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포만트 기반의 가우시안 분포를 가지는 필터뱅크를 이용한 멜-주파수 켑스트럴 계수
손영우,홍재근,Son, Young-Woo,Hong, Jae-Keun 한국음향학회 2006 韓國音響學會誌 Vol.25 No.8
음성인식의 특징벡터로서 멜-주파수 켑스트럴 계수 (MFCC, mel-frequency cepstral coefficients)가 가장 널리 사용되고 있다. FMCC 추출과정은 입력되는 음성신호를 푸리에 변환한 후, 주파수 대역별로 필터를 취하여 에너지 값을 구하고 이산 코사인 변환을 하여 그 계수 값을 구한다. 본 논문에서는 멜-스케일 된 주파수 대역필터를 취할 때 가중함수에 의해서 구해진 각 대역필터별 가중치를 적용하여 필터의 출력 에너지를 계산한다. 여기서 가중치를 구하기 위해 사용된 가중함수는 포만트가 존재하는 대역을 중심으로 인접한 대역들이 가우시안 분포를 가지는 함수이다. 제안한 방법으로 실험한 결과, 잡음이 거의 없는 음성신호에 대해서는 기존의 MFCC를 사용했을 때와 비슷한 인식률을 보이고 잡음성분이 많을수록 가중치가 적용된 방법이 인식률에서 보다 높은 성능 향상을 가져온다. Mel-frequency cepstral coefficients are widely used as the feature for speech recognition. In FMCC extraction process. the spectrum. obtained by Fourier transform of input speech signal is divided by met-frequency bands, and each band energy is extracted for the each frequency band. The coefficients are extracted by the discrete cosine transform of the obtained band energy. In this Paper. we calculate the output energy for each bandpass filter by taking the weighting function when applying met-frequency scaled bandpass filter. The weighting function is Gaussian distributed function whose center is at the formant frequency In the experiments, we can see the comparative performance with the standard MFCC in clean condition. and the better Performance in worse condition by the method proposed here.
보문 : 염모제 성분인 카드뮴의 세포독성에 대한 시엽추출물의 영향
손영우 ( Young Woo Son ),임요섭 ( Yo Sup Rim ),유영월 ( Yeong Wol Yu ),정인주 ( In Ju Jung ) 대한미용학회(구 대한미용과학회) 2012 대한미용학회지 Vol.8 No.1
This study was carried out to investigate the cadmium (Cd)-induced cytotoxicity and the protective effect of persimmon leaves (PL) extract on the toxic effect induced by cadmium chloride (CdCl2) in cultured human skin fibroblasts (Detroit 551). In this study, CdCl2 showed the cytotoxicity by a significant decrease of the cell viability and cell adhesion activity (CAA). While, vitamin E as antioxidant protected CdCl2-induced cytotoxicity by the increase of CAA which was decreased by CdCl2. In the protective effect of PL extract against CdCl2-induced cytotoxicity, PL extract blocked CdCl2-induced cytotoxicity by the a significant increase of CAA as well as superoxide dismutase (SOD)-like activity and inhibitory activity of lipid peroxidation (LP). From these results, it is suggested that the cytotoxicity of CdCl2 is involved in oxidative stress, and PL extract showed the antioxidative effect by showing not only a significant increase of CAA but also SOD-like activity and inhibitory activity of LP. Conclusively, the physioactive components such as PL extract may be a putative beauty resources for the diminution or blocking the cytotoxicity or oxidative stress mediated by heavy metals or chemicals which are the materials of hair dyes or cosmetics.
프랙탈 차원과 어트랙트를 이용한 한글 혼동 문자 인식에 관한 연구
손영우(Son Young Woo),남궁재찬(Namkung Jae Chan) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.7
In this paper, to reduce misrecognized characters, we propose the new method that extract features from character to apply to the character recognition using fractal dimensions and attractors. Firstly, to reduce the load of recognizer we classify the characters. For the classified character, we extract the features for Box-counting dimensions, Natural Measures, Information dimensions then recognize characters. With histogram, we generate attractors and calculate dimensions from attractors. Then we recognize characters with dimensions of characters and attractors. An experimental result that the overall recognition rates for the training data and testing data are 96.03% and 91.74% respectively. This result shows the effectiveness of proposed method.
보문 : 애기똥풀 추출물이 정균제인 수은의 항산화 및 멜라닌화에 미치는 영향
손영우 ( Young Woo Son ),오성균 ( Seong Kyun Oh ),최유란 ( Yu Ran Choi ),박신희 ( Shin Hee Park ),서영미 ( Young Mi Seo ),이화정 ( Hwa Jeong Lee ),정인주 ( In Ju Jung ) 대한미용학회(구 대한미용과학회) 2013 대한미용학회지 Vol.9 No.3
본 연구는 미용제에서 정균제 기능을 가지고 있는 수은에 대한 세포독성을 산화적 손상 측면에서 조사하기 위하여 배양 인체피부흑색종세포 (SK-MEL-3)를 사용하여 HgCl2의 독성을 산화적 손상 측면에서 조사하고 이와 동시에 수은의 독성에 대한 CM 추출물의 영향을 항산화 및 멜라닌화에 대하여 분석함으로서 미용소재로서의 효능을 알아보고자 하였다. To clarify the effect of Chelidonium majus (CM) extract on mercury (Hg)-induced cytotoxicity and melanogenesis, cell viability was done by XTT assay after human skin melanoma cells (SK-MEL-3) were cultured in media containing various concentrations of mercuric chloride (HgCl2). And also, the effect of vitamin E on HgCl2-induced cytotoxicity was assessed. For the protective effect of CM extract on HgCl2-induced cytotoxicity and melanogenesis, SK-MEL-3 cells were pretreated with 50 or 80 μg/mL of CM extract for 2 hours, and also, the lactate dehydrogenase (LDH) activity for antioxidative effect as well as the melanin synthesis and tyrosinase activity for the melanogenesis on CM extract were analysed. In this study, HgCl2 significantly decreased cell viability in dose-dependent way compared with control, and the XTT50 value was calculated at 29.1 μM of HgCl2. In the protective effect of vitamin E, it effectively prevented HgCl2- induced cytotoxicity by a significant increase of cell viability. In the protective effect of CM extract on HgCl2-induced cytotoxicity, CM extract significantly increased cell viability which was decreased by HgCl2-induced cytotoxicity, and also it showed the inhibitory effect of LDH activity. While, in the melanogenesis of CM extract, CM extract remarkably decreased melanin synthesis and tyrosinase activity compared with HgCl2-treated group. From these results, it suggested that HgCl2-induced cytotoxicity was involved in oxidative stress, and also, CM extract effectively prevented HgCl2- induced cytotoxicity and melanogenesis. Conclusively, plant extract such as CM may be a putative beauty resources for the prevention or diminution of the toxicity or melanogenesis induced by heavy metals correlated with oxidative stress.