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    Wyświetlanie 1-7 z 7
    Tytuł:
    Low-Complexity Non-uniform Constellation Demapping Algorithm for Broadcasting System
    Autorzy:
    Wang, Chen
    Wang, Fang
    Li, Mingqi
    Tian, Jinfeng
    Powiązania:
    https://bibliotekanauki.pl/articles/226497.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    non-uniform constellation
    soft demapping
    complexity
    QAM
    NGB-W
    Opis:
    This paper presents a novel low-complexity soft demapping algorithm for two-dimensional non-uniform spaced constellations (2D-NUCs) and massive order one-dimensional NUCs (1D-NUCs). NUCs have been implemented in a wide range of new broadcasting systems to approach the Shannon limit further, such as DVB-NGH, ATSC 3.0 and NGB-W. However, the soft demapping complexity is extreme due to the substantial distance calculations. In the proposed scheme, the demapping process is classified into four cases based on different quadrants. To deal with the complexity problem, four groups of reduced subsets in terms of the quadrant for each bit are separately calculated and stored in advance. Analysis and simulation prove that the proposed demapper only introduces a small penalty under 0.02dB with respect to Max-Log-MAP demapper, whereas a significant complexity reduction ranging from 68.75% to 88.54% is obtained.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 3; 413-420
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lingua receptiva in Europe: the map and the territory
    Autorzy:
    Steciąg, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/1374237.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    receptive multilingualism
    mutual intelligibility
    lingua receptiva
    language constellation
    European language families
    Opis:
    As a result of complex and closely-related social, political, economic and technological processes, significant changes are now occurring in the European language situation. While these processes foster participation in the transnational communication community, they also reinforce the linguistic identity, based on their distinction. In view of these contradictory but non-exclusive trends, one should consider the multilingual systems that would better reflect the dynamics of real changes. For this purpose, the concept of lingua receptiva will be presented. Geographical and cultural perspectives are taken into account in this paper. Emphasis is on the space of discursive interculturalism, in which contacts in more or less fixed language constellations constantly take place. Its allocation on the political map of the European continent is not performative, but based on the literature. However, it does illustrate the challenges for the future of European receptive multilingualism.
    Źródło:
    Przegląd Wschodnioeuropejski; 2020, XI, 2; 487-497
    2081-1128
    Pojawia się w:
    Przegląd Wschodnioeuropejski
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cultural Sources of Verse: A Poem by Eugen Gomringer
    Kulturowe korzenie poezji. O jednym wierszu Eugena Gomringera
    Autorzy:
    Kremer, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/2012244.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
    Tematy:
    Gomringer
    poezja konkretna
    malarstwo konkretne
    Bill
    konstelacja
    concrete poetry
    concrete painting
    constellation
    Opis:
    Eugen Gomringer’s poetry of the 1950s and ‘60s was strongly rooted in such elements of contemporaneous culture as Swiss concrete painting, the Swiss style of typography, the functional design of the Bauhaus tradition, and the Stuttgart-based modern theories of aesthetics. Some of these practices were the basis on which Gomringer constructed his own poetic means, while others were directly implemented in the layout or cover designs of Gomringer’s poetic books. In this paper the sources of Gomringer’s verse are examined with special reference to the book 33 konstellationen and the mathematical verse construction of one poem, “worte sind schatten,” whose structure proves to be paradoxical, simultaneously complicated yet simple.
    Źródło:
    Prace Filologiczne. Literaturoznawstwo; 2013, 3(6) cz.1; 125-139
    2084-6045
    2658-2503
    Pojawia się w:
    Prace Filologiczne. Literaturoznawstwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of the dual constellation GPS/GALILEO mobile device for improving navigation of the visually impaired in an urban area
    Autorzy:
    Drypczewski, K.
    Moszyński, M.
    Demkowicz, J.
    Bikonis, K.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/258979.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    dual constellation receiver
    GPS
    Galileo
    voice maps
    navigation for the blind
    visually impaired
    personal navigation device
    PND
    Opis:
    The article discusses damages of essential tribological associations in crankshaft and piston systems of large power two-stroke engines used as main engines, which take place during transport tasks performed by those ships. Difficulties are named which make preventing those damages impossible, despite the fact that the technical state of engines of this type is identified with the aid of complex diagnostic systems making use of advanced computer technology. It is demonstrated that one of causes of the damages is the lack of research activities oriented on recognising random properties of the loads leading to those damages. A proposal is made for the loads acting at a given time t on tribological associations in crankshaft and piston systems of internal combustion engines used as main engines to be considered as random variables Qt. At the same time the loads examined within a given time interval tr ≤ t ≤ tz would be considered stochastic processes {Q(t): t ≥ 0}. Essential properties of the loads of the abovementioned tribological associations are named and explained by formulating hypotheses which need empirical verification. Interval estimation is proposed for estimating the expected value E(Qt) of the load Qt acting at time t. A relation is indicated between the mechanical load and the thermal load acting on tribological associations in the ship main engine crankshaft and piston system. A suggestion is formulated that a stochastic form of the relation between these types of load is to be searched for, rather than statistic relation, and a proposal is made to measure the intensity (strength) of the stochastic relation using the Czuprow’s convergence coefficient.
    Źródło:
    Polish Maritime Research; 2015, 4; 15-20
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of advanced optical modulation format and estimation of signal-to-noise-ratio based on parallel-twin convolutional neural network
    Autorzy:
    Dong, Xiaowei
    Yu, Zhihui
    Powiązania:
    https://bibliotekanauki.pl/articles/27310103.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    deep learning
    PT-CNN
    parallel-twin convolutional neural network
    constellation diagram
    modulation format identification
    SNR estimation
    Opis:
    In this paper, we design a parallel-twin convolutional neural network (PT-CNN) deep learning model and use the signal constellation diagram to realize the identification of six advanced optical modulation formats (QPSK, 4QAM, 8PSK, 8QAM, 16PSK, 16QAM) and signal-to-noise-ratio (SNR) estimation. The influence of PT-CNN with different layers and kernel sizes is investigated and the optimal network model is chosen. Simulation results demonstrate that the proposed method has the advantages of not requiring manual feature extraction, having the ability to clearly distinguish the six modulation formats with 100% accuracy when SNR of the received signal sequences is higher than 12 dB. In addition, the high-accurate SNR estimation is realized simultaneously without increasing additional system complexity.
    Źródło:
    Optica Applicata; 2023, 53, 2; 281--289
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    G4 Multi-constellation Precise Point Positioning service for high accuracy offshore navigation
    Autorzy:
    Tegedor, J.
    Ørpen, O.
    Melgård, T.
    Łapucha, D.
    Visser, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/115985.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite Systems (GNSS)
    high accuracy offshore navigation
    Precise Point Positioning (PPP)
    Integer-Ambiguity Resolution (IAR)
    G4 system architecture
    Multi-constellation Precise Point Positioning Service
    offshore navigation
    positioning accuracy
    Opis:
    Fugro is operating a global GNSS infrastructure for the delivery of high-accuracy multi-constellation Precise Point Positioning (PPP) service, named G4. Precise orbit and clock for all global satellite navigation systems are estimated in real-time and broadcast to the users using geostationary satellites. End-users with a G4-enabled receiver are able to obtain sub-decimeter positioning accuracy in real-time. The system has been tailored for offshore applications where a nearby GNSS station is not always readily available. G4 offers seamless integration of GPS, GLONASS, Galileo and BeiDou in the navigation solution, therefore allowing the user to obtain a reliable and accurate position even in challenging environments, especially in presence of interference, scintillation or partial sky visibility. In addition, carrier-phase integer-ambiguity resolution (IAR) is supported, for those users requiring the highest possible navigation accuracy. This paper presents the G4 system architecture and current performance. The benefits of multi-constellation Precise Point Positioning (PPP) are shown in terms of increased availability, robustness and accuracy.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 425-429
    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 Correspondence of Michał Antoni Hacki and Johannes Hevelius
    Autorzy:
    Jasiński, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/31021583.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Instytut Historii im. Tadeusza Manteuffla PAN w Warszawie
    Tematy:
    Michał Antoni Hacki (ca. 1630–1703)
    Johannes Hevelius (1611–1687)
    correspondence in the 17th century
    scholarly contacts
    Republic of Letters
    Scutum constellation
    Michał Antoni Hacki (ok. 1630–1703)
    Jan Heweliusz (1611–1687)
    korespondencja w XVII w.
    kontakty naukowe
    rzeczpospolita uczonych
    gwiazdozbiór Tarczy
    Opis:
    Artykuł przedstawia korespondencję opata oliwskiego Michała Antoniego Hackiego (ok. 1630–1703) z gdańskim astronomem Janem Heweliuszem (1611–1687), prowadzoną nieregularnie w latach 1654–1686. Omawia obecne w niej zagadnienia, które uzupełniają dotychczasowe ustalenia dotyczące biografii obu korespondentów, w tym m.in. zainteresowania Hackiego muzyką czy przekonanie Heweliusza o niesłuszności stosowania pozycyjnych instrumentów astronomicznych zaopatrzonych w lunety. Ponadto przedstawia nieznane dotychczas okoliczności wyznaczenia gwiazdozbioru Tarczy ku czci Jana III i dedykowania mu książki Heweliusza.
    The article presents the correspondence of Michał Antoni Hacki (ca. 1630– 1703), abbot of the Oliwa monastery, and Johannes Hevelius (1611–1687), astronomer from Gdańsk, which was conducted irregularly between 1654 and 1686. The article discusses elements of the correspondence that supplement the present findings about biographies of both correspondents, including e.g. Hacki’s interests in music and Hevelius’s belief that positional astronomical instruments with telescopes should not be used. Moreover, it presents hitherto unknown circumstances of introducing the constellation of Scutum to honor the King John III and of dedicating to him a book by Hevelius.
    Źródło:
    Odrodzenie i Reformacja w Polsce; 2023, 67; 199-230
    0029-8514
    Pojawia się w:
    Odrodzenie i Reformacja w Polsce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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