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DA UNIVERSIDADE PORTUCALENSE
Entradas recentes
Sodet-synthetic oversampling decision trees
2026-04-19 - Costa, Joaquim Fernando Pinto da; Alonso, Hugo
In this work, we present a novel methodology for decision trees that use oversampling, not before tree construction (in the entire dataset), but inside each internal node (and corresponding input space region) of the tree. This strategy proves to be successful in fighting the greedy nature of decision trees. We take also into consideration the nature of the input variables, not just quantitative or binary, and also introduce the use of novel distances between instances that can also be used in other contexts. The application of our methodology to a significant number of datasets, thirteen, both balanced and imbalanced problems, shows the relevance of our approach when compared to CART and C5.0. Although our experiments were conducted on a standard computing platform, the proposed approach is well suited for high-performance computing environments, since node-level oversampling and distance computations can be efficiently parallelized, enabling the method to scale to large and high-dimensional datasets.
Liminal Landscapes: Generative Art as a Technoshanic Instrument in the Representation of Altered States of Consciousness
2026-04-13 - Simão, Emília; Moura, João Martinho; Brandão, Daniel
This article proposes a theoretical and practical reflection on the capacity of generative audiovisual installations to represent and evoke altered states of consciousness, based on the artistic project Liminal Landscapes. In a historical moment marked by crises of meaning, technological alienation, and symbolic disintegration, a new sensibility emerges that seeks to resume ecstatic and spiritual experiences, now mediated by digital devices. By cross-referencing from the visionary arts, the anthropology of ritual, technoshamanism and media arts, it is argued that certain contemporary artistic creations can assume functions comparable to those of ancestral shamanic rituals, enabling the public to have immersive, introspective, and liminal experiences. The installation Liminal Landscapes develops from organic and generative processes of image and sound, symbolically focusing on the element of water as a metaphor for the unconscious, crossing, and transformation. The circular structure of the work, combined with the enveloping sound and visual dissolution, invites the viewer to enter a meditative state, breaking with linear temporality and evoking ritual practices. Based on a practical research methodology, the project analyzes how the artistic gesture can function as a mediator between the visible and the invisible, the aesthetic and the spiritual. Art, in this context, is proposed as a technoshamanic instrument and a legitimate avenue for sensitive knowledge, capable of bridging the gap between the body, technology, landscape, and consciousness.
ARTECH '25: Proceedings of the 2025 12th International Conference on Digital and Interactive Arts: Media Art Cultures, Communities & Territories
2026-04-13 - Olivero, Lucas Fabian; Simão, Emília; Sá, Alberto; Fernandes-Marcos, Adérito
ARTECH 2025: 12th International Conference on Digital and Interactive Arts: Media Art Cultures, Communities & Territories Braga Portugal November 26 - 28, 2025.