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Publicações

2023

A Platform for the Study of Drug Interactions and Adverse Effects Prediction

Autores
Mendes, D; Camacho, R;

Publicação
BIOINFORMATICS AND BIOMEDICAL ENGINEERING, IWBBIO 2023, PT I

Abstract
This article reports on the development of a Web platform for the study of Adverse Drug Events (ADEs). The platform is able to import ADE episodes from official Web sites, like OpenFDA, analyse the chemistry of the drugs involved, together with patient data, and produce a potential explanation based on the drugs interactions. Each study uses chemical knowledge to enrich the information on the molecules involved in the episodes. Data Mining is then used to construct models that can help in the explanation of the ADE occurrence and to predict future events. This paper reports on the Web portal developed and the Data Mining experiments conducted to evaluate the quality, and potential explanations of the forecasted adverse reactions, using real reports of drug administration and the subsequent adverse events. The results showed that it was possible to predict the outcomes of ADEs based on the structure of the molecules of the drugs involved and the data collected from real reports of drug administration up to an accuracy of 79%, while also predicting, with high accuracy, the severity of events where the outcome is the death of the patient (with a precision of 98.9%). The platform provides a less expensive and more accurate way of predicting adverse drug reactions compared to traditional methods. This study highlights the importance of understanding drug interactions at a molecular level and the usefulness of utilising Data Mining techniques in predicting ADEs.

2023

Policy gradients using variational quantum circuits

Autores
Sequeira, A; Santos, LP; Barbosa, LS;

Publicação
QUANTUM MACHINE INTELLIGENCE

Abstract
Variational quantum circuits are being used as versatile quantum machine learning models. Some empirical results exhibit an advantage in supervised and generative learning tasks. However, when applied to reinforcement learning, less is known. In this work, we considered a variational quantum circuit composed of a low-depth hardware-efficient ansatz as the parameterized policy of a reinforcement learning agent. We show that an epsilon-approximation of the policy gradient can be obtained using a logarithmic number of samples concerning the total number of parameters. We empirically verify that such quantum models behave similarly to typical classical neural networks used in standard benchmarking environments and quantum control, using only a fraction of the parameters. Moreover, we study the barren plateau phenomenon in quantum policy gradients using the Fisher information matrix spectrum.

2023

Eating behaviour and risk of eating disorders in higher education students

Autores
Costa, Carolina; Fernandes, Sandra; Nakamura, Ingrid; Poínhos, Rui; Bruno M P M Oliveira;

Publicação

Abstract

2023

Validation of Structural Equation Modeling Through Social Representation Theory in the Context of Governance

Autores
Marchisotti, GG; de Farias, JR; França, SLB; de Castro, HCGA; de Oliveira, FB;

Publicação
ADMINISTRACAO-ENSINO E PESQUISA

Abstract
This article proposes the use of social representation theory to validate the structural model of structural equation modeling, thereby enhancing the understanding of the research object. To achieve this, it was employed action research to construct, implement, and confirm the practical feasibility of the metho-dological procedures described herein. This was accomplished through their practical application in a case analysis. It was possible to validate the structural model used in structural equation modeling by applying the proposed methodological procedures to a case involving the governance system construct. This validation opens the possibility for future research to use these procedures in conjunction to validate theoretical models and the causal relationships between their constructs. Therefore, the primary theoretical contribution of this paper is the proposition of a research methodology that combines social representation theory with structural equation modeling to validate the structural model. This approach reduces the risk of using the statistical method to confirm or refute a theoretical model whose causal relationships may not represent a reality supported by practice.

2023

ICOPEV22. 5th International Conference on Production Economics and Project Evaluation. 29 – 30 September 2022, Polytechnic Institute of Castelo Branco, Castelo Branco, Portugal.

Autores
Farinha, L; Araújo, M; Rigueiro, C; Raposo, D; Neves, J; Anjos, O; Dionísio, R;

Publicação

Abstract
The 5th International Conference on Production Economics and Project Evaluation ICOPEV 2022 held on 29th – 30th of September 2022 in Castelo Branco, Portugal, continues the series of annual events shaping the future of Project Evaluation and Selection. Projects compete for scarce resources and choosing the best allocation of these resources is a complex and challenging task that decision makers face every day. The conference has covered a broad range of important and timely issues related to business intelligence, innovation & technology, project management, knowledge & technology trans-fer, energy issues, decision support systems, cost management, sustainability, innovation, and entrepreneurship. ICOPEV 2022 also featured keynote sessions and round tables. Our deepest appreciation goes to all that put in a lot of hard work of all who are involved in making this conference a success, including the organizing staff at Polytechnic Institute of Castelo Branco and the sponsors. In this conference participated authors from ten countries, namely Brazil, China, Chile, Colombia, Mexico, Poland, Portugal, Spain, and United Kingdom. The technical program is the result of the dedication and efforts of 56 members of the Scientific Committee as well as 37 reviewers, who have greatly contributed to the success of the ICOPEV 2022 paper review process, with an acceptance rate of 80%. The 2022 edition is the 5th conference since the inaugural event held in Guimarães, Portugal in 2011. The ICOPEV conferences follow a tradition of a high scientific quality and an informal atmosphere that fosters innovative and open discussions between academia and industry. Based on the many high-quality contributions in the technical program and interesting discussions during the conference, we are sure that this year edition in Castelo Branco was a worthy successor of the previous ICOPEV events.

2023

Hosting Capacity Enhancement Using Open-UPQC in LV Distribution Networks

Autores
Kazemi Robati, E; Hafezi, H; Faranda, R; Silva, B;

Publicação
2023 International Conference on Smart Energy Systems and Technologies, SEST 2023

Abstract
The deviation of the demand levels of the modern LV distribution systems due to the more loads and distributed generations connected in the same grid leads to the loss of acceptable quality of voltage. These voltage quality problems occur in case of the high difference between the power of the loads and distributed generations in the same area. Accordingly, the high loading conditions lead to the bus voltage decrease while the bus voltage increment occurs in scenarios with the excess of generation. In this condition, the successful voltage stabilization in MV/LV substation can effectively suppress the deviations of the grid voltage values and increase the hosting capacity of the network. There are different custom power devices introduced in the literature which can provide the stabilization of voltage in the grids. In this paper, among the available tools, the application of Open-UPQC is examined in hosting capacity improvement maintaining a desired power quality level; this capability is provided through the successful voltage regulation in the different probable high/low loading scenarios in the grid. According to the results, while the uncoordinated operation of the series and shunt devices does not have the capability of stabilization of the base grid, the Open-UPQC has successfully maintained the voltage profile inside the limits in both the base case and in the presence of high load and PV penetration levels. It should be emphasized that the services of the Open-UPQC are provided in an economical and effective way making the solution strategy applicable in real-world cases. © 2023 IEEE.

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