• 한국자기학회:학술대회 개요집
• /
• 한국자기학회 2007년도 The 1st International Symposium on Advanced Magnetic Materials
• /
• pp.71.1-71.1
• /
• 2007

• 한국유체기계학회 논문집
• /
• 제16권5호
• /
• pp.18-23
• /
• 2013

Thermal aging test is performed to qualify the life time of equipment in thermally aged condition. Due to long life time more than 10 years like as in power plant, the equipment is subjected to the accelerated thermal aging condition which is able to shorten the long aging test period by increasing aging temperature. Normally, conservatism of thermal aging test causes to impose unbalanced and excessive thermal load on components of the equipment, and deformation and damage problems of the components. Additionally, temperature rise of each component through heat generation of the electric equipment leads to long-term problem of the test period. Multi-phase accelerating aging test is to perform thermal aging test in multiple aging conditions after dividing into groups with various components of equipment. The groups might be classified considering various factors such as activation energy, temperature rise, glass transition temperature and melting temperature. In this study, we verify that the multi-phase accelerating aging test method can reduce and equalize the thermal over load of the components and shorten aging test time.

• Geomechanics and Engineering
• /
• 제32권5호
• /
• pp.463-474
• /
• 2023

Materials produced with the help of new technology are used in the design of materials used in all science and engineering departments today. A sports engineering and sports equipment department is one of these departments. The use of nanotechnology in sports equipment is one of the most popular uses of this technology today. Nanomaterials have been used in sports equipment for many years, and reputable companies have benefited. Athletes' equipment allows them to display their skills to the fullest extent. It has always been a dream of professional athletes and their coaches to have unique equipment. As a result, engineers have spent all their time and effort solving this problem. Science and engineering can do various things to meet the needs of all sports levels, including specific and detailed designs, the use of appropriate materials, and standardization tests on equipment. However, these aspects must remain aligned with the latest technologies as they develop, just as with other sciences. These technologies, especially nanotechnology, are essential to sports equipment and devices developed today by sports engineers. This article examines the balls that use nanotechnology and can also improve the athlete's performance by using this technology in a specific structure. Using nanotechnology to make nanocomposite poly-hope balls, which makes them lighter and more acceptable, reduces the impact on the ball and increases its movement speed.

• 한국재료학회지
• /
• 제29권11호
• /
• pp.670-676
• /
• 2019

We study substrate support structures and materials to improve uptime and shorten preventive maintenance cycles for chemical vapor deposition equipment. In order to improve the rolling of the substrate support, the bushing device adopts a ball transfer method in which a large ball and a small ball are mixed. When the main transfer ball of the bushing part of the substrate support contacts the substrate support, the small ball also rotates simultaneously with the rotation of the main ball, minimizing the resistance that can be generated during the vertical movement of the substrate support. As a result of the improvement, the glass substrate breakage rate is reduced by more than 90 ~ 95 %, and the equipment preventive maintenance and board support replacement cycles are extended four times or more, from once a month to more than four months, and the equipment uptime is at least 15 % improved. This study proposes an optimization method for substrate support structure and material improvement of chemical vapor deposition equipment.

• 한국정보통신학회논문지
• /
• 제24권1호
• /
• pp.134-137
• /
• 2020

Recently, there are emphasized to support the maintenance and management system of vessels using acquired data from engine part equipment. But, there are limitations for data exchange and management. To solve the problem, the ISO published ISO 19847 and 19848. In this paper, we analyze the ISO 19848 requirements related to identify data channel ID for ship equipment, and propose the examples for applying encoding techniques. In addition, we suggest the proposed technique for applying of managing the failure and maintenance type of the ship's engine part facilities by examples. If this method is applied, the vessel's equipment can exchange data through the sharing of the code table, and express what response is needed or acted, including where the failure occurred.

• 소성∙가공
• /
• 제17권1호
• /
• pp.5-8
• /
• 2008

As the semi-solid forming technology has a lot of advantages compared to the die casting, squeeze casting and hot/cold forging, it has been studied actively. This paper focuses on the thixoforging of the rheological materials fabricated by the spiral mechanical stirring equipment with A356 casting aluminum alloy and A6061 wrought aluminum alloy. Formability tests of rheological materials fabricated by spiral mechanical stirring were carried out and the microstructures of forged sample were observed. After thixoforging experiment, the heat-treated conditions of forged samples are investigated to improve the mechanical properties. These results are able to suggest the possibility of commercialization for rheological materials fabricated by spiral mechanical stirring.

• 전자통신동향분석
• /
• 제36권4호
• /
• pp.110-117
• /
• 2021

The development of core technologies in the 4th Industrial Revolution, such as artificial intelligence, big data, and the intelligent Internet of Things, promote digital transformation and intelligence of the manufacturing industry. To realize them, there is an increasing demand for materials, components, and equipment needed for final goods. In particular, the expansion of global value chain instability due to changes in the external environment, such as the U.S.-China trade dispute, Japan's export regulations, and Covid-19 pandemic, increases the importance of strengthening the materials, components, and equipment industry in the global market. Thus, this study presents a strategic direction for securing global industrial competitiveness of materials, components, and equipment using Michael Porter's diamond model approach.

• 한국산학기술학회논문지
• /
• 제17권7호
• /
• pp.92-102
• /
• 2016

본 연구는 국내 외 가설기자재 관련 제도 및 기준 등을 비교 분석하여 가설기자재 안전인증제도 개선방안을 제시하며 건설 산업에서 사용 중인 가설기자재의 안전성을 확보하고자 한다. 현재 사용되는 가설기자재 안전인증제도 이행실태를 파악하기 위하여 생산 임대 사용의 가설기자재 관련 종사자에 대해 인터넷 설문조사 및 현장방문 인터뷰를 실시하여 통계분석을 수행하고 안전인증제도 실태조사 및 개선방안을 제시하였다. 안전인증제도는 2009년부터 시행되고 있지만 한국산업안전보건공단의 '건설중대재해 사례와 대책'을 확인하면 건설재해는 매년 증가하는 추세이다. 가설기자재 관련 종사자의 안전인증품목 적절성에 대한 응답은 '예(36%)', '아니오(30%)', '잘 모르겠음(35%)'으로 현행 안전인증제도 적합성에 대한 긍정적인 응답률이 절반에도 미치지 못하는 것을 알 수 있다. 현재의 가설기자재 안전인증제도는 건설 환경의 변화를 따라가지 못하고 있다는 의견이 많았다. 또한 국외 가설기자재 및 신소재 신제품에 대한 인증 방안 모색과 재사용가설기자재 자율등록제 제도 보완 및 안전성 증대 방안이 필요할 것으로 나타난다. 본 연구를 통하여 현행 안전인증제도의 인증대상 품목, 인증규격의 현실 적합성 및 인증방법 등을 검토한 후 안전인증제도 개선방향을 제시 하였다.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2011년도 춘계학술대회 논문집
• /
• pp.1129-1130
• /
• 2011

• 한국복합재료학회:학술대회논문집
• /
• 한국복합재료학회 2001년도 추계학술발표대회 논문집
• /
• pp.39-42
• /
• 2001

This paper addresses the development of VP curing equipment for the substitution of autoclave which has several limits in application. This equipment adopt vacuuming and pressurizing processes similarly to the autoclave, but has flexible pressurizing and movable system. The experiments were pursued to determine and to compare specific properties of the specimens produced by three kinds of processes; autoclave, hotpress, and VP. The results show that the VP curing equipment can produce the useful composite material with a little inferior quality to the autoclave, but better than the hotpress. Considering the movability of VP curing equipment, it can be expanded its application to the areas of composite patch-repaired structure in large objects.