Repositório IC-Online
Repositório Científico da Instituição
Entradas recentes
Quaternion Hyperbolic Transforms of the Fourier Type: An Overview
Publication . Ferreira, M.; Morais, J.
Quaternion Hyperbolic Transforms of the Fourier type associated with quaternion-valued signals defined over an open rectangle of the Euclidean plane endowed with a hyperbolic measure include the Fourier, Wigner-Ville, and linear canonical transforms. In this paper, we give a descriptive review of these generalized transforms and provide some of their important properties. The different forms of the hyperbolic kernels of such transforms contain hyperbolic spatial variables and frequency variables together with two quaternion algebra generators that take over the role of imaginary units (an essential feature to maintain the separation between the two dimensions).
A Systematic Review on Deep Learning with CNNs Applied to Surface Defect Detection
Publication . Cumbajin, Esteban; Rodrigues, Nuno; Costa, Paulo; Miragaia, Rolando; Frazão, Luís; Costa, Nuno; Fernández-Caballero, Antonio; Carneiro, Jorge; Buruberri, Leire H.; Pereira, António
Surface defect detection with machine learning has become an important tool in industries and a large field of study for researchers or workers in recent years. It is necessary to have a simplified source of information that helps us to better focus on one type of surface. In this systematic review, we present a classification for surface defect detection based on convolutional neural networks (CNNs) focused on surface types. Findings: Out of 253 records identified, 59 primary studies were eligible. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, we analyzed the structures of each study and the concepts related to defects and their types on surfaces. The presented review is mainly focused on finding a classification for the types of surfaces most used in industry (metal, building, ceramic, wood, and special). We delve into the specifics of each surface category, offering illustrative examples of their applications within both industrial and laboratory settings. Furthermore, we propose a new taxonomy of machine learning based on the obtained results and collected information. We summarized the studies and extracted the main characteristics such as type of surface, problem types, timeline, type of network, techniques, and datasets. Among the most relevant results of our analysis, we found that the metallic surface is the most used, as it is the one found in 62.71% of the studies, and the most prevalent problem type is classification, accounting for 49.15% of the total. Furthermore, we observe that transfer learning was employed in 83.05% of the studies, while data augmentation was utilized in 59.32%. Our findings also provide insights into the cameras most frequently employed, along with the strategies adopted to address illumination challenges present in certain articles and the approach to creating datasets for real-world applications. The main results presented in this review allow for a quick and efficient search of information for researchers and professionals interested in improving the results of their defect detection projects. Finally, we analyzed the trends that could open new fields of study for future research in the area of surface defect detection.
How much is a chef’s touch worth? Affective, emotional and behavioural responses to food images: A multimodal study
Publication . Rosa, Pedro J.; Madeira, Arlindo; Oliveira, Jorge; Palrão, Teresa; Abbas, Alhamzah F.
Background Food aesthetics influences affective dimensions (valence and arousal) and subsequent emotional and behavioural responses in images presented in more traditional form, almost rustic in some cases, to the signature dishes of haute cuisine. However, the visual impact of images of haute cuisine dishes on consumers’ affective and emotional responses compared to traditional dishes is still understudied. Methods We recorded electrodermal activity, ocular movements and self-report affect of 35 volunteers while they performed a picture viewing paradigm using images of haute cuisine food, traditional food, and non-food. Additionally, the moderating role of age was examined. Results Our results showed that subjects had higher feelings of pleasure and arousal toward images of food (haute cuisine and traditional dishes) compared to non-food images. However, no difference in self-report affect, physiological and behavioural responses was found between haute cuisine and traditional dishes. Interestingly, a moderating effect of age was revealed, reporting that younger participants had greater feelings of pleasure and shorter eye-to-screen distance towards traditional food than haute cuisine. Conclusions As a whole, our findings suggest that food aesthetics could at least partially affect consumers’ affective and emotional responses. Interestingly, physiological responses to food pictures seemed to be relatively independent of approach/avoidance motivational states, supporting the assumption that traditional visual restaurant menus with attractive images might be insufficient for eliciting intense positive emotions. This study also contributes to advancing the understanding of the role that age plays in emotional impact when images of haute cuisine dishes are presented to consumers.
Considerations for the Use of Alloplastic Temporomandibular Joint Replacement in Irradiated Patients: Report of an Off-Label Indication
Publication . Ângelo, David Faustino; Maffia, Francesco; Teschke, Marcus; Sanz, David; Galrito, Marta; Cardoso, Henrique; Marques, Rute; Nabuco, Carlos
Background: Custom-made alloplastic temporomandibular joint replacement (ATMJR) is not validated in irradiated patients. However, in specific situations, after previous reconstructive surgical failures, the authors hypothesized the role of a customized ATMJR after radiotherapy. Methods: A 65-year-old male patient was referred to Instituto Português da Face—Lisbon, Portugal—after failed attempts of mandibular reconstruction secondary to oral carcinoma resection and partial hemi-mandibulectomy plus radiotherapy of 60 total Grays. Primary reconstruction was performed with fibula free flap. Due to failure, secondary reconstructions were performed with osteosynthesis plate without success. The patient was unable to have adequate mastication and deglutition due to a severe crossbite. The authors treated the patient with an extended customized alloplastic temporomandibular joint replacement (F0M2). Results: With 3 years of follow-up, the patient showed an improvement in masticatory function, mandibular motion, pain levels, and overall quality of life. No complications were observed related to ATMJR. Conclusions: The presented case described how ATMJR, although not a validated option after radiotherapy, can be considered to restore functionality in complex cases with bone and soft tissues problems.
“What Do We Know about Hope in Nursing Care?”: A Synthesis of Concept Analysis Studies
Publication . Antunes, Mónica; Laranjeira, Carlos; Querido, Ana; Charepe, Zaida
Hope is a central concept within the nursing literature, which is crucial towards the development of nursing knowledge. Nursing teams play a crucial role in exploring the meaning of hope and promoting hope among patients and their families. This study aims to synthesize concept analysis studies of hope in the context of nursing care and to propose an evidence-based update of the definition of hope in the International Classification for Nursing Practice (ICNP®). Method: This is a literature review, involving the synthesis of studies concerning the concept analysis of hope in nursing practice. Peer-reviewed articles with fully accessible Portuguese or English text were considered. As we aimed to include a historical perspective of the concept, no restriction upon the time of publication was set. Articles were selected in March 2022 and updated in July 2023 using the Medline, CINAHL, and Scopus databases. The search terms used were “hope” AND “concept” AND “analysis” AND “nurs*”. Only articles written in English or Portuguese were included. Two reviewers conducted the research synthesis and report independently to minimize the risk of bias in the included studies. This paper adheres to the PRISMA checklist. To clarify the concept of hope as perceived by patients and develop hope as an evidence-based nursing concept, 13 studies were reviewed. The concept of hope, its attributes, antecedents, and consequences, as well as similar concepts, were studied by nurses and synthesized into a definition. The identified antecedents include pivotal life events, stressful stimuli, and experiencing satisfaction with life. The analysis of its attributes, antecedents, and consequences has contributed to understanding its relevance in nursing care and provided a proposed update of hope in the ICNP®. This review provides conceptual clarity on how hope is defined and used in nursing practice and the potential factors that may impact the promotion of hope to provide opportunities for future nursing research.