• 한국정밀공학회지
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• 제24권6호
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• pp.78-85
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• 2007

In this study, we performed finite element analysis for the design of a medical centrifuge and two-types of centrifuge were compared with each other. The types of centrifuge are 2-arm straight type and 3-arm type. Structural analysis was done with respect to the change of the rotational speed of the rotor of a centrifuge. When the rotor of centrifuge was rotated, the von Mises stress of 2-arm straight type-rotor was compared with the von Mises stress of 3-arm type. The margin of safety was estimated from the result. We found the critical speed of centrifuge from the campbell diagram by modal analysis.

• 한국어류학회지
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• 제24권4호
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• pp.247-252
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• 2012

한국산 송사리속 2종에 대한 섭이기관의 구조적 차이를 알아보기 위하여 악골 및 이빨 구조를 조사하였다. 악골에서 송사리 Oryzias latipes는 전상악골 중앙부의 등 쪽 가장자리에 움푹 들어가는 홈이 존재하였으나 대륙송사리 O. sinensis는 일직선이었다. 후반부의 위치에서 송사리는 중앙부와 일직선상에 존재하였으나 대륙송사리는 배 쪽에 존재하였다. 또한 송사리는 하악골의 구상돌기 아래로 이어지는 치골 뒷가장자리에 움푹 들어가는 홈이 존재한 반면에 대륙 송사리에서는 뒷가장자리가 일직선 모양을 하였다. 송사리는 성적이형으로서 수컷에서만 나타나는 큰 이빨이 하악골의 측면 방향으로 발달하였고, 대륙송사리는 등 쪽 방향으로 발달하였다. 한편 송사리의 이빨형태는 원뿔모양과 화살촉모양 2 types이 나타난 반면에 대륙송사리에서는 원뿔 모양 1 type만 나타나는 특징을 보였다. 이상과 같이 한국에 분포하는 2종의 송사리는 섭이기관에서 뚜렷한 종간의 특징을 잘 보여 주었다.

• 한국운동역학회지
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• 제27권2호
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• pp.141-147
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• 2017

Objective: We obtained force-displacement curves for countermovement jumps of multiple heights and examined the effect of an arm swing on changes in vertical jumping strategy. Countermovement jumps with hands on hips (Condition 1) and with an arm swing (Condition 2) were evaluated to investigate the mechanical effect of the arm movement on standing vertical jumps. We hypothesized that the ground reaction force (GRF) and/or center of mass (CoM) motion resulting from the countermovement action would significantly change depending on the use of an arm swing. Method: Eight healthy young subjects jumped straight up to five different levels ranging from approximately 10% (~25 cm) to 35% (~55 cm) of their body heights. Each subject performed five sets of jumps to five randomly ordered vertical elevations in each condition. For comparison of the two jumping strategies, the characteristics of the boundary point on the force-displacement curve, corresponding to the vertical GRF and the CoM displacement at the end of the countermovement action, were investigated to understand the role of arm movement. Results: Based on the comparison between the two conditions (with and without an arm swing), the subjects were grouped into type A and type B depending on the change observed in the boundary point across the five different jump heights. For both types (type A and type B) of vertical jumps, the initial vertical force at the start of push-off significantly changed when the subjects employed arm movement. Conclusion: The findings may imply that the jumping strategy does change with the inclusion of an arm swing, predominantly to modulate the vertical force advantage (i.e., the difference between the vertical force at the start of push-off and the body weight).

• 복식문화연구
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• 제25권5호
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• pp.561-576
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• 2017

The purpose of this study was to classify the upper torso body types of obese Korean adult women using the 7th Korea National Anthropometric Study data and compare the body type differences according to three age groups: 20s~30s, 40s~50s, and 60s. A total of 548 adult women whose BMI was in the obese range of 25 or higher and whose age ranged from 20s to 60s were selected from the anthropometric database. Twenty-nine body measurements related to torso and arm areas important for torso and sleeve pattern development were chosen. Five drop values by differences between bust, waist, and hip circumferences were also chosen for analysis. The number of obese women increased with age. The results revealed seven factors according to the factor analysis and three obese body types based on the cluster analysis. Body type 1 (47.3% of obese women) was characterized by narrow shoulders, a small or medium torso, and a straight waist. Body type 2 (42.4% of obese women) was characterized by a defined waist and a larger lower torso than upper torso. Body type 3 (10.3% of obese women), the largest obese body type among the three types, was characterized by a large bust, large abdomen area, and long upper torso. Women in their 20s to 30s were most likely to have body type 2, women in their 40s to 50s were evenly distributed between body types 2 and 3, and women in their 60s were most likely to have body type 1.

• 복식
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• 제26권
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• pp.279-288
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• 1995

The objective of the study was to provide fun-damental data on somatotype for elderly women by classifying the somatotype and analyzing the characteristics of their somatotype. The subjects were 368 women ages of 60∼84, they were measured direct anthropometry. In or-der to find out differences among the age groups, the 368 subjects were grouped into two age groups(Group 1 aged 60 to 69, Group 2 ; aged 70 to 84) Data were analyzed using Factor analysis, Cluster analysis, Duncan test and Analysis of variance. The results of this study were as follows. 1. The characteristics of Elderly women's somatotype were bending of the upper-torso, fat-ness of the waist and abdomen, drooping of the bust and shoulder and hip. In addition, height, girth, depth and width items were decreased in their sizes respectively. 2. Through the factor analysis, we extracted 5 factors from anthropometric measurements. Factor components were obesity, height, girth of the leg and arm, length of the upper-torso except the center front length, the center front length, we categorized by 4 clusters using 5 factor scores. And after the cluster analysis using 5 factor scores, 4 clusters were categorized. The characteristics of clusters were as follows. Type 1 was characterized by short, obesity type, and droopy bust. Type 2 was characterized by short and slender type, dropped bust, and bending somatotype from the lateral view. Type 3 was characterized by middle sized and straight somatotype from the lateral view. Type 4 was characterized by tall and obese type from the lateral view.

• 한국의류학회지
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• 제35권2호
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• pp.146-155
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• 2011

This study examines the design characteristics of figure skating costumes by a content analysis of their design elements. The content analysis method for the study was used based on 185 photos of female figure skaters. A total of 218 coding units in 15 categories were used. In the category of color, unicolor costumes were the mainstay and represented 48.11% of the total costumes. Black costumes showed the highest rate (13.51%), followed by red (7.57%) and blue (7.03%). In the dual-color costumes, combinations of red and black and white and black, represented 4.32% of all costumes. A camisole was the most popular type of neckline (20.54%). Stand collars with neck decorations were found in 5.95% of the costumes. In addition, 98.2% of all figure skating costumes had decorations (crystal beads 21.86% were the most frequently used decoration type), 65.41% exposed all the shoulders and arms, 70.81% of the costumes did not have sleeves, 5.41% of the costumes had arm decorations, and 3.78% had wrist decorations. In the analysis of the hem of skirts, 32.40% had a curved line, 30.73% had a straight line, and 15.08% had an unrecognizable form. In general, the figure skating costumes have stand collars with neck decorations, arm and wrist decorations, and irregular skirt hems that are not found in everyday dresses. To emphasize and intensify a theatrical effect, the costumes were fabulously decorated with spangles, crystal beads, feathers, and lace; black, red, and blue were frequently used. The skirts had frills, fringe, flared lines, and beads on them to reflect the stage lights and emphasize movements.

• 전자공학회논문지
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• 제50권9호
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• pp.12-20
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• 2013

본 논문에서는 주파수 재구성 기능이 가능한 방사 구조 갖는 co-planar waveguide (CPW) 급전 방식의 영차 공진 안테나를 제작하고 측정하였다. 제안된 안테나의 단위 셀은 직렬 metal-insulator-metal (MIM) 형태의 커패시터와 두개의 단락된 병렬 스터브 인덕터로 구성되어 있다. 제안된 안테나는 두 개의 단위 셀을 갖는 composite right/left-handed (CRLH) 전송 선로에 근거하여 설계되었으며 선로의 끝단을 개방하여 선로의 병렬부에서 주된 전자파 에너지 방사가 이루어지도록 하였다. 안테나의 크기를 소형화시키는 동시에 다이오드 스위치 부착을 통하여 주파수 재구성 안테나를 구현하기 위하여 비아를 통하여 접지 면과 연결되어지는 4개의 $90^0$ 접혀진 단락 스터브 선로를 병렬 인덕터 구조로 사용하였다. 제안된 안테나의 영차 공진주파수는 3.09 GHz이고 전체 크기는 $0.22{\lambda}_0{\times}0.16{\lambda}_0$이다. 제작된 안테나의 측정 결과 영차 공진 주파수 2.97 GHz에서 안테나의 최대 이득과 임피던스 대역폭은 각각 3.1 dBi와 56MHz를 나타내었으며, 삼중 대역에서 동작하는 주파수 재구성 안테나시스템에 응용이 가능하다.

• 한국의상디자인학회지
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• 제19권4호
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• pp.123-137
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• 2017

The purpose of this study is to suggest sleeve cap height with a satisfying wearing sensation and appearance on jackets for women in their twenties so that high-consumer demand jackets can be produced. Five experimental jackets with sleeve cap heights of [(AH/3)-1cm], [(AH/3)-0.5cm], [AH/3], [(AH/3)+0.5cm] and [(AH/3)+0.8cm] were made for 30 subjects to try on after which the subjects were then surveyed for their assessment of appearance, wearing sensation and preference. On the basis of the results, the optimum height of the sleeve cap has been proposed along with the following contents and results of this research. 1. [AH/3] [(AH/3)+0.8cm] of sleeve cap height was assessed to beof desirable appearance. 2. [AH/3] of sleeve cap height garnered a high opinion in terms of intuitive wearing sensation, while [(AH/3)-1cm] [AH/3] were the heights with overall satisfaction of intuitive and movement wearing sensations. If discomfort in the upper sleeve at 'straight arm' posture can be tolerated, the sleeve cap height can be set to [(AH/3)-1cm]~[(AH/3)+0.5cm]. 3. [AH/3] and [(AH/3)+0.5cm] were found to have a high preference among wearers, which indicated that the women in their twenties prefer a slim type of sleeve, putting appearance above wearing sensation. Consequently, [AH/3] is desirable when appearance, wearing sensation and preference are considered, [(AH/3)+0.5cm] is fit for business uniform for static duties or formal dress focused on aesthetic impression and [(AH/3)-1cm]~[AH/3] are desirable for work clothes when considering active duties.

• 생물환경조절학회지
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• 제26권3호
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• pp.215-220
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• 2017

접수 및 대목 줄기의 회전 절단으로 인한 접목 불량 발생 가능성에 대한 문제점을 해결하기 위하여 수학적 분석 및 고속카메라를 이용하여 실측한 결과 칼날 회전반경 50mm이고 줄기직경이 5mm 일 때, 깊이는 0.11mm인 것으로 계산되어 줄기부 곡면 절단에 따른 문제는 없을 것으로 사료된다. 또한 접목시스템에서 모종 줄기를 잡는 그립퍼의 최적 형상 설계를 위하여 실시한 모종 줄기 압축시험 결과 대목의 경우 0.8mm 이상, 접수의 경우 0.6mm 이상의 범위에서 줄기부를 압축 할 경우 이전 형상으로 완전히 복원되지 않는 것으로 조사되어 그립퍼 형상 설계 시 그럼퍼 간격 결정에서 고려해야 할 것으로 사료된다. 또한 접목시기인 토마토 모종의 경우 줄기의 휨이 평균 10도 전후 인 것으로 조사되어 접목불량이 발생할 가능성이 있으므로 이를 개선하기 위한 추가 연구가 필요할 것으로 사료된다. 최적핑거 형상 시험에서는 모서리핑거 형상이 핑거간 거리 조정을 통해 정확한 중앙점을 잡을 수 있는 것으로 조사되었다. 핑거간 거리는 접수와 대목에 대해 각각 2.5mm와 3.0mm로 설정하고 신축성 있는 재질을 이용하여 1mm 두께로 코팅을 하면 대부분의 모종 줄기를 상처없이 파지 할 수 있을 것으로 조사되었다.