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Adriana Cuenca,Aura Coy,Natalia Gutiérrez,María Paula Santos,Juan David Bustos,Ana María Morales,Alejandra Marín 대한소아응급의학회 2023 대한소아응급의학회지 Vol.10 No.1
Purpose: During the coronavirus disease 2019 pandemic, Colombian government declared a lockdown, forcing children to stay at home. The authors aimed to analyze the change in the pattern of trauma-related visits during the lockdown. Methods: We carried out a retrospective descriptive study on injured children aged 17 years or younger who visited the emergency department of a tertiary pediatric hospital in Bogotá, Colombia from March 15 through May 15, 2019 (control period) and the same period in 2020 (lockdown period). Between the 2 periods, baseline characteristics and injury profiles were compared. Results: Among the study population (n = 1,485), 1,122 and 363 children visited the emergency department during the control and lockdown periods, respectively. In the midst of 73.9% decrease in numbers of overall visits between the 2 periods, a 67.6% decrease was noted in number of trauma-related visits. Regarding the proportions, trauma-related visits increased from 7.9% to 9.8%. During the lockdown, increases occurred in the proportions of the following variables: children younger than 5 years (25.5% to 50.7%; P < 0.001), mechanisms other than blunt, minor fall or traffic accident (e.g., bite, 3.9% to 6.6%; P = 0.032), child abuse (1.2% to 4.1%; P = 0.003), hospitalization (4.6% to 35.8%; P < 0.001), open wound (21.1% to 36.9%; P < 0.001), the use of computed tomography (6.3% to 9.9%; P < 0.001), and abnormal imaging findings (28.8% to 31.7%; P = 0.003). Conclusion: During the lockdown, children with trauma may show an increase in overall severity, and also a higher risk of abusive trauma. This finding indicates a sensible need of educating families in prevention of domestic injury.
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CONVERGENCE OF THE RELAXED NEWTON’S METHOD
Ioannis Konstantinos Argyros,José Manuel Gutiérrez,Ángel Alberto Magreñán,Natalia Romero 대한수학회 2014 대한수학회지 Vol.51 No.1
In this work we study the local and semilocal convergence of the relaxed Newton’s method, that is Newton’s method with a relaxation parameter 0 < λ < 2. We give a Kantorovich-like theorem that can be applied for operators defined between two Banach spaces. In fact, we obtain the recurrent sequence that majorizes the one given by the method and we characterize its convergence by a result that involves the relaxation parameter λ. We use a new technique that allows us on the one hand to generalize and on the other hand to extend the applicability of the result given initially by Kantorovich for λ = 1.
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