• 패션비즈니스
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• 제12권4호
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• pp.143-157
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• 2008

The purpose of this study was to evaluate the visual effects and images according to changes in the silhouettes and length of miniskirt. The silhouettes of the miniskirt were classified into two different categories according to side line, H-line and A-line. We altered the length of the miniskirt in five categories with changes in 25cm, 27.5cm, 30cm, 32.5cm, and 35cm. For the visual evaluation, 10 stimuli were placed in mannequins, and were estimated by the experts in the fashion design. For the visual evaluation according to changes in the silhouettes and length of the miniskirt, we used 13 pairs of items to find the visual effects, and 23 pairs of adjectives to measure the visual images. The stimuli and adjectives were randomly given to the evaluators and were evaluated by the 7-Point Likert Type Scale. The data have analyzed by frequency, t-test, factor analysis, anova, scheffe's test and the MCA method. According to the factor analysis of the visual effects of the miniskirt, the result was classified into 3 factors: the thickness of the lower body, the length of the lower body, and the shape of the lower body. According to factor analysis of the visual image of the miniskirt, the result was classified into 4 factor: personality, attraction, elegance, and activity. The silhouettes of miniskirt had more positive visual effects and images in A-Line than in H-Line. Among the visual effects of miniskirts, the length affected the thickness and length of the lower body more than the silhouette did and, the silhouette had more effects on the shape of the lower body than the length did. And shorter the skirts, stronger the image of personality. However, 32.5cm and 35cm miniskirts are estimated to be more attractive than excessively short skirts. There are many differences in the image of personality and activity according to the changes in the length of miniskirts.

• 한국생활과학회지
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• 제20권5호
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• pp.1025-1034
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• 2011

The purpose of this study was to examine the evaluation of fabric characteristics on the drapability, texture image and preference of blouse fabrics, and to analyze the effects of the texture image, objective and subjective drapability on the preference. As specimen, silk and polyester fabrics were collected. 52 female subjects evaluated 16 specimens with semantic differential scale of 18 fabric image and 20 sensibility. Data were analyzed through factor analysis, pearson correlational coefficient using spss win 12.0. For the evaluation, structural characteristics such as fiber contents, weave type, weight and thickness were analyzed. The results were as follows: The evaluation results of objective and subjective drapability showed differences. Sensory image factors of blouse fabrics were 'surface smoothness', 'elasticity', 'weight' and 'flexibility'. Sensibility image factors were 'elegance', 'classic', 'characteristic' and 'mannish'. 'Elegance', 'classic' and 'characteristic' of sensibility images showed high correlation with 'surface smoothness' and 'elasticity' of sensory image, also 'mannish' of sensibility image showed significant correlation with 'weight' of sensory image. The significant fabric characteristics affecting objective drapability were density, weight, thickness. The significant texture image factors affecting objective drapability were 'weight', 'flexibility' of sensory image and 'elegance' of sensibility image. On the other hand, the significant factors affecting subjective drapability were thickness of fabric characteristics and 'elegance', 'characteristic', 'mannish' of sensibility images. 'Elegance', 'characteristic' and 'classic' of sensibility image, 'elasticity' of sensory image and subjective drapability affected on the purchase preference.

• 소성∙가공
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• 제16권8호
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• pp.603-613
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• 2007

This paper is concerned with joining of thin metal sheets by single stroke clinching process. This method has been used in sheet metal work as it is a simple process and offers the possibility of joining similar-dissimilar thin sheet metals. Clinching generates a joint by overlapping metal sheets deforming plastically by punching and squeezing sequence. AA 5754 aluminum alloy of 0.5 mm thick sheets have been selected as a modal material and the process has been simulated under different process conditions and the results have been analyzed in terms of the quality of clinch joints which are influenced mainly by tool geometries. The rigid-plastic finite element method is applied to analyses in this paper. Analysis is focused mainly on investigation of deformation and material flow patterns influenced by major geometrical parameters such as die diameter, die depth, groove width, and groove corner radius, respectively. To evaluate the quality of clinch joints, four controlling or evaluation parameters have been chosen and they are bottom, neck thickness of bottom and top sheets, and undercut thickness, respectively. It has been concluded from the simulation results that the die geometries such as die depth and diameters are the most decisive process parameters influencing on the quality of clinch joints, and the bottom thickness is the most important evaluation parameter to determine if the quality of clinch joints satisfies the demand for industrial application.

• 한국강구조학회 논문집
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• 제19권5호
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• pp.493-501
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• 2007

최근, 국내에서는 물량절감과 경제성 확보를 목적으로 변단면 부재의 적용이 활발히 이루어지고 있으나 재료비선형을 이용한 설계방법으로는 취성파괴의 문제점에 대한 명확한 해결책을 제시하지 못하고 있으며, 변단면 부재의 초기변형, 폭두께비, 웨브 스티프너, 횡지지 거리등에 관한 연구가 부족한 실정이다. 따라서 본 연구에서는 기존에 연구된 이론식과 재료 및 기하 비선형 해석으로 신뢰성이 입증된 범용 유한요소 해석 프로그램인 ANSYS 9.0을 이용하여 춤이 큰 변단면 H형 보의 해석 모델을 완성하고 실험결과를 바탕으로 판-폭두께비와 비지지거리를 주요변수로 좌굴 및 극한내력을 평가하여, 웨브의 판폭두께비가 클 경우 좌굴내력이 감소하며, 횡 비지지 거리를 짧게 할 경우 연성능력을 향상시킬수 있음을 확인 하였다.

• Archives of Plastic Surgery
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• 제39권5호
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• pp.528-533
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• 2012

Background Rectus abdominis muscle and abdominal subcutaneous fat tissue are useful for reconstruction of the chest wall, and abdominal, vaginal, and perianal defects. Thus, preoperative evaluation of rectus abdominis muscle and abdominal subcutaneous fat tissue is important. This is a retrospective study that measured the thickness of rectus abdominis muscle and abdominal subcutaneous fat tissue using computed tomography (CT) and analyzed the correlation with the patients' age, gestational history, history of laparotomy, and body mass index (BMI). Methods A total of 545 adult women were studied. Rectus abdominis muscle and abdominal subcutaneous fat thicknesses were measured with abdominopelvic CT. The results were analyzed to determine if the thickness of the rectus abdominis muscle or subcutaneous fat tissue was significantly correlated with age, number of pregnancies, history of laparotomy, and BMI. Results Rectus abdominis muscle thicknesses were 9.58 mm (right) and 9.73 mm (left) at the xiphoid level and 10.26 mm (right) and 10.26 mm (left) at the umbilicus level. Subcutaneous fat thicknesses were 24.31 mm (right) and 23.39 mm (left). Rectus abdominismuscle thickness decreased with age and pregnancy. History of laparotomy had a significant negative correlation with rectus abdominis muscle thickness at the xiphoid level. Abdominal subcutaneous fat thickness had no correlation with age, number of pregnancies, or history of laparotomy. Conclusions Age, gestational history, and history of laparotomy influenced rectus abdominis muscle thickness but did not influence abdominal subcutaneous fat thickness. These results are clinically valuable for planning a rectus abdominis muscle flap and safe elevation of muscle flap.

• Imaging Science in Dentistry
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• 제48권1호
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• pp.51-57
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• 2018

Purpose: To perform a comparative analysis of the palatal bone thickness in Thai patients exhibiting class I malocclusion according to whether they exhibited a normal or open vertical skeletal configuration using cone-beam computed tomography (CBCT). Materials and Methods: Thirty CBCT images of Thai orthodontic patients (15-30 years of age) exhibiting class I malocclusion with a normal or open vertical skeletal configuration were selected. Palatal bone thickness was measured in a 3.0-mm grid pattern on both the right and left sides. The palatal bone thickness of the normal-bite and open-bite groups was compared using the independent t-test. The level of significance was established at P<.05. Results: The palatal bone thickness in the normal-bite group ranged from $2.2{\pm}1.0mm$ to $12.6{\pm}4.1mm$. The palatal bone thickness in the open-bite group ranged from $1.9{\pm}1.1mm$ to $13.2{\pm}2.3mm$. The palatal bone thickness was lower at almost all sites in patients with open bite than in those with normal bite. Significant differences were found at almost all anteroposterior sites along the 3 most medial sections (3.0, 6.0, and 9.0 mm lateral to the midsagittal plane)(P<.05). Conclusion: Class I malocclusion with open vertical skeletal configuration may affect palatal bone thickness, so the placement of temporary anchorage devices or miniscrew implants in the palatal area in such patients should be performed with caution.

• 한국정밀공학회지
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• 제31권7호
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• pp.623-626
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• 2014

The LBB (Leak Before Break) concept is based on evaluating the fracture toughness. NUREG 1061, Vol.3 announced that the specimen for evaluating fracture resistance needs to have same thickness or thicker than pipe. Therefore, it is difficult to collect specimen from pipe which has same thickness as a pipe. So, ASTM standard suggested the use of standard specimen with 1 inch thickness. However, it has been known that an application of LBB by test results of standard specimen is conservative compare with that by real pipe. In this study, to supplement such conservatism, the evaluation of fracture resistance characteristics was performed with curved CT specimen, which has same thickness and curvature as a pipe. In addition, fracture resistance characteristics of curved CT specimen were compared with those of CT specimen. For this, shape factor F, hpl and g were obtained from FEM analysis using the limit load method.

• 한국건축시공학회지
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• 제12권4호
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• pp.377-385
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• 2012

In this study, the Impact resistance of steel fiber and organic fiber reinforced concrete and mortar was evaluated and the improvement in toughness resulting from an increase in compressive strength and mixing fiber for impact resistance on performance was examined. The types of fiber were steel fiber, PP and PVA, and these were mixed in at 0.1, 0.5 and 1.0 vol.%, respectively. Impact resistance is evaluated with an apparatus for testing impact resistance performance by high-speed projectile crash by gas-pressure. For the experimental conditions, Specimen size was $100{\times}100{\times}20$, 30mm ($width{\times}height{\times}thickness$). Projectile diameter was 7 and 10 mm and impact speed is 350m/s. After impact test, destruction grade, penetration depth, spalling thickness and crater area were evaluated. Through this evaluation, it was found that as compressive strength is increased, penetration is suppressed. In addition, as the mixing ratio of fiber is increased, the spalling thickness and crater area are suppressed. Organic fibers have lower density than the steel fiber, and population number per unit area is bigger. As a result, the improvement of impact resistance is more significant thanks to dispersion and degraded attachment performance.

• 터널과지하공간
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• 제32권6호
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• pp.586-597
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• 2022

본 연구에서는 국내 주요 연약지반으로 알려진 낙동강 조간대 지역의 압밀침하 취약성 평가에 활용할 상부 점성토층의 위치별 두께 정보를 추정할 수 있는 모델을 개발하였다. 두께정보 추정을 위하여 기계학습 알고리즘인 RF (Random Forest), SVR (Support Vector Regression), GPR (Gaussian Process Regression)과 지구통계기법인 정규크리깅(Ordinary Kriging)을 이용한 4가지 공간추정 모델을 개발하고 상호 비교하였다. 모델 개발을 위하여 수집한 연구지역의 시추공 자료 4,712개 중 상부점성토층이 존재하는 2,948개의 시추공 자료를 사용하였으며, 개발된 모델들의 성능을 정량적으로 평가하기 위하여 피어슨(Pearson) 상관계수와 오차제곱평균(mean squared error)을 사용하였다. 또한, 정성적 평가를 위하여 연구지역 전역에 상부점성토층의 두께를 추정하여 점성토층의 지역별 분포 특성을 상호 비교하였다.

• 한국방사선학회논문지
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• 제16권4호
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• pp.395-403
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• 2022

본 연구에서는 디지털방사선영상 시스템에 사용되는 평판형 검출기(flat-panel detector, FPD)를 이용하여 조직 등가 물질인 폴리메틸메타아크릴레이트(Polymethyl Methacrylate, PMMA)의 두께 변화에 따라 발생되는 산란선이 영상품질의 영향으로서 해상력 평가의 변조전달함수(modulation-transfer function, MTF)와 잡음력 스펙트럼(noise-power spectrum, NPS)으로 정량적인 영상 평가를 위한 연구를 수행하였다. 해상력-차트 팬텀 영상으로 PMMA 두께가 증가할수록 산란선의 영향이 커져 변조특성이 저하 되는 것을 알 수 있고 영상이 밝다. 결과는 영상의 잡음이 많아진다는 것을 알 수 있는데 공간주파수 별로 확인하기 위해 푸리에 변환으로 잡음력 스펙트럼 영상을 얻었다. 그러므로 영상에서 피사체로서 PMMA 두께 증가에 따라 산란선의 변화를 MTF로 평가하여 해상도 특성변화와 2차원 잡음력 스펙트럼을 1차원 값으로 나타낸 결과를 통해 PMMA 두께와 잡음은 비례하는 것을 확인할 수 있다.