Simple Wireless Impedance Pneumography System for Unobtrusive Sensing of Respiration

This extended paper presents the development and implementation at a prototype level of a wireless, low-cost system for the measurement of the electrical bioimpedance of the chest with two channels using the AD5933 in a bipolar electrode configuration to measure impedance pneumography. The measurement device works for impedance measurements ranging from 1 Ω to 1800 Ω. Fifteen volunteers were measured with the prototype. We found that the left hemithorax has higher impedance compared to the right hemithorax, and the acquired signal presents the phases of the respiratory cycle with variations between 1 Ω, in normal breathing, to 6 Ω in maximum inhalation events. The system can measure the respiratory cycle variations simultaneously in both hemithorax with a mean error of −0.18 ± 1.42 BPM (breaths per minute) in the right hemithorax and −0.52 ± 1.31 BPM for the left hemithorax, constituting a useful device for the breathing rate calculation and possible screening applications.

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Patients in intensive care unit for COVID-19 pneumonia: the lung ultrasound patterns at admission and discharge. An observational pilot study

The Ultrasound Journal ◽

10.1186/s13089-021-00213-x ◽

2021 ◽

Vol 13 (1) ◽

Author(s):

Persona Paolo ◽

Valeri Ilaria ◽

Zarantonello Francesco ◽

Forin Edoardo ◽

Sella Nicolò ◽

...

Keyword(s):

Intensive Care ◽

Lung Ultrasound ◽

Low Cost ◽

Low Frequency ◽

Specific Pattern ◽

University Hospital ◽

Left Hemithorax ◽

Significant Difference ◽

The Right ◽

B Lines

Abstract Background During COVID-19 pandemic, optimization of the diagnostic resources is essential. Lung Ultrasound (LUS) is a rapid, easy-to-perform, low cost tool which allows bedside investigation of patients with COVID-19 pneumonia. We aimed to investigate the typical ultrasound patterns of COVID-19 pneumonia and their evolution at different stages of the disease. Methods We performed LUS in twenty-eight consecutive COVID-19 patients at both admission to and discharge from one of the Padua University Hospital Intensive Care Units (ICU). LUS was performed using a low frequency probe on six different areas per each hemithorax. A specific pattern for each area was assigned, depending on the prevalence of A-lines (A), non-coalescent B-lines (B1), coalescent B-lines (B2), consolidations (C). A LUS score (LUSS) was calculated after assigning to each area a defined pattern. Results Out of 28 patients, 18 survived, were stabilized and then referred to other units. The prevalence of C pattern was 58.9% on admission and 61.3% at discharge. Type B2 (19.3%) and B1 (6.5%) patterns were found in 25.8% of the videos recorded on admission and 27.1% (17.3% B2; 9.8% B1) on discharge. The A pattern was prevalent in the anterosuperior regions and was present in 15.2% of videos on admission and 11.6% at discharge. The median LUSS on admission was 27.5 [21–32.25], while on discharge was 31 [17.5–32.75] and 30.5 [27–32.75] in respectively survived and non-survived patients. On admission the median LUSS was equally distributed on the right hemithorax (13; 10.75–16) and the left hemithorax (15; 10.75–17). Conclusions LUS collected in COVID-19 patients with acute respiratory failure at ICU admission and discharge appears to be characterized by predominantly lateral and posterior non-translobar C pattern and B2 pattern. The calculated LUSS remained elevated at discharge without significant difference from admission in both groups of survived and non-survived patients.

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Low-Cost System Handles Patient Phone Calls

Internal Medicine News ◽

10.1016/s1097-8690(07)70680-7 ◽

2007 ◽

Vol 40 (11) ◽

pp. 53

Author(s):

BRUCE K. DIXON

Keyword(s):

Low Cost ◽

Cost System ◽

Phone Calls

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Intelligent, low-cost system for fume control during laser material processing

International Laser Safety Conference ◽

10.2351/1.5056599 ◽

2005 ◽

Author(s):

Ramin Sattari ◽

Stephan Barcikowski ◽

Thomas Püster ◽

Andreas Ostendorf ◽

Heinz Haferkamp

Keyword(s):

Material Processing ◽

Low Cost ◽

Laser Material Processing ◽

Laser Material ◽

Cost System

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A Low-cost System for High-frequency Solar Imagery and Power Data Acquisition

Journal of Physics Conference Series ◽

10.1088/1742-6596/1826/1/012082 ◽

2021 ◽

Vol 1826 (1) ◽

pp. 012082

Author(s):

G F Bassous ◽

R F Calili ◽

C R H Barbosa

Keyword(s):

Data Acquisition ◽

High Frequency ◽

Low Cost ◽

Cost System

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Development of a Low Cost System for Lifting Related Injury Analysis

2021 13th International Conference on Computer and Automation Engineering (ICCAE) ◽

10.1109/iccae51876.2021.9426132 ◽

2021 ◽

Author(s):

Mahmudul Hasan ◽

Miftahur Rahman

Keyword(s):

Low Cost ◽

Cost System ◽

Injury Analysis

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Low-cost system in the analysis of the recovery of mobility through inertial navigation techniques and virtual reality

Healthcare Paradigms in the Internet of Things Ecosystem ◽

10.1016/b978-0-12-819664-9.00012-0 ◽

2021 ◽

pp. 271-292

Author(s):

Wilver Auccahuasi ◽

Mónica Diaz ◽

Fernando Sernaque ◽

Edward Flores ◽

Justiniano Aybar ◽

...

Keyword(s):

Virtual Reality ◽

Low Cost ◽

Inertial Navigation ◽

Cost System

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Low-cost system for radiometric calibration of UAV-based multispectral imagery

Journal of Spatial Science ◽

10.1080/14498596.2020.1860146 ◽

2020 ◽

pp. 1-15

Author(s):

Jorge Tadeu Fim Rosas ◽

Francisco de Assis de Carvalho Pinto ◽

Daniel Marçal de Queiroz ◽

Flora Maria de Melo Villar ◽

Rodrigo Nogueira Martins ◽

...

Keyword(s):

Low Cost ◽

Multispectral Imagery ◽

Radiometric Calibration ◽

Cost System

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Voice In Ear

Proceedings of the ACM on Interactive Mobile Wearable and Ubiquitous Technologies ◽

10.1145/3448113 ◽

2021 ◽

Vol 5 (1) ◽

pp. 1-25

Author(s):

Yang Gao ◽

Yincheng Jin ◽

Jagmohan Chauhan ◽

Seokmin Choi ◽

Jiyang Li ◽

...

Keyword(s):

User Authentication ◽

Low Cost ◽

The Body ◽

Ear Canal ◽

Replay Attacks ◽

Increasing Demand ◽

The Right ◽

Sound Conduction ◽

Enrollment Data ◽

Secure Authentication

With the rapid growth of wearable computing and increasing demand for mobile authentication scenarios, voiceprint-based authentication has become one of the prevalent technologies and has already presented tremendous potentials to the public. However, it is vulnerable to voice spoofing attacks (e.g., replay attacks and synthetic voice attacks). To address this threat, we propose a new biometric authentication approach, named EarPrint, which aims to extend voiceprint and build a hidden and secure user authentication scheme on earphones. EarPrint builds on the speaking-induced body sound transmission from the throat to the ear canal, i.e., different users will have different body sound conduction patterns on both sides of ears. As the first exploratory study, extensive experiments on 23 subjects show the EarPrint is robust against ambient noises and body motions. EarPrint achieves an Equal Error Rate (EER) of 3.64% with 75 seconds enrollment data. We also evaluate the resilience of EarPrint against replay attacks. A major contribution of EarPrint is that it leverages two-level uniqueness, including the body sound conduction from the throat to the ear canal and the body asymmetry between the left and the right ears, taking advantage of earphones' paring form-factor. Compared with other mobile and wearable biometric modalities, EarPrint is a low-cost, accurate, and secure authentication solution for earphone users.

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