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Chansoo Lee,Youho Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
Dry storage of nuclear fuel is compromised by threats to the cladding integrity, such as creep and hydride reorientation. To predict these phenomena, spent fuel simulation codes have been developed. In spent fuel simulation, temperature information is the most influential factor for creep and hydride formation. Traditional fuel simulation codes required a user-defined temperature history input which is given by separate thermal analysis. Moreover, geometric changes in nuclear fuel, such as creep, can alter the cask’s internal subchannels, thereby changing the thermal analysis. This necessitates the development of a coupled thermal and nuclear fuel analysis code. In this study, we integrated the 2D FDM nuclear fuel code GIFT developed at SNU with COBRA -SFS. Using this, we analyzed spent nuclear stored in TN-24P dry storage cask over several decades and identified conditions posing threats due to phenomena like creep and hydrogen reorientation, represented by the burnup and peak cladding temperature at the start of dry storage. We also investigated the safety zone of spent nuclear fuel based on burnup and wet storage duration using decay heat.
Chansoo Lee,Youho Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
This study reassess safety margin of the current Peak Cladding Temperature (PCT) limit of dry storage in terms of hydrogen migration by predicting axial hydrogen diffusion throughout dry storage with respect to wet storage time and average burnup. Applying the hydride nucleation, growth, and dissolution model, an axial finite difference method code for thermal diffusion of hydrogen in zirconium alloy was developed and validated against past experiments. The developed model has been implemented in GIFT – a nuclear fuel analysis code developed by Seoul National University. Various discharge burnups and wet storage time relevant to spent fuel characteristics of Korea were simulated. The result shows that that the amount of hydrogen migrated towards the axial end during dry storage for reference PWR spent fuel is limited to ~50 wppm. This result demonstrates that the current PCT margin is sufficient in terms of hydrogen migration.
Estimation of the scale parameter of the Rayleigh distribution under general progressive censoring
Chansoo Kim,Keunhee Han 한국통계학회 2009 Journal of the Korean Statistical Society Vol.38 No.3
Based on a general progressively type II censored sample, the maximum likelihood estimator (MLE), Bayes estimator under squared error loss and credible intervals for the scale parameter and the reliability function of the Rayleigh distribution are derived. Also, the Bayes predictive estimator and highest posterior density (HPD) prediction interval for future observation are considered. Comparisons among estimators are investigated through Monte Carlo simulations. An illustrative example with real data concerning 23 ball bearings in a life test is presented.
Chansoo Cho(조찬수) 고려대학교 일민국제관계연구원 2009 국제관계연구 Vol.14 No.2
이 논문은 하나의 신념체계로서 미국예외주의가 미국대외정책의 주된 수단들 가운데 하나인 경제제재가 도덕적 가치의 옹호를 위해 빈번히 사용되는 데 어떤 영향을 미치는지를 매사추세츠 주 버마법의 사례를 통해 검토한다. 미국예외주의가 하나의 문화적 변수로서 특정한 대외정책결과에 직접적으로 영향을 미친다고 주장하기보다는 이 논문은 미국적 가치가 보편적이라고 이해하는 신념체계가 구체적인 정책으로 귀결될 수 있는 특정한 환경이 무엇인지를 제도주의적 관점에서 탐구한다. 미국예외주의가 정책과정에서 작동할 수 있게 해주는 제도적 요인들로서 연방제, 입법부 중심의 정치과정, 그리고 사법부의 역할이 고려된다. 결론에서는 그 실질적 효용에 대한 끊임없는 의문에도 불구하고 하위정부들의 대외정책 관여가 경제개방과 상호의존으로 특징지어지는 세계화시대에 계속될 것이라는 관측을 제시한다. This paper explores possible links between American exceptionalism as a set of institutional characteristics and the frequent use of economic sanctions by the United States, using the case of the Massachusetts Burma Law. From an institutionalist perspective, I argue that America’s recurrent use of moral issues in addressing foreign relations is an outcome of the institutional universe that allows political entrepreneurs to set an agenda and push for it in a strategically efficient way. If one were to explain why Americans keep making domestic laws targeting foreign countries with poor human rights records, the dimension of American exceptionalism cannot be easily omitted in modeling causal relationship. This paper has no intention to deny the causal role of ideas in entirety; rather it seeks to clarify under what circumstances American exceptionalism as a belief system helps shape the policy contours of major political actors. As a fully independent role of ideas is not easy to measure in empirical tests, I here suggest some institutional characteristics that lead career-maximizing politicians to design foreign policy initiatives popular among the local constituency.