Yayın tarihi için Fen Bilimleri Enstitüsü listeleme
Toplam kayıt 86, listelenen: 1-20
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Physical layer security schemes for wireless communication systems
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2016)Security in wireless communications has always been a major concern due to the broadcast nature of the radio waves. Apart from the conventional cryptologic methods that are performed in the upper layers, physical-layer ... -
Air-ground channel modeling and waveform containment
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)The content of this work is divided into two main parts. Part I is dedicated for characterizing Air-Ground channels. Applications using Air-Ground communications are expected to grow in the future. Low altitude phases of ... -
Neural network-based adaptive myoelectric signal classification via utilization of entropy history
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)The surface electromyography (sEMG) signals emanating from the remnant forearm muscles of transradial amputees are eligible for controlling robotic prostheses to replace the functions of the lost hand. sEMG pattern recognition ... -
Finite element analysis of cervical spine & finite element modeling of knee joint
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)Finite Element (FE) analysis allows predicting the behavior of real life systems in controlled environment. In the recent decades, FE modeling has gained significant attention of the medical industry as well. There is no ... -
On the design of a flexible waveform and low ici symbol boundary alignment
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)Cellular systems of fifth generation (5G) radio access technology is expected to support a wide variety of service requirements in different applications. High reliability, flexibility, spectral efficiency, and low power ... -
Development of a histotripsy agent using host-guest interaction
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)Histotripsy is a mechanical cell ablation technique, which works on the mechanism of acoustic cavitation using microsecond-long, high-frequency ultrasound (US) pulses that can generate a bubble cloud (cavitation) using the ... -
Extracting sub-exposure images from a single capture through fourier-based optical modulation
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)Through pixel-wise optical coding of images during exposure time, it is possible to extract sub-exposure images from a single capture. Such a capability can be used for different purposes, including high-speed imaging, ... -
Signal processing techniques for security enhancement of wireless networks at the physical layer
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)Broadcast nature of wireless communications enables reaching multiple parties simultaneously. However, due to this property, the security of information trans- mission is prone to eavesdropping of unauthorized receivers. ... -
Compensation of mutual coupling in transmitting arrays of thin wire antennas
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)In the classical approach of antenna array theory, mutual coupling between elements is usually ignored. However, depending on the application, errors due to mutual coupling can be significant. This thesis presents a numerical ... -
Development of a wireless multichannel neural data transmission system
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)Implantable microelectrode arrays enable multichannel electrophysiological recordings from the mammalian brain during behavioral experiments. Wireless data transmission systems combined with the microelectrode arrays and ... -
2d CMUT array based ultrasonic micromanipulation of particles
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)The thesis introduces a concept of combining row column addressed CMUT arrays with microfluidic channel to enable trapping and two-dimensional manipulation of micro-particles. In this work a multilayer planar resonator ... -
Extending light field camera capabilities
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)A traditional camera captures an image by projecting a scene on a two-dimensional image sensor plane regardless of the direction light rays coming onto the sensor. A light field camera, in contrast, records light rays in ... -
Super resolution of light fields using convolutional neural network
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)Light field imaging extends the traditional photography by capturing both spatial and angular distribution of light, which enables new capabilities, including post-capture refocusing, post-capture aperture control, and ... -
Advanced cross-layer secure communication designs for future wireless systems
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)Due to the inherent vulnerability of wireless transmission to eavesdropping, con- dentiality arises as a challenging issue especially for future wireless networks because of their unique requirements. To cope with this, ... -
FM band channel measurements and modelling
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)As the demand for higher data rates increases every day, the need for new frequency bands becomes more and more prominent. The FM band between 88 and 108 MHz is one of the bands that are not fully utilized. This band for ... -
Emulation techniques for small scale fading aspects of wireless channels by using reverberation chamber
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)Reverberation chambers (RVCs) are used to provide an effective and reliable testbed for emulating wireless channel effects in the laboratory environment. Various techniques that enrich the capabilities of the RVC in channel ... -
Design of a voltammetry system for in vivo measurement of dopamine concentration
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)Dopamine has a critical role in motor control, motor learning, reinforcement learning, cognition, attention and motivation. Consequently, the physiology of the dopaminergic system is an important and highly active research ... -
Wireless channel modeling in the TVWS band based on measurements
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)In this thesis, we study TV white space (TVWS) bands, which can be used in next generation networks, in indoor-indoor and indoor-outdoor environments. Path loss measurements are taken at the beginning, middle, and at the ... -
NOMA multi-numerology and guard reduction methods in OFDM systems for 5g networks
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)Non-orthogonal multiple access (NOMA) is a promising technique which outperforms the traditional multiple access schemes in many aspects. It uses superposition coding (SC) to share the available resources among the users ... -
Aerial platforms utilization for future networks
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)Challenges facing the next generation of communication systems include utilizing the wireless networks in the rural areas and disaster situations, as well as the requirements of high capacity services and connectivity ...