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    Wyświetlanie 1-3 z 3
    Tytuł:
    Microstructural Analysis of Asymmetric Dilution by Rotating Direct Metal Deposition
    Autorzy:
    Choi, Byungjoo
    Lee, Gwang-Jae
    Yeom, Hyun-Ho
    Lee, Moon-Gu
    Jeon, Yongho
    Powiązania:
    https://bibliotekanauki.pl/articles/356931.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rotating direct metal deposition
    asymmetric dilution
    cross-sectional analysis
    microstructure
    metallurgical composition
    Opis:
    In this study, cross-section analysis was performed on a novel rotating direct-metal deposition method capable of preliminary surface treatment and damage repair of cylindrical inner walls. The cross-sectional shape, microstructure, and metallurgical composition were analyzed to verify feasibility. No defects such as porosity or cracks were found in the cross section, but asymmetric dilution was observed because of the non-coaxial powder nozzle. Microstructural coarsening was confirmed over a higher dilution area by high-magnification optical microscope images. As the dilution ratio was increased, hard carbides in the dendrite were bulkdiffused into inter-dendrite spaces, and the toughness was lowered by Fe penetration into the deposit. Therefore, the increased laser heat input can be modulated to the typical dilution by decreasing the laser scanning velocity.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 535-538
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acquisition and tracking performance of satellite navigation system signal using tiered differential polyphase code
    Autorzy:
    Jo, Gwang Hee
    Lee, Ju Hyun
    Noh, Jae Hee
    Lee, Sang Jeong
    Lee, Jin Hyuk
    Powiązania:
    https://bibliotekanauki.pl/articles/320518.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    Zadoff-Chu sequence
    polyphase codes
    acquisition
    tracking
    Opis:
    In this paper, we analyze the acquisition and tracking performance of signal using a tiered differential polyphase code as the secondary code. The Zadoff-Chu sequence is known to have a CAZAC (Constant Amplitude Zero Auto-Correlation) characteristics. The secondary code generated by differential encoding of the Zadoff-Chu sequence also has the same characteristics as the Zadoff-Chu sequence. Therefore, long integration will give better correlation results. We compare signal acquisition and tracking performance when using the NH sequence and Zadoff-Chu sequence as the secondary code. Monte-carlo simulation is performed using MATLAB. We use the probability of detection and the mean acquisition time for signal acquisition performance and tracking jitter for signal tracking performance.
    Źródło:
    Annual of Navigation; 2019, 26; 5-11
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis of GPS/BDS integrated precise positioning system considering visibility of satellites
    Autorzy:
    Noh, Jae Hee
    Jo, Gwang Hee
    Lim, Deok Won
    Lee, Jin Hyuk
    Lee, Sun Yong
    Lee, Sang Jeong
    Powiązania:
    https://bibliotekanauki.pl/articles/320929.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    BDS
    precise positioning
    urban canyon
    Opis:
    Research on precise positioning is being actively carried out to provide accurate position information for land transportation. The most significant problem when performing precise positioning in urban canyon is the degradation of performance due to the lack of visible satellites. Prior to open service of BDS, most of the studies on positioning were focused on using GPS/GLONASS integrated navigation system. Since BDS began open service, studies using GPS/BDS have been actively performed in the Asia-Pacific region as it became possible to acquire enough available BDS satellites. The average number of visible satellites in Korea is 9 for GPS and 14 for BDS. In this paper, we analyze the availability of precise positioning using BDS in urban canyon. To do this, we simulate the urban canyon environment by applying the mask to the azimuth and the elevation. We analyze the positioning accuracy using two simulation scenarios. From the results, it is shown that the accuracy of precise positioning in the case where the satellites in the east-west direction are blocked is lowered than that in the case where the satellites in the south-north direction are blocked for the same elevation mask angle. This result comes from the fact that the PDOP increases when the satellites are blocked in the east-west direction. Also, it can be confirmed that the GPS/BDS integrated positioning is available for the high mask angle while the GPS-only positioning is not possible continuously.
    Źródło:
    Annual of Navigation; 2019, 26; 65-75
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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