• 유공압시스템학회논문집
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• 제2권4호
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• pp.14-22
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• 2005

The safety factor of hydraulic piston pumps & motors due to high pressurization, high speedization and low weight/volume realization to enhance the output density shows a tendency to decrease. Therefore more effective test methods are necessary to predict the exact life. The failure of hydraulic pumps & motors operating in high pressure and high speed mainly occurs in piston-shoe assemblies, and the major failure mode is wearout of the shoe surface. The sensitive parameters in the endurance life test are speed, pressure and temperature, and the failure production increases in proportion to the operating time. In this research, the authors propose the combined accelerated life test model using the analysis method of the combined accelerated life test results of piston-shoe assemblies by applying simultaneously high speed, high pressure and high temperature in accordance with variation of speed, pressure and temperature to reduce the life test time.

• 동아시아경상학회지
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• 제10권4호
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• pp.75-90
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• 2022

Purpose - This study aims to study the activation pattern of declining industries by applying the Gompertz growth model using available resources based on the theory of industrial life cycle, classifying declining industries among Korean manufacturing industries, and identifying resource input characteristics. Research design and methodology - This study was conducted by combining the Gompertz growth model that predicts the limit of output based on available resources under the industrial life cycle theory. Using Gompertz model, this study analyzed the life cycle of 39 Korean manufacturing industries from the perspective of domestic production, number of employees, and fixed assets Results - According to a life cycle analysis of 39 manufacturing industries in Korea, the computer, textile, and shoe industries were classified as declining industries. Among them, research on resource input characteristics on the shoe industry showed that domestic production and the number of employees decreased, while the proportion of domestic R&D personnel and the number of research departments gradually increased. Conclusion - Among the declining industries in Korea, the shoe industry is considered to revitalize the industry, that is, to extend the life of the declining industry by offshoring its production site and improving constitution with a "R&D center for global" support.

• The Journal of Korean Physical Therapy
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• 제16권2호
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• pp.116-127
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• 2004

The purpose of this study was to determine the effect of shoe lift of the affected limb in subjects with hemiplegia. The subjects of this study were 18 post-stroke hemiplegics. For the study, insole of the paretic side was lifted 10 mm higher, and static weight bearing was measured before and after the lift application. For the measurement of carry-over effect of lift, we got data of those three items prior to and 3 weeks after lift application and 3 days after removal of the lift. Static weight bearing was significantly increased both just after and continuous application of lift for 3 weeks than before. According to this study, lift applied to the shoe of the paretic limb was effective in inducing static weight bearing in the paretic limb. This study suggests that symmetry, induced by shoe lift applied to the paretic limb, could help correct abnormal posture that would be caused in standing and prevent development of abnormal muscle tone in subjects with hemiplegia caused by unilateral stroke.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2006년도 학술발표대회 논문집
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• pp.116-125
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• 2006

Piston assemblies, which are key components of hydraulic high pressure pumps & motors, are major failure products operating at high pressure and high speed, and the main failure mode is wearout of the shoe surface. To predict the actual life of piston assemblies. we require to find out the most sensitive parameters and establish related empirical formula. In this study, we analyzed the life of piston and shoe assemblies in accordance with variation of speed, pressure, and temperature to reduce the life test time, then analyzed the result of combined accelerated life test which is applied by high speed, speed pressure, and high temperature simultaneously, and finally developed combined accelerated life test model.

• 한국기계가공학회지
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• 제21권9호
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• pp.110-116
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• 2022

As the spread of COVID-19 continues, cleanliness and quarantine are emphasized in daily life. If foreign substances enter through the shoe sole when using public facilities, cleanliness may deteriorate and various infections may occur. To prevent this, shoe sole cleaners that filter out foreign substances have been developed. In this study, a design that satisfies structural safety was presented by selecting a new material and updating the design parameter to reduce the weight of the shoe sole cleaner. To evaluate the structural safety, a finite element analysis under selected design loads was performed. Through design improvement and stress analysis, a model that was approximately 85% lighter than the existing model was developed.

• 유공압시스템학회논문집
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• 제7권3호
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• pp.7-12
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• 2010

In the case of hydraulic piston motor, hydrostatic bearing is designed to be adapted the hydrostatic bearing for the relative lubrication in the structural design. It's available to make it highly efficient and that's why it's widely used. The thing which largely influence the high pressure, the high efficiency, and the life is the hydrostatic bearing between a shoe and a swash plate. In this study, with the most general "hydrostatic bearing shoe" that has one recess as the subject of this research, I designed and made the 4 kind of piston shoe that have different orifice diameter each other, and studied the features of the hydrostatic bearing by observing the change of the leakage flow rate, the torque and the volumetric efficiency through experiments on the changes of the pressure & the speed of the revolution. As a result, the bigger diameter of the orifice, the less torque. And with an increase of the orifice diameter under the high pressure, the leakage flow rate decreased remarkably. Also it was observed the leakage flow rate increased linearly according to the increase of the supply pressure.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 춘계학술대회
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• pp.411-412
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• 2022

최근 들어 잘못된 보행 습관과 신발 착용으로 족부 질환자들이 늘어나고 있다. 신발의 발달과 생활환경으로 누구나 족부질환으로부터 안심할 수 없다. 족부질환 환자가 정형 신발 구매시 신발디자인 특성이 만족도와 구매 의도에 어떠한 영향을 미치는지 연구한다. 신발 디자인 특성은 기능성, 편의성, 심미성으로 구성하였다. 사회활동 참여 빈도, 착용 목적, 족부 질환별 상태와 특징 등 다양한 관점에서 연구된다. 연구 결과를 통해 정형 경증 족부질환 환자들이 일상생활에서 유용하게 착용할 수 있는 정형 신발 디자인 개발과 현실적인 활용과 만족으로 이어지길 기대한다.

• 복식
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• 제54권4호
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• pp.85-95
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• 2004

The Purpose of this study was to find a phase of clothing in Korean proverb. The results of the analysis of this research was as follows： In the case of headgear, was expose that symbolize handsomeness, conduct of life, personality that display charm and position which is not usage as only head protection. Upper wear was expressing aspect and person's similarity, and was symbolizing conduct of life by meaning of dress and its ornaments according to a person that dress displays that change. Trousers(bottom wear) was expose that it means aspect or conduct of life(a 4 case, 40％) through site. Overcoat showed that overcoat that is clothes that is symbolizing wearer's situation, aspect and wear most on face because is involved with behavior that is not right in clothes usage is used by standard that foretell personality. Underwear can know that expressed being involved with right behavior, nature by the basic clothes. I was able to know that I express an attitude of a life or a form through shoe, and the accessories won an minor order but that I have a large influence on a character or the appearance of a person. Silk fabrics expresses Position, and hemp cloth expressed by symbol that display ability. Also, silk fabrics had meaning that hint person's background. Dress and its ornaments that is used in proverb by these result can know that have function as symbolic symbol that display Person's nature or situation, aspect that is wearing clothes that is not function as only simple clothes.

• 한국정보통신학회논문지
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• 제26권7호
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• pp.1019-1025
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• 2022

최근 들어 잘못된 보행 습관과 생활환경으로 인한 족부 질환자들이 늘어나고 있다. 신발디자인 특성에 따른 경증 족부질환 환자가 정형 신발 구매시 만족도와 구매 의도에 어떠한 영향을 미치는지 살펴본다. 신발 디자인 특성은 기능성, 편의성, 심미성으로 구성하였다. 심미성이 정형 신발 구매 시 영향을 미치는 것으로 나타났다. 기능성과 편의성의 요소가 영향이 적더라도 심미성이 높다면 구매의도와 만족도에 영향을 준다. 경증 족부질환별 사회활동 참여 빈도와 착용 목적에 따라 디자인 또한 다양한 요소들이 요구된다. 연구 결과를 통해 알아본 정형 신발디자인 특성 요인을 더욱 보완하여 경증 족부질환 환자들이 일상생활에서 착용할 수 있는 유용한 정형 신발 디자인 개발과 현실적인 활용과 만족으로 이어지길 기대한다.

• Journal of Electrical Engineering and Technology
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• 제11권5호
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• pp.1210-1215
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• 2016