基于ZigBee的可穿戴式跌倒监护系统

提出了一个可以进行远程报警的无线跌倒监控系统。跌倒检测是通过佩戴在人体的终端设备获取人体运动时产生的加速度信号,然后通过跌倒算法对数据进行处理识别。终端识别跌倒信号后,通过ZigBee无线网络将信号传输到网关,网关通过发送AT指令到SIM300模块来发送报警短信到监护人手机上。实验结果表明,系统可以100%检测到人体跌倒,使医护人员及家属在5s内收到跌倒报警信息。     

基于ZigBee的可穿戴式跌倒监护系统

提出了一个可以进行远程报警的无线跌倒监控系统.跌倒检测是通过佩戴在人体的终端设备获取人体运动时产生的加速度信号,然后通过跌倒算法对数据进行处理识别.终端识别跌倒信号后,通过ZigBee无线网络将信号传输到网关,网关通过发送AT指令到SIM300模块来发送报警短信到监护人手机上.实验结果表明,系统可以100％检测到人体跌倒,使医护人员及家属在5s内收到跌倒报警信息.     

智能家居中老人跌倒远程监护系统的设计

经过对人体跌倒中所经历状态的分析,设计了一种基于检测加速度变化来判断跌倒的远程跌倒报警仪。这种跌倒检测报警仪的工作原理是通过对佩戴人发生跌倒时身体姿态的变化所引起的传感器3个轴上的加速度变化来监测人体是否跌倒。当检测到人体跌倒后,跌倒检测报警仪自身发出声光报警信号,并自动将跌倒报警的信息通过GPRS以短信或拨打电话的方式通知监护人员,同时通过IEEE 802.15.4e无线的方式将报警信息发到智能家居的远程监控网页,进行远程报警提示和报警信息的存储。     

智能家居中老人跌倒远程监护系统的设计与实现

经过对人体跌倒中所经历的状态的分析,设计了一种基于检测加速度变化来判断跌倒的远程跌倒报警仪。这种跌倒检测报警仪的工作原理是通过对佩戴人发生跌倒时身体姿态的变化所引起的传感器的三个轴上的加速度的变化来监测人体是否跌倒。当检测到人体跌倒后,跌倒检测报警仪自身发出声光报警信号,并自动将跌倒报警的信息通过GPRS以短信或拨打对方电话的方式通知监护人员,同时通过IEEE 802.15.4E无线的方式将报警信息发到智能家居的远程监控网页进行远程报警提示和报警信息的存储。     

基于GPRS的远程安防监控系统的研究和设计

设计一种以$3C2410为硬件平台和嵌入式Linux为软件平台,基于M35GPRS模块的远程安防监控系统,整个系统围绕图像的采集,传输和显示进行了探讨,阐述了远程安防监控系统中的软硬件处理技术。测试结果表明,该远程安防监控系统具有监控温度,实时传输视频流,通过网页远程控制监控机动作,短信服务和报警等功能。与已有系统相比,该系统把Web服务器和CGI应用到监控机和网页的交互,真正实现了对监控端的远程控制。     

智能安防管理系统的设计与实现

运用TCP/IP的通信技术、嵌入式系统、视频编解码、GSM远程通信技术等设计并实现了集安防终端主机监控报警、安防探头监控、远程监控报警等功能一体的一种智能安防管理系统,给出了系统组成框图及其实现方案。经过实际应用检测,该系统性能可靠、易于使用,有效地实现了快速报警、处警,远程监控功能,提高了安全防护水平,具有广泛的实用价值。     

一种基于单片机的移动目标监控系统研究

针对目前大部分监控系统对移动目标物的监控要求越来越高,设计了一款基于单片机的嵌入式移动目标监控系统。系统以目前功能强大的AT89S52单片机为核心,采用适合人体视觉特性的Itti模型来处理拍摄到的视频图像。从视频图像颜色特征图与亮度特征图两方面来对采集到的图像进行检测与分割构成图像显著图,根据移动目标物质心的变化来跟踪图像。仿真表明,该系统能有效监控与锁定目标物,具有较强的自适应性。     

基于OpenCV的老人跌倒检测的设计和实现

当今社会空巢老人的数量逐渐增多,老人跌倒发生率也相应增加,这已成为一个严重的社会问题。基于计算机视觉的老人跌倒检测的研究具有重要意义,文中提出了一种全新的老人跌倒检测方案。首先利用背景差分法提取监控视频中的运动目标图像轮廓,然后提取运动目标的特征信息。没有使用传统的直方图和椭圆形来表示人体轮廓,而是把直方图分为三个区域,分别计算出三个区域的重心,然后根据这三点的信息提取出运动目标的特征,根据特征信息的变化来检测是否发生跌倒。实验结果表明,该方案在保证较高准确率的前提下,计算复杂度大幅度下降,能达到较好的识别效果。     

基于ARM的嵌入式智能视频监控系统设计

针对传统PC远程监控系统的一些不足,提出了一种前端具有预处理功能的嵌入式智能视频监控系统设计方案,通过测试,该系统视频目标检测精度较高,能够满足实时监控及智能检测需求,实现了预期设计要求。     

基于轻量化Openpose的跌倒算法识别研究

目前,留守居家老人因为跌倒而意外事故频发,普通的视频监控时效性差。因此,文章提出了一种基于轻量化Openpose结合图像分类的方法,该方法通过轻量化Openpose对视频流进行骨骼图像提取,中间通过对获取的图像进行姿态标注,后期再通过自定义轻量化分类网络MobileNet模型对标注图像进行分类训练,即可实现实时的姿态获取,以检测跌倒行为的发生。     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.