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RISS 인기검색어
- 검색키워드
- 저자 : Olga L. Ramos (검색결과 2 건)
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Pre-emphasis, Windowing and Spectral Estimation of Silent Speech Signals Using Embedded Systems
Leonardo A. Góngora,Dario Amaya,Olga L. Ramos 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.10
The feature extraction process is the fundamental stage in the development of speech processing systems. In this paper is described the methodology and implementation of an embedded algorithm for extracting characteristic information from silent speech signals. The classical approach based on frequency representations of the signals is followed as methodology for this work. First, the acquisition stage of the silent speech signals is performed using a Non-Audible Murmur microphone and the STM32F4Discovery evaluation board. Then, the digitalized signal is filtered, segmented and normalized using the pre-emphasis and windowing steps. The magnitude spectrogram is calculated from the pre-processed signal using the Fast Fourier Transform (FFT), to finally estimate characteristic data from de silent speech signal. As result of this process, the signal characteristic parameters, defined in the frequency domain are obtained and used as elements at later stages of pattern recognition, in order to build systems of Automatic Speech Recognition (ASR), Speech Coding, Speaker Recognition, among other applications.
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Lycopene Improves Diet-Mediated Recuperation in Rat Model of Nonalcoholic Fatty Liver Disease
Rosa Maria Pina-Zentella,Jorge L. Rosado,Marco A. Gallegos-Corona,Luis Alberto Madrigal-Perez,Olga P. Garcia,Minerva Ramos-Gomez 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.6
The aim of the present study was to evaluate the synergic effect of lycopene (LYC) treatment with a dietary control in a nonalcoholic fatty liver disease (NAFLD) model induced with a high-fat diet (HFD). Sprague–Dawley rats were fed during 4 weeks with a normal diet (ND·4w) or an HFD (HFD·4w) to produce an NAFLD model. Then, rats from the ND·4w group continued during 4 weeks with the same diet (ND·8w), and rats from HFD were fed during 4 weeks with an ND (HFD·4w+ND·4w) or an ND plus LYC (HFD·4w+ND+LYC·4w). LYC (20 mg/kg) was administered daily by gavage. ND and ND+LYC diets partially reverted the following alterations due to HFD: liver weight, serum low-density lipoproteins (LDL), hepatic total cholesterol (TC), and catalytic activity of hepatic superoxide dismutase, catalase, and glutathione peroxidase, as well as macroscopic and microscopic images of livers. A higher recuperation to reach normality was obtained with ND+LYC in: liver weight, hepatic TC, serum LDL, and, in some instances, macroscopic and microscopic images of livers. Failures to recovery with both NDs were observed for malondialdehyde level and serum aspartate aminotransferase activity. Taken together, the results from this study suggest the potentially protective role of LYC against NAFLD; however, more clinical trials are needed to support this idea.
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