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Found 6278 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

Modelling OCB and CWB by combined Fuzzy Signature model

Dalia Susniene Daiva Žostautienė Ojaras Purvinis László T. Kóczy

Publication Name: Economic Research Ekonomska Istrazivanja

Publication Date: 2021-01-01

Volume: 34

Issue: 1

Page Range: 1546-1565

Description:

Globalization and its challenges for organizations led to the understanding that employees can be a critical factor contributing to the organization’s performance. Therefore, various studies sought to understand employee’s behaviour that in itself encompasses various forms of engagement. One of the constructs defining engagement is citizenship behaviour (OCB) and counterproductive work behaviour (CWB). Based on previous researches, the study aims to contribute to the knowledge on the correlation between OCB and CWB considered as a behavioural engagement, from one side, and interplay of these constructs with the related constructs such as a trait engagement, perception of organization, state engagement, from another side. Since the empirical studies typically tend to concentrate on one or several factors separately, it is difficult to get a better understanding of relationship of all forms of engagement in corpore. To address this gap, we create a complex model of investigation developed to describe the linkage of the factors - OCB, CWB and related constructs under one umbrella and, by employing a combined statistical and Fuzzy Signature (FSig) model, we investigated the link with behavioural engagement. The present study covered one region of the northern part of Lithuania. It is based on 144 completed questionnaires from 35 companies. Findings support the assumption of the relationships of behavioural engagement (i.e. OCB and CWB) and the remaining multifaceted factors, and make a step forward by offering a new model for investigation the multifaceted phenomenon of employee engagement.

Open Access: Yes

DOI: 10.1080/1331677X.2020.1844581

Montelukast Improves Urinary Bladder Function After Complete Spinal Cord Injury in Rats

Peter Törzsök Lukas Lusuardi Sophina Bauer Karin Roider Julia Tevini Elena E. Keller Michael Kleindorfer Ludwig Aigner Thomas Felder

Publication Name: International Journal of Molecular Sciences

Publication Date: 2025-06-01

Volume: 26

Issue: 12

Page Range: Unknown

Description:

Bladder dysfunction is among the most drastic and quality-of-life-reducing conditions after spinal cord injury (SCI). Neuroinflammation in the lower urinary tract (LUT) after SCI could be a key driver of neurogenic bladder dysfunction and tissue fibrosis. Leukotrienes, a group of highly active lipid mediators, are potent inflammatory mediators. Here, we explored the potential of early montelukast (MLK) therapy, a cysteinyl leukotriene receptor 1 antagonist, on LUT function and structure four weeks after severe SCI in rats. Rats (strain Lewis, female, n = 50) received a permanent bladder catheter, followed by a complete T9 spinal cord transection. MLK was given daily, starting on day one post-injury. Bladder and locomotor function were regularly assessed. Bladder tissue was histologically and immunhistochemically analyzed. Post-SCI, MLK concentrations in plasma and cerebrospinal fluid were clinically relevant. MLK improved bladder functionality. MLK had no impact on smooth muscle alignment and uroepithelial integrity at this early SCI time point. This pilot study gave first insights into early, continuous oral MLK treatment with the first promising results of preserved LUT function and possible subsequent improved tissue integrity.

Open Access: Yes

DOI: 10.3390/ijms26125606

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

Ecological footprint at the micro-scale-how it can save costs: The case of ENPRO

Gabor Harangozo Cecília Szigeti Daniel Robert Szabo Gergely Toth

Publication Name: Resources

Publication Date: 2018-09-01

Volume: 7

Issue: 3

Page Range: Unknown

Description:

The Ecological Footprint (EF) has become a very popular alternative indicator of development in the last three decades. It can be widely used to show the unsustainability of total and individual levels of consumption in countries. But can EF be a meaningful indicator at the micro level as well This paper presents an argument on this issue. Based on a literature review including our own analysis and the correlation of EF with GDP and other alternative indicators, EF is evaluated at the macro level. Then, an original case study is presented, underpinning the applicability of EF on the company level, linking the ordinary corporate carbon footprinting with the EF method. Based on the findings, micro level EF calculations can help organizations in finding fields of intervention (inefficiencies and emission hotspots). EF accounting can also be used to evaluate the economic benefits of such measures after their realization.

Open Access: Yes

DOI: 10.3390/resources7030045

Algorithmic Management in Traditional Workplaces: The Case of High vs. Low Involvement Working Practices: The Context of the Non-Inclusive Industrial Relations System in Hungary

Laszlo Imre Komlosi Miklós Illéssy József Pap Éva Farkas Csaba Makó

Publication Name: Journal of Labor and Society

Publication Date: 2025-01-01

Volume: 28

Issue: 3

Page Range: 394-422

Description:

Algorithmic management (am) has become a key research focus in the sociology of work, especially concerning platform work. However, am tools are also impacting traditional workplaces. This study investigates three main questions: the impact of ai on high vs. low-skilled jobs, its effect on employee's role, and the formation of collective voices around am, including non-traditional labour relations actors. The context is the Hungarian industrial relations system, known for low union membership and company-level bargaining. The study compares two cases: a medium-sized company in high-value-added business services and a Hungarian subsidiary of a multinational employing warehouse workers. Contrary to literature suggesting am reduces employee autonomy, the study finds its impact complex, decreasing employee's roles some areas while increasing it in others. Notably, transparency and wage predictability improved. The study also highlights the importance of considering new actors, such as clients and external consultants, in am analysis. Keywords

Open Access: Yes

DOI: 10.1163/24714607-bja10182

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

Experimental comparison of field and accelerated random vertical vibration levels of stacked packages for small parcel delivery shipments

Péter Böröcz Bence Molnar

Publication Name: Applied Sciences Switzerland

Publication Date: 2021-04-01

Volume: 11

Issue: 7

Page Range: Unknown

Description:

In the last decade, there has been a significant increase in parcel delivery shipments all over the world due to online stores and consumer demand to receive the products in a shorter period of time. It is especially true when situations like COVID-19 limits personal purchases in shopping malls as well as grocery and pharmaceutical stores. This often means that courier operators try to deliver packages utilizing vehicles with racks or shelves, which during the COVID-19 epidemic are not there anymore. This study measured the vertical vibration levels that occur in stacked parcels during express delivery versus the simulation technique in the laboratory. The goal of this paper was to measure and compare the vibration levels between laboratory practice and field transportation. For the measurement a three-layer stacked unit was built to observe the vibration levels on different road conditions in a parcel delivery vehicle and ASTM vibration profile (ASTM International). Then the measured acceleration-time data were analyzed in terms of power spectral densities (PSD) and the presented statistical data provided an understanding of the variability of intensity in different levels in stacked unit. The results showed that the vibration level increases in the stacked load upwards and with worse road conditions, but even in the worst case it did not reach those vibration levels that the laboratory test showed. Moreover, the layers of the stacked unit are in out-of-phase motion in the field, while the stacked unit in the vibration simulation usually is in-phase motion. Results indicate that the proposed vibration simulation does not correlate well with typical field vibration. This is fundamentally true as during a forced vibration created by a single-axis shaker, do not account for additional inputs occurring simultaneously creating an off-balance to the loads and as a result are less severe than simulated conditions. These findings are limited to single axis vibration simulation and unsecured loads.

Open Access: Yes

DOI: 10.3390/app11072927

Investigation of glued insulated rail joints with special fiber-glass reinforced synthetic fishplates using in continuously welded tracks

Szabolcs Fischer Attila Németh

Publication Name: Pollack Periodica

Publication Date: 2018-08-01

Volume: 13

Issue: 2

Page Range: 77-86

Description:

In this paper the authors partially summarize the results of a research on glued insulated rail joints with fiber-glass reinforced plastic fishplates (brand: Apatech) related to own executed laboratory tests. The goal of the research is to investigate the application of this new type of glued insulated rail joint where the fishplates are manufactured at high pressure, regulated temperature, glass-fiber reinforced polymer composite plastic material. The usage of this kind of glued insulated rail joints is able to eliminate the electric fishplate circuit and early fatigue deflection and it can ensure the isolation of rails' ends from each other by aspect of electric conductivity.

Open Access: Yes

DOI: 10.1556/606.2018.13.2.8