https://ri.ufs.br/jspui/handle/riufs/2150 Tue, 18 Aug 2026 18:56:09 GMT 2026-08-18T18:56:09Z https://ri.ufs.br/jspui/handle/riufs/25815 Título: Investigação de métodos para estimação de pesos de relevância para agrupamento de dados relacionais com múltiplas visões Autor(es): Silva, Vitória Teles da Abstract: Multiview data clustering is characterized as the challenge of grouping similar data and separating dissimilar data by using different representations, such as attribute vectors, feature matrices, graphs, or images, whichtogetherprovidecomplementaryinformation.Thisapproachisappliedin real-world scenarios such as social network analysis, medical image classification, recommender systems, and multimedia data integration. Data clustering is one of the most relevant tools for data analysis, and its importance is related to the faithful representation of real-world data, with the combined use of multiple views providing greater accuracy when compared to the use of a single view. The experiments show that the performance of multiview clustering algorithms strongly depends on the distance metrics and weight estimation strategies. While MRDCA-RWL is more sensitive to the adopted distance metric, methods such as MVKKM and MVSC exhibit a strong joint dependence on both distance metrics and weights, reinforcing the importance of selecting appropriate parameters. Given the above, this work addresses the need for a proper interpretation of the use of multiview data in the context of contemporary applications, aiming to investigate different methods for estimating relevance weights. These weights are then applied to the different views in the context of relational data clustering, discussing both the quality of the results and the algorithmic efficiency in comparison with the complexity of competing solutions. Based on this, the experimental results demonstrate the influence of the methodological choices on the behavior of the algorithms, with MRDCA-RWL exhibiting more stable behavior, whereas MVKKM,MVSC,andTW-KMdemonstrate sensitivity to configuration changes. Thu, 23 Jul 2026 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/25815 2026-07-23T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/25810 Título: A comparative survey of ARM and RISC-V: architectures, applications and challenges Autor(es): Meira, Andre Reges Souza Abstract: The selection of a processor instruction set architecture (ISA) has become a foundational engineering decision that shapes the performance, power efficiency, security, and supply-chain independence of modern computing systems. Three converging trends make a renewed comparison of ARM and RISC-V especially timely: the expansion of computing into safety- and securitycritical domains governed by standards such as ISO 26262 and IEC 61508; the rise of RISC-V as the first credible open alternative to ARM, with over ten billion cores shipped by 2024; and the growing demand for hardware auditability following microarchitectural attacks such as Spectre and Meltdown and supply-chain compromises such as the XZ Utils backdoor. In this master’s thesis, we provide a comprehensive, parallel-structured comparative survey of the ARM and RISC-V architectures, spanning ISA design and evolution, microarchitecture, vector processing, and virtualization, together with the application domains of robotics, artificial intelligence, and hardware security — dimensions that existing ISA-level, benchmarking, and industry analyses address only in isolation. The work is an architectural survey rather than an experimental benchmarking study, grounded in ISA specifications, peer-reviewed literature from IEEE, ACM, USENIX, and Springer venues, vendor datasheets and safety documentation, and international functional-safety standards, and organised as a chapter-by-chapter parallel evaluation of the two architectures. The analysis finds that the gap between ARM and RISC-V is increasingly one of ecosystem maturity rather than architectural capability: ARM offers a vertically integrated, broadly deployed ecosystem with hardware-enforced security defaults (PAC, MTE, BTI, CCA) and certified safety cores, whereas RISC-V offers openness, amenability to formal verification, and license-free customisation, with ISO 26262 ASIL D cores now emerging. For artificial-intelligence workloads, RISC-V demonstrates up to fourfold superior energy efficiency through custom extensions, while ARM delivers up to fifteenfold faster inference on complex networks through a mature toolchain; these figures are best-case, implementation-dependent trends rather than fixed architectural verdicts. Across robotics and security, architecture selection proves application- and certificationdependent rather than absolute, and the frontier is shifting from a binary ARM-versus-RISC-V choice toward heterogeneous designs that compose both architectures with domain-specific accelerators on a single platform. Wed, 22 Jul 2026 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/25810 2026-07-22T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/25792 Título: Diagnóstico da mobilidade urbana sustentável em capitais regionais: um estudo de caso em Feira de Santana/BA Autor(es): Santos, Eduardo Xavier Abstract: This dissertation is situated within the field of sustainable urban mobility, understood as a planning model that incorporates into urban mobility an agenda guided by measures aimed at promoting quality of life, preserving the environment, and protecting natural resources (Carvalho, 2016). Thus, the objective of this research is to analyze sustainable urban mobility in a Brazilian regional capital, taking the municipality of Feira de Santana (BA) as a case study. According to IBGE (2018), based on the REGIC study, 97 municipalities are classified as regional capitals, characterized as urban centers with a high concentration of management activities and services that exert influence over extensive regional areas. Among these cities, Feira de Santana, Bahia, is selected as the case study because it represents the second largest municipality in the state, with more than 600,000 inhabitants (IBGE, 2022). Furthermore, it constitutes the main economic, commercial, and logistical hub of Bahia’s interior, performing typical functions of a structured regional capital by concentrating demographic and economic flows from its area of influence (Santos et al., 2024). As a methodological instrument, the Sustainable Urban Mobility Index (IMUS), developed by Costa (2008), is adopted, as it is a methodology widely applied in the Brazilian context and has been implemented in six regional capitals over the past five years: João Pessoa (PB), Aracaju (SE), Ribeirão Preto (SP), Passo Fundo (RS), Rio Verde (GO), and Sinop (MT). The IMUS is based on a quantitative and multicriteria approach structured around 87 indicators distributed across nine thematic domains: accessibility; environmental aspects; social aspects; political aspects; transport infrastructure; non-motorized modes; integrated planning; traffic and urban circulation; and urban transport systems. The research draws on data from institutional databases, legislation, urban plans, and field surveys to meet the requirements of the indicators, which are calculated and organized according to a weighting system that allows for the redistribution of values in cases where the application of a given indicator is not feasible. Due to limitations in data availability, 55 indicators were applied in Feira de Santana, corresponding to a completion rate of 63%. Nevertheless, the study remains valid, as indicators were computed across all nine domains, as required by Costa (2008). As a result, Feira de Santana achieved an overall index score of 0.432, highlighting as a strength the presence of regulatory instruments aligned with federal policies. On the other hand, the main weaknesses include the predominance of fragmented actions, low intersectoral coordination, limited intermodality, low quality of urban public transport services, shortcomings in democratic governance, socio-spatial inequalities, and institutional limitations in urban mobility management. These findings indicate a mismatch between the normative framework and the effective implementation of the guidelines established by the National Urban Mobility Policy. A similar pattern is observed among the other regional capitals analyzed, suggesting common characteristics among these municipalities. Based on these findings, five general guidelines are proposed to support future actions and planning initiatives: strengthening the integration between urban planning and mobility; reorienting road space to prioritize sustainable modes; improving and strengthening urban public transport; reinforcing the environmental dimension of urban mobility; and expanding democratic governance and social control mechanisms. Finally, it is concluded that the application of the IMUS proves to be appropriate for diagnosing sustainable urban mobility in Feira de Santana and for guiding improvements in sustainable urban mobility in regional capitals. Thu, 26 Mar 2026 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/25792 2026-03-26T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/25791 Título: Análise numérica do colapso progressivo de estruturas de concreto armado com base na mecânica do dano concentrado Autor(es): Santos Junior, Gilberto Messias dos Fri, 24 Jul 2026 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/25791 2026-07-24T00:00:00Z