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유단희 ( Dan Hee Yoo ),이인철 ( In Chul Lee ) 대한미용학회 2021 대한미용학회지 Vol.17 No.4
In the current study, we investigated the biological activities of ethanol extract of unripe Mangifera indica L. var. Irwin using a variety of in vitro and cell culture model systems for investigation of the anti-inflammatory and whitening effects. A total polyphenol, electron donating, 2, 2’-azinobis [3-ethylbenzothiazoline-6- sulfonic acid] (ABTS) radical scavenging assay was used for measurement of the antioxidant activities of unripe Mangifera indica L. var. Irwin. The content of phenolic compounds in unripe Mangifera indica L. var. Irwin was 121.47±0.47 mg/100 g. In measurement of electron donating and ABTS radical scavenging ability of unripe Mangifera indica L. var. Irwin, the effect was shown in a concentration-dependent manner. Inhibition of tyrosinase activity was 40.69% at 1,000 μg/ mL concentration of unripe Mangifera indica L. var. Irwin. An MTT assay was used to evaluate cell viability in order to evaluate the anti-inflammatory and whitening effects of unripe Mangifera indica L. var. Irwin in macrophages (RAW 264.7 cells) and melanoma (B16F10 cells). The result showed more than 95% at a concentration of 500 μg/ mL in RAW 264.7 cells and more than 95% at a concentration of 100 μg/mL in B16F10 cells. Nitric oxide inhibitory activity was confirmed for measurement of anti-inflammatory activity. Consequentially, unripe Mangifera indica L. var. Irwin showed an inhibitory effect of 62.64% at a concentration of 500 μg/mL. The amount of melanin production was measured in order to confirm the whitening effect; the inhibitory effect was 15.16% at a concentration of 100 μg/ mL. Thus, unripe Mangifera indica L. var. Irwin could be applied as an anti-inflammatory and whitening effect and could be used in the future as a safe, natural material for use in cosmetics.
십이지장 궤양 발생에 있어서 H . pylori와 위상피화생의 연관에 대한 연구
박선미(Seon Mee Park),양석균(Suk Kyun Yang),홍원선(Weon Seon Hong),민영일(Young Il Min),이인철(In Chul Lee) 대한소화기학회 1995 대한소화기학회지 Vol.27 No.6
N/A Background/Aims: H. pylori infection and gastric metaplasia are frequently associated in patients with duodenal ulcers. However, the pathogenesis of duwlenal ulcer in relation to H, pilori infecri<in and gastric metaplasia has not reacbed a consistent result, yet. The aim of this study v,as to assess whether H. pylori infection and gastric metapla.ia contrihute to duodenal ulcerogenesis. Methods: Multiple endoscopic biopsy specimens were tnken frorn duodenum and gastric antrum of ?I subjects(21 active duodenal ulcers; 30 scarred duodenal ulcers; 20 normal controls). The specimens were examined histologically for the presence ot' H. pylori, gastric metaplasia, and degree of gastritis and duodenitis. Rapid tissue urease test was performed t'or detection of H, pi krri infc cti<in. Results: The positive rate of H. pylrri in gastric antrurn was not significantly different aniong ttlTCC groups, while it was increasing in duodenum, I,e., normal controls(3%'), scarred DU's(37,r), active DU's(62%) in ascending order. The incidence of duodenal gastric metaplasia in the active DU'.I was 95.2% in contrast with the scarred duodenal ulcer's(72.07<) and the nonnal contrnls(2i.04) Diffuse gastric metaplasia lesions were more prevalent in active duodenal ulcers. 1n the duodenum, a strong association was shown between the H. pylrri and gastric rnetaplasia. The severity ot' duodenitis were significantly increased in the order ot' groups of normal controls, scarrecl duodena1 ulcers, and active duodenal ulcers. In duoclenum, there was a strong association with the grade c>f' intlammation anci H. pylori. Conclusions: These results suggest that gaslric metaplasia in the duodenum and concurrent H. pilori infection may play a synergistic role in the pathogene.I. Vt' duodenal ulcer. (Korean J Gastroenterol 199S;27: 617-62S)
터빈 블레이드 회전수 변화와 터빈 블레이드 엣지 형상 변화에 따른 표면 가스온도 분포 해석
이인철(In Chul Lee),변용우(Yong Woo Byun),구자예(Ja Ye Koo),이상도(Sang Do Lee),김귀순(Kui Soon Kim),문인상(In Sang Moon),이수용(Soo Young Lee) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.5
터빈 블레이드의 엣지 형상 변화에 따른 표면 가스온도 발달과정에 대해서 전산해석을 수행하였다. Sharp형과 Round형의 터빈 블레이드를 모델링하였으며, 터빈의 회전수는 두 가지 형상 모두 0 ~ 10,000 rpm의 회전 속도를 주어 전산해석을 실시하였다. 터빈의 회전수가 증가할수록 터빈 블레이드 표면의 평균 온도는 하강하였고, Sharp형 엣지 형상이 Round형 엣지 형상에 비해서 터빈 블레이드의 표면 온도 분포가 전반적으로 낮은 분포를 나타내었다. The numerical analysis for gas temperature of turbine blade surface has been performed to investigate development of temperature with various blade edge shape. Two different types of the turbine which one is "Sharp" edge and the other is "Round" edge was modeled. Computations have been carried out several turbine rotational speeds in the range from 0 to 10,000 rpm for the each types of turbine edge shape. As a result, the more rotational speed of turbine increased, the more turbine blade"s temperature decreased. It is also found that the surface temperature of turbine blades for sharp type edge were lower than the round type edge.
몰로키아(Corchorus olitirius L.) 추출물의 생리활성에 대한 연구
유단희(Dan-Hee Yoo),이인철(In-Chul Lee) 한국인체미용예술학회 2021 한국인체미용예술학회지 Vol.22 No.2
In this study, the effects of the physiological activity of the Corchorus olitirius L. were verified and the applicability as a cosmetic material was reviewed. The total polyphenol content was expressed as 396.44±0.42 mg/100g dry in the water extract of Corchorus olitirius L. (COWE) and the content was expressed as 458.13±0.42 mg/100g dry in the 70% ethanol extract of Corchorus olitirius L. (COEE). The antioxidant effects were measured through an experiment evaluating the electron-donating ability and ABTS radical scavenging activities. In order to verify the whitening effects, tyrosinase inhibitory activity was measured and results showed an effect of 11.82% (COWE) and 48.21% (COEE) at 1,000 μg/mL, respectively. An MTT assay was conducted in RAW 264.7 and B16F10 cells to assess the cell survival rate; it was found that no toxicity was apparent at 100 μg/mL. Active suppression of nitric oxide (NO), an inflammation inducer, was measured to verify the anti-inflammatory efficacy. In the NO assay, experiments were conducted using a concentration of 100 μg/mL which led to a 95% survival rate. The NO assay was measured using Griess reagent and compared to the lipopolysaccharide treatment group and non-treatment group. The inhibition of cellular melanin synthesis was measured to determine the whitening effects. At 100 μg/mL, the inhibition activities of COWE and COEE were 15.69% and 22.67%, respectively. It has been confirmed that COWE and COEE are effective antioxidants, have whitening effects, and are anti-inflammatory agents. In particular, the use of COWE and COEE as natural materials for cosmetics was confirmed to have excellent effects.
무선 센서 네트워크에서 SVM 알고리즘을 이용한 클러스터 헤드 결정기법
이인철(In-Chul Lee),장형준(Hyeong-Jun Chang),심일주(Il-Joo Shim),장경배(Kyung-Bae Chang),박귀태(Gwi-Tae Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
제한된 전력의 노드들로 구성된 무선 센서 네트워크에서 효율적인 정보 수집이 이루어지기 위해서는 전체 네트워크의 Life Time을 늘리는 게 중요하다. 각각의 센서 노드들이 멀리 떨어져 있는 BS(Base Station)으로 직접 데이터를 전송하면 전력소비가 매우 크고 비효율 적이다. 그리하여 네트워크의 life time을 늘리기 위한 많은 연구가 이루어지고 있다. 그중에 클러스터링 기법은 가장 널리 연구되는 기법 중에 하나이다. 대표적인 클러스터링 기법 LEACH(Low-Energy Adaptive Clustering Hierarchy)[1]는 전체 노드 수의 5%를 클러스터 헤드로 결정하여 나머지 노드들로부터 데이터를 수집하여 BS로 전송함으로써 에너지를 효율적으로 사용하는 알고리즘이다. 그러나 클러스터 헤드를 결정하는데 있어서 잔여 에너지를 고려하지 않고 순환적으로 결정하는 문제점을 가지고 있다. 그래서 본 논문에서는 SVM(Supprt Vector Machine)을 이용하여 FND(First Node Die)가 발생했을 때 각 노드들의 에너지 잔량 정도를 따져서 영역을 나눈 후, 에너지가 더 많은 영역에서 클러스터 헤드를 선정하는 방법을 제안한다. 잔량 에너지가 많은 노드를 클러스터 헤드로 결정함으로써 전체 네트워크의 life time을 늘릴 수 있다.
3형제에서 발현된 Caroli병을 동반한 선천성 간 섬유화증 3예
이인철 ( In Chul Lee ),이영상 ( Young Sang Lee ),김명환 ( Myung Hwan Kim ),유은실 ( Eun Sil Yu ),민영일 ( Young Il Min ),류진숙 ( Jin Sook Ryu ),김해련 ( Hae Ryun Kim ),정영화 ( Young Hwa Joung ) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.2
We have experienced 3 cases of congenital hepatic fibrosis with Caroli's disease in 3 siblings, whose clinical manifestations were diverse such as repeated cholangitis or variceal hemorrhage. They also had multiple renal cysts, so we suppose that the clinical entities of these patients are in the spectrum of fibropolycystic disease of liver and kidney.
이인철(In-Chul Lee),김미경(Mee-Kyung Kim) 한국인체미용예술학회 2015 한국인체미용예술학회지 Vol.16 No.4
The stability of Onchungeum ethanol extract was investigated to determine its applicability as a functional cosmetic material. For its industrial application, the cosmetics were prepared with a water/oil/water(W/O/W) multiple emulsion. The results of the stability test showed that the W/O/W multiple emulsion containing ethanol extract of Onchungeum was highly stable for 60 days without change in particle stability, pH, viscosity, temperature and exposure to artificial lighting. These results suggest that an ethanol extract of Onchungeum can be a useful functional cosmetics material for improving skin diseases.