Coleção de Artigos Acadêmicos
URI permanente para esta coleçãohttps://repositorio.insper.edu.br/handle/11224/3227
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2 resultados
Resultados da Pesquisa
Artigo Científico Biomechanical comparison of three locking plate constructs for stabilization of a femoral segmental defect model in cats(2026) Carbonari, Marcelo José; Coris, Jeniffer Gabriela Figueroa; Rahal, Sheila Canevese; Pereira, César Augusto M.; Cassanego, Guilherme Rech; Wei, Teng Hsiang; Caldeira, Fátima Maria C.This study biomechanically evaluated three titanium locking plate constructs for stabilizing a segmental defect model that simulated a comminuted femoral shaft fracture in cats. Four groups were formed: G1 – single locking plate; G2 – plate-rod construct; G3 – dual plate in an orthogonal configuration; and G4 – intact bone. G1 used 16-hole locking plate with bicortical screws placed in holes 1, 3, 7, 10, 14, and 16. In G2, an intramedullary pin was included, with monocortical screws in the same positions. In G3, screws were placed as in G1, except that monocortical screws were used in holes 7 and 10. Additionally, an 8-hole plate was applied in orthogonal configuration, with monocortical screws placed in holes 1, 3, 6, and 8. All constructs underwent cyclic eccentric axial compression, followed by destructive testing, except G4, which was tested only destructively. During cyclic testing, stiffness did not differ between G2 and G3, while G1 exhibited lower stiffness. Deformation measured with Gauge 1 (16-hole plate) was greatest in G1, with no significant difference between G2 and G3. Deformation measured with Gauge 2 (intramedullary pin and orthogonal plate) was greater in G2 than in G3. In destructive testing, stiffness did not differ between G1 and G2, or between G2 and G3. Maximum force and displacement did not differ among Groups 1, 2 and 3. Group 4 differ from other groups for these variables. In conclusion, both the locking plate–rod construct and the dual titanium locking plate demonstrated similar stiffness, but locking plate–rod configuration exhibited greater deformation.Artigo Científico Granger Causality among Graphs and Application to Functional Brain Connectivity in Autism Spectrum Disorder(2021) Ribeiro, Adèle Helena; MACIEL CALEBE VIDAL; Sato, João Ricardo; Fujita, AndréGraphs/networks have become a powerful analytical approach for data modeling. Besides, with the advances in sensor technology, dynamic time-evolving data have become more common. In this context, one point of interest is a better understanding of the information flow within and between networks. Thus, we aim to infer Granger causality (G-causality) between networks’ time series. In this case, the straightforward application of the well-established vector autoregressive model is not feasible. Consequently, we require a theoretical framework for modeling time-varying graphs. One possibility would be to consider a mathematical graph model with time-varying parameters (assumed to be random variables) that generates the network. Suppose we identify G-causality between the graph models’ parameters. In that case, we could use it to define a G-causality between graphs. Here, we show that even if the model is unknown, the spectral radius is a reasonable estimate of some random graph model parameters. We illustrate our proposal’s application to study the relationship between brain hemispheres of controls and children diagnosed with Autism Spectrum Disorder (ASD). We show that the G-causality intensity from the brain’s right to the left hemisphere is different between ASD and controls.