الباحثون

Ahmed Al-Siyabi

المنشورات 2

مقال بحثي وصول مفتوح

Prevalence of Obstructive Sleep Apnea Among Patients with Secondary Polycythemia: A Retrospective Cross-sectional Study

Ahmed Al-Siyabi, بدر الرواحي, Murtadha Al-Khabouri وآخرون · مجلة عُمان الطبية · 2025 · 10.5001/omj.2025.82

Objectives: Obstructive sleep apnea (OSA) and secondary polycythemia occasionally occur together, but their relationship remains unclear. This study aimed to explore the prevalence of OSA among patients with secondary polycythemia in our local population. Methods: In this retrospective cross-sectional study, we screene …

مقال بحثي وصول مفتوح

Improved Diagonal Hessian Approximations for Large-Scale Unconstrained Optimization

Ahmed Al-Siyabi · مجلة جامعة السلطان قابوس للعلوم · 2022 · 10.53539/squjs.vol26iss2pp126-140

We consider some diagonal quasi-Newton methods for solving large-scale unconstrained optimization problems. A simple and effective approach for diagonal quasi-Newton algorithms is presented by proposing new updates of diagonal entries of the Hessian. Moreover, we suggest employing an extra BFGS update of the diagonal u …

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