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A Review on Liquid Radioactive Waste Processing System for Radioactive Waste Treatment Facility
HyunMin Kim,JunKi Baik,SukWon Jung,GangWoo Ryu 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
The type of radioactive waste that may occur in the process of NPP dismantling can be classified into solid, liquid, gas, and mixed waste. Most of the radioactive waste generated during the dismantling of a NPP is metal solid waste, but liquid radioactive waste is also a very important factor in terms of radiation environmental impact assessment. In the case of liquid radioactive waste, it is necessary to calculate the generation amount in order to design liquid radioactive waste processing system of Radioactive Waste Treatment Facility (RWTF). Depending on the amount of liquid radioactive waste generated, the type of liquid radioactive waste processing system included in the RWTF is different. In addition, in order to apply to the domestic RWTF, it is important to secure the site area occupied by the each system, the liquid radioactive waste treatment capacity of the system, and how to secure circulating water used for dilution and discharge of liquid radioactive waste. Therefore, this review aims to suggest an optimal method for the treatment system for liquid radioactive waste included in RWTF of Wolseong.
A Review on Liquid Radioactive Waste Generated for Decommissioning of NPP
HyunMin Kim,JunKi Baik,SukWon Jung,GangWoo Ryu 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
The type of radioactive waste that may occur in the process of nuclear power plant dismantling can be classified into solid, liquid, gas, and mixed waste. The amount of these wastes must be defined in the Final Decommissioning Plan for approval of the licensing. Also, in the case of liquid radioactive waste, it is necessary to calculate the generation amount in order to treat radioactive waste at a Radioactive Waste Treatment Facility (RWTF) or on-site. In this regard, there is no Code and Standard for the amount of liquid radioactive waste generated during NPP are dismantled, but ANSI/NS-55.6 describes the amount of liquid radioactive waste generated from a light water reactor type NPP. This code is applied to nuclear power-related facilities such as domestic NPP and radioactive waste disposal facility. Therefore, this review intends to suggest an application plan for domestic NPP decommissioning through codes for liquid radioactive waste expected to generate during nuclear power plant decommissioning.
Hyunmin Yoon(윤현민),Minsoo Ryu(유민수) Korean Institute of Information Scientists and Eng 2018 정보과학회논문지 Vol.45 No.5
Deterministic replay mechanisms have proved to be useful in many areas including debugging, fault tolerance, security, and postmortem analysis because they can deterministically reproduce a computer system’s execution. However, proposed full-system replay mechanisms have limited applicability because of their reliance on special hardware instrumentation or virtual machine (VM) technology. In this paper, we present a purely software-based approach to full-system replay, a software black box (SBB) that does not require either special hardware instrumentation or virtual machine technology. Our proposed SBB can deterministically replay a full software system, including both applications and the OS itself. We have implemented a prototype of SBB in an embedded RTOS on top of ARMv7 Cortex-A9 and have carried out experiments to evaluate our approach. Our experiments demonstrate that SBB can successfully reproduce subtle concurrency bugs, such as races and deadlocks that may occur both in applications and in the OS kernel. We also show that the event and data logging of SBB incurs such small performance overhead that it can be enabled permanently in the OS kernel.
A Review on Types of Induction Melter in Radioactive Treatment Waste Facilities
HyunMin Kim,JunKi Baik,SukWon Jung,GangWoo Ryu 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
The type of radioactive waste that may occur in the process of nuclear power plant dismantling can be classified into solid, liquid, gas, and mixed waste. The amount of these wastes must be defined in the Final Decommissioning Plan for approval of the licensing. Also, in the case of Metal radioactive waste, it is necessary to calculate the generation amount in order to treat radioactive waste at a Radioactive Waste Treatment Facility (RWTF). Since a large quantity of metal radioactive waste is generated during the decommissioning of a nuclear power plant, the application of a metal melter for reduction is considered. The metal waste is heated to a temperature above the melting point and separated into liquid and gas forms. Nuclides existing on the surface of metal waste vaporize in a melting furnace to become dust or collect in sludge. Nonvolatile nuclides such as Co, Fe and Mn remain in ingot, but other nuclides can be captured and reduced with dust and sludge. And the types of melting furnaces to be applied can be broadly classified into Atmospheric Induction Melter (AIM) and Vacuum Induction Melter (VIM). Therefore, this review intends to compare the two types of metal furnaces to be included in RWTF.
Seongyon Ryu,Doowon Choe,Kangyoon Lee,Myoungho Sunwoo,Wooseok Kim,Kyoungmin Lee,Hyunmin Cho,Yeongik Yoo 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Smart high side power switches are being increasingly demanded for the replacement of the automotive relays and fuses. Compared with the relays, the smart high side power switch has relatively faster operation speed, high reliability, and improved durability by its non-contact structure. In addition, self-diagnosis, and protection functions are available with one integrated chip. In this paper, Smart Automotive Switch(SAS), which is a smart high side power switch, were introduced. The advantages of the SAS were mentioned with several application examples where the automotive electronic systems are applied by the SASs. Through an experimental study on the SAS, the suitability of the SAS was validated for designing improved electronic control systems in automotive application areas.
AUTOSAR 기반 소프트웨어의 실시간성 보장을 위한 태스크와 메시지의 우선순위 지정 방법
윤현민(Hyunmin Yoon),김태호(Taeho Kim),맹지찬(Ji Chan Maeng),김재철(Jaecheol Kim),김석종(Seokjong Kim),구진모(Jinmo Koo),유민수(Minsoo Ryu) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The rapidly increasing complexity of automotive software has led to an open industry standard, AUTOSAR (AUTomotive Open Systems ARchitecture). The AUTOSAR standard centers around specifying requirements on automotive software architectures and process flows for software development. Since it does not provide specific design and implementation methods, automotive system designers should rely on their own experience and heuristic algorithms that may result in suboptimal designs. In this paper, we consider one of important software design issues, i.e., how to guarantee hard real-time constraints imposed on tasks and communication messages, within the AUTOSAR framework. We first show that the AUTOSAR task model can be transformed into a real-time task model that is amenable to response time analysis. We then propose an iterative priority assignment method based on response time analysis and genetic algorithm.
이지형(Jihyeong Lee),최현민(Hyunmin Choi),류민형(Minhyoung Ryu),조진수(Jinsoo Cho) 한국항공우주학회 2015 韓國航空宇宙學會誌 Vol.43 No.2
덕트는 항공기의 내부엔진에 외부 공기를 흡입하기 위한 장치이다. 엔진 입구면의 레이더 반사량을 줄여 피탐지성을 감소시키기 위하여 S형태의 덕트를 가지게 되었다. S-Duct는 중심선의 곡률, 입구형상 등의 형상변수에 따라 엔진의 성능에 영향을 미친다. 본 연구에서는 RAE M 2129 S-Duct의 입구형상에 대하여 가로세로비의 변경에 따른 덕트 내부 유동에 대한 유동 특성을 알아보기 위해 전산해석을 수행하였다. S-Duct의 성능 평가 기준으로는 유동 왜곡계수를 사용하였다. 공력해석을 위해 상용해석 소프트웨어를 사용하였으며, 벽면에서의 역압력 구배의 영향으로 발생하는 유동박리와 2차 유동을 예측하기 위하여 k-?SST난류모델을 사용하였다. S-Duct의 Port side와 Starboard side 각각의 압력분포 값에 대하여 ARA의 실험값과 비교하여 본 연구에서 사용된 전산해석 기법의 타당성을 검증하였다. 해석 결과 모든 형상에 대하여 유동박리와 2차 유동이 발생하는 것을 확인하였다. 반원형 형태의 입구형상을 가지는 S-Duct가 뛰어난 성능을 보임을 확인하였다. Aircraft needs an inlet duct to supply the airflow to engine face. A fighter aircraft that requires low radar observability has to hide the engine face in the fuselage to reduce the Radar Cross Section(RCS). Therefore, the flow path of the inlet duct is changed into S-shape. The performance of the aircraft engine is known to be influenced by the shape and the centerline curvature of the S-Duct. In this study, CFD analysis of the RAE M 2129 S-Duct has been performed to investigate the influence of aspect ratio of inlet geometry. The performance of the S-Duct is evaluated in terms of the distortion coefficient. To simulate the flow under adverse pressure gradient better, k-? SST turbulence model is employed. The computational results are validated with the ARA experimental data. The secondary flow and the flow separation are observed for all computational cases, while the semi-circular geometry has been found to produce the best results.