XLIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Electrocardiogram exams are essential in the diagnosis of heart diseases in animals. However, manually segmenting the waves that compose an ECG is a laborious task. This work proposes an algorithm based on convolutional neural networks that accurately segments the P, QRS, and T waves in the cardiac complexes of dogs. The algorithm achieved a mean...

This work proposes a hierarchical approach for ship classification in optical images, aiming to improve the separation between classes with high visual similarity. The strategy employs two stages based on the YOLOv11 architecture, with the first stage using a generalist detector that groups similar classes to reduce classification complexity and the...

Esta pesquisa investiga a influência do áudio na atenção visual em vídeos imersivos, através da análise da dispersão das fixações oculares. Utilizando dados de rastreamento ocular de cerca de 20 observadores, foram comparadas medidas de dispersão espacial das fixações oculares registradas para vídeos com e sem áudio. Os resultados indicam que o áudio...

In this article, the performances of occupancy decisions in non-cooperative spectrum sensing (SS) via energy detection (ED) are studied based on tests with the Transceptor Brasil 6G, a potential (TV white space, TVWS) solution for remote and rural areas. Additional procedures such as varying the number of samples, the signal-to-noise ratio, and...

Reconfigurable Intelligent Surfaces (RIS) are anticipated to be a key enabling technology for beyond 5G (B5G) and 6G wireless networks, introducing the concept of a controllable radio environment. By dynamically shaping the propagation of electromagnetic waves, RIS can significantly enhance spectral efficiency and support communication in densely...

This paper introduces PointPCA2-RS, a lightweight version of PointPCA2 with emphasis on low computational resources usage. PointPCA2-RS optimizes the original PointPCA2 by re-implementing it using a different programming language, structure, and specific algorithmic details. Designed to evaluate visual quality, both projects extract identical features...

Esse trabalho examina uma amostra do ransomware WannaCry usando análise estática e dinâmica para compreender seu comportamento durante um ataque. Discutem-se os objetivos de cada análise e apresenta-se a configuração do ambiente controlado para estudo. Na análise estática, utiliza-se a ferramenta de análise de binários executáveis PeStudio para verificar...

Neste trabalho são apresentadas a análise das propriedades dielétricas da antena dos compósitos de ZnNb2O6 (ZNO) com CaTiO3 (CTO). As propriedades dielétricas na região de micro-ondas (MW) não mostram nenhuma mudança significativa na permissividade (ε'r), enquanto a adição de 10% mol de CTO resulta em um aumento na perda dielétrica (tg δ). A estabilidade...

This paper proposes a blind concurrent beamformer (BCB) algorithm that combines the Constant Modulus Algorithm (CMA) and Direct Decision (DD) in a cooperative structure. The proposed BCB is evaluated over a six-dipole uniform circular array in different interfering scenarios, and the results are compared with the classical supervised least mean squares...

This paper presents a metasurface comprised by slotted Fibonacci spiral-like unit-cells built on a copper laminate over a substrate, capable to control the reflection and transmission of linearly polarized (LP) microwaves. The spiral pattern is generated by seven iterations, where the ratio between external and internal slot boundaries obeys the golden...