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Total 1395 results found since Jan 2013.

Sensors, Vol. 19, Pages 2879: Review-Microwave Radar Sensing Systems for Search and Rescue Purposes
ukhopadhyay This paper presents a survey of recent developments using Doppler radar sensor in searching and locating an alive person under debris or behind a wall. Locating a human and detecting the vital signs such as breathing rate and heartbeat using a microwave sensor is a non-invasive technique. Recently, many hardware structures, signal processing approaches, and integrated systems have been introduced by researchers in this field. The purpose is to enhance the accuracy of vital signs’ detection and location detection and reduce energy consumption. This work concentrates on the representative resear...
Source: Sensors - June 27, 2019 Category: Biotechnology Authors: Nguyen Thi Phuoc Van Liqiong Tang Veysel Demir Syed Faraz Hasan Nguyen Duc Minh Subhas Mukhopadhyay Tags: Article Source Type: research

Sensors, Vol. 19, Pages 3294: Vehicle Detection in Aerial Images Using a Fast Oriented Region Search and the Vector of Locally Aggregated Descriptors
Li Li Vehicle detection in aerial images plays a significant role in civil and military applications and it faces many challenges including the overhead-view perspective, the highly complex background, and the variants of vehicles. This paper presents a robust vehicle detection scheme to overcome these issues. In the detection stage, we propose a novel algorithm to generate oriented proposals that could enclose the vehicle objects properly as rotated rectangles with orientations. To discriminate the object and background in the proposals, we propose a modified vector of locally aggregated descriptors (VLAD) imag...
Source: Sensors - July 25, 2019 Category: Biotechnology Authors: Liu Ding Zhu Xiu Li Li Tags: Article Source Type: research

Sensors, Vol. 20, Pages 907: Honeycomb Map: A Bioinspired Topological Map for Indoor Search and Rescue Unmanned Aerial Vehicles
Pereira The use of robots to map disaster-stricken environments can prevent rescuers from being harmed when exploring an unknown space. In addition, mapping a multi-robot environment can help these teams plan their actions with prior knowledge. The present work proposes the use of multiple unmanned aerial vehicles (UAVs) in the construction of a topological map inspired by the way that bees build their hives. A UAV can map a honeycomb only if it is adjacent to a known one. Different metrics to choose the honeycomb to be explored were applied. At the same time, as UAVs scan honeycomb adjacencies, RGB-D and thermal sens...
Source: Sensors - February 7, 2020 Category: Biotechnology Authors: Ricardo da Rosa Marco Aurelio Wehrmeister Thadeu Brito Jos é Luís Lima Ana Isabel Pinheiro Nunes Pereira Tags: Article Source Type: research

Sensors, Vol. 21, Pages 12: Digital Health in Cardiac Rehabilitation and Secondary Prevention: A Search for the Ideal Tool
ndale Digital health is becoming more integrated in daily medical practice. In cardiology, patient care is already moving from the hospital to the patients’ homes, with large trials showing positive results in the field of telemonitoring via cardiac implantable electronic devices (CIEDs), monitoring of pulmonary artery pressure via implantable devices, telemonitoring via home-based non-invasive sensors, and screening for atrial fibrillation via smartphone and smartwatch technology. Cardiac rehabilitation and secondary prevention are modalities that could greatly benefit from digital health integration, as...
Source: Sensors - December 22, 2020 Category: Biotechnology Authors: Maarten Falter Martijn Scherrenberg Paul Dendale Tags: Perspective Source Type: research

Sensors, Vol. 21, Pages 3706: GPS Swept Anti-Jamming Technique Based on Fast Orthogonal Search (FOS)
ureldin Recently, there has been growing demand for GPS-based reliable positioning, with the broadening of a range of new applications that mainly rely on GPS. GPS receivers have, recently, been attractive targets for jamming. GPS signals are received below the noise floor. Thus, they are vulnerable to interference and jamming. A jamming signal can potentially decrease the SNR, which results in disruption of GPS-based services. This paper aims to propose a reliable and accurate, swept anti-jamming technique based on high-resolution spectral analysis, utilizing the FOS method to provide an accurate spectral estimation o...
Source: Sensors - May 26, 2021 Category: Biotechnology Authors: Mohamed Tamazin Michael J. Korenberg Haidy Elghamrawy Aboelmagd Noureldin Tags: Article Source Type: research

Sensors, Vol. 21, Pages 6527: Optimal Material Search for Infrared Markers under Non-Heating and Heating Conditions
This study investigates optimal material combinations for developing an accurate and detachable infrared marker for multiple conditions in the medium wave infrared (MWIR) region. Based on four requirements, 11 material combinations are systematically evaluated. Consequently, the optimal marker differs in relation to the presence of specular reflection components. Metal–insulator markers are suitable under non-heating and hot-air heating conditions without reflection components, although a printed marker made of copier paper is captured more clearly than metal–insulator markers during heating, using an optical radiation...
Source: Sensors - September 29, 2021 Category: Biotechnology Authors: Yuki Kubota Yushan Ke Tomohiko Hayakawa Yushi Moko Masatoshi Ishikawa Tags: Article Source Type: research

Sensors, Vol. 21, Pages 6819: In Search of a Soil Moisture Content Simulation Model: Mechanistic and Data Mining Approach Based on TDR Method Results
rz Majewski Soil moisture content simulation models have continuously been an important research objective. In particular, the comparisons of the performance of different model types deserve proper attention. Therefore, the quality of selected physically-based and statistical models was analyzed utilizing the data from the Time Domain Reflectometry technique. An E-Test measurement system was applied with the reflectogram interpreted into soil volumetric moisture content by proper calibration equations. The gathered data facilitated to calibrate the physical model of Deardorff and establish parameters of: support vector...
Source: Sensors - October 14, 2021 Category: Biotechnology Authors: Andrzej Brandyk Bartosz Szel ąg Adam Kiczko Marcin Krukowski Adam Kozio ł Jerzy Piotrowski Grzegorz Majewski Tags: Article Source Type: research

Sensors, Vol. 22, Pages 158: The Search for Atmospheric Laminar Channels: Experimental Results and Method Dissemination
ricel Agop In this paper, a practical application of theoretical developments found in our previous works is explored in relation to atmospheric lidar data. Multifractal structures, previously named “laminar channels”, have been identified in atmospheric profiles—these exhibit cellular and self-structuring properties, and are spatially ordered across the atmospheric profile. Furthermore, these structures have been connected to the spontaneous emergence of turbulent behavior in the calm atmospheric flow. Calculating the location and occurrence of these channels can help identify...
Source: Sensors - December 27, 2021 Category: Biotechnology Authors: Iulian-Alin Ro șu Drago ș-Constantin Nica C ătălin Dumitraș Drago ș Chitariu Lumini ța Bibire Adrian Stelian Ghenadi Valentin-Stelian Dragan Maricel Agop Tags: Article Source Type: research

Sensors, Vol. 22, Pages 3295: Robot Navigation Based on Potential Field and Gradient Obtained by Bilinear Interpolation and a Grid-Based Search
nan The original concept of the artificial potential field in robot path planning has spawned a variety of extensions to address its main weakness, namely the formation of local minima in which the robot may be trapped. In this paper, a smooth navigation function combining the Dijkstra-based discrete static potential field evaluation with bilinear interpolation is proposed. The necessary modifications of the bilinear interpolation method are developed to make it applicable to the path-planning application. The effect is that the strategy makes it possible to solve the problem of the local minima, to generate smooth pat...
Source: Sensors - April 25, 2022 Category: Biotechnology Authors: Gregor Klan čar Andrej Zde šar Mohan Krishnan Tags: Article Source Type: research

Sensors, Vol. 23, Pages 548: Speeding Task Allocation Search for Reconfigurations in Adaptive Distributed Embedded Systems Using Deep Reinforcement Learning
nza A Critical Adaptive Distributed Embedded System (CADES) is a group of interconnected nodes that must carry out a set of tasks to achieve a common goal, while fulfilling several requirements associated with their critical (e.g., hard real-time requirements) and adaptive nature. In these systems, a key challenge is to solve, in a timely manner, the combinatorial optimization problem involved in finding the best way to allocate the tasks to the available nodes (i.e., the task allocation) taking into account aspects such as the computational costs of the tasks and the computational capacity of the nodes. This problem i...
Source: Sensors - January 3, 2023 Category: Biotechnology Authors: Ram ón Rotaeche Alberto Ballesteros Juli án Proenza Tags: Article Source Type: research

Sensors, Vol. 23, Pages 3337: Optimized Weight Low-Frequency Search Coil Magnetometer for Ground & ndash;Airborne Frequency Domain Electromagnetic Method
Sensors, Vol. 23, Pages 3337: Optimized Weight Low-Frequency Search Coil Magnetometer for Ground–Airborne Frequency Domain Electromagnetic Method Sensors doi: 10.3390/s23063337 Authors: Fei Teng Ye Tong Bofeng Zou The vertical component magnetic field signal in the ground–airborne frequency domain electromagnetic (GAFDEM) method is detected by the air coil sensor, which is parallel to the ground. Unfortunately, the air coil sensor has low sensitivity in the low-frequency band, making it challenging to detect effective low-frequency signals and causing low accuracy and large error for int...
Source: Sensors - March 22, 2023 Category: Biotechnology Authors: Fei Teng Ye Tong Bofeng Zou Tags: Communication Source Type: research

Sensors, Vol. 23, Pages 2545: A Survey of the Performance-Limiting Factors of a 2-Dimensional RSS Fingerprinting-Based Indoor Wireless Localization System
razak A receive signal strength (RSS) fingerprinting-based indoor wireless localization system (I-WLS) uses a localization machine learning (ML) algorithm to estimate the location of an indoor user using RSS measurements as the position-dependent signal parameter (PDSP). There are two stages in the system’s localization process: the offline phase and the online phase. The offline phase starts with the collection and generation of RSS measurement vectors from radio frequency (RF) signals received at fixed reference locations, followed by the construction of an RSS radio map. In the online phase, the instan...
Source: Sensors - February 24, 2023 Category: Biotechnology Authors: Abdulmalik Shehu Yaro Filip Maly Pavel Prazak Tags: Review Source Type: research

Sensors, Vol. 14, Pages 23970-24003: A Multi-Sensor RSS Spatial Sensing-Based Robust Stochastic Optimization Algorithm for Enhanced Wireless Tethering
The objective of this paper is to maximize robot mission capabilities by maximizing the wireless network capacity and to reduce the risk of communication failure. Thus, in this paper, we consider a multi-node wireless tethering structure called the “server-relay-client” framework that uses (multiple) relay nodes in between a server and a client node. We propose a robust stochastic optimization (RSO) algorithm using a multi-sensor-based RSS sampling method at the relay nodes to efficiently improve and balance the RSS between the source and client nodes to improve the network capacity and to provide redundant networking ...
Source: Sensors - December 12, 2014 Category: Biotechnology Authors: Ramviyas ParasuramanThomas FabryLuca MolinariKeith KershawMario CastroAlessandro MasiManuel Ferre Tags: Article Source Type: research

Sensors, Vol. 16, Pages 4: Integration of Directional Antennas in an RSS Fingerprinting-Based Indoor Localization System
In this paper, the integration of directional antennas in a room-level received signal strength (RSS) fingerprinting-based indoor localization system (ILS) is studied. The sensor reader (SR), which is in charge of capturing the RSS to infer the tag position, can be attached to an omnidirectional or directional antenna. Unlike commonly-employed omnidirectional antennas, directional antennas can receive a stronger signal from the direction in which they are pointed, resulting in a different RSS distributions in space and, hence, more distinguishable fingerprints. A simulation tool and a system management software have been a...
Source: Sensors - December 23, 2015 Category: Biotechnology Authors: Raúl Guzmán-QuirósAlejandro Martínez-SalaJosé Gómez-TorneroJoan García-Haro Tags: Article Source Type: research

Sensors, Vol. 16, Pages 1845: RSS Fingerprint Based Indoor Localization Using Sparse Representation with Spatio-Temporal Constraint
The Received Signal Strength (RSS) fingerprint-based indoor localization is an important research topic in wireless network communications. Most current RSS fingerprint-based indoor localization methods do not explore and utilize the spatial or temporal correlation existing in fingerprint data and measurement data, which is helpful for improving localization accuracy. In this paper, we propose an RSS fingerprint-based indoor localization method by integrating the spatio-temporal constraints into the sparse representation model. The proposed model utilizes the inherent spatial correlation of fingerprint data in the fingerpr...
Source: Sensors - November 2, 2016 Category: Biotechnology Authors: Xinglin Piao Yong Zhang Tingshu Li Yongli Hu Hao Liu Ke Zhang Yun Ge Tags: Article Source Type: research