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Publications

2022

Association between co-morbidities and prescribed drugs in obstructive sleep apnea suspected patients: an inductive rule learning approach (Preprint)

Authors
Ferreira-Santos, D; Pereira Rodrigues, P;

Publication
Journal of Medical Internet Research

Abstract

2022

SYN-MAD 2022: Competition on Face Morphing Attack Detection Based on Privacy-aware Synthetic Training Data

Authors
Huber, M; Boutros, F; Luu, AT; Raja, K; Ramachandra, R; Damer, N; Neto, PC; Gonçalves, T; Sequeira, AF; Cardoso, JS; Tremoço, J; Lourenço, M; Serra, S; Cermeño, 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

Risk-averse decision under worst-case continuous and discrete uncertaintiesin transmission system with the support of active distribution systems br

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

Automatic Segmentation of Monofilament Testing Sites in Plantar Images for Diabetic Foot Management

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.

2022

Subject Specific Lower Limb Joint Mechanical Assessment for Indicative Range Operation of Active Aid Device on Abnormal Gait

Authors
Rodrigues, C; Correia, M; Abrantes, J; Rodrigues, MAB; Nadal, J;

Publication
XXVII BRAZILIAN CONGRESS ON BIOMEDICAL ENGINEERING, CBEB 2020

Abstract
This study presents subject specific lower limb joint angular kinematic and dynamic analysis at time and frequency domain as well as joint mechanical work, power and dynamic stiffness assessment during normal gait, stiff knee gait and slow running for indicative range operation of personalized active gait aid device. Gait aid devices present increasing interest for the generalization of gait rehabilitation, as an answer to the growth demand of population with gait rehabilitation need, as well as the insufficient health care personnel. Nevertheless, the large costs and standardized equipment leave out many patients without gait rehabilitation, with the need for low cost, personalized gait rehabilitation equipment, based on subject-specific analysis. In vivo and noninvasive case study was assessed of a healthy male subject 70 kg mass and 1.86 m height on human gait lab. Reflective adhesive marks were applied at skin surface of lower limb selected anatomical points and images captured with eight 100 Hz camera Qualisys along with ground reaction forces and force moments acquired at 2000 Hz with two AMTI force plates during foot contact with the ground on normal gait (NG) at comfortable auto-selected velocity, stiff knee gait (SKG) with lower knee flexion and slow running (SR) at minimum run velocity on stiff knee condition. Inverse kinematics and dynamics were performed using AnyGait with TLEM model and lower limb joint angular signal analyzed. Indicative range operation from lower limb joint mechanical assessment were obtained at complementary domain for subject specific gait aid device selection and parametrization.

2022

A two-stage joint operation and planning model for sizing and siting of electrical energy storage devices considering demand response programs br

Authors
Javadi, MS; Gough, M; Mansouri, SA; Ahmarinejad, A; Nematbakhsh, E; Santos, SF; Catalao, JPS;

Publication
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS

Abstract
This study describes a computationally efficient model for the optimal sizing and siting of Electrical Energy Storage Devices (EESDs) in Smart Grids (SG), accounting for the presence of time-varying electricity tariffs due to Demand Response Program (DRP) participation. The joint planning and operation problem for optimal siting and sizing of the EESD is proposed in a two-stage optimization problem. In this regard, the long-term decision variables deal were the size and location of the EESDs and have been considered at the master level while the operating point of the generation units and EESDs is determined by the slave stage of the model utilizing a standard mixed-integer linear programming model. To examine the effectiveness of the model in the slave sub- problem, the operation model is solved for different working days of different seasons. Binary Particle Swarm Optimization (BPSO) and Binary Genetic Algorithm (BGA) have been used at the master level to propose different scenarios for investment in the planning stage. The slave problem optimizes the model in terms of the short-term horizon (day-ahead). Additionally, the slave problem determines the optimal schedule for an SG considering the presence of EESD (with sizes and locations provided by the upper level). The electricity price fluctuates throughout the day, according to a Time-of-Use (ToU) DRP pricing scheme. Moreover, the impacts of DRPs have been addressed in the slave stage. The proposed model is examined on a modified IEEE 24-Bus test system

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