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1996년 춘계학술대회 학술퀴즈 : 다발성 임파절 이상증을 동반한 비대칭적 폐 간질성 병변
이경상 ( Kyung Sang Lee ),양석철 ( Suck Chul Yang ),윤호주 ( Ho Joo Yoon ),신동호 ( Dong Ho Shin ),박성수 ( Sung Soo Park ),이정희 ( Jung Hee Lee ),김혁 ( Hyuk Kim ),최요원 ( Yo Won Choi ),전석철 ( Seok Chol Jeon ) 대한결핵 및 호흡기학회 1996 Tuberculosis and Respiratory Diseases Vol.43 No.4
만성 간질환에서의 ICG - Rmax 와 Thallium - 201 Test per Rectum ( Sunt Index ) 의 임상적 의의
이경상(Kyung Sang Lee),황선호(Seon Ho Hwang),함준수(Joon Soo Hahm),이종철(Jong Chul Rhee),기춘석(Choon Suhk Kee),박경남(Kyung Nam Park),이민호(Min Ho Lee),정화순(Wha Soon Chung),조석신(Seok Shin Cho),이재원(Jae Won Lee) 대한내과학회 1994 대한내과학회지 Vol.46 No.1
N/A Objectives: Thallium-201 test per rectum (shunt index) and ICG-Rmax have been used for studying the portosystemic shunt and the functional reserve of liver. The clinical values of shunt index and ICG-Rmax in pateints with chronic liver disease were evaluated using the data obtained in 74patients. Methods: 0.5mCi thallium-201 was administered per rectum to 37 patients witchronic active hepatitis (CAH) and 37Patients with liver cirrhosis, and the heart to liver uptake ratio was taken at 20min. ICG-Rmax was also taken using Paumgartner`s method. We used simple linear regression and ANOVA methods for the correlation between ICG Rmax and shunt index. Results: 1) The mean shunt index was 0.251±0. 140 in CAH group and 0.565±0.351 in cirrhosis group (P<0,005). 2) The mean ICG-Rmax was 1.720±l.320 (mg/kg/ min) in CAH group and 0.867±0.625 in cirrhosis group (P<0 005). 3) There was no significant correlation between ICG- Rmax and shunt index in CAH group (P=0.358). 4) Correlation between ICG-Rmax and shunt index was significant in cirrhosis group (P=0,001; R-square= 0 321; 1/ICG-Rmax=2 64 * shunt index+0.49) Conclusions: Thallium-201 scintigraphy per rectum and ICG-Rmax may be useful in diagnosis of chronic liver diseases, especially differentiating CAH from cirrhosis. These study will help us to predict the prognosis of chronic liver diseases and give us more information for the treatment of chronic liver diseases.
PSCAD/EMTDC를 이용한 측정기반의 부하모델링 연구
이경상(Kyung-Sang Lee),박래준(Rae-Jun Park),송경빈(Kyung-Bin Song) 대한전기학회 2011 전기학회논문지 Vol.60 No.6
To supply electrical power with high quality, the power system must be optimized in many ways such as planning, control and management. In order to optimize the power system, the analysis of the power system is necessary. The elements of the power system require an accurate model to analysis of the power system. The components of the power systems such as generators, transformers and transmission lines have been studied and researched a lot in their modeling and very sophisticated models have been proposed. However, in case of load in-depth studies on the exact model are required. In this paper, measurement-based load modeling method using real-time measured data is proposed in various methods to reflect the characteristics of the load. To prove the validity of the proposed method, PSCAD/EMTDC program is used to configure the power system and measurement data according to the various failures are used to study on load modeling.
시계열 패턴 반응형 Low-peak 탐지 기법을 통한 NDVI 보정방법 개선
이경상 ( Kyeong Sang Lee ),한경수 ( Kyung Soo Han ) 대한원격탐사학회 2014 大韓遠隔探査學會誌 Vol.30 No.4
NDVI는 기후변화 모니터링과 식생 변화 탐지 모니터링을 위한 주요한 지표이다. NDVI를 산출하기 전에 cloud masking, 대기보정과 같은 전처리 과정을 거침에도 불구하고 강수, 적설이나 구름의 영향이 완전히 제거되지 않아 NDVI가 현저히 낮게 관측되는 noise가 불규칙적으로 발생한다. 이러한 noise를 보정하기 위해서 국내외로 활발한 연구가 진행되고 있다. 기존의 다중 다항 회귀식을 이용한 방법에서는 과대추정이나 low peak를 잘 탐지하지 못하는 등 문제점이 나타나고 있으므로 보다 정확하게 noise를 보정하는 방법이 요구된다. 본 연구에서는 이동평균을 이용하여 noise를 보정하였고, 기존의 다중 다항 회귀식을 이용하여 산출한 NDVI 시계열과 비교를 해보았다. 그 결과 이동평균을 이용한 방법이 이전의 방법보다NDVI noise를 잘 보정하는 것으로 보여진다. Normalized Difference Vegetation Index (NDVI) is a major indicator for monitoring climate change and detecting vegetation coverage. In order to retrieve NDVI, it is preprocessed using cloud masking and atmospheric correction. However,the preprocessed NDVI still hasabnormally low values known as noisewhich appears in the long-term time seriesdue to rainfall, snow and incompletecloud masking. An existing method of using polynomial regression has some problems such asoverestimation and noisedetectability.Thereby, this study suggestsasimple method using amoving average approach for correcting NDVI noises using SPOT/VEGETATION S10 Product. The results of the moving average method were compared with those of the polynomial regression. The results showed that the moving average method is better than the former approach in correcting NDVI noise.
문우남,이경상,Moon, Woo-Nam,Lee, Kyung-Sang 대한족부족관절학회 2001 대한족부족관절학회지 Vol.5 No.1
Objectives: This study was done to determine the prevalence of radiographic ankle osteoarthritis (OA) in Korean women with clinical primary ankle OA. Methods: This analysis involved 160 Korean women who visited our out patient clinic due to ankle joint pain. Ankle AP and lateral weight-bearing radiographs were evaluated retrospectively to check whether they have radiographic OA or not. Radiographs were read for features of ankle OA using School classification. Demographic factors and radiographic findings in both radiographic ankle OA group and non-radiographic ankle OA group were analyzed by the student t-test, the chi square test and the Pearson's analysis. A p value <0.05 was considered significant. Results: The prevalence of radiographic ankle OA in Korean women is 18.2 % in patient between 18 and 39 years and is 55.6 % in patient over 40. There was significant difference between two groups with age (P<0.001) and relatively strong correlation between radiographic OA and age (r=0.474, P<0.001). Conclusion: These results show that the prevalence of Korean women with radiographic changes of ankle OA was 45 % and there was relatively strong correlation between age and radiographic ankle OA.
유전자 검사 및 연구의 윤리적 문제와 유전치료의 문제: 유전자 결정론을 중심으로
최경석 ( Kyung Suk Choi ),김중호 ( Joong Ho Kim ),이경상 ( Kyung Sang Lee ),구인회 ( In Hoe Ku ) 한국의료윤리학회 2006 한국의료윤리학회지 Vol.9 No.2
Advances in the life sciences have increased our knowledge of the human genome, which in turn has given rise to worries as well as expectations over future societies. Genetic determinism is one of the philosophical sources of these worries and expectations. The purpose of this study is to describe two types of genetic determinism, strong and moderate, and then analyze the causal power of genes from the point of view of both of these theories. Genetic determinism holds that genotypes determine phenotypes. Strong and moderate genetic determinism differ on the question of whether there exist possible defeating factors. However, neither type of genetic determinism is plausible because of the complicated nature of the causal relationships between genotypes and phenotypes. Only when genes function as sufficient conditions, and not merely as necessary conditions, can they determine phenotypes. In addition, since defeating factors may exist, it is unlikely that each genotype determines its relevant phenotype. If genetic determinism is not plausible, the common view of genes must be corrected. Most research on the relationship between genotypes and phenotypes are about correlations, expressed with probabilities, rather than casual relations. This means that the interpretations of genetic experts are necessary. In addition, whether genetic determinism is plausible or not, individuals should not be stigmatized for having certain genotypes. If genetic research is about correlations, gene therapy research should be carried out with great caution based initially on animal studies. We may learn more about the complicated causal roles of genes from these correlations. From such knowledge, we may intervene in the causal chains in which genes are involved. In doing such research, patient confidentiality must be protected.