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피부 투명감 측정 기기의 소형화 및 피부의 확산 반사광과 투명감 사이의 연구
이명렬 ( Myeong Ryeol Lee ),정춘복 ( Choon Bok Jeong ),정유철 ( Junng Yu Chul ),김한곤 ( Han-kon Kim ),남개원 ( Gae Won Nam ) 대한화장품학회 2011 대한화장품학회지 Vol.37 No.2
미백과 더불어 피부 칙칙함은 많은 여성들의 고민거리다. 칙칙함이란 피부의 붉은 기와 광택이 감소하고, 노란기는 증가하며 피부의 명도가 저하되어 보이는 상태를 말하며, 최근까지 피부 칙칙함의 경우, 일반적으로 피부색 측정을 통해 명도, 색 불균일성 등으로 많이 평가하였다. 명도는 L* a* b* 표색계(CIELAB color space system)의 L*로 나타낸다. 하지만 L*값은 칙칙함 중 하나의 현상, 명도를 측정한 지표일 뿐만 아니라 칙칙함(투명감)같은 인지효능과의 연계점을 찾기 힘든 단점이 있다. 이에 투명감이 높은 피부(칙칙하지 않은 피부)는 동일한 광세기가 피부로 입사하였을 때 피부 내부로부터 빛이 많이 돌아오는 피부이고 이는 확산 반사광(내부 반사광)이 큰 피부라는 피부 투명감 측정 방법에 따라 편광기술을 이용한 자사 제작의 이전 투명감 측정 기기와 측정의 용이성과 휴대성을 개선한 Lumiscan<sup>TM</sup>이라 명명한 신규기기를 개발, 기존 투명감 측정기기와 신규기기로 20 ~ 30대 남성과 여성의 얼굴 피부 투명도를 측정하여 육안을 통한 투명감과 확산반사광 값의 관계를 통해 신규기기의 성능을 확인하고자 하였다. 이번 연구에서 육안 평가와 신규기기의 확산 반사광 값 사이에 단순 비교가 아닌 강한 상관성(R = 0.732, p < 0.01)이 있음을 확인할 수 있었으며 이전 자사개발 기기가 지닌 낮은 휴대성과 측정의 불편함을 개선한 Lumiscan<sup>TM</sup>의 성능평가를 확인할 수 있었다. Skin darkness is the source of trouble to many women. Skin darkness is the state that while skin redness and brightness are reduced, skin yellowness is increased. Skin translucency which is measured by skin color, especially brightness is an another expression of skin darkness. Skin brightness is usually expressed by L value of L* a* b* (CIELAB color space system). However, it is hard to find the relationship between L value and perceptive efficacy such as translucency because the L value is just a factor of evaluation of skin darkness. The skin with high translucency has high scattering reflective light value than low value. In this study, we measured the skin translucency of 20 ~ 30 ages men and women face by both our designed previous device which use polarized light to detect surface and scatter reflective light independently and Lumiscan<sup>TM</sup> which is improved designed to confirm our new device working ability by calculation of relationship between trnaslucency and scattering reflective light value. The result of this study indicate that there is a high correlation (R = 0.732, p < 0.01) between translucency and scattering reflective light value, and suggest that Lumiscan<sup>TM</sup> is portable and easy measuring device more that previous device.
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( Nam Gyoung Ha ),( Seon Hwa Lee ),( Eun Hye Lee ),( Dae-lyong Ha ),( Kyung Duck Park ),( Yong Hyun Jang ),( Weon Ju Lee ),( Seok-jong Lee ),( Jun Young Kim ) 대한피부과학회 2021 대한피부과학회 학술발표대회집 Vol.72 No.2
Skin color change to dark reddish brown (DRB) of whole body in ordinary Koreans is rare and often occurred by severe liver disease, side effects of medications, etc. However, DRB skin by an infection is not common. A newborn with early congenital syphilis (ECS) and cytomegalovirus infection was referred to dermatology. He was premature infant delivered at gestational age 27 weeks with a birth weight of 840 g. Although his parents were Koreans, he showed generalized DRB skin (Fitzpatrick’s skin phototype VI) and multiple edematous vesiculobullous lesions with desquamation and serous discharge on body folds and weight-bearing area. He presented distended abdomen and, hyperbilirubinemia, hepatomegaly, thrombocytopenia and renal failure were also observed on the examination. Despite of intensive treatment with ampicillin, meropenem and ganciclovir, he eventually expired 24 days after birth. Although ECS is one of well-known congenital infections, nowadays dermatologists have a rare chance to experience ECS in practice. Cutaneous feature of ECS is typically a copper-red maculopapular skin eruption on palms and soles. However, he showed generalized DRB skin and hyperbilirubinemia, hepatomegaly, thrombocytopenia which imply severe hepatic dysfunction. Based on these findings, the DRB skin is thought to be caused by severe jaundice. We report a fatal case of ECS presenting with multiple vesiculobullous eruption and generalized DRB skin.
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김민정 ( Min Jung Kim ),김정희 ( Jeong Hee Kim ) 한국미용학회 2013 한국미용학회지 Vol.19 No.5
In this study, we examined the coloration effects of concealer depending on the individual`s skin color and Dark-circle. In 90 women, we measured their forehead, cheek and dark circle sites using spectrophoto-meter(Minolta CM-700d). After applying 4 difference color of concealers on the Dark circle sites, we measured colorimetric values with CIE color system and analyzed by statistical methods. There sults of the above showed that Dark circle sites have a little more dark color than the sites of cheeks and forehead. For the change value(△E) after applying concealer, concealer1 and 2 in the Bright tone skin was the most suitable concealer. In the Mid-tone skin, concealer2 was the most suitable one due to its smaller change value compared to other concealers. In the Dark-tone skin, concealer 3 was the most suitable one. When each of concealer was applied, there was a similar result between when viewed as the result of the experiment and when viewed with the visual inspection.
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