Repositório UFSCar

O Repositório Institucional da UFSCar (RI UFSCar) é um sistema de informação que visa armazenar, preservar, organizar e disseminar amplamente a produção intelectual dos diversos setores e segmentos da comunidade da UFSCar, provendo o acesso aberto à informação produzida na instituição e registrada como científica, tecnológica, didática, artístico-cultural e técnico-administrativa.

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Entre o brincar e o cuidar: desafios e possibilidades na vivência de uma irmã de criança autista
(Universidade Federal de São Carlos, 2026-08-14) Boldrin, Brenda Junqueira; Fernandes, Amanda Dourado Souza Akahosi Fernandes; http://lattes.cnpq.br/7901666626822625; http://lattes.cnpq.br/0656337623535224
Autism Spectrum Disorder (ASD) extends its impact beyond the diagnosed individual, influencing family dynamics and daily life. While studies often focus on the experiences of parents and caregivers, the lived experiences of the siblings of autistic children receive relatively little attention in literature and care practices. In this context, this study aimed to report the experience of an extension worker supporting an adolescent girl—the sister of a child with ASD—focusing on her experiences regarding her role as a sister and the resulting effects on her daily life. This is a qualitative, descriptive account of an experience developed within the scope of an extension project dedicated to supporting families of autistic children. Data were gathered through home visits, which included active listening, unstructured interactions, and activities utilizing expressive and play-based resources. Analysis of the records led to the identification of three thematic axes: understanding autism and the experience of having an autistic sister; daily life and family relationships; and the impacts and strengths regarding daily challenges. The results demonstrated that living with an autistic sister significantly influences routine organization, roles assumed within the family, and opportunities for leisure and social interaction. It was observed that the adolescent took on responsibilities related to her sister's care and family support, while simultaneously developing empathy, sensitivity to differences, and mediation skills. Challenges were also identified regarding increased responsibilities and a sense of invisibility amidst the central focus placed on her sister's needs. It is concluded that the experience of being the sister of an autistic child is marked by the coexistence of challenges and possibilities, reinforcing the importance of recognizing these individuals as active participants in family dynamics and as a group that also requires spaces for listening, support, and care. The findings contribute to broadening discussions on the role of Occupational Therapy with the families of autistic children, highlighting the need for interventions that encompass all family members.
A path toward 5G NR PHY acceleration: the LDPC offloading on BlueField-3 DPU
(Universidade Federal de São Carlos, 2026-08-03) Brusse, Vlademir; Verdi, Fábio Luciano; http://lattes.cnpq.br/9143186843657940; https://orcid.org/0000-0002-5455-8910; http://lattes.cnpq.br/1620745795070108; Madeira, Edmundo Roberto Mauro; Martinello, Magnos; http://lattes.cnpq.br/1870389730408675; http://lattes.cnpq.br/7471111924336519; https://orcid.org/0000-0002-1180-2637
The transition toward AI-native Radio Access Network (RAN) architectures further intensifies the demand for cloud infrastructure resources, as distributed intelligence, machine learning inference, and real-time data analytics become integral components of future RAN deployments. Containerized and virtualized network functions in Cloud RAN environments increasingly rely on hardware acceleration and workload offloading to meet the stringent latency, throughput and energy efficiency requirements of Fifth Generation (5G) Advanced and emerging Sixth Generation (6G) mobile networks. Within the 5G New Radio (NR) Physical Layer (PHY), Low-Density Parity-Check (LDPC) decoding represents a computationally intensive workload that depletes host CPU resources. While offloading to Data Processing Unit (DPU) offers general purpose core relief, it introduces systemic latency overheads. This research project evaluates an acceleration framework that offloads the 5G NR LDPC encoding and decoding pipeline from an OpenAirInterface (OAI) x86 host to an ARM-based NVIDIA BlueField-3 DPU utilizing the Arm RAN Acceleration Library (ArmRAL) over a Communication Channel. Hardware acceleration provides several benefits for 5G NR. Specialized accelerators such as Graphics Processor Unit (GPU), Field-Programmable Gate Array (FPGA), and DPU execute computationally intensive PHY functions in parallel, significantly increasing throughput while reducing processing latency to meet the stringent timing requirements of 5G. They also improve energy efficiency by delivering higher performance per watt than general-purpose CPUs. In addition, offloading functions such as LDPC decoding, Fast Fourier Transform (FFT), and beamforming relieves the host CPU, allowing it to focus on higher-layer protocol processing, scheduling, and network management. These advantages improve system scalability and make hardware acceleration a key enabler of cloud-native Open RAN deployments. In this work the ArmRAL LDPC kernels on the BlueField-3 ARM Cortex-A78AE cores are functionally correct, producing output bit-identical to the OAI software baseline as verified through Block Error Rate (BLER)–Signal-to-Noise Ratio (SNR) characterization under Additive White Gaussian Noise (AWGN) and Tapped Delay Line A (TDL-A30) fading channels, and execute competitively with the x86 software baseline. However, the host-visible per-CB Communication Channel (Comch) latency exceeds the slot budget by two orders of magnitude, producing a substantial Flow Completion Time (FCT) slowdown and energy efficiency degradation relative to the OAI software baseline across end-to-end experiments. Our results show that the bottleneck is the per-CB Comch framework overhead between the host and the DPU, rather than ARM compute capability or Peripheral Component Interconnect Express (PCIe) payload transfer, identifying host-visible Comch latency as the dominant architectural barrier to transparent lookaside PHY acceleration and quantifying its impact on FCT, throughput, and gross energy consumption relative to the OAI software baseline. Future work directions include persistent Comch contexts, Data Center Infrastructure-on-a-Chip Architecture (DOCA) Direct Memory Access (DMA)-based data paths, and slot-level OAI interfaces approaching an inline acceleration model.
Research Data for the Article “Towards Social Affordances for Mental Health Chatbots: Perspectives from University Students”
(Universidade Federal de São Carlos, 2026-09-04) Silva, Grasiane Cristina da; Souza, Paula Maia de; Neris, Vânia Paula de Almeida; https://lattes.cnpq.br/0903980771347574; http://lattes.cnpq.br/0268728255033469; http://lattes.cnpq.br/1069588937187655; https://orcid.org/0000-0002-9698-2314; https://orcid.org/0000-0002-5221-8859; https://orcid.org/0000-0002-4059-8700
Comportamento de corrosão eletroquímica de ligas inoxidáveis com efeito de memória de forma Fe-Mn-Si-Cr-Ni-(Co) em soluções simuladas de poro de concreto
(Universidade Federal de São Carlos, 2026-09-14) Aviles, David José Barreto; Silva, Rodrigo; http://lattes.cnpq.br/3763016865133213; https://orcid.org/0000-0002-1381-1334; Rovere, Carlos Alberto Della; http://lattes.cnpq.br/8141224513975606; https://orcid.org/0000-0003-1534-0561; https://lattes.cnpq.br/6135884254948694; https://orcid.org/0000-0002-0946-0033; Magalhães, Danielle Cristina Camilo; Mendes Filho, Anibal de Andrade; http://lattes.cnpq.br/5486724956564584; http://lattes.cnpq.br/4033093647135538; https://orcid.org/0000-0001-5857-4902; https://orcid.org/0000-0002-6230-8196
Fe-Mn-Si-Cr-Ni-(Co) shape memory stainless steel (SMSS) are being studied for structural applications due to their combination of lower cost and properties such as strain recovery, prestressing force generation, and energy dissipation during seismic events. However, their performance in cementitious environments subject to carbonation and chloride contamination - particularly in coastal regions - remains insufficiently understood. This study characterized the microstructure and electrochemical behavior of three SMSSs (A, B, and C) in synthetic concrete pore solutions - pH 13.8 (freshly cured) and pH 8.5 (carbonated), both without and with 0.1 M NaCl - comparing them to SAE 1020 and SAE 304 steels. Techniques employed included OM, SEM/EDS, XRD, potentiodynamic and cyclic polarization, EIS, and XPS. At pH 13.8, all materials exhibited stable passivity with low current densities. Upon reducing the pH to 8.5, the three SMSSs and SAE 304 remained passive, whereas SAE 1020 exhibited active behavior and an icorr approximately 30 times higher; furthermore, it generated a potential difference of ≈ 400 mV , indicating a severe risk of galvanic corrosion. With the addition of chlorides at pH 8.5, SMSSs A and B underwent localized corrosion, with breakdown potentials (Eb) of +677 and +930 mVAg/AgCl, respectively; conversely, SMSS C and AISI 304 remained in a passive state (Eb +1050 mVAg/AgCl). SAE 1020 was the most affected, with its Eb dropping from +1080 to +140 mVAg/AgCl. XPS analysis revealed passive films enriched in Si and Cr and depleted in Fe and Mn on the SMSSs, ensuring protection even in a carbonated environment. It is concluded that SMSS C is the most promising for use in reinforced concrete in saline environments; however, avoiding galvanic contact with carbon steel in carbonated concrete is recommended to ensure durability.
Estudo computacional da estabilidade termodinâmica de complexos de nanopartículas quirais e proteínas
(Universidade Federal de São Carlos, 2026-09-22) Bolli, Julia; Moura, André Farias de; http://lattes.cnpq.br/0746428641961163; http://lattes.cnpq.br/9285996540081055; https://orcid.org/0000-0003-4041-6433; Freire, Caio César de Melo; Muniz, Sérgio Ricardo; http://lattes.cnpq.br/6594298373448536; http://lattes.cnpq.br/7928079502382507
Molecular recognition at the interface between nanoparticles (NPs) and biomolecules depends on the structural and stereochemical organization of the interacting surfaces. However, the molecular mechanisms by which surface chirality modulates protein interactions remain only partially understood. This study investigated the influence of the chirality of trimanganese tetroxide nanoparticles functionalized with mannonic acid (Mn3O4-man) on their interaction with human serum albumin (HSA). Molecular dynamics simulations were performed to investigate systems containing apo-HSA and NPs with L- and D-chiral configurations. The trajectories were analyzed in terms of interaction energies, hydrogen bonds, intermolecular contacts, and structural and conformational parameters of the protein. The results showed that the interaction with HSA strongly depends on the chiral configuration of the nanoparticle surface, as only the L-NPs were able to establish stable and energetically favorable interactions with the protein. The D-NPs exhibited only transient contacts and interaction energy profiles close to zero, without the formation of persistent bound states. Spatial analysis of the interactions revealed that chiral recognition occurred locally, with Domain III of HSA, particularly the region corresponding to the Sudlow II site, being the only region capable of sustaining a stable interface with the L-NPs, mainly involving residues Lys538, Ala539, Lys541, and Glu542. The interaction energies and contact maps suggest that interface stabilization depends on the formation of a cooperative network of spatially complementary interactions, consistent with the concept of an interfacial “chiral footprint.” Conformational analyses indicated that persistent interaction with the L-NP induces localized dynamic changes, particularly in Domain III, without compromising the overall structural stability of HSA. The RMSD, RMSF, and radius of gyration results are consistent with a two-step recognition mechanism involving initial recognition driven by stereochemical compatibility between the surfaces, followed by local conformational adaptations consistent with an induced-fit mechanism. Overall, the results demonstrate that surface chirality acts as a selective structural factor in biomolecular recognition, influencing the affinity, temporal persistence, and spatial organization of protein-nanoparticle interactions. These findings contribute to the mechanistic understanding of nano-biomolecular interactions and provide a basis for the rational design of nanomaterials with enhanced biomolecular selectivity.