490 research outputs found
Smart vest for respiratory rate monitoring of COPD patients based on non-contact capacitive sensing
In this paper, a first approach to the design of a portable device for non-contact monitoring
of respiratory rate by capacitive sensing is presented. The sensing system is integrated into a smart
vest for an untethered, low-cost and comfortable breathing monitoring of Chronic Obstructive
Pulmonary Disease (COPD) patients during the rest period between respiratory rehabilitation
exercises at home. To provide an extensible solution to the remote monitoring using this sensor and
other devices, the design and preliminary development of an e-Health platform based on the Internet
of Medical Things (IoMT) paradigm is also presented. In order to validate the proposed solution,
two quasi-experimental studies have been developed, comparing the estimations with respect to the
golden standard. In a first study with healthy subjects, the mean value of the respiratory rate error,
the standard deviation of the error and the correlation coefficient were 0.01 breaths per minute (bpm),
0.97 bpm and 0.995 (p < 0.00001), respectively. In a second study with COPD patients, the values
were -0.14 bpm, 0.28 bpm and 0.9988 (p < 0.0000001), respectively. The results for the rest period
show the technical and functional feasibility of the prototype and serve as a preliminary validation of
the device for respiratory rate monitoring of patients with COPD.Ministerio de Ciencia e Innovación PI15/00306Ministerio de Ciencia e Innovación DTS15/00195Junta de Andalucía PI-0010-2013Junta de Andalucía PI-0041-2014Junta de Andalucía PIN-0394-201
Special Issue “Body Sensors Networks for E-Health Applications”
Body Sensor Networks (BSN) have emerged as a particularization of Wireless Sensor
Networks (WSN) in the context of body monitoring environments, closely linked to healthcare
applications. These networks are made up of smart biomedical sensors that allow the monitoring of
physiological parameters and serve as the basis for e-Health applications. This Special Issue collects
some of the latest developments in the field of BSN related to new developments in biomedical sensor
technologies, the design and experimental characterization of on-body/in-body antennas and new
communication protocols for BSN, including some review studies
Collaborative Localization Algorithms for Wireless Sensor Networks with Reduced Localization Error
Localization is an important research issue in Wireless Sensor Networks (WSNs). Though Global Positioning System (GPS) can be used to locate the position of the sensors, unfortunately it is limited to outdoor applications and is costly and power consuming. In order to find location of sensor nodes without help of GPS, collaboration among nodes is highly essential so that localization can be accomplished efficiently. In this paper, novel localization algorithms are proposed to find out possible location information of the normal nodes in a collaborative manner for an outdoor environment with help of few beacons and anchor nodes. In our localization scheme, at most three beacon nodes should be collaborated to find out the accurate location information of any normal node. Besides, analytical methods are designed to calculate and reduce the localization error using probability distribution function. Performance evaluation of our algorithm shows that there is a tradeoff between deployed number of beacon nodes and localization error, and average localization time of the network can be increased with increase in the number of normal nodes deployed over a region
Simultaneous ranging and self-positioning in unsynchronized wireless acoustic sensor networks
Automatic ranging and self-positioning is a very
desirable property in wireless acoustic sensor networks (WASNs)
where nodes have at least one microphone and one loudspeaker.
However, due to environmental noise, interference and multipath
effects, audio-based ranging is a challenging task. This paper
presents a fast ranging and positioning strategy that makes use
of the correlation properties of pseudo-noise (PN) sequences for
estimating simultaneously relative time-of-arrivals (TOAs) from
multiple acoustic nodes. To this end, a proper test signal design
adapted to the acoustic node transducers is proposed. In addition,
a novel self-interference reduction method and a peak matching
algorithm are introduced, allowing for increased accuracy in
indoor environments. Synchronization issues are removed by
following a BeepBeep strategy, providing range estimates that
are converted to absolute node positions by means of multidimensional
scaling (MDS). The proposed approach is evaluated both
with simulated and real experiments under different acoustical
conditions. The results using a real network of smartphones and
laptops confirm the validity of the proposed approach, reaching
an average ranging accuracy below 1 centimeter.This work was supported by the Spanish Ministry of Economy and Competitiveness under Grant TIN2015-70202-P, TEC2012-37945-C02-02 and FEDER funds
A Review of Radio Frequency Based Localization for Aerial and Ground Robots with 5G Future Perspectives
Efficient localization plays a vital role in many modern applications of
Unmanned Ground Vehicles (UGV) and Unmanned aerial vehicles (UAVs), which would
contribute to improved control, safety, power economy, etc. The ubiquitous 5G
NR (New Radio) cellular network will provide new opportunities for enhancing
localization of UAVs and UGVs. In this paper, we review the radio frequency
(RF) based approaches for localization. We review the RF features that can be
utilized for localization and investigate the current methods suitable for
Unmanned vehicles under two general categories: range-based and fingerprinting.
The existing state-of-the-art literature on RF-based localization for both UAVs
and UGVs is examined, and the envisioned 5G NR for localization enhancement,
and the future research direction are explored
Battery-Less Industrial Wireless Monitoring and Control System for Improved Operational Efficiency
An industrial wireless monitoring and control system, capable of supporting energyharvesting
devices through smart sensing and network management, designed for improving electrorefinery
performance by applying predictive maintenance, is presented. The system is self-powered
from bus bars, and features wireless communication and easy-to-access information and alarms. With
cell voltage and electrolyte temperature measurements, the system enables real-time cell performance
discovery and early reaction to critical production or quality disturbances such as short-circuiting,
flow blockages, or electrolyte temperature excursions. Field validation shows an increase in operational
performance of 30% (reaching 97%) in the detection of short circuits, which, thanks to a neural
network deployed, are detected, on average, 10.5 h earlier compared to the traditional methodology.
The developed system is a sustainable IoT solution, being easy to maintain after its deployment, and
providing benefits of improved control and operation, increased current efficiency, and decreased
maintenance costs.The authors would like to thank the Technological Corporation of Andalusia (CTA) and Atlantic Copper S.L.U. company for funding this research under projects 19/1008 and 22/1077
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