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The reloading of a ship in a maritime container terminal as a queuing problem of interacting processes

100%
BARTOSIEWICZ A., KUCHARSKI A.
Operations Research and Decisions
|
2024
|
vol. 34
|
issue 1
17-33
EN
In this work, we propose a multi-server queuing system for modeling the processes that occur in a maritime container terminal. In our study, the main operations that take place at the quay and in the yard are first disaggregated into several elementary activities. Then we propose the step-by-step calculation of the times of each operation that influences both the unloading and the loading of a container. Next, we analyze the vessel cycle time while separately investigating the STS (ship to shore) crane cycle time, the RTG (rubber tyred gantry) cycle time, as well as the IMV (internal movement vehicle) transfer time. Finally, we apply two process-driven simulation experiments to the system analysis. The paper demonstrates the proposed model’s effectiveness with data from the BCT Gdynia container terminal. We show that, among others, even with properly planned work of STS cranes and RTGs, there is still a high probability that the quay will become a bottleneck of the described processes.
2
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MODELLING OF THE OPERATION OF THE MULTI-STOREY AUTOMATED GARAGE WITH A BIG CAPACITY

75%
Pypno C., Sierpiński G.
LogForum
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2013
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vol. 9
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issue 3
199-208
EN
Background: The paper presents the issues of parking in the cities. The idea of multi-storey, overground garage with the capacity of 400 cars per hour has been proposed in the paper. The main focus is on analyzing loading and unloading as well as trans-shipment of the cars on the storeys of the garage. Methods: The queuing theory has been used in the modelling process of the vehicles operation. The theory may enable to draw up general methods which let us indicate basic factors describing the process of the operation and the evaluation of the quality of work of the queuing theory system. Aims: The subject of the paper is to check the influence of stochastic effects on the effectiveness of the parking operation in multi-storey garage. Conclusions: The garage could be a solution to parking problems in the city centres, in the vicinity of factories, office buildings, academic centres and the like. Furthermore the research method may support and speed up a decisional process while choosing the optimal structure, organization and first of all the construction of the parking.
PL
Wstęp: Artykuł dotyczy problematyki parkowania w miastach. Zaproponowano koncepcję projektu wielokondygnacyjnego nadziemnego garażu o przepustowości 400 samochodów na godzinę. Skupiono się na analizie systemu załadunku, rozładunku oraz na analizie systemów przeładunku samochodów na kondygnacjach garażu. Metody: Do modelowania procesów obsługi pojazdów zaproponowano użycie teorii kolejek, która może pozwolić na opracowanie ogólnych metod umożliwiających wyznaczenie podstawowych wskaźników charakteryzujących proces obsługi i ocenę jakości pracy systemu kolejkowego. Cele: Celem artykułu było zbadanie zjawisk stochastycznych na efektywność obsługi garażu wielokondycyjnego. Wnioski: Opisany garaż byłby rozwiązaniem problemów z szybkim parkowaniem samochodów w centrach miast, obok fabryk, dużych biurowców, uczelni itp. W dalszej pracy wskazana metoda badawcza może wspomagać proces decyzyjny dotyczący wyboru optymalnej struktury i organizacji obsługi, a przede wszystkim wybór konstrukcji parkingu.
3
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Program for Modelling Queuing Systems in Transport

63%
Dimitrov S.
Logistics and Transport
|
2012
|
vol. 15
85-90
EN
This paper presents an example application of a software program developed using the programming language VBA and designed for modelling queuing systems in the field of transport. The program enables users to quantitatively determine the indicators of the queuing systems. In order to show the program’s capabilities and how it can be used, two scenarios have been considered - modelling single-server and multi-server queuing systems of type M/M/1 and M/M/S, respectively, having a Poisson incoming flow of requests and exponentially distributed service times.
4
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Metody zarządzania zasobami na przykładzie służby zdrowia

45%
UZIAŁKO J., RADOSIŃSKI E.
Operations Research and Decisions
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2009
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vol. 19
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issue 1
121-142
PL
W artykule przedstawiono i zanalizowano problem zarządzania zasobami w służbie zdrowia. Omówiono podstawowe zagadnienia w procesie alokacji zasobów medycznych. Zaprezentowano przykłady zastosowania wybranych metod: programowania matematycznego (liniowego, całkowitoliczbowego, celowego, sieciowego), teorii kolejek, modelowania symulacyjnego, systemów hybrydowych oraz standardowych metod kosztowo-efektywnościowych do analizy zagadnień, związanych z podziałem zasobów w systemach opieki zdrowotnej. Przedyskutowano użyteczność tych metod do rozwiązywania szczegółowych problemów dotyczących zarządzania zasobami medycznymi.
EN
Various issues referring to general problems of resource allocation in the area of healthcare were discussed in the article. Fundamental questions regarding the process of allocating healthcare resources were pointed out. The topics were presented according to the categories of methods used to potentially solve these problems. The following approaches were considered: chosen methods of mathematical programming, queuing theory, simulation, hybrid algorithms combining, among others, artificial intelligence and other techniques, as well as standard cost-effectiveness methods. Such methods were applied to the following problems: analyzing the current state of health care units and presenting proposals of changes to such systems. The modifications suggested referred to: allocation of material resources, planning the work schedules of medical personnel and patient admission. The question of determining the effectiveness of various medical strategies was also discussed. The article clearly underlined the importance and complexity of the problem of managing healthcare resources.
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