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Publications - 6374

Trade-offs in warehousing storage location reassignment

Peter Foldesi Tamás Bódis Polina Görbe

Publication Name: International Journal of Logistics Systems and Management

Publication Date: 2025-01-01

Volume: 51

Issue: 4

Page Range: 524-538

Description:

In the low-level picker-to-parts warehouses the order picking is the most time- and cost consuming process. The performance indicator for order picking is lead time. The system can be considered efficient if these lead times can be kept low, but this is heavily influenced by the storage location assignment in the warehouse, the routing, and the warehouse layout. The objective of this research is to investigate in what cases and to what extent reassignment and repositioning tasks following efficiency deterioration as well as seek answers to how to minimise these costly tasks and maintain a near-ideal storage location assignment. To solve this problem, an intelligent system concept is presented, which aims to support the warehouse operator in making replenishment decisions, which picking storage to replenish based on the current rotation of item, and which products to repositioning, while maintaining a near ideal storage location assignment. The aim of this paper is to highlight the potential decision points and circumstances, when adaptive storage location reassignment would be necessary and how this concept can help everyday warehouse logistics.

Open Access: Yes

DOI: 10.1504/IJLSM.2025.148067

Examination of online education experiences from stakeholder perspective a Hungarian case study

Peter Foldesi Orsolya Putz Boglárka Eisingerné Balassa László Buics Zsolt Csaba Horváth Zoltán Varjú

Publication Name: International Conference on Higher Education Advances

Publication Date: 2022-01-01

Volume: 2022-June

Issue: Unknown

Page Range: 159-167

Description:

With the rise of Covid-19, higher education has undergone a major transformation. Prior to the pandemic, many universities offered online courses, but the majority of universities were characterized by face-To-face teaching. The goal of this research is to find out students' and teachers' opinions on the online education introduced in the first phase of Covid, with the help of a survey. As teachers had to react very quickly to the situation, the research would like to assess what worked well and what didn't during the online education period, what is in the focus of positive and negative opinions. The aim of this survey is to get feedback from students and faculty members regarding their experiences with online education during Covid.

Open Access: Yes

DOI: 10.4995/HEAd22.2022.14601

Analysis of stress-strain state changes in railway tracks during transition to European gauge

Szabolcs Fischer Mykola Kurhan Dmytro Kurhan Nelya Hmelevska

Publication Name: Iop Conference Series Earth and Environmental Science

Publication Date: 2024-01-01

Volume: 1348

Issue: 1

Page Range: Unknown

Description:

The geographical location of Ukraine facilitates its integration into the transportation network connecting European countries. Various options exist for transitioning from the gauge of 1 520 mm to the European standard gauge of 1 435 mm. This paper aims to analyze the changes in the stress-strain state of railway track elements during the reconstruction of existing sections from the 1 520 mm gauge to the 1 435 mm European gauge or to a dual gauge of 1 435/1 520 mm. To perform these calculations, a spatial model of dynamic deformations in the railway track is employed, based on the principles of elasticity theory. The implementation of a combined railway track complicates the stress state of the ballast layer, leading to asymmetric stresses along the length of the sleepers, which vary depending on the track on which trains operate. There is also a redistribution of stresses acting on the ground structure, which has been in operation for many years. The research results identify changes in the stress-strain state of the railway track and can be used to justify measures for the appropriate reinforcement of the ballast layer and the ground structure.

Open Access: Yes

DOI: 10.1088/1755-1315/1348/1/012029

The Impact of Workplace Narratives on Organizational Behaviour – A Systematic Literature Review

László Buics Anikó Makkos Veronika Nagy

Publication Name: International Scientific Business Conference Limen Leadership Innovation Management and Economics Integrated Politics of Research

Publication Date: 2024-01-01

Volume: 2024

Issue: Unknown

Page Range: Unknown

Description:

Narratives and the behaviours they support play a key role in shaping the workplace climate. The positive effects — for example, building team cohesion through leadership narratives — increase employee morale and performance, while the negative effects — for example, caused by ineffective leadership communication — decrease loyalty and work performance. The purpose of this article is to examine the impact of narratives, leadership communication, and communities of practice (CoPs) on organisational climate. The importance of CoPs is highlighted: these formal or informal communities are a breeding ground for organisational innovation and positive behaviours. Trust as a key factor is also examined, as it is particularly important in vertical and horizontal communication. The article applies the PRISMA methodology and the PEO framework to conduct a systematic literature review in the Scopus database to collect data and present the currently available knowledge in the field.

Open Access: Yes

DOI: 10.31410/LIMEN.S.P.2024.1

Investigation of mixing processes of polymer composites

Ferenc Ronkay E. Sági Gabor Dogossy

Publication Name: Materials Science Forum

Publication Date: 2013-01-01

Volume: 729

Issue: Unknown

Page Range: 332-337

Description:

Three ultrahigh molecular weight polyethylene (UHMWPE) composites of differing composition, reinforced with multiwalled carbon nanotubes (MWCNT) were prepared. The homogeneous distribution of MWCNT has been attempted by two dry blending methods and one melt-mixing process. The efficiency of the various methods was characterized by their effects on the quasi-static and dynamic physical properties of the composites. In the case of composites manufactured by ball milling the effects of various adhesion promoter additives (compatibilizers) has also been studied by analyzing the tensile, flexural, Charpy impact and wear properties of the composites. © (2013) Trans Tech Publications, Switzerland.

Open Access: Yes

DOI: 10.4028/www.scientific.net/MSF.729.332

Evaluation of trace metal levels in surface water and sediments of the Hungarian upper section of the Danube River and its tributaries

István Vass Andrea Szabó Nagy János Szabó

Publication Name: Journal of Environmental Science and Health Part A Toxic Hazardous Substances and Environmental Engineering

Publication Date: 2016-12-05

Volume: 51

Issue: 14

Page Range: 1248-1261

Description:

The objective of this study was to assess the concentration levels of trace metals (Zn, Hg, Cd, Cr, Ni, Pb and Cu) in surface water and bottom sediments of the Hungarian upper section of the Danube River and its main tributaries. A total of 935 samples (water and sediments) were collected from 10 different sampling sites in the period of 2001–2012 and analyzed for the trace metals. Moreover, the dissolved arsenic content was determined in a number of 467 water samples in the period of 2004–2012. The highest dissolved trace element concentrations were observed at the site of Kenyérmezei-patak Creek located near a hazardous waste incinerator. However, the comparison of the dissolved trace metal(loid) concentrations determined with other sections of the Danube River and the European Union environmental quality standards revealed that the dissolved trace metal(loid) concentrations were relatively low in the Hungarian upper section during the 12-year study period (excluding some samples for Hg, Cd and Cr). The concentrations of trace metals in sediments were higher than those found in water samples and varied very much in all sampling sites during the study period. The sediment samples were mainly classified as low or moderate polluted for trace metals. However, some sediment samples collected especially from the Moson Danube branch indicated a considerable (for Zn, Hg, Cd, Ni and Cu) or a very high (for Zn and Hg) contamination.

Open Access: Yes

DOI: 10.1080/10934529.2016.1212565

Evaluating condition of buildings by applying fuzzy signatures and R-fuzzy operations

Adam Bukovics Laszlo T. Koczy

Publication Name: Studies in Computational Intelligence

Publication Date: 2014-02-03

Volume: 530

Issue: Unknown

Page Range: 45-57

Description:

It is an significant task to qualify and rank residential buildings based on various priority aspects and to make optimum allocation of the material resources available for the renewal of the buildings.To this end a model based on fuzzy logic was prepared. To construct and to test this model many detailed technical-static expert reports were available all related to a stock of residential buildings in Budapest. Based on this report a database was created. With the help of this database a model was prepared, calculating a so-called status characteristic value between 0 and 1 on the basis of the structures and status of the buildings. For this calculation a fuzzy singleton signature model was prepared. Based on this a hierarchy can be set up related to the stock of buildings, which is suitable for supporting the decision making on intervention. The model was examined by using the created database. Membership values characterising the status of the load-bearing structures-were defined on the basis of the deterioration of the structures. In this chapter a new method for the determination of the membership values is described, which in addition to the deteriorations of the structures takes into account other parameters of the structures, and the impact exerted on the quality of the structure, too. The method is suitable for the determination of the membership values of all primary and secondary structures. As an example the membership values of the foundation structures of the buildings in the database were defined and the results were analysed. The method was elaborated by the use of "real fuzzy values" (R-fuzzy sets), an extension of the concept of classic fuzzy sets, the former being suitable for simultaneously taking into account various aspects. © Springer International Publishing Switzerland 2014.

Open Access: Yes

DOI: 10.1007/978-3-319-03206-1_4

Forest Fires and Their Impact on Hungary’s 2050 Climate Goals

Botond Géza Kálmán Valéria Limpók

Publication Name: Ecocycles

Publication Date: 2026-01-07

Volume: 11

Issue: 2

Page Range: 105-110

Description:

Forest fires are gaining attention as a climate issue because they release greenhouse gases—mainly CO2—and because the forests that burn lose their ability to store carbon. In Hungary, the direct CO2 emissions from forest fires make up only about 0.29% of the country’s yearly emissions, but they still matter in the bigger climate picture. However, the long-term cumulative impact, the high emission rate per hectare and the resulting reduction in CO2 removal capacity are strategically important issues in achieving the 2050 climate neutrality goals. This research fills a research gap. It provides a quantitative analysis of forest fire emissions and removal losses using data from the European Forest Fire Information System (EFFIS) and national forestry statistics. The total CO2-related climate burden is projected to be approximately 4,300 kt by 2050. Despite modest absolute values, forest fires represent an under-recognized but growing risk in national climate planning. The results support the need for long-term policy integration of fire mitigation, afforestation and forest management strategies. This study provides a replicable methodology and practical knowledge for shaping climate policy in smaller EU Member States.

Open Access: Yes

DOI: 10.19040/ecocycles.v11i2.642

TESTING THE FRAGMENTATION OF RAILWAY BALLAST MATERIAL BY LABORATORY METHODS USING PROCTOR COMPACTOR

Szabolcs Fischer Mykola Sysyn Attila Németh Jianxing Liu Erika Juhasz Gusztáv Baranyai

Publication Name: Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu

Publication Date: 2024-01-01

Volume: Unknown

Issue: 1

Page Range: 58-68

Description:

The physical classification of crushed stone and gravel used in railway construction is based on their strength and endurance and is performed by a laboratory test method using a rotating drum or a mortar method. The values of fracture resistance calculated using the Los Angeles method and abrasion calculated using the Micro-Deval method show a corresponding correlation and require further investigation. Purpose. The development of a new method for measuring rock material fracture that is consistent with widely used standards while also being more comparable to real-world railway operating conditions. Certainly, both standard tests are essential for ensuring product homogeneity during production, so the new recommended method is only a supplement. Methodology. The Proctor device was used to induce so-called shock loads from above, similar to railway loading conditions. Unlike the standard method, the andesite material was placed in a standard cylinder in these tests. The samples were pre-screened and sorted; the specified weight was approximately 1,300 g, and the specified sizes of the individual particles were 6.3, 8.0 and 11.2 mm. Only prewashed and dried materials of NZ (fine crushed stone) or KZ (special crushed stone) from four different quarries (Tállya, Szob, Nógrádkövesd, Recsk) with different rock physics characteristics were considered. The Proctor compactor machine was used because of its calculable labor (19.86 J/impact) and the crushing effect of the calculable impacts (64, 128, 256 and 1,028 blows). Even after loading different numbers of impacts, homogeneous samples from different quarries were sieved to measure the masses of fragments per fraction. Findings. The set of measurements made it possible to establish a series of fragmentation and degradation curves for each of the three repeated measurements based on the composition of the material and the number of blows, which showed the degradation of samples with different physical and mechanical properties of the rock material and particle sizes. With an increasing number of impacts, the amount of crushed material in the sample increased, but the distribution of crushed material did not decrease evenly and proportionally as the number of impacts increased. Parameters and indices were also computed to identify various correlations (i. e., FV, d < 22.4, d < 0.5, d < 0.063 mm, CU, M ratio, λ ratio). Some of them (e. g., FV) needed to be changed, but they were predefined due to the nature of the tests. Originality. While many standard and alternative railway track ballast fragmentation test methods and measurement tools are available, this paper proposes a new laboratory method and demonstrates the specific measurement and application effectiveness. Practical value. In addition to standard tests that are already widely used, the new method for measuring the fractional composition of railway ballast can help simulate real-world operating conditions of a railroad track in the laboratory. This method will improve the safety of railway operations.

Open Access: Yes

DOI: 10.33271/nvngu/2024-1/058