Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/15956

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Department: search.filters.department.LİSANSÜSTÜ EĞİTİM ENSTİTÜSÜ / ELEKTRİK-ELEKTRONİK MÜHENDİSLİĞİ ANABİLİM DALISubject: search.filters.subject.Electrical and Electronics Engineering

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Now showing 1 - 2 of 2
  • Master Thesis
    Askeri standartlarla uyumlu DC-DC dönüştürücü tasarımı
    (2026) Ovalı, İsmail; İskender, İres
    This thesis investigates the design and implementation of a DC-DC converter compliant with military standards. Power electronic systems used in military applications are required to operate reliably under harsh environmental and electrical conditions such as high electromagnetic interference (EMI), voltage spikes and surges, and reverse polarity. Therefore, the developed DC-DC converter must ensure robust and stable operation under these challenging conditions. Within the scope of this study, the military standards MIL-STD-461G, MIL-STD-1275E, and MIL-STD-704F related to DC–DC converters are examined. To meet the EMI requirements defined by MIL-STD-461G, an EMI filter is designed and prototyped, and the design is validated through the MIL-STD-461G CE102 test. In addition, the frequency attenuation characteristics of the EMI filter are obtained using a Bode Analyzer, and the measurement results are compared with simulation outcomes. To satisfy the electrical and transient voltage requirements specified in MIL-STD-1275E and MIL-STD-704F, an input protection circuit consisting of spike protection, reverse polarity protection, and surge protection is designed and prototyped. The proposed protection circuit successfully passes the MIL-STD-1275E compliance tests. In order to achieve high efficiency over a wide input voltage range, a two-stage isolated DC–DC converter architecture is adopted instead of a single-stage isolated topology. The first-stage performs voltage regulation using a synchronous buck converter, while the second-stage provides galvanic isolation through a full-bridge converter with synchronous rectification. The proposed two-stage isolated DC-DC converter is modeled and simulated in the MATLAB Simulink environment. Finally, the obtained results are discussed and future work is outlined.
  • Master Thesis
    Analysis and Efficient Use of IPv6, Comparison with IPv4
    (2026) Yıldırım, Aleyna Gülin; Baykal, Yahya Kemal
    This thesis aims to examine the Internet Protocols IPv4 and IPv6, which constitute the fundamental building blocks of computer networks, from both technical and conceptual perspectives, and to reveal the reasons for the transition to IPv6. The constant advancement of information technologies and the current increase in internet-based applications have necessitated a better adoption of network systems. Therefore, understanding the different layers of network communication and the protocols used is extremely important, both theoretically and practically. This study begins by thoroughly analyzing all seven layers of the OSI model, explaining the functions and roles of each layer in network communication. It then examines the TCP/IP model, focusing on its similarities and differences with the OSI model. In particular, the relationship between the Transport Layer (Layer 4) and the Network Layer (Layer 3) regarding the continuity and reliability of network communication is investigated. The next part of the thesis focuses on the addressing structure, packet delivery method, and existing limitations of the IPv4 protocol. Considering the increasing number of internet users and the potential exhaustion of addresses, the necessity of using the IPv6 protocol is emphasized. The advanced technologies offered by IPv6, such as its wide address space, simple header structure, and extended headers, are discussed in detail. Furthermore, some comparisons are made between IPv4 and IPv6 headers, and the conditions for the transition process to IPv6 are clearly presented. In conclusion, this study establishes a balanced approach between the models and protocols that form the fundamental structure of network technologies. It aims to clarify the practical applications and theoretical structure of internet protocols. As a result, this thesis serves as a highly important reference for those working on or studying such topics, particularly regarding the rollout and development of IPv6.