• Journal of the Society of Cosmetic Scientists of Korea
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• 제44권4호
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• pp.455-463
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• 2018

Skin elasticity has been known to be influenced by the change of dermal components such as collagen, elastic fiber, and glycosaminoglycans. However, it is unclear whether the uppermost epidermis may affect the mechanical characteristics of elasticity. In present study we tried to find the role of stratum corneum when determining the elastic property under skin bioengineering measurement with $Cutometer^{(R)}$. A total of 10 healthy volunteers aged 25-40 years were investigated by the parameters reflecting the skin elasticity from face and volar forearm. Within various ranges of suction pressure, R0 (=Uf), R7 (=Ur/Uf) and R8 (=Ua) were obtained to explore the depth-associated elasticity. In addition, these parameters were re-measured after the skin was fully hydrated. As results, we found that the measurement of depth-associated elasticity was possible as using various suction pressure. And the R7 parameter was significantly lower from face than those from forearm in before hydration (p < 0.05). Also, we found that the hydration of stratum corneum could affect skin elasticity. Especially, the R7 parameter at 300 mbar suction pressure of face skin showed significantly increased values than that of before hydration (p < 0.05). Interestingly, measured data from the face before and after hydration manifested relatively higher variation than from the forearm. These results suggest that it is possible to evaluate the skin elasticity considering the changes of stratum corneum and epidermis by using various suction pressure and skin hydration.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 한국어업기술학회 2000년도 춘계수산관련학회 공동학술대회발표요지집
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• pp.389-390
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• 2000

어류의 피부계는 크게 상피층과 진피층으로 구성되고, 상피층을 구성하는 세포들의 종류와 발달정도는 종, 연령, 생활환경 그리고 이들의 생리적 상태에 따라 매우 다양하게 변화한다 (Henrikson and Natoltsy, 1968; Burton and Everard, 1991; Eastman and Hikida, 1991; Hertwig et al., 1992: Park et al., 1995; Lee and Kim, 1999). 본 연구는 저서 정착성 어류인 문치가자미의 피부 상피층 구성 세포들의 미세구조를 기재함으로서 추후 이들 어류의 생활환경 및 생리적 변화에 따른 피부계의 변화 양상에 관한 연구의 기초자료를 제공하고자 하였다. (중략)

• Proceedings of the Korean Society of Computer Information Conference
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• 한국컴퓨터정보학회 2012년도 제45차 동계학술발표논문집 20권1호
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• pp.73-75
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• 2012

본 논문에서는 복부 초음파 영상에서 근육 영역의 명암 대비를 강조하기 위해서 Multiple 연산을 적용한 후, 명암 대비가 강조된 영상에서 수직 방향의 명암도가 200 이상인 픽셀들에 대해 퍼지 기법에 적용하여 이진화한다. 이진화된 영상에서 피부층과 외복사근 사이에 존재하는 피하지방을 추출하기 위해 Thick-Search 방법을 적용하여 피부층과 외복사근을 추출한 후, 피부층과 외복사근의 사이에 Up-Down Search 방법을 적용하여 피하지방층을 추출한다. 피하지방층이 추출된 영상에서 근막의 형태학적 정보를 이용하여 근막을 추출한다. 추출된 근막 사이에 대해 Up-Down Search 방법을 적용하여 근육의 후보 영역을 추출한 후, 근육의 형태학적 정보를 이용하여 최종적인 근육 층을 추출한다. 추출된 근육의 경계선을 Monotone Cubic Hermite 보간법을 이용하여 근육의 경계선을 보정한 후, 최소자승법을 이용하여 근육의 두께를 측정한다. 제안된 방법을 복부 초음파 영상에 적용하여 근막 및 근육 영역을 추출한 결과, 기존의 근육 추출 방법보다 정확하게 추출되었고, 근육의 두께 측정 결과도 전문의가 육안으로 측정한 결과와 근사한 것을 확인할 수 있었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.531-533
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• 2017

본 논문에서는 퍼지 영상처리 기법을 이용하여 손뼈의 X-Ray 영상에서 손뼈의 윤곽선을 추출하는 방법을 제안한다. 제안된 방법에서는 전 처리 단계로써 감마 상관관계를 이용하여 X-Ray 영상에서 손뼈를 제외한 피부층을 제거한다. 피부층이 제거된 영상에서 손뼈를 뚜렷하게 만들기 위해 샤프닝 기법을 사용한다. 샤프닝 기법이 적용된 영상에서 손뼈의 명암대비를 선명하게 하기 위해 사다리꼴 형태의 Fuzzy Stretching 기법을 적용한다. 사다리꼴 형태의 Fuzzy Stretching 기법을 적용한 영상에서 Canny Edge 기법을 적용하여 손뼈의 윤곽선을 추출한다. 제안된 추출 방법을 20개의 실험 영상을 대상으로 실험한 결과, 16개의 실험 영상에서는 손뼈의 윤곽선이 정확히 추출되었고 4개의 실험 영상에서는 손뼈의 윤곽선이 손실된 상태로 추출되었다.

• Journal of the Society of Cosmetic Scientists of Korea
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• 제33권2호
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• pp.99-104
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• 2007

The skin barrier function is one of the vital functions. Horny layer and epidermis among various skin layers play an important role in protecting body from environmental insults. Stratum corneum is completely formed by differentiation processes from the basal layer and newly formed corneocytes push the older ones from skin surface. In this study we investigated changes of various parameters - capacitance, transepidermal water loss (TEWL), pH and amount of removed corneocytes - according to the stratum corneum's depth. We removed the stratum corneum using tape stripping technique. We found that uppermost stratum corneum play an important role in skin surface moisturization and lower stratum corneum in protecting transepidermal water loss. In addition, skin pH is more acidic than surface pH. In the stratum corneum, skin pH is mote acidic in the deeper layer. Furthermore amount of removed corneocyte is also decreased according to depth because of stronger cell-cell union strength. From these results we suggest that stratum corneum has different characteristics depending on their position.

• Korean Journal of Ichthyology
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• 제20권2호
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• pp.90-96
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• 2008

The histological morphology on the skin of Misgurnus anguillicaudatus was described in the three regions such as dorsal, lateral, occiput and subsequently morphological variations of the skin were monthly observed for a year. The skin consisted of epidermis having epithelial cell, club cell and mucus cell, and dermis of mainly connective tissue fiber, embedded scale and blood capillary. Unicellular mucus cells situated at the epidermis underwent seasonal change in its size, as well as number and amounts of mucus-secreting materials, which they greatly increased in winter, but did not in summer. As it is getting cold, the mucus cells' shape changed from initial spherical to oval or elongated form. Such considerable changes in the mucus cell were particularly most evident in the occiput during winter. Moreover, the dermis largely thickened about 2~3 times in winter than in summer. Based on these results, we discussed function for the mucus on what it mainly acts in nature and information on whether mucus cells' seasonal variations affect on hibernation and cutaneous respiration.

• Journal of the Society of Cosmetic Scientists of Korea
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• 제41권2호
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• pp.113-119
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• 2015

The measurement of hydration level in the surface layer of the skin, stratum corneum (SC), gives important information on the biophysical properties and function of the skin barrier such as softness, flexibility, and healthiness of the skin. But it is difficult to measure a consistent hydration level from a sample to another sample due to individual variations and environmental changes. The aim of this study was to evaluate objective hydration after using various products in the SC. The SC Hydration was measured by capacitance (Corneometer$^{(R)}$, C+K, Germany) on the ventral site of forearm from 40 healthy volunteers. The skin surface was chronologically measured immediately after application of the test products and 3 and 6 hours later. We analyzed the averages of five measurements of each site and used the hydration increase rate for correction on untreated site variation. We found that most polyols including glycerol and butylenes glycol influenced directly the hydration increase rate in the SC previously. In this study, glycerol was used to prepare the standard products from 0 to 20 percents and applied to the same volunteers. The individual standard curve showed linear relation to glycerol concentrations. Based on the the standard curve, hydration of SC was converted into hydration increase rate to glycerol concentrations. The converted glycerol concentrations of products were repetitive and reproducible. In addition, the individual standard curve was used to relate the skin type of each individual. These results suggest that the hydration of the SC standardized regardless of external variation and individual skin condition can explain detailed skin state variation. Further studies will be conducted with other ingredients such as surfactants, lipids and aqueous materials, and with other methods for noninvasive measurement.

• Journal of Food Hygiene and Safety
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• 제16권2호
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• pp.117-124
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• 2001

The main constituent of green tea, catechins have been reported to have numberous biological anti-vites including antimutagenic, antibacterial, hypocholesterolemic, antioxidant and antitumor properties. In the present study, we examined the protective effect of catechin on UVB-induced skin damage. Catechin (3 mg/mouse) was topically treated to dorsal area of SHK-1 hairless mouse daily for 2 weeks. UVB (100 mJ/$\textrm{cm}^2$) was also treated soon after application of catechin alone or with catechin for 2 weeks. Catechin reduced UVB-induced infiltration of inflammatory cells, fibrosis of cells and collagen-fiber formation. In addition, catechin also prevented UVB-induced DNA fragmentation and apoptosis cell number, but not changed p53 level. Furthermore catechin inhibited UVB-induced cell proliferation. There results showed that catechin have preventive effect aganinst UVB-induced skin damages. and these effects could contribute to the antitumor promoters activity.

• Journal of Veterinary Clinics
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• 제27권2호
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• pp.142-146
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• 2010

The purpose of this study is to establish experimental canine skin barrier disruption model in dog. The study was designed to investigate the predictive properties of acetone damage using as effect parameters transepidermal water loss (TEWL) and stratum corneum (SC) hydration. To compare the structures of SC intercellular lipids in normal and acetone damaged skin, TEM observations were performed. Six clinically normal, male Beagles without dermatological problems were chosen for this study. Acetone damage was performed at 48hrs after clipping. Efficacy measurements for TEWL and skin hydration were performed before ($t_1$) and after ($t_2$) damage in a temperature- and humidity-controlled room ($2{0\sim}22^{\circ}C$, 50-60%). TEWL and SC hydration values were decreased in the acetone damaged model compared with non damaged skin. In TEM observation of acetone damaged sample, the intercellular lipid lamellae exhibit abnormal and incomplete structure compared with those of normal skin. It seems that acetone damage would be one of canine skin epidermal barrier disruption model for the study of canine atopic dermatitis (AD) as well as dry skin in veterinary dermatology research.

• Journal of the Korean Society of Food Science and Nutrition
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• 제33권5호
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• pp.785-790
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• 2004

Kimchi is well known as a traditional Korean food containing various antioxidative compounds and it has been demonstrated that dietary kimchi inhibit the tissue oxidation and aging in many related studies. Ultraviolet B (UVB) radiation is the most potent among the many related factor to skin photo-aging. This experiment is designed to elucidate the inhibitory effect of solvent fractionation of various kimchi on UVB induced oxidation and erythema formation. Among solvent fractions, phenol content mostly existed in dichloromethane / ethylacetate fraction of buchu kimchi, dichloromethane fraction of Korean cabbage kimchi and ethylacetate / dichloromethane fraction of mustard leaf kimchi. Free radical scavenging activities were higher in dichloromethane and ethylacetate fraction from buchu kimchi, dichloromethane fraction from Korean cabbage kimchi, and ethylacetate fraction from mustard leaf kimchi. When the damage of photo-oxidation by UVB irradiation was tested in the presence of solvent fractions of kimchi, dichloromethane / ethylacetate fraction of buchu kimchi, ethylacetate fraction from Korean cabbage and from mustard leaf kimchi showed the higher protective activities than others. The erythema formations which were induced by UVB irradiation were decreased in solvent fractions of kimchi that hate higher antioxidant activities. In conclusion, kimchi solvent fractions having antioxidant compounds mostly inhibited photo-oxidation and erythema formation by UV-irradiation, therefore kimchi consumption can retard skin aging due to the presence of antioxidative compounds.