浅谈新疆某水库闸门集中控制系统

新疆某水库泄洪闸门集控系统是以美国Wonderware公司的Intouch 10.1系统监控软件为开发平台所建立的一套集远程监控和远程操作为一体的闸门控制系统。该系统上位机通过局域网与各闸门控制系统的PLC进行通讯,包括上送各种信息和接受控制命令,通讯采用标准以太网,支持TCP/IP协议,系统建立于2011年6月,经过1年多的操作运行,情况良好。     

A medical hand tool physical interaction evaluation approach for prototype testing using patient care simulators

The purpose of this study was to develop and test a physical ergonomics assessment approach for medical device handles. The method assesses wrist posture and force of exertion simultaneously by task element. Electrogoniometers and EMG sensors were connected through a data acquisition module for synchronization with video recordings of trials. Task analysis of video recordings were performed offline with Observer XT software. Average posture and force data across several repetitions of individual task elements were calculated and presented in a format suitable for informing product designers of specific issues during a test trial. A handle comfort questionnaire is proposed to survey subjective responses. The evaluation approach was applied to an endoscope needle in sampling a biopsy from the stomach wall using a gastrointestinal track simulator with ten physician surrogates. The results showed that for all task elements the wrist was in extension (33(°)-45(°)). Peak muscle forces ranged from 28% to 68% MVC across the three muscles studied. Muscle peak forces were above ACGIH HAL maximum threshold limits for four of the seven task elements, and above the action limit for all seven task elements for two muscles. The handle comfort questionnaire data also supported the high muscle force findings, and also on force distribution on the handle due to contact stresses. This combined approach could be used to collect and report detailed early stage ergonomics data from user trials on patient care simulators. The approach is proposed for use by medical device designers at the design stage of new products using prototypes, but it could also be used on existing products with real patients.     

Decrease of force capabilities as an index of upper limb fatigue

The aim of the study was to assess upper limb fatigue on the basis of the force change index (FCI), which expresses changes in developed force, and to demonstrate that this index differentiates muscle fatigue of the upper limb depending on external load. The study was performed on ten young men in 12 conditions of external load. Ten conditions characterized repetitive work in a two-period cycle, in which both or one of the periods were loaded, and two conditions characterized continuous work with constant load. The participants tried to maintain hand-grip force at an imposed level during a determined time in the standard upper limb posture. Changes in values of recorded force exerted during successive cycles were approximated by a regression function. In most cases there was a strong correlation between the measurement data and the logarithmic regression curve. However, several cases of lower external load showed absence of such correlation. In 75% of the cases, there were statistically significant differences between the values of FCI calculated for individual conditions of external load. That means that FCI not only expresses muscle fatigue quantitatively but also points to the differences in upper limb fatigue resulting from differences in the external load. The study results have shown that the developed index (FCI) can be applied for fatigue assessment and discrimination with a more sophisticated model of a repetitive task than just a simple two-period work and rest model.     

系数可变号的非线性偏差分方程ω度频密振动解

对一类带有可变号系数的非线性偏差分方程的ω度频密振动性问题进行了研究,提出了此类偏差分方程的上/下度ω频密振动性准则.依据无穷双序列的频密测度概念及其性质,深入讨论了此类偏差分方程.仅仅利用方程的系数数列的水平集"频率测度"概念,给出了此类偏差分方程解的上/下度ω频密振动的充分条件,并且准确刻画了解的振动频率.     

人体上肢运动对服装袖型松量设计的影响分析

为了解决服装袖型松量设计与人体上肢运动关系的问题,结合人体上肢的形态结构及几种常规运动,重点测量了7种人体上肢运动状态下的人体上肢各个部位的尺寸变化,结合衣袖结构设计的相关理论,对人体上肢尺寸变化情况的数据进行了分析,得出了与各种上肢运动状态对应的袖型松量设计的基本要求,进而分析了人体上肢运动对服装袖型松量设计的影响.     

基于取整划分函数的k 匿名算法

提出一种基于取整划分函数的k匿名算法,并从理论上证明该算法在非平凡的数据集中可以取得更低的上界.特别地,当数据集大于2k2时,该算法产生的匿名化数据的匿名组规模的上界为k+1;而当待发布数据表足够大时,算法所生成的所有匿名组的平均规模将足够趋近于k.仿真实验结果表明,该算法是有效而可行的.     

Social class, child age, and parental socialization values.

Upper-, middle-, and lower-class parents were asked to explain a proverb which had both "growth" and "stability" interpretations to their 11- and 16-yr-old sons. The growth interpretation was overwhelmingly endorsed by most parents. With 16-yr-olds, lower-middle-class parents continued to endorse the growth interpretation; most upper-class parents endorsed the stability interpretation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

四阶非线性边值问题解的单调迭代方法

通过上下解的单调迭代方法,讨论了四阶常微分方程u(4)(t)=f(t,u,u′,u″,u),t∈[0,1],u(0)=u′(1)=u″(0)=u(1)=0,的边值问题,获得了解的存在性结果,推广了已有的结果.并用一实例,说明其应用.     

高坝洲升船机计算机监控系统上位机系统设计与实现

高坝洲升船机计算机监控系统由现地控制单元、通信网络和上位监控主机3部分构成。文中在简要介绍各部分的组成后，着重介绍了上位机系统的功能设计和实现方法。上位机系统具有访问权限设置及安全闭锁、升船机系统运行监控与仿真、数据采集与数据库管理、故障报警与事故追忆、报表管理及打印、机构动作超时保护、专家提示及事故指导等功能。最后介绍了计算机监控系统网络调试方法。