一种多功能的栅栏边界安防系统设计

为了降低安防报警系统的不稳定性,提出了一种多功能的综合的栅栏边界安防系统。详细阐述了系统的设计方案、硬件组成和软件设计。该系统由前端监控系统、传输网络和后端监控平台组成。前端监控系统的核心是入侵监控系统,如有报警行为,入侵监控系统的报警器模块利用加速度传感器采集信号后,由单片机控制将报警信息通过传输网络传递到后端监控平台实现报警。系统不仅能够预案报警,还有实时视频监控、电子地图、语音功能、录像回放和远程配置维护等多功能。实验表明该系统工作稳定、可靠,报警率较高,能为安防人员提供及时、准确的信息。     

基于GPRS的远程智能报警系统设计

介绍了1种基于GPRS的远程智能报警系统,给出了系统构成与工作原理,并重点阐述了系统的软、硬件设计。该系统利用GPRS无线数据Modem的数据透明传输功能,以1种实时、可靠的方式实现了对报警终端的远程智能监控。     

基于ZigBee的智能家居安全监控系统研究

为实现对家庭安全的实时监控,设计了智能家居远程安全监控系统。系统基于ZigBee技术和GSM／GPRS网络进行设计,能够通过彩信和短信发出监控图像和报警信息,接收远程指令;同时引入了多种传感器,实现了对家用电器的远程控制,实现了智能家居远程监控。重点阐述了系统的硬件、软件设计以及系统的性能测试,实现了多个监控装置的无线联网。实验结果表明,所设计的系统能够实现安全、便捷的智能家居远程监控,并具有较高的可用性和可靠性。     

一种新型电梯远程监测报警系统

介绍了一种基于GPRS的新型电梯远程监测报警系统,它是由远程数据终端、GPRS数据传输网络、远程监测中心组成。文中对数据采集终端进行了软硬件设计,实现电梯运行状态数据的采集和终端与监测中心的通讯,并采用VisualC＋＋面向对象的编程思想,完成电梯远程监控系统的上位机软件设计,实现电梯运行状态和故障的动态显示,电梯用户信息、故障处理的数据库管理和记录。     

家庭智能安防报警系统的研究

家庭安防系统用于预防盗窃、火灾等意外事件,便于住户迅速采取应急措施,减少财物损失。采用S3C2440处理器,结合GPRS远程通信技术,设计出一种基于ARM9的无线家庭智能安防报警系统。系统将采集信号经调理电路调理后,传输至主控器,根据判断,若有警情,处理器向GPRS模块发送AT指令,用户收到报警短信。同时采用LabVIEW设计上位机界面,对室内温度、烟雾浓度和人员状态进行监测,便于安保人员进行集中监控和管理。     

基于无线VPN的网络图像传输控制系统

本文论述了基于GPRS网络的图像监控终端控制系统.图像监控终端由图像采集控制和图像传输控制两部分组成,通过在单片机系统中嵌入相应的通信协议,经有线网络和无线网络将图像传输至监控中心,最终实现对图像数据进行监控处理.本系统涉及GPRS网络技术、串口RS-232/RS-485传输协议、网络通讯协议、系统抗干扰电路设计等相关技术.     

基于ARM和ZigBee技术的楼宇安防系统的设计

在分析国内外智能楼宇现状及不足的基础上,本文设计了一种基于ARM和ZigBee技术的楼宇安防系统。给出系统结构及工作原理,着重阐述主要硬件及软件的设计。该系统以嵌入式操作系统为核心,采用ZigBee无线通信技术实现信号传输,GPRS通信技术实现系统远程监控。测试结果表明该系统运行稳定、可靠性高、报警迅速、误报率低。将该系统应用于智能楼宇中,能够提高智能楼宇的自动化水平,有助于智能楼宇未来的发展,具有实际应用价值。     

基于GPRS的轨道状态远程监测系统

设计了基于GPRS的轨道状态远程监测系统,详细介绍了系统的组成,通过GPRS模块建立GPRS连接的过程以及通过PPP协议实现数据传送和监控的过程,该系统对于轨道状态远程监控的实现具有实际应用价值.     

嵌入式智能家居安防系统的设计

介绍一种结合嵌入式应用构成的智能家居安防系统,着重介绍系统的硬件和软件设计,以及系统原理和组成,嵌入式（ARM S3C2440）、以太网、GPRS、图像处理、传感与检测技术的应用。本系统具有较好的快速性、稳定性、准确性。系统能够较好的解决家居安全防护的问题。     

基于GPRS的烤房温湿度远程无线报警系统设计

基于GPRS的烤房温湿度远程无线报警系统通过温湿度传感器采集烤房内数据后在单片机设计的控制算法进行内部处理,根据预先设定温度的上下限,通过GPRS模块进行无线数据传输,进行远程监控与预警,检测环境的温湿度是否正常。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.