实现无人机多模态之间的转换;最后对无人机的控制规律进行了验证。其结果表明了该控制规律的合理性和有效性。