140 research outputs found
Data fusion using ultra wideband time-of-flight positioning for mobile robot applications
Self-localization of a robot is one of the most important requirements in mobile robotics. There are several approaches to providing localization data. The Ultra Wide Band Time of Flight provides position information but lacks the angle. Odometry data can be combined by using a data fusion algorithm. This paper addresses the application of data fusion algorithms based on odometry and Ultra Wide Band Time of Flight positioning using a Kalman filter that allows performing the data fusion task which outputs the position and orientation of the robot. The proposed solution, validated in a real developed platform can be applied in service and industrial robots.he authors are grateful to the Foundation for Sci- ence and Technology (FCT, Portugal) for financial support through national funds FCT/MCTES (PIDDAC) to CeDRI (UIDB/05757/2020 and UIDP/05757/2020) and SusTEC (LA/P/0007/2021). This work has been supported by NORTE- 01-0247-FEDER-072598 iSafety: Intelligent system for occu- pational safety and well-being in the retail sector. The authors also want to thank CEFET-RJ and FAPERJ.info:eu-repo/semantics/publishedVersio
Simulation and evaluation of deep learning autoencoders for image compression in multi-UAV network systems
Mobile multi-robot systems are versatile alternatives
for improving single-robot capacities in many applications, such
as logistics, environmental monitoring, search and rescue, photogrammetry,
etc. In this sense, this kind of system must have a
reliable communication network between the vehicles, ensuring
that information exchanged within the nodes has little losses. This
work simulates and evaluates the use of autoencoders for image
compression in a multi-UAV simulation with ROS and Gazebo
for a generic surveillance application. The autoencoder model
was developed with the Keras library, presenting good training
and validation results, with training and validation accuracy
of 70%, and a Peak Signal Noise Ratio (PSNR) of 40dB. The
use of the CPU for the simulated UAVs for processing and
sending compressed images through the network is 25% faster.
The results showed that this compression methodology is a good
choice for improving the system’s performance without losing too
much information.The authors thank CEFET/RJ, UFF, UFRJ, and the Brazilian
research agencies CAPES, CNPq, and FAPERJ. Besides, the authors are grateful to the Foundation for Science and Technology
(FCT, Portugal) for financial support through national
funds FCT/MCTES (PIDDAC) to CeDRI (UIDB/05757/2020
and UIDP/05757/2020) and SusTEC (LA/P/0007/2021).info:eu-repo/semantics/publishedVersio
Enhancing motivation and learning in engineering courses: a challenge-based approach to teaching embedded systems
This paper addresses an approach to teaching embedded
systems programming through a challenge-based competition
involving robots. This pedagogical project distinguishes
itself by incorporating international students from three international
institutions through the Blended Intensive Program (BIP).
The research findings indicate that this approach yields excellent
results regarding student engagement and learning outcomes. The
challenge-based program effectively promotes students’ creative
problem-solving abilities by combining theoretical instruction
with hands-on experience in a competitive setting.The authors are grateful to the Foundation for Science
and Technology (FCT, Portugal) for financial support
through national funds FCT/MCTES (PIDDAC) to
CeDRI (UIDB/05757/2020 and UIDP/05757/2020), SusTEC
(LA/P/0007/2021) and project LA/P/0063/2020. This work
was supported by Blended Intensive Programme ID: 2021-
1-PT01-KA131-HED-000004268-2, Embedded Systems Applications.
The authors thank CEFET/RJ, the Institute of
Engineering and the Research Centre on Bio-based Economy
of Hanze University of Applied Sciences, the ERASMUS
program, and the Brazilian research agencies CAPES, CNPq,
and FAPERJ.info:eu-repo/semantics/publishedVersio
A Framework for Analyzing Fog-Cloud Computing Cooperation Applied to Information Processing of UAVs
Unmanned aerial vehicles (UAVs) are a relatively new technology. Their
application can often involve complex and unseen problems. For instance, they
can work in a cooperative-based environment under the supervision of a ground
station to speed up critical decision-making processes. However, the amount of
information exchanged among the aircraft and ground station is limited by high
distances, low bandwidth size, restricted processing capability, and energy
constraints. These drawbacks restrain large-scale operations such as large area
inspections. New distributed state-of-the-art processing architectures, such as
fog computing, can improve latency, scalability, and efficiency to meet time
constraints via data acquisition, processing, and storage at different levels.
Under these amendments, this research work proposes a mathematical model to
analyze distribution-based UAVs topologies and a fog-cloud computing framework
for large-scale mission and search operations. The tests have successfully
predicted latency and other operational constraints, allowing the analysis of
fog-computing advantages over traditional cloud-computing architectures.Comment: Volume 2019, Article ID 7497924, 14 page
Control tunning approach and digital filter application for competitive line follower robot
This research describes the development of a control
strategy to optimize a competitive line follower robot for standard
races. The innovative approach stems from the WolfBotz team
at CEFET/RJ, presenting a thorough exploration of mathematical
foundations, hardware design, control analysis, and how
to implement this system in a microcontroller. This research
complements a previous work that shows all the regulations used
in Brazilian competitions and describes the controllers used in
the system, such as angular and linear control. This research
emphasizes all the changes between the two versions of Line
Follower robots. The emphasis on mathematical foundations and
integrating digital signal processing techniques like digital filters
set the stage for robust sensor data interpretation. The tuning
and optimization of dual controllers for track stability and linear
velocity regulation represent a significant innovation, augmenting
the robot’s overall performance.The authors would like to thank CEFET/RJ and the Brazilian
research agencies CAPES, CNPq, and FAPERJ for supporting
this work. Besides, the authors are grateful to the
Foundation for Science and Technology (FCT, Portugal) for
financial support through national funds FCT/MCTES (PIDDAC)
to CeDRI (UIDB/05757/2020 and UIDP/05757/2020)
and SusTEC (LA/P/0007/2021).info:eu-repo/semantics/publishedVersio
Fuzzy Gain-Scheduling PID for UAV Position and Altitude Controllers
Unmanned aerial vehicle (UAV) applications have evolved to a wide range of fields in the last decade. One of the main challenges in autonomous tasks is the UAV stability during maneuvers. Thus, attitude and position control play a crucial role in stabilizing the vehicle in the desired orientation and path. Many control techniques have been developed for this. However, proportional integral derivative (PID) controllers are often used due their structure and efficiency. Despite PID’s good performance, different requirements may be present at different mission stages. The main contribution of this research work is the development of a novel strategy based on a fuzzy-gain scheduling mechanism to adjust the PID controller to stabilize both position and altitude. This control strategy must be effective, simple, and robust to uncertainties and external disturbances. The Robot Operating System (ROS) integrates the proposed system and the flight control unit. The obtained results showed that the proposed approach was successfully applied to the trajectory tracking and revealed a good performance compared to conventional PID and in the presence of noises. In the tests, the position controller was only affected when the altitude error was higher, with an error of 2% lower.publishedVersio
The impact of educational robots as learning tools in specific technical classes in undergraduate education
The use of mobile robots in the classroom has gained
increasing attention in recent years due to their potential to
enhance student engagement and facilitate personalized learning.
This research presents the insertion of mobile robots as a
hands-on learning experience in Control and Servomechanisms
II and Signal Processing II classes. This work also addresses
the challenges and limitations of using mobile robots in the
classroom, including technical difficulties. The students were
evaluated during the code implementation in the practical
exercises. Besides, a form was provided to them in order to
assess the impact of these robots as part of the pedagogical
practice. From the students’ positive feedback, it was possible to
conclude that the mobile robots were well-accepted. Besides, the
robots enhanced Control Systems classes and improved students’
learning outcomes.The authors would like to thank CEFET/RJ, UFF, UFRJ,
and the Brazilian research agencies CAPES, CNPq, and
FAPERJ. Besides, the authors are grateful to the Foundation
for Science and Technology (FCT, Portugal) for financial
support through national funds FCT/MCTES (PIDDAC)
to CeDRI (UIDB/05757/2020 and UIDP/05757/2020) and
SusTEC (LA/P/0007/2021).info:eu-repo/semantics/publishedVersio
Adaptive path planning for fusing rapidly exploring random trees and deep reinforcement learning in an agriculture dynamic environment UAVs
Unmanned aerial vehicles (UAV) are a suitable solution for monitoring growing cultures due to the possibility of covering a large area and the necessity of periodic monitoring. In inspection and monitoring tasks, the UAV must find an optimal or near-optimal collision-free route given initial and target positions. In this sense, path-planning strategies are crucial, especially online path planning that can represent the robot’s operational environment or for control purposes. Therefore, this paper proposes an online adaptive path-planning solution based on the fusion of rapidly exploring random trees (RRT) and deep reinforcement learning (DRL) algorithms applied to the generation and control of the UAV autonomous trajectory during an olive-growing fly traps inspection task. The main objective of this proposal is to provide a reliable route for the UAV to reach the inspection points in the tree space to capture an image of the trap autonomously, avoiding possible obstacles present in the environment. The proposed framework was tested in a simulated environment using Gazebo and ROS. The results showed that the proposed solution accomplished the trial for environments up to 300 m3 and with 10 dynamic objects.The authors would like to thank the following Brazilian Agencies CEFET-RJ, CAPES, CNPq, and FAPERJ. The authors also want to thank the Research Centre in Digitalization and Intelligent Robotics (CeDRI), Instituto Politécnico de Bragança–IPB (UIDB/05757/2020 and UIDP/05757/2020), the Foundation for Science and Technology (FCT, Portugal) for financial support through national funds FCT/MCTES (PIDDAC) to CeDRI, and Laboratório Associado para a Sustentabilidade e Tecnologia em Regiões de Montanha (SusTEC) and IPB, Portugal. This work was carried out under the Project “OleaChain: Competências para a sustentabilidade e inovação da cadeia de valor do olival tradicional no Norte Interior de Portugal” (NORTE-06-3559-FSE-000188), an operation to hire highly qualified human resources, funded by NORTE 2020 through the European Social Fund (ESF).info:eu-repo/semantics/publishedVersio
Cooperative heterogeneous robots for autonomous insects trap monitoring system in a precision agriculture scenario
The recent advances in precision agriculture are due to the emergence of modern robotics systems. For instance, unmanned aerial systems (UASs) give new possibilities that advance the solution of existing problems in this area in many different aspects. The reason is due to these platforms’ ability to perform activities at varying levels of complexity. Therefore, this research presents a multiple-cooperative robot solution for UAS and unmanned ground vehicle (UGV) systems for their joint inspection of olive grove inspect traps. This work evaluated the UAS and UGV vision-based navigation based on a yellow fly trap fixed in the trees to provide visual position data using the You Only Look Once (YOLO) algorithms. The experimental setup evaluated the fuzzy control algorithm applied to the UAS to make it reach the trap efficiently. Experimental tests were conducted in a realistic simulation environment using a robot operating system (ROS) and CoppeliaSim platforms to verify the methodology’s performance, and all tests considered specific real-world environmental conditions. A search and landing algorithm based on augmented reality tag (AR-Tag) visual processing was evaluated to allow for the return and landing of the UAS to the UGV base. The outcomes obtained in this work demonstrate the robustness and feasibility of the multiple-cooperative robot architecture for UGVs and UASs applied in the olive inspection scenario.The authors would like to thank the Foundation for Science and Technology (FCT, Portugal) for financial support through national funds FCT/MCTES (PIDDAC) to CeDRI (UIDB/05757/2020 and UIDP/05757/2020) and SusTEC (LA/P/0007/2021). In addition, the authors would like to thank the following Brazilian Agencies CEFET-RJ, CAPES, CNPq, and FAPERJ. In addition, the authors also want to thank the Research Centre in Digitalization and Intelligent Robotics (CeDRI), Instituto Politécnico de Braganca (IPB) - Campus de Santa Apolonia, Portugal, Laboratório Associado para a Sustentabilidade e Tecnologia em Regiões de Montanha (SusTEC), Portugal, INESC Technology and Science - Porto, Portugal and Universidade de Trás-os-Montes e Alto Douro - Vila Real, Portugal. This work was carried out under the Project “OleaChain: Competências para a sustentabilidade e inovação da cadeia de valor do olival tradicional no Norte Interior de Portugal” (NORTE-06-3559-FSE-000188), an operation used to hire highly qualified human resources, funded by NORTE 2020 through the European Social Fund (ESF).info:eu-repo/semantics/publishedVersio
Parkinson's Disease DJ-1 L166P Alters rRNA Biogenesis by Exclusion of TTRAP from the Nucleolus and Sequestration into Cytoplasmic Aggregates via TRAF6
Mutations in PARK7/DJ-1 gene are associated to autosomal recessive early onset forms of Parkinson's disease (PD). Although large gene deletions have been linked to a loss-of-function phenotype, the pathogenic mechanism of missense mutations is less clear. The L166P mutation causes misfolding of DJ-1 protein and its degradation. L166P protein may also accumulate into insoluble cytoplasmic aggregates with a mechanism facilitated by the E3 ligase TNF receptor associated factor 6 (TRAF6). Upon proteasome impairment L166P activates the JNK/p38 MAPK apoptotic pathway by its interaction with TRAF and TNF Receptor Associated Protein (TTRAP). When proteasome activity is blocked in the presence of wild-type DJ-1, TTRAP forms aggregates that are localized to the cytoplasm or associated to nucleolar cavities, where it is required for a correct rRNA biogenesis. In this study we show that in post-mortem brains of sporadic PD patients TTRAP is associated to the nucleolus and to Lewy Bodies, cytoplasmic aggregates considered the hallmark of the disease. In SH-SY5Y neuroblastoma cells, misfolded mutant DJ-1 L166P alters rRNA biogenesis inhibiting TTRAP localization to the nucleolus and enhancing its recruitment into cytoplasmic aggregates with a mechanism that depends in part on TRAF6 activity. This work suggests that TTRAP plays a role in the molecular mechanisms of both sporadic and familial PD. Furthermore, it unveils the existence of an interplay between cytoplasmic and nucleolar aggregates that impacts rRNA biogenesis and involves TRAF6
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