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Recent Submissions

Metric scale and angle estimation in monocular visual odometry with multiple distance sensors
Ölmez, Burhan; Tuncer, Temel Engin (2021-10-01)
© 2021 Elsevier Inc.In this paper, a novel approach is presented to estimate the metric scale (MSC) and roll and pitch angles of a platform by using distance sensors in a monocular visual odometry setup. A state-of-the-art...
Maximum likelihood autoregressive model parameter estimation with noise corrupted independent snapshots
ÇAYIR, ÖMER; Candan, Çağatay (2021-09-01)
© 2021 Elsevier B.V.Maximum likelihood autoregressive (AR) model parameter estimation problem with independent snapshots observed under white Gaussian measurement noise is studied. In addition to the AR model parameters, t...
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...
Harmonic synchronization under all three types of coupling: Position, velocity, and acceleration
Tuna, Sezai Emre (2021-08-01)
© 2021 Elsevier LtdSynchronization of identical harmonic oscillators interconnected via position, velocity, and acceleration couplings is studied. How to construct a complex Laplacian matrix representing the overall coupli...
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...
Estimation of partially occluded 2D human joints with a Bayesian approach
Dursun, Ahmet Anıl; Tuncer, Temel Engin (2021-07-01)
© 2021 Elsevier Inc.Human pose estimation is an important problem which has found applications in different fields. One problem in this context is to estimate the human joints or keypoints under occlusion. Most of the meth...
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...
Feasibility of quasi-square-wave zero-voltage-switching bi-directional dc/dc converters with gan hemts
Karakaya, Furkan; Gülsuna, Özgür; Keysan, Ozan (2021-05-02)
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.There are trade-offs for each power converter design which are mainly dictated by the switching component and passive component ratings. Recent power electronic devi...
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...
Proper Definition and Handling of Dirac Delta Functions [Lecture Notes]
Candan, Çağatay (2021-05-01)
Analysis of Slotted ALOHA With an Age Threshold
Yavascan, Orhan Tahir; Uysal, Elif (2021-05-01)
We present a comprehensive steady-state analysis of threshold-ALOHA, a distributed age-aware modification of slotted ALOHA proposed in recent literature. In threshold-ALOHA, each terminal suspends its transmissions until t...
Switched reluctance motors and drive systems for electric vehicle powertrains: State of the art analysis and future trends
Lan, Yuanfeng; Benomar, Yassine; Deepak, Kritika; AKSÖZ, AHMET; Baghdadi, Mohamed El; Bostancı, Emine; Hegazy, Omar (2021-04-02)
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.This paper presents a detailed literature review on switched reluctance motor (SRM) and drive systems in electric vehicle (EV) powertrains. SRMs have received increa...
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...
A Comparison of Velocity Skin Effect Modeling With 2-D Transient and 3-D Quasi-Transient Finite Element Methods
Tosun, Nail; Ceylan, Doga; Polat, Hakan; Keysan, Ozan (2021-04-01)
The analysis of the velocity skin effect (VSE) in electromagnetic launchers (EMLs) requires a 3-D transient finite element method, unlike magnetic skin and proximity effects. However, VSE is dominant at high speeds, and th...
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...
CHAOS Challenge- combined (CT-MR) healthy abdominal organ segmentation
Kavur, A. Emre; et. al. (2021-04-01)
Segmentation of abdominal organs has been a comprehensive, yet unresolved, research field for many years. In the last decade, intensive developments in deep learning (DL) introduced new state-of-the-art segmentation system...
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...
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...
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...
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