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RISS 인기검색어
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- 저자 : 최정열(Choi Jeong Yeol) (검색결과 326 건)
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한상훈(Sang-Hoon Han),김명호(Myeong-Ho Kim),최정열(Jeong-Yeol Choi) 한국항공우주학회 2007 한국항공우주학회지 Vol.35 No.3
이차원 범프 유동에 대한 다양한 예조건화 행렬의 수렴 특성을 살펴 Choi와 Merkle의 예조건화 행렬을 선택하여, 압축성 및 예조건화 Roe의 Riemann 해법의 수치 소산항을 수학적으로 비교하였다. 이 결과 코드의 구조는 동일하게 유지한 채, 고유치의 작은 수정만으로 압축성 해법을 예조건화 해법으로 이전할 수 있는 방법을 알 수 있었다. 아울러 점성 유동 영역에서의 안정성 및 정확성을 향상시키기 위하여 von Neumann 안정 조건 및 점성 자코비안을 고려하였으며, 개발된 코드는 표준 검증 문제에 적용하여 검증을 수행하였다. Comprehensive mathematical comparison of numerical dissipation vector was made for a compressible and the preconditioned version Roe's Riemann solvers. Choi and Merkle type preconditioning method was selected from the investigation of the convergence characteristics of the various preconditioning methods for the flows over a two-dimensional bump. The investigation suggests a way of migration from a compressible code to a preconditioning code with a minor changes in Eigenvalues while maintaining the same code structure. Von Neumann stability condition and viscous Jacobian were considered additionally to improve the stability and accuracy for the viscous flow analysis. The developed code was validated through the applications to the standard validation problems.
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재산세공동과세제도의 수평적 재정형평성 효과에 관한 연구 : 공급비용과 배분방식을 중심으로
최정열 ( Jeong Yeol Choi ),금현섭 ( Hyun Sub Kum ) 한국지방행정연구원 2012 지방행정연구 Vol.26 No.4
This study analyzes the effect on the horizontal fiscal equity of the shared property tax system(revenue sharing) initiated by Seoul Municipal Government since 2008 with respect to two distinguished points; first, it compares the equal allocation method of the shared property tax revenue in progress with other allocation methods(the financial power index, the population size index, and mixed index), second, it takes into account the service supply cost differentials among 25 autonomous districts. Analysis shows that 1) the shared property tax system in Seoul has contributed to the decrease in horizontal fiscal disparity but the effect size is a pretty modest rather than significant, and 2) a allocation method by the financial power seems better than the current equal allocation method.
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DARPA의 정적연소 (CVC) 기반 극초음속 추진기관 개발 프로그램
최정열(Jeong-Yeol Choi),노진현(Jinhyeon Noh),조덕래(Deok-Rae Cho) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.5
본 리뷰에서는 미국 DARPA가 극초음속 순항 비행체를 위하여 최근 시작한 정적연소 기반 극초음속 추진기관 개발 프로그램에 대하여 소개한다. Present review introduces the constant volume combustion (CVC)-based hypersonic propulsion system development program recently initiated by DARPA for the hypersonic cruse vehicle (HCV).
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지방정부의 정치적 이념과 정책선호: 개발정책과 복지정책에 대한 영향 비교
최정열 ( Jeong Yeol Choi ),박석희 ( Sauk Hee Park ) 한국지방행정연구원 2014 지방행정연구 Vol.28 No.4
This article analyzes the extent to which the political ideology of primary local governments affects their policy preference. To achieve this, it divides political ideology into the conservative and progressive inclination based on both the party affiliation of local government`s head and a political party securing majority seats in the primary local council, and classifies policy preference into the development-oriented and welfare-oriented policy, which is respectively assessed by the proportion of economic development budgets and welfare budgets in local government budgets. The results reveal that while the proportion of economic development budgets is likely to be higher in conservative local governments, the proportion of welfare budgets rarely differs between conservative and progressive local governments. This implies that because they have a responsibility for works related to daily life of citizens, particularly welfare services, primary local governments can not help put an emphasis on welfare services irrespective of political inclinations.
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