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CANDU형 원전 압력관에 존재하는 축방향 균열의 응력확대계수
이국희,오영진,박흥배,정한섭,정하주,김윤재,Lee, Kuk-Hee,Oh, Young-Jin,Park, Heung-Bae,Chung, Han-Sub,Chung, Ha-Joo,Kim, Yun-Jae 한국압력기기공학회 2011 한국압력기기공학회 논문집 Vol.7 No.1
CANDU reactor core is composed a few hundreds pressure tubes, which support and locate the nuclear fuels in the reactor. Each pressure tube provides pressure boundary and flow path of primary heat transport system in the core region. In order to guarantee the structural integrity of pressure tube flaws which can be found by in-service inspection, crack growth and fracture initiation assessment have to be performed. Stress intensity factors are important and basic information for structural integrity assessment of planar and laminar flaws (e. g. crack). This paper reviews and confirms the stress intensity factor of axial crack, proposed in CSA N285.8-05, which is an fitness-for-service evaluation code for pressure tubes in CANDU nuclear reactors. The stress intensity factors in CSA N285.8-05 were compared with stress intensity factors calculated by three methods (finite element results, API 579-1/ASME FFS-1 2007 Fitness-For-Service and ASME Boiler and Pressure Vessel Code Section XI). The effects of Poisson's ratio and anisotropic elastic modulus on stress intensity factors were also discussed.
증기발생기 축방향 부분관통균열 전열관의 파열 압력 시험
이국희,김홍덕,강용석,남민우,조남철,Lee, Kuk-Hee,Kim, Hong-Deok,Kang, Yong-Seok,Nam, Min-Woo,Cho, Nam-Cheoul 한국압력기기공학회 2014 한국압력기기공학회 논문집 Vol.10 No.1
In this research, burst tests for axial notched steam generator tubes were conducted. To measure the burst pressure of notched tubes, a burst testing system was manufactured. The tests were conducted under internal pressure at room temperature. Part-through-wall and through-wall notches which have various geometries with different depths and lengths were machined by electro-discharged-machined(EDM) method. The burst pressure decreased exponentially with increasing notch length and decreased almost linearly with increasing notch depth. A comparison of the burst pressure with existing burst pressure solutions for cracked tube show that the existing solution agree well with the test results.
코로나-19로 인한 스트레스 지각과 범주 응집성이 범주기반 귀납적 일반화에 미치는 효과
이국희,도은영,Lee, Guk-Hee,Doh, Eun Yeong 한국인지과학회 2022 인지과학 Vol.33 No.3
The purpose of this study was to confirm that the property generalization to social categories with low coherence is stronger when stress due to COVID-19 is perceived as high, compared to when stress is perceived as low. To this end, this study selected categories with high coherence(nun, soldier, flight attendant) and categories with low coherence(wedding planner, interpreter, florist), and recruited 336 participants to perform a category-based inductive generalization task(inferring how many properties repeatedly observed by some category members would appear across all category members), and measured their perceived COVID-19 stress. As a result, this study showed that when the cohesion of social categories is high, the effect of property generalization is stronger than when it is low, and the effect of property generalization is stronger in those who perceive stress due to Corona 19 higher than those who perceive it as low. In addition, this study confirmed that people who perceive COVID-19 stress strongly tend to generalize strongly to properties that are repeatedly observed in the low coherence category. This study is important in that it shows that there is a cognitive mechanism that is at the root of the phenomenon that stereotypes and prejudices deepen and discriminatory behaviors increase after the outbreak of COVID-19, such as COVID-19 stress and the resulting increase in attribute generalization tendency.
3차원 면진장치를 이용한 URANUS 액체금속로의 지진응답감소
이국희,김윤재,류강묵,황일순,유봉,Lee, Kuk-Hee,Kim, Yun-Jae,Ryu, Kang-Mook,Hwang, Il Soon,Yoo, Bong 한국압력기기공학회 2011 한국압력기기공학회 논문집 Vol.7 No.3
URANUS (Ubiquitous, Robust, Accident-forgiving, Non-proliferating, Ultra-lasting and Sustainer) has been developed with 35MWe (100MWth) operating without primary coolant pump, capitalizing on natural circulation capability of lead-bismuth eutectic (LBE) for long-life small and robust power units. To ensure the structural integrity, the large safety margin against Safe Shutdown Earthquake, 0.3g, and furthermore the cost effectiveness for URANUS, three-dimensional seismic base isolation design has been developed. The analytical model has been developed and seismic time history analyses have been carried out. The advantage for using three-dimensional seismic base isolation for URANUS has been discussed.
이국희(Kook-Hee Lee),이영구(Young-Koo Lee),장지웅(Ji-Woong Chang),이민재(Min-Jae Lee),황규영(Kyu-Young Hwang) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅰ
지리 정보 시스템이 공간 객체를 효율적으로 저장하고 관리하기 위해서는, 공간 객체의 클러스터링 특성을 유지하는 공간 액세스 통합된 하부 저장 시스템이 필요하다. 본 논문에서는 미국 위스콘신 대학에서 개발중인 지속성 객체 시스템 SHORE와 공간 액세스 방법의 한 종류인 MLGF의 통합을 설계하고 구현하였다. MLGF는 단순하고 규칙적인 알고리즘을 사용하여 트리 관리의 복잡도가 낮고 동시성 제어 및 파손 회복이 쉽다는 장점을 갖는다. 특히 MLGF는 데이타 레코드 클러스터링 성질을 갖으므로 클러스터링 색인 구성에 적합하다. 본 논문에서는 다사용자 환경에서도 통합된 MLGF를 사용할 수 있도록 MLGF에 대한 동시성 제어를 구현하였다. 그리고 오류가 발생하는 상황에서도 통합된 MLGF를 액세스하는 트랜잭션들이 원자성과 지속성을 만족성을 만족하도록 MLGF에 대한 파손 회복 기능을 구현하였다.