@article{MTMT:34773845,
	title = {Validation of graph sequence clusters through multivariate analysis: application to Rovash scripts},
	url = {https://m2.mtmt.hu/api/publication/34773845},
	author = {Hosszú, Gábor László},
	doi = {10.1186/s40494-024-01211-7},
	journal-iso = {HERIT SCI},
	journal = {HERITAGE SCIENCE},
	volume = {12},
	unique-id = {34773845},
	abstract = {This paper introduces the concept of pattern systems that evolve, with a focus on scripts, a specific type of pattern system. The study analyses the development of different script systems, known as scriptinformatics, with a focus on the historical Rovash scripts used in the Eurasian steppe. The aim is to assess the traditional classification of historical inscriptions, referred to as script relics, into distinct Rovash scripts. Clustering and ordination techniques were used to perform multivariate analyses on Rovash scripts and inscriptions. The study presents two new measures, the script-specific holophyletic index and the joint holophyletic index, for evaluating trees produced by hierarchical clustering. The results indicate that holophyletic indices can validate the traditional assignment of inscriptions to scripts through phylogenetic tree evaluation. This method can be extended to include pattern systems with evolutionary properties and graph sequences derived from them, as well as additional scripts and inscriptions.},
	year = {2024},
	eissn = {2050-7445},
	orcid-numbers = {Hosszú, Gábor László/0000-0002-2856-9552}
}

@article{MTMT:34767534,
	title = {Climatically Accelerated Material Processes Determining the Long-Term Reliability of Light-Emitting Diodes},
	url = {https://m2.mtmt.hu/api/publication/34767534},
	author = {Harsányi, Gábor and Poppe, András and Hegedüs, János and Hantos, Gusztáv and Bojta, Péter and Kovacs, Robert},
	doi = {10.3390/ma17071643},
	journal-iso = {MATERIALS},
	journal = {MATERIALS},
	volume = {17},
	unique-id = {34767534},
	abstract = {LEDs (Light-Emitting Diodes) are widely applied not only in decorative illumination but also in everyday lighting in buildings, flats, public areas, and automotive fields. These application areas often mean harsh environments, for example, regarding the humidity content of the surrounding air: besides outdoor and automotive illumination, even the household use cases (kitchen, bathroom, cellar) may represent extreme temperature and humidity variations (often reaching relative humidity levels close to 100%) for these devices; thus, their reliability behaviour in such circumstances should be better understood. Thermally activated processes were studied in several previous publications, but less information is available regarding high-humidity environmental tests. Moisture and temperature ageing tests with appropriate environmental parameter settings were performed as accelerated lifetime tests to investigate not only the effect of temperature but also that of humidity on the ageing and reliability of LED packages containing RGB (red green blue) chips and phosphor-converted white (pcW) LEDs. The ageing was followed not only through monitoring optical/electrical/spectral parameters but also with material analysis. Moisture–material interaction models were proposed and set up. It was found that humidity-accelerated ageing processes are more severe than expected from previous assumptions. RGB and pcW LEDs showed strongly different behaviour.},
	year = {2024},
	eissn = {1996-1944},
	orcid-numbers = {Harsányi, Gábor/0000-0002-8514-8842; Poppe, András/0000-0002-9381-6716; Hegedüs, János/0000-0003-4792-6225; Hantos, Gusztáv/0000-0002-0401-2098}
}

@article{MTMT:34761133,
	title = {Recent Advances of VO2 in Sensors and Actuators},
	url = {https://m2.mtmt.hu/api/publication/34761133},
	author = {Darwish, Mahmoud Ibrahim Azmi and Zhabura, Yana and Pohl, László},
	doi = {10.3390/nano14070582},
	journal-iso = {NANOMATERIALS-BASEL},
	journal = {NANOMATERIALS},
	volume = {14},
	unique-id = {34761133},
	abstract = {Vanadium dioxide (VO2) stands out for its versatility in numerous applications, thanks to its unique reversible insulator-to-metal phase transition. This transition can be initiated by various stimuli, leading to significant alterations in the material’s characteristics, including its resistivity and optical properties. As the interest in the material is growing year by year, the purpose of this review is to explore the trends and current state of progress on some of the applications proposed for VO2 in the field of sensors and actuators using literature review methods. Some key applications identified are resistive sensors such as strain, temperature, light, gas concentration, and thermal fluid flow sensors for microfluidics and mechanical microactuators. Several critical challenges have been recognized in the field, including the expanded investigation of VO2-based applications across multiple domains, exploring various methods to enhance device performance such as modifying the phase transition temperature, advancing the fabrication techniques for VO2 structures, and developing innovative modelling approaches. Current research in the field shows a variety of different sensors, actuators, and material combinations, leading to different sensor and actuator performance input ranges and output sensitivities.},
	year = {2024},
	eissn = {2079-4991},
	orcid-numbers = {Pohl, László/0000-0003-2390-1381}
}

@article{MTMT:34681240,
	title = {Insulator Metal Transition-Based Selector in Crossbar Memory Arrays},
	url = {https://m2.mtmt.hu/api/publication/34681240},
	author = {Darwish, Mahmoud Ibrahim Azmi and Pohl, László},
	doi = {10.3390/electronicmat5010002},
	journal-iso = {ELECTRON MATER},
	journal = {ELECTRONIC MATERIALS},
	volume = {5},
	unique-id = {34681240},
	abstract = {This article investigates resistive random access memory (ReRAM) crossbar memory arrays, which is a notable development in non-volatile memory technology. We highlight ReRAM’s competitive edge over NAND, NOR Flash, and phase-change memory (PCM), particularly in terms of endurance, speed, and energy efficiency. This paper focuses on the architecture of crossbar arrays, where memristive devices are positioned at intersecting metal wires. We emphasize the unique resistive switching mechanisms of memristors and the challenges of sneak path currents and delve into the roles and configurations of selectors, particularly focusing on the one-selector one-resistor (1S1R) architecture with an insulator–metal transition (IMT) based selector. We use SPICE simulations based on defined models to examine a 3 × 3 1S1R ReRAM array with vanadium dioxide selectors and titanium dioxide film memristors, assessing the impact of ambient temperature and critical IMT temperatures on array performance. We highlight the operational regions of low resistive state (LRS) and high resistive state (HRS), providing insights into the electrical behavior of these components under various conditions. Lastly, we demonstrate the impact of selector presence on sneak path currents. This research contributes to the overall understanding of ReRAM crossbar arrays integrated with IMT material-based selectors.},
	year = {2024},
	eissn = {2673-3978},
	pages = {17-29},
	orcid-numbers = {Pohl, László/0000-0003-2390-1381}
}

@inbook{MTMT:34572693,
	title = {Using distance-based methods to calculate optimal and suboptimal parsimony trees},
	url = {https://m2.mtmt.hu/api/publication/34572693},
	author = {Khafajy, Osama Ali Salman and Hosszú, Gábor László},
	booktitle = {Proceedings of the Workshop on the Advances of Information Technology 2024},
	unique-id = {34572693},
	year = {2024},
	pages = {79-84},
	orcid-numbers = {Hosszú, Gábor László/0000-0002-2856-9552}
}

@article{MTMT:34551019,
	title = {Karakterizáló és élettartamvizsgáló mérőkörnyezet LED-ek számára},
	url = {https://m2.mtmt.hu/api/publication/34551019},
	author = {Hantos, Gusztáv},
	journal-iso = {ELEKTROTECHNIKA},
	journal = {ELEKTROTECHNIKA},
	volume = {116.},
	unique-id = {34551019},
	issn = {0367-0708},
	year = {2024},
	pages = {35-39},
	orcid-numbers = {Hantos, Gusztáv/0000-0002-0401-2098}
}

@inproceedings{MTMT:34689425,
	title = {IMPLEMENTATION OF A HIGH-SPEED LED CHARACTERISATION SYSTEM},
	url = {https://m2.mtmt.hu/api/publication/34689425},
	author = {Poppe, András and Hantos, Gusztáv and Hegedüs, János and Ender, Ferenc},
	booktitle = {CIE x050:2023 Proceedings of the 30th Session of the CIE, Ljubljana, Slovenia, September 15 – 23, 2023, Volume 1},
	doi = {10.25039/x50.2023.PO057},
	unique-id = {34689425},
	abstract = {The purpose of this paper is to provide an overview on the realization of the concept aimed at high throughput LED testing. The target was to achieve at least one order of magnitude decrease in the overall testing time spent on a single LED package. The main goal of the improved throughput of laboratory testing of LEDs facilitate that Delph4LED-style LED modelling becomes an industrial reality. The second overall objective is to assure, that isothermal IVL characterization of the LED packages being aged becomes a feasible option, thus making it possible to create the elapsed lifetime dependent multi-domain circuit simulation model of LEDs.},
	year = {2023},
	pages = {1060-1069},
	orcid-numbers = {Poppe, András/0000-0002-9381-6716; Hantos, Gusztáv/0000-0002-0401-2098; Hegedüs, János/0000-0003-4792-6225; Ender, Ferenc/0000-0003-3800-5707}
}

@inproceedings{MTMT:34689398,
	title = {MODELLING THE SPECTRAL POWER DISTRIBUTION OF MONOCHROMATIC AND PHOSPHOR-CONVERTED POWER LEDS},
	url = {https://m2.mtmt.hu/api/publication/34689398},
	author = {Lipák, G. and Takács, D. and Hegedüs, János and Hantos, Gusztáv},
	booktitle = {CIE x050:2023 Proceedings of the 30th Session of the CIE, Ljubljana, Slovenia, September 15 – 23, 2023, Volume 1},
	doi = {10.25039/x50.2023.PO103},
	unique-id = {34689398},
	abstract = {The goal of our work is to prepare a generally usable spectral power distribution model that can be directly applied to the measurement results of LEDs. As a first step, the distribution functions found in the literature were examined based on our measurement results, and the suitable functions for further work were determined. Temperature and forward current-dependent models are then created with the help of polynomial regression, for the parameters established during fitting. In the field of phosphor modelling, a new aging test based on samples with a distant phosphor arrangement was launched, the details of which are discussed in the paper.},
	year = {2023},
	pages = {1168-1177},
	orcid-numbers = {Hegedüs, János/0000-0003-4792-6225; Hantos, Gusztáv/0000-0002-0401-2098}
}

@inproceedings{MTMT:34689374,
	title = {LED LIFETIME TESTS FOR CIRCUIT SIMULATION MODELLING},
	url = {https://m2.mtmt.hu/api/publication/34689374},
	author = {Hegedüs, János and Hantos, Gusztáv and Poppe, András and Kovács, R. and Bojta, Péter and Harsányi, Gábor},
	booktitle = {CIE x050:2023 Proceedings of the 30th Session of the CIE, Ljubljana, Slovenia, September 15 – 23, 2023, Volume 1},
	doi = {10.25039/x50.2023.PP010},
	unique-id = {34689374},
	abstract = {Lifetime testing and modelling studies of LEDs play an increasingly important role in the implementation of design solutions with an Industry 4.0 approach. This article presents the work carried out in two departments of the Budapest University of Technology and Economics, during which the frequency-dependent aging of high-power LEDs in pulsed mode (at the Department of Electron Devices) and the temperature- and relative humidity-dependent aging of low-power LEDs (at the Department of Electronics Technology) were investigated.},
	year = {2023},
	pages = {803-812},
	orcid-numbers = {Hegedüs, János/0000-0003-4792-6225; Hantos, Gusztáv/0000-0002-0401-2098; Poppe, András/0000-0002-9381-6716; Harsányi, Gábor/0000-0002-8514-8842}
}

@inproceedings{MTMT:34448284,
	title = {Thermal Behavior of Crystalline Silicon Bottom Cell in a Monolithic Perovskite/Si Tandem Solar Cells},
	url = {https://m2.mtmt.hu/api/publication/34448284},
	author = {Alshahmani, Ahmad Halal  and Plesz, Balázs},
	booktitle = {2023 29th International Workshop on Thermal Investigations of ICs and Systems (THERMINIC)},
	doi = {10.1109/THERMINIC60375.2023.10325899},
	unique-id = {34448284},
	abstract = {Monolithic Perovskite/Si tandem solar cells represent a promising direction in photovoltaic technology. However, understanding the temperature coefficient is essential for predicting performance and improving the temperature adaptability of these devices under varying weather conditions. This paper conducts a detailed analysis of the thermal behavior of c-Si as a bottom cell in a monolithic Perovskite/Si tandem arrangement, exploring how its behavior differs from standalone configurations. This investigation is carried out through a numerical simulation using SCAPS software. The simulation considers the temperature-dependent bandgap and absorption for both c-Si and perovskite, as well as the temperature effects on series and shunt resistances. Four simulation scenarios were analyzed, 1) as a standalone c-Si solar cell, 2) c-Si bottom cell in perovskite/Si tandem structure with spectrum split at the perovskite bandgap, 3) c-Si bottom cell, considering perovskite temperature-dependent bandgap, and 4) c-Si bottom cell, considering perovskite layer thickness, absorption and its temperature-dependent bandgap. The results reveal that c-Si solar cells in tandem structures experience notable differences in temperature coefficients, especially in the short-circuit and MPP current densities, compared to standalone configurations. This difference is mainly attributed to the spectrum splitting and temperature-dependent perovskite absorption. Splitting the spectrum leads to an increase in the temperature coefficient of JSC from 0.0944% °C-1 to 0.2539% °C-1; this temperature coefficient reached 0.983% °C-1 when the top cell layer thickness and perovskite's temperature-dependent bandgap and absorption were incorporated into the analysis. Nevertheless, only a minor variation was observed in the voltage temperature coefficient, for both in standalone c-Si cells and those incorporated as bottom cells in the tandem structure. © 2023 IEEE.},
	keywords = {TEMPERATURE; PERFORMANCE; SILICON; computer software; THERMODYNAMICS; TEMPERATURE-DEPENDENCE; Spectrum Analysis; Energy gap; Absorption spectroscopy; Temperature dependent; Solar power generation; Thermal behavior; Engineering, Electrical & Electronic; Thermal behaviours; Perovskite solar cells; tandem solar cells; temperature coefficient; tandem solar cell; perovskite; Spectra's; Monolithics; c-Si solar Cell; Current mismatch; Bottom cells; Tandem structure},
	year = {2023}
}