• 한국의류학회지
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• 제46권4호
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• pp.624-637
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• 2022

The purpose of this study was to develop a compression inner layer (CIL) that can be attached to dress shirts for men who have gynecomastia (male breast enlargement). For this, we developed shirts with CIL prototypes based on the functional, expressive, and aesthetic (FEA) consumer needs model. The user-centered design principle guided the design process. Based on size measurements, in-depth interviews, and an online survey, the design requirements for dress shirts with a CIL were determined, and the prototype was developed. The dress shirts were constructed of polyester and spandex mixed materials, while the CIL was made of thin mesh fabric knitted from 80% polyester and 20% spandex. A CIL prototype was developed with a front zipper fastening to hold the upper body tight and compress the breast area. The CIL was attached by connecting a strap with snap buttons to loops sewn into the shoulder line of the dress shirt. In the trial and sensory test, the prototype helped breast size decrease while meeting target consumer needs. The outcomes of this study provide necessary insights to develop garments for gynecomastia patients.

• 한국인터넷방송통신학회논문지
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• 제18권2호
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• pp.217-226
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• 2018

차량의 측면은 전면이나 후면과 다르게 비대칭으로 설계되어있기 때문에 측면충돌이 일어나는 경우 충돌부위에 따라 차체의 변형정도가 크게 달라진다. 충돌로 인하여 차체에 탄성 및 소성 변형이 일어날 때 운동에너지가 차체로 흡수되어 운동량이 감소하게 된다. 일반적으로 교통사고분석은 충돌 후 차량의 거동을 운동량 보존법칙으로 분석하며 차체의 변형에 따른 에너지 흡수량은 반발계수를 적용해 그 오차를 보정한다. 본 연구에서는 차체의 구조와 각 부품의 재료특성을 적용한 유한요소 차량모델을 LS-DYNA로 해석하였으며, 그 결과를 분석하여 SUV와 승용차의 측면충돌에서 차량의 접촉부위에 따른 반발계수와 충돌감지시간을 도출하였다. 최종적으로 산출된 반발계수와 충돌감지시간을 실제 교통사고 사례에 적용하였을 때 결과오차의 개선효과를 얻었다. 유한요소해석 모델을 이용하여 도출한 초기 입력값을 적용했을 때 기존의 분석기법보다 해석의 신뢰도가 높다는 결과를 얻게 되었다.

• 패션비즈니스
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• 제25권3호
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• pp.71-89
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• 2021

The purpose of this study was to design posture braces for rounded shoulders by examining characteristics of incorrect postures of rounded shoulders. The review of information in literature on rounded shoulder postures, correction exercise methods, and posture correction devices, has prompted this study to determine the design and material of a proper posture brace for rounded shoulders. In order to develop the pattern of a posture brace for rounded shoulders for women, the study carried out a comfort evaluation of the braces based on the 2D patterns through drafting method by utilizing the body measurements and relational formulae associated with the major body measurement such as bust circumference and on the 3D patterns of the brace which were obtained from 3D human model of women in their early 20s in Korea. Differences in angles were noted when 2D and 3D patterns of shoulder posture braces were compared. The side neck point was relocated farther outside in the 3D pattern to allow additional flexibility in the back-neck area, and the shoulder band was lowered by 14.8°, increasing armhole area comfort. The upper hemline of the front panel was found to rotate upward at an angle of 22.0° as the underarm point of the 3D pattern moved upwards than the underarm point of the 2D pattern, which enhanced comfort in the abdomen area. The 3D designs of shoulder posture brace was preferred in this study, as they significantly improved comfort while conducting fit evaluation compared to the 2D patterns of shoulder posture brace.

• 대한기계학회논문집 C: 기술과 교육
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• 제3권3호
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• pp.233-240
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• 2015

본 연구에서는 다양한 형상변수들이 봅슬레이의 공력성능에 미치는 영향을 평가하기 위하여 삼차원 Reynolds-averaged Navier-Stoke 해석을 수행하였으며, 난류모델로는 표준 k-${\varepsilon}$ 모델이 사용하였다. 격자계로는 비정렬 사면체 격자를 사용하였다. 성능 평가를 위한 형상변수로는 전방범퍼의 장축의 길이, 범퍼의 높이, 그리고, 카울링 측면과 정면 각각에서의 곡률반경 등 네가지 변수를 설정하였으며. 이들이 공력성능으로 선정된 항력계수에 미치는 영향을 평가하였다. 해석결과, 범퍼의 높이와 카울링 측면의 곡률반경이 항력계수에 민감한 영향을 미침을 알 수 있었다.

• 대한기계학회논문집B
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• 제41권11호
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• pp.709-717
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• 2017

연구는 직렬 2단 Weis-Fogh형 수차모델을 제안하고, 이 수차모델의 유체역학적 특성을 개선 와법으로 수치계산한 것이다. 기본조건 및 각 날개의 움직임은 이전에 저자가 제안한 단단 수차모델에서와 같게 했다. 두 날개(NACA0010 airfoils) 및 양쪽 수로벽은 소스 및 볼텍스 판넬로 근사하였고, 자유볼텍스는 각 물체 표면 전체에서 도입하였다. 계산변수로는 앞날개와 뒷날개의 날개 축 사이의 거리 및 두 날개 운동의 위상차 즉 동위상과 역위상으로 했다. 각 경우에 대해 비정상 유동장 및 압력장 그리고 두 날개에 작용하는 힘의 계수 및 효율을 계산하였고, 이 수차모델의 유체역학적 특성을 논의하였다.

• 한국의류산업학회지
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• 제13권4호
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• pp.600-613
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• 2011

The purpose of this study is to provide Torso pattern for Korean middle-aged women using 3D human body scan data. 155 women in their 40's or 50's were measured by Martin's anthropometry. Merging the data of 914 middle aged women provided by Korean agency for technology and standards, total of 1,069 subjects' data were analyzed. For data analysis, ANOVA, factor analysis and cluster analysis were done using SPSS PC+. And representative subject of each cluster was selected and they participated in 3D scanning and Torso pattern suggested for middle-aged women Torso pattern which investing the amount of ease according to each group for diffuse front interscye 30%, armscye circumference 30%, back interscye 40% using 3D human body scan data. The results of this study are as follows. Firstly, as a result of the factor analysis, the first factor was 'obesity index of body', The second factor was 'verticality size of body', The third factor was 'verticality length of upper bodice', The fourth factor was 'drop value to represent silhouette', and the fifth factor was 'physique of upper bodice'. And, middle-aged women type were classified 3 types according to the cluster analysis. Type 1(Y-type) was the long upper Torso with wide shoulder. Type 2(H-type) was flat-body type with comparatively thin upper bodice and thin lower bodice. And type 3(A-type) was the obese type with comparatively thin upper bodice and fat lower bodice. Secondly, using CAD program, point filtering was performed and approximated surface model was made. It used that generated surface smoothing corrected for abnormally extruded points and scattered points based on the curvature information. And 3D surfaces were flatted onto the plane by the internal tools of CAD program. Difference ratios of outline length and area between 3D curves and 2D plane were 0.42% and 0.54%, respectively. Third, wearing test by the sensory evaluation showed that distinct difference almost every category. The movement functionality test shows that, in all the tests which reveal significant differences, especially, 'comparison pattern A' experienced inconvenience to neck width and neck depth.

• 한국인터넷방송통신학회논문지
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• 제15권2호
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• pp.269-272
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• 2015

Human Body 안테나를 신체에 탈 부착하여, Superhigh Frequency RF Beam을 통해 지상(하)에 매설된 기폭제를 전방위($360^{\circ}$)로 탐지할 수 있는 Human Body 안테나 장치에 관한 연구로, 전투복을 착용한 상태에서 신체에 탈 부착식으로 장착하여 지뢰의 금속 및 비금속이 아닌 기폭제를 전방위($360^{\circ}$)로 탐지할 수 있고, 기폭제 탐지 데이터를 원격지 전투지휘 서버로 전송시켜 데이터를 공유할 수 있으며, 플렉시블 루프 방사형 안테나 구조로 Superhigh Frequency RF Beam을 전방 지면, 측방 지면으로 복수개로 방사시키고, 기폭제 전처리부를 통해 전처리시키며, 비선형회귀모델 알고리즘 엔진부를 통해 Superhigh Frequency RF Beam에 수신되는 신호세기의 지연시간에 따라 비선형적으로 감쇄하는 특성을 반영하여, 지연시간에 따른 Superhigh Frequency RF Beam 응답신호의 세기를 기반으로 지뢰 및 폭약일 가능성이 높은 신호를 검출할 수 있어, 지뢰의 금속과 비금속이 아닌 기폭제를 식별하면서 지뢰, 불발탄, 급조폭발물을 탐지할 수 있으며, 기존보다 탐지율을 90% 향상시킬 수 있다.

• 한국자동차공학회논문집
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• 제2권2호
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• pp.24-32
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• 1994

This paper is the experimental study on the vibration reduction of the 4WD vehicle through the change of the engine mounting conditions.(4 stroke diesel engine) The engine mounting conditions are changed to reduce the transmitted vibrations of the engine to the frame at the idle speed. Under the assumption that the Powertrain(Engine Transmission and Transfer Case) is a rigid body, the inertia properties of the powertrain are obtained by experimental modal analysis. And then the changed mounting conditions are studied by the decoupled vibration theory and analytical model of six degree of freedom. Though the mounting conditions are changed to improve the vibration isolation at idle speed, the vibration and the interior noise of the vehicle are reduced significantly at driving speed as well as idle speed. From the indirect endurance test of the front engine mounts, the changed mounting conditions are desirable to endurance as well as vibration reduction of the 4WD vehicle.

• 한국생활과학회지
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• 제6권2호
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• pp.145-155
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• 1997

The purpose of this study is to analyze the body type of children's, especially torso, and to provide the fundamental data for children's clothing construction which can reflect the characteristics of their bodies. The subjects for photographic measurements are 308 elementary school children aged from 6 to 8 living in Seoul and urban area. Anthropometric measurements were performed indirectly from the pictures of subjects. The data were analyzed statistically using SPSSWIN. The results obtained from this study are as follows: 1. Through one-way ANOVA, items for heights, breaths, weight reveals the significant differences according to ages and genders. 2. Through Pearson correlation, it turns out that there are high correlation between any items of heights, but there is no correlation for item of shoulder inclination with any other items. 3. Through factor analysis of principal component model, six factors were extracted which covers 83.6% of the whole information. The first factor represents the items of heights which relates with linearity. The second factor describes the items of breaths, depths, and weight in relation with laterality. The third factor were gathered with depths of front and back in relation with posture of side, which proves as important one to characterize the children's torso. The other factors represents the items of posture of neck, depths in neck, shoulder inclination, respectively. 4. Through one-way ANOVA in factor by group, and Scheffe multi comparison test for each group, the factor 1 that is related with linearity reveals the significant differences according to ages and genders.

• 대한기계학회논문집B
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• 제21권9호
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• pp.1139-1148
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• 1997

Compression waves propagating in a high-speed railway tunnel develops large pressure fluctuations on the train body or tunnel structures. The pressure fluctuations would cause an ear discomfort for the passengers and increase the aerodynamic resistance of trains. As a fundamental research to resolve the pressure wave phenomenon in the tunnel, experiments were carried out by using a shock tube with an open end. A blockage to model trains inside the tunnel was installed on the lower wall of shock tube, thus forming a sudden cross-sectional area reduction. The compression waves were obtained by the fast opening gate valve instead of a conventional diaphragm of shock tube and measured by the flush mounted pressure transducers with a high sensitivity. The experimental results were compared with the previous theoretical analyses. The results show that the ratio of the reflected to the incident compression wave at the sudden cross-sectional area reduction increases but the ratio of the passing to the incident compression wave decreases, as the incident compression wave becomes stronger. This experimental results are in good agreements with the previous theoretical ones. The maximum pressure gradient of the compression wave abruptly increases but the width of the wave front does not vary, as it passes over the sudden cross-sectional area reduction.