面向人体呼吸心跳同时监测的雷达信号处理方法综述

利用雷达同时监测人体呼吸和心跳具有非接触、高隐私等优势,已成为当前国内外研究的热点之一。面向人体呼吸心跳同时监测场景,分析了不同类型的雷达系统工作原理,总结了在人体信号检测中的雷达数据预处理、呼吸和心跳信号分离以及呼吸率和心率估计的信号处理方法,指出了相关研究发展趋势。     

SJ-10卫星导线特性箱实验装置研制

为了研究微重力条件下导线绝缘层着火先期征兆和着火早期烟的析出和烟气流动规律,研制了SJ-10卫星导线特性箱有效载荷实验装置。该装置可实现对导线的恒流过载加热,并采用先进的测试技术,获得导线着火先期征兆和烟气浓度分布。地面验证实验表明,该装置安全可靠,同时能充分利用空间实验能力,保障科学目标的实现。     

REAL ROOT ISOLATION OF SPLINE FUNCTIONS

In this paper, we propose an algorithm for isolating real roots of a given univariate spline function, which is based on the use of Descartes＇ rule of signs and de Casteljau algorithm. Numerical examples illustrate the flexibility and effectiveness of the algorithm.     

Ultrafine microstructures make superhard materials harder

<正>As advanced tool materials,diamond and cubic boron nitride(cBN)play a vital role in the modern processing industry.Nonetheless,each material has some intrinsic drawbacks,such as the inferior thermal stability of diamond and the relatively low hardness and toughness of cBN.A simul-     

NMR artifacts caused by decoupling of multiple‐spin coherences: improved SLAP experiment

Contrary to common expectations, multiple‐spin coherences containing products of proton and heteronucleus operators (e.g. H_uC_x, u = x, y, z) can produce not only sidebands but also noticeable centerband NMR signals of the heteronucleus during acquisition under ¹H broadband decoupling. Such centerband signals of low abundant heteronuclei can be sources of relatively strong unexpected artifacts in NMR experiments that aim to detect very weak signals from much less‐abundant isotopomers, e.g. ¹³C–¹³C ones. These findings lead to a new design of Sign Labeled Polarization Transfer (SLAP) pulse sequence (MSS‐SLAP) with improved suppression of centerband peaks that are because of singly, e.g. ¹³C, labeled molecules (parent peaks). The MSS‐SLAP experiment and its MSS‐BIRD‐SLAP variant are compared with a few older SLAP versions. Copyright © 2015 John Wiley & Sons, Ltd.     

基于四旋翼无人机的人员体征监测系统

研究了一种全新的生命体征监测系统,为野外活动人员提供快速的救援保障。系统整合四旋翼无人机、摄像头、无线基站、测控站、监控终端和生命体征检测设备,在四旋翼无人机上安装无线基站,实现无线监测所有队员的生命体征信息和现场情况。基站安装在无人机上,不受地形的影响,解决了传统地面安装基站的局限性,并提高了无线信号的覆盖范围。     

基于自相关功率谱的生命迹象探测算法

在实际雷达生命迹象探测环境中,干扰噪声往往不是理想的高斯白噪声,而是非零均值、且具有相关性的高斯状色噪声。针对互功率谱算法在非理想高斯白噪声背景下提高信噪比能力有限这一问题,通过对其不足与缺陷的分析,提出一种在高斯状色噪声条件下,应用于步进频连续波生命探测雷达,基于自相关功率谱的生命迹象探测算法。该算法利用源目标回波信号的自相关性,对基带回波信号进行自相关处理,以此增强源目标信号功率谱密度,提高信噪比,提升探测性能。通过仿真,证明了该算法提升信噪比能力。同时利用步进频连续波生命探测雷达进行实际测试,统计、分析了探测环境中的噪声模型与数字特征,验证了自相关功率谱在实际探测环境中,具有更强的生命迹象检测性能。     

基于ZigBee的养老院医疗监护系统的设计

本文针对养老院老人的监护需求,设计了一种基于ZigBee的养老院医疗监护系统,同时介绍了该系统的软件设计和硬件设计。该系统以ZigBee网络为载体建立无线医疗监护网络,采集老人的生命体征数据,并通过上位机软件进行监测与分析。在发生危机情况时,系统可以通过GSM网络向医院发出急救信号。实验表明,该系统可以有效提高养老院的监护水平。     

FBG-based smart bed system for healthcare applications

This paper presents a smart fiber Bragg grating (FBG) sensor system with an unobtrusive and easy-to-use FBG sensor bed, which automatically monitors the behavior of bedridden patients and their vital signs based on indicative spatio-temporal signature for adaptive intervention triggering and activity planning. We present the subtle design, fabrication, calibration, implementation and deployment issues of the FBG pressure sensors to be used in hospitals or nursing homes to prevent bedsore generation, patient falling out of the bed, and life-threatening situations such as patient's heart rate weakening, breathing pattern change, etc. Through trials conducted in the laboratory for respiratory rate monitoring with a sample group of 10 subjects, the system showed maximum error of ± 1 breaths per minute as compared to manual counting.