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    Wyświetlanie 1-7 z 7
    Tytuł:
    Bi-directional search in route planning in navigation
    Autorzy:
    Dramski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/360091.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    shortest path
    safe route
    restricted area
    bi-directional search
    Dijkstra algorithm
    Opis:
    The shortest path problem is one of the most significant ones in the field of maritime navigation. One of the most efficient algorithms was proposed by E. Dijkstra in 1959. Taking into account the development of computer technology was offered another interesting approach to the issue. The main idea is to execute the shortest path algorithm simultaneously forward from the source and backward from the target. The results are presented and discussed.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 39 (111); 57-62
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bi-objective maritime route planning in pirate-infested waters
    Autorzy:
    Vaňek, O.
    Hrstka, O.
    Kopřiva, Š.
    Faigl, J.
    Pěchouček, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/906066.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    maritime piracy
    risk-aware planning
    optimization
    risk analysis
    modeling
    FTA
    Opis:
    Contemporary maritime shipping is subject to a large number of constraints given by tight shipping schedules and very low margins. Additionally, problematic areas with increased security needs dynamically changing in time, combined with seasonal oceanographic and meteorological conditions pose a challenging voyage planning problem. In this work we present a risk-aware voyage planner taking into account spatio-temporal environmental conditions. The planner is based on a graph-based search algorithm A* . We discretize the required area into a graph, we store various layers of information into the edges of the graph (such as risk and weather conditions) in a form of numeric weights and we define a bi-objective planning problem with a tradeoff between security and duration of the voyage. The nature of the algorithm guarantees a complete and optimal solution in a form of an optimized voyage with respect to the criterion function composed of the two weighted components, i.e, duration and security of the voyage. We demonstrate the approach on our area of interest: Indian Ocean. We use NATO piracy activity risk surface as the risk layer and we compute all transit voyages between relevant routing points in the area. Finally, thanks to the discretization of the problem, we are able to integrate corridors imposed by the shipping authorities and evaluate additional what-if scenarios with extended corridor systems. The resulting planner is exposed to the public using a web service with an easy interface requiring start time of the voyage and the origin and the destination point of voyage. Combined with an expressive visualization, this tool demonstrates the capabilities of the proposed solution.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 43 (115); 115-124
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The idea of using the A* algorithm for route planning an unmanned vehicle “Edredon”
    Autorzy:
    Naus, K.
    Wąż, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/359690.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    A* algorithm
    navigation system
    route planning
    electronic chart
    vehicle „Edredon”
    Opis:
    This article presents the concept of algorithm A* functioning in a navigation system equipped with electronic navigational chart for autonomous planning the shortest and safest route crossing an offshore unmanned vehicle “Edredon”. The first part describes the general technical architecture and functionality of the vehicle's navigation system. In the second part shows in detail the modules of the system responsible for the planning of the road and how to implement them in the A* algorithm. The third part describes the proper operation of testing whether the A* algorithm in the navigation system, while the task of planning the route of the autonomous vehicle. Final part is a discussion of the results obtained from tests carried out in order to evaluate the applicability of the A* algorithm for route planning in autonomous navigation systems.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 2; 143-147
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problems of sea route planning for a ship operating in piracy-threatened areas: the Indian Ocean
    Problemy wyboru drogi morskiej statku operującego na akwenach zagrożonych atakami pirackimi na przykładzie Oceanu Indyjskiego
    Autorzy:
    Wiśniewski, B.
    Siódmak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/359986.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    planowanie podróży statku
    piraci
    route planning
    pirates
    Opis:
    One of the essential issues in the multi-criteria process of voyage planning is the safety of personnel, cargo and the ship itself, accounting for the optimized voyage time and costs. Apart from sometimes difficult weather and navigational conditions, pirates have been a new major threat to the safety of navigation since the beginning of this century. It is because of piracy, traditional routes of vessels differ from seasonal ones, and their threat is taken into consideration in decisions concerning the choice of the sea route of a ship. This article indicates the most dangerous routes in terms of pirate attacks occurrence over the last few years in the Indian Ocean. An attempt is made to relate the number of pirate attacks to hydrometeorological conditions and to define the effect of pirates activities on the problems of choosing the vessel sea route.
    W wielokryterialnym procesie planowania podroży statku jednym z najważniejszych zagadnień jest bezpieczeństwo znajdujących się na nim ludzi, ładunku i samego statku przy jednoczesnej optymalizacji czasu i kosztów podróży. Od kilku lat bezpieczeństwu nawigacji obok warunków pogodowych i nawigacyjnych zaczęli zagrażać piraci, którzy stali się głównym niebezpieczeństwem nawigacji początku XXI w. Właśnie ze względu na nich, dotychczasowe trasy statków odbiegają od sezonowych, a zagrożenie, jakie niosą, uwzględnia się w procesie decyzyjnym wyboru drogi morskiej statku. W artykule wskazano najbardziej niebezpieczne obszary pod względem występowania ataków pirackich w ostatnich latach na przykładzie Oceanu Indyjskiego. Dokonano próby powiązania liczby ataków pirackich z warunkami hydrometeorologicznymi, wskazując jednocześnie na wpływ aktywności piratów na problemy wyboru drogi morskiej statku.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2011, 26 (98); 114-119
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Navigation infrastructure of the Northern Sea Route
    Autorzy:
    Pastusiak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/135311.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    Northern Sea Route
    navigation infrastructure
    voyage planning
    Aids to Navigation
    quality assessment
    radio-navigational systems
    Opis:
    The reduction of sea ice area in the Arctic has increased the availability of the Russian Arctic seas for navigation by vessels of relatively low ice class. The signing of the Act on the Northern Sea Route (NSR) by the President of the Russian Federation has created the possibility for ships from countries other than Russia to use the NSR. However, the NSR is very poorly recognized in terms of navigation by countries other than Russia. The author of the paper analyzed the NSR navigation infrastructure components in terms of the reliability of the information provided by the main producers of nautical publications for initial voyage planning. For the purpose of this analysis an indicator of the quality of the navigation infrastructure was developed. The value of this indicator, obtained on the basis of the above analysis, is low. Navigators that collect information during the initial stage of voyage planning may be misled if they use nautical publications originating from only one global producer of charts and publications. If the navigators act in accordance with good seamanship and familiarize themselves with information from two or three global producers of nautical publications, they may be disoriented due to the receipt of divergent information. It seems that before the voyage begins and preferably before planning a trip, the master or owner of the vessel intending to carry out a voyage by the NSR should first use the most current local knowledge in the possession of the Northern Sea Route Administration. This is also where information can be found as to where to obtain the most current and reliable information for initial voyage planning.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 74-82
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Route prediction for a person in water drifting in chosen basins using graph theory
    Autorzy:
    Kijewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/135003.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    route prediction
    trajectory prediction
    object movement
    search planning
    survivor
    person in water
    search and rescue
    graph theory
    Opis:
    In this paper, the route prediction for a person in water was performed on the basis of a developed graph algorithm. This person drifted in water under the influence of surface currents and wind. The total drift route for the person in water was established as the route in a weighted directed graph. Vertices of this graph correspond to given points within a given basin. Additionally, the graph’s edges show possible directions of the overall human drift. The weight of the given edge describes the difference between the gradient of the edge and the total drift direction calculated on the basis of surface current field data and wind field data. An application has been created on the basis of a given algorithm which might be used to support the search for survivors in coastal areas (e.g. port basins, basins adjacent to the port, bays and sea areas) for which hydrodynamic models reliably reflect local phenomena.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 50 (122); 45-51
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Bon Voyage 7.0 (AWT) to programming of an ocean route of post-Panamax container vessel in transpacific voyage Seattle – Pusan 26.08.2015, 1600UTC – 05.09.2015, 2100UTC
    Autorzy:
    Szymański, M.
    Wiśniewski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/135418.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    ocean voyage route optimization
    ocean voyage route programming
    voyage planning
    Bon Voyage system
    fuel criterion
    ECA
    Opis:
    The results of testing the Bon Voyage system for an ocean voyage are presented in this paper. The main assumptions of testing were: ETD – 26.08.2016 and ETA – 05.09.2016, as established by the owner. All the data have been obtained from an actual voyage of a post-Panamax shipping container through the North Pacific. Testing was repeated again after completion of the voyage (post-voyage analysis). The data indicate that improved results with respect to fuel consumption could have been achieved using a different moment of second stage testing. Possible problems at planning, programming, and optimizing of the route leading through the ECA (Emission Control Area) zones with the use of onboard routing systems are also presented.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 48 (120); 182-186
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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