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제주도 자생 식물 혼합추출물의 in vitro 생리활성 평가
이인철 ( In-chul Lee ),박병권 ( Byoung-kwon Park ),김정미 ( Jeong-mi Kim ),문지영 ( Ji-young Moon ),김대용 ( Dae-yong Kim ) 대한미용학회(구 대한미용과학회) 2018 대한미용학회지 Vol.14 No.1
In this study moisturizing and anti-wrinkle effects of water extract from Jeju island plant mixture such as Portulaca oleracea, Opuntia ficusindica var. saboten, aloe vera, Ecklonia cava were investigated in vitro. Hyaluronic acid (HA) is a highly hydrophilic molecule known to be associated with skin moisture, wrinkle formation. Also, many studies have reported that collagen and elastin are a major factor in skin wrinkle formation. Therefore, we performed MTT assay, HA synthesis, hyaluronic acid synthase-2 (HAS-2) gene expression, collagen synthesis, hyaluronidase, collagenase and elastase inhibition assay for evaluation of biological activities. ELISA assay revealed that mixture increased HA and collagen production and RT-PCR also showed that mixture increased mRNA level of HAS-2 gene in HaCaT cells. And other results showed prevention of hyaluronidase, collagenase and elastase activation. These results indicate Jeju island plants mixture have moisturizing and anti-wrinkle effects. Therefore, Jeju island plants mixture can be used as a functional cosmetic.
미립화 및 분무장치 1 : 기체 공급 방식에 변화에 따른 2단 공기 보조식 분사기의 분무 분열 및 입도 분포 특성
이인철 ( In Chul Lee ),김도헌 ( Do Hun Kim ),구자예 ( Ja Ye Koo ) 한국액체미립화학회 2012 한국액체미립화학회 학술강연회 논문집 Vol.2012 No.-
Air-blast spray gun can produce homogeneous pattern of droplet distribution, so relatively fine film can be generated at the surfaces. In the spray painting and coating industries, air-blast injector configured with a liquid-centered and 2-stage gas outer nozzle have many advantages which are low paint bounce-back, high transfer efficiency. The experimental investigations are to study liquid column break-up and overspray characteristics. To verify the effect of gas jet, an air-blast injector with a gas post of 2-stages is designed to conduct overall spray characteristics as well as to increase transfer efficiency. Number of droplet distributions is measured by laser diffraction with Mie-scattering methods considering the ratio of refractive indices and absorption coefficient. The experiment results show that the main effect of liquid jet break-up is governed with gas jet of the inner-stage. In the case of inner gas injection, the exit at the inner stage transfer more shear force to center of liquid column. However, because the nozzle exit of outer stage is located to the far from liquid column, shear force to break-up liquid jet do not fully affect liquid column. For the outer-stage gas injection has less shear force to the liquid column than inner-stage gas injection. In case of inner stage gas jet, better atomization qualities can be achieved, however, in case of outer stage gas jet, larger droplet distributions are appeared on the same measurement area. As increase momentum ratio of gas jet, droplet sizes decreased. Additionally, gas jet of the outer-stage also contributes atomization at the far-field spray region and droplet transportation to the object. It was observed that, as the gas jets increase, droplet mean diameters decreased and transfer efficiency increased due to the outer gas post which makes an air-curtain around the spray jets so that impinged droplet cannot overspray to the outer region of the spray jets.
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.
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.