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Wyszukujesz frazę "Selvaraj, H." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Automated Characterization of Atheromatous Plaque in Intravascular Ultrasound Images Using Neuro Fuzzy Classifier
    Autorzy:
    Selvathi, D.
    Emimal, N.
    Selvaraj, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/226334.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Intravascular Ultrasound
    atheromatous plaque
    pixel intensity
    euro fuzzy classifier
    Opis:
    The medical imaging field has grown significantly in recent years and demands high accuracy since it deals with human life. The idea is to reduce human error as much as possible by assisting physicians and radiologists with some automatic techniques. The use of artificial intelligent techniques has shown great potential in this field. Hence, in this paper the neuro fuzzy classifier is applied for the automated characterization of atheromatous plaque to identify the fibrotic, lipidic and calcified tissues in Intravascular Ultrasound images (IVUS) which is designed using sixteen inputs, corresponds to sixteen pixels of instantaneous scanning matrix, one output that tells whether the pixel under consideration is Fibrotic, Lipidic, Calcified or Normal pixel. The classification performance was evaluated in terms of sensitivity, specificity and accuracy and the results confirmed that the proposed system has potential in detecting the respective plaque with the average accuracy of 98.9%.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 4; 425-431
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parallel Computation Approaches to Optimize Learning Systems
    Autorzy:
    Czyż, T.
    Rudek, R.
    Selvaraj, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/226487.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    parallel computation
    metaheuristic
    scheduling
    learning
    Opis:
    This paper is devoted to the total tardiness minimization scheduling problem, where the efficiency of a processor increases due to its learning. Such problems model real-life settings that occur in the presence of a human learning (industry, manufacturing, management) and in some computer systems. However, the increasing growth of significant achievements in the field of artificial intelligence and machine learning is a premise that the human-like learning will be present in mechanized industrial processes that are controlled or performed by machines as well as in the greater number of multi-agent computer systems. Therefore, the optimization algorithms dedicated in this paper for scheduling problems with learning are not only the answer for present day scheduling problems (where human plays important role), but they are also a step forward to the improvement of self-learning and adapting systems that undeniably will occur in a new future. To solve the analysed problem, we propose parallel computation approaches that are based on NEH, tabu search and simulated annealing algorithms. The numerical analysis confirm high accuracy of these methods and show that the presented approaches significantly decrease running times of simulated annealing and tabu search and also reduce the running times of NEH.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 2; 223-228
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel Multi-Exponential Function-based Companding Technique for Uniform Signal Compression over Channels with Limited Dynamic Range
    Autorzy:
    Moazzeni, T.
    Selvaraj, H.
    Jiang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/226887.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    companding
    multi-exponential function
    Mu-law
    quantization
    uniform signal compression
    Opis:
    Companding, as a variant of audio level compression, can help reduce the dynamic range of an audio signal. In analog (digital) systems, this can increase the signal-to-noise ratio (signal to quantization noise ratio) achieved during transmission. The µ-law algorithm that is primarily used in the digital telecommunication systems of North America and Japan, adapts a companding scheme that can expand small signals and compress large signals especially at the presence of high peak signals. In this paper, we present a novel multi-exponential companding function that can achieve more uniform compression on both large and small signals so that the relative signal strength over the time is preserved. That is, although larger signals may get considerably compressed, unlike µ-law algorithm, it is guaranteed that these signals after companding will definitely not be smaller than expanded signals that were originally small. Performance of the proposed algorithm is compared with µ-law using real audio signal, and results show that the proposed companding algorithm can achieve much smaller quantization errors with a modest increase in computation time.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 2; 125-128
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy characteristic of a processor allocator and a network-on-chip
    Autorzy:
    Zydek, D.
    Selvaraj, H.
    Borowik, G.
    Łuba, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/907790.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    wzmacniacz mocy
    model energetyczny
    przydział procesora
    CMP
    PA
    energy model
    processor allocation
    Opis:
    Energy consumption in a Chip MultiProcessor (CMP) is one of the most important costs. It is related to design aspects such as thermal and power constrains. Besides efficient on-chip processing elements, a well-designed Processor Allocator (PA) and a Network-on-Chip (NoC) are also important factors in the energy budget of novel CMPs. In this paper, the authors propose an energy model for NoCs with 2D-mesh and 2D-torus topologies. All important NoC architectures are described and discussed. Energy estimation is presented for PAs. The estimation is based on synthesis results for PAs targeting FPGA. The PAs are driven by allocation algorithms that are studied as well. The proposed energy model is employed in a simulation environment, where exhaustive experiments are performed. Simulation results show that a PA with an IFF allocation algorithm for mesh systems and a torus-based NoC with express-virtual-channel flow control are very energy efficient. Combination of these two solutions is a clear choice for modern CMPs.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2011, 21, 2; 385-399
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical Models for Distribution of the Envelope and Phase of Linearly Modulated Signals in AWGN Channel
    Autorzy:
    Moazzeni, T
    Jiang, Y.
    Selvaraj, H.
    Chen, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/226459.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital modulation
    linear modulation
    probability density function
    phase
    AWGN
    Opis:
    In this paper, analytical expressions for the distribution of the envelope and phase of linearly modulated signals such as BPSK, M-PSK, and M-QAM in AWGN are presented. We perform numerical simulations for different orders of signal constellations. The results show that the proposed theoretical models are in excellent agreement with the estimated distributions from various numerical experiments.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 1; 79-82
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Location of Processor Allocator and Job Scheduler and Its Impact on CMP Performance
    Autorzy:
    Zydek, D.
    Chma, G.
    Shawky, A.
    Selvaraj, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/227230.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CMP
    PA
    JS
    energy
    assignment
    Opis:
    High Performance Computing (HPC) architectures are being developed continually with an aim of achieving exascale capability by 2020. Processors that are being developed and used as nodes in HPC systems are Chip Multiprocessors (CMPs) with a number of cores. In this paper, we continue our effort towards a better processor allocation process. The Processor Allocator (PA) and Job Scheduler (JS) proposed and implemented in our previous works are explored in the context of its best location on the chip. We propose a system, where all locations on a chip can be analyzed, considering energy used by Network-on-Chip (NoC), PA and JS, and processing elements. We present energy models for the researched CMP components, mathematical model of the system, and experimentation system. Based on experimental results, proper placement of PA and JS on a chip can provide up to 45% NoC energy savings.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 1; 9-14
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identifying combination of friction stir welding parameters to maximize strength of lap joints of AA2014-T6 aluminum alloy
    Autorzy:
    Rajendrana, C.
    Srinivasan, K.
    Balasubramanian, V.
    Balaji, H.
    Selvaraj, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/94198.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    friction stir welding
    aluminum alloy
    response surface methodology
    lap joint
    tensile strength
    zgrzewanie tarciowe
    stopy aluminium
    metodologia odpowiedzi powierzchni
    połączenie zakładkowe
    wytrzymałość na rozciąganie
    Opis:
    AA2014 aluminum alloy (Al-Cu alloy) has been widely utilized in fabrication of lightweight structures like aircraft structures, demanding high strength to weight ratio and good corrosion resistance. The fusion welding of these alloys will lead to solidification problems such as hot cracking. Friction stir welding is a new solid state welding process, in which the material being welded does not melt and recast. Lot of research works have been carried out by many researchers to optimize process parameters and establish empirical relationships to predict tensile strength of friction stir welded butt joints of aluminum alloys. However, very few investigations have been carried out on friction stir welded lap joints of aluminum alloys. Hence, in this investigation, an attempt has been made to optimize friction stir lap welding (FSLW) parameters to attain maximum tensile strength using statistical tools such as design of experiment (DoE), analysis of variance (ANOVA), response graph and contour plots. By this method, it is found that maximum tensile shear fracture load of 12.76 kN can be achieved if a joint is made using tool rotational speed of 900 rpm, welding speed of 110 mm/min, tool shoulder diameter of 12 mm and tool tilt angle of 1.5.
    Źródło:
    Archives of Mechanical Technology and Materials; 2017, 37; 6-21
    2450-9469
    Pojawia się w:
    Archives of Mechanical Technology and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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