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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Data Fusion of Maintainability Analysis of a Military Aircraft Modernization Project
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2026) Pahsa, Alper
For military Airborne Early Warning and Control (AEW&C) aircraft undergoing system modernization, this study explores the use of data fusion models, particularly Kalman filtering, to forecast maintainability parameters in modernization of communication systems with different alternatives. sThese parameters are used to compare with legacy communication system values to be compared. Mean Time to Repair (MTTR), the crucial maintainability statistic once mission equipment is modified or replaced, is the subject of the study. Accurate maintainability projection for updated Airborne Early Warning & Control (AEW&C) systems is crucial for operational mission success and sustainability as military operations rely more and more on cutting-edge technology. The approach estimates maintainability characteristics for freshly manufactured equipment without past failure data by utilizing engineering evaluations, manufacturer data, and maintenance records via a Bayesian filtering framework. Data from the Peace Eagle (E-7T) modernization project is used to validate the method by contrasting several options for equipment purchasing. The findings show that data fusion based on Kalman filters yields accurate maintainability predictions that meet system requirements and allow for quantitative comparison of various modernization strategies.
Pressure Stress Coupled Deterministic Modeling of Multiphase Flow in Fractured Reservoirs
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2026) Otamere, Blessing; Oyovwevotu, Stephen Onome
Fractured reservoirs exhibit complex flow behavior due to strong coupling between fracture matrix interaction, multiphase transport, and pressure induced geo mechanical effects. This study develops a deterministic dual porosity multiphase model that explicitly incorporates poroelastic stress coupling and stress dependent permeability. Analytical results establish the positivity and boundedness of solutions, ensuring physical admissibility of saturations, pressures, stress, and porosity. Equilibrium states are derived and their local stability is examined through linearization and eigenvalue analysis. The results show that system Dynamics are governed by real eigenvalues and that stress induced permeability degradation leads to steady state bifurcations associated with loss or exchange of fracture matrix connectivity, while oscillatory instabilities are excluded. Numerical simulations using representative literature-based parameters are compared with published coupled reservoir geo mechanical studies. The predicted fracture and matrix pressure ranges (20–27 MPa and 18–24 MPa, respectively) and effective stress evolution (15–22 MPa) agree well with reported values. Permeability reductions of one to two orders of magnitude are reproduced, and saturation dynamics demonstrate rapid fracture response and delayed matrix behavior. These results confirm that the proposed reduced order model reliably captures key features of stress coupled fractured reservoir systems.
GIS-Based Estimation of Corrected Standard Penetration Number Using the Best Semi-Variogram Model for Naogaon Sadar
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2026) Rahman, Mahabub; Alam, Nur; Sarder, Maharullah
The objective of this study is to calculate the corrected standard penetration number (SPT-Nc) and generate SPT-Nc thematic maps using the best-fitting semi-variogram model. The study is based on 79 standard penetration tests (SPTs) carried out at five SPT measurements per test on each borehole, at depths of 3 m, 6 m, 9 m, 12 m, and ~15 m from the ground surface. A number of factors, such as density, GW table, and overburden pressure, in addition to other correction factors, were introduced to obtain SPT-Nc values. The SPT-Nc at each depth was then computed with Microsoft Excel. Maps obtained as a result of this procedure were subjected to GIS-based thematic maps; for each map a different color was used to indicate the value of SPT-Nc. Maps were generated using ordinary kriging interpolation and tested with six semi-variogram models to find the best-fitting model. Among the six models, the stable, k-bessel and Gaussian semi-variogram models were selected for having the least nugget-to-sill ratio. Since underground consists of clay soil at shallow depths, SPT-Nc was less than 24 and 32 at 3 m and 6 m, respectively. At a depth of 9 m, SPT-Nc ranged from 21 to 35, covering 70.23% of the area measured. At a depth of 12 m, SPTNc reached a maximum of 47 due to the decrease in clay content. The greatest values were recorded at 15 m, with 82.6% of the area with SPT-Nc between 38 and 51.
Application and Research Centers Coordination Unit: Monthly Bulletin (May 2026)
(İstanbul Gelişim Üniversitesi / Istanbul Gelisim University, 2026) Application and Research Centers Coordination Unit
Urban and Architecture Seminars 4: Urban Studies from the Perspective of Architecture Graduate Students The fourth event of the “Urban and Architecture Seminars” series was organized in collaboration between the Environment, Urbanization and Earth Sciences Application and Research Center and the Istanbul Studies Application and Research Center. During the program, graduate students in Architecture presented their academic studies and contemporary approaches to urban issues, creating an interdisciplinary platform for knowledge sharing. Within the scope of the event, topics such as the arcades of Beyoğlu, the transformation of Büyükdere Avenue, spatial segregation in Süleymaniye, urban memory, the transformation of cul-de-sacs, and the accessibility of Istanbul’s public squares were discussed, while theoretical and practical approaches were evaluated together.
Uygulama ve Araştırma Merkezleri Koordinatörlüğü: Aylık Bülten (Mayıs 2026)
(İstanbul Gelişim Üniversitesi / Istanbul Gelisim University, 2026) Uygulama ve Araştırma Merkezleri Koordinatörlüğü
Kent ve Mimarlık Seminerleri 4: Mimarlık Yüksek Lisans Öğrencilerinin Perspektifinden Kentsel Çalışmalar Çevre Şehircilik ve Yer Bilimleri Uygulama ve Araştırma Merkezi ile İstanbul Çalışmaları Uygulama ve Araştırma Merkezi iş birliğinde “Kent ve Mimarlık Seminerleri” serisinin dördüncüsü gerçekleştirilmiştir. Programda Mimarlık lisansüstü öğrencileri, kentsel meselelere dair güncel yaklaşımlar ve akademik çalışmalarını sunarak disiplinler arası bir paylaşım ortamı oluşturmuştur. Etkinlik kapsamında Beyoğlu pasajları, Büyükdere Caddesi’nin dönüşümü, Süleymaniye’de mekânsal ayrışma, kentsel hafıza, çıkmaz sokakların dönüşümü ve İstanbul meydanlarının erişilebilirliği gibi konular ele alınarak teorik ve pratik yaklaşımlar birlikte değerlendirilmiştir.