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Source: Sensors
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Total 1478 results found since Jan 2013.
Sensors, Vol. 16, Pages 1253: Thermal Image Sensing Model for Robotic Planning and Search
This work presents a search planning system for a rolling robot to find a source of infra-red (IR) radiation at an unknown location. Heat emissions are observed by a low-cost home-made IR passive visual sensor. The sensor capability for detection of radiation spectra was experimentally characterized. The sensor data were modeled by an exponential model to estimate the distance as a function of the IR image ’s intensity, and, a polynomial model to estimate temperature as a function of IR intensities. Both theoretical models are combined to deduce a subtle nonlinear exact solution via distance-temperature. A planning syste...
Source: Sensors - August 7, 2016 Category: Biotechnology Authors: L ídice Castro Jiménez Edgar Mart ínez-García Tags: Article Source Type: research
Sensors, Vol. 17, Pages 145: Detection of the Vascular Endothelial Growth Factor with a Novel Bioluminescence Resonance Energy Transfer Pair Using a Two-Component System
In this paper we describe a two-component BRET (bioluminescence resonance energy transfer)-based method to detect vascular endothelial growth factor (VEGF) molecules in unknown samples as the basis for subsequent in vivo use. A luminescent VEGF binding molecule, which binds in the receptor binding motif of VEGF, is used as the energy donor, transferred to a fluorophore-coupled VEGF binding molecule (acceptor), which binds to the neuropilin binding motif of VEGF, thus enabling energy transfer from the donor to the acceptor molecule. This leads to the emission of light at a longer wavelength and thus the generation of an inc...
Source: Sensors - January 12, 2017 Category: Biotechnology Authors: Tobias Wimmer Eva Schroeter Birgit Lorenz Knut Stieger Tags: Article Source Type: research
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. 20, Pages 4503: In Vivo Tumor Vascular Imaging with Light Emitting Diode-Based Photoacoustic Imaging System
In this study, we evaluated the capability of a Light-Emitting Diode (LED)-based PA and ultrasound (US) imaging system for monitoring heterogenous microvasculature in tumors (up to 10 mm in depth) and quantitatively compared the PA images with gold standard histology images. We used a combination of a 7 MHz linear array US transducer and 850 nm excitation wavelength LED arrays to image blood vessels in a subcutaneous tumor model. After imaging, the tumors were sectioned and stained for endothelial cells to correlate with PA images across similar cross-sections. Analysis of 30 regions of interest in tumors from different mi...
Source: Sensors - August 11, 2020 Category: Biotechnology Authors: Marvin Xavierselvan Mithun Kuniyil Ajith Singh Srivalleesha Mallidi 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 6656: Vascular Auscultation of Carotid Artery: Towards Biometric Identification and Verification of Individuals
Conclusion: The proposed approach and processing pipeline appeared promising for the discrimination of individuals. The biometrical recognition could clinically be used to obtain and highlight differences from a previously established personalized audio profile and subsequently could provide information on the source of the deviation as well as on its effects on the individual’s health. The limited number of individuals and recordings require a study in a larger population along with an investigation of the long-term spectral stability of carotid sounds to assess its potential as a biometric marker. Nevertheless, the app...
Source: Sensors - October 7, 2021 Category: Biotechnology Authors: Rutuja Salvi Patricio Fuentealba Jasmin Henze Pinar Bisgin Thomas S ühn Moritz Spiller Anja Burmann Axel Boese Alfredo Illanes Michael Friebe 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 2302: Investigation of Flow Changes in Intracranial Vascular Disease Models Constructed with MRA Images
This study aimed to develop a magnetic resonance imaging (MRI)-compatible flow delivery system and individualized models of circle of Willis (CoW), which include 50% and 100% blockage in internal carotid artery (ICA50 and ICA100), and 100% blockage in vertebral artery (VA100). Images were obtained using 3D time-of-flight and phase-contrast magnetic resonance angiography (MRA) sequences, and changes in velocity and flow direction at CoW models were analyzed. For the ICA50 and VA100 models, the flow was similar to that of the normal model. For the ICA 50 model, it was found that 50% blockage did not affect cerebral blood flo...
Source: Sensors - March 16, 2022 Category: Biotechnology Authors: Jeong-Heon Kim Ju-Yeon Jung Yeong-Bae Lee Chang-Ki Kang 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
