• Journal of the Korean Society of Clothing and Textiles
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• v.30 no.12 s.159
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• pp.1723-1729
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• 2006

Drapability is an important factor determining the end-use of fabrics. In this research, characteristics of drapability of men's and women's suit fabrics were analyzed. The hand and the preference for suit fabrics were measured by the subjective and objective evaluations. To find out the details of the drapability characteristics of suit fabrics, the drape was measured by using Cusick drape tester and was processed by image analysis software. Seasonal difference was obvious both in men's and women's fabrics. The average drape ratio of women's S/S suit fabrics showed the highest value, 0.724, then decreased in the order of men's F/W> men's S/S> women's FW. Wave amplitude showed the same order to the drape ratio. Men's fabrics were more drapable in spring and summer season rather than in fall and winter season. Women's fabrics showed the opposite trend, in other words, S/S suit fabrics were less drapable than F/W fabrics. There was also a significant difference in drape ratio between men's and women's fabrics regardless of season. For S/S, men's fabrics were more drapable than women's ones, whereas, for F/W, women's fabrics were more drapable.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.407-409
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• 2003

직물의 질감을 객관화시키는 연구는 고부가가치의 의류제품을 생산하고 판매하는데 매우 중요한 요소이다. 섬유제품의 표면 거칠기에 대한 연구를 통해, 인간이 섬유제품에서 느끼는 촉감과 그러한 촉각을 느끼게 하는 여러 물리적, 기계적 요인들과의 관계를 조사하고, 인간이 제품을 만질 때 느끼는 감성을 객관화 하여 감성적인 제품의 생산에 응용할 수 있는 자료를 마련해 보고자 한다. 질감은 직물의 역학적 성질과 표면 상태에 따라 좌우되는데 직물은 경사와 위사가 서로 엮어지고 짜여져 표면굴곡과 이방성을 가지게 된다. (중략)

• Korean Journal of Applied Biomechanics
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• v.18 no.3
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• pp.83-92
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• 2008

Y. W. KIM, Y. J. KIM, Mechanical Properties of Unilateral & Bilateral Movements in Isokinetic Knee Extension and Flexion. Korean Journal of Sport Biomechanics, Vol. 18, No. 3, pp. 83-92, 2008. The purpose of this study was to examine the mechanical properties and patterns of bilateral and unilateral movement under varying velocities and movement patterns. The unilateral and bilateral isokinetic knee extension and flexion were taken for three speeds of 13 healthy male subjects. Although there was bilateral facilitation at the speed of $450^{\circ}$/s for the bilateral movement of knee extension, as a whole there was less resultant torque and power of bilateral movement than summed unilateral under knee flexion and extension of 3 velocity condition. There was significant correlations between bilateral deficits within individuals observed for an the same movement($120^{\circ}-240^{\circ}$ flexion, $120-240^{\circ}$ extension, $240^{\circ}-450^{\circ}$ extension), which means that same agonist was recruited. On the contrary, although there was a tendency of a similar pattern of the individuals bilateral deficit according to the varying velocities, there was not a significant correlations between bilateral deficits of flexion and extension within individual, which means that different agonist was recruited. With the analyses of this results the individuals neuromuscular characteristics and the effecting factors for bilateral movement can be speculated upon.

• Journal of Fashion Business
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• v.9 no.5
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• pp.37-50
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• 2005

The purpose of this study is to present basic data that can express beautiful silhouette by studying visual effect that depend on waist position of basic pants and the change of round belt width and analyzing the study of visual effect of the pattern design as well as the effect of design component. The stimuli are 21 samples: 7 variations of the location of the waistline and 3 variations of the width of the belt. The data has been obtained from 35 fashion design majors. The data has analyzed by frequency, factor analysis, anova, scheffe's test and the MCA method. The visual effects by the location of waistline and the width of belt are composed of 3 factors : horizontal direction factor, vertical direction factor and flexuosity factor. In these factors, horizontal factor is estimated by most important factor. Visual effect is positive when belt width widens as the location of waist line goes down to position of low belt. And in case the location of waist line is in the position of natural waist belt and low rise belt, belt of 3.2cm width is effective visually. The interaction effects between the location of the waistline and the width of the belt have significant differences in all factors. Factor that appears in visual effect of basic pants can be evaluated differently according to pattern of pants and characteristic of body shape. So we may receive better visual assessment if we consider the location of waist belt and width of belt in side of visual effect and image, when we produce pants giving variety to crotch depth.

• Journal of Korean Society of Forest Science
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• v.6 no.1
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• pp.27-31
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• 1967

The bamboo is a plant whose culm grows straight up. This growing characteristics has been widely utilized in industry and craft. But the developments of handcraft making and horticultural techniques in recent years become to demand the bent bamboo culms. This study has been conducted at the experimental grove located at Hyunnae Ri, Okkye Myun, Myungju Gun, Kangwon Do since 1960. Although it has been known that the secret for which bamboo shoots complet growth within 40 odd days lies in their rhizomes, this writer felt the bamboo culm sheath might be another factor in addition. Hence some were stripped of sheath in this bending study as the following: 1. Time of sheath stripping. 2. Direction of sheath stripped for arbitrary bending. 3. Accuracy of bending following the size (growth) of bamboo shoots. The following results were obtained: 1. Bamboo shoots begin to appear in April. But the bamboo shot up in June showed the best bending result with 68% of bending efficiency. 2. Bending of the culm was facilitated by stripping off the sheath located on the side of the direction toward which bending was desired. By doing this, the culm could be bent as much as 90 degrees. But the culm totally stripped of sheath could be bent in any direction. 3. In order to determine the accuracy of bending of bamboo shoots growing, sheath were stripped off the shoots of which height ranged from 10 centimeter to 150 centimeters. The shoots with height of 110 centimeters showed the best result with 90%.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.11a
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• pp.209-213
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• 2000

피혁 제품의 품질을 결정함에 있어 제일 중요한 요인은 눈에 보이는 표면상태이다. 지금까지는 피혁공장에서 대부분의 피혁을 육안으로 선별하여 오고 있는데 이러한 방법은 등급을 구분하는데 많은 노동력과 시간이 소모되고, 일관성이 부족할 뿐만 아니라 미세한 결함이나 정밀한 치수를 감지할 수가 없어 그 등급의 품질에 문제가 발생한다. 이런 문제를 해결하기 위해 본 논문에서는 실시간 영상처리와 AI를 이용하여 피혁 자동 등급 선별 시스템을 설계하고자 한다. 제안한 선별 시스템의 설계는 세계 피혁업계와 차별을 기하고 검사시간을 단축하여 생산 효율성을 증대하면, 등급의 표준화 및 품질의 고급화를 도모할 수 있다.

• Korean Journal of Applied Biomechanics
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• v.19 no.4
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• pp.647-653
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• 2009

The purpose of this study was to investigate the differences between female and male ballet dancers in anterior cruciate ligament injury risk factors during the box drop landing task. Nine female and nine male collegiate ballet dancers participated in this study. Kinematic and ground reaction data were collected and combined with inverse dynamics to estimate the knee extensor and abductor moment. EMG data from the biceps femoris and rectus femoris were used to estimate the ratio of quadriceps-hamstrings muscle activity. No gender differences in anterior cruciate ligament injury risk factors were found during the box drop landing task. A significant relationship was found between female and male ballet dancers in the knee flexion angle.

• Journal of the Korean Applied Science and Technology
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• v.36 no.2
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• pp.424-433
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• 2019

The purpose of this study was to investigate the effects of gender difference in injury experience on biomechanical variables of lower extremity during two leg drop landing. 20 male(injury experience=8, non-injury experience=12) and 20 female(injury experience=11, non-Injury Experience=9) in their 20's were selected as subjects. Two-way mixed ANOVA was performed on the biomechanical variables obtained from the two leg drop landing in a 45cm height box and post-test was performed with bonferroni adjustment(p <.05). The results of this study suggest that the group of female who injury experience could induce the reduction of the peak vertical ground reaction force by increasing the valgus and internal rotation of the knee joint and flexion and internal rotation of the hip joint. In the INE(injury non-experienced) female group, the peak knee flexion angle was the smallest, as well as the flexion of the hip joint and the external rotation angle, and the peak vertical ground reaction force was the highest. On the other hand, the INE female group showed high vertical ground reaction force because they did not utilize the knee and hip joints relatively than the IE(injury experienced) female group, this means that it is relatively exposed to the risk of injury. Therefore, it was found that gender difference in injury experience is a factor affecting factors of knee and hip joint movement and peak vertical GRF(ground reaction force).

• Economic and Environmental Geology
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• v.54 no.6
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• pp.615-627
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• 2021

The Baekildo fault, a dextral strike-slip fault developed in Baekil Island, Goheung-gun, controls the distribution of tuffaceous sandstone and lapilli tuff and shows a complex fracture system around it. In this study, we examined the spatial variation in the geometry and connectivity of the fracture system by using circular sampling and topological analysis based on a detailed fracture trace map. As a result, both intensity and connectivity of the fracture system are higher in tuffaceous sandstone than in lapilli tuff. Furthermore, the degree of the orientation dispersion, intensity, and average length of fracture sets vary depending on the along-strike variation in structural position in the tuffaceous sandstone. Notably, curved fractures abutting the fault at a high angle occur at a fault bend. Based on the detailed observation and analyses of the fracture system, we conclude as follows: (1) the high intensity of the fracture system in the tuffaceous sandstone is caused by the higher content of brittle minerals such as quartz and feldspar. (2) the connectivity of the fracture system gets higher with the increase in the diversity and average length of the fracture sets. Finally, (3) the fault bend with geometric irregularity is interpreted to concentrate and disturb the local stress leading to the curved fractures abutting the fault at a high angle. This contribution will provide important insight into various geologic and structural factors that control the development of fracture systems around faults.

• Proceedings of the Korean Reliability Society Conference
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• 2011.06a
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• pp.131-140
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• 2011

도로안전시설용 시선유도봉은 통상 도로에 설치되어 운전자의 시선을 유도하고 차선을 분리하는 용도로 사용된다. 이러한 시선유도봉은 주로 도로상에 설치되기 때문에 차량과 부딪히는 경우가 자주 발생하므로 제품의 내구성이 특히 요구된다. 종래의 시선유도봉에 대한 평가방법은 제품의 일부를 채취하여 재료의 기본 품질 성능만을 평가하였다. 그러나 현장의 도로관리를 담당하고 있는 수요기관에서는 빈번한 사고와 민원으로 인해 제품의 평가방법에 대한 문제 제기를 하였고, 완제품 상태로 신뢰성을 평가할 수 있는 방법 개발을 요구하였다. 따라서 본 연구에서는 시선유도봉의 주요 고장 요인이 되는 차량 충돌에 의한 재질 파손, 바퀴 압축에 의한 회복 불능, 제품 표면에 부착되는 반사시트의 박리 및 변색에 대한 고장 메커니즘 분석하고, 이러한 고장을 재현할 수 있는 신뢰성 평가법을 개발하고자 하였다. 주요 고장 메커니즘 분석을 위해 국내.외 평가 기준을 조사하였으며, 특히 미국 AASHTO's (American Association of State Highway and Transportaion Officials)의 NTPEP (National Transportation Products Evaluation Program)에서 수행하고 있는 내구성 평가 방법에 대한 사례 조사를 통해 국내 적용을 검토해 보았다. 또한 서울시설관리공단의 협조로 가장 주요한 고장의 요인으로 꼽히는 차량 충돌 시험을 올림픽대로 내 조각공원에서 실시하였다. 그 결과 시험실에서 고장을 재현할 수 있는 신뢰성 평가 장비 개발의 필요성이 부각되었으며, 차량 충돌과 바퀴 압축을 모사할 수 있는 신뢰성 평가 장비를 제작하였다. 시선유도봉의 신뢰성 평가는 기본적인 품질성능평가 이외에 신규로 개발된 충격시험(고온, 저온, 반사지)과 굴곡압축시험, 반사지와 재질의 내후성 시험을 실시하였다. 또한 국내 9개사(社) 10개 제품에 대한 신뢰성 비교평가를 실시한 결과, 제품의 내구성에 중요 척도가 되는 신뢰성 평가 기준을 설정할 수 있었고, 합리적인 제품의 가격 수준과 품질 수준에 대한 신뢰성 가이드를 제공할 수 있었다.