Percorrer por data de Publicação, começado por "2023-04-17"
A mostrar 1 - 2 de 2
Resultados por página
Opções de ordenação
- Shared Resource Contention Aware Schedulability Analysis for Multiprocessor Real-Time SystemsPublication . Arora, Jatin; Tovar, Eduardo; Maia, CláudioMulticore platforms share the hardware resources such as caches, interconnects, and main memory among all the cores. Due to such sharing, tasks running on different cores compete to access these shared resources which can potentially result in shared resource contention. This shared resource contention can increase the execution times of tasks in a non-deterministic manner. Consequently, the shared resource contention is problematic for hard real-time systems, i.e., systems that run tasks with stringent timing requirements. To address this issue, this PhD dissertation builds novel solutions to model and analyze the shared resource contention that can be suffered by tasks executing on a multicore system. The shared resource contention aware schedulability analysis is then derived by integrating the maximum shared resource contention that can be suffered by the tasks.
- Can collagen membrane on bone graft interfere with light transmission and influence tissue neoformation during photobiomodulation? A preliminary studyPublication . Varela, Paulo Jorge Romão; Barros, Piedade; Montagner, Pedro Giorgetti; Provout, Michelle B.; Martinez, Elizabeth F.; Suzuki, Selly Sayuri; Garcez, Aguinaldo Silva; Gonçalves de Barros, Piedade AuroraThis study qualitatively and quantitatively evaluated the transmission of light through a collagen membrane and the consequent local bone formation in a critical bone defect in vitro and in an animal model. Currently, bone substitutes and collagen membranes are used to promote new bone formation; however, when associated with photobiomodulation, biomaterials can act as a barrier, hindering the passage of light radiation to the area to be treated. Light transmittance was evaluated in vitro with a power meter and a 100 mW, 808 nm laser source with and without membrane. Twenty-four male rats received a critical surgical defect of 5 mm in diameter in the calvarial bone, subsequently a biomaterial (Bio-Oss; Geistlich®, Switzerland) was applied, and the animals were divided into the following three groups: G1—collagen membrane and no irradiation; G2—collagen membrane and photobiomodulation (irradiation with 4 J of 808 nm); and G3—photobiomodulation (4 J) followed by a collagen membrane. Histomophometric analyses were performed at 7 and 14 days after euthanasia. The membrane reduced the light transmittance (808 nm) by an average of 78%. Histomophometric analyses showed significant differences in new blood vessels on day 7 and bone neoformation on day 14. Irradiation without membrane interposition resulted in a 15% more neoformed bone compared with the control (G1), and 6.5% more bone compared with irradiation over the membrane (G2). The collagen membrane interferes with light penetration during photobiomodulation, decreases light dosimetry on the wound area, and interferes with bone neoformation.