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Bronwyn K Clark, Elisabeth A Winkler, Charlotte L Brakenridge, Stewart G Trost, Genevieve N Healy
BACKGROUND: Most wearable devices that measure movement in workplaces cannot determine the context in which people spend time. This study examined the accuracy of Bluetooth sensing (10-second intervals) via the ActiGraph GT9X Link monitor to determine location in an office setting, using two simple, bespoke algorithms. METHODS: For one work day (mean±SD 6.2±1.1 hours), 30 office workers (30% men, aged 38±11 years) simultaneously wore chest-mounted cameras (video recording) and Bluetooth-enabled monitors (initialised as receivers) on the wrist and thigh...
2018: PloS One
Ingrida Ulozienė, Milda Totilienė, Andrius Paulauskas, Tomas Blažauskas, Vaidotas Marozas, Diego Kaski, Virgilijus Ulozas
BACKGROUND AND OBJECTIVE: The subjective visual vertical (SVV) is a measure of a subject's perceived verticality, and a sensitive test of vestibular dysfunction. Despite this, and consequent upon technical and logistical limitations, SVV has not entered mainstream clinical practice. The aim of the study was to develop a mobile virtual reality based system for SVV test, evaluate the suitability of different controllers and assess the system's usability in practical settings. MATERIALS AND METHODS: In this study, we describe a novel virtual reality based system that has been developed to test SVV using integrated software and hardware, and report normative values across healthy population...
February 19, 2018: Medicina
Azkario Rizky Pratama, Widyawan Widyawan, Alexander Lazovik, Marco Aiello
Smart spaces are those that are aware of their state and can act accordingly. Among the central elements of such a state is the presence of humans and their number. For a smart office building, such information can be used for saving energy and safety purposes. While acquiring presence information is crucial, using sensing techniques that are highly intrusive, such as cameras, is often not acceptable for the building occupants. In this paper, we illustrate a proposal for occupancy detection which is low intrusive; it is based on equipment typically available in modern offices such as room-level power-metering and an app running on workers' mobile phones...
March 6, 2018: Sensors
Zhining Gu, Wei Guo, Chaoyang Li, Xinyan Zhu, Tao Guo
Pedestrian dead reckoning (PDR) positioning algorithms can be used to obtain a target's location only for movement with step features and not for driving, for which the trilateral Bluetooth indoor positioning method can be used. In this study, to obtain the precise locations of different states (pedestrian/car) using the corresponding positioning algorithms, we propose an adaptive method for switching between the PDR and car indoor positioning algorithms based on multilayer time sequences (MTSs). MTSs, which consider the behavior context, comprise two main aspects: filtering of noisy data in small-scale time sequences and using a state chain to reduce the time delay of algorithm switching in large-scale time sequences...
February 27, 2018: Sensors
Yan Wang, Xin Li, Jiaheng Zou
With the development of related applications, indoor positioning techniques have been more and more widely developed. Based on Wi-Fi, Bluetooth low energy (BLE) and geomagnetism, indoor positioning techniques often rely on the physical location of fingerprint information. The focus and difficulty of establishing the fingerprint database are in obtaining a relatively accurate physical location with as little given information as possible. This paper presents a foot-mounted inertial measurement unit (IMU) positioning algorithm under the loop closure constraint based on magnetic information...
March 1, 2018: Sensors
Yuan-Chieh Lo, Yuh-Chung Hu, Pei-Zen Chang
Thermal characteristic analysis is essential for machine tool spindles because sudden failures may occur due to unexpected thermal issue. This article presents a lumped-parameter Thermal Network Model (TNM) and its parameter estimation scheme, including hardware and software, in order to characterize both the steady-state and transient thermal behavior of machine tool spindles. For the hardware, the authors develop a Bluetooth Temperature Sensor Module (BTSM) which accompanying with three types of temperature-sensing probes (magnetic, screw, and probe)...
February 23, 2018: Sensors
Hannaneh Hojaiji, Haik Kalantarian, Alex A T Bui, Christine E King, Majid Sarrafzadeh
This paper introduces the design, calibration, and validation of a low-cost portable sensor for the real-time measurement of dust particles within the environment. The proposed design consists of low hardware cost and calibration based on temperature and humidity sensing to achieve accurate processing of airborne dust density. Using commercial particulate matter sensors, a highly accurate air quality monitoring sensor was designed and calibrated using real world variations in humidity and temperature for indoor and outdoor applications...
March 2017: 2017 IEEE Sens Appl Symp (SAS) (2017)
Christoph Rathgeb, Lukas Anschuetz, Daniel Schneider, Cilgia Dür, Marco Caversaccio, Stefan Weber, Tom Williamson
OBJECTIVE: We aimed to design, build and validate a surgical navigation system which fulfills the accuracy requirements for surgical procedures on the ear and the lateral skull base, and which integrates with the endoscopic workflow and operating room setup. MATERIALS AND METHODS: The navigation system consists of portable tablet computer (iPad Pro, Apple Computer, USA) and an optical tracking system (Cambar B1, Axios3D, Germany), both connected via a wireless Bluetooth link and attached directly to the OR table...
February 13, 2018: European Archives of Oto-rhino-laryngology
Vítor Viegas, J M Dias Pereira, Octavian Postolache, Pedro Silva Girão
This paper presents a measurement system intended to monitor the usage of walker assistive devices. The goal is to guide the user in the correct use of the device in order to prevent risky situations and maximize comfort. Two risk indicators are defined: one related to force unbalance and the other related to motor incoordination. Force unbalance is measured by load cells attached to the walker legs, while motor incoordination is estimated by synchronizing force measurements with distance data provided by an optical sensor...
February 10, 2018: Sensors
İlhan İlhan
BACKGROUND AND OBJECTIVE: In this study, a wireless blood pressure holter that can be used with smart mobile devices was developed. The developed blood pressure holter consists of two parts, which are a smart mobile device and a cuff. The smart mobile device is used as a recording, control and display device through a developed interface, while the cuff was designed to take measurements from the arm. METHODS: Resistor-Capacitor (RC) and digital filters were used on the cuff that communicates with the smart mobile device via Bluetooth...
March 2018: Computer Methods and Programs in Biomedicine
Jeffrey T Lai, Brittany P Chapman, Katherine L Boyle, Edward W Boyer, Peter R Chai
Opioid overdose is a growing public health emergency in the United States. The antidote naloxone must be administered rapidly after opioid overdose to prevent death. Bystander or "take-home" naloxone programs distribute naloxone to opioid users and other community members to increase naloxone availability at the time of overdose. However, data describing the natural history of take-home naloxone in the hands of at-risk individuals is lacking. To understand patterns of naloxone uptake in at-risk users, we developed a smart naloxone kit that uses low-energy Bluetooth (BLE) to unobtrusively detect the transit of naloxone through a hospital campus...
January 3, 2018: Proceedings of the ... Annual Hawaii International Conference on System Sciences. Annual Hawaii International Conference on System Sciences
Mathias Tiedemann Svendsen, Flemming Andersen, Kirsten Hammond Andersen, Klaus Ejner Andersen
BACKGROUND: Topical corticosteroid or corticosteroid/calcipotriol preparations are recommended first-line topical treatments of psoriasis, but a main cause for the lack of efficacy of topical treatments is considered low rates of adherence to topical drugs. Patient support by the use of applications (apps) for smartphones is suggested to improve medical adherence. METHODS/DESIGN: Design: An investigator-initiated, single-center, single-blind, parallel-group, phase-4 clinical superiority randomized controlled trial (RCT)...
February 7, 2018: BMC Dermatology
Jonathan C Erickson, James A Hayes, Mauricio Bustamante, Rajwol Joshi, Alfred Rwagaju, Niranchan Paskaranandavadivel, Timothy R Angeli
OBJECTIVE: Multi-channel electrical recordings of physiologically generated signals are common to a wide range of biomedical fields. The aim of this work was to develop, validate, and demonstrate the practical utility of a high-quality, low-cost 32/64-channel bioamplifier system with real-time wireless data streaming capability. APPROACH: The new "Intsy" system integrates 3 main off-the-shelf hardware components: 1) Intan RHD2132 bioamplifier; 2) Teensy 3.2 microcontroller; and 3) RN-42 Bluetooth 2...
February 6, 2018: Physiological Measurement
M S Khan, K Dighe, Z Wang, I Srivastava, E Daza, A S Schwartz-Dual, J Ghannam, S K Misra, D Pan
Prostate-specific antigen (PSA) is a commonly used biomarker for the detection of prostate cancer (PCa) and there are numerous data available for its invasive detection in the serum and whole blood. In this work, an electrochemical sensing method was devised to detect traces of PSA in human saliva using a hybrid nanocomposite of graphene nanoplatelets with diblock co-polymers and Au electrodes (GRP-PS67-b-PAA27-Au). The pure graphitic composition on filter paper provides significantly high electrical and thermal conductivity while PS67-b-PAA27 makes an amphiphilic bridge between GRP units...
February 1, 2018: Analyst
Xavier Biardeau, Sami Hached, Oleg Loutochin, Lysanne Campeau, Mohamad Sawan, Jacques Corcos
INTRODUCTION: We aimed to present three novel remotely controlled hydromechanical artificial urinary sphincters (AUSs) and report their in-vitro and ex-vivo results. METHODS: We successively developed three distinct hydromechanical AUSs on the basis of the existing AMS800™ device by incorporating an electronic pump. No changes were made to the cuff and balloon. The AUS#1 was designed as an electromagnetically controlled device. The AUS#2 and AUS#3 were conceived as Bluetooth 2...
October 2017: Canadian Urological Association Journal, Journal de L'Association des Urologues du Canada
Shihao Li, Abhinav Jain, Timo Tscharntke, Tobias Arnold, Dieter Wilhelm Trau
This paper presents a novel hand-held photometer, termed "Photopette", for on-spot absorbance measurements of biochemical analytes. Photopette is a multicomponent, highly-portable device with an overall weight of 160 g, which fits within 202 mm x 47 mm x 42 mm. Designed in the form-factor of a micropipette, Photopette integrates a photodiode detector with light emitting diodes (LEDs) to form a highly customizable photometer which supports wide variety of applications within the wavelengths between 260 nm and 1050 nm...
January 29, 2018: Analytical Chemistry
Ali Jafari, Nathanael Buswell, Maysam Ghovanloo, Tinoosh Mohsenin
This paper presents a low-power stand-alone tongue drive system (sTDS) used for individuals with severe disabilities to potentially control their environment such as computer, smartphone, and wheelchair using their voluntary tongue movements. A low-power local processor is proposed, which can perform signal processing to convert raw magnetic sensor signals to user-defined commands, on the sTDS wearable headset, rather than sending all raw data out to a PC or smartphone. The proposed sTDS significantly reduces the transmitter power consumption and subsequently increases the battery life...
February 2018: IEEE Transactions on Biomedical Circuits and Systems
Kwang-Il Kim, Nima Nikzad, Giorgio Quer, Nathan E Wineinger, Matthieu Vegreville, Alexis Normand, Nicolas Schmidt, Eric J Topol, Steven Steinhubl
BACKGROUND: Using the data from 56,365 individuals, from 185 countries, and a Nokia Health Wireless blood pressure (BP) monitor, we investigated real-world characteristics of BP variability (BPV). METHODS: All included individuals self-measured and uploaded their BP using Bluetooth at least 20 times over a period of ≥1 month at a frequency and duration of their choosing. In total, 16,904,844 BP measurements were analyzed, with a median of 146 measurements per person (interquartile range [IQR] 73-321) over a median of 14 months (IQR 7-31)...
December 23, 2018: American Journal of Hypertension
Zhongliang Deng, Xiao Fu, Hanhua Wang
Research on indoor positioning technologies has recently become a hotspot because of the huge social and economic potential of indoor location-based services (ILBS). Wireless positioning signals have a considerable attenuation in received signal strength (RSS) when transmitting through human bodies, which would cause significant ranging and positioning errors in RSS-based systems. This paper mainly focuses on the body-shadowing impairment of RSS-based ranging and positioning, and derives a mathematical expression of the relation between the body-shadowing effect and the positioning error...
January 20, 2018: Sensors
Md Mehedi Hasan, Mohammad Rashed Iqbal Faruque, Mohammad Tariqul Islam
A compact metamaterial inspired antenna operate at LTE, Bluetooth and WiMAX frequency band is introduced in this paper. For the lower band, the design utilizes an outer square metallic strip forcing the patch to radiate as an equivalent magnetic-current loop. For the upper band, another magnetic current loop is created by adding metamaterial structure near the feed line on the patch. The metamaterial inspired antenna dimension of 42 × 32 mm2 compatible to wireless devices. Finite integration technique based CST Microwave Studio simulator has been used to design and numerical investigation as well as lumped circuit model of the metamaterial antenna is explained with proper mathematical derivation...
January 19, 2018: Scientific Reports
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