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Evaluate Recent Numerical Methods for Long-Term Simulation to Study the Effect of Different Shapes of Thermal Bridges in Walls

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Defect and Diffusion Forum 2024年 436卷 77-90页

作者： Omle, Issa Kovács, Endre Department of Fluid and Heat Engineering Faculty of Mechanical Engineering and Informatics University of Miskolc Miskolc3515 Hungary Institute of Physics and Electrical Engineering Faculty of Mechanical Engineering and Informatics University of Miskolc Miskolc3515 Hungary

According to previous studies, the most effective, stable, and explicit numerical methods to deal with problems of heat transfer in building walls are the two recently published approaches, which are the modified Dufort-Frankel and leapfrog-hopscotch techniques, which are used in this study to make transient and long-term simulations (three months of the winter season) of 2-D space systems that enable us to execute these simulations with relatively short computational times to evaluate the two most effective versions of these methods. Our solution to a real-world engineering challenge involves investigating thermal bridges of different forms inside multilayer walls of buildings exposed to environmental factors specific to Hungary's climate, such as the outside temperature and sun radiation, to improve energy efficiency. The distributions of temperatures and the total heat loss (across the walls) are calculated for all cases (three layers without a thermal bridge three layers with thermal bridges in straight, bent, and L-shaped shapes). © 2024 Trans Tech Publications Ltd, All Rights Reserved.

关键词： Walls (structural partitions)

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A Recommendation System for Double Track Program Skill Selection Using the Analytic Hierarchy Process (AHP) 10

A Recommendation System for Double Track Program Skill Selec...

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10th IEEE Information Technology International Seminar, ITIS 2024

作者： Bughowi, Mohamad Kholid Sunaryono, Dwi Baskoro, Fajar Faculty of Intelligent Electrical and Informatics Technology Department of Informatics Engineering Surabaya Indonesia

ISBN: (纸本)9798331521295

The Double Track Program prepares high school students for careers or entrepreneurship through skills training, aiming to reduce post-graduation unemployment in East Java. It offers seven skill areas: multimedia, culinary arts, fashion design, beauty treatment, electrical engineering, electrical technology, and light vehicle engineering. Students choose one skill area for a year. However, mismatched expectations can lead to wasted time, poor outcomes, and frustration. To address this, a web-based recommendation system was developed to suggest skill areas based on criteria such as job availability, salary, interests, facilities, and entrepreneurial opportunities. The system employs the Analytic Hierarchy Process (AHP) method to support decision-making. It is implemented as a website using TypeScript, Go, the *** framework, and PostgreSQL for data storage. Testing with 77 eleventh-grade students from Dharma Wanita Surabaya High School showed that the top three recommendations achieved an average accuracy of 77.3036%, while the top five reached 77.5510%. Overall, the system demonstrated an average accuracy of 78.4521%, proving effective in guiding students toward skill areas that align with their goals. © 2024 IEEE.

关键词： Decision making

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Motion Detection Methods Applied on RGB-D Images for Vehicle Classification on the Edge Computing

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IEEE Internet of Things Journal 2025年第12期12卷 19631-19645页

作者： Micko, Kristian Papcun, Peter Technical University in Košice Faculty of Electrical Engineering and Informatics Department of Cybernetics and Artificial Intelligence Košice Slovakia

Intelligent Transportation Systems rely on data processing methods in real-time conditions. There are many methods to process the data. However, the progress of hardware computational power forces us to reassess the effectiveness of some methods. The first idea for discussion is whether cloud or fog computing is necessary to process Computer Vision methods in real-time conditions. The second idea for discussion is whether a depth map gained from the 2D image monocular estimation is suitable as an extra feature to process. Another scientific question is the categorization of the vehicles based on 3D data by extracted volume or height features. This approach could be useful for ToF camera output. This study simulates the output of a ToF camera with a resolution higher than VGA via the monocular depth map estimation with the Convolutional Neural Network model MiDaS. This article proposes the computational architectures for data processing between SBCs with various computational power. Data processing includes obtaining, feature extraction, and classification via various methods. These methods are image loading, background subtraction, shadow removal, monocular depth estimation, pointcloud calculation, 3D convex hull, and volume thresholding. Volume thresholding is a reliable approach for categorization into light and heavy vehicles. Background subtractors connected with K-Means are reliable for vehicle detection without shadows. © 2014 IEEE.

关键词： Fog computing

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Neighbor Displacement-Based Enhanced Synthetic Oversampling for Multiclass Imbalanced Data

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Computers, Materials & Continua 2025年第6期83卷 5699-5727页

作者： I Made Putrama Péter Martinek Department of Electronics Technology Faculty of Electrical Engineering and InformaticsBudapest University of Technology and EconomicsBudapest1111Hungary Department of Informatics Faculty of Engineering and VocationalUniversitas Pendidikan GaneshaSingaraja81116Indonesia

Imbalanced multiclass datasets pose challenges for machine learning *** often contain minority classes that are important for accurate ***,when the data is sparsely distributed and overlaps with data points fromother classes,it introduces *** a result,existing resamplingmethods may fail to preserve the original data patterns,further disrupting data quality and reducingmodel *** paper introduces Neighbor Displacement-based Enhanced Synthetic Oversampling(NDESO),a hybridmethod that integrates a data displacement strategy with a resampling technique to achieve data *** begins by computing the average distance of noisy data points to their neighbors and adjusting their positions toward the center before applying random *** evaluations compare 14 alternatives on nine classifiers across synthetic and 20 real-world datasetswith varying imbalance *** evaluation was structured into two distinct test ***,the effects of k-neighbor variations and distance metrics are evaluated,followed by a comparison of resampled data distributions against alternatives,and finally,determining the most suitable oversampling technique for data ***,the overall performance of the NDESO algorithm was assessed,focusing on G-mean and statistical *** results demonstrate that our method is robust to a wide range of variations in these parameters and the overall performance achieves an average G-mean score of 0.90,which is among the ***,it attains the lowest mean rank of 2.88,indicating statistically significant improvements over existing *** advantage underscores its potential for effectively handling data imbalance in practical scenarios.

关键词： Neighbor displacement synthetic oversampling multiclass imbalanced data

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A Self-adapting Pixel Antenna - Substrate Lens System for Infrared Frequencies

Periodica Polytechnica Electrical Engineering and Computer S...

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Periodica Polytechnica electrical engineering and Computer Science 2025年第1期69卷 14-25页

作者： Shubbar, Mustafa Rakos, Balázs Department of Automation and Applied Informatics Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics Műegyetem rkp. 3. BudapestH-1111 Hungary

In this work, we propose a concentrator lens - antenna arrangement, potentially suitable for infrared sensing and energy harvesting rectenna systems. The structure consists of a pixel antenna, self-adapting for the direction of the incident infrared radiation, and a concentrator lens, both optimized for the mid-infrared spectrum. The silicon substrate lens is situated above the pixel antenna, enabling the concentration of the incident light on the antenna;silicon was chosen due to its transparency in the IR spectrum. We examine how various parameters of the lens, in conjunction with the different states of the pixel antenna, affects the performance of the system. The simulations show that the gain of the arrangement increases considerably in correlation with the radius of the lens. The results suggest that the energy conversion efficiency of infrared rectenna systems can be enhanced by several orders of magnitude with the utilization of the proposed arrangement. © 2025 Budapest University of Technology and Economics. All rights reserved.

关键词： Rectennas

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Humidification Degree Effect under Rain of Inclined Silicone Insulation on its Electric Performance

Periodica polytechnica Electrical engineering and computer s...

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Periodica polytechnica electrical engineering and computer science 2024年第1期68卷 94-106页

作者： Slimani, Samia Medjdoub, Abdellah Kornhuber, Stefan Laboratory of Electrical Engineering Faculty of Technology University of Bejaia Bejaia06000 Algeria Faculty of Electrical Engineering and Informatics University of Applied Sciences Zittau/Görlitz Theodor-Koerner-Allee 16 Zittau02763 Germany

This investigation is focused on the effect of inclination angle with respect to the horizontal of a hydrophobic silicone insulation, on the rate of its creepage distance's wetting by natural rain. The constellation of rainwater drops obtained on the de-energized site is then reproduced in the laboratory, to quantify the effect of their volume on the humidification intensity of the inclined insulation's creepage distance, and therefore its electrical performance under different alternating voltage levels. For this purpose, two different experimental devices allowing the variation of the insulation's inclination angle were set-up. The first one is dedicated to the on-site display of silicone samples in natural rain. The second one allows the study of the applied voltage's effect on the wetting degree of the insulation's surface. All the performed tests were supported by camera visualization. On-site measurement results show a decline in the length of the creepage distance of the natural rain-wetted insulation with increasing its inclination angle. Laboratory results also show a decrease in the size of the insulation's wet surface with increasing its inclination angle. These two characteristics reveal two different intervals of critical inclination angles of the insulation, unfavorable and favorable, for the dimensioning of the insulators' sheds corresponding respectively to their minimum and maximum electrical performance. © 2024 Budapest University of Technology and Economics. All rights reserved.

关键词： Drops

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Double-crossed Bowtie Antenna-coupled Carbon Nanotube Microbolometer with Meander Structures at 1THz

Double-crossed Bowtie Antenna-coupled Carbon Nanotube Microb...

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2024 International Symposium on Antennas and Propagation, ISAP 2024

作者： Hasiholan, Matthew Gabriel Pangesti Aji, Arie Apriono, Catur Rahardjo, Eko Tjipto Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Indonesia Department of Electrical Engineering Faculty of Engineering and Informatics Universitas Dian Nusantara Indonesia

ISBN: (纸本)9798350364774

A high reception of THz waves is important in the design of an antenna-coupled microbolometer, which is indicated by the ability to detect THz waves effectively from all directions. In this study, we implement the meander line structure in a carbon nanotube (CNT) based bolometer coupled with a double-crossed bowtie antenna. The structure is designed on a SiO2 substrate with an additional metal reflector at the bottom. The simulation results reveal the potential high responsivity of 281.5 kV/W and could effectively minimize the NEP down to 0.0145 pW/Hz1/2. These results demonstrate the prospect of a meander line bolometer structure to enhance THz wave absorption with great potential in the application of real-time imaging. © 2024 IEEE.

关键词： Terahertz waves

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Alignment of Objects in 3D Space Using Radon Transform for Cargo-Mail Scanner 66

Alignment of Objects in 3D Space Using Radon Transform for C...

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66th International Symposium ELMAR, ELMAR 2024

作者： Dobrovolny, Martin University of Pardubice Faculty of Electrical Engineering and Informatics Dept. of Electrical Engineering Pardubice Czech Republic

ISBN: (纸本)9798350375411

This paper presents the results of comparison of the proposed unique algorithm for object alignment in 3D space with the conventional approach based on Principal Component Analysis. The proposed algorithm is based on the use of Radon Transform. The algorithm has been developed for the necessity of designing a 3D scanner for large-scale Cargo-Mail in the field of air logistics. Shipments are sorted in the logistics center of the external partner and then placed in air containers. Using the proposed method, the rotation compensation of objects in the 3D scanner space was effectively solved. Thanks to the proposed method, the scanner works without manual intervention of the operator. The proposed method is robust even for situations with poorly cropped background under packages. © 2024 IEEE.

关键词： 3D scanning Data alignment Point Cloud Principal Component Analysis Radon transform

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Modeling and Simulation of the Variation of the Thermal Flux Yielded by a Medium Temperature Radiant Panel Using Matlab-Simulink 16

Modeling and Simulation of the Variation of the Thermal Flux...

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16th International Conference on Applied and Theoretical Electricity, ICATE 2024

作者： Dinu, Radu Cristian Stan Ivan, Felicia Elena Duinea, Adelaida Mihaela Ravigan, Florin Faculty of Electrical Engineering Department of Electrical Energy and Aerospace Engineering Craiova Romania Faculty of Electrical Engineering Department of Electromechanics Environment and Applied Informatics Craiova Romania

ISBN: (纸本)9798350388107

Nowadays, the issue of efficient heating of enclosed spaces where people carry out different activities has become a priority. This means, on the one hand, using the cheapest and least polluting thermal energy and, on the other hand, using high-performance energy equipment that transmits heat energy as efficiently as possible from the heat carrier (thermal agent) to the air inside the space to be heated. One such heating system is medium-Temperature radiant panel heating using thermal agents. In this paper, starting from a specific construction type of a radiant panel, a study is carried out, using Matlab-Simulink, on the variation of the heat flux transmitted by a medium temperature radiant panel using thermal agent at different temperatures. The modelling algorithm transposed into the simulation scheme in Matlab-Simulink allows a quick and relevant analysis of the behaviour of such a decentralised heating system when operating in rooms with different thermal regimes. © 2024 IEEE.

关键词： Simulink

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Emerging Technologies in Education: Security and Data Protection 21

Emerging Technologies in Education: Security and Data Protec...

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21st International Conference on Emerging eLearning Technologies and Applications, ICETA 2023

作者： Pekarcik, P. Chovancova, E. Kuchcakova, T. University of Košice Faculty of Electrical Engineering and Informatics Technical Faculty of Electrical Engineering and Informatics Technical Department of Computers and Informatics Košice Slovakia

ISBN: (纸本)9798350370690

Information technologies are one of the most prospective fields at universities. The number of young people interested in this science is increasing from year to year. One of the essential parts of IT is security and data protection. Many students perceive this industry as complicated and, therefore, unattractive. If we want to change it, we must focus on introducing emerging technologies in education. These technologies should be chosen so that they motivate the students but at the same time so that the level of acquired knowledge does not drop. Their goal is to make studying this field more attractive and easier for students. The article presents examples of new approaches to security and data protection. This article introduces several standards and concrete tools required for them. © 2023 IEEE.

关键词： Students

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