Department of Electrical and Electronics Engineering
Recent Submissions
-
Data from: Performance of compressed sensing based image reconstruction for photoacoustic imaging
(Bilkent University, 2022-08) -
Ultrasonic array characterization in multiscattering and attenuating media using pin targets
(Cornell University, 2021-05-31)This paper presents an approach to characterize ultrasonic imaging arrays using pin targets in commercial test phantoms. We used a 128-element phased array transducer operating at 7.5 MHz with a fractional bandwidth of ... -
Coded divergent waves for fast ultrasonic imaging: Optimization and comparative performance analysis
(Cornell University, 2021-04-21)In this paper, we present the optimal use of coded signals in diverging wave transmission for fast ultrasonic imaging. The performance of coded imaging with diverging waves, quantified by SNR, CNR, speckle power and target ... -
Signal-to-noise ratio of diverging waves in multiscattering media: Effects of signal duration and divergence angle
(AIP Publishing, 2022-01-18)In this paper, SNR maximization in coded diverging waves is studied, and experimental verification of the results is presented. Complementary Golay sequences and binary phase shift keying modulation are used to code the ... -
Steady-state and first passage time distributions for waiting times in the MAP/M/s+G queueing model with generally distributed patience times
(AIMS Press, 2021)We study the MAP/M/s+G queueing model that arises in various multi-server engineering problems including telephone call centers, under the assumption of MAP (Markovian Arrival Process) arrivals, exponentially distributed ... -
Exceptional adaptable MWIR thermal emission for ordinary objects covered with thin VO2 film
(Elsevier Ltd, 2021-01-25)Monotonous thermal radiation emitted from an ordinary object can be brought into a dynamic and versatile form that can be shaped according to the application area with the ingenious design of the surface coatings. Building ... -
Adaptive measurement matrix design in compressed sensing based direction of arrival estimation
(IEEE, 2021)Design of measurement matrices is an important aspect of compressed sensing (CS) based direction of arrival (DoA) applications that enables reduction in the analog channels to be processed in sparse target environments. ... -
Combinatorial Gaussian process bandits with probabilistically triggered arms
(Microtome Publishing, 2021)Combinatorial bandit models and algorithms are used in many sequential decision-making tasks ranging from item list recommendation to influence maximization. Typical algorithms proposed for combinatorial bandits, including ... -
The pulse shape effect on signal-to-noise ratio for φ-OTDR systems
(Optica Publishing Group, 2021)We experimentally investigate the effect of the probe pulse shape on the performance of φ-OTDR based distributed vibration sensors by comparing the SNR values for rectangular, Gaussian and triangular pulses. -
Spatial resolution analysis of dual-pulse ϕ-OTDR systems
(Optica Publishing Group, 2021)This work analyzes the spatial resolution of the dual-pulse -OTDR systems by changing the dual-pulse parameters and demonstrates that the spatial resolution corresponds to half of the fiber region occupied by the dual-pulse train. -
State of the art and prospects for Halide Perovskite nanocrystals
(American Chemical Society, 2021-06-17)Metal-halide perovskites have rapidly emerged as one of the most promising materials of the 21st century, with many exciting properties and great potential for a broad range of applications, from photovoltaics to optoelectronics ... -
Spatiotemporal sequence prediction with point processes and self-organizing decision trees
(Institute of Electrical and Electronics Engineers, 2021-09-22)We study the spatiotemporal prediction problem and introduce a novel point-process-based prediction algorithm. Spatiotemporal prediction is extensively studied in machine learning literature due to its critical real-life ... -
Multi-label sentiment analysis on 100 languages with dynamic weighting for label imbalance
(Institute of Electrical and Electronics Engineers, 2021-07-19)We investigate cross-lingual sentiment analysis, which has attracted significant attention due to its applications in various areas including market research, politics, and social sciences. In particular, we introduce a ... -
Achieving online regression performance of LSTMs with simple RNNs
(Institute of Electrical and Electronics Engineers, 2021-06-17)Recurrent neural networks (RNNs) are widely used for online regression due to their ability to generalize nonlinear temporal dependencies. As an RNN model, long short-term memory networks (LSTMs) are commonly preferred in ... -
Markovian RNN: an adaptive time series prediction network with HMM-based switching for nonstationary environments
(Institute of Electrical and Electronics Engineers, 2021-08-09)We investigate nonlinear regression for nonstationary sequential data. In most real-life applications such as business domains including finance, retail, energy, and economy, time series data exhibit nonstationarity due ... -
Single-mode lasing from a single 7 nm thick monolayer of colloidal quantum wells in a monolithic microcavity
(Wiley-VCH Verlag, 2021-03-03)In this work, monolithically-fabricated vertical cavity surface emitting lasers (VCSELs) of densely-packed, orientation-controlled, atomically flat colloidal quantum wells (CQWs) using a self-assembly method is reported ... -
Deep-red-emitting colloidal quantum well light-emitting diodes enabled through a complex design of core/crown/double shell heterostructure
(Wiley-VCH Verlag GmbH & Co. KGaA, 2021-12-10)Extending the emission peak wavelength of quasi-2D colloidal quantum wells has been an important quest to fully exploit the potential of these materials, which has not been possible due to the complications arising from ... -
Near-field energy transfer into silicon inversely proportional to distance using quasi-2D colloidal quantum well donors
(Wiley-VCH Verlag GmbH & Co. KGaA, 2021-09-12)Silicon is the most prevalent material system for light-harvesting applications; however, its inherent indirect bandgap and consequent weak absorption limits its potential in optoelectronics. This paper proposes to address ... -
Opinion dynamics of stubborn agents under the presence of a troll as differential game
(Scientific and Technical Research Council of Turkey - TUBITAK,Turkiye Bilimsel ve Teknik Arastirma Kurumu, 2021-11-30)The question of whether opinions of stubborn agents result in Nash equilibrium under the presence of troll is investigated in this study. The opinion dynamics is modelled as a differential game played by n agents during a ...
RSS 1.0