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001-es BibID:	BIBFORM064691
035-os BibID:	(Scopus)84975456024 (WOS)000381546900024
Első szerző:	Bai Attila (agrár-közgazdász)
Cím:	Technical and environmental effects of biodiesel use in local public transport / Attila Bai, Péter Jobbágy, József Popp, Ferenc Farkas, Gábor Grasselli, János Szendrei, Péter Balogh
Dátum:	2016
ISSN:	1361-9209
Megjegyzések:	Biodiesel use in local public transport could be especially significant in improving air quality in cities. The purpose of the experiments described in this paper was to evaluate the various (10, 20 and 50%) blends of biodiesel with diesel in the context of the engine and pollution aspects. As regards the experimental use of these findings on municipal buses, these experiments were the first reference in Hungary. The ages (15-20 years) and types of buses (Ikarus-280, Ikarus-260) used in the experiments are still common vehicles in Hungarian public transport. During our measurements, there was a significant difference between the change in fuel consumption of articulated and solo buses in traffic when compared to test bench measurements. The proportion of the engine performance reduction is nearly the same as that for biodiesel share in the blends. Most pollutants were decreasing (both at idle and full rpm), but this reduction is not directly proportional to the increase of the blending percentage. However, as for CO2, emission increase was observed in the case of idle rpm in comparison to normal diesel operation, even though this phenomenon was not due to biodiesel use, but the catalytic converter and the fact that biodiesel was used for the first time in the engine concerned.
Tárgyszavak:	Műszaki tudományok Agrárműszaki tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Transportation Research Part D : Transport and Environment. - 47 (2016), p. 323-335. -
További szerzők:	Jobbágy Péter (1985-) (gazdasági agrármérnök) Popp József (1955-) (közgazdász) Farkas Ferenc (mérnök) Grasselli Gábor (1947-) (agrár-műszaki) Szendrei János (1977-) (agrármérnök) Balogh Péter (1970-) (agrármérnök)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM101696
035-os BibID:	(Scopus)85130388120 (WOS)000795560900001
Első szerző:	Le Thi Diem Chau (PhD hallgató)
Cím:	Clustering algorithm for a vehicle routing problem with time windows / Thi Diem Chau Le, Duc Duy Nguyen, Judit Oláh, Miklós Pakurár
Dátum:	2022
ISSN:	1648-4142 1648-3480
Megjegyzések:	The demand for daily food purchases has increased dramatically, especially during the Covid-19 pandemic. This requires suppliers to face a huge and complex problem of delivering products that meet the needs of their customers on a daily basis. It also puts great pressure on managers on how to make day-to-day decisions quickly and efficiently to both satisfy customer requirements and satisfy capacity constraints. This study proposes a combination of the cluster-first ??? route-second method and k-means clustering algorithm to deal with a large Vehicle Routing Problem with Time Windows (VRPTW) in the logistics and transportation field. The purpose of this research is to assist decision-makers to make quick and efficient decisions, based on optimal costs, the number of vehicles, delivery time, and truck capacity efficiency. A distribution system of perishable goods in Vietnam is used as a case study to illustrate the effectiveness of our mathematical model. In particular, perishable goods include fresh products of fish, chicken, beef, and pork. These products are packed in different sizes and transferred by vehicles with 1000 kg capacity. Besides, they are delivered from a depot to the main 39 customers of the company with arrival times following customers??? time window. All of the data are collected from a logistics company in Ho Chi Minh city (Vietnam). The result shows that the application of the clustering algorithm reduces the time for finding the optimal solutions. Especially, it only takes an average of 0.36 s to provide an optimal solution to a large Vehicle Routing Problem (VRP) with 39 nodes. In addition, the number of trucks, their operating costs, and their utilization are also shown fully. The logistics company needs 11 trucks to deliver their products to 39 customers. The utilization of each truck is more than 70%. This operation takes the total costs of 6586215.32 VND (Vietnamese Dong), of which, the transportation cost is 1086215.32 VND. This research mainly contributes an effective method for enterprises to quickly find the optimal solution to the problem of product supply.
Tárgyszavak:	Társadalomtudományok Gazdálkodás- és szervezéstudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Transport. - 37 : 1 (2022), p. 17-27. -
További szerzők:	Duy Duc Nguyen (közgazdász) Oláh Judit (1973-) (agrárközgazdász, logisztika) Pakurár Miklós (1959-) (agrárökonómus)
Pályázati támogatás:	EFOP-3.6.3-VEKOP-16-2017-00007 EFOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM096025
Első szerző:	Oláh Judit (agrárközgazdász, logisztika)
Cím:	Evolution of Freight Villages and Dry Ports from the Macro Logistics Perspective Based on European Benchmarking 2020 / Judit Oláh, Steffen Nestler, Thomas Nobel, József Popp
Dátum:	2021
ISSN:	0303-7800
Megjegyzések:	Being the initiator of the German and European Freight Village ranking, Deutsche GVZ-Gesellschaft (DGG) has the methodical know how to create the benchmarking studies. In this ranking approximately 100 Freight Village locations were analysed and evaluated. The research was based on the generation of an uniform understanding, which was focused on intermodality and the significant distinctive management structures. This data led to a qualitative and detailed overview. Because of the positive response, we were motivated to start the second ranking in 2015, as well as the update in 2019/2020. The results of the ranking show important basics and facts, which demonstrate the importance of the Freight Villages and strengthened their role as central, intermodal logistics nodes. Moreover, the responsible decision makers in the Freight Villages benefit from the results of the benchmarking. Many management companies use their placement in the ranking for public relations activities. Good placements or improvements are important instruments in marketing strategies.
Tárgyszavak:	Társadalomtudományok Gazdálkodás- és szervezéstudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk
Megjelenés:	Periodica Polytechnica Transportation Engineering. - (2021), p. 1-12. -
További szerzők:	Nestler, Steffen (közgazdász) Nobel, Thomas (közgazdász) Popp József (1955-) (közgazdász)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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