2022
Authors
Pinto, VH; Soares, IN; Ribeiro, F; Lima, J; Goncalves, J; Costa, P;
Publication
CONTROLO 2022
Abstract
Legged-wheeled locomotion systems are a particular case of robot types that can be characterized by an increase in the degrees of freedom. To increase safety and robustness in the performance of industrial robots, while reducing the risk of damage to the robot joints and injure to human operators, the use of non-rigid joints is growing in the literature and in the industry. Realistic simulators are tools capable of detecting rigid bodies interactions through physics engines. This paper presents the simulation model of a hybrid legged-wheeled robot, built in the SimTwo simulator. The proposed algorithms for path following control are detailed, along with the tests performed to them. These showed that the errors in linear paths are at most 1 cm. For circular paths, the maximum error is 3 cm.
2022
Authors
Agostinho, LR; Ricardo, NM; Pereira, MI; Hiolle, A; Pinto, AM;
Publication
IEEE ACCESS
Abstract
The expansion of autonomous driving operations requires the research and development of accurate and reliable self-localization approaches. These include visual odometry methods, in which accuracy is potentially superior to GNSS-based techniques while also working in signal-denied areas. This paper presents an in-depth review of state-of-the-art visual and point cloud odometry methods, along with a direct performance comparison of some of these techniques in the autonomous driving context. The evaluated methods include camera, LiDAR, and multi-modal approaches, featuring knowledge and learning-based algorithms, which are compared from a common perspective. This set is subject to a series of tests on road driving public datasets, from which the performance of these techniques is benchmarked and quantitatively measured. Furthermore, we closely discuss their effectiveness against challenging conditions such as pronounced lighting variations, open spaces, and the presence of dynamic objects in the scene. The research demonstrates increased accuracy in point cloud-based methods by surpassing visual techniques by roughly 33.14% in trajectory error. This survey also identifies a performance stagnation in state-of-the-art methodologies, especially in complex conditions. We also examine how multi-modal architectures can circumvent individual sensor limitations. This aligns with the benchmarking results, where the multi-modal algorithms exhibit greater consistency across all scenarios, outperforming the best LiDAR method (CT-ICP) by 5.68% in translational drift. Additionally, we address how current AI advances constitute a way to overcome the current development plateau.
2022
Authors
Ferreira-Santos, D; Pereira Rodrigues, P;
Publication
Journal of Medical Internet Research
Abstract
2022
Authors
Huber, M; Boutros, F; Luu, AT; Raja, K; Ramachandra, R; Damer, N; Neto, PC; Goncalves, T; Sequeira, AF; Cardoso, JS; Tremoco, J; Lourenco, M; Serra, S; Cermeno, E; Ivanovska, M; Batagelj, B; Kronovsek, A; Peer, P; Struc, V;
Publication
2022 IEEE INTERNATIONAL JOINT CONFERENCE ON BIOMETRICS (IJCB)
Abstract
This paper presents a summary of the Competition on Face Morphing Attack Detection Based on Privacy-aware Synthetic Training Data (SYN-MAD) held at the 2022 International Joint Conference on Biometrics (IJCB 2022). The competition attracted a total of 12 participating teams, both from academia and industry and present in 11 different countries. In the end, seven valid submissions were submitted by the participating teams and evaluated by the organizers. The competition was held to present and attract solutions that deal with detecting face morphing attacks while protecting people's privacy for ethical and legal reasons. To ensure this, the training data was limited to synthetic data provided by the organizers. The submitted solutions presented innovations that led to outperforming the considered baseline in many experimental settings. The evaluation benchmark is now available at: https://github.com/marcohuber/SYN-MAD-2022.
2022
Authors
Nikoobakht, A; Aghaei, J; Shafie-khah, M; Catalao, JPS;
Publication
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
Abstract
Nowadays, risk-averse management is a principal concern for transmission system (TS) operator that involvedifferent types of uncertainty including continuous uncertainties (e.g., wind energy uncertainty) and discreteuncertainties (e.g., generator/line outages). In this condition, risk-averse decision making for managing theseuncertainties are extremely complex, and the complexity is more amplified by the worst-case uncertainties.Accordingly, in this study a novel contingency-constrained information gap decision theory (CC-IGDT)approach has been proposed to cope with worst-case continuous and discrete uncertainties. Also, activedistribution systems (ADSs) with distributed energy resources are important components in a TS, and canplay an important role in addressing the issue of risk-averse management for TS operator. Therefore, in thisstudy a coupled operation model for the TS & ADSs with the CC-IGDT approach has been proposed. But, solveproposed coupled operation model is problematic, thus, to solve this problem a new four-level hierarchicaloptimization technique has been proposed. Finally, the IEEE 30-bus transmission and IEEE 33-bus distributionsystems have been analyzed to show the effectiveness of the proposed CC-IGDT approach and the co-operationof TS & ADSs.
2022
Authors
Costa, T; Coelho, L; Silva, MF;
Publication
BIOENGINEERING-BASEL
Abstract
Diabetic peripheral neuropathy is a major complication of diabetes mellitus, and it is the leading cause of foot ulceration and amputations. The Semmes-Weinstein monofilament examination (SWME) is a widely used, low-cost, evidence-based tool for predicting the prognosis of diabetic foot patients. The examination can be quick, but due to the high prevalence of the disease, many healthcare professionals can be assigned to this task several days per month. In an ongoing project, it is our objective to minimize the intervention of humans in the SWME by using an automated testing system relying on computer vision. In this paper we present the project's first part, constituting a system for automatically identifying the SWME testing sites from digital images. For this, we have created a database of plantar images and developed a segmentation system, based on image processing and deep learning-both of which are novelties. From the 9 testing sites, the system was able to correctly identify most 8 in more than 80% of the images, and 3 of the testing sites were correctly identified in more than 97.8% of the images.
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