Darius Plonis

Darius Plonis
Vilnius Gediminas Technical University | VGTU · Department of Electronic Systems

13.37
 · 
PhD
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36
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1,325
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39
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Introduction
Darius Plonis currently works at the Department of Electronic Systems, Vilnius Gediminas Technical University. Darius does research in Engineering Physics, Telecommunications Engineering and Electronic Engineering.
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Research items (36)
Article
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Models of gyroelectric GaAs waveguides with temperature sensitive anisotropic dielectric layer are presented in this paper. The influence of density of free carriers and temperature to the EM waves attenuation of gyroelectric n and p GaAs waveguides is evaluated. Differential Maxwell's equations, coupled mode and partial area methods, coherent appr...
Article
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This study presents calculation of dispersion characteristics in the frequency range 1–100 GHz as well as electric field distributions in an open cylindrical waveguide with a central channel. The waveguide is made of glass material. The channel can be either empty or filled with blood plasma or blood cells. We investigated two kinds of electromagne...
Article
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Here is presented our numerical investigations based on the rigorous solution of the Maxwell’s equations for analyses of absorbed and scattered powers of a semiconductor-metamaterial array with a window defect. The array structure consists of a finite set of infinite parallel, circular cylinders that can be made of the different lossy and/or lossle...
Article
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The process of designing microwave devices is difficult and time-consuming because the analytical and numerical methods used in the design process are complex. Therefore, it is necessary to search for new methods that will allow for an acceleration of synthesis and analytic procedures. This is especially important in cases where the procedures of s...
Article
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Models of open cylindrical multilayer gyroelectric-anisotropic-gyroelectric waveguides are presented in this paper. The influence of density of free carriers, temperature and the presence of the external dielectric layer on the wave phase characteristics of the models of n -GaAs waveguides has been evaluated. Differential Maxwell’s equations, coupl...
Article
The investigation aimed at the evaluation of EEG activity during stereoscopic perception of images with different levels of visual comfort. Different levels of disparity and the number of details in stereoscopic views in some cases make it difficult to find the focus point for comfortable depth perception quickly. During our investigation, we found...
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The investigation aimed at the evaluation of EEG activity during stereoscopic perception of images with different levels of visual comfort. Different levels of disparity and the number of details in stereoscopic views in some cases make it difficult to find the focus point for comfortable depth perception quickly. During our investigation, we found...
Article
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The aim of this paper is to accelerate development and investigation of the delay systems. The computational time for investigation of particular design of delay system may take from several minutes up to several days. To achieve the required constructional parameters of the system, the iterative calculations usually should be repeated many times....
Article
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The aim of the investigation presented in this paper was to develop a software-based assistant for the protein analysis workflow. The prior characterization of the unknown protein in two-dimensional electrophoresis gel images is performed according to the molecular weight and isoelectric point of each protein spot estimated from the gel image befor...
Article
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With the rapid advances in technology of mobile devices, their application areas expand continuously as well. Given the growth of the market share for mobile devices, one of the main issues that arise is the need for new and convenient techniques for data input and output suitable for various settings. Tilt-based text input is one of the alternativ...
Article
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The algorithm of parametric synthesis of meander slow-wave system with additional shields is presented in this paper. The influence of main constructive parameters of meander slow-wave system with additional shields on its electrical characteristics was evaluated in order to achieve the optimal results of the synthesis. Verification of the algorith...
Article
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Constructions of meander slow-wave systems with additional shields grounded at different positions are presented. The construction of meander slow-wave systems with additional shields grounded at both edges is investigated in detail. The influence of the main constructive parameters on the electrical characteristics of meander slow-wave systems wit...
Conference Paper
Gyroelectric n and p type's waveguides were usually investigated using differential Maxwell's equations, coupled mode and partial area methods, coherent approaching, least square methods. Computation time of one particular model of this type of waveguide might take quite a long time and even to a couple of days using one of these analytical methods...
Conference Paper
Introduction: With the rapid evolution of mobile devices, there is also a tremendous growth in their applications. This triggers new research on more efficient techniques of humancomputer interaction. To point at an object of interest seen on the screen of a mobile device, various new methods were suggested recently. Methods: This paper presents th...
Article
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The aim of this paper was to introduce the estimation of the losses in the prototypes of the microwave devices. We proposed in this paper two algorithms: an algorithm for evaluation of losses in the microwave devices based on a waveguide and an algorithm for evaluation of losses in the microwave devices based on a meander line. In order to verify t...
Article
The use of semiconductor-dielectric waveguides is low at the moment due to disadvantage of high attenuation of electromagnetic microwaves. The attenuation depends on structures and materials of semiconductor-dielectric waveguides. Dependences of transmission coefficient on the frequency of semiconductor-dielectric waveguides and on different densit...
Article
Recently, live video streaming from hand- held devices entered mass market. Ordinary video conference systems were supplemented with additional features, such as marking in order to point attention of the conference participants on specific object in the video. However, the accuracy of live video marking depends on the video latency, received betwe...
Conference Paper
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Paper presents a new algorithm proposed to dynamically adapt jitter buffer, used in video transcoding applications. When the video content provider is moving continuously, the wireless network connectivity conditions changes in time. The resulting jitter should be compensated in video transcoder by selecting jitter buffer high enough to compensate...
Article
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In this paper the open, circular cross-section cylindrical gyro- electric p-GaAs (semiconductor-dielectric) waveguides with temperature-sensitive anisotropic dielectric layer are investigated. The gyroelectric phase shifters without anisotropic dielectric layer are not effective. The anisotropic layer increases the mode HE11 differential phase shif...
Article
In this paper the open, circular cross-section cylindrical gyro- electric p-GaAs (semiconductor-dielectric) waveguides with temperature-sensitive anisotropic dielectric layer are investigated. The gyroelectric phase shifters without anisotropic dielectric layer are not effective. The anisotropic layer increases the mode HE11 differential phase shif...
Article
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V. Malisauskas, D. Plonis. The Investigation of Gyroelectric n-InAs Phase Shifters Characteristics // Electronics and Electrical Engineering. - Kaunas: Technologija, 2012. - No. 6(122). - P. 121-124. In this paper the open cylindrical gyroelectric phase shifters characteristics are investigated. The investigation is performed by changing their para...
Article
Using analytical iterative methods, simulation of microwave devices is complicated: computing time is relatively long, sophisticated models are used for simulations. Possibilities to improve simulation process were discovered using the method based on artificial neural networks. An example of the algorithm, which allows the transition from iterativ...
Article
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This paper focuses on the analysis technique of gyrotropic circular cylindrical semiconductor waveguide by the use of an electrodynamical model. Authors propose the semi-automatic extraction of the dispersion characteristics by the use of single-layer perceptron neural network. The waveguide analysis algorithm consists of four main stages: initiali...
Conference Paper
The paper addresses the problem of the cylindrical gyrotropic waveguide analysis by an electrodynamical model. The technique of semi-automatic extraction of the dispersion characteristics by the use of single-layer perceptron neural network is proposed. Presented waveguide analysis algorithm is divided in four stages: initialisation of system param...
Article
The paper addresses the problem of the cylindrical gyrotropic waveguide analysis by an electrodynamical model. The technique of semi-automatic extraction of the dispersion characteristics by the use of single-layer perceptron neural network is proposed. Presented waveguide analysis algorithm is divided in four stages: initialisation of system param...
Article
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In the present work the dispersive dependences of cylindrical n-Si rod waveguides are analyzed at two specific resistivity of a semi-conductor material (0.3ωm,300) and at two waveguide radii (0.25 mm, 1 mm) for the basic HEm,11300mHE11 and the first higher EH11 hybrid modes. Muller's method has been used for complex roots' searching of the dispersi...
Article
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Presented general electrodynamical and mathematical model of the open cylindrical round cross-section gyroelectric semiconductor waveguides. Created general algorithm and program in MATLAB® for calculations dispersion characteristics of the propagation wave's in the waveguides. Are investigated characteristics of the waves HE11, EH11 and HE12 in 0....