• 한국의류학회지
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• 제37권2호
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• pp.138-150
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• 2013

This study investigates changes in body size (as well as fit) before/after wear, according to the breast and brassiere type. To offer producers basic data on how to develop excellent brassieres, we accordingly conducted preliminary research on 183 20's women. The research revealed that breast-related size and fit change by about 10%; however, the upper length and inner length of breasts decreases. The fit of domed ones is the best and the fit of the elongated ones is the worst; subsequently, a closer representation of the ideal breast leads to a better fit to wear.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 Techno-Fair 및 추계학술대회 논문집 전기물성,응용부문
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• pp.73-74
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• 2008

This paper analyses current densities induced inside a worker using AC arc welder when he wear a protective with double shielding cloth. Applying the boundary element method, we calculate current densities induced in organs inside a worker in case he was located at 1[cm] far from a power cable of AC arc welder. As results of study, we fined aa protective cloth, which has high permeability in inner layer and high conductivity in outer layer, can give a higher shielding efficiency.

• 대한치과교정학회지
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• 제45권5호
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• pp.268-272
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• 2015

Clear thermoplastic retainers have been widely used in daily orthodontics; however, they have inherent limitations associated with thermoplastic polymer materials such as dimensional instability, low strength, and poor wear resistance. To solve these problems, we developed a new type of clear orthodontic retainer that incorporates multi-layer hybrid materials. It consists of three layers; an outer polyethylenterephthalate glycol modified (PETG) hard-type polymer, a middle thermoplastic polyurethane (TPU) soft-type polymer, and an inner reinforced resin core. The resin core improves wear resistance and mechanical strength, which prevent unwanted distortion of the bucco-palatal wall of the retainer. The TPU layer absorbs impact and the PETG layer has good formability, optical qualities, fatigue resistance, and dimensional stability, which contributes to increased support from the mandibular dentition, and helps maintain the archform. This new type of vacuum-formed retainer showed improved mechanical strength and rate of water absorption.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 춘계학술대회
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• pp.722-727
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• 2004

This paper includes the comparative study between Cr plating and nitriding process with an aim at improving corrosion, wear and maintainability for KNR(Korean Next Generation Rifle) 5.56mm barrel. The endurance test was conducted to compare the performance of standard barrel, Cr plating barrel and nitriding barrel. Main activities are described as follows; optimal Cr plating and nitriding process set-up for KNR 5.56mm barrel; durability test of each barrel(20,000 rounds); salt water immersion test; dispersion, initial velocity, inner diameter data acquisition. According to the results of this firing test, Cr plating barrel is superior to standard barrel and nitriding barrel in view of corrosion, wear and maintainability

• 한국군사과학기술학회지
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• 제7권1호
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• pp.5-12
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• 2004

This paper includes the comparative study between Cr plating and nitriding process with an aim at improving corrosion, wear and maintainability for KNR(Korean Next Generation Rifle) 5.5mm barrel. The endurance test was conducted to compare the performance of standard barrel, Cr plating barrel and nitriding barrel. Main activities are described as follows; optimal Cr plating and nitriding process set-up for KNR 5.56mm barrel; durability test of each barrel(20,000 rounds); salt water immersion test; dispersion, initial velocity, inner diameter data acquisition. According to the results of this firing test, Cr plating barrel is superior to standard barrel and nitriding barrel in view of corrosion, wear and maintainability.

• Tribology and Lubricants
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• 제27권5호
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• pp.269-274
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• 2011

The purpose of this paper is to study and analyze the improvement method for the failure examples including the vehicle brake system in actual field. It was verified that the indicator plate of pad wear scratched the brake disk because of wearing after displacement of non- identification parts pad. The caliper of other vehicle was installed with brake system verified the phenomenon produced groove in center point because of one side wear when the pad was not fully contacted with the rub disk by other action surface pressure and pad action condition. It verified that the crack phenomenon fatigue was produced by brake thermal deformation because of decreasing the thickness by grinding to modify the non-uniformed wear of brake disk. It verified that the friction sound was produced by the friction phenomenon because of non-uniformed contact of lining and an alien substance with inner of the drum and lining braking by crack phenomenon with brake drum surface.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.33-36
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• 2007

The majority of fly ash pipes in thermal power stations use steel pipes. This makes frequent replacement inevitable due to severe abrasion near the hot and curved section of pipes. Recently, there have been efforts to prevent this abrasion with lining techniques using ceramic or basalt on the inner wall of the pipe. This study uses composite and anti-wear material to maximize the anti-abrasion effects on the hot section of the pipe. The thickness of the abrasion layer was determined by the abrasion ratio of material found through the experiment; the thickness of the reinforcement layer was determined by micromechanics. Experiments were conducted on epoxy resins to test for heat and abrasion. Anti-abrasion test using particle impingement was intended to recreate realistic conditions when abrasion occurs within the hot section of an actual pipe. This study analyzes the abrasion ratio obtained from both the specimen experiment and from on-site measurement and provides evidence that a combination of composites and anti-wear agent can be used to create a fly ash pipe that is lower in costs and higher in quality than what is used currently.

• Tribology and Lubricants
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• 제33권4호
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• pp.141-147
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• 2017

The vibration data of bearings are very useful for monitoring and determining the condition of the bearings. The defect frequencies of ball bearings have been used for monitoring there condition. However, it is not easy to verify the defect frequencies as the wear progress. Therefore there is a need for an easy method to monitor the damages of bearings in real-time and to observe the variations in vibration characteristics as the wear progress. In this study, a bearing test equipment is constructed to diagnose the damage of bearings. The friction coefficient and vibration data are measured by using a torque sensor and an acceleration sensor, and the correlation between the measured data is analyzed to diagnose the condition of the bearing. We reached the following conclusions from the results. When the ball surface, inner and outer rings of a ball bearing are damaged, the friction coefficient increases to over 0.02 with an adhesion on the surface. Moreover this damage occurs more quickly with an increase in the number of revolutions. In the vibration characteristics, the amplitude of vibration wave appears high with an increase in the friction coefficient. In the high frequency range between 1000 and 2000 Hz, a wide range of frequency components with high amplitude occurs continuously irrespective of the number of revolutions.

• 한국산학기술학회논문지
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• 제19권1호
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• pp.188-198
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• 2018

영아복 업계는 환경오염 등의 이유로 대두된 아토피성 피부의 심각성을 고려하여 이를 해결할 수 있는 기능성 제품들을 출시하고 있다. 미국과 일본 등은 다양한 방법으로 친환경을 준비해온 대표적인 나라들이며 우리나라에 비해 오가닉 코튼을 이용한 영아복 브랜드의 시장이 크고 색상과 디자인 또한 다양하다. 따라서 본 연구는 오가닉 코튼을 사용하는 한국의 영아복 브랜드와 미국의 영아복 브랜드의 제품 및 칼라를 비교 분석하고자 한다. 오가닉 대표 브랜드는 한국 3개와 미국 4개의 오가닉 제품 브랜드이고 총 331개 제품의 디자인과 컬러를 웹상으로 조사하였다. 비교 분석한 결과는 용도별 디자인에 있어서는 미국 오가닉 브랜드가 한국 오가닉 브랜드보다 제품의 다양성이 더 많았다. 컬러분석은 한국 오가닉 브랜드는 내츄럴한 코튼컬러인 Y와 G계열로 집중되어 있는 반면 미국 오가닉 브랜드는 원색에 가까운 폭넓은 컬러 군으로 분포되어 있는 것을 알 수 있다. 따라서, 오가닉 코튼을 이용한 한국의 영아복 브랜드는 좀 더 다양한 디자인과 섬세하고 폭넓은 색상이 요구된다.

• 한국산학기술학회논문지
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• 제15권2호
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• pp.678-687
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• 2014

아기들의 피부는 매우 연약하고 환경 적응력이 아직 부족하기 때문에 화학약품 등에 의해 피부염을 유발할 가능성이 매우 높다. 또한 겉옷과 내의를 같은 기능으로 사용하는 영아복에 있어서 오가닉(유기농) 코튼은 가장 적합한 섬유라고 할 수 있다. 따라서 본 연구는 오가닉 코튼을 사용하는 국내의 영아복 브랜드와 일본의 영아복 브랜드의 제품 및 칼라 분석을 하고자 한다. 6개의 영유아 오가닉 대표 브랜드는 국내 3개와 일본 3개의 브랜드이고 총 213개 제품의 디자인과 컬러를 웹상으로 조사하였다. 비교 분석한 결과는 용도별 디자인에 있어서는 국내브랜드보다 일본브랜드가 더 많았다. 컬러분석은 모두 내츄럴한 코튼컬러를 선호하며 비교적 YR 계열이 많은 공통점이 있으나 일본의 경우 색상들이 비교적 폭넓게 분포하고 있는 반면 국내 브랜드는 비교적 폭이 좁게 나타났다.