• 한국응용과학기술학회지
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• 제35권4호
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• pp.1478-1486
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• 2018

Liquid crystals offer plenty of useful activities as improving the stability of emulsion, increasing moisturizing power, drug release, improving skin feeling and visual effect for cosmetics fields. In order to prepare stable semi-transparent gel emulsion, liquid crystal emulsification method was used. The emulsion stabilities of systems containing glycerin, fatty alcohols, surfactants, water and oil were investigated at various temperatures as time passed. The stabilities of all emulsions were evaluated by means of a polarizing microscope, SEM, rheometer, colorimeter and DSC. Even though the samples stored at $50^{\circ}C$ thermostatic chamber were occurred the reduction of hardness, turbidity and ${\Delta}H$ and the peak shift, the semi-transparent gel emulsion was very stable without separation between water and oils phase in emulsion.

• 한국운동역학회지
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• 제34권2호
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• pp.71-80
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• 2024

Objective: This study aimed to explore the brain connectivity between brain and biomechanical variables by exploring motion recognition through FFT (fast fourier transform) analysis and AI (artificial intelligence) focusing on quiet standing movement patterns. Method: Participants included 12 young adult males, comprising university students (n=6) and elite gymnasts (n=6). The first experiment involved FFT of biomechanical signals (f_CoP, f_AJtorque and f_EEG), and the second experiment explored the optimization of AI-based GRU (gated recurrent unit) using f_EEG data. Results: Significant differences (p<.05) were observed in frequency bands and maximum power based on group and posture types in the first experiment. The second study improved motion prediction accuracy through GRU performance metrics derived from brain signals. Conclusion: This study delved into the movement pattern of upright standing posture through the analysis of bio-signals linking the cerebral cortex to motor performance, culminating in the attainment of motion recognition prediction performance.

• 복식
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• 제41권
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• pp.153-168
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• 1998

The purpose of this study is to examine, specifically, the external and internal characteristics of anti-fashion expression in the Korean student movement after the 1945 Liberation. The dress expressed in the student movement represented the purity of student and characterized resistance, and this character expressed strongly in 80s, faded from middle of 90s. Until the 60s, the student movement was not characterized by, so activist students wore dress and suits. It symbolized students as an elite group of society. They added on head-bands to express resistance. In the 70s, activist students wore school uniforms, school military training wear, blue jeans and loose shirts in demonstrations. They tried to express re-bellion against the government and the older gen-eration. In the 80s, the period was remarkably distingusihing by the economic growth at that time. Activist students wore T-shirts with Korean letters and popular paintings specially made, Korean costumes, wrapped in the Taggeuki (Korean national flag), and refused wear on jeans because of anti-Americanism. They also wore masks, muffled their faces, and got their heads shaved. These anti-fashions are very strong expressions for the national independence spirit, national traditional heitage, anti-foreign power and anti-American. In the early 90s, activist students wore reformed Korean costumes specially made group uniforms, after that they wore casual everyday clothes with caps. They tried to express remarkable resistance in the early 90s, but after the mid-90s expression of resistance weakened and faded, so there was no distinction between activist and non-activist. There are the reasons why the student movement changed after the peaceful transfer of political power.

• 한국산학기술학회논문지
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• 제12권6호
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• pp.2691-2697
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• 2011

본 논문은 대학교 육상단거리 선수와 태권도 선수의 근력, 근 파워를 비교하기 위하여 등속성 근력검사기기를 이용하여 기초체력, 슬관절의 근력($60^{\circ}$/sec), 근 파워($180^{\circ}$/sec)를 분석하여 육상 단거리 선수와 태권도 선수의 근기능 특성을 밝히고자 하는데 목적으로 수행되었다. 기초체력은 육상 단거리 선수가 태권도 선수에 비해 높게 나타났으며, 기초체력 중 좌악력과 순발력에서 통계적으로 높게 나타났다. 슬관절의 근력은 육상 단거리 선수가 태권도 선수에 비해 높게 나타났으나, 근 파워에서는 태권도 선수가 육상 단거리 선수에 비해 통계적으로 차이가 높게 나타났다. 이와 같은 결론을 종합해 볼 때, 육상 단거리 선수와 태권도 선수는 근력뿐만이 아니라 순발력을 필요로 하고 있으며, 등속성 근 기능의 측정에서는 태권도 선수는 체중조절을 요구하는 경기의 특성 때문인지 평균파워와 체중당 평균파워에서만 통계적으로 높게 나타났다. 그러므로 차후 연구에서는 각각의 운동 종목별 근 기능을 분석을 하는 것이 필요한 실정이며, 태권도 선수와 유사한 특성을 가진 투기종목에서도 근 기능을 분석하는 연구가 필요 할 것으로 사료된다.

• 한국철학논집
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• 제35호
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• pp.43-71
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• 2012

조선 시대의 재지사족은 핵심적인 지배집단이었다. 그들은 전국적으로 분포한 중소 규모의 지주였으며, 유교적 소양을 보유한 지식인 집단이었다. 17세기 이후로는 곳곳에 동성마을을 형성하고, 현조(顯祖)를 내세우면서 지역 사회에 대한 영향력을 행사했다. 그 결과 지역에서의 실질적 주도권을 재지사족이 행사하는 예가 많았다. 이런 면에서 제천 지역의 황강(黃江) 신동(新洞)에 정착한 안동 권씨 화천군파(花川君派) 문중은 대표적인 재지사족이었다. 이 집단은 1675년에 이뤄진 권상하 형제가 이주하면서 형성되었다. 노론 정파의 지도자였던 송시열의 수제자인 권상하는 과거를 외면하고 황강에서 강학에 힘썼으며, 결국은 산림(山林)으로 초빙되어 좌의정으로 제수되기까지 하였다. 권상하의 사후에 그가 가르치던 곳에는 황강서원을 비롯한 기념 시설과 제사 공간이 설치되었다. 이러한 시설들은 권상하가 중시했던 삶의 가치를 후손들이 받아들이는데 이바지했고, 지역 사회에 숭명의리(崇明義理)에 토대를 둔 척사적(斥邪的)인 정서가 자리 잡도록 하는데 이바지했다. 화천군파가 제천 지역에서 재지사족으로 성장하는 과정에 결정적인 역할을 한 인물은 또 다른 인물은 권상하의 조카인 권섭(權燮)이었다. 그는 권상하를 위한 여러 기념시설을 건립하고, 문중의 발전을 위하여 여러 규칙을 제정하였다. 아울러 황강을 넘어서 제천의 신동에 새로운 거주공간을 확보하고, 청풍 단양 문경 등지에 별서(別墅)를 장만하며 거주공간을 넓혀 나갔다. 각각의 공간에는 조상을 모시기 위한 제사 시설도 설치했다. 그 결과 권상하와 권섭의 자손들은 제천 일대에서 대표적인 성씨 집단으로 수백 년간 위세를 누릴 수 있었다. 비록 그들은 서울에 남았던 이들에 비하여 많은 엘리트 관료를 배출할 수는 없었다. 그러나 이러한 재지사족의 성장은 지역 사회의 문화적 성장, 나아가 전 조선 사회의 발전을 가능하게 했다.

• Steel and Composite Structures
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• 제25권3호
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• pp.347-360
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• 2017

The goal of this study is to fill this apparent gap in the area about vibration analysis of multiwalled carbon nanotubes (MWCNTs) curved panels by providing 3-D vibration analysis results for functionally graded multiwalled carbon nanotubes (FG-MWCNTs) sandwich structure with power-law distribution of nanotube. The effective material properties of the FG-MWCNT structures are estimated using a modified Halpin-Tsai equation. Modified Halpin-Tsai equation was used to evaluate the Young's modulus of MWCNT/epoxy composite samples by the incorporation of an orientation as well as an exponential shape factor in the equation. The exponential shape factor modifies the Halpin-Tsai equation from expressing a straight line to a nonlinear one in the MWCNTs wt% range considered. Also, the mass density and Poisson's ratio of the MWCNT/phenolic composite are considered based on the rule of mixtures. Parametric studies are carried out to highlight the influence of MWCNT volume fraction in the thickness, different types of CNT distribution, boundary conditions and geometrical parameters on vibrational behavior of FG-MWCNT thick curved panels. Because of using two-dimensional generalized differential quadrature method, the present approach makes possible vibration analysis of cylindrical panels with two opposite axial edges simply supported and arbitrary boundary conditions including Free, Simply supported and Clamped at the curved edges. For an overall comprehension on 3-D vibration analysis of sandwich panel, some mode shape contour plots are reported in this research work.

• 복식
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• 제52권4호
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• pp.51-63
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• 2002

The purpose of this study is to review the symbolic meaning in 20th century men’s fashion through analyzing of social environment factors. After recent industrial society, men had expressed their privilege, prestige and social power according to fashion. Men's fashion at the beginning of the 20th century was emerged as the images of robustness and strictness with perfect cutting, thick and stick fabric and dark color that were influenced by british style. It was symbolic meaning of authority orientation which showed the superiorities of social and sex classes. It was beginning of change according to social phenomena. The world war Ⅰ,Ⅱ and change of lifestyle by material affluence in automobile industry mollified rules of men's fashion. It showed a serenity of living. Also, the growth of young culture changed trickle-down of men's fashion into bottom-up and showed opposition for elite culture in fashion. These change particularly became acceleration by Individualism, open-society and the collapse of sex class. Men expressed sexual and inherent desire for fashion that was no longer concerned with symbolizing of authority but rather with pleasure pursuit.

• 한국의류산업학회지
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• 제6권5호
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• pp.539-548
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• 2004

The purpose of this study is to know outer and inner characteristics of Bobos style regarded the latest fashion and to estimate the characteristics of fashion trend in 21st century and direction of fashion in the future, In terms of contentions of this study, we firstly studied concept, background, general characteristics which had been introduced in Sociology. And then, we studied the effect which the style of Bobos had been given by investigating the concept and style of Hippies and Yuppies. Also, we analysed trend of Bobos represented in modem fashion and tried to examine outer and inner features of Bobos through the result of analysis. Bobos can defined as 'Bourgeois Bohemian' who have both mundane desire about success and are high-educated elite class in information-oriented society. The fashion styles which had affected Bobos were psychedelic, naturalism, unisex, ethnic, layered, grunge of Hippies in 1960s and traditional, power-look, contemporary-look, sports wear, casual wear of Yuppies in 1980s. As a result of examining features of Bobos style, we can know that outer feature of Bobos style showed a reasonable harmony regardless of formalities and inner features showed a tendency to seek comforts. Also, Bobos style showed various and free styles, textile materials and colors and complex features to transcend the time and region, and culture.

• Structural Engineering and Mechanics
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• 제74권2호
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• pp.297-311
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• 2020

The main purpose of this study is to analyze the effects of external pressure on the vibration and buckling of functionally graded (FG) spherical panels resting of elastic medium. The material characteristics of the FG sphere continuously vary through the thickness direction based on the power-law rule. In accordance with first-order shear deformation shell theory and by the use of Ritz formulation the governing equations are presented. In this regard, the beam functions are applied in two-dimensions for different sets of boundary supports. The Winkler and Pasternak models of elastic foundations are also taken into account. In order to show the validity and applicability of the presented formulation, various comparison studies are given. Furthermore, a diverse range of numerical results is reported to check the impacts of geometrical and material parameters along with external pressure on the vibration and buckling analysis of FG spherical panels.

• Structural Engineering and Mechanics
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• 제55권5호
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• pp.1001-1014
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• 2015

Bending analysis of functionally graded (FG) nano-plates is investigated in the present work based on a new sinusoidal shear deformation theory. The theory accounts for sinusoidal distribution of transverse shear stress, and satisfies the free transverse shear stress conditions on the top and bottom surfaces of the plate without using shear correction factor. The material properties of nano-plate are assumed to vary according to power law distribution of the volume fraction of the constituents. The size effects are considered based on Eringen's nonlocal theory. Governing equations are derived using energy method and Hamilton's principle. The closed-form solutions of simply supported nano-plates are obtained and the results are compared with those of first-order shear deformation theory and higher-order shear deformation theory. The effects of different parameters such as nano-plate length and thickness, elastic foundation, orientation of foundation orthtotropy direction and nonlocal parameters are shown in dimensionless displacement of system. It can be found that with increasing nonlocal parameter, the dimensionless displacement of nano-plate increases.