DSpace Arşivi :: Ana Sayfa

İstanbul Gelişim Üniversitesi Kurumsal Açık Erişim Arşivi

DSpace@Gelişim, İstanbul Gelişim 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 yayınların etkisini artırmak için telif haklarına uygun olarak Açık Erişime sunar.

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Assessment of Sleep Quality in Pediatric Patients Using Hearing Aids and Cochlear Implants: Cross Sectionalstudy
(SPRINGER, ONE NEW YORK PLAZA, SUITE 4600 , NEW YORK, NY 10004, UNITED STATES, 2026) Daban, Zeynep; Doğan, Umahan Kübra
Background Hearing loss in children can negatively impact various developmental domains, but its efect on sleep quality is often overlooked. This study aimed to evaluate and compare the sleep quality of school-aged children with hearing loss using diferent device modalities—specifcally bilateral hearing aids, unilateral cochlear implants, bilateral cochlear implants, and bimodal stimulation—with that of their age- and gender-matched normal-hearing peers. Results Children with hearing loss exhibited signifcantly higher total sleep disturbance scores compared to the control group (median total T-score: 64.0 vs. 51.0, p<0.001). Specifcally, the study group demonstrated signifcantly higher disturbances in sleep breathing disorders, disorders of arousal, sleep-wake transition disorders, and sleep hyperhidrosis (all p<0.001). When comparing the study subgroups based on their specifc hearing devices (bilateral hearing aids, unilateral cochlear implants, bilateral cochlear implants, and bimodal users), a signifcant diference was observed uniquely in the domain of disorders of initiating and maintaining sleep (p=0.004); post-hoc analysis confrmed that bilateral cochlear implant users experienced clinical-level difculties (mean T-score: 74.30±11.10) compared to both bilateral hearing aid (55.80±6.65; adjusted p=0.006) and unilateral cochlear implant users (58.80±5.67; adjusted p=0.012). Additionally, a delayed age of hearing device ftting was positively correlated with increased sleep breathing disorders (r=0.324, p=0.030). Conclusions The sleep quality of children with hearing loss is signifcantly more impaired compared to their normalhearing peers, particularly concerning breathing, arousal, and sleep transitions. These fndings support the clinical hypothesis that daytime auditory fatigue and sensory transition contrasts may negatively infuence pediatric sleep architecture. Incorporating routine sleep screenings using standardized tools like the SDSC during audiological followups is critical to facilitate timely multidisciplinary referrals to pediatric sleep specialists and ensure optimal holistic development.
Techno-Economic and Environmental Evaluation of a Campus-Scale Floating Photovoltaic System in Burdur, Türkiye
(ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2026) Dursun, Bahtiyar; Aykut, Ercan; Görgülü, Sertaç; Ülker Dursun, Sibel
This study presents a techno-economic and environmental evaluation of a campus-scale floating photovoltaic (FPV) system proposed for the campus lake of Burdur Mehmet Akif Ersoy University in Burdur, Türkiye. The assessment integrates lake-surface utilization, site-specific solar-resource conditions, actual campus electricity demand, discounted life-cycle economic analysis, environmental assessment, deterministic sensitivity analysis, and multi-parameter Monte Carlo uncertainty analysis. The contribution of the study lies in integrating sitespecific FPV sizing and actual campus electricity-demand matching with discounted life-cycle economic analysis, environmental assessment, deterministic sensitivity analysis, and multi-parameter Monte Carlo uncertainty analysis within a single assessment framework. A total lake area of 12,000 m² is considered, with 40% allocated to FPV deployment. Using 580 W crystalline-silicon modules, 3000 h/year of solar duration, and a performance ratio of 0.80, the proposed 1.08 MW system is estimated to generate approximately 2592 MWh/year, corresponding to nearly 30% of annual campus electricity demand. Under the harmonized 25-year life-cycle assumptions, including 0.5% annual energy degradation, 2% annual O&M escalation, an inverter replacement in year 15, and an 8% discount rate, the discounted LCOE is approximately 0.0745 USD/kWh, the NPV is approximately 0.68 million USD, the IRR is approximately 12.91%, and the discounted payback period is approximately 10.97 years. A 10,000-run Monte Carlo analysis yields a positive NPV in approximately 97.5% of simulations. The system could also avoid approximately 1166 tCO₂/year under the adopted grid-emission factor. The results support FPV as a promising campus-scale option while emphasizing that detailed PV simulation, engineering design, and site-specific ecological monitoring are required before implementation.
Guideline-Based Evaluation of Five Generative Artificial Intelligence Chatbot Platforms for Clinician-Oriented Questions on Open Temporomandibular Joint Surgery
(ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2026) Gaş, Selin; Sulukan, Erdinç; Korkmaz, Büşra
Objective: To compare the quality and readability of responses from five generative artificial intelligence chatbot platforms to clinician-oriented questions on open temporomandibular joint (TMJ) surgery against guideline-based reference answers. Material and methods: Forty questions across eight domains were submitted on 16 July 2026 to ChatGPT (GPT5.5), Claude (Opus 4.8), Gemini (3.1 Pro), Grok (4) and Perplexity (Pro), each via its paid tier at default settings (200 responses). Two blinded oral and maxillofacial surgeons applied the Quality Analysis of Medical Artificial Intelligence (QAMAI) tool, the Global Quality Score (GQS) and a five-point overall quality rating using a priori key elements and written anchors. Readability was assessed with the Flesch-Kincaid Grade Level (FKGL) and Flesch Reading Ease Score (FRES); platforms were compared with the Friedman test and Bonferroni-corrected Wilcoxon post-hoc tests; inter-rater reliability used intraclass correlation coefficients (ICC). Results: Inter-rater reliability was good to excellent (average-measure ICC 0.93−0.99). All outcomes except clarity differed among platforms (P < .001). Perplexity achieved the highest QAMAI total (27.5 ± 1.4; Kendall’s W = 0.75), largely through retrieval-based source provision; excluding this domain, Claude, Perplexity and Gemini converged. Claude had the highest GQS (4.5 ± 0.6), Gemini the highest overall rating (4.3 ± 0.7); Grok scored lowest. Claude and Gemini were least readable (median FKGL 22.7 and 26.1; FRES −11.6 and −7.5). Length did not explain scores within platforms. Conclusions: Performance varied substantially across platforms and dimensions; no platform optimized all outcomes. These findings describe informational quality, not clinical safety or decision-making, and support specialist verification before clinical use.
Dual-Channel Modular Phase Change Material Thermal Energy Storage Inspired by Plate Heat Exchangers: ANN-Assisted Optimization Using a Multilayer Perceptron
(PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, 2026) Li, Yonghui; Basem, Ali; Khan, Mohammad Nadeem; Ismail Kh, Teeba; Zhang, Haibo; Alsairy, Norah; Althbiti, Ashrf; Rakhmanov, Zafar; Albalawi, Hind; Mahariq, Ibrahim
The growing integration of renewable energy systems has heightened the demand for efficient thermal energy storage technologies to balance energy supply and demand. Phase change material (PCM)-based latent heat storage systems are attractive owing to their significant energy storage density and nearly isothermal operation; nevertheless, conventional configurations often suffer from low heat transfer rates, non-uniform melting, and limited scalability. In many heat-exchanger-inspired designs, heat transfer fluid (HTF) channels are located only along the outer boundaries of the PCM enclosure, leaving the central region thermally underutilized. To mitigate these drawbacks, the current work develops a novel modular energy storage system inspired by plate heat exchanger architecture. The system consists of 60 independent units that allow flexible assembly and scalable storage capacity. A key innovation is the incorporation of an additional HTF channel inside the PCM enclosure, forming two parallel heat transfer paths that enhance the effective heat transfer surface and decrease thermal resistance. To accelerate the design process, a multilayer perceptron surrogate model was developed to anticipate stored energy during charging. A two-stage optimization framework based on a genetic algorithm and the TOPSIS method was applied to identify the optimal configurations. The optimized designs demonstrated remarkably better performance than the reference configuration. At 9000 s, the half-time optimized design stored the largest amount of energy, reaching 9402 kJ, followed closely by the balanced design, which stored 9287 kJ, while the full-time optimized design stored 8654 kJ. In comparison, the core design stored only 3818 kJ at the same time. Compared with the core design, the stored energy improved by approximately 146% for the half-time optimized design, 126.6% for the full-time optimized design, and 143.2% for the balanced design. At the end of the melting process (18,000 s), the liquid fractions were 0.9649 for the half-time optimized design, 1 for both the full-time optimized design and the balanced design, and 0.3745 for the reference configuration. Correspondingly, the stored energy increased from 6457 kJ in the core design to 12,585 kJ, 13544 kJ, and 13,113 kJ for the half-time optimized design, full-time optimized design, and balanced design, respectively, representing improvements of up to 109.8%.
Convexity in Terms of Caputo Fractional Derivatives
(EDP SCIENCES S A, 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE, 2026) Mousaab, Bouafia; Adnan, Yassine; Abdeljawad, Thabet
The first criterion of convexity states that a differentiable function defined on an open interval is convex if and only if its first derivative is increasing. The second criterion of convexity states that a twice differential function is convex if and only if its second derivative is positive. In this work, by using a change of variable transforming the interval [𝑎, 𝑡] into [0, 1], we are able to get a new formulation of Caputo derivative.