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Acta Electrotechnica et Informatica最新文献

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NUMERICAL DETERMINATION OF VOLTAGE POTENTIAL INSIDE NONHOMOGENEOUS MEDIA USING VARIATIONAL METHODS 用变分法数值确定非均匀介质内电压电位
Acta Electrotechnica et Informatica Pub Date : 2019-03-28 DOI: 10.15546/AEEI-2019-0004
I. Brilla, F. Janiček
{"title":"NUMERICAL DETERMINATION OF VOLTAGE POTENTIAL INSIDE NONHOMOGENEOUS MEDIA USING VARIATIONAL METHODS","authors":"I. Brilla, F. Janiček","doi":"10.15546/AEEI-2019-0004","DOIUrl":"https://doi.org/10.15546/AEEI-2019-0004","url":null,"abstract":"The problem of numerical determination of voltage potential inside one and two dimensional nonhomogeneous media using values of the voltage potential on the boundary of the media has been solved. The convenient form of variational formulation of the problem has been derived. The numerical solution of the problem has been obtained by the method of local variations.","PeriodicalId":31657,"journal":{"name":"Acta Electrotechnica et Informatica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44813412","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}
引用次数: 0
ALTERNATIVE PROOF ON THE CROSSING NUMBER OF K1,1,3,N 关于K1,1,3，N的交叉数的另一个证明
Acta Electrotechnica et Informatica Pub Date : 2019-03-28 DOI: 10.15546/AEEI-2019-0003
M. Staš
{"title":"ALTERNATIVE PROOF ON THE CROSSING NUMBER OF K1,1,3,N","authors":"M. Staš","doi":"10.15546/AEEI-2019-0003","DOIUrl":"https://doi.org/10.15546/AEEI-2019-0003","url":null,"abstract":"","PeriodicalId":31657,"journal":{"name":"Acta Electrotechnica et Informatica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49564542","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}
引用次数: 3
EXTRACTION OF PARAMETERS FROM DYSGRAPHIC HANDWRITING FOR CDSS SYSTEMS CDSS系统中书写困难的参数提取
Acta Electrotechnica et Informatica Pub Date : 2019-03-28 DOI: 10.15546/AEEI-2019-0007
Zuzana Dankovičová, Matus Uchnar
{"title":"EXTRACTION OF PARAMETERS FROM DYSGRAPHIC HANDWRITING FOR CDSS SYSTEMS","authors":"Zuzana Dankovičová, Matus Uchnar","doi":"10.15546/AEEI-2019-0007","DOIUrl":"https://doi.org/10.15546/AEEI-2019-0007","url":null,"abstract":"In this study we address the issue of the handwriting processing by extracting parameters from the written speech. The work applies machine learning method – the decision trees method which aims to recognize the impaired handwriting, particularly dysgraphia. 55 features (e.g. total time, pen movement, pressure, speed, acceleration) were extracted from each out of 80 handwriting samples while analyzing the performance of classifier for the dominant parameter – minimal speed, and without the dominant parameter as well. The experimental results of the classifier are compared to the results of the statistical test – Mann Whitney U-test as a complex and challenging endeavor to create an accurate classification.","PeriodicalId":31657,"journal":{"name":"Acta Electrotechnica et Informatica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42015603","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}
引用次数: 3
IMPACT OF GROUND WIRES ON THE SERIES IMPEDANCE, VOLTAGE AND CURRENT CONDITIONS OF OVERHEAD POWER LINES 地线对架空线路串联阻抗、电压、电流状况的影响
Acta Electrotechnica et Informatica Pub Date : 2019-03-28 DOI: 10.15546/AEEI-2019-0002
Anastázia Margitová, Martin Kanálik, M. Kolcun
{"title":"IMPACT OF GROUND WIRES ON THE SERIES IMPEDANCE, VOLTAGE AND CURRENT CONDITIONS OF OVERHEAD POWER LINES","authors":"Anastázia Margitová, Martin Kanálik, M. Kolcun","doi":"10.15546/AEEI-2019-0002","DOIUrl":"https://doi.org/10.15546/AEEI-2019-0002","url":null,"abstract":"Ground wires are bare conductors which serve to protect the power line from the lightning strike. This article deals with the calculation of the series impedance of the 110 kV overhead power line with one ground wire. The article examines the effect of the ground wire on the series impedance of the 110 kV power line compared to the same power line without the ground wire. In the next part, the principle of elimination of the ground wire is described and the method of including the influence of the ground wire on the series impedance of phase conductors of the 110 kV power line is also described. The conclusion deals with the calculation of voltage and current conditions of the 110 kV power line modelled without the ground wire, with the ground wire and with elimination (reduction) of the ground wire (the ground wire is not modelled, but its effect is included in the series impedance of phase conductors) and then comparison of given models.","PeriodicalId":31657,"journal":{"name":"Acta Electrotechnica et Informatica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43151072","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}
引用次数: 1
COMPARISON COMPRESSION PROPERTIES DWT WITH FB 5/3 AND FB 9/7 比较DWT与fb 5/3和fb 9/7的压缩性能
Acta Electrotechnica et Informatica Pub Date : 2019-01-05 DOI: 10.15546/aeei-2018-0033
O. Kováč, I. Gladisová, Matej Šuľa, V. Palahin
{"title":"COMPARISON COMPRESSION PROPERTIES DWT WITH FB 5/3 AND FB 9/7","authors":"O. Kováč, I. Gladisová, Matej Šuľa, V. Palahin","doi":"10.15546/aeei-2018-0033","DOIUrl":"https://doi.org/10.15546/aeei-2018-0033","url":null,"abstract":"The suitability of 2-dimensional Discrete Wavelet Transform (2D DWT) as a tool in image and video compression is nowadays indisputable. Wavelet based techniques such as JPEG2000 for image compression has a lot more to offer than conventional methods in terms of compression ratio. This paper presents DWT and the use of its compression properties in image processing and briefly describes convolutional implementation of the discrete wavelet transform. More specifically, it deals with lifting implementations of the discrete wavelet transform (LDWT). The main feature of the lifting scheme is that all constructions are derived in the spatial domain. LDWT does not require complex mathematical calculations unlike traditional methods and does not depend on Fourier transforms. The lifting scheme is used to generate second-generation wavelets, which are not necessarily translation and dilation of one particular function. This paper compares two most common types of implementation of LDWT, which are LDWT using a filter banks (FB) 5/3 and 9/7. Within the experiment, the compression properties of the LDWT implementations are compared.","PeriodicalId":31657,"journal":{"name":"Acta Electrotechnica et Informatica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41385743","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}
引用次数: 0
EVALUATION OF DEPTH MODALITY IN CONVOLUTIONAL NEURAL NETWORK CLASSIFICATION OF RGB-D IMAGES rgb-d图像卷积神经网络分类的深度模态评价
Acta Electrotechnica et Informatica Pub Date : 2019-01-05 DOI: 10.15546/AEEI-2018-0029
Michael Varga, J. Jadlovský
{"title":"EVALUATION OF DEPTH MODALITY IN CONVOLUTIONAL NEURAL NETWORK CLASSIFICATION OF RGB-D IMAGES","authors":"Michael Varga, J. Jadlovský","doi":"10.15546/AEEI-2018-0029","DOIUrl":"https://doi.org/10.15546/AEEI-2018-0029","url":null,"abstract":"This paper investigates the value of depth modality in object classification in RGB-D images. We use a simple model based on a multi-layered convolutional neural network which we train on a dataset of segmented RGB-D images of household and office objects. We evaluate and quantify the benefit of additional depth modality and its effect on classification accuracy on this dataset. Also, we compare the benefit of depth channel against the addition of color to grayscale image. Our experimental results support a conclusion, that for these categories of objects the depth modality provides a significant benefit to classification, which also outweighs the benefit of color information. Similar supporting evidence found in recent research is shown in comparison along with the resulting quantified benefit of depth modality.","PeriodicalId":31657,"journal":{"name":"Acta Electrotechnica et Informatica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45760236","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}
引用次数: 3
DATA ANALYSIS OF THE LOGISTICS COMAPANY’S DATA BY MEANS OF BUSINESS INTELLIGENCE 基于商业智能的物流公司数据分析
Acta Electrotechnica et Informatica Pub Date : 2019-01-05 DOI: 10.15546/AEEI-2018-0034
M. Muchová, Ján Paralič, B. Nagyová
{"title":"DATA ANALYSIS OF THE LOGISTICS COMAPANY’S DATA BY MEANS OF BUSINESS INTELLIGENCE","authors":"M. Muchová, Ján Paralič, B. Nagyová","doi":"10.15546/AEEI-2018-0034","DOIUrl":"https://doi.org/10.15546/AEEI-2018-0034","url":null,"abstract":"The aim of this article is to present how we processed and analysed data from a logistics company using various Business Intelligence tools. The theoretical part of the article is therefore focused on defining Business Intelligence concepts and data warehouses that are relevant to the issue. The practical part of the article focuses on editing data, creating dimension tables and facts. The data were collected from the Dynafleet system and originated from a shipping company. The data provided are for the period from 2013 to 2016. We design user scenarios to help the company's manager in making an efficient assignment of drivers to planned delivery routes. The research is focused on design and creation of a logistics system based on data analytics that can continuously analyze the incoming data and generate current decision support reports. The created user scenarios have a wide range of uses and can also be helpful in assessing the performance of individual drivers and their workloads. Using a logistics system, the logistics manager can get the valuable and useful information needed to effectively operate the business.","PeriodicalId":31657,"journal":{"name":"Acta Electrotechnica et Informatica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46006276","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}
引用次数: 0
PERFORMANCE EVALUATION OF MULTIPLE TRANSFORM WATERMARKING SYSTEM FOR PRIVACY PROTECTION OF MEDICAL DATA USING PSNR AND NC 基于PSNR和nc的医疗数据隐私保护多变换水印系统性能评价
Acta Electrotechnica et Informatica Pub Date : 2019-01-05 DOI: 10.15546/aeei-2018-0032
M. Adegboye, Lukman Adewale Ajao, T. A. Badmus
{"title":"PERFORMANCE EVALUATION OF MULTIPLE TRANSFORM WATERMARKING SYSTEM FOR PRIVACY PROTECTION OF MEDICAL DATA USING PSNR AND NC","authors":"M. Adegboye, Lukman Adewale Ajao, T. A. Badmus","doi":"10.15546/aeei-2018-0032","DOIUrl":"https://doi.org/10.15546/aeei-2018-0032","url":null,"abstract":"This paper presents the performance evaluation of a developed multiple transform watermarking system for privacy protection of medical data using Peak Signal to Noise Ratio (PSNR) and Normalized Cross-Correlation (NC). The PSNR was used to evaluate the imperceptibility of the system, while the NC was used to evaluate the robustness of the system under the various attacks include: Gaussian noise, pepper and salt noise, sharp enhancing, image cutting, image compression, low pass filter and image rotation. The obtained result showed that the similarity between original image and watermarked image has PSNR of 52.4595dB as compared to the existing system of 50.0285dB. This indicates that the proposed scheme can conceal the watermark better, and as well retains the image quality.","PeriodicalId":31657,"journal":{"name":"Acta Electrotechnica et Informatica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41500270","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}
引用次数: 1
NEW METHODS FOR SPECIFICATION LATENT LOSSES FOR ELECTRICITY TRANSMISSION BY OVERHEAD LINES 架空线路输电潜在损耗规范的新方法
Acta Electrotechnica et Informatica Pub Date : 2019-01-05 DOI: 10.15546/aeei-2018-0031
L. Pavlov, Vuje a.s. Okružná Trnava Slovak Republic Analysis, L’uboš Skurčák
{"title":"NEW METHODS FOR SPECIFICATION LATENT LOSSES FOR ELECTRICITY TRANSMISSION BY OVERHEAD LINES","authors":"L. Pavlov, Vuje a.s. Okružná Trnava Slovak Republic Analysis, L’uboš Skurčák","doi":"10.15546/aeei-2018-0031","DOIUrl":"https://doi.org/10.15546/aeei-2018-0031","url":null,"abstract":"The submitted contribution is devoted to the issue of the existence of latent losses on the overhead lines. Quantification of latent losses of electricity is a very complicated task, which has been solved in practice for several years. In their assessment, however, often appear some inconsistencies which cause is often unknown. The magnitude of these losses in some cases cannot be negligible. From the point of view of maintaining an efficient and reliable operation of distribution and transmission systems in the future, attention will still need to be paid to the problem of latent loss analysis.","PeriodicalId":31657,"journal":{"name":"Acta Electrotechnica et Informatica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44995718","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}
引用次数: 0
INFLUENCE OF UV RADIATION ON DIELECTRIC ABSORPTION AND DIELECTRIC STRENGTH OF HALLOYSITE NANOTUBES FILLED POLYETHYLENE COMPOSITES 紫外线辐射对高岭土纳米管填充聚乙烯复合材料介电吸收和介电强度的影响
Acta Electrotechnica et Informatica Pub Date : 2019-01-05 DOI: 10.15546/AEEI-2018-0030
P. Kadlec, R. Polanský
{"title":"INFLUENCE OF UV RADIATION ON DIELECTRIC ABSORPTION AND DIELECTRIC STRENGTH OF HALLOYSITE NANOTUBES FILLED POLYETHYLENE COMPOSITES","authors":"P. Kadlec, R. Polanský","doi":"10.15546/AEEI-2018-0030","DOIUrl":"https://doi.org/10.15546/AEEI-2018-0030","url":null,"abstract":"This paper deals with the evaluation of the amount of filler influence and the ultraviolet (UV) radiation influence on selected dielectric properties of the innovative type of composites. These composites consist of a linear low-density polyethylene matrix and a clay filler (with different filling levels) that contains halloysite nanotubes (HNT) primarily. The intended application of tested composites in the field of electrical engineering is in insulating systems of power cables. Attention is paid to the analysis of the behaviour of composites in their charging, which is caused by the connection with the direct voltage source. The volume resistivity and polarization indexes are determined based on this analysis. Analysis of charging based on the measurement of the current, which flows through the sample under constant applied voltage, is supplemented with the short evaluation of the material behaviour after the disconnecting of the voltage source and after the electrode shorting when the material is discharged. Furthermore, the measurement of dielectric strength under an alternating electric field as another key parameter of electrical insulating materials is determined. Results of analyses of absorption and resorption processes and the dielectric strength measurement of materials in the delivered state prove a significant effect of the filler percentage in the composite. Subsequently, markedly different values of selected parameters because of material exposure to UV radiation are also determined. Observed changes in dielectric properties caused by UV irradiation are supported by the analysis of the chemical structure of materials via Fourier transform infrared spectroscopy.","PeriodicalId":31657,"journal":{"name":"Acta Electrotechnica et Informatica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45252250","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}
引用次数: 0
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