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Wyszukujesz frazę "service model" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Consideration of a general model of stochastic service curve for communication networks
    Autorzy:
    Wasielewska, K.
    Borys, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/117055.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    communication networks
    stochastic service
    communication system
    maritime telecommunications area
    Quality of Service (QoS)
    stochastic network calculus
    modelling of model of stochastic service curve
    stochastic service curve
    Opis:
    In this paper, a general framework for modelling stochastic service curves for communication networks is presented. It connects with each other two approaches to the traffic analysis and performance evaluation of communication systems, namely, the one which is called a deterministic network calculus with its stochastic counterpart. Thereby, it enables to treat any communication traffic in a consistent way. Further, as we show here, it enables also achieving new results. Derivation of the above model is presented in details in this paper. Finally, some hints are given how the method presented in this article could be applied in maritime telecommunications area.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 159-164
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probabilistic Model of Underkeel Clearance in Decision Making Process of Port Captain
    Autorzy:
    Gucma, L.
    Schoeneich, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/117097.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Probabilistic Model
    Under Keel Clearance (UKC)
    Decision Making Process
    Port Captain
    vessel traffic service (VTS)
    Marine Traffic Engineering (MTE)
    safety at sea
    Monte Carlo Model
    Opis:
    The paper presents practical implementation process of developed probabilistic model of ships underkeel clearance. The model was implemented in “on-line” version and could be used for decision making process of harbour captain in everyday practice. The paper presents the results of validation of the model and the practical guidelines of use in decision making process.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 2; 167-171
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel Through Capacity Model for One-way Channel Based on Characteristics of the Vessel Traffic Flow
    Autorzy:
    Nie, Y.
    Liu, K.
    Xin, X.
    Yu, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/115997.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    maritime traffic
    vessel traffic service (VTS)
    vessel traffic flow
    one-way channel
    mathematical model
    Automatic Identification System (AIS)
    Opis:
    Vessel traffic flow is a key parameter for channel-through capacity and is of great significance to vessel traffic management, channel and port design and navigational risk evaluation. Based on the study of parameters of characteristics of vessel traffic flow related to channel-through capacity, this paper puts forward a brand-new mathematical model for one-way channel-through capacity in which parameters of channel length, vessel arrival rate and velocity difference in different vessels are involved and a theoretical calculating mechanism for the channel-through capacity is provided. In order to verify availability and reliability of the model, extensive simulation studies have been carried out and based on the historical AIS data, an analytical case study on the Xiazhimen Channel validating the proposed model is presented. Both simulation studies and the case study show that the proposed model is valid and all relative parameters can be readjusted and optimized to further improve the channel-through capacity. Thus, all studies demonstrate that the model is valuable for channel design and vessel management.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 495-502
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Error Detection in the Navigational Watch Based on the Behavior Analysis of Navigators
    Autorzy:
    Nishizaki, C.
    Takemoto, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/116923.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Navigators’ Situation Awareness Model
    Human Factor
    Situation Awareness
    safety at sea
    Sea Service
    Navigational Watch
    Error Detection
    watchkeeping
    Opis:
    Poor lookouts, i.e. one of errors in situation awareness, are pointed out as the major cause of collisions of ships, through investigations of collision accidents. In order to evaluate safety measures for preventing collisions caused by poor lookouts, it is necessary to understand background factors, so called “contexts”, of errors in situation awareness regardless of occurrence of collisions. The purpose of this study is to point out the possible significant contexts, using a navigator’s situation awareness model. As a result, we point out that one of the possible significant contexts is a problem on judgment of priority levels of other ships with regard to attention.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 2; 163-168
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary inter-comparison of AIS Data and optimal ship tracks
    Autorzy:
    Mannarini, G.
    Carelli, L.
    Zissis, D.
    Spiliopoulos, G.
    Chatzikokolakis, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/116108.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    AIS Data
    ship track
    Copernicus Marine Environment Monitoring Service (CMEMS)
    Automatic Identification System (AIS)
    VISIR (discoVerIng Safe and effIcient Routes)
    VISIR track
    VISIR model
    optimal ship track
    Opis:
    Optimal ship tracks computed via the VISIR model are compared to tracks recorded by the Automatic Identification System (AIS). The evaluation regards 43 tracks in the Southern Atlantic Ocean, sailed during 2016-2017 by different bulk carriers. In this exercise, VISIR is fed by wave analysis fields from the Copernicus Marine Environment Monitoring Service (CMEMS). In order to reproduce vessel speed loss in waves, a new methodology is developed, where kinematic information from AIS is fusioned with wave information from CMEMS. Resulting VISIR tracks are analyzed along with AIS tracks in terms of their topological features and duration. The tracks exhibit quite diverse topological shapes, including orthodromic, loxodromic, and other paths with complex and dynamic diversions. The distribution of AIS to VISIR track durations is analyzed in terms of several parameters, such as the AIS to VISIR track length and their Fréchet distance. Model features of VISIR affecting the results are discussed and future developments suggested by the results are outlined.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 53-61
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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