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Wyszukujesz frazę "ship logistics" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Research on the site selection and path layout of the logistics distribution center of marine ships based on a mathematical model
Autorzy:
Tong, Haolin
Powiązania:
https://bibliotekanauki.pl/articles/2173920.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
marine ships
distribution center
site selection
ship logistics
mathematical model
statki morskie
centrum dystrybucyjne
wybór lokalizacji
logistyka statków
model matematyczny
Opis:
For logistics enterprises, site selection and path layout are related to the cost and efficiency of distribution, which is a very critical issue and has an important impact on the development of enterprises. Compared with land logistics, the cost of marine ship logistics is higher due to the high cost of ships, so the research on the location and path layout of its distribution centers is also particularly important. This paper established a two-layer model under the assumption that unit transpor-tation costs and administration expenses are known for the site selection and path layout problems of marine ship logistics distribution centers. Corresponding constraint conditions were set. The upper layer was the optimization model of the site selection problem of the distribution center, and the objective function was to minimize operating and construction costs and was solved using the quantum particle swarm optimization (QPSO) algorithm. The lower layer was the optimization model of the distribution path layout, and the objective function was to minimize the logistics distribution cost and was solved using the ant colony optimization (ACO) algorithm. The model was verified through an example analysis. It was assumed that there were three ships, five candidate distribution centers, and ten customer points. The model was solved in MATLAB software. The results of the example analysis showed that compared with K-means, genetic algorithm (GA), and particle swarm optimization (PSO)-ACO algorithms, the QPSO-ACO algorithm had the shortest running time, about 60 s, which saved about 50% compared to the K-means algorithm. The optimal cost of the QPSO-ACO algorithm was 293,400 yuan, which was significantly lower than the K-means, GA, and PSO-ACO algorithms (459,600 yuan, 398,300 yuan, and 357,700 yuan). In this example, the site obtained by the QPSO-ACO algorithm was distribution center 2, and the obtained path distribution was 1-7-5-4, 2-6-3, and 10-8-9. The results verify the effectiveness of the QPSO-ACO algorithm in solving the problem of site selection and path layout. The QPSO-ACO algorithm can be applied in the actual marine ship logistics.
Źródło:
Archives of Transport; 2022, 63, 3; 23--34
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Greek army at Troy and its logistics. Based on the “Catalog of ships” called “Boeotia” from the second book of Homer’s Iliad
Autorzy:
Aksamitowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/9194667.pdf
Data publikacji:
2023-06
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Trojan War
Iliad
Odyssey
Ship Catalog
Piracy
Logistics
Opis:
The author showed a fragment of the Iliad referred to as the Catalogue of Ships, also called Beotia (Bojotia). The name of this part comes from the Beots, whose troops, arriving at Troy, were listed in the Catalogue as the first. The list contains in-formations about the Greek armed forces, rulers and chiefs of the Greek peoples who took part in the naval expedition and the war against the Trojans. It also determines the number of ships brought by the Greeks to Troy. Eager to go to war, they put themselves in Beocia near the city of Aulis where, on the Strait of Eurypus, a large port was located. It can also be assumed that the Catalogue of Greek troops begins with the army of Beocia because the ports of this land were chosen as the place of concentration of troops for the expedition against Troy. A collection of works called the Trojan Cycle was also characterized, which includes 29 books and from which only small fragments (epitomai) and summaries in the so-called Chrestomatia have survived. Despite such poor literature, they are an important source in reproducing the content of the Trojan cycle. The passage showing the Achaean army at Troy, which is a list of Greek nobility, is often omitted in the editions of the Iliad. However, for those studying the art of war, it is an extremely important record of Europe’s past.
Źródło:
Reality of Politics; 2023, 24; 7-27
2082-3959
Pojawia się w:
Reality of Politics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A container ship traffic model for simulation studies
Autorzy:
Wawrzyniak, Jakub
Drozdowski, Maciej
Sanlaville, Éric
Powiązania:
https://bibliotekanauki.pl/articles/2172133.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
benchmark instances
algorithm evaluation
data analysis
container ship
traffic modeling
marine logistics
instancje wzorcowe
ocena algorytmu
analiza danych
kontenerowiec
modelowanie ruchu
logistyka morska
Opis:
The aim of this paper is to develop a container ship traffic model for port simulation studies. Such a model is essential for terminal design analyses and testing the performance of optimization algorithms. This kind of studies requires accurate information about the ship stream to build test scenarios and benchmark instances. A statistical model of ship traffic is developed on the basis of container ship arrivals in eight world ports. The model provides three parameters of the arriving ships: ship size, arrival time and service time. The stream of ships is divided into classes according to vessel sizes. For each class, service time distributions and mixes of return time distributions are provided. A model of aperiodic arrivals is also proposed. Moreover, the results achieved are used to compare port specific features.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 4; 537--552
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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