Browsing OzU Theses & Dissertations by Author "Demiroğlu, Cenk"
Now showing items 21-38 of 38
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Multi-hop hybrid FSO/RF communication systems
Kazemi, Hossein (2014-08)The reliability of free-space optical (FSO) links is severely restricted by weather-dependent atmospheric phenomena including absorption, scattering and turbulence. An efficient solution is to build hybrid links where a ... -
Multi-lingual depression-level assessment from conversational speech using acoustic and text features
Özkanca, Yasin Serdar (2018-12-19)Depression is a common mental health problem around the world with a large burden on economies, well-being, hence productivity, of individuals. Early diagnosis and detection of depression can aid treatment, but diagnosis ... -
On the correlation of psychoacoustic metrics with mushra-based subjective sound quality perception for televisions
İşlek, Çağlar (2019-08-09)Even though the loudspeaker technologies used in televisions (TVs) and objective sound quality assessment techniques had continuously advanced over the years, the literature on automatic sound quality assessment in the TV ... -
Performance analysis of multi-relay free space optical communication systems
Mostaani, Zohreh (2015-01)Free space optical (FSO) communication has attracted a great attention in recent years because of their high bandwidth capacity in unregulated spectrum which makes them a cost-effective and easy-to-install alternative to ... -
Performance analysis of multiuser free space optical communications
Zhalehpour, Sasan (2014-08)Terrestrial Free Space Optical (FSO) communications involve using optical beams to carry information through atmospheric channels between two points. Unlike radio frequency (RF) communications, FSO systems are not burdened ... -
Performance evaluation and experimental verification of vehicular visible light communication
Araç geliştirme, gelecekteki bazı uygulamalarını desteklemek için büyük ölçüde veri iletişimine aktarır. Araç müfrezesi ve otonom araçlar (AV), bu on yılda ticari olarak temin edilebilecek uygulamalardan bazılarıdır. Bu ... -
Relay-assisted OFDM-based visible light communications
Narmanlıoğlu, Ömer (2016-08)In this study, a relay-assisted visible light communication (VLC) system where an intermediate light source cooperates with the main light source is investigated. Specifically, two light sources in an office space; one is ... -
Safety test procedures, standards and results for Electric Bike Battery
Recently, battery project studies have been increasing worldwide. Companies carrying out these projects must have their products checked for design safety and must obtain test approval reports in order to release their ... -
Speaker adaptation with deep learning for text-to-speech synthesis systems
End-to-end (e2e) speech synthesis systems have become popular with the recent introduction of letter-to-spectrogram conversion systems, such as Tacotron, that use encoder-decoder-based neural architectures. Even though ... -
Speaker adaptation with minimal data in statistical speech synthesis systems
Mohammadi, Amir (2014-09)Statistical speech synthesis (SSS) systems have the ability to adapt to a target speaker with a couple of minutes of adaptation data. Developing adaptation algorithms to further reduce the number of adaptation utterances ... -
Spoofing and anti-spoofing techniques for text-independent speaker verification systems
Khodabakhsh, Ali (2015-10)There has been substantial progress in the speaker verification field in recent years. I-vector based approach in particular received significant attention due to its high performance. Improvements in the verification ... -
Standard-compliant and software defined VLC system: implementation and performance evaluation
Hussain, Waqas (2015-08)LED lighting is now a cost-effective and energy-efficient technology for general-purpose illumination. Recent advances in LED lighting allow us to use LEDs not only for illumination but at the same time for wireless ... -
State of charge estimation for lithium-based batteries
Çelik, Mert (2020-01)This thesis proposes a new State of Charge (SOC) estimation method for lithiumbased batteries, which o ers a good trade-o between convergence and computation times. Lithium-based battery packages are quite common in the ... -
Thermal and optical interaction of tightly packaged LEDs in automotive lighting applications
Uras, Umut Zeynep (2018-11-20)This study aims to enhance the thermal management of an LED light engine for automotive exterior lighting with an advanced heat spreader. Although LEDs have many advantages, their applications require an accurate thermal ... -
Uncertainty assessment for speaker verification systems using a bayesian approach
Süslü, Çağıl (2021-01-18)The Automatic Speaker Verification (ASV) systems are developed to discriminate the genuine speakers from the spoofing attacks and they are also used as a security application in various industries (e.g., Banking and ... -
Using eigenvoices and nearest-neighbours in HMM-based cross-lingual speaker adaptation with limited data
Sarfjoo, Seyyed Saeed (2017-08)Thesis abstract: Cross-lingual speaker adaptation for speech synthesis has many applications, such as use in speech-to-speech translation systems. Here, we focus on cross-lingual adaptation for statistical speech synthesis ... -
Visible light communications with advanced physical layer features and integration with existing wireless communication technologies
Optical wireless communication systems that operate in the visible light frequency band (390-700 nm) are called as visible light communication (VLC). VLC systems are based on the principle of modulating light emitting ... -
Vulnerability of speaker verification system under replay spoofing attack and investigation of synthetic speech detection
Özbay, Mustafa Caner (2016-05)Security issues have become major subject along with developments in the speaker verification system. Previous studies have shown that performance is still not fully proven for vulnerability. Simple and easy methods may ...
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