Publications by authors named "Ahmed Omar"

Photovoltaic (PV) modules may encounter nonuniform situations that reduce their useable power volume, causing ineffective maximum power point tracking (MPPT). Moreover, due to the incorporation of bypass diodes, power-voltage (P-V) graph has multi-peaks when each component of the module receives different solar irradiation. This paper proposes a solution to this problem using an arithmetic optimization algorithm (AOA) for MPPT in PV systems operating in nonuniform situations.

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Pangenome indexes are promising tools for many applications, including classification of nanopore sequencing reads. Move structure is a compressed-index data structure based on the Burrows-Wheeler Transform (BWT). It offers simultaneous O(1)-time queries and O(r) space, where r is the number of BWT runs (consecutive sequence of identical characters).

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Purpose: To determine the robustness of randomized controlled trials (RCTs) supporting the current rhinosinusitis guideline; International Consensus Statement on Allergy and Rhinology: rhinosinusitis (ICAR-RS).

Materials & Methods: RCTs referenced by ICAR-RS with primary dichotomous outcomes were analyzed. The Fragility Index (FI) was calculated for trials with statistically significant findings.

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Background: Endoscopic bariatric interventions are viable alternatives to traditional weight loss surgeries for patients with a body mass index between 30 and 40 kg/m. While studies have explored the impact of intragastric balloons on obesity and weight reduction, comprehensive data on real-world device-related complications and failures are limited. This study aimed to investigate mechanical failures leading to patient adverse events reported to the US Food and Drug Administration.

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Introduction: Idiopathic intracranial hypertension (IIH) has been traditionally viewed as a neuro-ophthalmic disorder, yet emerging evidence suggests broader systemic implications. Our study investigates the cardiometabolic outcomes associated with IIH through a comprehensive matched-cohort analysis.

Methods: We conducted a retrospective analysis of electronic health records from 2009 to 2024.

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Background: Idiopathic intracranial hypertension (IIH) is a neurological disorder characterized by elevated intracranial pressure, predominantly affecting young women with obesity. This study evaluates the effectiveness of semaglutide as an adjunctive therapy to standard IIH management using real-world data.

Methods: We conducted a retrospective cohort analysis comparing IIH patients receiving semaglutide plus standard therapy versus standard therapy alone.

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Head and neck microvascular reconstruction is a complex but powerful tool following immediate cancer ablation or delayed sequalae after cancer treatment. Virtual surgical planning (VSP), using computer-aided design or computer-aided manufacturing has emerged as a potentially beneficial adjunct to head and neck reconstruction. The aim of this study was to assess the outcomes of VSP technology using the KLS Martin custom-made cutting guides and low-profile plates in head and neck microvascular reconstruction in our centre.

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The rice weevil Sitophilus oryzae is one of the primary insects that infest stored grains, causing both quantitative and qualitative losses. The use of synthetic pesticides to control it has led to the emergence of several problems related to human health and the environment, which has prompted the search for safer alternatives for their control. In this study, the effectiveness of two essential oils, cumin (Cuminum cyminum) and basil (Ocimum basilicum), was evaluated as insecticides for controlling the rice weevil at three different times intervals and various concentrations.

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Background: Wandering spleen or hypermobile spleen results from the elongation or maldevelopment of the spleen's suspensory ligaments. Few cases have been reported worldwide, making it a rare clinical entity. It usually affects children, although it also commonly affects female adults in the reproductive age range.

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The opioid epidemic continues to concern the CDC and public health officials but recent trends in opioid prescribing rates following common pediatric otolaryngology surgeries are unexplored. This retrospective cohort study queried the TriNetX Research database from January 1, 2010, through December 31, 2023, for pediatric patients who underwent tonsillectomy and/or adenoidectomy and received oral opioids within 5 days of surgery. Prescription trends from 2010 to 2017 were compared to 2022 to 2023, after the publication of multiple clinical practice guidelines (CPGs).

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Viral infections lead to a greater than twofold increased risk of developing chronic rhinosinusitis within 1 year. Viral infections lead to a greater than twofold increased risk of developing chronic rhinosinusitis within 1 year. Recurrent viral infections pose a greater risk of chronic rhinosinusitis than single episodes.

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The dermatological manifestations of the coronavirus cause severe acute respiratory syndrome. The current study investigates the morphological and histopathological relationship between the emergence of skin lesions and the severity of COVID-19 across the course of the disease via a cross-sectional study. There were skin lesions (maculopapular rash, vesiculobullous lesions, urticarial lesions, cutaneous thromboembolic "CT," and erythema multiforme-like lesions "EM-like") in confirmed COVID-19 instances.

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Background: The global healthcare system faces challenges in diagnosing and managing lung and colon cancers, which are significant health burdens. Traditional diagnostic methods are inefficient and prone to errors, while data privacy and security concerns persist.

Objective: This study aims to develop a secure and transparent framework for remote consultation and classification of lung and colon cancer, leveraging blockchain technology and Microsoft Azure cloud services.

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The present work investigates the mechanical properties of a composite material composed of multi-walled carbon nanotubes (MWCNTs), nano-aluminum powder (NAP), and glass fibers (GF) for five different compositions. The study further investigated how MWCNTs contribute to maintaining the mechanical properties of nanocomposites when exposed to elevated temperatures, up to 180 °C. The evaluation of impact strength revealed that the nanocomposite, composed of 2 % MWCNTs, 15 % NAP, and 10 % GF, demonstrated the greatest impact strength.

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Background and objective The continued prevalence and threat of coronavirus disease 2019 (COVID-19) have been reported, and evidence suggests that several people still get infected with the virus. Gaining a thorough understanding of the patient demographic factors and laboratory findings could contribute to assessing the severity, mortality, and progression of COVID-19. In light of this, the current study aimed to evaluate the demographic characteristics, laboratory findings, and outcomes of confirmed COVID-19 patients at a tertiary hospital in the Kingdom of Saudi Arabia (KSA).

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Article Synopsis
  • Anterior mandible defects impact support for essential functions like airway, feeding, and speech, which can result in complications for patients.
  • In a study involving four patients with these deformities, reconstruction was achieved using a fibula osteocutaneous flap for the mandible and a soft tissue flap for the lip and neck, with all flaps successfully surviving.
  • Post-surgery, patients transitioned from tube feeding to oral diets, tracheostomies were removed, drooling ceased, and speech improved significantly, demonstrated by a marked increase in the functional assessment score.
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The granular retrosplenial cortex (RSG) supports key functions ranging from memory consolidation to spatial navigation. The mouse RSG contains several cell types that are remarkably distinct from those found in other cortical regions. This includes the physiologically and transcriptomically unique low rheobase neuron that is the dominant cell-type in RSG layers 2/3 (L2/3 LR), as well as the similarly exclusive pyramidal cells that comprise much of RSG layer 5a (L5a RSG).

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The You Only Look Once (YOLO) deep learning model iterations-YOLOv7-YOLOv8-were put through a rigorous evaluation process to see how well they could recognize oil palm plants. Precision, recall, F1-score, and detection time metrics are analyzed for a variety of configurations, including YOLOv7x, YOLOv7-W6, YOLOv7-D6, YOLOv8s, YOLOv8n, YOLOv8m, YOLOv8l, and YOLOv8x. YOLO label v1.

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It has been widely suggested that the transition to battery electric vehicles will require 30% fewer assembly workers than those needed for internal combustion engine vehicles. Here, we use publicly available datasets on vehicle production and employment to show that labor intensity has increased at U.S.

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This research focuses on investigating the buckling strength of thin-walled composite structures featuring various shapes of holes, laminates, and composite materials. A parametric study is conducted to optimize and identify the most suitable combination of material and structural parameters, ensuring the resilience of structure under both mechanical and thermal loads. Initially, a numerical approach employing the finite element method is used to design the C-section thin-walled composite structure.

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Article Synopsis
  • Chronic rhinosinusitis (CRS) is linked to increased risks of developing anxiety and depression, but the role of socioeconomic factors in this relationship has not been fully studied.
  • A retrospective cohort study utilized the National Institutes of Health All of Us database, analyzing over 33,000 adult patients to examine the bidirectional risk of anxiety and depression in patients with CRS, with up to 5 matched controls without CRS.
  • Results indicated that patients with CRS had significantly higher odds (4.39 times) of having anxiety and 2.04 times for depression, along with a greater risk of developing these conditions compared to non-CRS controls after their CRS was diagnosed.
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Introduction: Despite effects on quality of life from olfactory and gustatory dysfunction (OD and GD), screening practices are limited, and patients' self-reporting of symptoms remains the only way to understand the burden of chemosensory dysfunction (CSD). Using a large population-based database, we sought to understand factors leading to reduced likelihood of discussing CSD with a provider.

Methods: The 2013‒2014 National Health and Nutrition Examination Survey (NHANES) chemosensory protocol was queried for factors influencing discussion of OD/GD with a healthcare provider.

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For taxonomic classification, we are asked to index the genomes in a phylogenetic tree such that later, given a DNA read, we can quickly choose a small subtree likely to contain the genome from which that read was drawn. Although popular classifiers such as Kraken use -mers, recent research indicates that using maximal exact matches (MEMs) can lead to better classifications. For example, we can ■ build an augmented FM-index over the the genomes in the tree concatenated in left-to-right order; ■ for each MEM in a read, find the interval in the suffix array containing the starting positions of that MEM's occurrences in those genomes; ■ find the minimum and maximum values stored in that interval; ■ take the lowest common ancestor (LCA) of the genomes containing the characters at those positions.

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