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https://www.readbyqxmd.com/read/28800221/graphene-paper-pressure-sensor-for-detecting-human-motions
#1
Lu-Qi Tao, Kun-Ning Zhang, He Tian, Ying Liu, Dan-Yang Wang, Yuan-Quan Chen, Yi Yang, Tian-Ling Ren
The pressure sensors should have an excellent sensitivity in the range of 0-20kPa when applied in wearable applications. Traditional pressure sensors can't achieve both a high sensitivity and a large working range simultaneously, which results to their limited applications in wearable fields. There is an urgent need to develop a pressure sensor to make a breakthrough in both sensitivity and working range. In this paper, a graphene-paper pressure sensor which shows excellent performance in the range of 0-20kPa is proposed...
August 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28798200/wearable-physiological-monitoring-for-human-thermal-work-strain-optimization
#2
Mark J Buller, Alexander Pearson Welles, Karl E Friedl
Safe performance limits of soldiers and athletes have typically relied on predictive work-rest models of ambient conditions, average work intensity, and characteristics of the population. Bioengineering advances in noninvasive sensor technologies including miniaturization, reduced cost, power requirements, and comfort now make it possible to produce individual predictions of safe thermal-work limits. These precision medicine assessments depend on the development of thoughtful algorithms based on physics and physiology...
August 10, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28798198/wearable-ballistocardiogram-and-seismocardiogram-systems-for-health-and-performance
#3
Mozziyar Etemadi, Omer T Inan
Cardiovascular diseases (CVDs) are prevalent in the US and many forms of CVDs primarily affect the mechanical aspects of heart function. Wearable technologies for monitoring the mechanical health of the heart and vasculature could enable proactive management of CVDs through titration of care based on physiological status, as well as preventative wellness monitoring to help promote lifestyle choices that reduce the overall risk of developing CVDs. Additionally, such wearable technologies could be used to optimize human performance in austere environments...
August 10, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28798008/activity-recognition-in-individuals-walking-with-assistive-devices-the-benefits-of-device-specific-models
#4
Luca Lonini, Aakash Gupta, Susan Deems-Dluhy, Shenan Hoppe-Ludwig, Konrad Kording, Arun Jayaraman
BACKGROUND: Wearable sensors gather data that machine-learning models can convert into an identification of physical activities, a clinically relevant outcome measure. However, when individuals with disabilities upgrade to a new walking assistive device, their gait patterns can change, which could affect the accuracy of activity recognition. OBJECTIVE: The objective of this study was to assess whether we need to train an activity recognition model with labeled data from activities performed with the new assistive device, rather than data from the original device or from healthy individuals...
August 10, 2017: JMIR Rehabil Assist Technol
https://www.readbyqxmd.com/read/28796626/matrix-and-tensor-completion-on-a-human-activity-recognition-framework
#5
Sofia Savvaki, Grigorios Tsagkatakis, Athanasia Panousopoulou, Panagiotis Tsakalides
Sensor-based activity recognition is encountered in innumerable applications of the arena of pervasive healthcare and plays a crucial role in biomedical research. Nonetheless, the frequent situation of unobserved measurements impairs the ability of machine learning algorithms to efficiently extract context from raw streams of data. In this work, we study the problem of accurate estimation of missing multi-modal inertial data and we propose a classification framework that considers the reconstruction of sub-sampled data during the test phase...
August 7, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28795753/single-wearable-sensing-energy-device-based-on-photoelectric-biofuel-cells-for-simultaneous-analysis-of-perspiration-and-illuminance
#6
You Yu, Junfeng Zhai, Yong Xia, Shaojun Dong
Wearable electronics are essential for the construction of epidermal energy supply and portable healthcare devices. Herein, a self-powered wearable electronic device based on a photoelectric biofuel cell has been introduced for the first time to simultaneously detect the perspiration lactate and monitor the ambient illuminance depending on independent parameters. The functions of harvesting energy, detection of body function and monitoring of ambient have been merged into a single wireless sensor. This novel design may provide a wide range of smart and exciting wearable electronics...
August 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/28792481/activity-recognition-invariant-to-sensor-orientation-with-wearable-motion-sensors
#7
Aras Yurtman, Billur Barshan
Most activity recognition studies that employ wearable sensors assume that the sensors are attached at pre-determined positions and orientations that do not change over time. Since this is not the case in practice, it is of interest to develop wearable systems that operate invariantly to sensor position and orientation. We focus on invariance to sensor orientation and develop two alternative transformations to remove the effect of absolute sensor orientation from the raw sensor data. We test the proposed methodology in activity recognition with four state-of-the-art classifiers using five publicly available datasets containing various types of human activities acquired by different sensor configurations...
August 9, 2017: Sensors
https://www.readbyqxmd.com/read/28791596/automated-respiratory-sinus-arrhythmia-measurement-demonstration-using-executive-function-assessment
#8
Meghan Hegarty-Craver, Kristin H Gilchrist, Cathi B Propper, Gregory F Lewis, Samuel J DeFilipp, Jennifer L Coffman, Michael T Willoughby
Respiratory sinus arrhythmia (RSA) is a quantitative metric that reflects autonomic nervous system regulation and provides a physiological marker of attentional engagement that supports cognitive and affective regulatory processes. RSA can be added to executive function (EF) assessments with minimal participant burden because of the commercial availability of lightweight, wearable electrocardiogram (ECG) sensors. However, the inclusion of RSA data in large data collection efforts has been hindered by the time-intensive processing of RSA...
August 8, 2017: Behavior Research Methods
https://www.readbyqxmd.com/read/28790972/investigation-of-anticipatory-postural-adjustments-during-one-leg-stance-using-inertial-sensors-evidence-from-subjects-with-parkinsonism
#9
Gianluca Bonora, Martina Mancini, Ilaria Carpinella, Lorenzo Chiari, Maurizio Ferrarin, John G Nutt, Fay B Horak
The One-Leg Stance (OLS) test is a widely adopted tool for the clinical assessment of balance in the elderly and in subjects with neurological disorders. It was previously showed that the ability to control anticipatory postural adjustments (APAs) prior to lifting one leg is significantly impaired by idiopathic Parkinson's disease (iPD). However, it is not known how APAs are affected by other types of parkinsonism, such as frontal gait disorders (FGD). In this study, an instrumented OLS test based on wearable inertial sensors is proposed to investigate both the initial anticipatory phase and the subsequent unipedal balance...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28783651/automatic-recognition-of-activities-of-daily-living-utilizing-insole-based-and-wrist-worn-wearable-sensors
#10
Nagaraj Hegde, Matthew Bries, Tracy Swibas, Edward Melanson, Edward Sazonov
Automatic recognition of activities of daily living (ADL) is an important component in understanding of energy balance, quality of life and other areas of health and well-being. In our previous work, we had proposed an insole based activity monitor - SmartStep, designed to be socially acceptable and comfortable. The goals of the current study were: first, validation of SmartStep in recognition of a broad set of ADL; second, comparison of the SmartStep to a wrist sensor and testing these in combination; third, evaluation of SmartStep accuracy in measuring wear non-compliance and a novel activity class (driving); fourth, performing the validation in free living against a well-studied criterion measure (ActivPAL, PAL Technologies); and fifth, quantitative evaluation of the perceived comfort of SmartStep...
August 1, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28783079/an-ultra-low-power-turning-angle-based-biomedical-signal-compression-engine-with-adaptive-threshold-tuning
#11
Jun Zhou, Chao Wang
Intelligent sensing is drastically changing our everyday life including healthcare by biomedical signal monitoring, collection, and analytics. However, long-term healthcare monitoring generates tremendous data volume and demands significant wireless transmission power, which imposes a big challenge for wearable healthcare sensors usually powered by batteries. Efficient compression engine design to reduce wireless transmission data rate with ultra-low power consumption is essential for wearable miniaturized healthcare sensor systems...
August 6, 2017: Sensors
https://www.readbyqxmd.com/read/28773047/a-novel-method-for-fabricating-wearable-piezoresistive-and-pressure-sensors-based-on-modified-graphite-polyurethane-composite-films
#12
Yin He, Wei Li, Guilin Yang, Hao Liu, Junyu Lu, Tongtong Zheng, Xiaojiu Li
A wearable, low-cost, highly repeatable piezoresistive sensor was fabricated by the synthesis of modified-graphite and polyurethane (PU) composites and polydimethylsiloxane (PDMS). Graphite sheets functionalized by using a silane coupling agent (KH550) were distributed in PU/N,N-dimethylformamide (DMF) solution, which were then molded to modified-graphite/PU (MG/PU) composite films. Experimental results show that with increasing modified-graphite content, the tensile strength of the MG/PU films first increased and then decreased, and the elongation at break of the composite films showed a decreasing trend...
June 22, 2017: Materials
https://www.readbyqxmd.com/read/28770206/meal-microstructure-characterization-from-sensor-based-food-intake-detection
#13
Abul Doulah, Muhammad Farooq, Xin Yang, Jason Parton, Megan A McCrory, Janine A Higgins, Edward Sazonov
To avoid the pitfalls of self-reported dietary intake, wearable sensors can be used. Many food ingestion sensors offer the ability to automatically detect food intake using time resolutions that range from 23 ms to 8 min. There is no defined standard time resolution to accurately measure ingestive behavior or a meal microstructure. This paper aims to estimate the time resolution needed to accurately represent the microstructure of meals such as duration of eating episode, the duration of actual ingestion, and number of eating events...
2017: Frontiers in Nutrition
https://www.readbyqxmd.com/read/28762503/mechanomyography-based-wearable-monitor-of-quasi-isometric-muscle-fatigue-for-motor-neural-prostheses
#14
Eddy Krueger, Lana Popović-Maneski, Percy Nohama
A motor neural prosthesis based on surface functional electrical stimulation (sFES) can restore functional movement (e.g., standing, walking) in patients with a spinal cord injury (SCI). sFES generates muscle contractions in antigravity muscles and allows balance-assisted standing. This induced standing has several benefits, such as improved cardiovascular function, decreased incidence of urinary infections, reduced joint contractures, and muscle atrophy. The duration of sFES assisted standing is limited due to the quick onset of muscle fatigue...
August 1, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28761162/hearables-multimodal-physiological-in-ear-sensing
#15
Valentin Goverdovsky, Wilhelm von Rosenberg, Takashi Nakamura, David Looney, David J Sharp, Christos Papavassiliou, Mary J Morrell, Danilo P Mandic
Future health systems require the means to assess and track the neural and physiological function of a user over long periods of time, and in the community. Human body responses are manifested through multiple, interacting modalities - the mechanical, electrical and chemical; yet, current physiological monitors (e.g. actigraphy, heart rate) largely lack in cross-modal ability, are inconvenient and/or stigmatizing. We address these challenges through an inconspicuous earpiece, which benefits from the relatively stable position of the ear canal with respect to vital organs...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28758986/development-of-wearable-sheet-type-shear-force-sensor-and-measurement-system-that-is-insusceptible-to-temperature-and-pressure
#16
Shigeru Toyama, Yasuhiro Tanaka, Satoshi Shirogane, Takashi Nakamura, Tokio Umino, Ryo Uehara, Takuma Okamoto, Hiroshi Igarashi
A sheet-type shear force sensor and a measurement system for the sensor were developed. The sensor has an original structure where a liquid electrolyte is filled in a space composed of two electrode-patterned polymer films and an elastic rubber ring. When a shear force is applied on the surface of the sensor, the two electrode-patterned films mutually move so that the distance between the internal electrodes of the sensor changes, resulting in current increase or decrease between the electrodes. Therefore, the shear force can be calculated by monitoring the current between the electrodes...
July 31, 2017: Sensors
https://www.readbyqxmd.com/read/28758899/flexible-transparent-and-high-performance-gas-sensor-based-on-layer-materials-for-wearable-technology
#17
Zhaoqiang Zheng, J D Yao, Bing Wang, G W Guo Wei Yang
Gas sensors play a vital role among a wide range of practical applications. Recently, propelled by the development of layered materials, gas sensors have gained much progress. However, the high operation temperature has restricted their further application. Herein, via a facile pulsed laser deposition (PLD) method, we demonstrate a flexible, transparent and high-performance gas sensor made of highly-crystalline indium selenide (In2Se3) film. Under UV-Vis-NIR light or even solar energy activation, the constructed gas sensors exhibit superior properties for detecting acetylene (C2H2) gas at room temperature...
July 31, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28758264/supercapacitive-iontronic-nanofabric-sensing
#18
Ruya Li, Yang Si, Zijie Zhu, Yaojun Guo, Yingjie Zhang, Ning Pan, Gang Sun, Tingrui Pan
The study of wearable devices has become a popular research topic recently, where high-sensitivity, noise proof sensing mechanisms with long-term wearability play critical roles in a real-world implementation, while the existing mechanical sensing technologies (i.e., resistive, capacitive, or piezoelectric) have yet offered a satisfactory solution to address them all. Here, we successfully introduced a flexible supercapacitive sensing modality to all-fabric materials for wearable pressure and force sensing using an elastic ionic-electronic interface...
July 31, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28754916/self-powered-pressure-sensor-with-fully-encapsulated-3d-printed-wavy-substrate-and-highly-aligned-piezoelectric-fibers-array
#19
Yiin Kuen Fuh, Bo Sheng Wang, Chen-Yu Tsai
Near-field electrospinning (NFES) is capable of precisely deposit one-dimensional (1D) or two-dimensional (2D) highly aligned micro/nano fibers (NMFs) by electrically discharged a polymer solution. In this paper, a new integration of three-dimensional (3D) architectures of NFES electrospun polyvinylidene fluoride (PVDF) NMFs with the 3D printed topologically tailored substrate are demonstrated in a direct-write and in-situ poled manner, called wavy- substrate self-powered sensors (WSS). The fabrication steps are composed of the additive manufacture of 3D printed flexible and sinusoidal wavy substrate, metallization and NFES electrospun fibers in the 3D topology...
July 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28753269/highly-sensitive-flexible-pressure-sensor-based-on-silver-nanowires-embedded-polydimethylsiloxane-electrode-with-microarray-structure
#20
Xingtian Shuai, Pengli Zhu, Wenjin Zeng, Yougen Hu, Xianwen Liang, Yu Zhang, Rong Sun, Ching-Ping Wong
Flexible pressure sensors have attracted increasing research interest because of their potential applications for wearable sensing devices. Herein, a highly sensitive flexible pressure sensor is exhibited based on the elastomeric electrodes and a microarray architecture. Polydimethylsiloxane (PDMS) substrate, coated with silver nanowires (AgNWs), is used as the top electrode, while polyvinylidene fluoride (PVDF) as the dielectric layer. Several transfer processes are applied on seeking facile strategy for the preparation of the bottom electrode via embedding AgNWs into the PDMS film of microarray structure...
August 9, 2017: ACS Applied Materials & Interfaces
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