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    Wyświetlanie 1-7 z 7
    Tytuł:
    A Modified Approach to Punctured Product Polar Codes
    Autorzy:
    Hanif, Mohammad Abu
    Vafi, Sina
    Powiązania:
    https://bibliotekanauki.pl/articles/308633.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    polar code
    product code
    punctured codes
    iterative decoding
    Opis:
    A high-performance polar code introduced as a product polar code can be constructed by concatenating two short length polar codes. The punctured structure of this code was achieved by puncturing one of its constituent codes. The constructed polar code provided better performance than a single polar code in the error floor region. However, its performance in the waterfall region was not as good as that of single polar codes. This paper proposes a new puncturing algorithm for product codes constructed by two identical polar codes. Puncturing is conducted on both constituent codes, to ensure that the new code outperforms the previously punctured product polar and single polar codes. This is evident in both waterfall and error floor regions.
    Źródło:
    Journal of Telecommunications and Information Technology; 2019, 3; 63-69
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel Hybrid Model Investing in 5G Network Optimization Under Suzuki Fading Channel
    Autorzy:
    Abed, Muntadher Suhail
    Powiązania:
    https://bibliotekanauki.pl/articles/27311908.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    5G
    Suzuki Fading Channel
    polar code
    quality of service (QoS)
    rate matching
    Opis:
    Nowadays, the advancement and increased use of fifth-generation (5G) and sixth-generation (6G) systems have created a demand for more efficient and rapid transmission of information over wireless communication media. However, developing wireless communication systems that can meet these modern-day criteria for fast, reliable, and secure information exchange is a challenging task. To address this issue, this paper proposes a novel model for enhancing the 5G system. The proposed model utilizes polar code with rate matching and constitutional interleaving over the Suzuki fading channel. The combination of polar codes with rate matching and interleaving enables the communication system to achieve a lower error rate and better reliability over a Suzuki fading channel. Specifically, the polar code can correct a larger number of errors, while rate matching and interleaving can mitigate the effects of channel variations and reduce the probability of error bursts. These enhancements can lead to more robust and reliable communication in wireless networks.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 3; 553--558
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Operation of seagoing cruise ships in polar waters of the Antarctica
    Autorzy:
    Wolski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/198277.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    safety of navigation
    maritime tourism
    Polar Code
    Antarctica
    bezpieczeństwo nawigacji
    turystyka morska
    Kod Polarny
    Antarktyda
    Opis:
    As maritime tourism has been developing dynamically in recent years, including cruises into polar areas, the author attempts to identify factors essential for the safety of navigation in those sea areas, with a specific focus on the waters of the Antarctica. The presented methods of navigation take account of hazards that are typical in polar waters. All the considerations are based on the guidelines of the Polar Code.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2017, 96; 215-219
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability of vessels in an ice-free Arctic
    Autorzy:
    Johansen, K.
    Sollid, M. P.
    Gudmestad, O. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841599.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Ice-Free Arctic
    Maritime Education and Training
    stability of vessels
    ship stability
    Icing
    marine Icing model
    Polar Low
    IMO Polar Code
    Opis:
    One consequence of the declining ice cover in the Arctic is increased areas of open seas. These new open sea areas lead to some challenging aspects related to ship stability. Longer fetch lengths, associated with build-up of larger waves followed by increased conditions for sea spray icing on vessels is one aspect. Open seas in combination with cold atmospheric temperatures is a prerequisite for polar low pressures to occur. Polar lows may represent an additional aspect of increased icing on vessels by heavy snow in addition to extensive sea spray ice accretion. Over the last decades, different formulas for prediction of sea spray ice accretion rate on ships were developed to form basis for ice accretion warnings. Some of these formulas seem to have certain limitations and appear to be conservative. Important limitations of some formulas are considerations regarding heat flux, relationship between wind and waves, and ice accretion related to Polar lows. This paper will take a closer look at the accuracy and the realism of different ice accretion formulas and, related to this aspect, we will also discuss whether ship officer candidates receive sufficient maritime education and training (MET) related to realistic ice accretion and ship icing aspects.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 3; 663-671
    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 simulator training to mitigate risks in Arctic shipping operations
    Autorzy:
    Røds, J. F.
    Gudmestad, O. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/949947.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    maritime education and training (MET)
    simulator training
    maritime simulator training
    Arctic Shipping Operations
    polar code
    polar region
    risk reducing
    risk reducing measure
    Opis:
    Over the recent years, ship traffic in the polar areas has increased. There is reason to believe that this traffic, and especially the cruise traffic, will increase further as the ice retracts towards the poles. There is also reason to believe that with the continued focus and exposure of the Polar Region, the cruise tourism to the region will grow. The increased presence in the polar areas will create positive repercussions for several actors, both on sea and land. There will, however, also be challenges associated with the growing presence in the polar areas. Vessels will be operating at long distances to other vessels and land infrastructures. These vessels will also be operating in climate and conditions that will put extra pressure on both vessel and crew. These challenges need to be solved in order for the ship industry to operate safely in the Polar Region. To ensure that companies operating in these areas identify and manage these challenges, the International Maritime Organization (IMO) developed the Polar Code (2017) with the intent of increasing the safety for vessels operating in polar waters, and to reduce the impact on humans and environment in this remote, vulnerable and harsh area. This code defines a number of requirements, with which the vessels should operate in accordance with. In this paper, we reveal which challenges the vessel and its crew need to deal with when navigating in polar waters. The challenges will be analysed and assessed through the use of a preliminary qualitative risk analysis to determine the potential hazards the vessel is exposed to under operations in polar waters, and to find out what level of risk the different hazards represents for the vessel and its crew. The main objective of the paper is to find out how the risk levels can be reduced, with particular focus on the use of simulator training as a risk reducing measure. The final goal is to measure the risk towards acceptance criteria, which have been determined prior to conducting the analysis.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 2; 375-379
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Polar Codes implications for safe ship operations in the Arctic region
    Autorzy:
    Engtrø, E.
    Gudmestad, O. T.
    Njå, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841604.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Arctic Shipping
    IMO Polar Code
    Arctic region
    safe ship operations
    risk management
    Arctic ship operations
    regulatory Governance
    emergency response
    Opis:
    Simultaneously with a decreasing sea ice cover in the Arctic region an increase in ship traffic is experienced in these waters, meaning a higher probability of accidents and incidents to occur. The capability to handle emergency situations for shipowners, operators and rescuers in a cold climate environment are heavily affected by the risks present in polar waters and depends on limited emergency response resources covering extremely large areas. In 2017, the International Code for Ships Operating in Polar Waters (The Polar Code) was adopted by the International Maritime Organization (IMO), applicable for the Arctic and Antarctic regions. The goals of the functionally based regulation are to provide for safe ship operations and the protection of the polar environment, by addressing risks present in polar waters and to ensure these are mitigated sufficiently. A qualitative pilot study, with individual expert interviews, has been conducted in order to examine the Polar Code's implications for safe ship operations in the Arctic region. The study concludes that the discussions raised in the aftermath of the Polar Code has led to an increase in focus and a strengthen consciousness about hazards and risks associated with polar water ship operations and additional measures required to mitigate these. Further, the implementation of the Polar Code is considered as a milestone by establishing an international regulation, mandatory for polar water ship design and for voyage planning. However, the study points out that the main principle of the Polar Code is risk-based, meaning the performance of safe ship operations are depending on those subjects to the regulation, to conduct thorough operational risk assessments covering all actual hazards, and to ensure that those are mitigated sufficiently. In this regard, authority presence is found crucial, to validate the adequacy and the dimensioning of the implemented measures. Key words: Arctic ship operations; regulatory governance; emergency response; risk management.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 3; 655-661
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Polar Code in force
    Kodeks Polarny po wejściu w życie
    Autorzy:
    Głuchowska-Wójcicka, Maja
    Powiązania:
    https://bibliotekanauki.pl/articles/1954467.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Polar Code
    IMO
    Northwest Passage
    Northern Sea Route
    Arctic Shipping
    Arctic council
    Law of the Sea
    Canada
    Russia
    Kodeks Polarny
    Północna Droga Morska
    Przejście Północno-Zachodnie
    Żegluga w Arktyce
    Rada Arktyczna
    Prawo Morza
    Kanada
    Rosja
    Nauki Humanistyczne i Społeczne
    Opis:
    There is a growing interest in new transportation routes that combine benefits of shorter distances, cost-effective transits and routes not troubled by maritime security concerns. The Northwest Passage offers a package of routes through the Canadian maritime zone; it is 9,000 km shorter than the Panama Canal route and 17,000 km shorter than the Cape Horn route. The Northern Sea Route shortens a Hamburg-Yokohama voyage by 4,800 miles, in comparison with the Suez Canal route. The transpolar route, if it materializes with an ice-free Central Arctic Ocean route, would shorten distances even further. Given the increase in regional and international navigation and shipping in the region, it is therefore not surprising that in recent years Arctic States and international bodies focused on the needs of enhanced safety and environmental standards for polar shipping. In addition to the dedicated domestic polar shipping regulation, primarily in Canada and the Russian Federation, the Arctic Council and International Maritime Organization (IMO) have launched important initiatives. The most important is establishing of international rules for ships operating in polar waters- The Polar Code.
    Jednym ze skutków zmian klimatycznych i topnienia lodów arktycznych jest otwarcie nowych szlaków żeglugowych, które skracają drogę z Dalekiego Wschodu do państw basenu północnego Atlantyku nawet o 40%. Transport morski wodami arktycznymi mimo wciąż trudnych warunków nawigacji i komunikacji rozwija się dynamicznie. Brak wystarczających regulacji prawnych dla regionu i duże zagrożenie dla środowiska naturalnego stały się przyczyną do prac nad normami regulującymi żeglugę na obszarach polarnych. Z dniem 1 stycznia 2017 roku w życie wszedł opracowany przez Międzynarodową Organizację Morską Międzynarodowy Kodeks dla Statków Uprawiających Żeglugę na Wodach Polarnych, zwany Kodeksem Polarnym. Celem Kodeksu Polarnego jest zapewnienie bezpieczeństwa i ochrona środowiska morskiego.
    Źródło:
    Prawo Morskie; 2017, XXXIII; 25-36
    0860-7338
    Pojawia się w:
    Prawo Morskie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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