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김장열(Jang-Yeol Kim) 한국디지털콘텐츠학회 2021 한국디지털콘텐츠학회논문지 Vol.22 No.1
Computer code means application software packages for development of various reactor. These software can be classified as safety-critical, safety-related and non-safety. The quality assurance process of safety software must comply with international acceptable framework such as IEEE-Std standards and IEC-Std standards. Safety-critical software and safety-related software should be licensed through the review by a regulatory body. This paper proposed a safety software qualification process for licensing suitability about safety-critical software and safety-related software. We proposed a quality assurance evaluation process such as the scope of application for licensing requirements, design, implementation, and test activities for each process according to the software development life cycle from point of the verifier viewpoint. This paper is to update the computer code quality assurance system based on the existing ASME/NQA-1, 1994, 1995a to the system based on ASME/NQA-1, 2008, 2009a to meet the latest international Code & Standard trends. The Code Cut-off Date issues were solved. Seven kinds of computer code guidelines were developed according to the suggested nuclear-oriented computer code quality assurance process.
김장열(Jangryoul Kim),임기영(Gieyoung Lim) 한국외국어대학교 영미연구소 2007 영미연구 Vol.17 No.-
This paper employs the Kalman filter technique to estimate stochastic bubbles for exchange rates between the U.S. dollar and the Euro and the Canadian dollar. We obtain a significant evidence supporting that the U.S. dollar has recently been undervalued below its fundamental values. The results are qualitatively the same when the model is extended to incorporate conditional heteroskedasticity in errors.
영문 ; 상태 변환하의 최적 통화 정책 -미국 주택 시장의 경우-
김장열 ( Jang Ryoul Kim ),임기영 ( Gie Young Lim ) 국제지역학회 2008 국제지역연구 Vol.12 No.3
본 연구에서는 경제 내 갑작스런 구조적 변화가 있을 경우의 최적 통화정책 준칙을 살펴본다. 연구의 첫 단계에서는 Markov 상태전환모형을 이용하여 미국 주택가격 상승률의 추이에 두 개의 상이한 상태가 존재함을 보인다. 식별된 두 개의 상태 중 하나는 실질 이자율이 상승시 주택 가격 상승률이 하락한다는 면에서 `통상적`인 상태로 보인다. 반면, 다른 상태 하에서는 주택가격 상승률과 실질 이자율이 양의 상관관계를 갖는다는 면에서 `이례적`인 상태라 할 수 있다. 연구의 두 번째 단계에서는 주택시장에 이와 같은 두 개의 상태가 존재할 경우 중앙은행의 최적통화준칙을 살펴본다. `통상적` 상태 하에서는 인플레이션 압력에 반대로 대응해야 하는 반면, `이례적` 상태에서는 인플레이션 압력을 수용(accommodate)해야 한다는 면에서 중앙은행의 최적통화정책은 비대칭적이다. 또한, 미래 상태에 대한 불확실성이 있을 경우 더욱 보수적으로 통화정책을 운용해야 한다는 결과가 도출된다. In this paper, we address the problem of optimal monetary policy rule in the presence of abrupt shifts in the structure of the economy. To do so, we first estimate a Markov switching model for the US housing price inflation, and find evidence supporting the presence of two distinct regimes for the US housing price inflation. One of the two regimes identified appears `usual`, in that housing price inflation negatively responds to higher real interest rate. The other regime is `unusual`, in that the housing price inflation is positively related with real interest rate. We then solve an optimal control problem of the FRB under the presence of the two regimes thus identified. The optimal policy is `asymmetric` in that the optimal responses in the `usual` regime require the FRB to lean against the wind to inflationary pressure, while the FRB is recommended to accommodate it in the unusual regime. It is also found that the optimal degree of responses is more conservative when the FRB acknowledges the uncertainty about future regime.
Asymmetric Effects of US Housing Price Inflation on Optimal Monetary Policy
김장열,김민영,임기영 국제지역학회 2009 국제지역연구 Vol.13 No.2
This paper studies optimal discretionary monetary policy in the presence of uncertainty in the housing sector. In particular, we allow two possible regimes regarding the evolution of housing price inflation and the effects of housing price inflation on the aggregate demand. Estimation results with the US data confirm the presence of two distinctive regimes, one 'normal' and the other more akin to the housing price 'bubble' state. The optimal policy is 'asymmetric' in that the optimal responses in the 'normal' regime require the central bank to lean against the wind to inflationary pressure from CPI and housing inflation, while the central bank is recommended to accommodate it in the other regime. This paper studies optimal discretionary monetary policy in the presence of uncertainty in the housing sector. In particular, we allow two possible regimes regarding the evolution of housing price inflation and the effects of housing price inflation on the aggregate demand. Estimation results with the US data confirm the presence of two distinctive regimes, one 'normal' and the other more akin to the housing price 'bubble' state. The optimal policy is 'asymmetric' in that the optimal responses in the 'normal' regime require the central bank to lean against the wind to inflationary pressure from CPI and housing inflation, while the central bank is recommended to accommodate it in the other regime.