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Found 6674 publications

Evaluation of dummy-head HRTFs in the horizontal plane based on the peak-valley structure in one-degree spatial resolution

György Wersényi

Publication Name: Institute of Noise Control Engineering of the Usa 35th International Congress and Exposition on Noise Control Engineering Inter Noise 2006

Publication Date: 2006-12-01

Volume: 7

Issue: Unknown

Page Range: 4487-4495

Description:

Dummy-heads are often used for standardized measurements where modeling of the human head and torso is relevant. Monaural Head-Related Transfer Functions of a Brüel & Kjaer dummy were measured in the horizontal plane in one-degree spatial resolution. Evaluation is made by plotting the peak-valley structure in frequency. Special frequency and spatial domains can be determined based on the variations of the HRTFs that are relevant to understand physical properties of the dummy -head in measurements and processes of human directional hearing. Symmetries and similarities of measured HRTFs help to scrutinize the perception of directional information in the monaural and binaural evaluation, the "noisy domain" in frequency and space where shadowing of the head occur as well as the filtering effect of the pinna.

Open Access: Yes

DOI: DOI not available

Quasi-Viral Technologies as the Drivers of the Economy Digital Transformation Towards sustainability

Laszlo Vasa Leonid Melnyk Oleksandr Kubatko Satyanand Singh Lyudmila Kalinichenko Leonid Melnyk

Publication Name: Hightech and Innovation Journal

Publication Date: 2025-03-01

Volume: 6

Issue: 1

Page Range: 183-200

Description:

The relevance of the article is related to the phenomenon of quasi-viral technologies, which are the drivers of the phase transition to sustainable development. The study is aimed at defining the category “quasi-viral emerging technology”, as well as the disclosure of their content and form, and the analysis of the features in the conditions of digital transformations. The research method is based on the analysis of transformational changes in the components of the trialectic mechanism of the reproduction of socio-economic systems, which occur under the influence of quasi-viral sustainable technologies. The article defines the quasi-viral process of spreading emerging technologies as a transformational process of the informational component replacement within the technological base by methods imitating the course of viral infection. The signs of quasi-viral processes are formulated on several levels: “infection” due to a change in the information algorithm; substantial user preferences; lack of sufficient barriers; significant potential to increase users; and disruptive efficiency. Signs of quasi-viral technologies have the following types of innovations: renewable energy, 3D printing, electric transport, energy storage, IT technologies, digital recording of information, cloud technologies, etc. The authors hypothesize the possibility of using entropy estimates as the only measure of approximating the results of the implementation of quasi-viral technologies to the state of sustainability in society and nature. The expected results of the spread of quasi-viral technologies can be significant dematerialization of industrial metabolism, provision of functions of self-organization and self-improvement of social systems, preservation of biodiversity and ecosystems of the planet, and formation of the foundations of sustainable development.

Open Access: Yes

DOI: 10.28991/HIJ-2025-06-01-013

Decision support system for evaluating existing apartment buildings based on fuzzy signatures

Gergely Molnarka László T. Kóczy

Publication Name: International Journal of Computers Communications and Control

Publication Date: 2011-01-01

Volume: 6

Issue: 3

Page Range: 442-457

Description:

In historical district at European cities it is a major problem how to take decision on renovating or replacing existing buildings. This problem is imminent in Budapest (Hungary) in many traditional districts such as the Ferencváros district where we selected a compound area for further examination. By financial aid for the renovation of these buildings which awarded by Municipal Assembly of this district in question there is much uncertainty and confusion concerning how to decide whether or not and how to reconstruct a building where new private owners apply for support. In this paper we propose a formal evaluation method based on fuzzy signature rule bases (the formal being a special case of L-fuzzy object). Using the available expert knowledge we propose a fuzzy signature model including relevance weights and weighted aggregations for each node and parent node, respectively, so that as a result a single membership value may be calculated for each building in question. Linguistic labels for decision (such as worthless, average, highly valuable, etc.) are generated from the values thus obtained. Such linguistic calculations might be of help for the Municipal Assembly awarding financial support. A complete example wit 26 buildings is presented. © 2006-2011 by CCC Publications.

Open Access: Yes

DOI: 10.15837/ijccc.2011.3.2129

Effect of Self-driving Buses on Vehicle Scheduling

Balázs Horváth Viktor Nagy

Publication Name: Advances in Intelligent Systems and Computing

Publication Date: 2021-01-01

Volume: 1278

Issue: Unknown

Page Range: 21-29

Description:

We are more and more close to the time when a higher number of autonomous vehicles are appearing in road traffic. The number of unanswered questions does not diminish but grow. One such issue is the role of autonomous vehicles in public transport. When talking about autonomous vehicles we often think of only cars and we think less about self-driving buses. But the economic potential inherent in autonomous buses is huge. In the Hungarian vehicle and crew scheduling practice (and also in other countries) the one driver-one vehicle control is typical. This method closely links the vehicles and the drivers. Vehicles should therefore adapt to the rest time of the crew and the employment rules. Unused reserves are generated in the system. Autonomous vehicles can release this overcapacity. Thanks to that, fewer vehicles can carry out public transport tasks and we can save extra rides. It also provides a solution to the lack of drivers, which is a basic problem in many countries. In our study we show the reserves that can be recovered from the system in the case of three Hungarian cities (Eger, Dunaújváros, Győr). We show how much savings can be achieved by running autonomous buses in European cities with a population of 45 000, 54 000 and 130 000 inhabitants. The results are promising. In smaller cities we could achieve about 20% of economical savings but in bigger cities 40% is also realistic. Our statements are based on only rough calculations and they try to help in preparation for the future.

Open Access: Yes

DOI: 10.1007/978-3-030-61075-3_3

Tribological Investigation of Applicability of Nano-Sized Cupricoxide (CuO) Ceramic Material in Automotive Vehicles

Rajmund Kuti D. Tóth J. Rohde-Brandenburger I. Szabó

Publication Name: Fme Transactions

Publication Date: 2021-01-01

Volume: 49

Issue: 2

Page Range: 335-343

Description:

Due to the continuously increasing requirements of the internal combustion engines, the lubricants and their additives have to be further developed. One possible solution is the application of ceramic nanoparticles as friction modifier and wear decreaser additives. This paper presents the tribological investigation of cupricoxide (CuO) nanoparticle mixed in neat Group 3 base oil. To analyse its properties, simplified ball-on-disc friction experiments were carried out in the tribological laboratory in the Széchenyi István University in Győr, Hungary. The arisen wear scars were analysed with different, highresolution microscopes to understand the working mechanism of the nanoparticles. The results have indicated an optimum concentration of nanoparticles at 0.5wt% where both the average friction coefficient and the wear scar diameter were reduced by 15%. The microscopical investigation revealed the reduction of copper material from the CuO material, and it has mended to the rubbing surface forming a protective film on the metal surface.

Open Access: Yes

DOI: 10.5937/fme2102335T

Is early smoking a fashion trend or a defensive mechanism? - Study on consumer behaviour among students

Ida Ercsey Péter Huszka László Józsa

Publication Name: Economics and Sociology

Publication Date: 2014-01-01

Volume: 7

Issue: 1

Page Range: 142-156

Description:

Health status in Hungary has been deteriorating since the mid-1960s, resulting that Hungary is behind the developed health cultures - mainly Western European - countries. Considering these facts, our scientific interest turned to the examination of health awareness, drinking and smoking habits, healthy lifestyles, state of health and environmental awareness of adolescents and youngsters. To realize these tasks, during the set-up of the sample our aim was to provide representativeness and randomness. The research found that those pupils, who had a harmonious relationship with their parents, maintained a lower level (substance use) smoking and smoking frequency characteristic. No less important is the observation that youngsters try the cigarettes more and more early, but they are far too optimistic in assessing their own health.

Open Access: Yes

DOI: 10.14254/2071-789X.2014/7-1/13

Dissipation-Induced Luttinger Liquid Correlations in a One-Dimensional Fermi Gas

Ádám Bácsi Balázs Dóra Balázs Dóra Cǎtǎlin Paşcu Moca

Publication Name: Physical Review Letters

Publication Date: 2020-04-03

Volume: 124

Issue: 13

Page Range: Unknown

Description:

We study a one-dimensional Fermi gas in the presence of dissipative coupling to environment through the Lindblad equation. The dissipation involves energy exchange with the environment and favours the relaxation of electrons to excitations. After switching on the dissipation, the system approaches a steady state, which is described by a generalized Gibbs ensemble. The fermionic single particle density matrix resembles deceivingly to that in a hermitian interaction quench. It decays inversely with the distance for short times due to the fermionic correlations in the initial state, which changes into a noninteger power law decay for late times, representing dissipation-induced Luttinger liquid behavior. However, the crossover between the two regions occurs due to dissipation-induced damping, and is unrelated to the propagation of excitations. The velocity of information spreading is set by the dissipative coupling, and differs significantly from the original sound velocity. The thermodynamic entropy grows as -t ln t initially, and saturates to an extensive value. Our results can be tested experimentally in one-dimensional Dirac systems.

Open Access: Yes

DOI: 10.1103/PhysRevLett.124.136401

Analysis of wind power generation potential and wind turbine installation economics: A correlation-based approach

Gusztáv Fekete Rohit Khargotra Vibha Yadav Tej Singh Amit Kumar Yadav Ujawal Kumar Adarsh Ranjan Talluru Sai Vinil Kumar

Publication Name: Results in Engineering

Publication Date: 2025-03-01

Volume: 25

Issue: Unknown

Page Range: Unknown

Description:

Wind energy production is rapidly expanding worldwide, yet studies on wind energy potential in India remain limited. This study evaluates the wind power potential and conducts an economic cost analysis of wind turbine generator installations at varying hub heights (10m to 150 m) across 21 locations in India, representing a novel contribution to the field. The selected locations include 11 sites in Gujarat (Location-1), 10 sites in Tamil Nadu (Location-2), and one site in Ravangla, Sikkim (Location-3). Cubic factors methods are implemented to estimate Weibull parameters. Results reveal that at 150 m hub height, wind power density ranges from 123.17 to 308.86 W/m² in Gujarat, 80.64 to 427.12 W/m² in Tamil Nadu, and 183.24 W/m² in Sikkim. Kaluneerkulam in Tamil Nadu demonstrates excellent wind category potential, with energy costs ranging from $0.0165 to $0.0076 per kWh, decreasing as hub height increases. Sites across all three locations exhibit moderate to steady wind speeds, making them suitable for wind energy exploitation. An economic analysis of nine wind turbine types shows that Tamil Nadu achieves the lowest energy cost variation, followed by Gujarat and Sikkim. This study provides valuable insights for optimizing wind energy utilization in India.

Open Access: Yes

DOI: 10.1016/j.rineng.2024.103743

Hungary

Bence Kas Zsuzsa Forró Krisztina Zajdó

Publication Name: Managing Children with Developmental Language Disorder Theory and Practice Across Europe and Beyond

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: 248-260

Description:

In the Hungarian education system, dividing children into separate groups on the basis of native language skills was first initiated in 1580 by school rector, pedagogue and evangelical priest, Pál Halvepápius, in Besztercebánya (Rosenauer, 1876). However, the foundations of speech communication have been a major interest even before that. Jesuit priest Pelbárt Temesvári (b.1435–d.1504) explored the anatomy and physiology of speech impediments in the sixteenth century and the history of the subject has remained very active ever since (Albert Szenczi Molnár, b.1574–d.1634, see Szenczi Molnár, 1610/1969; Farkas Kempelen (also known as Wolfgang von Kempelen), b.1734–d.1804, see Kempelen; 1791/1989).

Open Access: Yes

DOI: 10.4324/9780429455308