Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512146
Andrea Štubendeková, L. Janoušek
This work deals with eddy current nondestructive testing using swept frequency. A plate specimen made of austenitic steel SUS 316L containing artificial electro-discharged notches is investigated by two eddy current probes. A wide frequency range is used for the experiments while the probes containing transmitting and receiving coils are located in fixed position. The amplitude frequency characteristics of the probes are recorded as the response signals. Influence of the defects' length on the response signals is evaluated in order to investigate resolution of the method.
{"title":"Influence of selected defect parameter on response signals in swept frequency electromagnetic nondestructive testing","authors":"Andrea Štubendeková, L. Janoušek","doi":"10.1109/ELEKTRO.2016.7512146","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512146","url":null,"abstract":"This work deals with eddy current nondestructive testing using swept frequency. A plate specimen made of austenitic steel SUS 316L containing artificial electro-discharged notches is investigated by two eddy current probes. A wide frequency range is used for the experiments while the probes containing transmitting and receiving coils are located in fixed position. The amplitude frequency characteristics of the probes are recorded as the response signals. Influence of the defects' length on the response signals is evaluated in order to investigate resolution of the method.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130109243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512104
L. Veg, K. Hruska, J. Laksar, Lucie Horníková
The article deals with the influence of different voltage levels on the design and properties of a synchronous generator with salient pole rotor. It presents two parallel designs of mostly identical synchronous generators with different rated voltages. Depending on results of both designs the designed generators are compared with focus on their working parameters, cooling conditions and material consumption.
{"title":"The effect of different rated voltages on the properties of a synchronous generator","authors":"L. Veg, K. Hruska, J. Laksar, Lucie Horníková","doi":"10.1109/ELEKTRO.2016.7512104","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512104","url":null,"abstract":"The article deals with the influence of different voltage levels on the design and properties of a synchronous generator with salient pole rotor. It presents two parallel designs of mostly identical synchronous generators with different rated voltages. Depending on results of both designs the designed generators are compared with focus on their working parameters, cooling conditions and material consumption.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116511747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512112
Igor Miklósik, Peter Kello, J. Spalek
This paper deals with fire detection simulation by fiber laser in the road tunnel. Influence of the pressure difference for various vehicle type fire scenarios on the air speed in the tunnel is considered by evaluation of the average temperature in the fire section. Final simulation experiment is realized in programmable logic controller based tunnel simulator of road tunnels technological equipment.
{"title":"Fiber laser fire detection in the tunnel simulator","authors":"Igor Miklósik, Peter Kello, J. Spalek","doi":"10.1109/ELEKTRO.2016.7512112","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512112","url":null,"abstract":"This paper deals with fire detection simulation by fiber laser in the road tunnel. Influence of the pressure difference for various vehicle type fire scenarios on the air speed in the tunnel is considered by evaluation of the average temperature in the fire section. Final simulation experiment is realized in programmable logic controller based tunnel simulator of road tunnels technological equipment.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131908754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512033
Viktor Durcek, M. Kuba, M. Dado
Decoding performance of turbo decoder is weakened, if trellis ends in an unknown state. Trellis termination is an important method for overcoming this problem and improving performance of turbo codes by periodically adding tail bits into information sequence. In this paper various types of trellis termination are described. Performance of a turbo code without trellis termination and the turbo code with its first trellis terminated is compared. Turbo encoder used in simulations is based on design from 3GPP/UMTS and 3GPP/LTE standards while BCJR algorithm is used for decoding.
{"title":"Impact of trellis termination on performance of turbo codes","authors":"Viktor Durcek, M. Kuba, M. Dado","doi":"10.1109/ELEKTRO.2016.7512033","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512033","url":null,"abstract":"Decoding performance of turbo decoder is weakened, if trellis ends in an unknown state. Trellis termination is an important method for overcoming this problem and improving performance of turbo codes by periodically adding tail bits into information sequence. In this paper various types of trellis termination are described. Performance of a turbo code without trellis termination and the turbo code with its first trellis terminated is compared. Turbo encoder used in simulations is based on design from 3GPP/UMTS and 3GPP/LTE standards while BCJR algorithm is used for decoding.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133834233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512129
L. Hargaš, D. Koniar, Zuzana Loncová, M. Hrianka, A. Simonová, Marta Joskova
The searching for artefacts in video sequences is realized to find objects which can cause false detection of cilia's movement. The motion in video sequence can be generated by cilia of respiratory epithelium as well as by some artefacts, e.g. red blood cells, air bubbles or dead cells of the respiratory epithelium. Removal of artefacts causing false detections of movement is an important task when the motion area is evaluated. This article deals with the procedures and methods which enable searching and removing such artefacts that may cause incorrect detection of moving area. The effectiveness of pattern matching for artefacts detections in four most typical videos is finally compared and evaluated in results paragraph.
{"title":"Artefacts detection for video sequences analysis","authors":"L. Hargaš, D. Koniar, Zuzana Loncová, M. Hrianka, A. Simonová, Marta Joskova","doi":"10.1109/ELEKTRO.2016.7512129","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512129","url":null,"abstract":"The searching for artefacts in video sequences is realized to find objects which can cause false detection of cilia's movement. The motion in video sequence can be generated by cilia of respiratory epithelium as well as by some artefacts, e.g. red blood cells, air bubbles or dead cells of the respiratory epithelium. Removal of artefacts causing false detections of movement is an important task when the motion area is evaluated. This article deals with the procedures and methods which enable searching and removing such artefacts that may cause incorrect detection of moving area. The effectiveness of pattern matching for artefacts detections in four most typical videos is finally compared and evaluated in results paragraph.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133975495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512027
M. Pinxten, Peter Hockicko
The transition from secondary education to university is a pivotal moment in many students' educational career. In this paper we will examine how characteristics of incoming science and engineering students influence their study results in the first semester at the University of Žilina. More specifically, we will investigate how we can predict study success after the first semester on the basis of students' educational background in secondary school (e.g., prior math grades, type of secondary school) on the one hand and their learning and study behavior in secondary school on the other. In order to answer this question, an extensive questionnaire was administered to a sample of 814 students from different study programs (Civil Engineering, Electrical Engineering, Security Engineering, and Sciences) at the University of Žilina. Our results show that a number of variables explain students study results (GPA & credits obtained). Students' math grades in secondary school and the type of school attended both have a significant relation with students' GPA and credits earned after the first semester. Students with better math grades who enter university from Gymnasium generally perform better than their peers with lower math grades or from another school type. Except for the motivation, time management and test strategies scales, we did not observe effects of students' learning and study strategies on their GPA and credits earned. Measurement issues and possible directions for future research will be thoroughly discussed.
{"title":"Predicting study success of first-year science and engineering students at the university of Žilina: An exploration of the added value of measuring incoming students' learning and study strategies","authors":"M. Pinxten, Peter Hockicko","doi":"10.1109/ELEKTRO.2016.7512027","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512027","url":null,"abstract":"The transition from secondary education to university is a pivotal moment in many students' educational career. In this paper we will examine how characteristics of incoming science and engineering students influence their study results in the first semester at the University of Žilina. More specifically, we will investigate how we can predict study success after the first semester on the basis of students' educational background in secondary school (e.g., prior math grades, type of secondary school) on the one hand and their learning and study behavior in secondary school on the other. In order to answer this question, an extensive questionnaire was administered to a sample of 814 students from different study programs (Civil Engineering, Electrical Engineering, Security Engineering, and Sciences) at the University of Žilina. Our results show that a number of variables explain students study results (GPA & credits obtained). Students' math grades in secondary school and the type of school attended both have a significant relation with students' GPA and credits earned after the first semester. Students with better math grades who enter university from Gymnasium generally perform better than their peers with lower math grades or from another school type. Except for the motivation, time management and test strategies scales, we did not observe effects of students' learning and study strategies on their GPA and credits earned. Measurement issues and possible directions for future research will be thoroughly discussed.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"868 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125097097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512152
Emil Jahoda, L. Varačka, J. Kúdelčík, M. Kúdelčíková
Surface partial discharges may degrade the electrical insulation in time, so they are destructive to material. For the measurement of surface partial discharges (PD) it was used a needle-cylinder electrode configuration and the analyses were done using the phase-resolved partial measurement and pulse-sequence. The surface PDs were spread between the zero cross and the peak of applied voltage. The effect of surface charge and the surface discharge events for various insulation materials were analyzed by PDs patterns, too. The corona discharge was observed when the needle tip was distant from surface insulation.
{"title":"Study of the surface discharge on the air-insulation interface","authors":"Emil Jahoda, L. Varačka, J. Kúdelčík, M. Kúdelčíková","doi":"10.1109/ELEKTRO.2016.7512152","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512152","url":null,"abstract":"Surface partial discharges may degrade the electrical insulation in time, so they are destructive to material. For the measurement of surface partial discharges (PD) it was used a needle-cylinder electrode configuration and the analyses were done using the phase-resolved partial measurement and pulse-sequence. The surface PDs were spread between the zero cross and the peak of applied voltage. The effect of surface charge and the surface discharge events for various insulation materials were analyzed by PDs patterns, too. The corona discharge was observed when the needle tip was distant from surface insulation.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"41 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120915562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512035
Vasilios P. Groumpos, K. Biniari, P. Groumpos
The aim of this paper is to present a new approach in modelling wine quality and quantity using Fuzzy Cognitive Maps trained by non linear Hebbian learning algorithm. The methodology described extracts the knowledge from the experts and exploits their experience on wine production. Two case studies with data from real vineyards were examined. The results of this study show that software tools using Fuzzy Cognitive Maps could be explored further and problems that arise during the wine production could be prevented by an efficient decision support system.
{"title":"A new mathematical modelling approach for viticulture and winemaking using fuzzy cognitive maps","authors":"Vasilios P. Groumpos, K. Biniari, P. Groumpos","doi":"10.1109/ELEKTRO.2016.7512035","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512035","url":null,"abstract":"The aim of this paper is to present a new approach in modelling wine quality and quantity using Fuzzy Cognitive Maps trained by non linear Hebbian learning algorithm. The methodology described extracts the knowledge from the experts and exploits their experience on wine production. Two case studies with data from real vineyards were examined. The results of this study show that software tools using Fuzzy Cognitive Maps could be explored further and problems that arise during the wine production could be prevented by an efficient decision support system.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"235 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120929662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512108
M. Gregor, J. Spalek
The paper describes an approach to implementing genetic programming, which uses the LLVM library to just-in-time compile/interpret the evolved abstract syntax trees. The solution is described in some detail, including a parser (based on FlexC++ and BisonC++) that can construct the trees from a simple toy language with C-like syntax. The approach is compared with a previous implementation (based on direct execution of trees using polymorphic functors) in terms of execution speed.
{"title":"Using LLVM-based JIT compilation in genetic programming","authors":"M. Gregor, J. Spalek","doi":"10.1109/ELEKTRO.2016.7512108","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512108","url":null,"abstract":"The paper describes an approach to implementing genetic programming, which uses the LLVM library to just-in-time compile/interpret the evolved abstract syntax trees. The solution is described in some detail, including a parser (based on FlexC++ and BisonC++) that can construct the trees from a simple toy language with C-like syntax. The approach is compared with a previous implementation (based on direct execution of trees using polymorphic functors) in terms of execution speed.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121195038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512116
Dušan Nemec, M. Hruboš, R. Pirník, A. Janota, V. Simák, T. Mravec
The paper deals with classification of road infrastructure objects, particularly road surface and objects situated in surrounding environment such as facades of buildings and pole-like objects. The attention is paid to processing of three-dimensional models generated and reconstructed on the base of two-dimensional mobile laser scanning. There are different methods available to classify scanned objects; however, various shortcomings and limitations are usually identified in relation to their practical usage. Most classification methods applied to the three-dimensional models are based on range data processing. We present our three-stage classification algorithm that has been proposed and implemented with motivation to explore how range and reflectivity data could be used separately or in fusion to classify certain objects. The paper shows results of practical experiments based on real data recordings and proving usability of the proposed algorithm.
{"title":"Classification of the road infrastructure objects based on mobile two-dimensional laser scanning","authors":"Dušan Nemec, M. Hruboš, R. Pirník, A. Janota, V. Simák, T. Mravec","doi":"10.1109/ELEKTRO.2016.7512116","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512116","url":null,"abstract":"The paper deals with classification of road infrastructure objects, particularly road surface and objects situated in surrounding environment such as facades of buildings and pole-like objects. The attention is paid to processing of three-dimensional models generated and reconstructed on the base of two-dimensional mobile laser scanning. There are different methods available to classify scanned objects; however, various shortcomings and limitations are usually identified in relation to their practical usage. Most classification methods applied to the three-dimensional models are based on range data processing. We present our three-stage classification algorithm that has been proposed and implemented with motivation to explore how range and reflectivity data could be used separately or in fusion to classify certain objects. The paper shows results of practical experiments based on real data recordings and proving usability of the proposed algorithm.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124020780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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