• 한국기계가공학회지
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• 제14권6호
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• pp.21-26
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• 2015

This study presents a development of the cleaning system in a nuclear power plant condenser. The tube cleaning system is very important equipment in a power plant condenser. Specially, removal of the fouling is a key process in the condenser tube. The objective of this study is development of a ball collector system for cleaning a condenser by using a sponge ball. This study uses CFD in order to optimize design of the ball strainer screen. Through the CFD, the implication of the ball strainer screen for static pressure distribution is examined. Results of research, this study have developed a 1/5 scale model for application to the power plant and developed a performance test equipment.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 춘계 학술논문 발표대회
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• pp.169-171
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• 2012

Although work-efficiency of construction machinery is a critical factor for estimating its workable-quantity per unit time, the coefficient figure table presented in the Poom-Sam that is used for Construction Cost Estimation of public sectors in Korea is very subjective for practical usage. In order to suggest objective work-coefficient table for a Tub Grinder, domestic and overseas documentary records were investigated and on-going construction sites were also visited. The research found that the table can be revised by means of detailing down by several factors. The research will be the foundation for applying the rapid development of Construction Equipment and technology to the appropriate cost estimations and the ground work of related studies.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.184-190
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• 2009

Recently, the concern for the reliability of railway is increasing, also the study about reliability is being processed at a good pace. However, in case of an existing railway operating it is true that the railway system is being operated without a clear RAM standard. There is not a clear RAM standard about product menual of a city railroad, and there are only basic provisions concerning traction motor which can be called a main equipment. In this paper, we calculated the availability and reliability of subway having MKBSF, MKBF, MTBF, MTTR analyzing accumulated maintenance data about a main equipment of a VVVF direct subway being operated in line #4. By watching the reliability grade of a VVVF subway being operated and manufactured within the country and being applied with the development of a city railway reflected by RAM menual when the new subway is manufactured, and with the basic data of RCM, we'd like to grope the methods which can be improved by operation stability of a city railway.

• 복식문화연구
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• 제24권2호
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• pp.150-165
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• 2016

With signs of the redevelopment of the domestic sewing industry, national support agencies were established. This study aims to assess the present conditions of the domestic sewing industry and investigate the effectiveness of national sewing industry support policies. According to the results of a survey of 30 sewing companies managers, the biggest factor causing product defects was work being rushed because of tight delivery dates, and the reduction in sales was caused by a lack of orders. Moreover, sewing technicians are aging, and the biggest reason for their decrease in number is that people do not pursue the job because of the common understanding that it is difficult. Managers perceived that the government's sewing technician training program was not a practical help. They were well aware of the support program to improve the work environment and the sewing equipment support program and showed high satisfaction with these programs, but they complained that the period for equipment rental was fixed. A majority of them thought that the Korean sewing industry environment had still not improved, and were skeptical about its future outlook. They identified its most urgent needs as the expansion of orders and the securing of manpower. The support programs that they wanted urgently included support for employees' four major public insurances and the enactment of the increase of toll processing fees.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.372-382
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• 2006

The DCM(Deep Cement Mixing) Method was introduced domestically in 1985 and has been applied widely to improve stability, increase bearing capacity and reduce settlement of the structure. It has been only performed by the combined equipment to improve the soft ground in coastal areas. But it has qualify-control problems such as interference of waves and improving depth, etc. Therefore DCM Barge of specialist equipment, named by Dong Ji Ho, was equipped with three mixing shafts with four rod and installed GPS system In itself, had been developed in 2005 for the purpose of solving the above problems. This paper represents about Dong Ji Ho's qualify-control system as well as it's first domestic application to in-situ trial test and the original design of the Ulsan breakwater site.

• 한국자동차공학회논문집
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• 제11권5호
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• pp.50-59
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• 2003

It was known that high pressure injection is an effective method to enhance thermal efficiency and decrease exhaust emissions in diesel engines. If injection pressure becomes ultra high, it is predicted that there may be a suitable injection pressure which the enhancement rate of spray characteristics is moderate. Also, there may be a limit injection pressure which spray characteristics is reversed and get worse. But these are unknown. To investigate a suitable injection pressure and a limit injection pressure, ultra high pressure injection equipment(UHPIE), which can realize the injection pressure of 3,200bar, was developed. UHPIE is a basic apparatus of single shot injection, and ultra high pressure was achieved by second stage rapid compression in short time. From the evaluation of UHPIE, a injection curve like a conventional diesel engine(jerk type) was realized. Also, it was proved that repetition of experiment was excellent. Therefore it was found that there was no problem to perform the study on the ultra high pressure injection with UHPIE. Consequently, the foundation of the study on ultra high pressure injection could be established.

• 한국BIM학회 논문집
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• 제10권4호
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• pp.70-80
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• 2020

In the MEP(Mechanical Electrical and Plumbing) field, the utilization of BIM-based drawings is lower than in the architectural and structural sectors, and the limited BIM collaboration problem caused by different levels of BIM utilization in each field is becoming a serious problem in adoption and utilizing BIM. Therefore, this study analyzed the current status of BIM application in the field of mechanical equipment in the construction industry and analyzed the practical problems and limitations of adoption and utilizing BIM from a corporate perspective based on Delphi analysis techniques. Based on the results of the analysis, the limitations of the current MEP BIM application were classified into economic, technical, institutional, and social factors to derive detailed items, and, accordingly, the improvement measures were classified as institutional, policy, and technical measures. As a result, the company intends to maximize the value of BIM utilization in the MEP field by presenting improvement plans to activate BIM in the field of mechanical equipment based on the opinions of the company, thereby laying the foundation for BIM in the construction industry by creating a collaborative BIM environment for each sector in the domestic construction industry.

• 한국응용과학기술학회지
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• 제40권6호
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• pp.1580-1588
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• 2023

피부가 맑고 깨끗하기를 바라는 것은 남녀 모두가 원하는 바이며 여성들은 피부를 아름답고 투명한 피부를 위해 파운데이션의 도움을 받는다. 파운데이션은 백인이라 밝은 색을, 동양 인이라 중간색을, 흑인이라 어두운색을 사용하는 것이 아닌 인종의 피부와 상관없이 개인의 피부색과 피부톤에 따른 차이로 파운데이션 선택이 이루어진다고 판단된다. 따라서 인종차별에 따른 파운데이션 색상 사용의 고정관념을 뛰어넘어야 할 필요성이 요구된다. 이에 이 연구의 목적은 각각의 촬영과 환경 그리고 장비에 영향받은 한국, 중국, 일본, 미국, 프랑스, 영국의 화장품 브랜드를 임의로 선정하고 웹사이트에 등장하는 파운데이션 광고 모델 이미지에 따른 피부톤의 차이를 파악하는 데 목적이 있다. 브랜드별 RGB로 파운데이션의 색상 값을 분석해 본 결과 한국의 경우 8.75R, 1.25YR, 2.5YR, 3.75YR, 5YR, 6.25YR로나타났으며 중국 브랜드는 2.5YR, 3.75YR, 5YR, 6.25YR, 10YR로 한국과 유사함을 알 수 있다. 일본의 브랜드는 7.5R, 8.75R, 10R, 5YR, 6.25YR, 7.5YR로 나타났으며, 미국의 브랜드는 6.25R, 8.75R, 10R, 2.5YR, 3.75YR, 5YR, 6.25YR, 7.5YR, 10YR로 나타났다. 프랑스 브랜드는 10R, 1.25YR, 3.75YR, 5YR로 나타 났으며, 영국 브랜드는 2.5YR, 3.75YR, 7.5YR로 YR색상 분포를 보이고 있다. 후속 연구로는 시대에 따른 파운데이션의 재형 및 색상변화에 관한 연구가 깊이 있게 이루어지길 바라며 이 연구가 화장품 회사의 마케팅에 필요한 기초자료 및 전략 수립에 활용되어 국내·외 색조 화장품 시장의 발전에 기여하길 기대해 본다.

• 한국지진공학회논문집
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• 제11권3호
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• pp.63-72
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• 2007

비상디젤발전기는 원전의 안전성에 큰 영향을 미치는 매우 중요한 기기이다. 본 연구에서는 세 종류의 비상디젤발전기를 대상으로 가동중 진동을 계측하여 기초시스템에 따른 가동중 진동의 저감효과를 비교하였다. 대상 원전은 영광 5호기, 울진 2호기 및 울진 3호기 원전의 비상디젤발전기로 하였다. 영광 5호기와 울진 3호기의 비상디젤발전기는 동일한 종류의 비상디젤발전기로서 기초형식만 앵커볼트 고정과 스프링-댐퍼시스템을 이용한 면진으로 구분된다. 울진 2호기 비상디젤발전기는 기초부분에 seismic block을 설치하고 코일스프링을 이용하여 진동저감효과를 고려하였으므로 좋은 비교가 될 것이다. 이러한 진동계측의 목적은 기초형태에 따른 진동저감 효과를 비교해 보기 위함이다. 결과적으로 스프링-댐퍼 시스템이 진동저감과 시스템의 안정적 거동측면에서 좋은 효과를 보이고 있음을 알 수 있었다.

• 대한의용생체공학회:의공학회지
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• 제42권3호
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• pp.125-142
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• 2021

The POCT (point-of-care test) sensing that has been a fast-developing field is expected to be a next generation technology in health care. The POCT sensors for the detection of proteins, small molecules and especially nucleic acids have lately attracted considerable attention. According to the World Health Organization (WHO), the POCT methods are required to follow the ASSURED guidelines (Affordable, Sensitive, Specific, User- friendly, Robust and rapid, Equipment-free, Deliverable to all people who need the test). Recently, several CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) based diagnostic techniques using the sensitive gene recognition function of CRISPR have been reported. CRISPR/Cas (Cas, CRISPR associated protein) systems based detection technology is the most innovative gene analysis technology that is following the ASSURED guidelines. It is being re-emerged as a powerful diagnostic tool that can detect nucleic acids due to its characteristics that enable rapid, sensitive and specific analyses of nucleic acid. The first CRISPR-based diagnosis begins with the discovery of the additional function of Cas13a. The enzymatic cleavage occurs when the conjugate of Cas protein and CRISPR RNA (crRNA) detect a specific complementary sequence of the target sequence. Enzymatic cleavage occurs on not only the target sequence, but also all surrounding non-target single-stranded RNAs. This discovery was immediately utilized as a biosensor, and numerous sensor studies using CRISPR have been reported since then. In this review, the concept of CRISPR, the characteristics of the Cas protein required for CRISPR diagnosis, the current research trends of CRISPR diagnostic technology, and some aspects to be improved in the future are covered.