Mathematical models and numerical algorithms for the efficient activity of Constanța Sea Port
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StatusThe thesis was presented on the 21 December, 2016Approved by NCAA on the 16 February, 2017 Abstract – 0.71 Mb / in romanianThesisCZU
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Keywords
Laplace-Stieltjes transform, generalized waiting models, waiting time, random variables, queuing theory, maritime port.Summary
Field of study of the thesis: The Theory of waiting systems
The purpose and objectives of the work. Because of the rapid development of Constanța Sea Port, as well as of systems, the need for applying upgraded waiting systems requiring the creation of new mathematical waiting models has appeared. The thesis aims at expanding the results already known in terms of the queuing theory and at developing mathematical algorithms to streamline the waiting time in a marine terminal, all that leading both to lowering the waiting time and to reducing the costs within the entire port activity. The following objectives of the work have been browsed in order to achieve its purpose: - the presentation of several mathematical models that can be applied in the activity of Constanța Sea Port;
- the analysis of distribution functions from several mathematical models;
- the determination with the help of calculating methods, of the most efficient distribution function which can be applied in the port activity;
- the presentation and analysis of two maritime terminals in the port of Constanta;
- the development of an algorithm in C ++ for optimizing the waiting time within the waiting model M/G/1 conducted for several distribution functions;
- the description of the algorithm developed to estimate the parameters of the distribution functions that occur in optimizing the waiting time of a ship in the maritime terminals.
The scientific novelty and originality of the thesis lie in generalization and descrition of several mathematical models. Moreover were analyzed several key functions for each model, the application of these results leading to the elaboration of algorithms for four key functions. Have been described and analysed within the newsletters of two maritime terminals in the port of Constanța. As a result of such analysis and in accordance both with mathematical models, but also in the light of their key functions we could make it possible to implement in the future of this mathematical calculation algorithm.
The important scientific problem solved lies in establishing smaller waiting times of ships in the sea terminals, results obtained from the analysis of waiting models and also of distribution functions for these models.
The theoretical significance. The results presented in this thesis may serve as a basis for further research and scientific study of the determination of other probabilistic features for different models for waiting.
Applicative value of the work. The results obtained can be applied in the port systems can be extended for loading cargo on various types of ships (container, tank, etc.), which can be modeled mathematically with the help of the models studied in this thesis.
The implementation of the scientific results. The developed algorithms were implemented as software program in the programming language C ++.
Oficial Reviewers
- Andrei Poştaru
doctor, associate professor (docent) - CONSTANTINESCU Eliodor Mihail
doctor în matematică, profesor universitar,, Universitatea Maritimă din Constanța
Council's Members
- Sergiu Cataranciuc, president
doctor habilitat, professor, Moldova State University - Boris Hâncu, secretary
doctor, associate professor (docent), Moldova State University - Dumitru Lozovanu, member
doctor habilitat, professor, Moldova State University - Dumitru Solomon, member
doctor habilitat, associate professor (docent), Moldova State University - Emilian Guţuleac, member
doctor habilitat, professor, Technical University of Moldova - MEMET Florența
doctor în matematică, lector universitar, Universitatea Maritimă din Constanța
Theses
