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Recent Submissions

Frequency estimation of a single real-valued sinusoid: An invariant function approach
Candan, Çağatay; Çelebi, Utku (2021-08-01)
© 2021 Elsevier B.V.An invariant function approach for the computationally efficient (non-iterative and gridless) maximum likelihood (ML) estimation of unknown parameters is applied on the real-valued sinusoid frequency es...
Comparison of the Effects of Nonlinearities for Si MOSFET and GaN E-HEMT Based VSIs
Yuruk, Huseyin; Keysan, Ozan; Ulutas, Baris (2021-07-01)
Nonlinearities in voltage source inverters (VSIs) such as; dead time, switching time, delay time, voltage drops on the power switches, parasitic capacitance, etc., are considered to be the main sources of the output voltag...
Maximum-likelihood direction of arrival estimation under intermittent jamming
Bilgi Akdemir, Şafak; Candan, Çağatay (2021-06-01)
© 2021 Elsevier Inc.Multiple-snapshot maximum-likelihood (ML) direction of arrival (DOA) estimation problem is studied for the intermittent jamming scenario. The intermittent jamming modality is based on the assumption tha...
Interband optical absorption obtained by pseudopotential method for type-II InAs/GaSb SL photodetectors
Akel, Kazim; HOŞTUT, MUSTAFA; Akın, Tayfun; Ergun, Yuksel (2021-05-01)
We have calculated interband optical absorption for InAs/GaSb based type-II superlattice (SL) structures. The empirical pseudopotential method (EPM) has been used as an alternative to the k.p method since it is less sophis...
Nature Allows High Sensitivity Thermal Imaging With Type-I Quantum Wells Without Optical Couplers: A Grating-Free Quantum Well Infrared Photodetector With High Conversion Efficiency
Beşikci, Cengiz (2021-04-01)
Quantum well infrared photodetectors (QWIPs) have facilitated thermal imagers with excellent pixel operability, uniformity and stability. The main disadvantage of the standard QWIP technology is the low conversion efficien...
Flat winding made of aluminum or copper sheet for axial flux machines
Çakal, Gökhan; Keysan, Ozan (2021-04-01)
A novel flat winding topology has been proposed as an alternative to conventional windings with stranded round wires and other bar wound windings. The proposed winding is manufactured from thin conductor sheets by industri...
A Low-Profile Autonomous Interface Circuit for Piezoelectric Micro-Power Generators
ÇİFTCİ, BERKAY; Chamanian, Salar; Koyuncuoglu, Aziz; Muhtaroglu, Ali; Külah, Haluk (2021-04-01)
This paper presents a low-profile and autonomous piezoelectric energy harvesting system consisting of an extraction rectifier and a maximum power point tracking (MPPT) circuit for powering portable electronics. Synchronize...
Low-frequency conductivity tensor imaging with a single current injection using DT-MREIT
Sadighi, Mehdi; Şişman, Mert; Acikgoz, Berk C.; Eroglu, Hasan H.; Eyüboğlu, Behçet Murat (2021-03-01)
Diffusion tensor-magnetic resonance electrical impedance tomography (DT-MREIT) is an imaging modality to obtain low-frequency anisotropic conductivity distribution employing diffusion tensor imaging and MREIT techniques. D...
Random Matrix Based Extended Target Tracking with Orientation: A New Model and Inference
Tuncer, Barkın; Özkan, Emre (2021-02-01)
In this study, we propose a novel extended target tracking algorithm which is capable of representing the extent of dynamic objects as an ellipsoid with a time-varying orientation angle. A diagonal positive semi-definite m...
Decorrelation of Previously Communicated Information for an Interacting Multiple Model Filter
Acar, Duygu; Orguner, Umut (2021-02-01)
In a sensor network compensation of the correlated information caused by previous communication is of utmost interest for distributed estimation. In this article, we investigate an information decorrelation approach that c...
A practical analysis of sample complexity for structure learning of discrete dynamic Bayesian networks
Geduk, Salih; Ulusoy, İlkay (2021-02-01)
Discrete Dynamic Bayesian Network (dDBN) is used in many challenging causal modelling applications, such as human brain connectivity, due to its multivariate, non-deterministic, and nonlinear capability. Since there is not...
Highly Sensitive and Tunable Fano-like Rod-Type Silicon Photonic Crystal Refractive Index Sensor
Kılıç, Selahattin Cem; Kocaman, Serdar (2021-01-01)
IEEEA highly sensitive and tunable 2D rod-type silicon photonic crystal cavity based biosensor configuration has been designed and numerically analyzed. The structure is optimized so that the light-matter interaction is ma...
Axial flux generator with novel flat wire for direct-drive wind turbines
Çakal, Gökhan; Keysan, Ozan (2021-01-01)
With the increased demand for renewable energy resources, the direct-drive wind turbine generators have been studied intensely in the last few decades. One megawatt direct-drive axial flux permanent magnet generator is pre...
A Stray Magnetic Flux-Based Robust Diagnosis Method for Detection and Location of Interturn Short Circuit Fault in PMSM
Gurusamy, Vigneshwaran; Bostancı, Emine; Li, Chen; Qi, Yuan; Akin, Bilal (Institute of Electrical and Electronics Engineers (IEEE), 2021-01-01)
© 1963-2012 IEEE.Early diagnosis of interturn short circuit (ITSC) fault is essential to prevent catastrophic electrical machine failures. Along with the detection, locating the faulty winding at its incipient stage is als...
Beamformer Design With Smooth Constraint-Free Approximation in Downlink Cloud Radio Access Networks
Kadan, Fehmi Emre; Yılmaz, Ali Özgür (2021-01-01)
It is known that data rates in standard cellular networks are limited due to inter-cell interference. An effective solution of this problem is to use the multi-cell cooperation idea. In Cloud Radio Access Network, which is...
Variational Measurement Update for Extended Object Tracking Using Gaussian Processes
Kumru, Murat; Koksal, Hilal; Özkan, Emre (2021-01-01)
We present an alternative inference framework for the Gaussian process-based extended object tracking (GPEOT) models. The method provides an approximate solution to the Bayesian filtering problem in GPEOT by relying on a n...
Layout Based Ultra-Fast Short-Circuit Protection Technique for Parallel Connected GaN HEMTs
Karakaya, Furkan; Alemdar, Öztürk Şahin; Keysan, Ozan (2021-01-01)
Gallium Nitride Enhancement-Mode High Electron Mobility Transistors (GaN HEMTs) help to achieve high power density converter circuits thanks to their superior efficiency, higher switching speed and small package size. Howe...
Three-Dimensional Extended Object Tracking and Shape Learning Using Gaussian Processes
Kumru, Murat; Özkan, Emre (2021-01-01)
Acceleration of MLFMA Simulations Using Trimmed Tree Structures
Karaosmanoglu, Bariscan; Ergül, Özgür Salih (2021-01-01)
We present a novel approach to accelerate the electromagnetic simulations by the multilevel fast multipole algorithm (MLFMA). The strategy is based on a progressive elimination of the electromagnetic interactions, resultin...
13.56 MHz Triple Mode Rectifier Circuit with Extended Coupling Range for Wirelessly Powered Implantable Medical Devices.
Engur, Yasemin; Yigit, Halil Andac; Külah, Haluk (Institute of Electrical and Electronics Engineers (IEEE), 2020-12-25)
In this work, a wide input/output range triple mode rectifier circuit operating at 13.56 MHz is implemented to power up medical implants. The proposed novel multi-mode rectifier circuit charges the load for an extended cou...
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