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Publicações

2024

Exploring Mobile Device Accessibility: Challenges, Insights, and Recommendations for Evaluation Methodologies

Autores
Pereira, LS; Matos, M; Duarte, C;

Publicação
PROCEEDINGS OF THE 2024 CHI CONFERENCE ON HUMAN FACTORS IN COMPUTING SYTEMS (CHI 2024)

Abstract
With the ubiquitous use of mobile applications, it is paramount that they are accessible, so they can empower all users, including those with different needs. Determining if an app is accessible implies conducting an accessibility evaluation. While accessibility evaluations have been thoroughly studied in the web domain, there are still many open questions when evaluating mobile applications. This paper investigates mobile accessibility evaluation methodologies. We conducted four studies, including an examination of accessibility reports from European Member-states, interviews with accessibility experts, manual evaluations, and usability tests involving users. Our investigations have uncovered significant limitations in current evaluation methods, suggesting that the absence of authoritative guidelines and standards, similar to what exists for the web, but tailored specifically to mobile devices, hampers the effectiveness of accessibility evaluation and monitoring activities. Based on our findings, we present a set of recommendations aimed at improving the evaluation methodologies for assessing mobile applications' accessibility.

2024

Modelo de programación lineal entera mixta para optimización del tamaño del conductor en sistemas de distribución considerando la integración de comunidades energéticas locales - Mixed-integer linear programming model for optimal conductor sizing in distribution systems considering the integration of local energy communities

Autores
Tenesaca Caldas, MS; Agudo Guiracocha, MP; Franco Baquero, JF; Zambrano Asanza, SP;

Publicação
Simposio Internacional sobre la Calidad de la Energía Eléctrica - SICEL

Abstract
Este artículo presenta un modelo de programación lineal entera mixta para resolver el problema de selección óptima del tamaño del conductor en sistemas de distribución radial considerando la integración de comunidades energéticas locales. La operación en estado estable del sistema de distribución basado en inyecciones de corriente se modela utilizando técnicas de linealización. La formulación propuesta considera la presencia de comunidades energéticas locales y restricciones operativas tales como límites de magnitud de voltaje y corriente. La formulación presentada se probó en un sistema de distribución utilizado en la literatura especializada. Los resultados muestran la eficiencia del método y demuestran que el modelo puede ser utilizado como solución del problema de selección óptima del tamaño del conductor.

2024

Effect of the sustainability indicators within OSeMOSYS optimization transition scenarios

Autores
Ferreira-Martínez, D; Bechir, MH; López-Agüera, A;

Publicação
Energy Strategy Reviews

Abstract

2024

Perceived greenwashing and its impact on eco-friendly product purchase

Autores
Shojaei, AS; Barbosa, B; Oliveira, Z; Coelho, AMR;

Publicação
TOURISM & MANAGEMENT STUDIES

Abstract
The main aim of this article is to investigate the effect of perceived greenwashing on consumers' purchasing behavior of eco-friendly products. Twelve research hypotheses were defined based on contributions from the literature. To test these hypotheses, a quantitative methodology was employed, collecting data through an online survey (N = 270) and using SmartPLS for analysis. The results confirm that perceived both perceived greenwashing and perceived risk have a negative influence on consumer attitudes. While their direct effects on purchase intention were found to be insignificant, both perceived greenwashing and perceived risk had a significant negative indirect effect on purchase intention through attitude. Additionally, it was confirmed that purchase behavior is positively affected by attitude and by willingness to pay more. These results contribute to addressing the limited knowledge regarding the impact of consumers' perceived greenwashing on their behavior, especially concerning different product types. Furthermore, they provide valuable insights for managers, highlighting the importance of mitigating greenwashing and risk perceptions associated with eco-friendly products due to their indirect negative impacts on purchase intention and behavior.

2024

The GRAVITY young stellar object survey XI. Imaging the hot gas emission around the Herbig Ae star HD58647

Autores
Bouarour, YI; Lopez, RG; Sanchez-Bermudez, J; Garatti, ACO; Perraut, K; Aimar, N; Amorim, A; Berger, JP; Bourdarot, G; Brandner, W; Clénet, Y; de Zeeuw, PT; Dougados, C; Drescher, A; Eckart, A; Eisenhauer, F; Flock, M; Garcia, P; Gendron, E; Genzel, R; Gillessen, S; Grant, S; Heissel, G; Henning, T; Jocou, L; Kervella, P; Labadie, L; Lacour, S; Lapeyrere, V; Le Bouquin, JB; Léna, P; Linz, H; Lutz, D; Mang, F; Nowacki, H; Ott, T; Paumard, T; Perrin, G; Pineda, JE; Ribeiro, DC; Bordoni, MS; Shangguan, J; Shimizu, T; Soulain, A; Straubmeier, C; Sturm, E; Tacconi, L; Vincent, F;

Publicação
ASTRONOMY & ASTROPHYSICS

Abstract
Aims. We aim to investigate the origin of the HI Br gamma emission in young stars by using GRAVITY to image the innermost region of circumstellar disks, where important physical processes such as accretion and winds occur. With high spectral and angular resolution, we focus on studying the continuum and the HI Br gamma-emitting area of the Herbig star HD 58647. Methods. Using VLTI-GRAVITY, we conducted observations of HD 58647 with both high spectral and high angular resolution. Thanks to the extensive uv coverage, we were able to obtain detailed images of the circumstellar environment at a sub-au scale, specifically capturing the continuum and the Br gamma-emitting region. Through the analysis of velocity-dispersed images and photocentre shifts, we were able to investigate the kinematics of the HI Br gamma-emitting region. Results. The recovered continuum images show extended emission where the disk major axis is oriented along a position angle of 14 degrees. The size of the continuum emission at 5-sigma levels is similar to 1.5 times more extended than the sizes reported from geometrical fitting (3.69 mas +/- 0.02 mas). This result supports the existence of dust particles close to the stellar surface, screened from the stellar radiation by an optically thick gaseous disk. Moreover, for the first time with GRAVITY, the hot gas component of HD 58647 traced by the Br gamma has been imaged. This allowed us to constrain the size of the Br gamma-emitting region and study the kinematics of the hot gas; we find its velocity field to be roughly consistent with gas that obeys Keplerian motion. The velocity-dispersed images show that the size of the hot gas emission is from a more compact region than the continuum (2.3 mas +/- 0.2 mas). Finally, the line phases show that the emission is not entirely consistent with Keplerian rotation, hinting at a more complex structure in the hot gaseous disk.

2024

Cognitive Patterns for Developer Experience

Autores
Pinho, D; Aguiar, A; Amaral, V;

Publicação
EuroPLoP

Abstract
The need for software developers is growing in a world where software systems play multiple roles in our daily lives. Due to the mental nature of their work, we are driven to address their needs. The concept of developer experience (DX) was defined as an extension of user experience, focusing on the dual role developers have as users and creators. This paper proposes a pattern language that can assist developers in improving their developer experience. In addition, we present a selection of patterns that focus on the cognitive dimension of the mind: Infrastructure Alignment, Adeqate Skills, It Takes A Village, Learning From A Master, Written Knowledge, and Practice Makes Perfect.

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