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Wyświetlanie 1-3 z 3
Tytuł:
Spped as a vessel traffic optimization criterion
Autorzy:
Uchacz, W.
Powiązania:
https://bibliotekanauki.pl/articles/320593.pdf
Data publikacji:
2003
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
nawigacja
żegluga
bezpieczeństwo nawigacyjne
system kierowania ruchem statków
modele matematyczne
navigation
safety navigation
Vessel Traffic Management Services
mathematical model
Opis:
Problems of vessel traffic organization in approach channels are solved by Vessel Traffic Management Services (VTMS). One essential task for VTMS is to ensure a required level of traffic safety. As often vessel traffic is intensive, attempts are made to optimize it. This author aims to find a relevant solution based on a mathematical model, in which vessel speeds at particular fairway sections are varied. The model belongs to the class of mixed integer linear programming. The branch-and-bound method has been adapted to the proposed solution of the problem. The results are shown in tables, while certain aspects of solutions are illustrated graphically.
Źródło:
Annual of Navigation; 2003, 6; 103-115
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of vessel trafic using fuzzy linear programming
Autorzy:
Pietrzykowski, Z.
Uchacz, W.
Powiązania:
https://bibliotekanauki.pl/articles/320599.pdf
Data publikacji:
2003
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
nawigacja
żegluga
bezpieczeństwo nawigacyjne
programowanie liniowe
navigation
safety navigation
safety of ships
linear programming
Opis:
The optimisation of vessel traffic in narrow channels is concerned with the optimisation of vessel passage times with the regulations in force being complied with. These types of problems are normally solved by classical methods of linear programming. However, the implementation of solutions thus obtained is practically hardly feasible. This is due to difficulties in observing exact times of vessel entries into the fairway, maintaining exactly the expected times of passage along particular fairway sections. Therefore, it becomes necessary to account for inaccurate vessel entry and times of passing particular sections. Consequently, an optimisation problem in this context naturally fits in the format of problems of linear programming with fuzzy coefficients. This approach enables a more flexible formulation of an optimisation problem. From the point of view of the solutions obtained, the interpretation of fuzzy inequalities in the system of constraints is of much importance. The article presents solutions to the vessel traffic optimisation problem with the use of various interpretations of fuzzy inequalities. The calculation results are shown. These refer to vessel traffic in the Szczecin-Swinoujscie fairway. The results have been interpreted and conclusions have been drawn. INTRODUCTION
Źródło:
Annual of Navigation; 2003, 6; 65-79
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of navigators knowledge in an expert system for the evaluation of safety of a ship navigating in a restricted area
Autorzy:
Pietrzykowski, Z.
Uchacz, W.
Powiązania:
https://bibliotekanauki.pl/articles/320833.pdf
Data publikacji:
2000
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
nawigacja
systemy ekspertowe
navigation
expert systems
Opis:
This article presents possible applications and a methodology of creating an expert system for the evaluation of sailing ship safety in a restricted area that may be utilized by vessel traffic service (VTS) centres. Problems of acquisition of navigators’ knowledge relating to the evaluation of moving ship safety are discussed. The knowledge acquired has been implemented in an expert system with the NEXPERT OBJECT program – a tool of the shell type for building expert systems. Possible applications of this type of systems in VTS centres are indicated.
Źródło:
Annual of Navigation; 2000, 2; 99-114
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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