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    Wyświetlanie 1-7 z 7
    Tytuł:
    Stability Tests of Positive Fractional Continuous-time Linear Systems with Delays
    Autorzy:
    Kaczorek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/117415.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Consequences of Delays
    stability tests
    Positive Fractional System
    Opis:
    Necessary and sufficient conditions for the asymptotic stability of positive fractional continuoustime linear systems with many delays are established. It is shown that: 1) the asymptotic stability of the positive fractional system is independent of their delays, 2) the checking of the asymptotic stability of the positive fractional systems with delays can be reduced to checking of the asymptotic stability of positive standard linear systems without delays.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 2; 211-215
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Ionospheric Delay for SBAS Using Spherical Harmonics Functions
    Autorzy:
    Han, D.
    Yun, H.
    Kee, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116620.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Consequences of Delays
    Ionospheric Delay
    satellite based augmentation system (SBAS)
    Opis:
    In SBAS (satellite‐based augmentation system), it is important to estimate ionospheric delay accurately to guarantee userʹs accuracy and integrity. Grid based ionospheric models are generally used to estimate ionospheric delay for SBAS. In grid based model, SBAS broadcasts vertical ionospheric delays at the grid point, and users get their ionospheric delay by interpolating those values. Ionospheric model based on spherical harmonics function is another method to estimate ionospheric delay. This is a function based approach and spherical harmonics function is a 2‐D fourier series, containing the product of latitude dependent associated Legendre functions and the sum of the longitude dependent sine and cosine terms. Using ionospheric delay measurements, coefficients for each spherical harmonics functions are estimated. If these coefficients are known, user can reconstruct ionospheric delay. In this paper, we consider the spherical harmonics based model and propose a ionospheric delay estimation strategy for SBAS that can be used to mitigate ionospheric delay estimation error, especially in storm condition. First, coefficients are estimated under initial order and degree. Then residual errors for each measurement are modeled by higher order and degree terms, then coefficients for these terms are estimated. Because SBAS message capacity is limited, in normal condition, initial order terms are only used to estimate ionospheric delay. If ionospheric storm is detected and there is need to mitigate the error, higher order terms are also used and error can be decreased. To compare the accuracy of spherical harmonics based model with grid based model, some post‐processing test results are presented. Raw observation data is obtained from RINEX format and the root mean square(RMS) and max value of residual errors are presented.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 2; 205-209
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of watertight subdivision on subdivision Index for medium size ro–ro passenger ferries
    Autorzy:
    Pawłowski, M.
    Laskowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/117274.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    vessel's damage consequences
    Ro-Ro passenger ferries
    SOLAS Convention
    subdivision index
    watertight subdivision
    medium size Ro-Ro
    car deck
    passenger ferries
    Opis:
    Ro-pax vessels should fulfil the requirements of the current harmonised SOLAS Convention. The study analyses the effect of various ro-pax vessel subdivision arrangements on the subdivision index. A Polish ferry was chosen as a generic ship to perform the study. For illustration of damage survivability, the attained subdivision index A was calculated for a number of modified configurations. The arrangements included single and double sides above and below the car deck, with and without a double buoyant car deck. The conclusions of the study can be used in the design of new ro-pax vessels.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 447-450
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Criteria of accidental damage by ships anchors of subsea gas pipeline in the Gdańsk bay area
    Autorzy:
    Marcjan, K.
    Dzikowski, R.
    Bilewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/117554.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    vessel's damage consequences
    criteria of accidental damage
    ships anchors
    subsea gas pipeline
    Gdansk Bay Area
    pipeline
    underwater infrastructure
    damage to the pipeline
    Opis:
    This paper discusses issues of the accidental anchor damage to offshore subsea pipeline as one of the most significant threat to underwater infrastructure. The density of vessel traffic over the pipeline between platform Baltic Beta and Wladyslawowo power plant has been analyzed. In order to determine the most common damages associated with heavy ship traffic, the authors used the risk model for underwater infrastructure. For this purpose ships anchor equipment has been categorized and as the results the criteria of damage to the pipeline have been discussed.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 441-446
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    COVID-19 pandemic impact on a global liner shipping company employee work digitalization
    Autorzy:
    Przybyłowski, A.
    Suchanek, M.
    Miszewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201413.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    seafarers health problems
    COVID-19 pandemic
    global liner shipping company
    humanlife and health
    shipowner company
    consequences of COVID-19 pandemic
    working model
    seafarers
    Opis:
    The SARS-CoV-2 pandemic that began to spread across the world in 2020 still poses a threat not only to human life and health, but also to the global economy. This situation led to the breakdown of many supply chains, and this could have resulted in the collapse of the international exchange of goods. The COVID-19 affected the shipping industries development: shipping operators, port operators, government authorities, shippers, seafarers, passengers, supply chain operators and others. The paper presents the impact of the pandemic on the working model throughout the results of a survey conducted among the office employees of a shipowner company being one of the leaders in the maritime container transport sector. It aimed to investigate the effects of the pandemic as regards the management and organisation processes in the light of digital transformation within this enterprise. Employees were asked to express their opinion on the advantages and disadvantages of the remote work and its influence on the way they performed their duties. At the beginning, employees were most affected by the lack of direct contact with colleagues. At the same time, many of them declared that after the end of the pandemic, they would like to combine the remote and office work . The hypothesis of this research reads as follows: as a reaction to the COVID-19 pandemic, a new working model has been created allowing the continuity and the efficiency of operations in the maritime container sector, therefore ensuring the resilience within the global supply chains. The results prove that the transition of office workers to remote digitalised working mode allowed the company to continue operating efficiently during the first phase of the pandemic. Actually, this new mode, which was initially meant to be only a temporary solution, has become the dominant form or a combination with the traditional mode of work, creating a kind of hybrid version working model in the company.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 4; 759--765
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consequences of maritime critical infrastructure accidents with chemical releases
    Autorzy:
    Bogalecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/117563.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    critical infrastructure
    maritime critical infrastructure
    critical infrastructure accident
    critical infrastructure accident losses
    critical infrastructure accident consequences
    maritime transport critical Infrastructure
    semi-markov process
    chemical releases
    Opis:
    The probabilistic general model of critical infrastructure accident consequences including three models of the process of the initiating events generated by a critical infrastructure accident, the process of the environment threats and the process of environment degradation is created and adopted to the maritime transport critical infrastructure understood as a ship network operating at the sea waters and then applied to accident consequences modeling, identification and to these consequences optimization and mitigation.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 4; 771-779
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long term validation of high precision RTK positioning onboard a ferry vessel using the MGBAS in the Research Port of Rostock
    Autorzy:
    Ziebold, R.
    Gewies, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/116814.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    vessel's damage consequences
    long term validation
    high precision RTK positioning
    Real Time Kinematic (RTK)
    Maritime Ground Based Augmentation Service (MGBAS)
    Port of Rostock
    Global Positioning System (GPS)
    Ultra High Frequency (UHF)
    Opis:
    In order to enable port operations, which require an accuracy of about 10cm, the German Aerospace Center (DLR) operates the Maritime Ground Based Augmentation Service (MGBAS) in the Research Port of Rostock. The MGBAS reference station provides GPS dual frequency code + phase correction data, which are continuously transmitted via an ultra-high frequency (UHF) modem. Up to now the validation of the MGBAS was rather limited. Either a second shore based station was used as an artificial user, or measurement campaigns on a vessel with duration of a few hours have been conducted. In order to overcome this, we have installed three separate dual frequency antennas and receivers and a UHF modem on the Stena Line ferry vessel Mecklenburg-Vorpommern which is plying between Rostock and Trelleborg. This paper concentrates on the analysis of the highly accurate phase based positioning with a Real Time Kinematic (RTK) algorithm, using correction data received by the UHF modem onboard the vessel. We analyzed the availability and accuracy of RTK fix solutions for several days, whenever the ferry vessel was inside the service area of the MGBAS.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 433-440
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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