scholarly journals Arm-ECG Wireless Sensor System for Wearable Long-Term Surveillance of Heart Arrhythmias

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1300 ◽  
Author(s):  
Angel Villegas ◽  
David McEneaney ◽  
Omar Escalona
Keyword(s):  
Performance Assessment ◽  
Heart Rhythm ◽  
Sensor System ◽  
Ecg Signal ◽  
Far Field ◽  
Predictive Values ◽  
Dry Electrode ◽  
Prototype Device ◽  
Assessment Results

This article presents the devising, development, prototyping and assessment of a wearable arm-ECG sensor system (WAMECG1) for long-term non-invasive heart rhythm monitoring, and functionalities for acquiring, storing, visualizing and transmitting high-quality far-field electrocardiographic signals. The system integrates the main building blocks present in a typical ECG monitoring device such as the skin surface electrodes, front-end amplifiers, analog and digital signal conditioning filters, flash memory and wireless communication capability. These are integrated into a comfortable, easy to wear, and ergonomically designed arm-band ECG sensor system which can acquire a bipolar ECG signal from the upper arm of the user over a period of 72 h. The small-amplitude bipolar arm-ECG signal is sensed by a reusable, long-lasting, Ag–AgCl based dry electrode pair, then digitized using a programmable sampling rate in the range of 125 to 500 Hz and transmitted via Wi-Fi. The prototype comparative performance assessment results showed a cross-correlation value of 99.7% and an error of less than 0.75% when compared to a reference high-resolution medical-grade ECG system. Also, the quality of the recorded far-field bipolar arm-ECG signal was validated in a pilot trial with volunteer subjects from within the research team, by wearing the prototype device while: (a) resting in a chair; and (b) doing minor physical activities. The R-peak detection average sensibilities were 99.66% and 94.64%, while the positive predictive values achieved 99.1% and 92.68%, respectively. Without using any additional algorithm for signal enhancement, the average signal-to-noise ratio (SNR) values were 21.71 and 18.25 for physical activity conditions (a) and (b) respectively. Therefore, the performance assessment results suggest that the wearable arm-band prototype device is a suitable, self-contained, unobtrusive platform for comfortable cardiac electrical activity and heart rhythm logging and monitoring.

scholarly journals Ionic Liquid Regenerated Cellulose Membrane Electroless Plated By Silver Layer For ECG Signal Monitoring

2021 ◽  
Author(s):  
Xueli Fu ◽  
Yanping Wang ◽  
Wei Wang ◽  
Dan Yu
Keyword(s):  
Ionic Liquid ◽  
Skin Irritation ◽  
Regenerated Cellulose ◽  
Cellulose Membrane ◽  
Ecg Signal ◽  
Contact Impedance ◽  
Skin Contact ◽  
Dry Electrode ◽  
Wide Range

Abstract Flexible electrodes have attracted the interest of a wide range of people because they can monitor human health signals like ECG, EMG and EEG as wearable devices. However, PDMS-based membrane electrodes have the problem of difficulty in depositing metal layers, while fabric electrodes have high contact impedance. Furthermore, the widely used Ag/AgCl electrodes have the shortcomings of skin inflammation or skin irritation. Therefore, we fabricate a skin-like electrical conductive electrode via electroless silver plating on the surface of regenerated cellulose membrane, in which the cellulose membrane is obtained by the dissolution of cotton fiber with green solvent ionic liquid [Bmim]Cl. The as-prepared biocompatible electrode with low skin-electrode contact impedance can be used as a dry electrode for a long-term period of use. The impedance at 700 Hz is only 8 kΩ/cm2, and the conductivity can reach 252 s/cm. After 5 hours of wear, the skin contact impedance of the electrode was only 10 kΩ/cm2 under 700 Hz(when AgNO3 was used at a concentration of 0.20 mol/L). Importantly, the electrodes not only provide a stable and clear ECG signal, but also offer a high level of comfort and low impedance, when used for long-term health monitoring.

scholarly journals Development of Building Information Modeling Template for Environmental Impact Assessment

2021 ◽  
Vol 13 (6) ◽  
pp. 3092
Author(s):  
Sungwoo Lee ◽  
Sungho Tae ◽  
Hyungjae Jang ◽  
Chang U. Chae ◽  
Youngjin Bok
Keyword(s):  
Environmental Impact ◽  
Performance Assessment ◽  
Environmental Performance ◽  
Building Materials ◽  
Building Information Modeling ◽  
Information Modeling ◽  
Assessment Tools ◽  
Building Information ◽  
Environmental Performance Assessment ◽  
Assessment Results

Eco-friendly building designs that use building information modeling (BIM) have become popular, and a variety of eco-friendly building assessment technologies that take advantage of BIM are being developed. However, existing building environmental performance assessment technologies that use BIM are linked to external assessment tools, and there exist compatibility issues among programs; it requires a considerable amount of time to address these problems, owing to the lack of experts who can operate the programs. This study aims to develop eco-friendly templates for assessing the embodied environmental impact of buildings using BIM authoring tools as part of the development of BIM-based building life cycle assessment (LCA) technologies. Therefore, an embodied environmental impact unit database was developed, for major building materials during production and operating stages, to perform embodied environmental impact assessments. Moreover, a major structural element library that uses the database was developed and a function was created to produce building environmental performance assessment results tables, making it possible to review the eco-friendliness of buildings. A case study analysis was performed to review the feasibility of the environmental performance assessment technologies. The results showed a less than 5% effective error rate in the assessment results that were obtained using the technology developed in this study compared with the assessment results based on the actual calculation and operating stage energy consumption figures, which proves the reliability of the proposed approach.

scholarly journals Long-Term Performance Assessment of an Operative Post-Tensioned Timber Frame Structure

2019 ◽  
Vol 145 (5) ◽  
pp. 04019034 ◽  
Author(s):  
G. Granello ◽  
C. Leyder ◽  
A. Frangi ◽  
A. Palermo ◽  
E. Chatzi
Keyword(s):  
Performance Assessment ◽  
Frame Structure ◽  
Timber Frame ◽  
Long Term Performance ◽  
Term Performance ◽  
Post Tensioned

A long-term stable paper-based glucose sensor using a glucose oxidase-loaded, Mn2BPMP-conjugated nanocarrier with a smartphone readout

Nanoscale ◽  
2021 ◽  
Author(s):  
Soyeon Yoo ◽  
Kiyoon Min ◽  
Giyoong Tae ◽  
Min Su Han
Keyword(s):  
Glucose Oxidase ◽  
Glucose Sensor ◽  
Sensor System ◽  
Term Stability ◽  
Long Term Stability

A paper-type sensor system was devised using an enzyme-loaded, artificial peroxidase-conjugated nanocarrier to maintain long-term stability with smartphone readout.

WBAN Based Long Term ECG Monitoring

2013 ◽  
Vol 1 (3) ◽  
pp. 20-37 ◽  
Author(s):  
Marius Rosu ◽  
Sever Pasca
Keyword(s):  
Low Power ◽  
Sensor Nodes ◽  
Ecg Signal ◽  
Area Network ◽  
Wireless Sensor Nodes ◽  
Medication Process ◽  
Remote Healthcare ◽  
Electrocardiogram Ecg ◽  
Supply Information

Healthcare solutions using anytime, and anywhere remote healthcare surveillance devices, have become a major challenge. The patients with chronic diseases who need only therapeutic supervision are not advised to occupy a hospital bed. Using Wearable Wireless Body/Personal Area Network (WWBAN), intelligent monitoring of heart can supply information about medical conditions. Electrocardiogram (ECG) is the core reference in the diagnosis and medication process. An approach on healthcare solution WBAN based, for real-time ECG signal monitoring and long-term recording will be presented. Low-power wireless sensor nodes with local processing and encoding capabilities in order to achieve maximum mobility and flexibility are our main goal. ZigBee wireless technology will be used for transmission. Sensor device will be programmed to process locally the ECG signal and to raise an alert. Low-power and miniaturization are essential physical requirements.

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