Mestrado em Ciência da Computação (INF)

URI Permanente para esta coleçãohttp://200.137.215.59/tede/handle/tde/225

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Agora exibindo 1 - 20 de 322

Estratégia de alocação dinâmica de recursos no Kubernetes para ambientes multi-inquilinos
(Universidade Federal de Goiás, 2025-10-15) Gabriel Eduardo de Bessa Maciel; Oliveira Junior, Antonio Carlos de; http://lattes.cnpq.br/3148813459575445; Oliveira Junior, Antonio Carlos de; http://lattes.cnpq.br/3148813459575445; Gomes, Raphael de Aquino; http://lattes.cnpq.br/4136576326278536; Santos, Carlos Eduardo da Silva; http://lattes.cnpq.br/5815707716439139; Freitas, Leandro Alexandre; http://lattes.cnpq.br/7450982711522425
The growing adoption of cloud-native applications has intensified the demand for efficient and secure multi-tenancy solutions in Kubernetes environments. However, dynamic resource allocation in shared environments presents significant challenges, requiring a balance between maximizing resource utilization and ensuring strict isolation between tenants. This study addresses these challenges by analyzing multi-tenant usage in Kubernetes, identifying its potential and limitations. Based on this analysis, we propose the Multi-Tenant Strategy for Kubernetes (EMK), which incorporates a Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS)-based algorithm for multi-criteria decision-making in dynamic resource allocation. This approach is integrated into a Kubernetes operator, enabling more efficient and automated tenant management while optimizing resource distribution in multi-tenant scenarios. The experimental evaluation was conducted in a Kubernetes cluster environment, considering different workload scenarios (light, moderate, and heavy). Performance indicators such as response time, allocation success rate, cluster flexibility, and adaptability were analyzed, all collected through Kubernetes’ native monitoring tools. The results demonstrated that the EMK reduces average latency and improves system stability under varying load conditions when compared to traditional allocation, highlighting greater efficiency and resilience in multi-tenant resource management.
SLArch: Arquitetura de Split Learning orientada a métricas de rede para desempenho de Redes Móveis B5G/6G
(Universidade Federal de Goiás, 2025-10-02) Reis, Cleyber Bezerra dos; Ribeiro, Maria do Rosário Campos; http://lattes.cnpq.br/1285706867893743; Oliveira Júnior, Antonio Carlos de; http://lattes.cnpq.br/3148813459575445; Oliveira Júnior, Antonio Carlos de; http://lattes.cnpq.br/3148813459575445; Ribeiro, Maria do Rosário Campos; http://lattes.cnpq.br/1285706867893743; Moreira Júnior, Waldir Aranha; http://lattes.cnpq.br/4552403112118292; Lopes, Victor Hugo Lázaro; http://lattes.cnpq.br/8690054906597785
Split Learning (SL) is a collaborative learning technique in which a neural network model is partitioned between client and server, enabling training without the need to share the original data. This study investigates the integration of SL with B5G/6G mobile networks using the ns-3 simulator and a convolutional neural network (CNN) trained on the MNIST dataset. We evaluated model-performance metrics, such as accuracy, as well as network indicators including packet loss, latency, throughput, and energy consumption. The results demonstrate that increasing transmit power reduces latency and improves model accuracy. The SL model exhibited performance variability with distance but maintained satisfactory accuracy (>80%) at distances up to 160 m in the highest-power scenario. These findings demonstrate the viability of SL as an enabling technology for next-generation mobile networks, optimising distributed training in communicationconstrained settings.
Aquisição Progressiva de Habilidades por meio de Curriculum Learning para Futebol de Robôs Multiagente
(Universidade Federal de Goiás, 2025-03-11) Guimarães, Werikcyano Lima; Soares, Telma Woerle de Lima; http://lattes.cnpq.br/6296363436468330; Soares, Telma Woerle de Lima; http://lattes.cnpq.br/6296363436468330; Salazar, Aldo André Diaz; http://lattes.cnpq.br/2265620121158672; Máximo, Marcos Ricardo Omena de Albuquerque; http://lattes.cnpq.br/1610878342077626
This work investigates the integration of Curriculum Learning with Self-play for rein- forcement learning in the context of SSL-EL robot soccer. The research addresses the challenge of developing efficient policies in complex multi-agent environments by proposing a structured methodology that decomposes learning into progressive stages. The implemented framework establishes adaptive criteria for transitioning between tasks, allowing agents to initially develop fundamental skills before facing complete competitive scenarios. The experimental results clearly demonstrate the superiority of the combined approach, with significantly higher win rates in competitive tournaments compared to traditional Full Self-play, as well as an expressive increase in the average goals per match. Additionally, a substantial reduction in total training time and greater stability in the learning process were observed, evidenced by metrics such as policy entropy, policy loss, and explained variance. The analyses confirm that Curriculum Learning provides a solid technical foundation that enhances the benefits of Self-play, resulting in agents with more sophisticated and efficient tactical capabilities.
Aprimoramento de dados para SFT em português brasileiro: um estudo com modelos de língua e avaliação com LLM-as- Judge
(Universidade Federal de Goiás, 2025-06-10) Rios, Walcy Santos Rezende; Galvão Filho, Arlindo Rodrigues; http://lattes.cnpq.br/7744765287200890; Galvão Filho, Arlindo Rodrigues; http://lattes.cnpq.br/7744765287200890; Oliveira , Sávio Salvarino Teles de; http://lattes.cnpq.br/1905829499839846; Soares, Telma Woerle de Lima; http://lattes.cnpq.br/6296363436468330
The scarcity of high-quality resources for Brazilian Portuguese (pt-br) hinders the development of effective language models adapted to the language's specificities. This work investigates the impact of synthetic enhancement of conversational data, using Large Language Models (LLMs), on the Supervised Fine-Tuning (SFT) of models from the Qwen2.5 family (0.5B, 1.5B, 3B). Based on the SmolTalk dataset, two versions were generated for ptbr: one by direct translation and another with responses synthetically enhanced and rewritten by the LLM Gemini 2.0 Flash. The Qwen2.5 models were trained on both datasets and comparatively evaluated using standardized objective benchmarks for Portuguese (ENEM, HATEBR, BLUEX, ASSIN2-RTE) and through qualitative evaluation of open-ended text generation (Alpaca-Eval-BR), using Claude 3.5 Haiku as LLM-as-Judge based on relevance, precision, comprehensiveness, usefulness, and coherence criteria. The results demonstrate a significant superiority of the models trained with synthetic data in the qualitative LLM-as- Judge evaluation across all metrics. In this evaluation, the normalized average F1-Score significantly increased with synthetic data: the 1.5B model achieved 44.45 (vs 14.05 for the translated, a ~216% gain) and the 3B model reached 57.21 (vs 16.79 for the translated, a ~241% gain). In contrast, on the objective benchmarks, the positive impact of synthetic enhancement was less pronounced, being more consistent only in the 3B parameter version. It is concluded that the LLM-assisted synthetic data enhancement strategy is effective in significantly raising the quality and performance of conversational language models for Brazilian Portuguese, representing a valuable approach to mitigate the scarcity of dedicated resources and advance the development of NLP technologies better adapted to the national context.synthetic data enhancement strategy is effective in significantly raising the quality and performance of conversational language models for Brazilian Portuguese, representing a valuable approach to mitigate the scarcity of dedicated resources and advance the development of NLP technologies better adapted to the national context.
Enhanced-ProBlock: adaptações em uma abordagem descentralizada, baseada em checagem humana e apoiada por blockchain para consenso ponderado na detecção de desinformação
(Universidade Federal de Goiás, 2025-05-26) Damacena, Pedro Henrique Campos; Borges, Vinicius da Cunha Martins; http://lattes.cnpq.br/6904676677900593; Lima; Borges, Vinicius da Cunha Martins; http://lattes.cnpq.br/6904676677900593; Lima, Eliomar Araújo de; http://lattes.cnpq.br/1362170231777201; Graciano Neto, Valdemar Vicente; http://lattes.cnpq.br/9864803557706493
Embargada.
Verificação semi-automática de fatos em português: enriquecimento de corpus via busca e extração de alegação
(Universidade Federal de Goiás, 2025-06-10) Gomes, Juliana Resplande Sant'Anna; Galvão Filho, Arlindo Rodrigues; http://lattes.cnpq.br/7744765287200890; Galvão Filho, Arlindo Rodrigues; http://lattes.cnpq.br/7744765287200890; Lima, Eliomar Araújo de; http://lattes.cnpq.br/1362170231777201; Soares, Telma de Woerle de Lima; http://lattes.cnpq.br/6296363436468330
The accelerated dissemination of disinformation often outpaces the capacity for manual fact-checking, highlighting the urgent need for Semi-Automated Fact-Checking (SAFC) systems. Within the Portuguese language context, there is a noted scarcity of publicly available datasets (corpora) that integrate external evidence, an essential component for developing robust AFC systems, as many existing resources focus solely on classification based on intrinsic text features. This dissertation addresses this gap by developing, applying, and analyzing a methodology to enrich Portuguese news corpora (Fake.Br, COVID19.BR, MuMiN-PT) with external evidence. The approach simulates a user’s verification process, employing Large Language Models (LLMs, specifically Gemini 1.5 Flash) to extract the main claim from texts and search engine APIs (Google Search API, Google FactCheck Claims Search API) to retrieve relevant external documents (evidence). Additionally, a data validation and preprocessing framework, including near-duplicate detection, is introduced to enhance the quality of the base corpora. The main results demonstrate the methodology’s viability, providing enriched corpora and analyses that confirm the utility of claim extraction, the influence of original data characteristics on the process, and the positive impact of enrichment on the performance of classification models (Bertimbau and Gemini 1.5 Flash), especially with fine-tuning. This work contributes valuable resources and insights for advancing SAFC in Portuguese.
Proposal and Evaluation of Efficient Pruning Approaches for Multi-Vector Representation in Passage Retrieval
(Universidade Federal de Goiás, 2025-06-13) Chihururu, Alex Michael; Rosa, Thierson Couto; http://lattes.cnpq.br/4414718560764818; Rosa, Thierson Couto; http://lattes.cnpq.br/4414718560764818; Brandão, Wladmir Cardoso; http://lattes.cnpq.br/4935788335854516; Martins, Wellington Santos; http://lattes.cnpq.br/3041686206689904
Multi-vector retrieval models employ bi-encoders to generate contextualized embeddings for queries and passages, and have proven highly effective in capturing fine-grained token-level interactions. Models such as ColBERT, ColBERTv2, and PLAID leverage all token-level output vectors from the encoder to accurately model query-passage relationships. However, storing dense vectors for every token in each passage results in substantial mem-ory overhead. Additionally, query latency is significantly affected by the computational cost of computing inner products between each query token and all passage tokens to obtain similarity scores. In this work, we explore pruning techniques applied to passage vectors produced by PLAID, aiming to remove less important token vectors to improve memory efficiency and reduce query processing time, with minimal impact on retrieval effectiveness. We propose two novel pruning methods: MLM Max with Token Reordering (MMTR) and TF-IDF pruning. We conducted extensive experiments on both in-domain and zero-shot (out-of-domain) datasets, following best-practice evaluation protocols. Our results show that MMTR consistently yields the smallest effectiveness drop compared to the original, unpruned PLAID model. We observe that retaining 50% of the passage to-ken embeddings provides the best trade-off between effectiveness, index size, and latency across most datasets. Interestingly, on certain out-of-domain datasets, pruning acts as a form of noise reduction—where retaining only 25% of the token embeddings leads to improved retrieval performance over the full, unpruned index.
Sliding puzzles gym: a scalable benchmark for state representation in visual reinforcement learning
(Universidade Federal de Goiás, 2025-01-09) Oliveira, Bryan Lincoln Marques de; Soares, Telma Woerle de Lima; http://lattes.cnpq.br/6296363436468330; Soares, Telma Woerle de Lima; http://lattes.cnpq.br/6296363436468330; Maximo, Marcos Ricardo Omena de Albuquerque; http://lattes.cnpq.br/1610878342077626; Vieira (, Flávio Henrique Teles; http://lattes.cnpq.br/0920629723928382
Embargada.
Channel-aware inter-slice scheduling for SLA assurance: theoretical and simulation-based approaches
(Universidade Federal de Goiás, 2025-06-20) Silva, Daniel Campos da; Cardoso, Kleber Vieira; http://lattes.cnpq.br/0268732896111424; Cardoso, Kleber Vieira; http://lattes.cnpq.br/0268732896111424; Rocha, Flávio Geraldo Coelho; http://lattes.cnpq.br/5583470206347446; Kibilda, Jacek
As the diversity of applications with heterogeneous Quality of Service (QoS) requirements grows in mobile networks, network slicing emerges as a key technology to meet Service Level Agreements (SLAs) by isolating resources among different types of services grouped into independent slices. Efficient inter-slice radio resource scheduling (RRS) is crucial in this context, directly governing the achievable throughput - and thus SLA assurance - while also enabling energy efficiency gains in low-demand scenarios through reduced resource usage and power consumption in the base station. This thesis investigates high-performance inter-slice RRS characteristics, including channelawareness, intra-slice RRS prediction, SLA-drift-oriented allocation, dynamic slice resource proportions, and fairness among users within the same slice. We formulate the RRS problem mathematically, facilitating the design of RRS heuristics approximating optimal solutions. Through simulations, we demonstrate how our proposed algorithms outperform state-of-the-art schedulers in both SLA assurance and resource efficiency.
Orquestração de recursos para a oferta de serviços, em infraestruturas híbridas de computação de borda e nuvem, com foco em aplicações de realidade mista
(Universidade Federal de Goiás, 2025-05-30) Fraga, Luciano de Souza; Pinto, Leizer de Lima; http://lattes.cnpq.br/0611031507120144; Cardoso, Kleber Vieira; http://lattes.cnpq.br/0268732896111424; Cardoso, Kleber Vieira; http://lattes.cnpq.br/0268732896111424; Pinto, Leizer de Lima; http://lattes.cnpq.br/0611031507120144; Rezende, José Ferreira de; http://lattes.cnpq.br/8588117212005149; Bueno, Elivelton Ferreira; http://lattes.cnpq.br/2764240045623948
Efficient resource allocation in hybrid edge-cloud computing environments is becoming increasingly important due to the growing adoption of mixed reality applications and the widespread use of devices with limited energy, processing, and memory resources. A welldesigned allocation strategy not only ensures compliance with the quality of service (QoS) requirements of these applications but also promotes optimized use of computational and network infrastructure, resulting in lower operational costs. In this work, we propose a model based on Integer Linear Programming (ILP) aimed at maximizing the fulfillment of demand generated by user devices, while minimizing the cost associated with the use of virtual machines responsible for processing. We evaluate the complexity of the model and propose structural simplifications, in addition to developing a heuristic designed to reduce solution generation time. Finally, we introduce a proactive approach based on a predictive model that anticipates resource usage patterns, contributing to more accurate decisions compared to reactive strategies. Experimental results demonstrate significant improvements in the volume of demand served when compared to other approaches in the literature, as well as highlight the benefits of adopting proactive strategies for resource allocation.
Segmentação dinâmica de objetos aplicada à odometria visual
(Universidade Federal de Goiás, 2024-10-02) Oliveira, Thiago Henrique de; Laureano, Gustavo Teodoro Laureano; http://lattes.cnpq.br/4418446095942420; Laureano, Gustavo Teodoro; http://lattes.cnpq.br/4418446095942420; Osório, Fernando Santos; http://lattes.cnpq.br/7396818382676736; Soares, Anderson da Silva; http://lattes.cnpq.br/1096941114079527
The presence of dynamic objects in a scene can significantly impair the performance of visual odometry methods. Even with the use of robust methods, it is not always possible to avoid outliers and interferences in the estimation of the camera’s movement. This type of object introduces characteristic points whose movement does not align with the actual movement performed by the camera. To filter these objects, this work presents a neural network architecture that combines RGB images and optical flow to segment regions that exhibit moving objects, even while the camera itself moves. To enable the training of the network, a methodology for quick annotation of object detection datasets is presented to add semantic masks of moving objects to 98,491 images of an urban navigation dataset. The proposed neural network was trained and evaluated with these data and proved adequate for use as a dynamic object filter in visual odometry tasks. To evaluate the proposed model, comparisons of visual odometry algorithms with and without the use of filtering are presented. Based on the results obtained in this work, the identification and filtering of dynamic objects in an image emerges as a fundamental step in the task of visual odometry, being essential for applications involving the presence of dynamic objects.
Mineração de argumentos em documentos jurídicos em Português
(Universidade Federal de Goiás, 2024-12-02) Evangelista, Euripedes Balsanulfo; Silva, Nádia Félix Felipe da; http://lattes.cnpq.br/7864834001694765; Silva, Nádia Félix Felipe da; Pereira, Fabíola Souza Fernande; Cordeiro, Douglas Farias
This work presents an argument mining approach applied to Brazilian labor court documents. Although the mining of arguments in legal documents has been a subject of study for over a decade, only one work has been found that specifically applies this study to Brazilian Portuguese in the legal domain. In this dissertation, we thoroughly explore all the necessary steps to achieve the objective of the argument mining task. Thus, our approach consists of use a Transformers-based Language Model trained on a specific domain corpus of Brazilian labor justice and we report an F1-score of 88.86% on the classification task. The proposal outperformed BERTimbau by 1.88% and Deberta by 3.39%.
Detecção de traços de depressão em textos na língua portuguesa considerando aspectos culturais e regionais do Brasil com o uso de LLMs
(Universidade Federal de Goiás, 2024-11-25) Rodrigues, Leidiane Beatriz Passos; Lago, Marilúcia Pereira do; http://lattes.cnpq.br/4323131996569717; Fernandes, Deborah Silva Alves; http://lattes.cnpq.br/0380764911708235; Fernandes, Deborah Silva Alves; Lago, Marilucia Pereira do; Silva, Nádia Félix Felipe da; Pires, Sandrerley Ramos
Embargada
Otimização de Desempenho de Análise Federada para Redes de Próxima Geração (B5G/6G)
(Universidade Federal de Goiás, 2025-02-20) Sebastião, Xavier Paulino; Ribeiro, Maria Do Rosario Campos; Oliveira Júnior, Antonio Carlos de; http://lattes.cnpq.br/3148813459575445; Oliveira Júnior, Antonio Carlos de; Moreira, Waldir; Ribeiro, Maria Do Rosario Campos; Lopes, Victor Hugo Lazaro
The rapid growth of interconnected devices across various sectors in the world has led to the generation of large volumes of data. Depending on its nature and specific needs, a significant part of this data is handled and analyzed using data science techniques to support decision-making. Alongside these advancements, as institutions rely more on data-driven systems, they also face increasing threats and security challenges that compromise the privacy of their clients or collaborators, consequently damaging their reputation. Federated Analytics (FA) is an innovative approach for preserving data security and privacy by implementing collaborative analysis of data from distributed devices without sharing raw data. However, in cases where FA operates over wireless transmission, challenges such as interference, signal degradation, and network congestion may arise. These factors can make the wireless transmission unreliable, introducing delays and causing corruption in responses and updates received at the central server, thereby compromising the quality of the final aggregated FA results. This work proposes an integrated framework for simulating FA in real 5G network conditions. The framework applies two algorithms: channel-aware power allocation algorithm to efficiently allocate transmission power for user equipments (UEs) based on distance and channel conditions, and synchronous FA5GLENA integrated algorithm to integrate the FA with NS-3 5G-LENA and aggregate results for optimized performance within 5G network conditions. To evaluate the impact of the network on FA, three scenarios were compared: (1) uniform maximum power allocation for all UEs, (2) random power allocation, and (3) channel-aware power allocation algorithm. The simulation results show that the channel-aware algorithm outperforms the uniform and random power allocation scenarios on both the network and FA operation. On FA, the algorithm achieved statistically higher accuracy (93.17 %), precision (93.31 %), and recall (93.09 %) compared to uniform allocation (accuracy: 55.96 %, precision: 56.02 %, recall: 55.90 %) and random allocation (accuracy: 42 %, precision: 42.02 %, recall: 41.96 %), highlighting the superiority of the algorithm in enhancing FA performance.
Modelo de linguagem para o mercado de ações Brasileiro: Uma abordagem baseada em análise de sentimentos usando o modelo BERTimbau
(Universidade Federal de Goiás, 2024-10-03) Araujo, Leandro dos Santos; Fernandes, Deborah Silva Alves; http://lattes.cnpq.br/0380764911708235; Fernandes, Deborah Silva Alves; Santos, Adam Dreyton Ferreira dos; Soares, Fabrízzio Alphonsus Alves de Melo Nunes
Embargada.
Reconhecimento de entidades nomeadas em editais de licitação
(Universidade Federal de Goiás, 2024-11-29) Souza Filho, Ricardo Pereira de; Silva, Nádia Félix Felipe da; http://lattes.cnpq.br/7864834001694765; Silva, Nádia Félix Felipe da; Fernandes, Deborah Silva Alves; Souza, Ellen Polliana Ramos
This work explores the use of large language models (LLMs) for information extraction in public procurement notices, focusing on the Named Entity Recognition (NER) task. Given the diverse and unstandardized nature of these documents, the study proposes a methodology that integrates semantic selection techniques with Zero-Shot and Few-Shot scenarios, aiming to optimize the annotation and entity extraction process, reduce manual intervention, and improve accuracy. The first step involved building an annotated corpus containing named entities from pro-curement notices. Subsequently, the BERTimbau, BERTikal, and mDeBERTa models were trained in a supervised manner using this annotated dataset. Experiments showed that BERTimbau achieved the best overall performance, with an F1-score above 0.80. In the Zero-Shot and Few-Shot scenarios, various prompt templates and example selection strategies were tested. Models such as GPT-4 and LLaMA achieved performance compa-rable to supervised models when aided by semantically relevant examples, despite modest results in the absence of examples. The results indicate that combining enriched prompts with examples and the pre-selection of relevant sentences during the annotation phase contributes to greater accuracy and efficiency in the NER process for procurement notices. The proposed methodology can be applied to information extraction, with potential impacts on transparency and auditing in public procurement.
Avaliação de grandes modelos de linguagem na simplificação de texto de decisões jurídicas utilizando pontuações de legibilidade como alvo
(Universidade Federal de Goiás, 2024-11-29) Paula, Antônio Flávio Castro Torres de; Camilo Junior, Celso Gonçalves; http://lattes.cnpq.br/6776569904919279; Camilo Júnior, Celso Gonçalves; Oliveira, Sávio Salvarino Teles de; Naves, Eduardo Lázaro Martins
The complexity of language used in legal documents, such as technical terms and legal jargon, hinders access to and understanding of the Brazilian justice system for laypeo ple. This work presents text simplification approaches and assesses the state-of-the-art by considering large language models with readability scoring as a parameter for simplification. Due to limited resources for text simplification in Portuguese, especially within the legal domain, the application of a methodology based on text modification using readability scoring enables experiments that leverage the knowledge acquired during the training of these large language models, while also allowing for automatic evaluation without the need for labeled data. This study evaluates the simplification capabilities of large language models by using eleven models as case studies. Additionally, a real corpus was developed, based on legal rulings from the Brazilian justice system.
Avaliação de Grandes Modelos de Linguagem para Raciocínio em Direito Tributário
(Universidade Federal de Goiás, 2024-11-22) Presa, João Paulo Cavalcante; Oliveira, Sávio Salvarino Teles de; http://lattes.cnpq.br/1905829499839846; Camilo Junior, Celso Gonçalves; http://lattes.cnpq.br/6776569904919279; Camilo Júnior, Celso Gonçalves; Oliveira, Sávio Salvarino Teles de; Silva , Nádia Felix Felipe da; Leite, Karla Tereza Figueiredo
Tax law is essential for regulating relationships between the State and taxpayers, being crucial for tax collection and maintaining public functions. The complexity and constant evolution of tax laws make their interpretation an ongoing challenge for legal professionals. Although Natural Language Processing (NLP) has become a promising technology in the legal field, its application in brazilian tax law, especially for legal entities, remains a relatively unexplored area. This work evaluates the use of Large Language Models (LLMs) in Brazilian tax law covering federal tax aspects, analyzing their ability to process questions and generate answers in Portuguese for legal entities’ queries. For this purpose, we built an original dataset composed of real questions and answers provided by experts, allowing us to evaluate the ability of both proprietary and open-source LLMs to generate legally valid answers. The research uses quantitative and qualitative metrics to measure the accuracy and relevance of generated answers, capturing aspects of legal reasoning and semantic coherence. As contributions, this work presents a dataset specific to the tax law domain, a detailed evaluation of different LLMs’ performance in legal reasoning tasks, and an evaluation approach that combines quantitative and qualitative metrics, thus advancing the application of artificial intelligence in the analysis of tax laws and regulations.
Integração de uma aplicação de realidade aumentada com sistemas 5G seguindo o padrão 3GPP
(Universidade Federal de Goiás, 2024-12-04) Cardoso, Pabllo Borges; Cardoso, Kleber Vieira; http://lattes.cnpq.br/0268732896111424; Corrêa, Sand Luz; http://lattes.cnpq.br/3386409577930822; Cardoso, Kleber Vieira; Freitas , Leandro Alexandre; Oliveira Junior, Antonio Carlos de
Based on the standards defined by the 3rd Generation Partnership Project (3GPP), this work validates the 5G Media Streaming (5GMS) model, using the MR-Leo prototype as a case study. MR-Leo is a Mixed Reality (MR) application designed to explore the potential of these technologies in high-demand computational environments. The study begins with a review of advancements enabled by 5G networks, emphasizing their ability to provide low-latency connectivity, high bandwidth, and support for heterogeneous devices at scale. Additionally, the frameworks CAPIF and SEAL are discussed as tools to facilitate interoperability and API management in the 5G architecture, though recognized for their technical complexity and limited practical adoption. Edge computing is then investigated as a strategic component capable of bringing computational resources closer to end users, reducing latencies and enhancing the performance of intensive algorithms critical for MR applications. The validation of the proposed study was carried out in three distinct scenarios: a local controlled environment, an emulated 5G network, and a real 5G callbox. Experimental evaluation demonstrated the superiority of the protocol combined with video compression, achieving consistent metrics that meet the key performance indicators (KPIs) defined in the literature. The comparative qualitative analysis highlighted significant compatibilities as well as gaps, such as the absence of a functional component equivalent to the 5GMS Application Function (AF). In this regard, this work makes important contributions by demonstrating the technical feasibility of delivering MR services on 5G networks through edge computing.
Arquitetura holística de redes 6G: integração das camadas de comunicação espacial, aérea, terrestre, marinha e submarina com gêmeos digitais e inteligência artificial
(Universidade Federal de Goiás, 2024-11-22) Araújo, Antonia Vanessa Dias; Oliveira Júnior, Antonio Carlos de; http://lattes.cnpq.br/3148813459575445; Oliveira Júnior, Antonio Carlos de; Moreira, Rodrigo; Freitas, Leandro Alexandre
This dissertation proposes a holistic architecture for 6G networks, aiming at the integration of space, aerial, terrestrial, maritime, and submarine communication networks, targeting global and continuous connectivity. The integration of these networks, especially non-terrestrial networks (NTN), with terrestrial infrastructure presents significant technical and architectural challenges. The study focuses on modeling a unified architecture that fosters interaction between these network layers, with an emphasis on extreme and ubiquitous coverage. The methodology involves a detailed analysis of technological challenges and key enablers, such as digital twins, artificial intelligence (AI), and network orchestration, which facilitate the integration and efficient operation of 6G networks. The proposal is evaluated through simulations, highlighting the synergy between the different network components and their ability to provide ubiquitous and transparent communication to the user. It concludes that the proposed architecture provides a promising foundation for the implementation of innovative use cases, such as emergency communications, environmental monitoring, telemedicine, and smart agriculture, emphasizing the importance of extreme global coverage as one of the architectural cornerstones.

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