• Elastomers and Composites
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• 제56권3호
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• pp.117-123
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• 2021

Electronic skin (or E-skin) is an artificial smart skin composed of one or more than two sensors. E-skins detect external stimuli and convert them into electrical signals. Various types of E-skin sensors exist, including mechanical, physical, and chemical, depending on the detection signals involved. For wearable E-skins with superior sensitivity and reliability, developing conductors that possess both good elasticity and sensitivity is essential. Typical electrical conductors used in these sensors show very high sensitivity, but they have drawbacks such as non-linearity, irreversibility, and a narrow sensing range. To address these issues, stretchable and lightweight ionic conductors have been actively used in E-skin applications. This study summarizes the recent progress on various types of ionic conductors and ionic-conductor-based E-skin sensors.

• 융합정보논문지
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• 제11권3호
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• pp.220-228
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• 2021

본 연구에서는 2020년 10월12일부터 2020년 11월15까지 35~55세의 중년여성 20여명을 대상으로 연구하였다. 실험군에는 진여수클린미스트를 사용하도록 하였고, 대조군 10명의 여성들에게는 평소 사용하는 이온수 성분을 함유하지 않은 미스트제품을 사용하도록 설계하였다. 실험에 사용된 Janus 안면진단기(주. 피에스아이)로 피부에 조사하여 광원의 차이에 따라 관찰 되는 모공, 주름, 탄력, UV색소침착, 색소침착, 피부톤을 측정하였다. 실험전 클렌징을 하고 10분간 안정한 뒤 안면진단기로 촬영을 하였고, 진여수클린미스트 사용 후 7일에 1회씩 총 4회 촬영이 진행되었다. 통계처리는 SPSS 통계프로그램 21.0을 활용하여 실험에 참여한 두 집단 간 실험 전 데이터와 실험 후 데이터의 평균을 비교하기 위해 대응표본 t-test를 사용하였다. 야누스III의 데이터 분석자료에서 분석수치는 평균연령의 데이터를 기본값으로 하였으며 0(zoro)에서 숫자가 증가할수록 나이에 비해 개선이 요구된다. 분석결과, 진여수이클린미스트 제품을 사용한 집단에서 모공(t=3.280, p<.01), 주름((t=4.353, p<.01), 탄력(t=3.003, p<.05), 피부톤(t=3.280, p<.01)에서 통계적 유의수준 하에서 차이가 있는 것으로 나타났다. 반면 색소침착과 UV색소침착과 피부톤은 통계적으로 유의하지 않은 것으로 분석되었다.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2003년도 춘계학술발표대회 논문집
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• pp.135-138
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• 2003

Skin, the complex membrane that holds the body together, also embraces the full spectrum of design today-from product to architecture, fashion, and media. Every object has a skin. thick or thin, smooth or rough, porous or impermeable, the skin is the line between a hidden interior and an exterior we experience. Skin： Surface, Substance and Design is a compendium of products, furniture, fashion, architecture and media that expand the limits of what we understand as surface. Reflecting the convergence of natural and artificial life, this provocative a thesis shows how enhanced and simulated skins appear everywhere in today's world.

• 한국해양바이오학회지
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• 제9권2호
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• pp.58-64
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• 2017

Polysaccharides are useful materials for keep skin moisturizing and skin improvement cosmetic materials. We have isolated polysaccharides form Gracilariopsis sp. The polysaccharide derived from Gracilariopsis sp. have various size of 300kDa, 500kDa and over 1,000kDa. The volunteers applied a cream formula with polysaccharides from Graciariopsis sp. for 4 weeks. We found significant improvement of wrinkles and skin texture. We also found an effect of improving skin elasticity. When the moisture reduction rate of the skin was 2.8% lower than the 5.1% of hyaluronic acid. The polysaccharide extract from Gracilariopsis sp. showed stable pH and viscosity. The polysaccharides derived from Gracilariopsis sp. could be used as a cosmetic material.

• 한국가구학회지
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• 제25권2호
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• pp.87-95
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• 2014

Since 1990s the concern on essence and inside has transferred onto the surface and its style. The longing for plastic surgery and skin beauty might prove this fervent tendency. Furthermore the development of digital media and technology as well as high-tech material enabled this hope to be real in the realm of design. All these progresses and transitions toward the surface introduced more creative and novel phenomena of furniture design arena around its surface. The rising of surface has evolved through architecture, interior design and furniture. The surface of furniture can be easily transposed into the human skin. And it acquires the aspects of skin's metaphoric and symbolic meaning. The characteristics of skin effect in furniture design can be summarized as material aspects, relational aspects, and formal aspects. Material aspects shows skin's elasticity and smooth plane. Relational aspects express the reactive functions of skin. Formal aspects represent organic power through surface.

• Archives of Plastic Surgery
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• 제40권4호
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• pp.403-408
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• 2013

Background For patients with neuropathy, vasculopathy, and impairment of wound healing, treatment of a diabetic foot ulcer poses many challenges. A large number of dermal analogues have been invented in an effort to overcome these challenges. Matriderm, a dermal analogue, is made from bovine collagen and elastin. This study was conducted in order to evaluate the effectiveness of Matriderm for treatment of diabetic foot ulcers, in comparison with skin grafting. Methods Sixty patients with diabetic foot ulcer were included in this prospective study. The average age of the patients, who had type II diabetes mellitus, was 58 years old. The patients were allocated to an experimental or control group with their consents. The patients were selected with their consent for inclusion in an experimental group and a control group. Patients in the experimental group received a Matriderm appliance and a split-thickness skin graft, while those in the control group received only a split-thickness skin graft. Results A shorter hospitalization period (7.52 weeks) was observed in the experimental group than in the control group (9.22 weeks), and a shorter period of time (8.61 weeks) was required for complete healing, compared with the control group (12.94 weeks), with statistical significance (P<0.05). A higher elasticity ratio of the affected side to the non-affected side was observed in the experimental group, compared with the control group (P<0.01). Conclusions Matriderm enables effective healing and improves elasticity in treatment of patients with diabetic foot ulcer.

• Journal of Ginseng Research
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• 제44권5호
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• pp.738-746
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• 2020

Background: Red ginseng contains components, including microelements, vitamins, essential oils, and fatty acids, that can be used in skincare to delay the aging process. We investigated the effects of red ginseng treatment on skin elasticity by assessing cellular stiffness and measuring collagen protein synthesis. Methods: Human dermal fibroblasts were treated with red ginseng, and the resulting changes in stiffness were investigated using atomic force microscopy. Cytoskeletal changes and mRNA expression of biomarkers of aging, including that of procollagens I and VII, elastin, and fibrillin-1, were investigated. Collagen in a human skin equivalent treated with red ginseng was visualized via hematoxylin and eosin staining, scanning electron microscopy, and atomic force microscopy. Results and conclusion: The stiffness of fibroblasts was significantly reduced by treatment with red ginseng concentrations of ≥ 0.8 mg/mL. The ratio of F-actin to G-actin decreased after treatment, which corresponded to a change in fibroblast stiffness. The storage modulus (G') and loss modulus (G'') of the skin equivalent were both lowered by red ginseng treatment. This result indicates that the viscoelasticity of the skin equivalent can be restored by red ginseng treatment.

• 한국산학기술학회논문지
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• 제15권4호
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• pp.2303-2309
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• 2014

본 연구는 자동미세다륜침 적용한 한 뒤 EGF를 50대여성의 노화피부에 공급하여 수분과 탄력의 증가, 색소와 눈가주름의 감소에 효과를 알아보는데 목적이 있다. 본 연구는 50대여성 35명을 대상으로 2013년 10월 7일부터 2013년 12월 15일까지 총 70일간 이루어졌다. 연구결과 자동미세다륜침의 사용만으로 수분(<.01), 탄력(<.001)이 좋아졌으며, 색소(<.01)와 주름(<.001)이 감소하였다. 또한 활성성분인 EGF를 적용하였을 때 자동미세다륜침만 사용하였을 때 보다 좋은 결과를 나타냈다. 이에 재생을 촉진하는 EGF 등의 활성성분을 함께 사용한다면 긍정적인 효과를 더욱 증대시킬 것으로 사료된다.

• Archives of Plastic Surgery
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• 제46권5호
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• pp.433-440
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• 2019

Background Mastectomy in male transgender patients is an important (and often the first) step toward physical manhood. At our department, mastectomies in transgender patients have been performed for several decades. Methods Recorded data were collected and analyzed for all male transgender patients undergoing mastectomy over a period of 24 years at our department. Results In total, 268 gender-reassigning mastectomies were performed. Several different mastectomy techniques (areolar incision, n=172; sub-mammary incision, n=96) were used according to patients' habitus and breast features. Corresponding to algorithms presented in the current literature, certain breast qualities were matched with a particular mastectomy technique. Overall, small breasts with marginal ptosis and good skin elasticity allowed small areolar incisions as a method of access for glandular removal. In contrast, large breasts and those with heavy ptosis or poor skin elasticity often required larger incisions for breast amputation. The secondary correction rate (38%) was high for gender reassignment mastectomy, as is also reflected by data in the current literature. Secondary correction frequently involved revision of chest wall recontouring, suggesting inadequate removal of the mammary tissue, as well as scar revision, which may reflect intense traction during wound healing (36%). Secondary corrections were performed more often after using small areolar incision techniques (48%) than after using large sub-mammary incisions (21%). Conclusions Choosing the suitable mastectomy technique for each patient requires careful individual evaluation of breast features such as size, degree of ptosis, and skin elasticity in order to maximize patient satisfaction and minimize secondary revisions.

• 대한화장품학회지
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• 제43권4호
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• pp.297-307
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• 2017

피부 특성은 다양한 내부 또는 외부 요인의 영향을 받는다. 이 연구는 아시아 여성들의 피부 특성을 조사 및 비교하기 위해 수행되었다. 우리는 7개국(말레이시아, 인도네시아, 베트남, 태국, 인도, 중국 및 한국)에서 1,500명의 아시아인의 피부 물리적 변수 및 지역 간 차이를 평가하였다. 경피 수분 손실, pH, 피부 수분, 피지함량, 피부 민감도, 탄력, 눈가 주름 및 피부 밝기의 값을 측정하였다. 인도 여성들은 다른 국가들의 여성들보다 피부 수분량, 피지량 및 민감도 점수가 낮게 나타났고, 더 어두운 피부색을 갖는 것으로 조사되었다. 또한, 모든 부위의 피부 표면 pH는 7개국 중 가장 높게 나타났다. 베트남인은 가장 낮은 수치의 피부 표면 pH 값을 보였다. 한국인과 중국인은 일반적으로 탄력성이 높고 적은 눈가 주름을 가진 것으로 나타났다. 피부 수분과 경피 수분손실량은 민감도와 양의 상관 관계가 있었으며, 주름과 민감도 간에는 음의 상관 관계가 있었다. 본 연구 결과는 해당 지역이나 지역과 관련된 명확한 추세는 없었다. 피부 물리적 매개 변수는 지역적 차이에 대한 이해와 함께 다양한 요인(피부 관리 습관, 라이프스타일 및 개인 민감도)에 대한 연구도 함께 진행되어야 할 것이다.