• Proceedings of the KSRS Conference
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• 2007.10a
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• pp.468-470
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• 2007

This paper is to present an approach for generating coarse resolution (MODIS data) fraction images of forested region in Korea peninsula using forest type area fraction derived from high resolution data (ASTER data) in regional forest area. A 15-m spatial resolution multi-spectral ASTER image was acquired under clear sky conditions on September 22, 2003 over the forested area near Seoul, Korea and was used to select each end-member that represent a pure reflectance of component of forest such as different forest, bare soil and water. The area fraction of selected each end-member and a 500-m spatial resolution MODIS reflectance product covering study area was applied to a linear mixture inversion model for calculating the fraction image of forest component across the South Korea. We found that the area fraction values of each end-member observed from high resolution image data could be used to separate forest cover in low resolution image data.

• Korean Journal of Pharmacognosy
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• v.30 no.3
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• pp.290-294
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• 1999

From the legumes of Albizzia julibrissin Durazzini (Leguminosae), a mixture of long-chain alcohols, ${\alpha}-spinasterol$, a mixture of acylated sterol glycosides and ${\alpha}-spinasteryl$ $3-O-{\beta}-D-glucoside$ were isolated. Two mixtures of long-chain alcohols and acylated sterol glycosides were characterized as 1-hexacosanol (major) and 1-tetracosanol, and $3-O-[6'-O-palmitoyl-{\beta}-D-glucosyl]-{\alpha}-spinasterol$ (major) and its 6'-O-stearoyl ester. All compounds were identified on the basis of spectral data and chemical reactions.

• Proceedings of the KSLP Conference
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• 2003.11a
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• pp.149-149
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• 2003

후두질환 감별용 음성 분석방법인 multi-dimensional voice program (MDVP)으로 분석이 불가능할 정도로 주기성이 크게 훼손된 후두암 말기의 음성 에 대하여 효과적인 감별을 하기 위하여, 몇 가지 켑스트럼(cepstrum) 파라미터를 비롯하여, 주기성 및 그 동요 정도, 영교차율(zero-crossing rate, ZCR), 스텍트럼 중심 (spectral centroid, SC) 등 다양한 특징 파라미터를 이용한 감별 실험을 수행하였다. 후두암 감별 실험을 위해 부산대학교 병원 이비인후과에서 수집한 정상 남자 음성 데이터 50개, 양성 후두질환 남자 음성 데이터 50개 및 남성 후두암 환자 음성 데이터 105개를 사용하였다. 음성 데이터는 단모음 /아/ 발성만을 사용하였고, 정상인과 양성후두질환 환자, 그리고 MDVP 분석이 가능한 후두암 환자 음성 데이터 중 2/3는 학습에, 나머지 113은 감별실험에 사용하였다. 후두암 감별을 위한 분류기로는 Gaussian Mixture Model(GMM) 분류기를 사용하였으며, 이때 모델의 복잡도를 표현하는 mixture 수는 1에서 10까지 가변시키면서 가장 좋은 성능을 나타내는 값으로 결정하였다. 또한 모든 실험에서 켑스트럼 분석의 차수는 동일하게 12차로 고정시켰다. (중략)

• Korean Journal of Pharmacognosy
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• v.18 no.3
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• pp.177-179
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• 1987

From the roots of Rosa rugosa(Rosaceae), (+)-catechin, and a mixture of ${\beta}-sitosterol$ and campesterol glucosides were isolated and characterized by the physicochemical and spectral data.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.522-524
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• 2012

For exact classification of the defect, good feature selection and classifier is necessary. In this paper, various features such as brightness features, shape features and statistical features are stated and Bayes classifier using Gaussian mixture model is used as classifier. Also feature extraction method based on spectral graph theory is presented. Experimental result shows that feature extraction method using graph Laplacian result in better performance than the result using PCA.

• YAKHAK HOEJI
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• v.46 no.2
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• pp.98-101
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• 2002

The phytochemical study of nutmeg, the seeds of Myristica fragrans Houttuyn (Myristicaceae) led to the isolation of three lignans, safrole (I), macelignan (III), and a 3,4 : 3',4'-bis(methylenedioxy)lignan (II). The compound II was identified by a mixture (1:1) of (8S, 8'R)- and (8S, 8'S)-forms of bis(3, 4-methylenedioxy)-8, 8'-neolignan by $^1$H-, $^{13}$ C-NMR and $^1$H-$^1$H COSY spectral data. The compound II was isolated for the first time from Myristica fragrans.

• Korean Journal of Pharmacognosy
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• v.20 no.3
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• pp.145-146
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• 1989

A furostanol glycoside, $mp\;190{\sim}198^{\circ}$, was isolated from the MeOH extract of Smilax china rhizomes. The structure was established as a mixture of $26-O-{\beta}-_D-glucopyranosyl-(25R)-22-methoxy-furost-5-en-3\beta,26-diol\;3-O-\alpha-_L-rhamnopyranosyl-(1\rightarrow2)-\beta-_D-glucopyranoside$ and its 22-hydroxy derivative on the basis of spectral data and chemical correlations.

• Journal of Photoscience
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• v.9 no.2
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• pp.370-372
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• 2002

In order to investigate effect of the carotenoids (Car) on aggregation of Bacterochlorophyll (BChl) in chlorosome, we studied the spectral difference in aggregates of BChl e formed in the absence and presence of a few kinds of Car in dimethyl sulfoxide (DMSO) -water solution. The absorption spectra of aggregates made of only BChl e and those made of a mixture of BChl e and Car were almost the same. However, the kinetics and circular dichroism (CD) spectra of aggregate of these were markedly different by kind of Car. Specifically, the rate of aggregation for a mixture of BChl e and isorenietene that contains phenyl as end groupe was faster than that for only BChl e. CD spectra of aggregates made of a mixture of BChl e and isorenietene dramatically changed compared to that made of only BChl e. We propose that BChl might form several kinds of rod-like supramolecular structures to in the presence of some kind of Car in chlorosome.

• Proceedings of the KIEE Conference
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• 2002.07c
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• pp.1890-1892
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• 2002

The technology of sulfur lamps that has physical and electrical characteristics comparable to current HID source has been reported. The fundamental principles of the operation of microwave discharges that are used to convert microwave energy to broad spectrum visual light are known. In this paper, emission dependance of microwave discharges in mixture content of sulfur with noble gases was studied. It is shown that the excitation of this gaseous mixture is carried out in two phases: (l) ionization of noble gas atoms by a microwave field and (2) the consequent maintenance of slightly ionized nonequilibrium plasma by the field. These two processes have essentially various thresholds for the microwave pump. The purpose of this work is to investigate spectral properties of the high frequency discharges in a mixture sulfur vapors with noble gases.

• Journal of The Korean Society of Grassland and Forage Science
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• v.34 no.3
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• pp.214-218
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• 2014

This study was conducted to assess the feasibility of near-infrared reflectance spectroscopy (NIRS) as a rapid and reliable method for the estimation of crude protein (CP) fractions in forage legume mixtures (sudangrass and pea mixture, and kidney bean and potato mixture). A total of 178 samples were collected and their spectral reflectance obtained in the range of 400~2,500 nm. Of these, 50 samples were selected for calibration and validation, and 35 samples were used for calibration of the data set, and the modified partial least square regression (MPLSR) analysis was performed. The correlation coefficient ($r^2$) and the standard error of cross-validation (SECV) of the calibration models in the CP fractions, A, B1, B2, B3, and C, were 0.94 (1.05), 0.92 (0.74), 0.96 (0.95), 0.91 (0.42), and 0.83 (0.38), respectively. Fifteen samples were used for equation validation, and the $r^2$ and the standard error of prediction (SEP) were 0.87 (1.45), 0.91 (0.49), 0.94 (1.13), 0.36 (0.96), and 0.74 (0.67), respectively. This study showed that NIRS could be an effective tool for the rapid and precise estimation of CP fractions in forage legume mixtures.