• 한국산학기술학회논문지
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• 제11권11호
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• pp.4455-4459
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• 2010

호호바오일 마사지가 건조피부에 미치는 효과를 알아보고자, 건조피부로 평가된 10명을 대상으로, 한쪽 팔에는 호호바오일 마사지를, 다른 쪽 팔에 아무것도 적용하지 않았다. 호호바오일 마사지 그룹은 호호바오일을 이용, 10분간의 팔 마사지를 주 2회로 총 8회 실시하였다. 실험 결과 호호바오일 마사지를 한 그룹은 유분과 수분의 함유량이 증가하였다. 특히, 마사지의 횟수가 증가 될수록 피부에서의 유 수분은 증가하는 것을 알 수 있었다(유분 : t=-7.470, p<0.001(팔안쪽)/t=-4.666, p<0.01(팔바깥쪽), 수분 :t=-3.966, p<0.01(팔안쪽)/t=-6.847, p<0.001(팔바깥쪽). 따라서 호호바오일 마사지는 건조피부를 개선시키는 효과가 있는 것으로 확인되었다.

• 한국산학기술학회논문지
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• 제15권1호
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• pp.581-584
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• 2014

피부란 인체의 외부표면을 덮고 있는 조직으로서 물리적 화학적으로 외부로부터 신체를 보호하는 동시에 전신의 대사에 필요한 생화학적 기능을 수행하는, 생명유지에 없어서는 안 되는 기관이다. 피부의 해부학적인 구조와 생리학적인 기능은 부위, 성별, 연령, 인종 및 영양 상태 등에 따라 많은 차이를 보인다. 본 연구에서는 한국의 20대와 한국 거주하는 중국의 20대 피부의 보습능을 측정하였다. 수분량의 경우 중국인이 한국인보다 유의미하게 높은 것으로 나타났고, 피부수분증발량 또한 중국인이 한국인보다 낮게 나타났다. 측정결과 20대 한국인과 중국인에 대하여 동일한 주거환경 하에서의 피부 보습능을 측정한 결과, 중국인이 좋은 것으로 나타났다.

• International Journal of Naval Architecture and Ocean Engineering
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• 제6권1호
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• pp.151-161
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• 2014

In this study, an experimental investigation has been made of the applicability of outer-layer vertical blades to real ship model. After first devised by Hutchins and Choi (2003), the outer-layer vertical blades demonstrated its effectiveness in reducing total drag of flat plate (Park et al., 2011) with maximum drag reduction of 9.6%. With a view to assessing the effect in the flow around a ship, the arrays of outer-layer vertical blades have been installed onto the side bottom and flat bottom of a 300k KVLCC model. A series of towing tank test has been carried out to investigate resistance (CTM) reduction efficiency and improvement of stern wake distribution with varying geometric parameters of the blades array. The installation of vertical blades led to the CTM reduction of 2.15~2.76% near the service speed. The nominal wake fraction was affected marginally by the blades array and the axial velocity distribution tended to be more uniform by the blades array.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 2003년도 추계 학술발표회 논문집
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• pp.153-158
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• 2003

This study concerns the characteristics of helical flow in a concentric annulus with a diameter ratio of 0.52 and 0.9, whose outer cylinders are stationary and inner ones are rotating. Pressure losses and skin friction coefficients have been measured for fully developed flows of water and 0.2％ aqueous of sodium carboxymethyl cellulose(CMC), respectively, when the inner cylinder rotates at the speed of 0∼500rpm. The effect of rotation on the skin friction is significantly dependent on the flow regime. In all flow regimes, the skin friction coefficient is increased by the inner cylinder rotation. The change of skin friction coefficient corresponding to the variation of rotating speed is large for the laminar flow regime, whereas it becomes smaller as Re increases for the transitional flow regime and, then, it gradually approach to zero for the turbulent flow regime.

• Steel and Composite Structures
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• 제22권5호
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• pp.1141-1162
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• 2016

Concrete-filled double skin steel tube (CFDST) beam-columns are widely used in industrial plants, subways, high-rise buildings and arch bridges. The CFDST columns have the same advantages as traditional CFT members. Moreover, they have lighter weight, higher bending stiffness, better cyclic performance, and have higher fire resistance capacities than their CFT counterparts. The scope of this study is to develop finite element models that can predict accepted capacities of double skin concrete-filled tube columns under the combined effect of axial and bending actions. The analysis results were studied to determine the distribution of stresses among the different components and the effect of the concrete core on the outer and inner steel tube. The developed models are first verified against the available experimental data. Accordingly, an extensive parametric study was performed considering different key factors including load eccentricity, slenderness ratio, concrete compressive strength, and steel tube yield strength. The results of the performed parametric study are intended to supplement the experimental research and examine the accuracy of the available design formulas.

• 설비공학논문집
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• 제14권10호
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• pp.833-843
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• 2002

The present experimental and numerical investigations are performed for the characteristics of transitional flow in a concentric annulus with a diameter ratio of 0.52, whose outer cylinder is stationary and inner one rotating. The pressure losses and skin- friction coefficients have been measured for the fully developed flow of water and glycerine-water solution (44%) with the inner cylinder rotating at speed of 0∼600 nm, respectively. The transitional flow has been examined by the measurement of pressure losses to reveal the relation of the Reynolds and Rossby numbers with the skin-friction coefficients. The occurrence of transition has been checked by the gradient changes of pressure losses and skin-friction coefficients with respect to the Reynolds numbers. The increasing rate of skin-friction coefficient due to the rotation is uniform for laminar flow regime, whereas it is suddenly reduced for transitional flow regime and, then, it is gradually declined for turbulent flow regime.

• KIEAE Journal
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• 제8권1호
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• pp.11-18
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• 2008

The purpose of this study is to analyze application methods and structural characteristics of each element of environment-friendly European housing through classification of skin types. The results of the study are following. 1) The skins are classified by three types; single skin with multi layers, double skin with single layer and double skin with multi layers. 2) Most single skins with multi-layer are composed with wooden louvers, sun blinds and insulating windows. There are introduction of atrium and balcony, and variation sectional space composition according to cases. 3) There are two types of double skins; to put cavity between inner skin and outer skin and more extensional spaces such as balconies, corridors and stair halls. Solar walls and mechanical ventilators are often introduced to double skins with multi-layer. 4) The functions of the latest environment-friendly skins are vary from controllers and buffers of indoor environmental elements such as temperature, light, air and sound to equipments to perform essential functions to efficiently operate HVAC systems.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집B
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• pp.631-636
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• 2000

The experimental study concerns the characteristics of a transitional flow in a concentric annulus with a diameter ration of 0.52, whose outer cylinder is stationary and inner one rotating. The pressure drops and skin-friction coefficients have been measured for the fully developed flow of water and that of glycerine-water solution (44%) at a inner cylinder rotational speed of $0{\sim}600$ rpm, respectively. The transitional flow have been examined by the measurement of pressure drops and the visualization of flow field, to reveal the relation of the Reynolds and Rossby numbers with the skin-friction coefficients and to understand the flow instability mechanism. The present results show that the skin-friction coefficients have the significant relation with the Rossby numbers, only for laminar regime. The occurrence of transition has been checked by the gradient changes of pressure drops and skin-friction coefficients with respect to the Reynolds numbers. The increasing rate of skin-friction coefficient due to the rotation is uniform for laminar flow regime, whereas it is suddenly reduced for transitional flow regime and, then, is gradually declined for turbulent flow regime. Consequently, the critical (axial-flow) Reynolds number decreases as the rotational speed increases. Thus, the rotation of inner cylinder promotes the early occurrence of transition due to the excitation of taylor vortices.

• 한국유기농업학회지
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• 제23권1호
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• pp.91-101
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• 2015

'추황배' 배 과수원에 봉지종류와 수확시기를 달리하였을 때 수상의 과피흑변과 발생과 수확 후 과실품질에 어떠한 영향을 미치는 지를 규명하기 위하여 수행되었다. 본 시험은 두 가지로, 첫 번째는 네 종류의 봉지(신문지외지/황색내지, 회색외지/황색내지, 신문지외지/흑색내지, 신문지외지/적색내지) 시험이었고, 두 번째 시험은 만개 후 160일, 170일, 180일, 190일, 200일에 수확하였을 때 과피흑변과와 과실품질을 조사하였다. 신문지외지/황색내지의 봉지가 투광도와 투기도 및 수분투과도인 물리성이 향상되었고, 신문지외지/적색내지가 봉지물리성이 낮은 경향을 보였다. 신문지외지/황색내지는 수상에서의 과피흑변과 발생이 나타나지 않았고, 신문지외지/적색내지를 괘대처리 한 과실에서는 약 12.7%의 과피흑변과가 관찰되었다. 과피흑변은 주로 과실의 중앙부와 과정부에서 집중적으로 발생되었다. 신문지외지/적색내지를 이용한 유대재배는 평균과중, 경도, 산도, 그리고 착색이 향상되는 경향을 보였다. 수확시기가 늦어질수록(만개 후 190일과 200일에 수확) 과피흑변, 평균과중, 당도가 증가되었고 반대로 과실경도와 산도는 감소되었다.

• 한국생활과학회지
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• 제17권1호
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• pp.105-114
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• 2008

This study aims on observing the social recognition and its aspects for men taking care of their outer appearances at current point where men are rapidly rising as the main consumer in the beauty industry while their interest for outer appearances are increasing. Therefore, we observed the overall trend and changes in social recognition for male looks by analyzing the contents of articles in fashion magazines that play the critical role of spreading the trend while suggesting and delivering the diverse trend changes to the public to correspond to the individual and concrete demands of certain class segmented into gender, age, hobby, and more. As a result, articles related to outer appearances were divided into fashion, cosmetic and skin, hair and scalp, body figure care, cosmetic surgery, and others, and among them, fashion category took up the highest ratio. Also, articles related to outer appearances increased even more according to the change in time, where articles related to fashion and hair increased while articles of other categories decreased.