• 한국기계가공학회지
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• 제18권3호
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• pp.66-73
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• 2019

Recently, FDM-type 3D printer technology has been developed, and efforts have been made to improve the output formability and characteristics further. Through this, 3D printers are used in various fields, and printer technologies are suggested according to usage, such as FDM, SLA, DLP, and SLM. In particular, the FDM method is the most widely used, and the FDM method technology is being developed further. The characteristics of the output are produced by the FDM-type 3D printer, which is determined by various factors, and particularly the perspective of the Inter-Layer Fill Factor, which is the volume ratio of the laminated material that exerts a direct influence. In this study, the Inter-Layer Fill Factor is theoretically obtained by presenting the internal space between each layer according to the laminate thickness as a cross-sectional shape model, and the cross section of the actual laminated sample is compared with the theoretical model through experiments. Then, the equation for the theoretical model is defined, and the strength change according to each condition (tensile strength of material, reduction slope, strength reduction rate, and output strength) is confirmed. In addition, we investigated the influence on the correlation and strength between laminate thickness and the Inter-Layer Fill Factor.

• BMB Reports
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• 제38권4호
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• pp.486-490
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• 2005

Genetic factors are important in the pathogenesis of coronary artery disease (CAD). Angiotensin converting enzyme (ACE) gene insertion(I)/deletion(D) polymorphism is one of the genetic factor found to be related with CAD. We investigated the association between I/D polymorphism of the ACE gene and the presence of CAD. Threehundred and seven patients (187 males and 120 females, aged between 35-80, mean $54.3{\pm}9.8$ years) who underwent diagnostic coronary angiography were included in the study. ACE I/D polymorphism was detected by polymerase chain reaction. Of the 307, 176 had CAD. The most frequently observed genotype in all subjects was ID (47.9 %). However, in patients with CAD the frequency of II genotype was lower whereas DD genotype was higher compared to the controls (p < 0.05). The number of D allele carrying subjects were also higher (p < 0.05) in CAD patients. The logistic regression analysis indicated that the ACE D allele is an independent risk factor (odds ratio = 1.48, 95% CI = 1.01-2.18, p < 0.05). In conclusion, the I/D polymorphism of ACE gene (carrying D allele) is an independent risk factor for CAD in the studied Turkish population.

• 한국정보통신학회논문지
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• 제12권12호
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• pp.2271-2276
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• 2008

본 논문에서는 3D 영상의 해상도 개선을 위한 크기가변 확대 기법 기반의 컴퓨터적 집적 영상 재생 방법을 제안한다. 먼저 컴퓨터적 집적 영상 재생 방법에서 요소 영상 사이의 간섭 문제를 설명한다. 큰 확대개수는 요소 영상의 확대 중첩 과정에서 큰 간섭을 야기하여 재생 3D 영상의 해상도를 저하시킨다. 이 간섭 문제를 극복하기 위해서 최소 확대 계수를 계산하는 방법을 제안한다. 새로운 최소 확대 계수는 해상도가 향상된 3D 영상을 제공하며, 제안하는 방법은 기존의 방법보다 계산량이 작다. 제안하는 방법의 유용함을 보이기 위해서 컴퓨터 복원 실험을 수행하고 그 결과를 보고한다.

• 만화애니메이션 연구
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• 통권28호
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• pp.101-124
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• 2012

<아바타>(Avatar, 2009)의 성공 이례로 세계 영화 및 미디어 시장에는 큰 변혁이 일어났다. 3D 입체 영상에 대해 새로운 산업적 가능성이 예측되었고 다양한 미디어 플랫폼에서 엄청난 제작지원이 이루어지기 시작했다. 전 세계의 가정용 전자제품 TV 시장동향을 보면 하드웨어 분야에서는 국내의 기술은 상당히 높은 수준의 산업적 부가가치를 창출하고 있다. 하지만 애니메이션 분야에서의 3D 입체에 대한 효과적이고 체계적인 제작 파이프라인과 사례 분석이 부족한 현실이다. 3D 애니메이션 <뽀롱 뽀롱 뽀로로>를 입체 애니메이션으로 제작한 사례분석을 통해 적합한 3D TV 입체 애니메이션 제작 파이프라인을 구축하고자 한다. 3D 입체감을 높이기에 적합한 연출적 요소와 공학적 요소 특히, 주요 관객인 아이들에게 맞는 휴먼 팩터(human factor)와 3D Sweetening 등을 함께 적용함으로써 기존의 입체 콘텐츠와 차별화하고자 한다. 이는 차세대 애니메이션의 새로운 교두보를 확보하고 한국 애니메이션의 국제적인 경쟁력을 키우는데 큰 역할을 할 것이다.

• Archives of Pharmacal Research
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• 제22권4호
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• pp.348-353
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• 1999

Possible antiinflammatory effect of eudesmin were examined by assessing the effects on tumor necrosis factor (TNF)-$\alpha$ production and lymphocyte proliferation as well as cytotoxicity against murine and human macrophages. the compound significantly inhibited TNF-$\alpha$, production by lipopolysaccaride (LPS)-stimulated murine macrophage RAW264.7 without displaying cytotoxicity suggesting that eudesmin may inhibit TNF-$\alpha$ production without any interference of normal cell function. It also significantly attenuated T cell proliferation stimulated by concanavalin A (Con A) in a dose-dependent manner.

• 한국정밀공학회지
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• 제20권4호
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• pp.197-203
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• 2003

Accurate stress intensity factor analyses and crack growth rate of surface -cracked components in inhomogeneous materials are needed fur reliable prediction of their fatigue life and fracture strengths. This paper describes an automated stress intensity factor analysis of three-dimensional (3D) cracks in inhomogeneous materials. 3D finite element method (FEM) was used to obtain the stress intensity factor fur subsurface cracks and surface cracks existing in inhomogeneous materials. To examine accuracy and efficiency of the present system, the stress intensity factor for a semi-elliptical surface crack in a plate subjected to uniform tension is calculated, and compared with Raju-Newman's solutions. Then the system is applied to analyze cladding effect of subsurface cracks in inhomogeneous materials. The results were compared with those surface cracks in homogeneous materials. It is clearly demonstrated from these analyses that the stress intensity factors for subsurface cracks are less than those of surface cracks. Also, this system is applied to analyze cladding effect of surface cracks in inhomogeneous materials.

• 한국의상디자인학회지
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• 제14권2호
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• pp.101-111
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• 2012

The purpose of this study is to evaluate the differences of visual image on variations in the length and princess line, in a silhouette of a one-piece dress with the application of the 3D Virtual Clothing System known as i-designer. Eight sample were examined: 2 variations of the length and 2 variations of the princess line, 2 variations of the form of a silhouette. The data was obtained from 66 fashion design majors. The data was assessed by a t-test and a multi-way ANOVA and factor analysis. The results were as follows; The visual image according to the design variables, four factors were selected; the attractiveness factor, the activeness factor, the practicality factor, the elegance factor. In these factors, the attractiveness factor is estimated by the most important factor. As a result of analyzing the effect of the interaction in the visual image according to the design variables, the influence of the main effect was found to be great in each factor. In the activeness factor, a significant difference was noted in the two-way interaction between the length and the princess line, the length and the silhouette. In the elegance factor, a significant difference was noted in the two-way interaction between the length and the silhouette. However, the influence on three-way interaction among the length, the princess line, and the silhouette was not significant.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 추계학술대회 논문집
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• pp.771-772
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• 2009

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(II)
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• pp.411-416
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• 2003

On the tunnel design, 3D model substituted for 2D model because of economic reason and time shortage. It is applied Load Distribution Factor, which is compared of displacement of tunnel crown, generally 50-25-25, 40-30-30 are used for tunnel design. Logicality about used Load Distribution Factor will investigated

• 한국초등과학교육학회지:초등과학교육
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• 제41권1호
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• pp.65-78
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• 2022

이 연구의 목적은 예비 교사들을 대상으로 과학적 자기 효능감 척도의 타당도 검증과 배경 변인에 따른 잠재평균분석을 통해 예비 교사 교육에서의 시사점을 도출하는 것이다. 이를 위하여 187명의 예비 교사들을 대상으로 과학적 자기 효능감 척도(Tark, 2011)를 활용한 사전 검사를 진행하였다. 그리고 탐색적 요인분석을 통해 도출한 결과를 바탕으로 전문가 협의회를 실시하여 문항을 보완한 후 354명의 예비 교사들에게 본 검사를 실시하였으며 탐색적 요인분석과 확인적 요인분석을 실시하였다. 분석 결과 사전 검사에는 과학적 자기 효능감 척도에 예비 교사들은 3개 요인으로 응답하였으나 2개 문항의 타당도가 낮게 나타났다. 수정한 척도를 활용하여 본 검사를 실시한 결과 29개 문항이 의도한 3개 요인에 적재되었음을 확인하였으며 각 요인별 신뢰도는 .882~.886으로 나타났다. 예비 교사들의 배경 변인에 따른 잠재평균분석을 실시하여 효과 크기를 도출한 결과, 성별에 따라서는 자기조절효능감(Cohen's d > .5)은 여성이 자신감(Cohen's d > .3)은 남성이 유의미하게 높은 결과를 보여주었다. 진로 계열과 과학에 대한 선호도 변인에서는 과제곤란도선호 요인과 자기조절효능감 요인에서 자연(이공)계열, 그리고 과학에 긍정적 선호를 선택한 예비 교사가 유의미하게 큰 효과크기 차이(Cohen's d > .8)를 보여주었다. 이 연구 결과를 토대로 수정된 과학적 자기 효능감 척도를 활용하면 예비 교사들의 과학 과목에 대한 자기 효능감을 정확히 진단하는데 큰 기여를 할 것이라 판단된다. 또한 과학적 자기 효능감 검사 결과를 바탕으로 예비 교사들의 과학적 자기 효능감을 효과적으로 향상시킬 수 있는 교육과정 및 교육 내용 개편에도 기여할 수 있을 것이다.