İstanbul Galata Üniversitesi Kurumsal Akademik Arşivi
DSpace@Galata, İstanbul Galata Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Accuracy of Polyvinyl Siloxane Ether and Other Impression Materials in Full-Arch Implant Rehabilitation with Varying Angulations: A Comparative in Vitro Study
(2025) Çapuroğlu, Akanay; Kayahan, Zeynep Özkurt; Kazazoğlu, Ender
This study evaluated the accuracy of digital and conventional impressions using different materials in fully edentulous jaws with implants at varying angulations. Two master models were fabricated: one with four parallel and another with four implants placed according to the all-on-4 protocol. Impressions were obtained using three materials—polyvinyl siloxane (PVS), polyether (PE), and polyvinyl siloxane ether (PVSE)—and a digital scanner (TRIOS 4). Conventional impressions were cast, scanned with an extraoral scanner, and compared with the reference models via Geomagic Control X software. In the parallel model, digital impressions exhibited significantly greater deviation values than PE (p=0.016). In the angulated model, PE demonstrated significantly lower deviation values compared to PVSE (p=0.007) and digital impressions (p=0.016). Deviation values increased with implant angulation in all groups, except PVSE, which showed no statistically significant difference. Polyether provided the highest accuracy. Implant angulation adversely affected accuracy across most impression methods
An Investigation of Sleep Quality, Stress, and Healthy Eating Status Among Shift-Working Firefighters: A Descriptive Cross Sectional Study
(2025) Schoinas, Ezgi Sakar; Anık, Sema; Erkul, Cahit
The aim of this study was to assess perceived stress, sleep quality, and healthy eating attitudes among fire department personnel and to examine the relationships among these variables, working in various units of the department daily. Methods: This descriptive cross-sectional study included 188 participants. Data were collected using a sociodemographic form, the Bergen Shift Work Sleep Questionnaire, the Perceived Stress Scale (Short Form), and the Attitude Scale for Healthy Nutrition (ASHN). Results: The ASHN total score was 75.84 ± 10.03, indicating generally positive nutrition attitudes. The Bergen score was 62.94 ± 19.15, reflecting moderate sleep disturbance. The Perceived Stress Scale score was 11.50 ± 2.61, showing moderate stress. Weak negative correlations were found between ASHN and the other scales, while Bergen and stress scores were positively correlated. Conclusions: Overall, shift-based, stressful firefighting work negatively affected sleep and stress.
Predictive Value of Complete Blood Count Parameters for Alzheimer's Disease in Relation to Periodontal Status
(Bentham Science, 2025) Karaduran, Kübra; Aydoğdu, Ahmet; Gelisin. Özlem; Günpınar, Sadiye
Given the role of inflammation in the development of both Alzheimer's disease (AD) and periodontal disease, it is plausible that periodontal disease may influence the progression of AD. Complete blood count (CBC) parameters may also serve as predictive indicators for this condition. This study investigated the predictive value of CBC parameters on the progression of AD in patients with periodontal disease.
Alzformer: Video-Based Space-Time Attention Model For Early Diagnosis Of Alzheimer’s Disease
(Pergamon-Elsevier Science, 2025) Akan, Taymaz; Akan, Sara; Alp, Sait; Ledbetter, Christina Raye; Bhuiyan, Mohammad Alfrad Nobel
Early and accurate Alzheimer’s disease (AD) diagnosis is critical for effective intervention, but it is still challenging due to neurodegeneration’s slow and complex progression. Recent studies in brain imaging analysis have highlighted the crucial roles of deep learning techniques in computer-assisted interventions for diagnosing brain diseases. In this study, we propose AlzFormer, a novel deep learning framework based on a space–time attention mechanism, for multiclass classification of AD, MCI, and CN individuals using structural MRI scans. Unlike conventional deep learning models, we used spatiotemporal self-attention to model inter-slice continuity by treating T1-weighted MRI volumes as sequential inputs, where slices correspond to video frames. Our model was fine-tuned and evaluated using 1.5 T MRI scans from the ADNI dataset. To ensure the anatomical consistency of all the MRI data, All MRI volumes were pre-processed with skull stripping and spatial normalization to MNI space. AlzFormer achieved an overall accuracy of 94 % on the test set, with balanced class-wise F1-scores (AD: 0.94, MCI: 0.99, CN: 0.98) and a macro-average AUC of 0.98. We also utilized attention map analysis to identify clinically significant patterns, particularly emphasizing subcortical structures and medial temporal regions implicated in AD. These findings demonstrate the potential of transformer-based architectures for robust and interpretable classification of brain disorders using structural MRI.
The Mediating Role of Psychological Empowerment and Trust in Leader on the Effect of Inclusive Leadership on Innovative Work Behavior: A Field Study in the Textile Industry in Turkiye
(Sage Publishing, 2025) Amirli, Hamran; Fettahlioğlu, Ömer Okan; Gül, Necmettin; Tatli, Hasan Sadik
The research is conducted with employees in the textile sector operating in Kahramanmarasx/T€urkiye. The study aims to examine the effect of inclusive leadership on employees’ innovative work behavior, as well as the mediating roles of trust in leader and psychological empowerment in this interaction. This cross-sectional study collected data from 275 employees in the textile industry of Kahramanmarasx/T€urkiye. The data were analyzed by the structural equation modeling (SEM) method using SmartPLS 4 software. The results of the analysis revealed that inclusive leadership has a direct positive effect on IWB. In addition, it was determined that inclusive leadership increases psychological empowerment and trust in leader. While psychological empowerment was found to have a significant mediating role in the relationship between inclusive leadership and innovative work behavior, the mediating role of trust in leader was not supported. The findings suggest that focusing on psychological empowerment in inclusive leadership practices is effective in increasing IWB. The limited effect of trust in leader on innovative work behavior indicates the complexity of leadership and employee interactions. Theoretical and practical implications and recommendations are presented at the end of the study.
