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Segmentation and Classification of Individual Clouds in Images Captured with Horizon-Aimed Cameras for Nowcasting of Solar Irradiance Absorption

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American Journal of Climate Change 2023年第4期12卷 628-654页

作者： Bruno Juncklaus Martins Juliana Marian Arrais Allan Cerentini Aldo von Wangenheim gilberto perello ricci neto Sylvio Mantelli PPGCC-INE UFSC Federal University of Santa Catarina Florianopolis Brazil FOTOVOLTAICA INPE Brazilian National Institute for Space Research Sao Paulo Brazil

One important aspect of solar energy generation especially in inter-tropical sites is the local variability of clouds. Satellite images do not have temporal resolution enough to nowcast its impacts on solar plants, this monitoring is made by local cameras. However, cloud detection and monitoring are not trivial due to cloud shape dynamics, the camera is a linear and self-adjusting device, with fish-eye lenses generating a flat image that distorts images near the horizon. The present work focuses on cloud identification to predict its effects on solar plants that are distinct for every site’s climatology and geography. We used RASPBERY-PI-based cameras pointed at the horizon to allow observation of clouds’ vertical distribution, not possible with a unique fish-eye lens. A large number of cloud image identification analyses led the researchers to use deep learning methods such as U-net, HRnet, and Detectron. We use transfer learning with weights trained over the “2012 ILSVRC ImageNet” data set and architecture configurations like Resnet, Efficient, and Detectron2. While cloud identification proved a difficult task, we achieved the best results by using Jaccard Coefficient as a validation metric, with the best model being a U-net with Resnet18 using 486 × 648 resolution. This model had an average IoU of 0.6, indicating a satisfactory performance in cloud segmentation. We also observed that the data imbalance affected the overall performance of all models, with the tree class creating a favorable bias. The HRNet model, which works with different resolutions, showed promising results with a more refined segmentation at the pixel level, but it was not necessary to detect the most predominant clouds in the sky. We are currently working on balancing the dataset and mapping out data augmentation transformations for our next experiments. Our ultimate goal is to use such models to predict cloud motion and forecast the impact it will have on solar power generation. The present

关键词： Segmentation Cloud Nowcasting

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Comparative Study of the Complications of Pedicular Screw Fixation Techniques in the Thoracolumbar Spine: A Systematic Review

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Open Journal of Orthopedics 2023年第8期13卷 343-353页

作者： Vanessa Cavazana Takata João Vitor Lois Balestrieri Pedro Bastos neto Rodrigo Eduardo Souza Garcia Idiberto José Zotarelli Filho Luis Fernando ricci Boer Fabiano Morais Nogueira FAMERP-Faculty of Medicine of Sã o José do Rio Preto Orthopedics and Traumatology at Hospital de Base S&atildeo José do Rio Preto S&atildeo Paulo Brazil ABRAN-Brazilian Association of Nutrology Catanduva Sao Paulo Brazil Clinical Research and Biostatistical Department College of Palliative Medicine of Sri Lanka Colombo Sri Lanka

Introduction: The use of pedicle screws increases postoperative stability and consolidation of arthrodesis. Pedicle arthrodesis is currently the standard treatment for the thoracolumbar spine, presenting the best fusion and stiffness rates, and among its main indications is the possibility of better correction of spine deformities in the thoracic and lumbar region. However, due to different definitions and the lack of a control group, many of these studies have limited comparative analysis, resulting in the scarcity of comparative studies with standardized methodology. Objective: It was to analyze, through a systematic review, the safety and efficacy of instrumentation with pedicle screws in the spine which have been questioned, despite its wide use for stabilization of the spine, comparing the complications present in the insertion techniques of pedicle screws. Methods: The rules of the Systematic Review-PRISMA were followed. The literary search process was carried out from January to March 2023. A bibliographic search was carried out in MEDLINE, PubMed, and Scielo for articles produced between 2001 and 2023. The quality of the studies was based on the GRADE instrument, and the risk of bias was analyzed according to the Cochrane instrument. The Cohen test (Funnel Plot) and The Heterogeneity Test (Chi-Square Test – X2) were performed, with p Results and Conclusion: A total of 134 articles were found. A total of 67 articles were evaluated in full and 12 were selected to compose the results of this systematic review. According to the GRADE instrument, most studies (X2 = 90.2% > 50%) followed a controlled clinical study model and had a good methodological design, with p < 0.05. It was shown that poor positioning of pedicle screws is the most common cause of complications. The surgeon’s skills and the length and diameter of the pedicle screw can also affect the different modes of placement. Robotic computer assistance has the potential to reduce th

关键词： Pedicular Arthrodesis Complications Spinal Instrumentation

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