실내모형실험에 의한 핵석 풍화대 지반 특성 산정

우익 ( Ik Woo ) 대한지질공학회 2007 지질공학 Vol.17 No.3

본 연구에서는 풍화대에 분포하고 있는 핵석지반에 대한 지질공학적 조사와 실내모형실험을 통하여 핵석지반의 공학적 물성을 산정하였다. 핵석이 노출된 세 곳의 산사면에 대한 조사창 조사와 시추공 코어 관찰로 핵석의 분포도와 기하학적 모양을 분석하였다. 현장 핵석분포 및 크기에 대한 조사 자료와 모형실험용 공시체 시편의 크기를 바탕으로 산정된 축소율을 고려하여 5mm이하-평균 2mm의 분쇄-연마된 핵석시료를 실내핵석실험용으로 사용하였다. 핵석 체적함유비를 0%, 10%, 20%로 달리하면서 토양 직접전단시험 및 석고모형실험을 실시하였고, 이를 통하여 핵석지반의 특성을 구하고자 하였다. 핵석함유 토양의 직접전단실험에서는 핵석 함유량의 증가로 인하여 전단강도가 증가하는 경향을 보여주었다. 핵석함유비가 20%일 경우는 핵석 입자의 맞물림에 의한 점착력의 증가가 마찰각의 변화보다 더욱 전단강도의 상승을 유발시키는 요소로 작용하였다. 핵석 함유비를 달리한 석고모형실험에서는 핵석이 많아질수록 모형시료의 강도 및 탄성계수가 증가하는 경향을 보여주었다. 석고모형실험에서 얻어진 핵석 함유량에 따른 모형의 물성변화률을 현장에서 측정한 풍화대의 물성과 비교하여, 현장에서 핵석함유에 따른 물성을 예측한 결과, 핵석 함유가 0%에서 10%로 증가하면 18%의 일축압축강도 증가를, 핵석 함유가 20%로 증가되면 30%의 일축압축강도 증가를 유발하는 것으로 예측이 되었다. This study shows the prediction of the engineering properties of weathered zone bearing corestones through the engineering geological surveys and the scale model test in the laboratory. The window survey and the observation on the borehole core were peformed on three natural slopes in corestones area in order to analyse the distribution pattern and the geometrical properties of corestones. Natural corestones were crushed and abrased for the scale model test into less than 5 mm in maximum-2mm in average by the scale reduction ratio based on the size of natural corestones and the specimen size. Scale model tests were carried out on soil and plaster model specimens with different corestone content ratio - 0%, 10%, 20%. The direct shear test on soils shows that shear strength is increased by the increase of corestone content ratio. The increase of cohesion is, however, more important factor to the shear strength of soil for 20% corestone content ratio due to interlocking of crushed corestone particles. The plaster model test shows a tendance of increase of UCS and modulus of elasticity with increase of corestone content. The variation ratio of specimen property by change of corestone content ratio in plaster model test was applied to in situ properties in order to estimate the properties of weathered zone bearing corestones. So it could be predicted that the increase of corestone content to 10% and to 20% produce about 18% and 30% UCS`s increase respectively.

보문 : 국내 30대 남성용 웨트수트 패턴 축소율에 관한 연구

최진희 ( Jin Hee Choi ) 한국의류학회 2011 한국의류학회지 Vol.35 No.9

This research develops a basic design structure for scuba diving wetsuits suitable for the shape of Korean men in their 30`s as well as enhances the reduction rate for underwater activity. The clothing pressure and fitness tests were performed using four different types of body suits. The usable data of the tests were coded for further statistical analysis that includes one way-ANOVA test and S-N-K Multiple Range Test by using SPSSWIN 17.0. An analysis of the results shows: (1) The results of the clothing pressure test (using a dummy) indicated that the larger the reduction rate, the stronger the clothing pressure gets (with an exception on the knee area). It has great impact on clothing pressure with regards to the different body parts. The different reduction rates should be applied to body parts accordingly. (2) In the case of test subjects, the overall mean values of the clothing pressure were lower than the ones with the dummy (attributable to the cushion function of body skin and muscle as well as the high stretch of the fabric). (3) In evaluating the subjective fit test of four types of body suits, a statistically significant difference was found in the relation between pattern reduction rates and all parts of the body. It was revealed that the reduction rate of ``B`` pattern (X: 4%, Y: 3%) was the most suitable pattern and the ``B`` pattern scored highest in the motion functional fit test performed by a test subject.

축소모형실험 폭원으로서 도폭선의 폭력조절

양형식(Hyung-Sik Yang),김종관(Jong-Gwan Kim),최미진(Mi-Jin Choi),최병희(Byung-Hee Choi),류창하(Chang-Ha Ryu) 한국암반공학회 2007 터널과지하공간 Vol.17 No.4

도폭선의 길이를 조절하여 폭력이 조절되도록 축소모형 실험하는 방법을 제안하였으며 콘크리트 블록의 발파에 적용하여 타당성을 검토하였다. 제안된 방법은 폭원 조절이 가능하고 또 축소모형실험 방법으로서 타당한 것으로 판단된다. 또 폭발열을 이용하여 산정한 폭원 축소율은 상당한 근거가 있는 것으로 판단되었다. A method using detonating cord was suggested to control the blasting source for scaled model test. Blasting of 5 concrete block was carried out to verify the method. It was proved that blasting power can be controlled by suggested method. It seemed to be reasonable to use the reduction ratio based on the explosion heat.

폭원의 축소율 산정과 축소모형 실험에의 적용

정도영 ( Do Young Jung ),양형식 ( Hyung Sik Yang ) 대한화약발파공학회 2004 화약발파 Vol.22 No.4

철근콘크리트 축소모형의 발파해체실험을 위한 상사법칙 및 축소율

박훈 ( Hoon Park ),유지완 ( Ji Wan Yoo ),이희광 ( Hee Gwang Lee ),송정언 ( Jung Un Song ),김승곤 ( Sung Kon Kim ) 대한화약발파공학회 2007 화약발파 Vol.25 No.1

축소모형실험을 위한 기초 연구

양형식 ( Hyung Sik Yang ),하태욱 ( Tae Wook Ha ),김원범 ( Won Beom Kim ),김종관 ( Jong Gwan Kim ),류창하 ( Chang Ha Ryu ),최병희 ( Byung Hee Choi ) 대한화약발파공학회 2007 화약발파 Vol.25 No.1

보문 : 심전도 측정을 위한 밀착 의복 연구 -패턴 축소 및 주관적 평가를 중심으로-

정연회 ( Yeon Hee Jeong ),양영모 ( Young Mo Yang ) 한국의류학회 2012 한국의류학회지 Vol.36 No.11

This study develops tight-fitting upper clothing to measure electrocardiography (ECG) data. Taking into consideration the elasticity of the clothing, we made 4 experimental clothes by applying to each a weft re-duction rate of 40%, 50%, 60%, and 70%. The 4 experimental clothes were used to measure resting ECG, exercise ECG, and post-exercise ECG for 4 men in their 20s. We compared clothing pressures using sensors on the human body and on a dressform. Subjective wear sensations of the 4 experimental clothes were eva-luated using a subjective 7-point scale (with 7 being most excellent). We measured clothing pressures by using the air type pressure (AMI 3037-2) for upper and lower chest sensors in the developed tight-fitting upper clothing. The lower chest sensor showed that the clothing pressure on a human body and dressform changed consistently as the weft reduction rate decreased. The upper chest sensor showed inconsistent cha-nges in clothing pressure as the weft reduction rate decreased. The wearing-test result for preliminary sud-jects showed that the lower chest sensor was more stable than the upper chest sensor, therefore, we inserted the sensor at the lower chest position before performing ECG Except for Subject 4, the resting ECGs were stably measured for 3 subjects(Subject 1, Subject 2, and Subject 3) in all the developed clothes(A cloth-ing, B clothing, C clothing, and D clothing). However, D clothing showed stable ECG values after exer-cise. The results of the experiment showed that we could measure ECG without difficulty using clothes with a weft reduction rate of 40% when the movement was not intense: however, tight-fitting upper clothing with a weft reduction rate of 70% was necessary to measure exercise ECG and post-exercise ECG values.

복부 가열 패드를 부착한 상의 베이스 레이어의 여유량에 따른 인체 반응

이경미,홍경희,이예진,Lee, Gyeongmi,Hong, Kyunghi,Lee, Yejin 한국의류학회 2017 한국의류학회지 Vol.41 No.4

To figure out an appropriate pressure level for a body warming base layer, human responses were observed when the pattern reduction of base layers varied. Under the condition of $2^{\circ}C$, 60% RH, 0.1m/s, ten male subjects participated in the experiment with four sizes of experimental vests where heating pads were attached. The subjective evaluations of the heating vests with different sizes were reported using 7 or 9 point scales. We simultaneously observed chest, abdomen and scapula skin temperatures and microclimate humidity. It was found that the tight pattern as in the case of A or B provided a warmer subjective sensation and skin temperature than C or D; however, there were no differences in skin temperature at the chest. Eventually, the chest temperature decreased after about 30 mins of heating; however, temperature of abdomen increased and indicated that heating with two commercial pads used was inadequate for whole body warming. The pressure sensation of 'tight' was improved after warming the abdomen in a cold environment. Overall, the gaps beyond the original circumference of the abdomen, as in C or D, were not desirable for the local heating of abdomen under the conditions of this experiment where walking was included in the protocol. The experiment garment B with nude waist circumference was the best, and D with the largest ease, was the worst for a comfortable warming vest.

밀착 의복 개발을 위한 원단의 방향에 따른 부위별 변화량 및 의복압 연구

이옥경(Lee, Okkyung),이희란(Lee, Heeran),이예진(Lee, Yejin),김소영(Kim, Soyoung) 한국생활과학회 2021 한국생활과학회지 Vol.30 No.3

3차원 쉐이핑 기술을 활용한 스포츠 브래지어 개발

김소영 한국의류산업학회 2019 한국의류산업학회지 Vol.21 No.4

This study used 3D technology to develop a multi-functional sports brassiere with increased comfort and fit that can be worn as a base layer during exercise or as underwear. A 75A size industrial lingerie figure was used to develop a standard pattern. 3D tools for scanning and pattern making, such as Vivid 910, Geomagic Design X, 2C-AN and Yuka CAD were used. The sports brassiere was designed as a tank top style with dual structure and linings attached to a pad utilized with a sport brassiere mold cup. 3D outer and lining’s pattern was differently developed in consideration of the body’s curvature with pad’s shape and structure. Shoulder and neck part reduction rates were adjusted to increase the neck areas fit that considered the nude pattern’s structure due to uncomfortableness felt by wearers who were uncomfortable with the neck areas fit on existing brand products. The reduction rate was also set differently on each part. For example, the reduction rate on outer side panel was set strongly to increase the breast’s volume. Two products, developed by a 3D sports brassiere and previously released product, were worn on 8 subjects in their 20’s to evaluate fit, comfort, and purchase preferences. The evaluation proved that newly developed 3D products were superior to comparative products. The results of the clothing pressure measurement indicate that the newly developed sports brassiere’s front part had less pressure on upper bust and shoulder areas compared to comparative products as well as showed less pressure on the back side, which shows improved wearing comfort compared to comparative products.