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운용실적을 이용한 근접방어무기체계(CIWS) RAM 목표값 설정 연구
박영만(Youngman Park),최영두(Youngdoo Choi),홍순국(Soonkook Hong),한민석(Minseok Han),정재범(Jaebeom Jeong),한영진(Young Jin Han),이기원(Kiwon Lee),이승욱(Seungwook Lee) 한국해군과학기술학회 2023 Journal of the KNST Vol.6 No.4
CIWS(close-in weapons systems) is a very important weapon system in warships as the last defense weapon against enemy missiles. In order to calculate the CIWS RAM value, the operation records of the warships currently operating CIWS and the maintenance and repair details of each warships CIWS were collected. Based on these data, the RAM value of CIWS was calculated through the operation time analysis of CIWS and the failure and repair time analysis to set the RAM value.
시뮬레이션을 활용한 근접방어무기체계(CIWS) RAM 목표값 검증 연구
한영진(Young Jin Han),최영두(Youngdoo Choi),홍순국(Soonkook Hong),한민석(Minseok Han),정재범(Jaebeom Jeong),박영만(Youngman Park),이기원(Kiwon Lee),이승욱(Seungwook Lee) 한국해군과학기술학회 2023 Journal of the KNST Vol.6 No.4
Closed-in weapon system (CIWS) is the final defense system that defends against enemy attacks. In this study, we verify the RAM target value of CIWS set based on the operation mode summary/mission profile for CIWS. To this end, the operation scenario of CIWS is modeled through simulation and the possibility of achieving the RAM target value is reviewed through CIWS RAM analysis based on the failure rate of important components of similar weapon systems.
이준석 ( Junseok Lee ),장용성 ( Yongsung Chang ),최영두 ( Youngdoo Choi ) 한국경제학회 2022 經濟學硏究 Vol.70 No.1
본 연구는 고용-생산 관계(오쿤의 법칙) 및 고용-물가상승율간 관계(필립스 곡선)변화를 미국·한국의 사례를 중심으로 비교 분석하였다. 먼저 고용과 생산은 최근 들어 동조성이 크게 약화 되었다. 실업율-물가상승율 상충관계는 단기에 관측되나 그 위치 및 기울기 변화가 심했다. 특히 2010년 이후에는 기울기의 역전이 관찰되었다. 이러한 거시경제 주요 변수 간 관계 변화는 정부의 거시경제 정책 수립, 특히 중앙은행의 정책 타이밍을 어렵게 만들 것으로 예상된다. We study two important relationships in macro economic analysis: (i) co-movment between output and employment (the so-called Okun’s law) and (ii) the trade-off between inflation and unemployment rate (the Phillips Curve). We find that there have been important changes in these relationships in the last 30 years in both U.S. and South Korea. The co-movment between output and employment has weakened significantly, often coined as the “jobless recoveries.” The Phillips Curve has shifted as well. In particular, the slope has flattened over time and even becomes a negative since 2000 in Korea and since 2010 in the U.S., respectively. We argue that these changes present a big challenge to policy makers.