• Analytical Science and Technology
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• v.29 no.1
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• pp.1-9
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• 2016

It is believed that traditional Korean medicines can be managed more scientifically through the development of logical criteria to verify their region of cultivation, and that this could contribute to the advancement of the traditional herbal medicine industry. This study attempted to determine such criteria for Sansuyu. The volatile compounds were obtained from 20 samples of domestic Corni fructus (Sansuyu) and 45 samples of Chinese Sansuyu by steam distillation. The metabolites were identified in the NIST Mass Spectral Library via the obtained gas chromatography/mass spectrometer (GC/MS) data of 53 training samples. Data binning at 0.2 min intervals was performed to normalize the number of variables used in the statistical analysis. Multivariate statistical analyses, such as principle component analysis (PCA), partial least squares-discriminant analysis (PLS-DA), and orthogonal partial least squares-discriminant analysis (OPLS-DA) were performed using the SIMCA-P software package. Significant variables with a variable importance in the projection (VIP) score higher than 1.0 were obtained from OPLS-DA, and variables that resulted in a p-value of less than 0.05 through one-way ANOVA were selected to verify the marker compounds. Finally, among the 11 variables extracted, 1-ethylbutyl-hydroperoxide (9.089 min), nonadecane (20.170 min), butylated hydroxytoluene (25.319 min), 5β,7βH,10α-eudesm-11-en-1α-ol (25.921 min), 7,9-bis(2-methyl-2-propanyl)-1-oxaspiro[4.5]deca-6,9-diene-2,8-dione (34.257 min), and 2-decyldodecyl-benzene (54.717 min) were selected as markers to indicate the origin of Sansuyu. The statistical model developed was suitable for the determination of the geographical origin of Sansuyu. The cultivation areas of four Korean and eight Chinese Sansuyu samples were predicted via the established OPLS-DA model, and it was confirmed that 11 of the 12 samples were accurately classified.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.248-248
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• 2012

산사태나 토석류와 같은 산지재해가 빈발하고 인명과 재산의 피해가 증가함에 따라 적절한 대책이 시급하게 요구되고 있다. 이런 대책 중에서 신뢰도 높은 산지재해 예, 경보시스템을 구축하는 것은 매우 중요하다. 산림청에서는 산사태 예, 경보 발령을 위한 기준을 마련하고 있으나, 좀더 신뢰도 높은 기준을 필요로 한다고 생각된다. 본 연구에서는 강우분석을 통해서 우리나라의 자연사면에서 토석류, 산사태를 일으키는 강우의 특성을 파악하고, 나아가 산지토사재해 예, 경보시스템에 적절하게 활용될 수 있는 기준을 마련하고자 하였다. 이를 위해서 회귀분석, 판별분석을 적용하여 평가하였고, 보다 개선된 기준으로서 토양우량지수를 제시하였다. 토양우량지수는 강우에 의해 지반이 어느 정도 포화되어 있는가를 계산하여, 토사재해발생의 위험성을 나타낸 것이다. 본 연구에서는 2001년에서 2009년 사이에 충북 제천시 일대의 강우자료를 조사하여 탱크모델에 적용하여 각 탱크에서의 저류량을 계산하여 토양우량지수를 결정하였다. 세 개의 탱크 중에서 두 번째 탱크에서의 저류량 (S2)과 전체 탱크에서의 저류량 (TS)을 이용하여 상위에 랭크된 이력순위를 분석한 결과, S2에서는 산사태가 발생한 2009년 이력이 3번째 높은 수준으로 기록되며, 산사태 미발생의 2007년 강우는 5번째로 기록되었다. 그리고 TS의 경우 2009년 강우가 2002년에 이어 3번째 높은 수준으로 기록되었으며, 2007년 강우는 9번째로 기록되었다. 이러한 결과를 볼 때 토양우량지수의 이력순위는 산지토사재해의 발생을 잘 반영하는 것으로 나타났다. 또한 2011년 발생한 우면산 산사태를 대상으로 토양우량지수를 적용하여 예, 경보시스템의 적용가능성을 판단하였다.

• Journal of Conservation Science
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• v.21
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• pp.89-100
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• 2007

This study analyze concentration of minor and trace elements on 47 white porcelains excavated from Dudong-ri, Baekryeon-ri, Sachon-ri kilns in Gyeonsangnam-do by NAA(neutron activation analysis) and try to classify the provenance and characteristics according to the analytical result. Each kilns are divided into the group by PCA(principal component analysis) and LDA(linear discrimination analysis) using 17 elements; Ba Ce, Co, Cr, Cs, Dy, Eu, Hf, La Lu, Rb, Sc, Sm, Ta, Th, V, Yb. The contribution elements are Dy, Sm, La, Ce, Lu, Sc. And soft and hard white porcelains are similar with the chemical composition of the use materials therefore the difference of the chemical composition not confirmed a cause. The analytical results of the fine(I) and poor(II) quality white porcelains presume the difference of the povenance of clay materials or the poduction process such as difference purify and additive materials.

• Analytical Science and Technology
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• v.14 no.6
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• pp.476-485
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• 2001

Both concave and convex roof-end tiles having same style and shape are excavated in Yongjangsung castle at Jindo and Burnhwasa temple at Wando in Jeollanam-Do that are the Sambyulcho's resistance sites against Mongolia in the late Koryo dynasty. Obtained data by NAA have been used to classify the equality of a raw materials' porvenance by multiple correlation analysis(MCA) and discriminant analysis. The results of MCA has shown that there are very high correlation for [La : Sm], and [Lu : Yb]. Exactly pottery site at Chungdo, roof tile site at Chungyang, Yongjangsung castle and Bumhwasa temple and Chunghaejin site at Jangdo were distributed for four trace elements, Cr, Sc, ${\Delta}$(${\Sigma}$(Lu, Yb)) and Eu by discriminant analysis, and their accuracy is above 95%. This means that Yongjangsung castle and Bumhwasa temple have same raw material's provenance.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.450-450
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• 2015

우리나라는 최근 기후변화로 인한 이상기후의 영향으로 태풍 및 국지성 집중호우의 발생빈도가 잦아지고 있으며, 이에 따른 풍수해 피해 양상 또한 과거와 비교되지 않을 만큼 대형화 되고 있다. 본 연구대상지역인 가곡천 유역은 강원도 산지로부터 발원하여 동해안으로 유입되는 산지하천 중 하나로 유로연장이 짧고 경사가 급하여 홍수기시 홍수도달시간이 매우 짧은 특징을 가지고 있어 하류부에서의 피해가 증가하고 있는 실정이다. 실제로 대상하천의 경우 2002년 태풍루사와 2003년 태풍매미 등에 의해 피해가 컸던 것으로 조사되었으며, 이러한 피해를 저감하기 위해서 정확한 유역의 유출해석이 필요하다. 따라서 본 연구에서는 가곡천 유역의 치수대책 수립을 위한 설계홍수량을 산정하기 위해 GIS 수문프로그램인 WMS(Watershed Modeling System)를 이용하여 수문해석에 필요한 수문인자들을 추출하고, WMS에 내장되어 있는 HEC-1 모형을 이용하여 유출해석을 수행하였다. 가곡천 유역에 대한 모형의 적합성 여부를 판별하기 위해 실제측정에 의해서 만들어진 수위-유량관계곡선과의 비교를 통해 모형의 적합성 여부를 검토하였다.

• Journal of Korean Society of Forest Science
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• v.83 no.2
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• pp.175-190
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• 1994

In order to get fundamental information for prediction of landslide hazard, both forest and site factors affecting slope stability were investigated in many areas of active landslides. Twelve descriptors were identified and quantified to develop the prediction model by multivariate statistical analysis. The main results obtained could be summarized as follows : The main factors influencing a large scale of landslide were shown in order of precipitation, age group of forest trees, altitude, soil texture, slope gradient, position of slope, vegetation, stream order, vertical slope, bed rock, soil depth and aspect. According to partial correlation coefficient, it was shown in order of age group of forest trees, precipitation, soil texture, bed rock, slope gradient, position of slope, altitude, vertical slope, stream order, vegetation, soil depth and aspect. The main factors influencing a landslide occurrence were shown in order of age group of forest trees, altitude, soil texture, slope gradient, precipitation, vertical slope, stream order, bed rock and soil depth. Two prediction models were developed by magnitude and frequency of landslide. Particularly, a prediction method by magnitude of landslide was changed the score for the convenience of use. If the total store of the various factors mark over 9.1636, it is evaluated as a very dangerous area. The mean score of landslide and non-landslide group was 0.1977 and -0.1977, and variance was 0.1100 and 0.1250, respectively. The boundary value between the two groups related to slope stability was -0.02, and its predicted rate of discrimination was 73%. In the score range of the degree of landslide hazard based on the boundary value of discrimination, class A was 0.3132 over, class B was 0.3132 to -0.1050, class C was -0.1050 to -0.4196, class D was -0.4195 below. The rank of landslide hazard could be divided into classes A, B, C and D by the boundary value. In the number of slope, class A was 68, class B was 115, class C was 65, and class D was 52. The rate of landslide occurrence in class A and class B was shown at the hige prediction of 83%. Therefore, dangerous areas selected by the prediction method of landslide could be mapped for land-use planning and criterion of disaster district. And also, it could be applied to an administration index for disaster prevention.

• Proceedings of the KIEE Conference
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• 2003.07c
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• pp.1768-1769
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• 2003

가스절연개폐장치(Gas-insulated Switchgear, GIS)의 예방진단 기술의 한 방법으로, 극 초단파(Ultrahigh frequency) 부분방전(Partial discharge) 센서를 사용하여 결함의 유무를 판별할 수 있다. 그러나 UHF PD 센서에는 부분방전신호 이외에 외부 잡음의 유입 가능성이 크다. 따라서 본 논문에서는 PD 센서 주변 잡음을 측정하기 위하여 $0{\sim}2$ GHz 의주파수영역에서 산지, 도심 지역의 변전소의 위치에 따른 외부 잡음을 측정하였다. 주파수 대역별로 FM 방송, TV 방송, 이동전화, 등의 신호를 판별하였다.

• Korean Journal of Food Science and Technology
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• v.30 no.5
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• pp.1051-1057
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• 1998

The discrimination of the agricultural origin, especially locally produced or imported from the products such as Ganoderma lucidum, sesame and arrowroot were investigated by using the electronic nose. Volatile components from these products were discriminated by twelve of conducting polymer sensors without any pretreatment. Pattern recognition was carried out. Multiple discriminant analysis showed the difference between imported agricultural product and locally produced ones such as Ganoderma lucidum, sesame and arrowroot. Unknown habitat of sesame and arrowroot could be identified by multiple discriminant analysis whether the imported or the locally produced one.

• Korean Journal of Food Science and Technology
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• v.34 no.1
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• pp.136-139
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• 2002

The discrimination of the agricultural origin, especially locally produced of imported products such as black rices was investigated by using electronic nose. Volatile components from these products were discriminated by six metal oxide sensors without pretreatment. Pattern recognition was carried out. Principal component analysis showed the differences between imported and locally produced ones. The number of 57 from 69 species of black rices were recognized as locally produced one (83.33%) and 11 from 13 species one (imported black rices) was correctly discriminated. Unknown habitat of black rice could be identified by artificial neural network system whether the imported or not. Also commercial electronic nose (E-nose 5000) that was combined with metal oxide sensor and conducting polymer sensor showed 92.75% (locally produced black rices) and 92.31% (imported one) of discrimination.

• Journal of Conservation Science
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• v.26 no.4
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• pp.459-465
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• 2010

The 5th century kiln that produced pottery coffins was found for the first time in Korea, located in the Oryang-dong remains in the city of Naju. This kiln, located in the central area of the Yeongsan River, provides important data for research on mortuary practices in prehistoric society, including the structure of production and patterns of distribution and consumption. For this study, the remains of five ancient tombs and pottery coffins excavated from the 4th century Mandong archaeological site were chosen to determine the area of consumption of pottery coffins produced at the Oryang-dong kiln. The samples from each area of remains were analyzed for minor elements using neutron activation analysis method, and from these results, the identities of the corresponding production areas were investigated using the multi-variant statistical analysis of discriminant analysis. The evidence strongly suggests that pottery coffins produced at the Oryang-dong kiln in Naju were used in ancient tombs of the Bannam mound in Naju, the Okyari mound in Yeongam, and the Banam mound in Hampyeong, reaching those sites through trade and distribution. The findings also suggest that pottery coffins from the Mandong archeological site in Gochang and the Inpyeong mound in Muan were not produced at the Oryang-dong kiln in Naju, but rather were brought from pottery kilns in different production areas, through trade and distribution.