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    Wyświetlanie 1-7 z 7
    Tytuł:
    Model of line-of-sight ultraviolet propagation
    Autorzy:
    Li, B.
    Wang, Hongbo
    Mao, Z.
    Dong, Z.
    Zhang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/174219.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ultraviolet communication
    bipyramid model
    scattering characteristic
    line-of-sight (LOS) communication mode
    Opis:
    The traditional line-of-sight ultraviolet model cannot serve better for link performance study for the reason that the scattering characteristic is often ignored in the modelling process. Therefore, a line-of-sight ultraviolet bipyramid model in combination with transceiver full beam angles and geometrical relationship of the transceiver field of view intersection is established. The theoretical rationality of the bipyramid model in comparison with a traditional line-of-sight model is demonstrated by the classically analytical model for line-of-sight scenario. Based on a bit error rate requirement of voice communication, the effects of transmitting power versus range for three line-of-sight ultraviolet communication modes are further analyzed.
    Źródło:
    Optica Applicata; 2014, 44, 4; 601-610
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topic- and Mode-Sensitive Interaction Strategies: Functions of Ellipsis in Oral Communication
    Autorzy:
    White, Jonathan
    Powiązania:
    https://bibliotekanauki.pl/articles/620837.pdf
    Data publikacji:
    2015-09-01
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    ellipsis
    interaction
    oral discourse
    textchat
    discourse topic
    mode of communication
    Opis:
    In this article, we discuss ellipsis as an interactive strategy by analysing the author’s textchat corpus and the VOICE corpus of English as a Lingua Franca. It is found that there were fewer repetitions in the textchat data, and this is explained as a consequence of the textchat mode. Textchat contributions are preserved as long as the chat is active or has been saved, and therefore users can scroll through and review the discussion, compared to the more fleeting nature of oral conversation. As a result, repetition is less necessary. The frequency of other functions identified could be attributed to the topic of discourse. Discussions involve much ellipsis used to develop discourse, although some were self-presentations with repetition used to confirm details. Back-channel support and comments were often low because speakers instead used forms like yeah as supportive utterances.
    Źródło:
    Research in Language; 2015, 13, 3; 334-350
    1731-7533
    Pojawia się w:
    Research in Language
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Social influence and impact of social media on users’ mobility decisions
    Autorzy:
    Karatsoli, Maria
    Nathanail, Eftihia
    Powiązania:
    https://bibliotekanauki.pl/articles/2141123.pdf
    Data publikacji:
    2021
    Wydawca:
    Fundacja Centrum Badań Socjologicznych
    Tematy:
    activity planning
    mode choice
    questionnaire survey
    travel behavior
    sustainable mobility
    Information Communication Technology
    ordinal regression
    Opis:
    Social media are deemed influential in making decisions and seeking advice. Due to their explosive growth as critical channels for information, their content can trigger a place visit, a change of transport mode or destination, or plans’ cancellation. The main objective of this paper is to investigate the influence of social media on users’ activity and mobility planning. Responses of 738 participants in a digital survey were used to formulate ordinal regression models. The developed models determine the contribution of users’ demographic characteristics, travel characteristics and social media usage to mobility decisions after using social media as a source of information. These decisions were expressed in two dependent variables; (i) the impact of social media use in activity and mobility planning; (ii) the impact of the proposed transport mode by social media information, on mode choice. Analysis of the results indicated that the models, which considered all the characteristics together, could better predict the two variables.
    Źródło:
    Journal of Sustainable Development of Transport and Logistics; 2021, 6, 1; 32-48
    2520-2979
    Pojawia się w:
    Journal of Sustainable Development of Transport and Logistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Standardization of interface for VHF, MF/HF communication using DSC within Itsintegration with INS in the framework of e-Navigation concept
    Autorzy:
    Koshevyy, V.
    Shishkin, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/117067.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    maritime communication
    Digital Selective Calling (DSC)
    DSC VHF
    Automatic Identification System (AIS)
    S-Mode
    e-Navigation
    AIS Messages
    Integrated Navigation System (INS)
    Opis:
    Digital selective calling (DSC) has a certain drawbacks, which have led to the fact that it is practically not used in address radio communications. Attempts to improve it only within the DSC system itself did not lead to any noticeable results due to neglecting of real user needs. The article proposes an approach to improve the user interface of DSC based on the integration of VHF MF/HF DSC equipment with the INS within the three main outputs of strategic direction of e-navigation development related to the integration of communication and navigation systems and, in particular, the S-mode. This approach allows us to significantly simplify the DSC user interface, based on the standardization of DSC integration for all three VHF MF/HF communication sub bands. For implementation such standardization an additional inclusion into the integration a satellite AIS system should be done. The feasibility of the proposal is supported by the existence of relevant IEC standards and IMO documents. The possibility of increasing the cyber security level of AIS messages in this interface is also considered.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 3; 593-596
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of rational parameters for urban bus route with combined operating mode
    Autorzy:
    Taran, I.
    Litvin, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/375343.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    combined transportation mode
    inter-stop communication matrix
    traffic interval
    capacity coefficient
    unproductive transportation
    rodzaj transportu kombinowanego
    matryca komunikacji pomiędzy przystankami
    interwał ruchu
    współczynnik przepustowości
    transport nieproduktywny
    Opis:
    The paper considers the problems concerning the improvement of passenger transportation process at the expense of the combined operating mode implementation. Efficiency criteria to implement the mixed conveyance forms have been formulated. An extensive approach to determine stopping points, involved in a highspeed route, has been proposed. An economic and mathematical model has been developed. The model makes it possible to study and determine both expediency and rational parameters concerning the implementation of the mixed high-speed conveyance forms. A structure of the integrated efficiency index has been proposed helping select the best approach, and involving the basic economic, technological, and social indices. The modeling outcomes as well as performance efficiency, resulting from the implementation of a high-speed conveyance in the context of an urban route, have been represented.
    Źródło:
    Transport Problems; 2018, 13, 4; 157-171
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of spread spectrum transmission in the aspect of radio communications security
    Zastosowanie transmisji z widmem rozproszonym w aspekcie bezpieczeństwa łączności radiowej
    Autorzy:
    Król, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/30145370.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
    Tematy:
    communication security
    operating mode
    radio communications
    Polish Armed Forces
    frequency hopping
    FH
    SINCGARS
    HAVE QUICK
    narrow band hopping
    broadband hopping
    bezpieczeństwo łączności
    tryb pracy
    łączność radiowa
    Polskie Siły Zbrojne
    hopping wąskopasmowy
    hopping szerokopasmowy
    Opis:
    This publication considers the use of spread spectrum transmissions in the aspect of threats to radio communications security. Numerous restrictions related to the previous use of specific operating modes of VHF, UHF and KF radio stations with reference to the possibilities of counteracting on the part of a potential enemy using the most modern EW (electronic warfare) systems, as well as those based on the procedures of the Russian Federation Armed Forces.
    W niniejszej publikacji poddano pod rozwagę wykorzystanie transmisji z widmem rozproszonym w aspekcie zagrożeń bezpieczeństwa łączności radiowej. Wskazano na liczne ograniczenia związane z dotychczasowym wykorzystywaniem określonych trybów pracy radiostacji VHF, UHF oraz KF w odniesieniu do możliwości przeciwdziałania ze strony potencjalnego przeciwnika wykorzystującego najnowocześniejsze systemy WRE, a także bazujące na procedurach SZ Federacji Rosyjskiej.
    Źródło:
    Scientific Journal of the Military University of Land Forces; 2020, 52, 1(195); 121-134
    2544-7122
    2545-0719
    Pojawia się w:
    Scientific Journal of the Military University of Land Forces
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on communication emitter identification based on semi-supervised dimensionality reduction in complex electromagnetic environment
    Autorzy:
    Ge, Wei
    Qi, Lin
    Tong, Lin
    Zhu, Jun
    Zhang, Jing
    Zhao, Dongyang
    Li, Ke
    Powiązania:
    https://bibliotekanauki.pl/articles/27311449.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    communication emitter identification
    feature extraction
    dimensionality reduction
    VMD
    ESDA
    variational mode decomposition
    exponential semi-supervised discriminant analysis
    identyfikacja emitera komunikacyjnego
    ekstrakcja cech
    redukcja wymiarowości
    rozkład w trybie wariacyjnym
    analiza dyskryminacyjna wykładnicza półnadzorowana
    Opis:
    The individual identification of communication emitters is a process of identifying different emitters based on the radio frequency fingerprint features extracted from the received signals. Due to the inherent non-linearity of the emitter power amplifier, the fingerprints provide distinguishing features for emitter identification. In this study, approximate entropy is introduced into variational mode decomposition, whose features performed in each mode which is decomposed from the reconstructed signal are extracted while the local minimum removal method is used to filter out the noise mode to improve SNR. We proposed a semi-supervised dimensionality reduction method named exponential semi-supervised discriminant analysis in order to reduce the high-dimensional feature vectors of the signals, and LightGBM is applied to build a classifier for communication emitter identification. The experimental results show that the method performs better than the state-of-the-art individual communication emitter identification technology for the steady signal data set of radio stations with the same plant, batch and model.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 4; art. no. e145766
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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