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다양한 기둥 타입을 가지는 나노 구조물 고체 표면에서의 물 액적 젖음 특성
유민정(Min Jung Yoo),권태우(Tae Woo Kwon),하만영(Man Yeong Ha) 대한기계학회 2016 大韓機械學會論文集B Vol.40 No.10
본 연구는 길이에 따른 사각 기둥 타입을 변수로 선정하여 각각의 길이 패턴을 지닌 고체 표면에서의 물 액적 젖음 특성을 분자 동역학을 이용하여 규명하였다. 기둥의 표면 형상을 정사각형과 직사각형의 형태로 가정하였고, 정해진 형상에서의 표면 면적을 증가시켰다. 정사각형 형상의 경우 각 변의 길이가4.24Å, 8.48Å, 12.72Å로 증가하였으며, 직사각형 형상의 경우 고정된 한 변은 8.48Å의 길이를 가지며 다른 한 변의 길이는 4.24Å, 8.48Å, 12.72Å로 증가하였다. 이러한 길이 변화를 통해 사각기둥 표면형상의 변화 및 전체 고체표면의 면적 대비 기둥이 차지하는 면적의 비율에 따른 물 액적의 변화를 살펴보고, 표면과 물 액적과의 접촉각을 측정하여 비교 분석하였다. A numerical study, using the molecular dynamics simulation method, was carried out to investigate the wetting characteristics of water droplets on a solid square pillar surface with variable periodic edge length patterns at the nanoscale. In this study, the pillar plane was supposed to be rectangular or square shaped. In addition, the surface area was increased while the shape of the pillar plane was kept fixed. In the case of the square pillar, the edge length increased from 4.24 Å to 12.72 Å. Also, the rectangular pillar had two types of length edges. In this case, one edge length was fixed at 8.48 Å and the other edge length was increased from 4.24 Å to 12.72 Å. Through these length changes, the hydrophobicity and hydrophilicity of a water droplet on the variable pillar surfaces were analyzed.
미용서비스 직업의 특성에 따른 미용종사자의 성과만족, 직무만족, 인지적·무인지적 만족 미치는 영향
정다운 ( Da-un Jung ),유민정 ( Min-jung Yoo ),박정은 ( Jeong-eun Park ),박동은 ( Dong-eun Park ),박은준 ( Eun-jun Park ) 한국미용예술경영학회 2013 미용예술경영연구 Vol.7 No.3
Due tothe structual change in the industrial structure, service has become a major part in the current industrial structure. Meanwhile the need for beauty increased and the beauty industry widened its spectrum. As the beauty industry subdivided, the work environment has changed, personal satisfaction has changed and the satisfaction regarding this has also changed. In this study, it is our objective to asses the satisfaction in result, job satisfaction, non-recognition and recognition satisfaction and to see what effects these satisfactions have for the beauty industry. In order to do so, this study shows the results of an analysis of primaty factors and reliability analysis. And the results wull reveal that which factors have effects on the development of the beauty industry, and reduce separation rate.
UNIX용 관계 데이타베이스 관리 시스템의 실험적 성능 평가
김미연(kim Mee Yeon),남창수(Nam Chang Soo),이인용(Lee In Yong),유민정(Yoo Min Jung),송관호(Song Kwan Ho) 한국정보과학회 1987 한국정보과학회 학술발표논문집 Vol.14 No.2
본 고에서는 UNIX 환경 하에서 주로 사용되는 관계형 DBMS인 UNIFY, INFORMIX-SQL과 관계형 데이타베이스 머신(Relational Database Machine)인 IDM(Intelligent Database Machine)을 대상으로 행해진 Dewitt Benchmark 실험결과를 분석 한다.
劉旼炡,鄭貴榮 弘益大學校 科學技術硏究所 2004 科學技術硏究論文集 Vol.15 No.-
The gas channels of the molten carbonate fuel cell (MCFC) have been studied numerically. Distributions of pressure and gas compositions in the anode and the cathode gas channels were observed. The rate constant of the electrochemical reaction was deduced with the value of hydrogen usage. Calculations were made at the different values of the reaction rate constant and also at different sizes of gas channels. The commercial fluid dynamics program, Phoenics, was used. When the volumetric velocity is constant and the height of gas channel is changed, the changes of the CO2 concentration are big when the height of gas channel is thick. When the volumetric velocity is constant and the rates of generation and consumption are multiplied by 0.5, 1 and 2, the changes of the CO2 concentration are big when the rate of generation and consumption is big. On the other hand, when the linear velocity is constant, the changes of the CO2 concentration are big when the height of gas channel is thin.
단위 연료전지 내 가스채널에서의 Phoenics를 이용한 수치모사 연구
劉旼炡,鄭貴榮 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-
The mathematical modeling of MCFC was carried out to observe the effects of the water-gas shift reaction. Using the commercial CFD program Phoenics, studies on the butterfly-type fuel cell was carried out. Calculated results were compared with those of the general type fuel cell. In previous studies, it was assumed that properties of gases along the direction of gas channel height were constant. The consumption and the generation rates of CO_(2) could be decided as the rates which gave 0.4 of the hydrogen utilization in the anode gas channel. The y-directional average values were similar to the values near the separator surface and they positioned near the electrode surface. Therefore it was shown that it is safe to assume that the gas concentration along the direction of gas channel height is constant. Effects of the size of channel height on the x-directional distribution of X_(a)co_(2) appeared greater at a constant linear velocity rather than at a constant volumetric flow rate. As expected, the x-directional distributions of Xco_(2) in the butterfly type gas channels became more uniform.
제품디자인의 조형형태론적 고찰 : 커피메이커를 중심으로
유민정 淸州大學校 1994 淸藝論叢 Vol.8 No.-
The design should adapt itself to its new circumstances that continue to change and have to create the new conditions required by a man. It is the role and responsibility of design that establish new idea as a material object about the changing need of a man with the responsibilities for the culture and contribute to the human culture. The form of modeling in the product design, whatever use it may be, must be used for a man. The emphasis is primarily placed on a man from the design processing to the completed product of design. This means to change the invisible need of a man into a practical, aesthetic means as a visible form of material. This article positively analyzed the products of coffee maker in order to grope for their desirable forms after theoritically considered for the form of modeling. As a result of analysis, it was a big body which is ornamental rather than functional in the past, but increasingly, its structual form has changed into streamline or round form from a quadrangle, therefore increasing its sense of use and beauty. Its gribe and kettle were changed into soft curves from square styles. This design is made possible by developing its technology, and its style was developed by its simplification. As an object of analysis, the limits that coffee makers have that products lacked the manufacturings technologies except for a single function. Earlier products had the device to grind Won-du coffee into flour, but this device is removed to reduce the size of coffee pot, It is estimated as a merit of simplification but a function of the product is reduced. In this case, we have to buy another machine in order to grind the coffee into flour. Also, to exchange the filter whenever used is a problem to be settled. Technology, permanent or semipermanet, that can be used as a substitute for the filter mest be developed.