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    THz frequency generation using Gaussian pulse for medical applications
    (2013-03-01)
    Afroozeh, A.
    ;
    Innate, K.
    ;
    Ali, J.
    ;
    Yupapin, P. P.
    We propose a new design of THz frequency carrier generation for medical applications. The dense wavelength division multiplexing can be generated by using a Gaussian pulse propagating within a modified PANDA ring resonator and add-drop filter. Results obtained have shown that broad region of frequency band can be obtained between 30 and 100 THz. This area of frequency band can be useful for medical applications, in which the broad bandwidth of THz signals can be obtained and available for medical applications, for instance, the use of Terahertz pulse imaging (TPI) and signal transduction therapy, especially, for blood vessel extraction are discussed. © 2012 Elsevier GmbH. All rights reserved.
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    Heart detection and diagnosis based on ECG and EPCG relationships
    (2011-08-26)
    Phanphaisarn, W.
    ;
    Roeksabutr, A.
    ;
    Wardkein, P.
    ;
    Koseeyaporn, J.
    ;
    Yupapin, PP
    A new design of a system for preliminary detection of defective hearts is proposed which is composed of two subsystems, in which one is based on the relationship between the electrocardiogram (ECG) and phonocardiogram (PCG) signals. The relationship between both signals is determined as an impulse response (h(n)) of a system, where the decision is made based on the linear predictive coding coefficients of a heart's impulse response. The other subsystem uses a phase space approach, in which the mean squared error between the distance vectors of the phase space of the normal heart and abnormal heart is judged by the likelihood ratio test (Λ) value, on which the decision is made. The advantage of the proposed system is that a heart's diagnosis system based on the ECG and EPCG signals can lead to high performance heart diagnostics. © 2011 Phanphaisarn et al, publisher and licensee Dove Medical Press Ltd.
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