• Proceedings of the KIEE Conference
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• 1999.11b
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• pp.361-363
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• 1999

This paper proposes an SSSC based on 3-level half-bridge inverters. The dynamic characteristic of the proposed SSSC was analyzed by EMTP simulation, assuming that the SSSC is inserted in the transmission line of the one-machine-infinite-bus power system. The proposed SSSC has six 3-level half-bridge inverters per phase, which operates in PWM mode. The proposed SSSC generates a quasi-sinusoidal output voltage by 90 degree phase shift to the line current. The proposed SSSC does not require the coupling transformer for voltage injection, and has a flexibility in operation voltage by increasing the number of series connection.

• Proceedings of the Korean Society of Embryo Transfer Conference
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• 2006.10a
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• pp.54-55
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• 2006

• Journal of Korean Society for Quality Management
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• v.43 no.4
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• pp.511-520
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• 2015

Purpose: This study suggests a method of risk assessment based on RAM analysis in order to reduce the subjectivity. Methods: RAM analysis is used to assessment risk consequence(RC) and risk likelihood(RL). Result: The calculated result of the product, which has higher risk assessment, shows lower MTBF system. Conclusion: Risk assessment based on objective database will provide objectivity and effective quality control.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.39.1-39.1
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• 2011

Due to less turbulence and no land limitation, offshore wind energy gets more attention than onshore. Jacket structure is regarded as a suitable solution for the water depth ranging from 30 to 80 meters. In general, joint stress concentration of jacket support structures affects their fatigue life. Nowadays, most jacket structures for offshore wind turbines have tubular X-joint between legs. In this paper, a study on X-joint stress concentration of offshore wind turbine jacket structure is performed by using 50m water depth model. Stress of X-joint on offshore environmental conditions are discussed.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.1127-1131
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• 2004

최근에 재해영향평가 등에서 많이 채택하고 있는 Huff의 4분위법에 의한 강우의 시간분포를 통한 유출량 산정은 도시화지역 등에서 유출량에 내한 관측기록이 없어서 적절한 검정이 불가능한 실정이다. 따라서 산정된 계획홍수량에 의해 설계되는 수공구조물의 경제성 또는 안전성의 정도를 파악하지 못하고 실무에 반영되는 문제를 내포하고 있다. 본 연구에서는 서울지역 최근 29개년간의 년 최대 강우관측자료에 대하여 각각을 Huff의 4분위법에 의한 10분 간격으로 시간분포고, 실제 관측 강우의 경우 10분 간격으로 판독하여 도시유출모형인 SWMM을 이용하여 유출량을 산정하고 결과를 비교하였다. 또한 각각에 대하여 유출량을 빈도해석하여 비교한 결과 강우의 시간분포간격이 짧은 경우 국내적용 Huff분포는 실강우분포에 의한 유출량보다 크게 산정되는 것으로 나타났다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2003.11a
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• pp.306-314
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• 2003

Engineered barrier test facility is specially designed to demonstrate the performance of engineered barrier system for the near-surface disposal facility under the domestic environmental conditions. Comprehensive measurement systems for the water content, temperature, matric potential are installed within each test cell. In this study, short-term monitoring of the behavior of multi-layered cover system is implemented with artificial rainfall system. The periodic measurement data are collected and analyzed by a dedicated database management system, and provide a basis for performance verification of the disposal cover design.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.971-973
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• 2010

선진국의 경우 무동력 수상 레저(Water leisure)분야에서는 카약(Kayak), 카누(Canoe)를 포함한 노 보트 종류가 가장 대중적인 상품으로 인식되고 있다. 특히, 국내의 경우 국민소득증가와 함께 보는 관광에서 체험관광으로 변화됨에 따라 수상레저상품에 대한 관심이 증가되고 있다. 또한, 한국은 2009년 말 해양레저활동이 가능한 마리나 사업을 발표함에 따라 수상레저참여인구의 폭발적 증가를 유도하고 있다. 한편, 국내 수상레저기구제작업체는 FRP 재료를 기반으로 하는 대량 생산 방법을 채택하고 있어 환경과 운영 및 관리에 어려움이 있어 새로운 재료를 이용한 제품에 대한 요구가 증가하고 있다. 본 연구에서는 수상레저기구중 가장 초보적인 제품인 카누를 친환경 소재를 이용하여 제작하고자 한다.

• Journal of Embryo Transfer
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• v.33 no.2
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• pp.55-59
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• 2018

Ensuring timely ovulation concerning the service is valuable. A satisfactory conception rate can be achieved by making sure that ovulation occurs within 7-18 hours after artificial insemination (AI). Delayed ovulation is one of the disturbances commonly encountered in repeat breeding animals. Although demanding research, many studies have not been conducted. Therefore, we aimed to examine the relation between ovulation confirmation and conception rate in dairy cattle. The research findings showed that the signs of true estrus were bred 12 hours after the onset of estrus by AI in cattle. Also, the performance of AI on ovulation was confirmed by the presence of fluctuant Graafian follicles through rectal palpation. From the results, we confirmed that cow encountered delayed ovulation were bred again. The Conception rate in cows with confirmed ovulation was 51.9%, while for those without confirmed ovulation were 33.3%. In conclusion, the results indicate that ovulation confirmation will likely increase conception rate.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.05a
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• pp.300-301
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• 2018

Construction industry is the biggest employer as a single sector, however, that needs better job quality and working conditions due to problems such as lack of job stability, aging worker, late disbursement of wages, and so on. In order to deal with fundamental issues of construction skilled worker's wages, this paper performs comparing the wage system of the construction industry in South Korea and the United States, and analyzes the characteristics about wage structure and determination. As a result of this study about U.S. case, it requires all stakeholder's exertions through technical competitiveness and management ability, not price war by reducing laborer's wages.

• The Korea Genome Conference
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• 2004.07a
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• pp.41.2-41.2
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• 2004