基于组态软件的PLC液体混合装置监控系统的设计

本文应用组态软件实现了虚拟液体混合装置的监控系统,介绍了组态软件在PLC控制系统上的应用。阐述了组态软件实现系统运行仿真效果的方法和技巧。现场运行情况表明,系统能够安全平稳的运行。     

广播电视系统监测与网络安全技术的研究

广播电视系统的监测与网络安全技术在应用过程中,会从根本上影响广播电视系统的运行状态,所以需要保证该项技术能正常稳定运行。基于对广播电视系统监测和网络安全技术构建形式、运行原理等内容的研究和分析,笔者提出了这类技术的应用方法,以保证广播电视系统能正常稳定运行,提高系统的运行质量。     

应用系统运行状态监管的设计与开发

通过实际需求分析及相关技术的分析,提出了＂以应用系统为主体的监管技术设计思路＂,并采用WMI、Windows API技术、数据库技术,通过构建分布式的运行监控模式,实现了监控系统对应用系统运行状态的全面监控。经过机房的实际运行,获取了真实的监控数据,并可以直观的用于应用系统运行问题的解决及预测判断。     

基于Windows系统级服务的客户端软件互控技术实现方法

在C/S结构应用系统中,有效安全地运行客户端的应用程序是实现C/S结构应用系统的基础,通过分析Windows系统的特点,引入系统级服务进程实现对客户端应用的监控确保了客户端程序被强行结束或绕开运行,再利用已经运行的客户端应用程序反过来实现对系统级服务进程进行监控,从而确保了客户端应用程序的有效运行和工作.     

网络工程中数据库应用系统设计技术

当前网络工程中的数据库应用系统都不同程度地存在着运行效率不高的缺点。本文基于我们近几年来在网络工程数据库应用系统开发方面的研究工作,提出了网络工程数据库应用系统设计技术,以求在实际应用中,较好地提高网络数据库应用系统的运行效率。     

遥感卫星地面站业务运行管理系统模型和流程设计方法

业务运行管理系统是遥感卫星地面系统业务运行的组织和管理中心,但是不同的遥感卫星地面系统因其业务和功能设置不同,其业务运行管理系统在设计上也千差万别。本文分析了业务运行管理系统的特点、国内各个遥感卫星地面应用系统业务运行与管理的共性与特性,设计了一种具有树状层次结构的适合多种遥感卫星地面系统业务运行管理的通用业务模型,并且引入了面向对象技术进行业务运行管理系统的流程设计。该业务模型和系统流程设计方法兼具通用性和可扩展性,既能够适应不同的遥感卫星地面应用系统的业务运行管理系统的设计与实现,又能够通过灵活配置与扩展,在设计和实现中适应业务不同的需求和业务种类的变化。     

基于Unity3D的卫星运行可视化系统设计与实现

在航天工程中,人造卫星有着十分广泛的用途,比如导航定位、通信、科研及军事等应用。而人造卫星的这些应用往往离不开卫星状态的各个参数数据,其中卫星的运行轨道和运行姿态是决定卫星应用功能的两个主要因素,是卫星系统工程设计的重要组成部分。因此,本文应用可视化技术,设计出了一套基于Unity3D的卫星运行可视化系统。该系统可以实时显示卫星轨道运行的全过程,为卫星实时管理提供了重要的辅助决策。     

计算机应用系统的安全运行分析

随着信息时代的发展,计算机应用得到很大的推进,随之而来的是计算机应用系统的安全问题,为保障计算机应用系统的效率,需具备安全运行的能力。安全运行是计算机应用系统的基础,采取安全管理的措施,才能完善计算机系统的应用。因此,本文以计算机应用系统为研究对象,着重分析安全运行。     

面向体系结构的可视化服务集成开发环境Artemis-VIDE

为支持直观易扩展的软件服务集成和所集成之应用系统的动态演化,本文提出了一个面向体系结构的可视化服务集成开发环境。该环境支持以图形化的方式定义系统的软件体系结构及相关协同逻辑,并据此生成内置于应用系统之中的运行时刻体系结构对象,作为应用系统运行和演化的基础。该环境还集成了服务搜索、基于图文法的体系结构检查等功能,为系统的开发、运行、监控和动态演化提供了一个一致、易用、可扩展的支撑平台。     

基于嵌入式系统的水泵自动控制系统在东庞煤矿的应用

详细介绍了基于嵌入式系统的水泵自动控制系统的结构、功能和特点及其在东庞煤矿深部泵房的应用。该系统实现了水泵多种控制模式下的运行。实际应用表明,该系统运行操作简单方便、稳定可靠、数据实时性高、维护量小,达到了减员增效的目的。     

A method of defuzzification based on the approach of areas' ratio

The new method of defuzzification of output parameters from the base of fuzzy rules for a Mamdani fuzzy controller is given in the paper. The peculiarity of the method is the usage of the universal equation for the area computation of the geometric shapes. During the realization of fuzzy inference linguistic terms, the structure changes from the triangular into a trapezoidal shape. That is why the universal equation is used. The method is limited and can be used only for the triangular and trapezoidal membership functions. Gaussian functions can also be used while modifying the proposed method. Traditional defuzzification models such as Middle of Maxima − MoM, First of Maxima − FoM, Last of Maxima − LoM, First of Suppport − FoS, Last of Support − LoS, Middle of Support − MoS, Center of Sums − CoS, Model of Height − MoH have a number of systematic errors: curse of dimensionality, partition of unity condition and absence of additivity. The above-mentioned methods can be seen as Center of Gravity − CoG, which has the same errors. These errors lead to the fact that accuracy of fuzzy systems decreases, because during the training root mean square error increases. One of the reasons that provokes the errors is that some of the activated fuzzy rules are excluded from the fuzzy inference. It is also possible to increase the accuracy of the fuzzy system through properties of continuity. The proposed method guarantees fulfilling of the property of continuity, as the intersection point of the adjustment linguistic terms equals 0.5 when a parametrized membership function is used. The causes of errors and a way to delete them are reviewed in the paper. The proposed method excludes errors which are inherent to the traditional and non- traditional models of defuzzification. Comparative analysis of the proposed method of defuzzification with traditional and non-traditional models shows its effectiveness.     

An approach to the synthesis of fuzzy stabilization systems with a priori unknown model of an object

A method of synthesis of fuzzy stabilization systems for a broad class of dynamic objects under the assumption that the mathematical model of the object is not known a priori is proposed. The control is formulated in the form of a proportional law of adjustment as a function of a macro-variable; the square of the Euclidean norm of the phase variables is adopted as the macro-variable. An analogous variable characterizes the distance of the object from the equilibrium position. Despite the simplicity of the control law, its sign remains constant due to the fact that the macro-variable is positive-definite over the entire phase space. The switching times of the signals are determined by fuzzy identification of the system’s dynamic modes on the basis of measurement of the derivatives of the macro-variable.     

Remote sensing of spring phenology in boreal regions: A free of snow-effect method using NOAA-AVHRR and SPOT-VGT data (1982-2004)

Measurements of spring phenological dates in boreal regions using NDVI can be affected by snowmelt. This impacts the analysis of interannual variations in phenology and the estimates of annual carbon fluxes. For these two objectives, snowmelt effect must be removed from the phenological detection. We propose a methodology for determining the date of onset of greening in the 1982-2004 period using SPOT-VEGETATION (VGT) and NOAA Advanced Very High Resolution Radiometer (AVHRR) data. From 1998 onwards, the date of onset of greening is taken as the date at which the Normalized Difference Water Index (NDWI), calculated from SPOT-VGT near and short-wave infrared bands, starts increasing. This index decreases with snowmelt but increases with vegetation greening. For the 1982-2001 period, the date of onset of greening is the date at which AVHRR-NDVI equals a pixel specific threshold (PST), determined using the results of the NDWI method in the years common to the two datasets. The methods are validated using in situ measurements of the dates of leaf appearance. RMSE of 6.7 and 7.8 days, respectively, is found using NDWI-VGT and PST-NOAA methodologies, and the difference between the two methodologies in the common years is small. Very importantly, the dates are not biased. The interannual variations of the 23-year spring phenology dataset on the study area in northern Eurasia are analysed. In average over the study area, an advance of 8 days and a delay of 3.6 days are, respectively, found over the periods 1982-1991 and 1993-2004. These results confirm and complete previous studies about the greening trend, remove the uncertainty due to snow, and may improve carbon budget calculations.     

3 Laser transmission joining in microtechnology

The laser is a joining tool which is particularly suitable for the application in microtechnology. The process variant laser transmission joining can be used both for welding thermoplastics and bonding of silicon and glass. The investigations presented in this paper cover detailed examinations of both processes. Concerning laser transmission welding of plastics it is examined how far the content of carbon black in the material influences the formation of the weld seam. It is shown that the optical depth of penetration, the weld seam width as well as the formation of the weld morphology differ with varying content of carbon black. Selective laser radiation bonding (SLB) is a novel method for joining silicon and glass based on the transmission heating of the interface of both joining partners and the thermo-chemical principles of silicon direct bonding. SLB shows advantages in reference to the thermal load of sensitive components like sensors and to the selectivity of the joining geometry. In this study the principle method of SLB and the latest advances like the integration of the thermal process control in the laser processing head will be presented. Also experimental test results of the process with constant laser power and thermal process control and the comparison of them will be shown.An erratum to this article can be found at     

Complement of Source Equation of Elastic Line

A new notion of joint, defined in terms of the state of motor (active or locked) and type of the elastic or rigid element, gear and/or link that follows after the motor, is introduced. Special attention is paid to the motion of the flexible links in the robotic configuration. The paper deals with the relationship between the equation of elastic line equilibrium, the “Euler–Bernoulli approach” (EBA), and equation of motion at the point of elastic line tip, the “Lumped-mass approach” (LMA). The Euler–Bernoulli equations (which have for a long time been used in the literature) should be expanded according to the requirements of the motion complexity of elastic robotic systems. The Euler–Bernoulli equation (based on the known laws of dynamics) should be supplemented with all the forces that are participating in the formation of the elasticity moment of the considered mode. This yields the difference in the structure of Euler–Bernoulli equations for each mode. The stiffness matrix is a full matrix. Mathematical model of the actuators also comprises coupling between elasticity forces. Particular integral of Daniel Bernoulli should be supplemented with the stationary character of elastic deformation of any point of the considered mode, caused by the present forces. General form of the elastic line is a direct outcome of the system motion dynamics, and cannot be described by one scalar equation but by three equations for position and three equations for orientation of every point on that elastic line. The choice of reference trajectory is analyzed. Simulation results are shown for a selected robotic example involving the simultaneous presence of elasticity of the gear and of the link (two modes), as well as the environment force dynamics.     

基于Android 平台的工程图学助教助学系统研究与实现

针对空间想象能力培养的教学需要,对基于Android 平台的工程图学助教助学系统 进行了研究。根据教与学的需要,确定了系统功能,设计了软件的框架结构。分析研究了移动设 备的系统平台,选择了系统的开发及运行平台。通过分析Android 框架中OpenGL ES 的设计接口, 实现了模型的轴测显示模式。通过分析OpenGL ES 中glDrawElements 方法的数据需求和VRML97 的数据格式,设计了虚拟模型加载器,实现了Android 系统中的VRML 模型3D 浏览器。开发了 软件的核心功能模块,设计实现了基于Android 平台的工程图学助教助学系统。该系统因其创新 性和实用性,在2014 年第十四届全国多媒体课件大赛中荣获一等奖。     

协作机器人的构型分析研究

针对协作机器人的构型分析研究,得出了偏置是影响机器人构型的一个重要因素。首先,对现有典型协作机器人的构型进行分析,通过构型间的内在联系与演化过程得到构型之间的差异。然后利用构型之间的差异引出了偏置的定义,并通过偏置对关节运动范围的影响将其分为S型偏置和Y型偏置。最后以全局性能指标、工作空间体积指标和灵活工作空间指标为性能评价标准,对iiwa、Sawyer、Yumi三种典型构型的性能进行了仿真。通过对比分析可知,偏置的存在使构型的全局性能和工作空间体积性能降低,但对灵活工作空间性能有提高作用。结果表明偏置是影响机器人性能的重要因素,该分析研究为协作机器人的构型设计提供了理论依据。     

Stereometric pattern recognition by artificial touch

An artificial touch perception system has been created in order to study a method of processing information obtainable through tactile exploration of three-dimensional forms. The results can be useful for several purposes.The first part of the work concerns the project of the tactile explorator. For this purpose we used a kind of artificial limb like a finger with a certain number of touch sensitive transducers distributed along the surface of the finger tip. The information received by touching the object with the finger, is successively utilized as the input of the control servosystem which moves the finger point-by-point along the object surface in order to proceed with the exploration. It must be noticed that, from a philosophical point-of-view, the parallel approach with more fingers touching simultaneously the object in several points, is equal to sequential touching of these points by one moving finger.The second part describes the use of the propositional calculus in logical classification of the objects, as a method of three-dimensional pattern recognition.Elaboration of the input data obtained by tactile exploration, and computation of characteristic geometrical features of three-dimensional forms, has been performed on computer.     

Innovative uses of ICT in Chilean schools

Abstract This paper presents some of the results of the study of seven cases of innovative pedagogical practices using ICT. The study was performed in the framework of the application of SITES M2 in Chile. The results are divided in two sections. First is a summary of each case, highlighting its innovative characteristics that serve as models of 'good practice' for Chilean teachers. Second, the results of the analysis of what teachers did are outlined; the impact on students and the type of teaching and learning activities in use. Results show that these projects did not provide evidence of having impact on students' learning as defined in the national curriculum. However, they show that students participating in these projects could learn other things, had the opportunity to develop abilities defined as cross-curricular and practised ICT related skills. The analysis of the teaching and learning activities highlights some deficiencies in the way that teachers implement new teaching strategies.