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Recent Submissions

SNR and total acquisition time analysis of multi-echo FLASH pulse sequence for current density imaging
Sadighi, Mehdi; Şişman, Mert; Eyüboğlu, Behçet Murat (2021-12-01)
Magnetic Resonance Current Density Imaging (MRCDI) is an imaging modality providing cross-sectionalcurrent densityðJ Þinformation inside the body. The clinical applicability of MRCDI is highly dependenton the sensitivity o...
A partitioning strategy for improved state estimation performance in ill-conditioned power systems with hybrid measurement set
Yildiz, Tuna; Açılan, Etki; Göl, Murat (2021-12-01)
Considering the increase in power system size and the number of PMUs, the utilization of a computationally efficient yet accurate static state estimator is crucial. The fast-decoupled WLS estimator (FD-WLS) is the most com...
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...
Dual Band, Miniaturized Permittivity Measurement Sensor With Negative-Order SIW Resonator
Mohammadi, Pejman; Teimouri, Hadi; Mohammadi, Ali; Demir, Şimşek; KARA, ALİ (2021-10-01)
A novel dual band, highly sensitive Substrate Integrated Waveguide (SIW) sensor for permittivity measurements is presented. A pair of modified Complementary Split Ring Resonators (CSRRs) is etched on SIW surface. CSRRs are...
A Bound Based Method for Beamformer Design in Downlink Cloud Radio Access Networks
Kadan, Fehmi Emre; Yılmaz, Ali Özgür (2021-10-01)
Cloud Radio Access Network is a candidate solution in 5G and beyond where we intend to serve as many users as possible with minimum transmit power and minimum fronthaul data transmission. In this study, we aim to maximize ...
An Efficient QAM Detector via Nonlinear Post-Distortion Based on FDE Bank Under PA Impairments
Salman, Murat Babek; Güvensen, Gökhan Muzaffer (2021-10-01)
In this paper, we propose a receiver structure for single-carrier uplink transmission with frequency domain equalization (FDE) that is exposed to power amplifier (PA) nonlinearities. A two-stage approach is adopted, in whi...
Parallel connected GaN E-HEMT VSI-based servo drives for PMSMs
Yuruk, Huseyin; Keysan, Ozan (2021-09-01)
The operation of parallel-connected servo drives has the advantages of increasing the torque (hence the power) capacity, reliability, redundancy and modularity. However, smaller discrepancies of the system clocks of the in...
Linear optical deterministic and reconfigurable SWAP gate
Bozkurt, Alkim B.; Kocaman, Serdar (2021-09-01)
We propose a deterministic SWAP gate for dual-rail-encoded single photon qubits. The gate is constructed from waveguide crossings, Mach-Zehnder interferometers and phase shifters which provide the gate reconfigurability. T...
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...
Harmonic synchronization under all three types of coupling: Position, velocity, and acceleration
Tuna, Sezai Emre (2021-08-01)
Synchronization of identical harmonic oscillators interconnected via position, velocity, and acceleration couplings is studied. How to construct a complex Laplacian matrix representing the overall coupling is presented. It...
Giriş Kısıtlı Ters Sarkaç Mekanizmasının Optimal Kontrolü
SOVUKLUK, Sait; Ankaralı, Mustafa Mert (2021-08-01)
Rapid developments in today's actuator and sensor technologies have pioneered the development of platforms containing very different actuator and sensor combinations. In order to utilize the potentials of the platforms in ...
Frequency estimation of a single real-valued sinusoid: An invariant function approach
Candan, Çağatay; Çelebi, Utku (2021-08-01)
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 estimation problem. Th...
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...
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...
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...
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...
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