双槽电化学腐蚀法制备介孔硅的热导率

提出了一个基于有效介质理论分析介孔硅层传热机理的理论模型,对影响介孔硅有效热导率的因素包括孔隙率、硅的恒容热容和硅的声子平均自由程进行了理论分析,得出用于计算介孔硅有效热导率的计算公式.采用双槽电化学腐蚀法制备孔隙率分别为62%和79%的介孔硅,微喇曼光谱技术测量所制备的介孔硅的热导率为8.315和0.949W/(m·K).SEM分析表明,孔隙率为62%和79%的介孔硅的平均特征尺寸分别为10nm和5nm.应用计算介孔硅有效热导率的公式,得到孔隙率为62%,平均特征尺寸为10nm和孔隙率为79%,平均特征尺寸为5nm的介孔硅层的有效热导率理论值为10.753和1.035W/(m·K).研究分析表明,理论计算与所获得的实验数据一致.介孔硅极低的热导率使其作为一种良好的热绝缘材料有望广泛应用于微传感器和微电子机械系统中.     

女性健康类智能可穿戴设备现状与发展趋势

概述女性健康类智能可穿戴设备的开发现状,将现有产品分为女性健康监测类、女性养生保健类和女性安全防护类智能可穿戴设备。分别对各类女性健康类智能可穿戴设备的开发及应用现状进行总结,分析各类智能可穿戴设备在设计研究和应用中待解决的问题。最后指出女性健康类智能可穿戴设备的发展趋势,包括更准确地监测、更安全的操作、更舒适的体验、更时尚的外观。该研究对女性健康类智能可穿戴设备的研发具有一定的参考作用。     

支持云服务高性价比可穿戴设备的设计研究

为了有效地提高可穿戴设备使用者的可操作性和扩展性,研究设计一种多传感器、支持云端服务、低成本的可穿戴系统设备.该设备包括微控制器Arduino Uno和5个传感器,传感器分别为心率传感器、呼吸传感器、应激焦虑传感器、体温传感器和血糖传感器.传感器通过MQTT协议,将监控到的身体属性数据实时发送到应用程序,并存储于云端以...     

基于函数型数据时间序列建模的单传感器日常行为识别

在基于惯性传感器的人体行为识别中,传统算法常忽略行为的周期性与时序性,对提取特征的滑动窗口大小也有相应要求.文中基于单个腰部传感器分析人体日常行为,提出面向周期行为的函数型数据分析方法和隐马尔可夫模型结合的行为识别算法.首先,使用函数型数据分析方法,拟合周期性日常行为的动作捕捉数据,提取拟合后的单个周期数据.然后基于此周期时间序列数据建立描述各个日常行为过程的隐马尔可夫模型.最后,使用最大似然估计判别行为,得到识别结果.该算法通过单个腰部传感器即可快速有效地识别8种日常行为,在基于用户依赖策略和用户独立策略时识别率较高.     

可穿戴膝关节外骨骼结构设计与运动分析

机械外骨骼是模仿生物界外骨骼研发的一种新型机电装置。设计了一款可穿戴式柔性膝关节外骨骼,采用人体下肢5杆简化模型进行运动学和动力学分析。通过Matlab/Simulink仿真分析,所得的膝关节角度变化曲线与CGA标准曲线基本一致,验证了数学模型的正确性;通过ADAMS动态仿真,模型能正常行走,验证了驱动函数的正确性,所得的膝关节力矩变化曲线,为后面的控制做准备。研制了相关样机,通过穿外骨骼和不穿外骨骼进行对比试验,观察膝关节角度的变化情况,验证该机构的合理性。     

移动代理在可穿戴计算机数据处理中的应用

计算能力的便携化已成为微小型计算机的发展趋势之一,人们期望能够随时随地对主动和被动数据进行处理。可穿戴计算机为满足这种无处不在的计算提供了硬件可能,对其软件的研究主要分为无线网络包括单跳和多跳网络的底层通信机制和基于其上的计算模式如移动代理和远程过程求值等。文章介绍了移动计算和移动代理的关系及其实现方式,移动代理在可穿戴计算机数据处理中的应用及在这方面进行的工作。     

Supporting group collaboration with interpersonal awareness devices

An Interpersonal Awareness Device, or IPAD, is a hand-held or wearable device designed to support awareness and collaboration between people who are in the physical vicinity of each other. An IPAD is designed to supply constant awareness information to users in any location without relying on an underlying infrastructure. We have constructed one such device, the Hummingbird, which gives members of a group continuous aural and visual indications when other group members are close. We have used the Hummingbirds in several different situations to explore how they affect group awareness. These experiences indicated that the Hummingbird increased awareness between group members, and that it could complement other forms of communication, such as phone and email. In particular, we found the Hummingbird to be useful when a group of people were in an unfamiliar location, for instance during a trip, where no other communication support was available. We argue that IPADs such as the Hummingbird may fulfil important functions in modern work situations.     

First Person Indoor/Outdoor Augmented Reality Application: ARQuake

This paper presents a first person outdoor/indoor augmented reality application ARQuake that we have developed. ARQuake is an extension of the desktop game Quake, and as such we are investigating how to convert a desktop first person application into an outdoor/indoor mobile augmented reality application. We present an architecture for a low cost, moderately accurate six degrees of freedom tracking system based on GPS, digital compass, and fiducial vision-based tracking. Usability issues such as monster selection, colour, input devices, and multi-person collaboration are discussed.     

Development and testing of a stitched stretch sensor with the potential to measure human movement

Human movement in health sciences is typically measured using motion capture laboratory equipment, but this method has inherent limitations including cost, specialized knowledge requirements, and inability to measure activity in natural settings. This study presents a novel textile-based stretch sensor with potential for use for measurement of human movement in smart clothing. The sensor is composed of silver-plated thread stitched into a textile substrate. Multiple samples varying in thread type, length, stitch geometry, and textile substrate were systematically fabricated and tested. Elongation and recovery testing revealed the optimal sensor configuration for providing the largest and most repeatable change in resistance. Proper placement of these sensors in clothing may allow for a variety of applications, including kinematic measurement, activity monitoring, movement impairment detection, activity feedback, or control of environmental and assistive technologies.