Elektronika ir Elektrotechnika (ELEKTRON ELEKTROTECH)

Current impact factor: 0.56

Impact Factor Rankings

2016 Impact Factor Available summer 2017
2014 / 2015 Impact Factor 0.561
2013 Impact Factor 0.445
2012 Impact Factor 0.411
2011 Impact Factor 0.913
2010 Impact Factor 0.659
2009 Impact Factor 0.439

Impact factor over time

Impact factor
Year

Additional details

5-year impact 0.36
Cited half-life 2.70
Immediacy index 0.13
Eigenfactor 0.00
Article influence 0.05
ISSN 1392-1215

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper deals with distributed measurements in power electrical engineering. The word "distributed" means that the measurement is carried out simultaneously in different locations. Distance between these locations can be tens of kilometers or more. For a long time, the authors have been performing electrical measurements in electric traction, especially in electrified railways. Due to the extensiveness of the railway network, it is very important to find the solution of this problem. After a thorough examination of the subject, the authors have developed computer based measuring apparatuses and GPS based synchronizers. This paper describes the creation of the GPS synchronizer as well as a post-processing data synchronization method. The concluding part includes an example of this apparatus being practically used while carrying out measurements in a railway traction transformer substation and on track circuits. Some interesting measurement results, as well as their analysis, are also presented here.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: Calibration is an important step of 3D structured light laser scanners to be able to obtain an accurate measuring result. During the calibration a relation between the pixels in 3D laser scanner camera image and the real world units is made. Laser line detection method as part of the calibration process plays an important role in this calibration process, but this aspect has not been investigated before. In this paper the calibration and measurement result dependency from the laser line detection with pixel or sub-pixel resolution in the calibration process has been investigated. The calibration process of the developed 3D laser scanner has been described. The results show dependency between the laser line detection method in the calibration process and the final measurement results.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: In this paper an analysis of implementation alternatives of smart electrical power sockets is presented. Smart socket (SSoc) functionality include power measurement, wireless connectivity, and load control. Power measurement uncertainty is defined by SSoc design and calibration. We investigate influence of voltage and current waveforms quantization errors and influence of Hall current sensor noise upon the active power measurement uncertainty. Voltage and current measurement module is calibrated by estimating corresponding gain factors using reference power analyser. Then calibration errors influence upon power measurement errors is studied. SSoc internal power dissipation is analysed by means of alternative power supply modules prototyping.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: A C-shaped patches loaded with dipole antenna designed for multiband antenna is proposed. The antenna can be reconfigured as single band at 1.2275 GHz for GPS applications and dual-band frequencies at UHF band (850 MHz-930 MHz) and ISM band (2.41 GHz-2.54 GHz) required in RFID applications. The performance of the antenna involves changing the switches to ON or OFF mode by controlling switches. By adjusting the dimension of C-shaped patch, a dual-band frequency of 0.89 GHz and 2.46 GHz is performed. The antenna's gains are 2 dBi and 3.2 dBi for lower and upper bands respectively. The length slot and length of Cshaped patch can be varied to adjust the desired upper frequency as well as the bandwidth. Moreover, the lower frequency can be tuned by varying the dipole arms for both elements. Nevertheless, the dipole antenna operated as single band when the switches are OFF at frequency resonance is 1.2275 GHz with 2.06 dBi of gain. The total efficiency for single and dual band is greater than 90 %. The design methodology and antenna measurement results are both presented and discussed in this paper.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: This paper describes a prospective design concept of a hard switching input voltage stabilizer for the auxiliary drives converters of dc catenary fed light traction vehicles. Auxiliary drives are mostly dedicated to generate standard power grid that supplies various on-board equipment and charging on-board batteries. The input voltage stabilizer (IVS) is the first input block of auxiliary drives. This block defines the voltage level of the consequent dc/dc isolated converter (IC). The main aim of this paper is to present the reader with the design of a low-cost variant of the voltage stabilizer. The described input voltage stabilizer is designed as a buck (step-down) or boost (step-up) converter, operating with an input catenary voltage range of 400 (VDC) to 950 VDC. The new fast, discrete IGBT H3 transistors and SiC diodes allow switching frequency from 20 kHz to 30 kHz in a hard switching mode with power rated up to 22 kW.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: Resonant converters can operate at high switching frequencies with low switching losses. However, in order to reduce switching losses resonant frequency has an important role in the design. In this study, a DSP based closed loop phase locked loop (PLL) control algorithm for parallel resonant inverter is designed and simulated with MATLAB/Simulink. The validity of the Simulink model of current source inverter is tested for different loads and gain values obtained from Jury's stability. The developed DSP controlled parallel resonant inverter tracks the resonant frequency and achieves soft switching.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: Spectrum sensing task is known to be one of the most important functionalities of a cognitive radio for dynamic spectrum access networks to be aware of the radio environment. Licensed user (primary user) detection has gained a great deal of interest recently on spectrum sensing strategies whereas unlicensed user (secondary user) detection must be a part of sensing with equal proportion of interest. This paper proposes a novel scheme that enables an efficient and robust spectrum sensing for both primary and secondary users detection. The proposed scheme is based on intentionally adding known noise at the sensing side. Then the sensing detector becomes insensitive to signal and noise types, and thus noise uncertainty problem is diminished. After sensing, the added noise is removed without affecting existing transmission on the channel. Although there have been several spectrum sensing methods, the proposed scheme is the optimal solution for spectrum sensing, to the best of our knowledge.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: This paper examines the LTE UE (Long-Term Evolution User Equipment) in 800 MHz frequency band (the so-called digital dividend) interference to Short Range Devices (SRD) in the band of 863 MHz-870 MHz. The fundamental objective of this research is to evaluate the probability of interference and influence of LTE UE emission mask in this regards. The study was performed in two methods: theoretical - simulations with SEAMCAT software and practical - measurements to verify gathered results in simulations. The results of this paper characterize the required technical conditions for LTE mobile networks deployment in 800 MHz band.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: The paper presents a novel extension of the Huang's Empirical Mode Decomposition (EMD) method, called BoostEMD, that allows calculating higher order Intrinsic Mode Functions (IMFs) that capture higher frequency empirical mode oscillations (empiquencies) in the EMG (electromyography) data. We describe the use of the second order IMFs for denoising physical action EMG signals. We demonstrate the efficiency of denoising by performing classification of EMG data before and after application of the denoising procedure as well as by evaluating properties of the extracted noise signal.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: Photovoltaic (PV) systems produce a significant amount of electrical energy used around the world. The performance of a PV array is affected by temperature, solar insolation, shading and array configuration. Obtainable maximum power generation from PV based energy production systems is only possible with Maximum Power Point Tracking (MPPT) methods. In order to maximize the efficiency of PV energy conversion systems, solar panels and arrays should be operated at maximum power points. At maximum power point, solar arrays generate the electric energy at maximum efficiency and minimum losses. This paper discusses the following issues: (1) what is the effect of MPPT unit in PV systems, (2) two connection methods between solar arrays and buck-boost DC/DC converter with MPPT unit, (3) determine behaviours of PV power generation systems in cloudy and sunny conditions.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: This paper presented a possible application of a digital image quality measure, called the Universal Quality Image Index Q, for the diagnostics of the eye fundus. The proposed method supports examination of the progression of macular degeneration allowing to reduce the number of errors during a subjective examination by an ophthalmologist. This occurs mostly when changes are small between successive examinations. This paper proposes an effective algorithm to eliminate the errors during the subjective assessment caused by inaccurate synchronization of examined images.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika
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    ABSTRACT: This letter proposes an effective pre-processing technique for robust estimation of signal parameters via rotational invariance techniques (ESPRIT)-based single-tone frequency estimation against an I/Q mismatch. For the implementation of a high-accuracy ranging/radar system, parametric-based algorithms such as MUSIC, ESPRIT and their variations have been adopted due to their superior estimation capability for single-tone frequency estimations. Since most ranging/radar system have the direct conversion architecture, I/Q imbalance problem occurs in the form of spurious frequencies of the frequency spectrum. For this reason, the proposed pre-processing technique is designed to make use of the Hilbert transform structure for received signals. The estimation performance of the proposed pre-processing technique in single-tone frequency is derived and compared with the results from a Monte-Carlo simulation. The root-mean-square error (RMSE) of the proposed method is compared with that of an ESPRIT-based method for various parameters.
    No preview · Article · Dec 2015 · Elektronika ir Elektrotechnika