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    Wyświetlanie 1-4 z 4
    Tytuł:
    Passage Planning System in Ports: An overview
    Autorzy:
    Yip, T. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/116807.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Sea Ports
    Passage Planning
    Passage Planning System in Ports
    Maritime Traffic
    Traffic Control
    Vessel Traffic Control
    vessel traffic service (VTS)
    Passage Planning System (PPS)
    Opis:
    A conceptual model is proposed to monitor marine traffic through precautionary areas, which can provide us with a systematic control of passage planning in ports. On one hand, vessel traffic control has its special features and is fundamentally different from highway, air and pedestrian traffic control. The existing traffic control systems cannot be simply extended to vessel traffic control without addressing marine traffic features. On the other hand, existing vessel traffic control focuses on one ship or two ships but does not address the flows of marine traffic.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 4; 483-487
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Predicting the shipping market by spreads of timecharter rates
    Autorzy:
    Yip, T. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/134964.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    timecharter rates
    shipping market
    Panamax dry bulk ships
    economic indicator
    maritime transport
    Opis:
    This paper has explored the predictability of spreads between long-term and short-term timecharter rates on spot freight rates. The spread between long-term and short-term rates (or the slope of the yield curve) is often used as a leading economic indicator of economic activities. This concept has been extended to the shipping market in this paper and the probability that the spot freight rate will increase or decrease has been determined. Using the spread between the timecharter rates on long-term and short-term charter contracts, the direction of spot freight rates has been predicted with the dynamic probit model, which is used to estimate the probability of discrete events. Evidence has been drawn from Panamax dry bulk ships for future weekly, quarterly and biyearly changes of spot freight rates. While the dynamic probit model has shown moderate predictive power, the weekly model has shown that the market has a relatively longer memory than the quarterly and biyearly models.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 53 (125); 9-16
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Marine Traffic Flow Model
    Autorzy:
    Yip, T.L.
    Powiązania:
    https://bibliotekanauki.pl/articles/116041.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    marine traffic
    traffic flow of ships
    collision avoidance system
    Opis:
    A model is developed for studying marine traffic flow through classical traffic flow theories, which can provide us with a better understanding of the phenomenon of traffic flow of ships. On one hand, marine traffic has its special features and is fundamentally different from highway, air and pedestrian traffic. The existing traffic models cannot be simply extended to marine traffic without addressing marine traffic features. On the other hand, existing literature on marine traffic focuses on one ship or two ships but does not address the issues in marine traffic flow.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 1; 109-113
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of fuzzy fault tree analysis and noisy-OR gate bayesian network for navigational risk assessment in Qingzhou Port
    Autorzy:
    Zhao, C.
    Wu, B.
    Yip, T. L.
    Lv, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2063967.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    risk assessment
    Bayesian Network Model
    navigational risk
    navigational risk assessment
    Port of Qingzhou
    fuzzy fault tree
    noisy-OR gate
    navigational accidents
    Opis:
    Collisions and groundings account for more than 80% among all types of maritime accidents, and risk assessment is an essential step in the formal safety assessment. This paper proposes a method based on fuzzy fault tree analysis and Noisy-OR gate Bayesian network for navigational risk assessment. First, a fault tree model was established with historical data, and the probability of basic events is calculated using fuzzy sets. Then, the Noisy-OR gate is utilized to determine the conditional probability of related nodes and obtain the probability distribution of the consequences in the Bayesian network. Finally, this proposed method is applied to Qinzhou Port. From sensitivity analysis, several predominant influencing factors are identified, including navigational area, ship type and time of the day. The results indicate that the consequence is sensitive to the position where the accidents occurred. Consequently, this paper provides a practical and reasonable method for risk assessment for navigational accidents.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 3; 765--771
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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