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CICC 형태의 초전도 버스 선에서 냉각 및 자기장에 의한 응력 해석
이호진,남현일,김기백,홍계원,Lee, Ho-Jin,Nam, Hyeon-Il,Kim, Gi-Baek,Hong, Gye-Won 한국초전도저온공학회 2000 한국초전도저온공학회논문지 Vol.2 No.2
A CICC type superconducting bus-line electrically connecting a superconducting magnet to a power supply is cooled down to low temperature under the external magnetic field during operation. The thermal contraction during the cooling may be constrained by the supports which are installed to protect the bus-line from Lorenz magnetic forces. This constrained contraction causes thermal stresses in the bus-line to release thermal contraction. The minimum stress conditions in the bus-line may be optimized by controlling the supporting arrangement considering the thermal contraction and the external field. The analytical method to find optimal supports arrangement was suggested by using the beam theory, and numerical calculation using commercial code was performed to verify the suggested analytical optimization method.
이호진,오현식,Lee, Ho Jin,Oh, Hyoun Sik 한국방재안전학회 2018 한국방재안전학회 논문집 Vol.11 No.2
세굴보호방법은 두 가지 형태로 구분할 수 있다. 첫 번째 방법은 국부세굴의 주요 원인인 말굽형와류와 후류와를 감소시키는 방법이다. 소형 원통형구조물 또는 분리된 연직반사판은 교각 앞에 설치하거나 스포일러처럼 교각에 부착하여 와류의 세기를 감소시킬 수 있다. 두 번째 방법은 하상재료를 보호하기 위한 보호층을 설치하는 방법이다. 이 방법은 블록매트 또는 테트라포드를 사용함으로써 즉시 효과를 발휘하는 장점이 있다. 본 연구에서는 첫 번째 방법을 사용하여 세굴감소 효과를 평가하였다. 반사판 간격과 세굴의 감소효과의 관계는 명확하게 나타나지 않았다. 이 것은 반사판의 폭이 세굴 감소와 어느 정도 관계가 있기 때문인 것으로 추측된다. KC 수가 증가함에 따라, 세굴감소 효과는 줄어드는 경향을 보였다. 또한, 세굴감소율은 $U_R=25$ 또는 KC = 8 일 때 급격한 변화를 보였다. Scour protection methods can be categorized as two types: The first is to reduce the horseshoe and wake vortices which are the main reasons for local scour. Either small cylindrical structures or separated vertical deflectors can be placed in front of the pier or the horizontal deflector (or collar) can be attached to the pier like the spoiler to reduce the dynamics of vortical structures. The second is to employ the protection layer to keep the bed material in place, which is a common method with a merit of immediate effect by using block mat or tetrapod. This study examined the effect of scour reduction using the former method. The relationship between the reflector interval and reduction of scour was not clear. It is assumed that the width of the reflector is somewhat correlated with the reduction of the scour. As the KC numbers increases, the Effect of Scour reduction rate is shown to decrease. Also, Scour reduction rate showed a rapid change at $U_R=25$ or KC = 8.
이호진,김준호,임준성,강덕근,Lee, Ho-Jin,Kim, J.H.,Lim, J.S.,Kang, D.G. 통신위성우주산업연구회 2000 Joint Conference on Satellite Communications Vol.2000 No.-
국내에서도 위성전파 자을 효율적으로 그리고 경제적으로 활용하고 또한 구구내 위성통신망을 외부의 간섭으로부터 보호하기 위하여 자체적인 위성 전파 감시시스템 개발을 착수하였다. 이 시스템 개발계획은 1998년부터 시작되었으며, 금년 6월부터 개발에 착수하게 되었다. 2년간의 개발을 거쳐 서울 근교의 이천에 감시센터가 건립될 예정이다. 정보통신부와 중앙전파관리소가 주체가 되어 국내에 확보된 기술을 활용하여 국내 독자적으로 개발에 착수하였으며 현재 시스템 설계가 완료된 상태에 있다. 본 논문에서는 시스템에 대한 전반적인 개요와 구조설계에 대해서 소개를 한다. 또한 시스템의 기능과 성능, 용량에 대해서 분석하며 각각의 주요 기능에 대해 언급하였다. Motivated by the satellite radio monitoring systems built and operated by some countries, MIC of Korea has launched the development of its own satellite monitoring system to ensure efficient and economical use of radio frequency spectrum as well as to protect domestic satellite communications. The system development contract was awarded in June this year and is scheduled to be activated after two year's implementation at the site south to Seoul. Korean expertise of domestic industry led by MIC has been hooked up together and has undertaken the system architecture design. In this paper, overall introduction of the system and its architectural design aspects will be presented. An exploration of the system functions including harmful interference searching is presented to such an extent as to provide the overall picture of the system in term of its architecture and functional capabilities.
감시시험 결과를 이용한 국내원전 압력용기 재료의 Chemistry Factor 및 RT<sub>PTS</sub> 평가여유도 분석
이호진,윤지현,최권재,이봉상,Lee, Ho-Jin,Yoon, Ji-Hyun,Choi, Kwon-Jae,Lee, Bong-Sang 한국압력기기공학회 2011 한국압력기기공학회 논문집 Vol.7 No.3
The chemistry factor and RTPTS margin for domestic reactor pressure vessel materials were analyzed by using the surveillance data which have been obtained from 8 nuclear power plants in Korea. The surveillance data have been used to assess the integrity of the pressure vessel under the pressurized thermal shock (PTS) event. The chemistry factor, which is determined by the Cu and Ni contents of vessel materials, is considered a proper tool to assess the $RT_{PTS}$. The chemistry factors, which were obtained from the surveillance data of domestic reactor pressure vessels, were investigated and compared with those of Regulatory Guide 1.99 in this study. Regressions for ${\Delta}RT_{NDT}$ were performed to expect the chemistry factor as a function of Cu and Ni, and to estimate $RT_{PTS}$ margin. The margin analysis was performed by comparing the regression graphs and standard deviations with those of Regulatory Guide 1.99. The standard deviations calculated by using the domestic surveillance data for base metal and welds are almost same as the standard deviations which are suggested on Regulatory Guide 1.99, Rev.2.