• 한국정밀공학회지
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• 제29권9호
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• pp.995-1002
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• 2012

In a refrigerator, many food boxes are stored, so the flow of chilly air has very complicate stream paths inside the room of a refrigerator. Moreover, on some occasions, there is no flow of chilly air in a space due to blocking flow paths by food boxes, which is an important issue to be settled for improving the ability of food storage with fresh states. One of methods to solve this problem is to redesign the flow-pattern of chilly air to be uniform flow inside room, if possible. In this work, we have tried to design the duct-structure for the uniform flow of a chilly air using a FE-analysis method. And we conducted real commercial tests using a refrigerator having the redesigned duct. The results showed that good agreements with general requirements.

• Nuclear Engineering and Technology
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• 제50권7호
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• pp.1079-1087
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• 2018

There are many parameters that affect the natural circulation flow, such as height difference, heating power size, pipe diameter, system pressure and inlet temperature and so on. In general analysis the heating power is often regarded as a uniform distribution. The ANSYS-CFX numerical analysis software was used to analyze the flow heat transfer of supercritical water under different heating power distribution conditions. The distribution types of uniform, power increasing, power decreasing and sine function are investigated. Through the analysis, it can be concluded that different power distribution has a great influence on the flow of natural circulation if the total power of heating is constant. It was found that the peak flow of supercritical water natural circulation is maximal when the distribution of heating power is monotonically decreasing, minimal when it is monotonically increasing, and moderate at uniform or the sine type of heating. The simulation results further reveal the supercritical water under different heat transfer conditions on its flow characteristics. It can provide certain theory reference and system design for passive residual heat removal system about supercritical water.

• 한국가정과교육학회지
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• 제26권2호
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• pp.1-14
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• 2014

의복 폐기와 같은 환경문제의 해결방안과 가정 경제를 도울 수 있는 방안으로 재활용 교복 시장의 활성화에 대한 인식이 높아지고 있다. 따라서 본 연구에서는 청소년의 교복 재활용 실태와 청소년들의 친환경 소비의식, 소비행동, 소비가치가 교복 재활용 태도에 미치는 영향을 살펴보고 향후 교복 재활용 시장의 활성화를 위한 제언을 하고자 하였다. 이에 서울 경기 지역의 426명의 중 고등학교 여학생들을 대상으로 설문조사를 실시하였으며, 그 결과는 다음과 같다. 첫째, 청소년들의 60%이상이 교복 재활용 시장에 대해 찬성 의견을 보이고 있지만 실질적으로 재활용 교복 구매를 할 수 있는 기회가 적은 것으로 나타났다. 둘째, 청소년들의 친환경 소비의식, 소비행동, 소비가치는 재활용 교복에 대한 태도에 유의한 영향을 미치는 것으로 나타났다. 따라서 재활용 교복 시장 활성화를 위해서는 청소년들의 친환경 소비의식을 높이고, 친환경 소비행동을 할 수 있도록 가정교과와 타 교과 교육과의 연계를 통해 청소년들의 환경친화적 가치관 교육을 강화하여야 하며, 학교-학생-학부모 모두가 참여하는 실질적인 교복 재활용 기회의 확대가 필요하겠다.

• 대한가정학회지
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• 제43권5호
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• pp.235-248
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• 2005

The objective of the study was to design a Battle Dress Uniform(BDU with improved motional flexibility, body fit, and protectiveness to cope with the special operational environment of the subjects. For this purpose, the researcher conducted a questionnaire survey on 92 male members of Special Weapon Attack Team(SWAT units in a former study, and based on the results of the survey, made the two-piece and one- piece BDU samples to overcome the identified problems and inconveniences. The sample uniforms were designed ergonomically from five aspects. Subsequentlv, the new BDU was compared with the current operational uniform in terms of outward appearance(design and fit), motional flexibility, and suitability for field activities. The samples were evaluated by 5 SWAT members as subjects and 8 graduate school students majoring in clothing and textiles as experts. According to the results, the two-piece and one-piece samples gained higher scores than the existing operational uniform in terms of outward appearance(design and fitness) and motional flexibility, and the one-piece sample was preferred with regard to fit when worn by the subjects with their full kit for field operations. That is, the one-piece sample appeared to be more suited to the special work environment of SWAT and to be more functional in terms of ease of putting on and taking off, motional flexibility, body fit and protectiveness than the current operational uniform(two-piece type).

• 한국의상디자인학회지
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• 제21권4호
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• pp.97-113
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• 2019

Among the many factors affecting fashion trends, the concept of war has been particularly instrumental throughout human history. Specifically, military uniforms worn during the WWI and WWII became popular fashion styles that introduced military uniforms to modern fashion and continue to be influential to this day. And the fashion accessories market is continuously demanding new styles. The purpose of this study is to investigate the reasons why military uniforms have been continued to be influential in contemporary fashion, to apply fashionable features of military uniforms, and to make leather accessories by using leather-carving techniques. The characteristics of military uniforms were analyzed in advance research, domestic and international literature, and cases applied in modrern fashion collection. In conclusion, five modern fashion accessories were developed by combining the form, function, and decorative elements of the military uniform that have been constantly reflected in modern fashion with leather handcraft carving techniques. This study is meant to suggest the possibility of developing artistic and original fashion accessories that are both practical and reflect the history of military uniforms.

• 한국정밀공학회지
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• 제28권1호
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• pp.63-72
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• 2011

In recent years, hot-stamped components are more increasingly used in the automotive industry in order to reduce weight and to improve the strength of vehicles. In hot stamping process, blank is hot formed and press hardened in a tool. However, in hot stamping without cooling channel, temperature of the tool increases gradually in mass production thus cannot meet the critical cooling rate to obtain high strength over 1500MPa. Warpage occurs in the hot stamped component due to non-uniform stress state caused by unbalanced cooling. Therefore, tools should be uniformly as well as rapidly cooled down by the coolant which flows through cooling channel. In this paper, optimal design method of cooling channel to obtain uniform and high strength of the component is proposed. Optimized cooling channel is applied to the hot press V-bending process. As a result of measuring strength, hardness and microstructure of the hot formed parts, it is known that the design methodology of cooling channel is effective to the hot stamping process.

• 패션비즈니스
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• 제24권4호
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• pp.48-62
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• 2020

Originating in South Korea, Taekwondo has been globally popular among individuals who desire to improve their health in a unique fashion. The Taekwondo uniform, one of the essential factors within the sport, needs to possess both functionality and size suitability to support dynamic movements within Taekwondo. This study investigated the development of patterns in Taekwondo uniforms by suggesting patterns that reflect physical suitability derived from appearance tests and movement functionality tests of the uniforms. More specifically, we selected a sample uniform and conducted a dressing test, which considered both the aesthetics and the functionality of the garment. Then, we considered size suitability, which allowed us to design practical Taekwondo uniform patterns that encompassed more variation in body sizes of both men and women. The result of the dressing test was that women's uniforms typically required more factors compared to men's uniforms due to women's relatively smaller physiques. Based on this result, we revised the pattern to also encompass the minor differences in uniforms between men and women. In the end, the Taekwondo uniforms for women required more modifications than those for men.

• 한국자동차공학회논문집
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• 제20권1호
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• pp.124-130
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• 2012

An injection mold cooling circuit for an automotive front bumper was optimally designed in order to simultaneously minimize the average of the standard deviations of the temperature and the difference in mean temperatures of the upper and lower molds for uniform cooling. The temperature distribution for a specified design was evaluated by Moldflow Insight 2010, a commercial injection molding analysis tool. For efficient design, PIAnO (Process Integration, Automation and Optimization), a commercial PIDO tool, was used to integrate and automate injection molding analysis procedure. The weighted-sum method was used to handle the multi-objective optimization problem and PQRSM, a function-based sequential approximate optimizer equipped in PIAnO, to handle numerically noisy responses with respect to the variation of design variables. The optimal average of the standard deviations and difference in mean temperatures were found to be reduced by 9.2% and 56.52%, respectively, compared to the initial ones.

• 한국의상디자인학회지
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• 제9권1호
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• pp.149-159
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• 2007

With the help of the cooperative efforts made in the interdisciplinary studies among the different fields of computers, textiles and computer in the modem society based on knowledge-information, Smart Clothing, which is the combination of wearable Technology and clothing has been drawn. This study is to inspect the design of Smart school uniform, which if based on Wearable Technology, to meet the need for the PDG(Post Digital Generation) who want to require rapid and the convenient information. This study is aimed to quest for the direction of study in Wearable Technology through theoretical studies made in the field the Computer information communications Engineering, seminars in the field of Smart Textile and documentary study. In addition to them, this study is to search for the value for the school uniform in the PDG who are a group of potential consumers for the Smart Clothing, the environment in digitalized life and the need for the Wearable Technology. Based on this research, the concept of design reflecting the need for the characteristic and functions in the PDG was drawn and Design Prototype of Smart Jacket on the base of Wearable Technology was presented.

• Current Optics and Photonics
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• 제6권3호
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• pp.332-336
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• 2022

Given a cubic space, it is easy to uniformly illuminate the floor with light sources placed on top. However, little has been reported about uniform illumination on walls with the same configuration of light sources. Here we present a luminaire consisting of nine light-emitting diodes (LEDs) with perfect Lambertian distribution, placed on the top as a 3 × 3 rectangular LED array. The distances between LEDs and tilt angles of each individual LED are adjustable and optimized by an annealing algorithm. After optimization, the array produces a rectangular illumination pattern on one wall with a uniformity of about 89%. Analysis shows that the tilt angles of individual LEDs are key parameters for uniform side illumination. In a scenario that is more practical, the tilt angles of all the LEDs are set to be the same, only decreasing the uniformity to 83%.