• 한국의류학회지
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• 제44권6호
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• pp.1070-1086
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• 2020

This study analyzed the size of women in their 60s, 70s and 80s in the 2014 Human Body Dimension Survey data among Size Korea's 7th Human Dimension Survey Data in 2015. This study examined the characteristics of changes in female body shape according to aging and the age range. The height item gradually decreased from the 60s and then rapidly decreased to the 80s. In the case of the circumference item, a sharp change occurred in the section from 69 to 70 years old. The reduction in hip height, waist height, and navel level waist height was not significant compared to the decrease in stature. Both width, thickness, and circumference gradually decreased with age. It can be seen that the back bends forward and the legs become thinner than the body due to the aging phenomenon with increasing age. Even for older women, the characteristics of aging differ in their 60s, 70s and 80s, so age segmentation of silver clothing should be considered.

• 융합정보논문지
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• 제9권8호
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• pp.20-26
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• 2019

본 연구에서는 무한고장 NHPP 로맥스 수명분포의 형상모수 변화에 따른 소프트웨어 신뢰성 모형의 속성을 새롭게 분석한 후 최적의 형상모수 조건을 제시하였다. 소프트웨어 고장현상을 분석하기 위하여 모수추정은 최우추정법을 사용하였고, 비선형 방정식의 계산은 이분법을 적용하였다. 그 결과, 형상모수(k)의 변화에 따른 속성을 비교하였을 때 형상모수가 작을 수록 참값에 대한 예측능력이 우수하고, 신뢰 속성이 효율적임을 알 수 있었다. 본 연구를 통하여, 소프트웨어 개발자들은 형상모수에 근거한 소프트웨어 고장형태를 사전에 파악함으로서 신뢰도를 성장시킬 수 가 있으며, 또한, 소프트웨어의 신뢰속성을 향상시키는데 필요한 기본정보로 활용할 수 있을 것으로 기대한다.

• 한국정보통신학회논문지
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• 제15권10호
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• pp.2223-2230
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• 2011

심전도는 심근허혈, 부정맥, 심근경색과 같은 심장질환의 진단에 이용된다. 특히 심근허혈은 ST 세그먼트의 형태 변화가 나타나는데, 이러한 변화는 일시적으로 나타나며 특별한 증상을 동반하지 않는다. 따라서 지속적인 모니터링을 통해서 ST의 일시적인 변화를 검출하는 것이 매우 중요하다. 이에 본 연구에서는 심근허혈 진단을 위한 ST세그먼트 형태 분류 알고리즘을 제안한다. 이는 전처리 과정과 적응가변형 문턱치를 통해 R파와 각 특징점을 검출 한 후 S와 T파사이의 굴곡점으로부터 특정한 기울기 정보를 추출하여 ST의 기울기 기준점과 비교함으로써, 검출된 ST를 6가지 형태로 분류하는 방법이다. 개발된 알고리즘은 심전도로부터 ST 레벨 변화 구간을 검출하고, 검출된 구간에 대해서도 ST의 형태를 분류함으로써 심전도 레벨 변화뿐만 아니라 형태에 대한 정보도 제공한다. 제안한 알고리즘의 심근허혈 패턴 진단 성능을 평가하기 위해서 European ST 데이터베이스를 사용하였다. 성능 평가 결과 가장 높은 분류성공률은 99.4%이며, 낮은 성공률은 68.48%를 나타내었다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 춘계학술대회 논문집
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• pp.808-811
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• 2000

The product of stereolithography is consist of gathering the single strand. Therefore the accuracy of the shape is related to the linear shrinkage of the single strand. The resin temperature change affect on curing properties. This article will propose the interaction between material temperature and shape accuracy by resin temperature control. The main concern of this article is related to the improvement of end product's shape accuracy by the persuit for the filles curing criterion.

• 한국의류학회지
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• 제34권11호
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• pp.1779-1785
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• 2010

The experiment is designed to create some useful data on the dressed shapes that contribute to simulating the adaptability of clothes. We studied the dressed shapes of blouse with above-elbow sleeves and sleeveless according to five types of arm movement (basic posture, reach forward 45, 90, and reach lateral 45, 90) in the stand-posture. Experiments were conducted to understand the dressed shape through 3-D measurement Vivid 910 and to investigate the width, depth, area distribution and gap of the shape of blouses on the section map with a software program for 3-D shape analysis, Rapid Form 2004. The Data were analyzed by factor analysis. The results of this study are as follows: The ratio of depth per width in the stand-posture was lower than other arm movements and the reach lateral was higher than the reach forward. The gap of the upper body was a briefed 4 factor; front, front-side, back, and back-side. It was higher than the sleeveless with a change of the gap in the dressed blouse with above-elbow sleeves by arm movements per stand-posture. The divisional gap shows the adaptability of clothes according to the types of blouse and arm movements in the change of the ratio.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2008년도 학술발표회 논문집
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• pp.2136-2140
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• 2008

최근 환경생태학적 하천관리가 중시되면서, 하천의 지형태를 고려한 하천복원 및 관리업무가 필요하게 되었다. 본 연구에서는 시계열 항공영상을 이용하여 갑천과 유등천의 지형태 변화를 검토하였다. 특히 보나 교량과 같은 하천시설물이 새로 설치되거나 해체된 지점, 그리고 갑천과 유등천이 합류되는 지점을 선정하여 시계열별로 유량의 변화 및 물의 흐름방향 등을 파악할 수 있었다. 또한 물의흐름 특성에 의한 퇴사의 양상도 함께 검토함으로서 도심하천의 유지수량 및 환경생태학적 하천복원 업무 수행시 중요한 의사결정자료로 제공이 가능하게 되었다.

• 대한기계학회논문집
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• 제14권3호
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• pp.617-623
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• 1990

본 연구에서는 표면방향과 깊이 방향으로 표면균열의 피로성장률이 다르게 나 타나고 있는 경우의 표면균열 형상변화를 표면균열의 균열 열림을 고려하여 해석할 수 있는 식이 수정 제안되었으며, 압력용기 소재에서 측정된 표면균열의 형상변화와 본 연구에서 제안된 형상 변화식에 의한 예측과 비교 분석하였다. 또한 균열 성장과 형 상변화를 평균 응력강도계수에 대해 분석하였고 다른 표면균열 형상 변화식들에 의한 표면균열 형상변화해석이 같이 비교 검토되었다.

• 한국기계가공학회지
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• 제16권5호
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• pp.126-133
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• 2017

This report investigates the stress distribution according to the location and shape change of the circular hole for the lightweight design of the cross beam of a railway passenger car and studies the lightweight design. To design a lightweight cross beam with a circular hole, we selected the non-circular crossbeam as a basic model, examined the stress distribution and displacement by position and determined the location, shape, size and quantity of the hole for light weight. We analyzed the effects of the position and shape of the hole on the maximum equivalent stress and displacement. The influencing factors were set as the design parameters, and the stress value was examined according to the variation of each variable. By considering the stress value according to the change of each variable and selecting the design parameter with the narrowest scattering value of the stress at each position of the hollow cross beam with various hole positions and shapes, we studied a cross beam with a circle hole under identical load condition to have an equal stress distribution to that of a non-circular cross beam.

• Corrosion Science and Technology
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• 제22권1호
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• pp.64-72
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• 2023

Ni-Ti shape memory alloy for dental nerve treatment devices was prepared by adding Mo to Ni-Ti alloy to improve flexibility and fatigue fracture characteristics and simultaneously increase corrosion resistance. Surface properties of the alloy were evaluated. Microstructure analysis of the Ni-Ti-xMo alloy revealed that the amount of needle-like structure increased with increasing Mo content. The shape of the precipitate showed a pattern in which a long needle-like structure gradually disappeared and changed into a small spherical shape. As a result of XRD analysis of the Ni-Ti-xMo alloy, R-phase structure appeared as Mo was added. R-phase and B2 structure were mainly observed. As a result of DSC analysis, phase transformation of the Ti-Ni-Mo alloy showed a two-step phase change of B2-R-B19' transformation with two exothermic peaks and one endothermic peak. As Mo content increased, R-phase formation temperature gradually decreased. As a result of measuring surface hardness of the Ti-Ni-Mo alloy, change in hardness value due to the phase change tended to decrease with increasing Mo content. As a result of the corrosion test, the corrosion potential and pitting potential increased while the current density tended to decrease with increasing Mo content.

• 한국가시화정보학회지
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• 제21권3호
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• pp.75-84
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• 2023

In this study, we conducted analysis of bubble dynamics and flow of liquid phase change material(PCM) using shadowgraphy and particle image velocimetry(PIV). Characteristics of internal flow varied depending on locations of injection when solid PCM was liquefied from heated vertical wall. When bubbles rose immediately, they exhibited elliptical shape and zigzag trajectory. In contrast, when bubbles rose after merging at the bottom of solid PCM, with equivalent diameter for the inter-wall distance of 0.64 or greater, they showed a jellyfish shape and strong rocking behavior. It was observed by the PIV that the small ellipse bubbles made most strong flow inside the liquid PCM. Furthermore, the flow velocity was highest in the case of front injection, as the directions of temperature gradients and bubble-driven flow were aligned. The results underscore the significant influence of injection location on various characteristics, including bubble size, shape, rising path of bubbles, and internal flow.