Elektronika ir Elektrotechnika (ELEKTRON ELEKTROTECH)

Journal description

Current impact factor: 0.45

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 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

Additional details

5-year impact 0.32
Cited half-life 2.70
Immediacy index 0.06
Eigenfactor 0.00
Article influence 0.02
ISSN 1392-1215

Publications in this journal

  • Elektronika ir Elektrotechnika 02/2015; 21(1):18-22. DOI:10.5755/j01.eee.21.1.5223
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    ABSTRACT: The performance of a robotic arm includes accuracy, repeatability and reliability to accomplish a task. These parameters, in turn, are function of associated control law. Multi-Degree Of Freedom (DOF) robotic arms, because of their inherent highly non-linear dynamics, demand sophisticated control laws. Trivial control strategies fail to cope with disturbances and uncertainties that are common in today’s plants. This paper presents the design, simulation and physical implementation of a non-linear control technique Variable Structure Control (VSC) for a 6 DOF arm. Based on the derived dynamic model of the arm and designed control law, simulations have been conducted in MATLAB/Simulink. The controller parameters have been tuned for optimal response. Various desired trajectories characterize the tracking performance of the control law. The simulation results have been then validated by implementing the law on a custom-developed novel AUTonomous Articulated Robotic Educational Platform (AUTAREP). Coupling effects between various joints of the robot have also been investigated. Results of this research find potential in industrial control of robotic manipulators to perform complex tasks.
    Elektronika ir Elektrotechnika 01/2015;
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    ABSTRACT: Today we see various small automated devices that are used to regulate the energy consumption in households. Most of these devices work autonomously on a specific set of appliances or only for specific necessities, such as heating or cooling. The proposed smart energy solutions are focused on gathering datasets of the historical data for energy consumption and then propose different algorithms for analysing these datasets. In this paper, we investigate the possibility of using a new Smart-ECO model, consisting of a smart device running its own smart algorithm. We will conduct analysis on real-time household dataset, in order to optimize the electricity consumption per appliance. The proposed model is based on the custom preferences and behavioural habits of the people that live in the household and the inter-dependency of the appliances that are active at the moment.
    Elektronika ir Elektrotechnika 01/2015;
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    ABSTRACT: The next generation mobile networks LTE and LTE-A are all-IP based networks. In such IP based networks, the issue of Quality of Service (QoS) is becoming more and more critical with the increase in network size and heterogeneity. In this paper, a Reinforcement Learning (RL) based framework for QoS enhancement is proposed. The framework achieves the coverage/capacity optimization by adjusting the scheduling strategy. The proposed self optimization algorithm uses coverage/capacity compromise in Packet Scheduling (PS) to maximize the capacity of an eNB subject to the condition that minimum coverage constraint is not violated. Each eNB has an associated agent that dynamically changes the scheduling parameter value of an eNB. The agent uses the RL technique of Fuzzy Q-Learning (FQL) to learn the optimal scheduling parameter. The learning framework is designed to operate in an environment with varying traffic, user positions, and propagation conditions. A comprehensive analysis on the obtained simulation results is presented, which shows that the proposed approach can significantly improve the network coverage as well as capacity in terms of throughput.
    Elektronika ir Elektrotechnika 11/2014; 20(9):59-64. DOI:10.5755/j01.eee.20.9.4786
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    ABSTRACT: The objective in this paper was to combine the simulation of a Gas Metal Arc Welding (GMAW) process model with the simulation model of an inverter-based power machine. The GMAW process was considered as an electrical circuit and the mathematical model was based on physical descriptions of several parts of the GMAW process, as were the electric circuit of the power supply, the arc dynamics, and the electrode melting process. A simple welding application was simulated and the welding parameters were derived from several experimental conditions. Next, the dynamic behaviour of a full-bridge DC-DC converter was simulated and a suitable discrete PI controller proposed for welding current feedback control. Both models, the GMAW model and the inverter power supply model, were combined into a new simulation model of the GMAW process application together with an inverter based welding machine.
    Elektronika ir Elektrotechnika 10/2014; 20(7):3-6. DOI:10.5755/j01.eee.20.7.8016
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    ABSTRACT: In this paper, a coded M-ary pulse position modulation (PPM) scheme for transmitted reference ultra- wideband (TR-UWB) systems is proposed. In conventional M- ary PPM TR-UWB scheme, modulation level M is defined only with a number of possible pulse positions Z. So, Z radio frequency (RF) wideband delay lines are required in order to map data bits into the proper pulse position, which makes such system very impractical to implement when the current CMOS technology is used. In the proposed scheme the number of required delay lines is reduced by mapping data bits in both, pulse position and K different orthogonal codes on frame level of the signal, producing a modulation level of M = KZ. To evaluate the performances of the proposed coded M-ary PPM scheme, the analytical model for realistic IEEE standard UWB channel models is developed. The performances of the proposed scheme are compared with these of the conventional M-ary PPM scheme for the same modulation level M. The results show that the proposed coded M-ary PPM scheme achieves approximately the same bit error probability (BEP), higher data rate and higher bandwidth efficiency, while the hardware complexity is lower in terms of number of required RF delay lines. However, by increasing the number of used orthogonal codes the minimum number of frames per one information symbol rises and consequently the maximum achievable data rate is limited. Thus the trade-off between the number of orthogonal codes and target data rate should be made.
    Elektronika ir Elektrotechnika 09/2014; DOI:10.5755/j01.eee.20.10.6797
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    ABSTRACT: In this paper, we propose new scheme for an optimum location for Relay Node (RN) in LTE-A celular network to enhance the capacity at cel edge based on modified Shanon capacity for LTE networks. The proposed aproach mitigates interferences betwen the nodes and ensures optimum utilzation of transmited power. In adition, this papers the mathematical derivation of optimal number of RNs per cel to prevent the overlaping betwen neighbouring RNs meanwhile providing the best coverage. Mathematical results are validated by Simulation results and indicate an improvement in capacity for users at the cel edge from 0.6 b/s/Hz to 1.45 b/s/Hz and 40% increment from al cel capacity. Moreover, a gain about 8 dBm and 25 dBm is observed for users at the cel edge for uplink and downlink in the received signal respectively. It has ben concluded from the numerical analysis which is conducted on limited interferences for al nodes (in-band and out-band) provides simplicity and ease in implementation by the RF planing designers.
    Elektronika ir Elektrotechnika 07/2014; 20(7):73-79. DOI:10.575/j01.ee.20.7.379