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Browsing Meslek Yüksekokulları by WoS Q Quality "Q4"
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- ItemAnalytical ETBDW Formulation for Electromagnetic Scattering by Circular Apertures on PMC Surfaces(Springer, 2025-12) Altınel, Mustafa; Yalçın, Uğur; 414019This study presents and validates a uniform analytical formulation for electromagnetic diffraction from circular apertures on perfect magnetic conductor (PMC) surfaces using the extended boundary diffraction wave (ETBDW) theory. The proposed PMC–ETBDW model incorporates an in-phase reflection coefficient ( = +1) within the boundary kernel, producing a physically continuous and energy-conserving representation of diffracted fields across illuminated, transition, and shadow regions. Expressed through detour parameters and Fresnel-type transition functions, the formulation eliminates phase discontinuities and maintains amplitude normalization consistent with theoretical energy conservation. Numerical evaluations performed for representative aperture radii (a = λ–3λ) and observation distances (r = 3λ–9λ) confirmed the expected 1/r amplitude decay, smooth Fresnel–Fraunhofer transitions, and constructive interference associated with magnetic reflection. Comparative analyses with PEC and opaque boundaries verified that in-phase magnetic reflection enhances on-axis field intensity and preserves phase continuity near the shadow boundary, in full agreement with the dual electromagnetic behavior predicted for PMC interfaces. Beyond its theoretical completeness, the proposed formulation provides a compact and computationally efficient framework for diffraction modeling and hybrid solver integration, offering practical applicability to magnetic coatings, low-RCS reflectors, and metasurface-based structures.
- ItemIncreasing Cases of Retroperitoneal Fibrosis After Covid-19: Case Report, Did She Die Retroperitoneal Fibrosis or Cancer?(Emergency Medicine Physicians Assoc Turkey, 2024-03) Deniz, Gulnihal; Cakir, Murteza; Bilgin Akyagci, SerpilThis case report details the unfortunate journey of a 59-year-old breast cancer survivor who developed secondary Retroperitoneal Fibrosis (RPF) in 2022. Despite diligent treatment efforts, her condition took a devastating turn when, in June 2023, she was diagnosed not only with persistent RPF but also with advanced liver, omental, and duodenal cancer. Tragically, her condition deteriorated rapidly, leading to her passing on day 41 following her presentation. This case underscores the challenges of diagnosing and treating RPF. It highlights the importance of considering cancer development in advanced RPF cases that do not respond to treatment, often leaving limited options for effective intervention.
- ItemOutcomes of Liver Transplantation in Infants: A Retrospective Cohort Study(Elsevier, 2024-12) Erbiş, Halil; Kılınç, Eyyüp Mehmet; Fırat, Aynur; Aliosmanoğlu, Çiğdem; Ağca, Mevlüt Harun; Aliosmanoğlu, İbrahim; 104930Background. Liver transplantation (LT) is a crucial treatment for infants with end-stage liver disease, yet specific data on LT outcomes in infants under 12 months old remain limited. This study aims to present the clinical course and outcomes of infants who underwent LT, assessing the impact of demographic and etiological differences on mortality and survival. Methods. A retrospective analysis was conducted on 64 infants (< 12 months) who underwent LT between January 2019 and March 2024. Demographic, clinical, and laboratory data were collected from their medical records. LT-specific details, postoperative complications, and survival data were analyzed. Results. The median age of the infants was 157 days, with 37 boys (57.8%) and 27 girls (42.2%). Biliary atresia was the most common diagnosis (85.9%), and seven infants had undergone a previous Kasai procedure. The median pediatric end-stage liver disease (PELD) score was 15.5. Left lateral segmentectomy was the predominant graft type (60.9%). The median pediatric intensive care unit (PICU) and hospital stays were 5 and 21 days, respectively. Complications occurred in 20 infants (31.3%), with vascular and biliary complication rates both at 12.5%. The overall mortality rate was 17.2%, with early (30-day) and late mortality rates of 6.3% and 10.9%, respectively. The median overall survival (OS) was 204.5 days, and the 1-year survival rate was 32.8%. Kaplan-Meier and log rank analyses showed no significant impact of sex, age, diagnostic groups, graft type, or surgical complications on OS (P> .05). Conclusions. LT in infants can be performed with acceptable morbidity and mortality rates, particularly with increased experience and standardized protocols.
- ItemThe role of ergonomics training and posture exercises in surgeons’ musculoskeletal system disorders(Turkish Surgical Assoc, 2024-09) Külekçioğlu, Sevinç; Dilektaşlı, Evren; 249947Objective: The surgeon needs to understand the risks involved in performing surgery with ergonomic errors. Although there are many barriers to ergonomic effectiveness, success begins with the surgeon’s awareness, recognition of existing obstacles, and education. The main purpose of the study is to evaluate the effect of ergonomic training and posture exercises on the surgeon’s pain, physical workload, psychological state, and quality of life to prevent musculoskeletal system disorders and extend career life. Material and Methods: Surgeons who had completed at least one year in their profession, worked an average of 40 hours a week, had musculoskeletal pain in at least one area, and volunteered to participate in the study, regardless of gender and age, were included in the study. Researchers carried out the ergonomics training and exercise program individually by giving face-to-face training. Surgeons were asked to complete the physical workload questionnaire (PWQ), Beck depression index (BDI), and short form health survey (SF-36) before and one month after the study. Changes in visual analogue scale (VAS) and activities of daily living were recorded. Results: Surgeons who received ergonomic training and exercise programs showed significant improvements in pain, physical workload, depression, and quality of life measurements. Conclusion: To prevent fatigue and pain resulting from the accumulation of ergonomic flaws, surgeons should be trained and guided on proper posture and endurance, and encouraged to maintain a comfortable and natural posture.
