Publications by authors named "A Ulgen"

This study aims to find out how the crystallinity quality, surface morphology, and mechanical performances change with the substitution of yttrium (Y) for bismuth (Bi) impurity within molar ratios of 0.00 ≤ x ≤ 0.12 in the BiYSrCaCuO (Bi-2212) cuprates to reveal the dependence of micro surface topology on the substitution mechanism and achieve a strong relation between the impurity ions and crystallization mechanism.

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Background: This article is aimed to make predictions in terms of prognostic factors and compare prediction methods by using Cox proportional hazards regression analysis (CPH), some machine learning techniques and Accelerated Failure Time (AFT) model for post-treatment survival probabilities according to clinical presentations and pathological information of early-stage breast cancer patients.

Material And Methods: The study was carried out in three stages. In the first stage, the CPH method was applied.

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Diabetes mellitus (DM) is common among older adults hospitalized with lower respiratory tract infection, yet information on the impact of DM on disease severity is limited. This study retrospectively analyzed 46 Turkish patients infected with respiratory syncytial virus (RSV), with information on their comorbidities, co-infection status, and symptoms. Patients are grouped into four severity levels from mild to severe, according to lung parenchymal infiltration status and oxygen level.

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Article Synopsis
  • - COVID-19 survival analysis involves two mutually exclusive outcomes—death and hospital release—leading to cause-specific hazard ratios (csHR) and an odds ratio (OR) from logistic regression, with a noted relationship where the magnitude of the OR is greater than or equal to that of csHR.
  • - The csHR values for death and release show opposite behaviors, meaning that if one increases, the other tends to decrease, highlighting the nature of these conflicting events in the survival outcome.
  • - There may be a reciprocal relationship between the two csHR values, indicating that factors influencing faster death might also slow down recovery processes, although the precise quantitative relation remains unclear, which could inform future research on COVID-19 and similar diseases.
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We have shown in an ethnically homogenous Turkey cohort with more than six thousand cases and 25 thousand controls that ABO blood types that contain anti-A antibody (O and B) are protective against COVID-19 infection and hospitalization, whereas those without the anti-A antibody (A and AB) are risks. The A + AB frequency increases from 54.7 % in uninfected controls to 57.

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