• Geomechanics and Engineering
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• 제29권6호
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• pp.667-681
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• 2022

This paper presents a thermoelastic analysis of variable thickness plates made of functionally graded materials (FGM) subjected to mechanical and thermal loads. The thermal load is applied to the plate as a temperature difference between the top and bottom surfaces. Temperature distribution in the plate is obtained using the steady-state heat equation. Except for Poisson's ratio, all mechanical properties of the plate are assumed to vary linearly along the thickness direction based on the volume fractions of ceramic and metal. The plate is resting on an elastic foundation modeled based on the Winkler foundation model. The governing equations are derived based on the third-order shear deformation theory (TSDT) and are solved numerically for various boundary conditions using the differential quadrature method (DQM). The effects of various parameters on the stress distribution and deflection of the plate are investigated such as the value of thermal and mechanical loads, volume fractions of ceramic and metal, and the stiffness coefficients of the foundation.

• 월간산업보건
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• 통권168호
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• pp.13-19
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• 2002

• 한국의류산업학회지
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• 제14권2호
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• pp.294-303
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• 2012

This study was designed to develop air force mechanic parka, evaluate it, and ultimately provide functionally superior parka to the air force. The development process was 1) conducting a survey, 2) identifying problems and shortcomings of currently-supplied parkas, and 3) improving the design, pattern and materials. The newly-developed parkas were evaluated in terms of their ease of fit, clothing mobility, and insulation. Ease of fit was evaluated by subjects' sensory tests, and clothing mobility was by fitness-for-motion tests and range-of-motion tests using a Goniometer. Evaluation on insulation was conducted by thermal manikins. Findings of this study were as follows: 1. In the subjective evaluation on clothing mobility, new parkas were considered to have sufficient ease of fit while previous ones scored much lower, confirming the improvement of the new version. 2. Both subjective tests and ROM measurements on fitness for motion verified the superiority of the new parkas. 3. Insulation tests found that although insulation capability of newly-developed parkas was at a similar level to those of the previous ones, their insulation capability per unit weight was superior, demonstrating that new parkas were better at blocking heat conduction. When making changes in parka patterns and designs to enhance the mobility, it was necessary to maintain the insulation function. The new parkas developed by this study was verified to be superior to the previous ones in their insulation and clothing mobility.

• 복식문화연구
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• 제23권2호
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• pp.294-309
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• 2015

This study aims to clarify the aesthetic values between emotion of human and expression of technology in contemporary fashion as it analyzes formative characteristics of related cases in fashion based on principles of 3D Printing technology and the viewpoint of mechanic aesthetics. The conclusions of this study are as follows. First, 3D Printing fashion is not only expressed diverse variations by its principles of formative methods, materials and properties, but also changes of silhouette by applying system of designers. Second, general characteristics of 3D Printing fashion is represented by various applications in SLS system, and it can be specifically explained application to a portion of clothing, decorative roles of clothing, complicated pattern making through crossing fabrics using 3D scanner and displaying a certain object changing fashion styles, and so forth. Third, the formative characteristics of 3D Printing fashion from the perspective of mechanic aesthetics is as follows. It can be analyzed as the integration of metaphysical values through compared symbolization of natural feature and technical evolution, partial dynamics and interactive velocity-based, formative combinations for abstract expression using architectural components, cosmos images and substantialized structures through images of organic space interacted human shapes. As the mention above, 3D Printing technology can creative a diverse area of fashion, and express images of new technological fashion through various works with continuous development of techniques.

• 만화애니메이션 연구
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• 통권50호
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• pp.275-297
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• 2018

일본의 메카물 애니메이션은 전 세계 범위에서 널리 알려져 있고 유명한 작품들이 많이 있다. 1952년, 일본 최초의 메카닉 애니메이션이며 최초의 TV 애니메이션인 <우주소년아톰>은 탄생한 후부터 긴 세월에 걸쳐 지금까지 인 기가 있다. 아톰은 한 시대의 코드로서 많은 사람에게 영향을 주었다. 일본 메카닉 애니메이션은 자신만의 독특한 특색과 세계관을 대중에게 전달하고 있다. 본 논문은 일본 90년대에서부터 지금까지 폭발적인 인기를 얻고 있는 <신세기 에반게리온> 메카닉 디자인을 <기동전사 건담>과 비교분석을 통해 일본 메카닉 디자인의 변화를 알아보고자 함에 있다. 이런 분석 결과는 애니메이션에 반영된 일본 문화와 사상을 알려 줄 것이며 이는 애니메이션의 문화반영을 보여주는 좋은 사례가 될 것이 기대한다. <신세기 에반게리온>은 1995년에 상영한 후 일본 애니메이션계에 예상치 못한 영향을 주었으며 지금까지도 이를 재해석하고 분석하는 사람들이 끊임없이 나오고 있다. 이는 작품 자체가 가지고 있는 미스테리와 끝나지 않은 결론을 예상하기 위한 관객들의 반응이라 할 수 있다. 그런 특징을 반영하듯 에반게리온의 디자인에도 다른 메카물과 차별되는 디자인적 요소들을 찾아볼 수 있다. 인체 생명공학을 기반으로 한 메카닉 디자인은 기계라는 한계성을 극복하고 더욱 인간다운 모습을 느낄 수 있도록 한다. 인간 본성을 담을 수 있는 파일럿의 탑승구조는 엔터리 플러그라는 형식으로 강화되었고, 전굴 자세는 꼿꼿한 로봇이 아닌 인간다움을 더 부각시킨다. 이렇듯 <신세기 에반게리온>은 인간의 정체성을 반영할 수 있는 메카닉 디자인을 추구하고 있다. 80년대의 메카닉 애니메이션으로 <건담>을 뽑을 수 있는데, 90년대의 <신세기 에반게리온>이 이를 전혀 다른 디자인으로 보여주고 있다. 그러므로 두 작품의 메카닉 디자인을 비교해봄으로써 작품의 메시지와 디자인의 상관관계를 살펴본다. <신세기 에반게리온>에서 메카닉 디자인의 정체성과 작품 내용의 밀접한 관계를 제시한다. 향후 메카닉 디자인에게 좋은 사례 및 이론적인 바탕이 될 수 있음을 시사하려고 한다.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2002년도 춘계학술대회 논문집
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• pp.41-46
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• 2002

The general purpose of this paper is Evaluation of material properties in spring steels by investigate correlation between ultrasonic attenuation and virker's hardness, charpy impact properties, microstructures. The three test speciments of the $490{\times}90 mm$ plates and 20 mm thick are used but differ in heat treatment, one is rolled plate, the second is quenched and then tempered, and the third is quenched. ultrasonic attenuation were obtained at fifteen locations on the plates. In order to investigate the correlation between hardness ( especially, HV ) and the attenuation, the virker's hardness and the microstructures were observed for three spring steels. also the charpy impact test were carried out at the room temperature in order to investigate the relationship between impact properties and the attenuation. The experimental results obtained from three different spring related to the heat treatment conditions and attenuation coefficient is increased with increasing the hardness(HV). Ultrasonic attenuation coefficients have shawn are ability to distinguish among spring steels.

• Steel and Composite Structures
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• 제26권5호
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• pp.533-547
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• 2018

In this paper the time-dependent creep analysis of a thick-walled FG cylinder with finite length subjected to axisymmetric mechanical and thermal loads are presented. First order shear deformation theory (FSDT) is used for description of displacement components. Inner and outer temperatures and outer pressure are considered as thermo-mechanical loadings. Both thermal and mechanical loadings are assumed variable along the axial direction using the sinusoidal distribution. To find temperature distribution, two dimensional heat transfer equation is solved using the required boundary conditions. The energy method and Euler equations are employed to reach final governing equations of the cylinder. After determination of elastic stresses and strains, the creep analysis can be performed based on the Yang method. The results of this research indicate that the boundaries have important effects on the responses of the cylinder. The effect of important parameters of this analysis such as variable loading, non-homogeneous index of functionally graded materials and time of creep is studied on the behaviors of the cylinder.

• 한국IT서비스학회지
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• 제1권1호
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• pp.81-117
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• 2002

The generalization of Internet use has been spreaded all over the world and impacted company to introduce intranet and extranet for their operation which dealt with electronic commerce. For these reason, endeavor of implementation of web site system is promotioned and enhanced the possibility of adaptation range for the view of company. Dramatic competition which company faced with the use of internet and request from all over the world made company brought company to various and different type of level. It is necessary to develop website system with experty knowledge to satisfy customer needs. To deal with this situation, works from the level of government should proposed to spread whole country business which propelled through kyungnam mechanic industry information promotion center. With strategic proposal concerning district characteristics to adapt electronic commerce successfully, information promotion should performed. Support of government is needed continuously to realize infra of ASP composed of 4,877 mechanic industry company. It might be possible to deal with international rapid change with cooperation of company and government related department.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 추계학술대회
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• pp.617-620
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• 2009

전 세계적으로 메카닉 애니메이션의 인기는 꾸준히 이어지고 있다. 한국은 '로봇 태권브이' 이후 여러 메카닉 애니메이션을 제작했다. 그러나 애니메이션이 하나의 문화장르로 인정받지 못해 생긴 제약으로 애니메이션의 수준이 대중의 기호를 만족시키지 못했다. 그리하여 한국 애니메이션은 외면 받았고 그로인해 애니메이션의 제작이 줄어들게 되었다. 본 논문은 한국 메카닉 애니메이션이 거쳐 온 역사와 현 상황을 일본 메카닉 애니메이션인 기동전사 건담과 비교 분석하고, 한국 메카닉 애니메이션의 향후 발전 가능성에 대해 제시하는 것에 목표를 두고 있다.

• Advances in concrete construction
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• 제15권2호
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• pp.115-126
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• 2023

This paper investigates creep analysis of a plate made of Al-SiC functionally graded material using Mendelson's method of successive elastic solution. All mechanical and thermal material properties, except Poisson's ratio, are assumed to be variable along the thickness direction based on the volume fraction of reinforcement and thickness. First, the basic relations of the plate are derived using the Love-Kirchhoff plate theory. The solution of governing equations yields an elastic solution to start creep analysis. The creep behavior is demonstrated through Norton's equation based on Pandey's experimental results extracted for Al-SiC functionally graded material. A linear variation is assumed for temperature distribution along the thickness direction. The creep strain, as well as the thermal strain, are included in the governing equations derived from classical plate theory for mechanical strain. A successive elastic solution based on Mendelson's method is employed to derive the history of stresses, strains, and displacements over a long time. History of stresses and deformations are obtained over a long time to predict damage to the plate because of various loadings, and material composition along the thickness and planar directions.