https://hdl.handle.net/20.500.12809/29 2026-04-06T12:54:30Z https://hdl.handle.net/20.500.12809/10851 Wireless Power Transfer for Underwater Vehicles Ağcal, Ali; Kalay, Altan; Çetin, Ramazan Wireless power transfer (WPT) through magnetic resonance coupling (MRC) offers a safe and simple solution for underwater (UV) vehicles without being affected by water conductivity. Due to its ease of control in WPT systems, the most suitable topology is Serial-Serial (SS). In this study, square transmitting and receiving coils with dimensions of 40 cm-40 cm were designed for 3.3 kW power transmission at 85 kHz. The design was studied in the air, pure water, and seawater environments. Three different cases were analyzed with ANSYS Maxwell 3D. The WPT system responded similarly in air and pure water environments. However, it was determined that the eddy current loss increased, the mutual inductance decreased, the coupling factor weakened, and the critical air gap decreased by about 0.2 cm in the seawater environment. The results showed that the WPT system's efficiency was similar for air and pure water but tolerably lower in the marine environment. Further, the health effects of the WPT design were examined through the ANSYS HFSS, in line with the IEEE standard and ICNIRP guidelines. 2023-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/10840 Network Real Time Kinematic (CORS-FKP Method) Accuracy in/Under Forest Area Kurtulgu, Zümrüt; Pırtı, Atınç The use of Global navigation satellite system (GNSS), (geolocation and navigation system) in/under forestry is increasingly being established, especially in the areas of logistics, inventory and measurements. However, the uninitialized forest user assumes that GNSS will always work with the same accuracy everywhere, while the more critical foresters assume that GNSS will probably not work properly in/under the forest. A criterion is often used to evaluate the performance of a GNSS receiver in an obstructed environment. Due to tree canopy in a forest, GNSS performance can be limited, disturbed or completely prevented. The Real Time Kinematics (RTK) approach can provide centimetre-level accuracy in a suitable environment. A more accurate and stable positioning technique was first proposed in the mid-1990s by meticulously modelling all fault components based on a known reference network called the Network Based RTK (NRTK) technique. Since then, several methods have been developed and implemented in practice, such as the Virtual Reference Station (VRS), the Flächen Korrektur Parameter (FKP) and the Master-Auxiliary Concept (MAC), which are fundamentally similar approaches. The purpose of all studies for this paper was to evaluate the achievable accuracy of the Continuously Operating Reference Stations (CORS)-FKP in the project area and check the results. The CORS-FKP results show that the solution for the forest area was reached at cm level (±10-15 cm) for horizontal accuracy. 2023-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/9649 Monitoring surface deformations of the reclamation site using PS interferometry: Senol Gunes sport complex (Turkey) Altıntaş, Fırat; Gökalp, Ertan Recently, structures, built on reclamation sites in the Eastern Black Sea region are quite remarkable. As one of them, Senol Gunes Medical Park Arena Sport Complex, which is located in Akyazi town of Trabzon city, is one of the rare areas in Turkey. It is very important to monitor surface deformations on this type of unfamiliar and very expensive constructions for protecting human life and property and for taking necessary precautions in advance. Persistent Scatterer Interferometry (PSI), based on the analysis of time series of multiple Synthetic Aperture Radar (SAR) data, is an invaluable geodetic tool to measure surface deformations. So, in this study, it is aimed to monitor the surface deformations on the reclamation site between the dates 20/12/2016-28/01/2020 by StaMPS (Stanford Method for Persistent Scatterers)-PSI technique using 96 Sentinel-1 SAR images. For processing, integration of European Space Agency (ESA) SentiNel Application Platform (SNAP) and StaMPS programs are used. After processing, surface deformations are determined as annual velocities (millimeter(mm)/year(y)) of PS points in the reclamation area along the line-of-sight (LOS) direction between the values -9.7 mm/y and 3.9 mm/y with an average standard deviation of 0.7 mm/y. From the results, it is understood that the area demonstrates very heterogeneous deformations rates, which occur on both horizontal and vertical directions because of the diversity and being on the reclamation site of the structures. 2021-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/9121 SOSYAL MEDYA PAZARLAMASI VE TÜKETİCİ SATIN ALMA DEĞİŞKENLERİ İLİŞKİSİ, SOSYAL KİMLİK VE ALGILANAN DEĞERİN ARACILIK ROLÜ ÜZERİNE BİR ARAŞTIRMA Atıgan, Fatma Dijital iletişimin gelişimine bağlı olarak sosyal medya pazarlama faaliyetleri markaların önemli bir alanı haline gelmiştir. Pazarlama yazınında söz konusu faaliyetlerin tüketicilerin çeşitli satın alma davranışlarına etkilerine ilişkin araştırmalar yer almaktadır. Bu çalışmada da tüketici satın alma davranışları olarak e-memnuniyet, e-güven ve e-bağlılık incelenmiştir. Ayrıca, sosyal medya pazarlama faaliyetlerinin etkisinde markalardan kaynaklanan değer algılarının ve sosyal kimliklerin de bu ilişkilerde rol oynadığına ilişkin yazında araştırmalar bulunmaktadır. Bu çalışmanın amacı, söz konusu değişkenler arasındaki ilişkileri analiz etmek, sosyal kimlik ve algılanan değerin aracılık rollerini ortaya koymaktır. Bu amaçla, yapılan ön araştırma ile uygun bir e-ticaret sitesi belirlenmiş ve ilişkiler bu marka üzerinden analiz edilmiştir. Elde edilen bulgular ilgili bölümde tartışılmış olup, çalışmanın, algılanan değer ve sosyal kimliğin birlikte aracılık rollerinin tespiti açısından yazına bir katkı sağlaması hedeflenmiştir. 2020-01-01T00:00:00Z