2024-03-29T14:55:13Z
http://ijet.pl/index.php/ijet/oai
oai:ojs.ijet.ise.pw.edu.pl:article/1712
2019-09-01T21:32:26Z
ijet:EMC
"190901 2019 eng "
2300-1933
dc
The analytical and artificial intelligence methods to investigate the effects of aperture dimension ratio on electrical shielding effectiveness
BASYIGIT, İbrahim Bahadir
http://orcid.org/0000-0003-4558-5068
DOĞAN, Habib
http://orcid.org/0000-0001-8685-9569
This paper presents that the effect of single aperture size of metallic enclosure on electrical shielding effectiveness (ESE) at 0 – 1 GHz frequency range has been investigated by using both Robinson’s analytical formulation and artificial neural networks (ANN) methods that are multilayer perceptron (MLP) networks and a radial basis function neural network (RBFNN). All results including measurement have been compared each other in terms of aperture geometry of metallic enclosure. The geometry of single aperture varies from square to rectangular shape while the open area of aperture is fixed. It has been observed that network structure of MLP 3-40-1 in modeling with ANN modeled with fewer neurons in the sense of overlapping of faults and data and modeled accordingly. In contrast, the RBFNN 3-150-1 is the other detection that the network structure is modeled with more neurons and more. It can be seen from the same network-structured MLP and RBFNN that the MLP modeled better. In this paper, the impact of dimension of rectangular aperture on shielding performance by using RBFNN and MLP network model with ANN has been studied, as a novelty.
Electronics and Telecommunications Committee
2019-09-01 20:17:28
application/pdf
http://ijet.pl/index.php/ijet/article/view/10.24425-ijet.2019.126322
International Journal of Electronics and Telecommunications; Vol 65, No 3 (2019)
eng
Copyright (c) 2019 International Journal of Electronics and Telecommunications
oai:ojs.ijet.ise.pw.edu.pl:article/2516
2020-09-10T21:07:47Z
ijet:EMC
"200907 2020 eng "
2300-1933
dc
Impact of IT equipment location in buildings on electromagnetic safety
Nowosielski, Leszek
Military University of Technology
ul. Gen. S. Kaliskiego 2, 00-908 Warsaw, Poland http://orcid.org/0000-0002-4230-4905
Electronics; electromagnetic compatibility
The attenuation of the signal introduced by the propagation path between the source of the compromising emanation (the location of secured IT equipment) and the location of the antenna of the potential infiltrating system has a direct influence on the electromagnetic safety of IT equipment. The article presents original analytical relationships necessary to estimate the attenuation values introduced by the propagation path of the potential compromising emanation signal, which correspond to the most probable locations of IT equipment in relation to the location of the potential infiltrating system. The article analyzes identified by the author various location scenarios for IT equipment, which is a potential source of compromising emanation, with a potential infiltrating system positioned inside or outside the building, in which said IT equipment is located. The aforementioned scenarios are characterized by the lowest attenuation of the propagation path of potential compromising emanation generated by the secured IT equipment and provide for location masking of the potential infiltrating system. Example design of protective solutions for IT equipment elaborated by article author in the form of a shielding enclosure is presented in the article too.
Electronics and Telecommunications Committee
2020-09-07 19:51:59
application/pdf
http://ijet.pl/index.php/ijet/article/view/10.24425-ijet.2020.134002
International Journal of Electronics and Telecommunications; Vol 66, No 3 (2020)
eng
http://ijet.pl/index.php/ijet/article/download/2516/7320
http://ijet.pl/index.php/ijet/article/download/2516/7322
http://ijet.pl/index.php/ijet/article/download/2516/0
http://ijet.pl/index.php/ijet/article/download/2516/7450
Copyright (c) 2020 International Journal of Electronics and Telecommunications
oai:ojs.ijet.ise.pw.edu.pl:article/622
2016-09-08T11:39:19Z
ijet:EMC
"160908 2016 eng "
2300-1933
dc
An Experimental Study of Conducted EMI Mitigation on the LED Driver using Spread Spectrum Technique
Hariyawan, Mohammad Yanuar
Politeknik Caltex Riau http://yanuar.telkom.pcr.ac.id/
Hidayat, Risanuri
Gadjah Mada University
Firmansyah, Eka
Gadjah Mada University
(LED driver; conducted; EMI; luminance; spreadspectrum)
LED driver has the potential to interfere the system of electronic devices if the voltage and current change rapidly. Several previous studies presented various solutions to overcome this problem such as particular converter design, component design, electromagnetic interference (EMI) filters, and spread-spectrum techniques. Compared to other solutions, the spread-spectrum technique is the most potential way to reduce the EMI in LED applications due to its limited cost-size-weight. In this paper, the effectiveness of conducted EMI suppression performance and the evaluation of its effect on LED luminance using spread-spectrum techniques are investigated. Spread-spectrum is applied to the system by modifying the switching frequency by providing disturbances at pin IADJ. The disorder is given in the form of four signals, namely square, filtered-square, triangular, and sine disturbance signals. The highest level of the EMI suppression of about 31.89% is achieved when the LED driver is given 800 mVpp filtered-square waveform. The highest reduction power level occurs at fundamental frequency reference, when it is given 700 mVpp square disruption signal, is about 81.77% reduction. The LED luminance level will reduce by 85.2% when it is given the four waveforms disruption signals. These reductions occur as the switching frequency of the LED driver does not work on a fixed frequency, but it varies in certain bands. LED brightness level has a tendency to generate a constant value of 235 lux when it is given the disruption signals. This disturbance signal causes the dimming function on the system that does not work properly.
Electronics and Telecommunications Committee
2016-09-08 13:20:11
application/pdf
http://ijet.pl/index.php/ijet/article/view/10.1515-eletel-2016-0041
International Journal of Electronics and Telecommunications; Vol 62, No 3 (2016)
eng
Copyright (c) 2016 International Journal of Electronics and Telecommunications
oai:ojs.ijet.ise.pw.edu.pl:article/780
2017-10-31T00:24:38Z
ijet:EMC
"171031 2017 eng "
2300-1933
dc
Evaluation of the Impact of Transient Disturbances on Railway Signaling Systems Using an Adapted Time-Frequency Analysis Method
Kousri, Mohamed Raouf
Technological Research Institute Railenium
COSYS/LEOST of IFSTTAR
University of Lille 1 Science and Technology
Deniau, Virginie
COSYS/LEOST, IFSTTAR
Heddebaut, Marc
COSYS/LEOST, IFSTTAR
Baranowski, Sylvie
Univ. Lille, UMR 8520 IEMN, F-59000 Lille, France
Electromagnetic Compatibility; Telecommunication; Railway signaling
As many other industrial environments, the railway electromagnetic environment is characterized by a large number of electromagnetic signals and disturbances. Among these, transient signals, with high energy level and wide frequency spectrum, represent an important threat to different signaling subsystems. In this paper, a new methodology dedicated to the detection and the characterization of the transient disturbances is presented. Based on a flexible and adjustable time-frequency analysis, this methodology is used to evaluate the impact of transient disturbances on a ground‑to‑train radio communication. A test bench was developed in order to validate the results of this evaluation.
Electronics and Telecommunications Committee
2017-10-31 01:03:37
application/pdf
http://ijet.pl/index.php/ijet/article/view/10.1515-eletel-2017-0047
International Journal of Electronics and Telecommunications; Vol 63, No 4 (2017)
eng
Copyright (c) 2017 International Journal of Electronics and Telecommunications