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Publications - 6374

Segmentation of a road vehicle vibration signal using multiple comparison procedures between paired samples

László Róbert Hári

Publication Name: Tehnicki Vjesnik

Publication Date: 2021-08-01

Volume: 28

Issue: 5

Page Range: 1597-1604

Description:

Segmentation of road vehicle vibration (RVV) signals can occur by the need to analyse or synthesise vibrations obtained in passenger cars or on the stowage of vans, trucks. A general and widely used measure to quantify RVV signals is its description via power spectral density (PSD). From a given PSD a Gaussian signal can be generated in a shaker testing laboratory. However, actual RVVs tend to have a non-Gaussian and nonstationary nature, which can be modelled as a composition of different segments, each with a different length and RMS content. For simulation purposes of nonstationary vibration signals, different approaches have been introduced yet each with its unique signal segmentation approaches. The current paper proposes a signal segmentation method implemented in the time-frequency domain in order to find segments within an RVV signal, where each segment has similarity in-between and is dissimilar to neighbouring segments. For this purpose, multiple comparison tests had been utilised between the Short-time Fourier transforms (STFT) applied on given fractions of an RVV. Different countermeasures had been applied against the Type I. error inflation.

Open Access: Yes

DOI: 10.17559/TV-20200122112551

Relationships between Shear Strength Parameters with Mineralogy and Index Properties of Compacted, Unsaturated Soils

Elizabeth Theron Sai K. Vanapalli Armand Augustin Fondjo R. P. Ray

Publication Name: Studia Geotechnica Et Mechanica

Publication Date: 2025-03-01

Volume: 47

Issue: 1

Page Range: 65-88

Description:

The objective of this study is to assess the influences of soil index properties, swelling parameters, and soil mineralogy on unsaturated shear strength parameters (φ', φb, c') of compacted expansive soils. The laboratory tests include the grain size distribution, specific gravity (Gs), Atterberg limits, swelling potential, X-ray diffraction, modified Proctor compaction, soil suction, and triaxial testing. MINITAB 19 statistical analysis software generates the tri-dimensional surface graphs. The values φ', φb, and c"are majorly influenced by water (%), Gs, and clay (%). φ"shows a strong correlation with free swell ratio (FSR), free swell index (FSI), and void ratio. φb demonstrates a strong relationship with liquid limit, plasticity index, and γd (dry unit weight). φ"and c"portray a moderate relationship with liquid limit, plasticity limit, and γd. φ"exhibits a moderate correlation with smectite (%) and plagioclase (%). φb describes a strong relationship with smectite (%) and a moderate correlation with plagioclase and K-feldspar (%). c"depicts a moderate correlation with smectite (%), K-feldspar (%), and plagioclase (%). The matric suction controls the behaviour of unsaturated soils. Nonetheless, the influences of soil index properties, swelling potential, and mineralogy on shear strength are not marginal. These findings provide a good insight into the behaviour of unsaturated expansive soils and contribute to enhancing geotechnical modelling.

Open Access: Yes

DOI: 10.2478/sgem-2025-0006

Robustness of fuzzy flip-flop based neural networks

László Gál Rita Lovassy Ĺaszĺo T. Ḱoczy

Publication Name: 11th IEEE International Symposium on Computational Intelligence and Informatics Cinti 2010 Proceedings

Publication Date: 2010-12-01

Volume: Unknown

Issue: Unknown

Page Range: 207-211

Description:

In this paper the robustness of three different types of Fuzzy Flip-Flop based Neural Network (FNN) and the standard tansig based neural networks is compared from the various test function approximation goodness points of view. It is tested how well the fuzzy flip-flop based and the simulated neural networks handle the test data sets outlier points. The robust design of the FNN is presented, and the best suitable fuzzy neuron type is emphasized. Furthermore, the sensitivity of fuzzy neural networks to the fuzzy neuron type and hidden layers neuron number is evaluated. ©2010 IEEE.

Open Access: Yes

DOI: 10.1109/CINTI.2010.5672248

Remanufacturing a Synchronous Reluctance Machine with Aluminum Winding: An Open Benchmark Problem for FEM Analysis

Miklós Kuczmann Mihaly Katona Tamas Orosz Zoltan Nemeth Dávid Gábor Bányai

Publication Name: Electronics Switzerland

Publication Date: 2024-02-01

Volume: 13

Issue: 4

Page Range: Unknown

Description:

The European Union’s increasing focus on sustainable and eco-friendly product design has resulted in significant pressure on original equipment manufacturers to adopt more environmentally conscious practices. As a result, the remanufacturing of end-of-life electric machines is expected to become a promising industrial segment. Identifying the missing parameters of these types of machines will play an essential role in creating feasible and reliable redesigns and remanufacturing processes. A few case studies related to this problem have been published in the literature; however, some novel, openly accessible benchmark problems can facilitate the research and function as a basis for comparing and validating novel numerical methods. This paper presents the identification process of an experimental synchronous machine. It outlines methodologies for identifying material properties, winding schemes, and other critical parameters for the finite element analysis and modelling of electric machines with incomplete information. The machine in question is intended for remanufacturing, with the plan to replace its faulty winding with an aluminium-based alternative. It also serves as an open benchmark problem for researchers, designers, and practitioners.

Open Access: Yes

DOI: 10.3390/electronics13040727

Evaluation of human-Myo gesture control capabilities in continuous search and select operations

Adam Csapo Hunor Nagy Gyorgy Wersenyi Arni Kristjansson

Publication Name: 7th IEEE International Conference on Cognitive Infocommunications Coginfocom 2016 Proceedings

Publication Date: 2017-01-03

Volume: Unknown

Issue: Unknown

Page Range: 415-420

Description:

Tactile and haptic devices can be used to control and interact with a wide range of systems, including games, virtual environments and assistive technologies. Although many psychophysical studies have measured thresholds of human sensory capabilities for interpreting haptic and tactile feedback, relatively little is known about the precision with which we are able to guide the behavior of a system based on kinesthetic and myoelectric gestures. A broad study of the latter problem is important, especially now that a number of devices have appeared-such as the Leap Motion Controller and the Myo armband-which enable humans to use finger, hand and arm gestures to interact with the digital world. This paper provides a broad overview on the topic, and reports a set of preliminary experiments on the extent to which the Myo armband can be used to control auditory feedback in real time. Test results are evaluated based on a Bayesian statistical model of an empirical (but for the most part, unambiguous) performance scale. The goal is to investigate ways in which visually impaired users could use the Myo to control the output of an assistive technology.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2016.7804585

Synchronistic historical background for Jung-Pauli's modelling of psyche and nature concerning the aquarius myth part II: The aquarius mythologem and representations of St. Andrew in the Hortus Deliciarum

Peter Varlaki Péter Baranyi

Publication Name: 7th IEEE International Conference on Cognitive Infocommunications Coginfocom 2016 Proceedings

Publication Date: 2017-01-03

Volume: Unknown

Issue: Unknown

Page Range: 455-468

Description:

In the paper we attempt to present the same in a very beautiful and uniquely interesting picture of the Hortus Deliciarum, with St. Andrew in the leading role, representing St. John the Baptist. We compare the meaning system and the numerical structure of this the Hortus Deliciarum image to the Pala d'Oro's beautiful and unique enamel of hidden meaning, depicting the presentation of the child Christ in the 'Temple.'. On tha basis of this interpretation and comparison it can be considered as a historical background of the Aquarius mythologem and its Jung-Pauli kinds of imagination and interpretation.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2016.7804590

Experimental Wear Analysis of Nano-Sized Titania Particles as Additives in Automotive Lubricants

D. Tóth I. Szabó Hebah Abdallah Hajnalka Hargitai

Publication Name: Micro

Publication Date: 2023-09-01

Volume: 3

Issue: 3

Page Range: 715-727

Description:

This study focuses on the wear effects of nano-sized titania as a potential engine lubricant additive. Titanium dioxide nanoparticles have promising wear-reducing properties and significant tribological potential. In this article, titania nanoparticles were homogenized in Group III automotive oil at five different concentrations (0.1; 0.2 … 0.5 wt%). The nanodoped oil samples were tested on a linear oscillating tribometer with oil circulation. Based on the tribological results, titania nanoparticles increased friction by 20–32% but can reduce the wear area by up to 32%. According to the confocal microscopic examination, wear volume can be reduced by up to 57% with titania nanoparticles. Titania nanoparticles improved the repeatability of tribological measurements. A scanning electron microscopy examination of the wear track revealed that the characteristic wear of the tribological system was abrasive, but a significant amount of adhesive wear was also observed. Energy dispersive X-ray spectroscopy analysis found that the nanoparticles fill the deeper trenches of the wear. The worn surface uniformly contains TiO2 particles and the quantified normalized titanium concentration was between 0.56 and 0.62%.

Open Access: Yes

DOI: 10.3390/micro3030050

Cultural Differences and the Application of Diplomatic Protocol in the Central and Eastern European Region

Julia Szoke Júlia Hajszán Júlia Szőke

Publication Name: European Journal of Interdisciplinary Studies

Publication Date: 2025-12-01

Volume: 17

Issue: 2

Page Range: 145-160

Description:

The success of diplomatic relations is closely linked to the understanding of cultural differences and the proper application of diplomatic protocol. In the countries of the Central and Eastern European region, the diverse historical experiences, collective memories, and socio-cultural characteristics significantly shape both formal and informal diplomatic behavior. This paper examines how cultural differences influence the application of diplomatic protocols in the region, with a particular focus on the role of cultural sensitivity in diplomatic interactions. Adopting a qualitative, multiple case study approach, the research analyzes contemporary diplomatic incidents in which culturally embedded symbols, gestures, dress codes, and gift-giving practices led to protocol unconventionalities or failures. The findings demonstrate that a lack of cultural sensitivity may result in misunderstandings, public embarrassment or diplomatic tension, while culturally informed protocol practices can contribute to strengthening bilateral and multilateral relations. By integrating cultural sensitivity theory with the analysis of diplomatic protocol and providing empirical evidence from Central and Eastern Europe, the paper contributes to the literature by offering a region-specific and practice-oriented perspective on diplomacy. The paper highlights how seemingly minor protocol deviations can carry significant symbolic and political meanings in culturally sensitive contexts, thereby influencing the elusiveness of international relations.

Open Access: Yes

DOI: 10.24818/ejis.2025.19

Determination of the Centre of Gravity of Electric Vehicles Using a Static Axle-Load Method

David Jozsa Balázs Baráth

Publication Name: Future Transportation

Publication Date: 2026-02-01

Volume: 6

Issue: 1

Page Range: Unknown

Description:

Accurate determination of a vehicle’s centre of gravity (CoG) is fundamental to driving dynamics, safety, and engineering design. However, existing static CoG estimation methods often neglect tyre deflection and detailed wheel geometry, which can introduce significant errors, particularly in electric vehicles, where the low and concentrated mass of the battery pack increases the sensitivity of vertical CoG calculations. This study presents a refined static axle-load-based method for electric vehicles, in which the influence of tyre deformation and lifting height on the accuracy of the vertical centre of gravity coordinate is explicitly considered and quantitatively justified. To minimise human error and accelerate the evaluation process, a custom-developed Python (Python 3.13.2.) software tool automates all calculations, provides an intuitive graphical interface, and generates visual representations of the resulting CoG position. The methodology was validated on a Volkswagen e-Golf, demonstrating that the proposed approach provides reliable and repeatable results. Due to its accuracy, reduced measurement complexity, and minimal equipment requirements, the method is suitable for design, educational, and diagnostic applications. Moreover, it enables faster and more precise preparation of vehicle dynamics tests, such as rollover assessments, by ensuring that sensor placement does not interfere with vehicle behaviour.

Open Access: Yes

DOI: 10.3390/futuretransp6010022