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    Wyświetlanie 1-4 z 4
    Tytuł:
    Methods for automatic identification of coke ovens for auto positioning systems in coke plant of steel industries
    Autorzy:
    Patra, P.
    Kundu, C.
    Ghosh, A.
    Tudu, B.
    Bandyopadhyay, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/328517.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    LASER
    image processing
    RADAR
    RFID
    coke ovens
    stal
    przetwarzanie obrazów
    piec koksowniczy
    sterowanie
    kontrola
    Opis:
    Blast furnace operation requires highest quality raw materials, operation and operators. Among them coke is the most important, in terms of its effect on operation and hot metal quality. A good grade coke produces highest thermal energy and it is highly efficient in case of metal reduction. Usage of good grade coke to blast furnace will ensure lower coke rate, higher productivity and lower hot metal cost. In order to concentrate the carbon in coke the coke making process involves carbonation of coal to high temperature (1100°C) in oxygen free atmosphere. There is need to automate the coke oven operations as much as possible. In order to improve the level of control and management of coke oven, the research on intelligent control system is carried out. In modern advanced control system of coke oven, the control scheme of combination, feedback & feed-forward merged with management are widely utilized. The integrated management and control system of coke oven is introduced systematically, including the production plan and scheduling management (Dynamic scheduling) & heating control system (Mathematical modeling) i.e. evaluating battery temperature, intelligent combustion control and pressure control of gas collector of coke oven battery.
    Źródło:
    Diagnostyka; 2018, 19, 2; 95-103
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved Signal Detection Techniques for QOSTBC System in Fast Fading Channel
    Autorzy:
    Patra, Jyoti P.
    Singh, Poonam
    Powiązania:
    https://bibliotekanauki.pl/articles/307747.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    ITAI
    QOSTBC
    signal detection
    time selective channel
    Opis:
    Most existing quasi-orthogonal space time block coding (QO-STBC) schemes have been developed relying on the assumption that the channel is flat or remains static during the length of the code word symbol periods to achieve an optimal antenna diversity gain. However, in timeselective fading channels, this assumption does not hold and causes intertransmit-antenna-interferences (ITAI). Therefore, the simple pairwise maximum likelihood decoding scheme is not sufficient to recover original transmitted signals at the receiver side. To avoid the interferences, we have analyzed several signal detection schemes, namely zero forcing (ZF), two-step zero forcing (TS-ZF), minimum mean square error (MMSE), zero forcing – interference cancelation – decision feedback equalizer (ZF-IC-DFE) and minimum mean square error – interference cancelation – decision feedback equalizer (MMSE-IC-DFE). We have proposed two efficient iterative signal detection schemes, namely zero forcing – iterative interference cancelation – zero forcing – decision feedback equalization (ZF-IIC-ZF-DFE) and minimum mean square error – parallel interference cancelation – zero forcing – decision feedback equalization (MMSE-IIC-ZF-DFE). The simulation results show that these two proposed detection schemes significantly outperform all conventional methods for QOSTBC system over time selective channel.
    Źródło:
    Journal of Telecommunications and Information Technology; 2020, 1; 6-12
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A DFT-based Low Complexity LMMSE Channel Estimation Technique for OFDM Systems
    Autorzy:
    Patra, Jyoti P.
    Pradhan, Bibhuti Bhusan
    Singh, Poonam
    Powiązania:
    https://bibliotekanauki.pl/articles/2058504.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    channel estimation
    LMMSE
    mean square error
    OFDM
    Opis:
    The linear minimum mean square error (LMMSE) channel estimation technique is often employed in orthogonal frequency division multiplexing (OFDM) systems because of its optimal performance in the mean square error (MSE) performance. However, the LMMSE method requires cubic complexity of order O(N 3 p ), where Np is the number of pilot subcarriers. To reduce the computational complexity, a discrete Fourier transform (DFT) based LMMSE method is proposed in this paper for OFDM systems in the frequency selective channel. To validate the proposed method, the closed form mean square error (MSE) expression is also derived. Finally, a computer simulation is carried out to compare the performance of the proposed LMMSE method with the classical LS and LMMSE methods in terms of bit error rate (BER) and computational complexity. Results of the simulation show that the proposed LMMSE method achieves exactly the same performance as the conventional LMMSE method, with much lower computational complexity.
    Źródło:
    Journal of Telecommunications and Information Technology; 2022, 1; 72--78
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frictionless contact between a rigid indentor and a transversely isotropic functionally graded layer
    Autorzy:
    Patra, R.
    Barik, S. P.
    Chaudhuri, P. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/947340.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    równanie całkowe Fredholma
    transformacja Hankela
    rozkład naprężeń
    functionally graded material
    transversely isotropic medium
    Hankel transform
    contact problem
    Fredholm integral equation
    Opis:
    This article is concerned with the study of frictionless contact between a rigid punch and a transversely isotropic functionally graded layer. The rigid punch is assumed to be axially symmetric and is supposed to be pressing the layer by an applied concentrated load. The layer is resting on a rigid base and is assumed to be sufficiently thick in comparison with the amount of indentation by the rigid punch. The graded layer is modeled as a non-homogeneous medium. The relationship between the applied load P and the contact area is obtained by solving the mathematically formulated problem through using the Hankel transform of different order. Numerical results have been presented to assess the effects of functional grading of the medium and the applied load on the stress distribution in the layer as well as on the relationship between the applied load and the area of contact.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 655-671
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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