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    Wyświetlanie 1-8 z 8
    Tytuł:
    A Clustering Analysis for Identifying Areas of Collision Risk in Restricted Waters
    Autorzy:
    Xiang, Z.
    Hu, Q.
    Shi, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116062.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    anticollision
    restricted waters
    ship domain
    Opis:
    The identification of areas of collision risk in restricted waters could play an important role in VTS services. Based on the concept of ship domain, this paper introduces a model for identifying collision risk between vessels in restricted waters, then puts forward an improved DBSCAN clustering algorithm for identifying areas of high collision risk, finally, the visualization algorithm is presented. The experimental results in this paper show the algorithm is capable of identifying and rendering areas of collision risk in restricted waters.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 1; 101-105
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Risk analysis when navigating in restricted sea areas
    Autorzy:
    Rutkowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/320869.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    analiza ryzyka
    wody ograniczone
    risk analysis
    restricted waters
    Opis:
    This paper discusses the question of classifying the sea areas as sea areas difficult for navigation, unrestricted sea areas and sea areas restricted by land (bottom or shore). Most of all, the article depicts the characteristics of restricted sea areas. It presents the attempt to define in a new way the following notions: "safety of shipping", "safety of navigation", "risk of navigation", "risk of collisions", "navigational obstacle", and "sea area difficult for navigation". In this paper author also presents methods that can be used for estimating safety of navigation (navigational risk) in the restricted sea areas by means of the model of the ship's domain. The essence of the method suggested in the thesis is the systematic approach to sea vessel operation in the aspect of estimating its safety when navigating in restricted sea areas.
    Źródło:
    Annual of Navigation; 2006, 11; 103-122
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of psychological components of human factors on the probability of committing an error during ship handling in restricted waters
    Autorzy:
    Hejmlich, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/24202594.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    human factors
    safety
    psychological profile
    risk
    probability
    restricted waters
    Opis:
    The paper presents a new approach to the evaluation of human factor (HF) influence on the risk of maritime accidents. This approach is based on a formal human–ship–environment system definition including the relationships between humans, technology, environment, and organization. Social and organizational factors have already been included in the International Maritime Organization regulations; however, the individual factors still need investigation. A combination of psychological studies and technical operations of sea-going ships has given a huge opportunity to use HF assessment in rule-making processes. The main scientific goal of the research presented in the paper was the development of a method to assess the influence of HF on the risk of maneuvering accidents in restricted waters. This method is based on research within the area of technical ship operation and the results of the psychological profile of operators. The proposed model is based on a quantitative HF model developed by an authorized psychologist comprising personality traits, vulnerability to stress, and risk approach. The investigations were carried out with a group of 32 experienced ship masters performing a complex maneuvering task on the Full Mission Ship Handling Simulator. The multidimensional dependencies between variables of the psychological profile and the risk of an accident resulting from maneuvering errors were implemented into the Sugeno fuzzy model. The developed model allows risk assessment to be conducted that depends on the selected personality profile features. These features can be measured using psychological questionnaires, and then the risk of an accident due to maneuvering error can be calculated for a captain or marine pilot in order to improve human resource management.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 72 (144); 42--47
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study on the influences of canal geometry on ship squat
    Autorzy:
    Zhou, M.
    Zou, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/360783.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    accurate prediction
    safety passage
    restricted waters
    numerical calculations
    squat
    Opis:
    Accurate prediction of the ship squat is of significance to ensure safety passage of ships in restricted waters. In this paper, a first-order Rankine source panel method is adopted to predict the squat of a ship sailing in restricted canal. Taking KVLCC2 tanker as example, numerical calculations are carried out for the ship travelling in a canal with different conditions. The results of squat are compared with measurement data and the results from empirical formulas. The influence of canal geometry on ship squat is investigated.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 195-199
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Informacje manewrowe statku w planowaniu nawigacji w rejonach ograniczonych
    Ship manoeuvring information for navigation planning in restricted waters
    Autorzy:
    Jurdziński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/344244.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
    Tematy:
    manewrowanie statkiem
    planowanie nawigacji
    rejony ograniczone
    ship manoeuvring
    navigation planning
    restricted waters
    Opis:
    W pracy przedstawiono zakres informacji o manewrowaniu statku morskiego oraz jego stanach eksploatacyjnych w rejonach ograniczonych. Omówiono model ruchu statku oraz różne parametry zakłóceń zewnętrznych działających na statek. Przedstawiono zakres informacji o manewrach statku zalecanych przez Międzynarodową Organizacje Morską. Na zakończenie zaprezentowano złotą regułę manewrowania statkiem.
    This paper relates to manoeuvring information used for passage planning in restricted waters. Different phases of ship movements in terms of external disturbances have been discussed. Required information for passage planning published in the IMO (International Maritime Organization) documents has been presented. Finally, the golden rule of ship manoeuverability as a berthing guidance for ship masters has been given.
    Źródło:
    Prace Wydziału Nawigacyjnego Akademii Morskiej w Gdyni; 2018, 33; 9-20
    1730-1114
    Pojawia się w:
    Prace Wydziału Nawigacyjnego Akademii Morskiej w Gdyni
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reinforcement Learning in Ship Handling
    Autorzy:
    Łącki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/117361.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Ship Handling
    Reinforcement Learning
    Machine Learning Techniques
    Manoeuvring
    Restricted Waters
    Markov Decision Process (MDP)
    Artificial Neural Network (ANN)
    multi-agent environment
    Opis:
    This paper presents the idea of using machine learning techniques to simulate and demonstrate learning behaviour in ship manoeuvring. Simulated model of ship is treated as an agent, which through environmental sensing learns itself to navigate through restricted waters selecting an optimum trajectory. Learning phase of the task is to observe current state and choose one of the available actions. The agent gets positive reward for reaching destination and negative reward for hitting an obstacle. Few reinforcement learning algorithms are considered. Experimental results based on simulation program are presented for different layouts of possible routes within restricted area.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 2; 157-160
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship domain in open sea areas and restricted waters: an analysis of influence of the available maneuvering area
    Autorzy:
    Wielgosz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/117213.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    ship domain
    open sea areas
    restricted waters
    available maneuvering area
    Electronic Chart Display and Information System (ECDIS)
    navigational safety assessment
    safety at sea
    simulation method
    Opis:
    A ship domain is nowadays an important navigational safety assessment criterion. Its shape and size depend on many factors. The available maneuvering area seems to be one of the most important of them. This article examines the influence of the available manoeuvring area on the shape and size of ship domain in the open sea and restricted waters. The research was conducted using a simulation method. Expert navigators participated in simulations using the ECDIS system. The domains of ship passages in open sea area and restricted area have been compared.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 99-104
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship Course Following and Course Keeping in Restricted Waters Based on Model Predictive Control
    Autorzy:
    Liu, H.
    Ma, N.
    Gu, X. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116264.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Ship Movement, Multiple-Input Multiple-Output (MIMO)
    Very Large Crude Carrier (VLCC)
    Model Predictive Control (MPC)
    Linear Quadratic Regulator (LQR)
    course
    restricted waters
    safety at sea
    Opis:
    Ship navigation safety in restricted water areas is of great concern to crew members, because ships sailing in close proximity to banks are significantly affected by the so-called ship-bank interaction. The purpose of this paper is to apply the optimal control theory to help helmsmen adjust ships’ course and maintain the target course in restricted waters. To achieve this objective, the motion of a very large crude carrier (VLCC) close to a bank is modeled with the linear equations of manoeuvring and the influence of bank effect on the ship hydrodynamic force is considered in the model. State-space framework is cast in a Multiple-Input Multiple-Output (MIMO) system, where the offset-free model predictive control (MPC) is designed for course following and the linear quadratic regulator (LQR) is used for course keeping. Simulation results show that the control methods effectively work in ship course following and course keeping with varying ship-bank distances and water depths. The advantage of adopting speed variation as the second control input is obvious.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 305-312
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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