• Nuclear Engineering and Technology
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• 제48권5호
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• pp.1071-1082
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• 2016

Korea Atomic Energy Research Institute has been developing a pool-type sodium-cooled fast reactor of the Prototype Gen-IV Sodium-cooled Fast Reactor (PGSFR). To assess the effectiveness of the inherent safety features of the PGSFR, the system transients during design basis accidents and design extended conditions are analyzed with MARS-LMR and the subchannel blockage events are analyzed with MATRA-LMR-FB. In addition, the invessel source term is calculated based on the super-safe, small, and simple reactor methodology. The results show that the PGSFR meets safety acceptance criteria with a sufficient margin during the events and keeps accidents from deteriorating into more severe accidents.

• Journal of Welding and Joining
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• 제29권4호
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• pp.67-72
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• 2011

The proportion of the welding in the production process of machinery, buildings and marine structures is increasing and the joining are mainly conducted by butt and fillet weld. In the case of fillet weld, the shape of structures is complicated depending on the constraint on the geometry of the structures, therefore, the full penetration is mostly difficult. Accordingly, it is necessary to establish safe and economical criteria of design of the structures through the strength based on the penetration state of the fillet weld. Patterns of fatigue failure in cruciform fillet weld jont appear in the form of the root, toe and mixed failure. In the case of toe and mixed failure, the fatigue strength is higher than root failure. Therefore, we have to make the enough depth of penetration or perform the welding work through improving the fatigue strength of cruciform joints in welded structures. So it is necessary to optimize the penetrated depth in the range of the possible mixed failure and find the way in the cost-effective design to lessen the amount of the welding work.

• 한국기계가공학회지
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• 제13권4호
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• pp.44-49
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• 2014

Roll forming technology has a problem in that it depends only on experience without accurate data in the actual field. To solve this problem, it is necessary to procure accurate data during the roll forming process. To this end, we determined the operating force and the material thickness by implementing several changes to those variables during an experiment. This study compares the FEA results and experimental results. Experimental results were used for the basic data of the design. The FEA results show that the roll forming machine is operating accurately and safely. And, a comparison of the results shows that the design of the automatic roll forming machine is operating in the right way. This design of an automatic roll forming machine will be helpful for many areas of the industry.

• Structural Engineering and Mechanics
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• 제23권5호
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• pp.579-597
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• 2006

The behaviour of reinforced concrete moment resisting frame structures in recent earthquakes all over the world has highlighted the consequences of poor performance of beam column joints. Large amount of research carried out to understand the complex mechanisms and safe behaviour of beam column joints has gone into code recommendations. This paper presents critical review of recommendations of well established codes regarding design and detailing aspects of beam column joints. The codes of practice considered are ACI 318M-02, NZS 3101: Part 1:1995 and the Eurocode 8 of EN 1998-1:2003. All three codes aim to satisfy the bond and shear requirements within the joint. It is observed that ACI 318M-02 requires smaller column depth as compared to the other two codes based on the anchorage conditions. NZS 3101:1995 and EN 1998-1:2003 consider the shear stress level to obtain the required stirrup reinforcement whereas ACI 318M-02 provides stirrup reinforcement to retain the axial load capacity of column by confinement. Significant factors influencing the design of beam-column joints are identified and the effect of their variations on design parameters is compared. The variation in the requirements of shear reinforcement is substantial among the three codes.

• 한국실내디자인학회논문집
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• 제15권3호
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• pp.163-172
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• 2006

The underground space of the Banwoldang in Daegu is the private enterprise historical development project that Daegu City & The forth construction company of the Samsung, Kolon, Daewoo, Hwasung promote, and take a role as the underground bridgehead that links east and west of the Daegu as the lunction of the 2 subway line. Accordingly, the underground space of the Banwoldang in Daegu have a import significance in that not only the alternative of the solution about the simple commercial formation or the limited ground but also compose the important axis of the city develoment. But, When I see the variety of problems, especially see the negative import in Daegu, the solution of the problems is the large underlying cause that revitalize the city. Consequently, in the study I would like to analyze the characteristics of the large underground space and the directivity of the interior design, to assistant for the develement plan of the more safe, comfort underground space.

• Nuclear Engineering and Technology
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• 제56권3호
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• pp.922-932
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• 2024

This paper presents the design features and preliminary design analysis results of the Wielenga Innovation Static Salt Reactor (WISSR). The WISSR incorporates features that make it both flexible and inherently safe. It is based on innovative technology that controls a nuclear reactor by moving molten salt fuel into or out of the core. The reactor is a low-pressure, fast spectrum transuranic (TRU) burner reactor. Inherent shutdown is achieved by a large negative reactivity feedback of the liquid fuel and by the expansion of fuel out of the core. The core is made of concentric, thin annular fuel chambers containing molten fuel salt. A molten salt coolant passes between the concentric fuel chambers to cool the core. The core has both fixed and variable volume fuel chambers. Pressure, applied by helium gas to fuel reservoirs below the core, pushes fuel out of a reservoir and up into a set of variable volume chambers. A control system monitors the density and temperature of the fuel throughout the core. Using NaCl-(TRU,U)Cl₃ fuel and NaCl-KCl-MgCl₂ coolant, a road-transportable compact WISSR core design was developed at a power level of 1250 MWt. Preliminary neutronics and thermal-hydraulics analyses demonstrate the technical feasibility of WISSR.

• 청정기술
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• 제26권3호
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• pp.161-167
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• 2020

가연성 물질을 사용하는 화학공정 산업에서 저장 안전성을 높이고 화재 및 폭발 예방 조치를 설계하려면 신뢰할 수 있는 인화점에 대한 정보가 필요하다. 본 연구는 석유화학 공정에서 중요한 용매와 가솔린의 옥탄가 향상제로 사용되는 방향족, 나프텐 및 파라핀계 탄화수소 화합물과 알킬알코올에 대한 이성분 혼합물의 인화점 데이터를 얻는 것이다. 그래서 이성분 혼합물인 {2-butanol + 2,2,4-trimethylpentane}, {2-butanol + methylcyclohexane} 그리고 {2-butanol + toluene} 계에 대한 최소인화점을 Stanhope-Seta 밀폐식 인화점 측정기를 이용하여 측정하였다. 각 이성분계 혼합물에 대한 인화점을 예측하기 위해 이상성인 라울의 법칙(Raoult's law)과 비이상성인 Wilson, NRTL 그리고 UNIQUAC 매개변수를 이용하였고 실험 결과와 비교해 보았다. 이상성을 나타내는 라울의 법칙(Raoult's law)보다 비이상 용액 혼합물의 활동도 계수 모델에서 2.36 K 이하의 좋은 결과를 나타내었다. 본 연구의 결과는 가연성 혼합물을 함유한 석유화학 용매의 안전한 저장 및 공정 설계에 적용할 수 있다.

• 한국융합학회논문지
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• 제12권2호
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• pp.45-50
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• 2021

본 논문에서는 IoT를 이용하여 원격 개폐가 가능한 스마트 공간 보안에 대한 장치 개발을 제안한다. 기존의 공간 보안 장치는 하드웨어를 부수거나 버튼 장치 또는 복제된 열쇠를 사용하여 개폐를 제어할 수 있었다. 최근 COVID-19 사태로 비접촉 장치에 대한 여러 응용 분야가 생겨났다. 본 연구에서는 장치에 접촉하지 않아도 앱을 통해 잠금을 해제 하는 기능을 가진 소형 공간 보안 장치 개발을 제안한다. 제어의 권한을 스마트폰으로 이전하여 사용자의 선택에 따라 하드웨어 조작만으로는 개폐할 수 없는 기능을 가진 장치를 고안하였다. 잠금 장치 접촉을 하지 않아도 앱을 이용하여 개폐가 가능하므로 편리하고 위생적이다. 스마트폰의 지문 인식 및 패턴 입력으로 사용자 인증 후 앱을 이용하므로 다중보안 기능을 가지고 있다. 사용자가 원한다면 앱 보안 해제 후 금고 또는 공간에 장착된 버튼을 직접 터치하거나 열쇠로 열면 보안이 해제된다. 또한 앱에 비활성 기능을 추가시켜 열쇠를 분실하거나 소형의 금고를 분실했을 경우 사용이 불가능하게 되어 금고의 문이 열리지 않도록 설계하였다. 본 연구는 보안이 필요한 사물에 다양하게 응용하여 효과적으로 확장할 수 있을 것으로 기대한다.

• 한국실내디자인학회논문집
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• 제26권2호
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• pp.72-82
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• 2017

Current world population is rapidly ageing and the disabled population is expected to age seriously as well. The concern about the elderly and the disabled is increased largely not just the field of social welfare and service but the housing planning where the physical environment of everyday life is. Recently in Ireland, 'Universal Design Guideline for Homes' is established and proposed in public. It is considered as initial and special national policy for the socially venerable. The purpose of this research is to analyze the User Benefit Characteristics(UBC) of 'Universal Design Guideline for Homes in Ireland' and clearly organize the characteristics for comprehensive communication. The research subjects are 444 guidelines of 'Universal Design Guideline for Homes in Ireland.' The research is conducted by contents analysis technique, and each guideline is analyzed by the 4 main concepts of UBC- 'Behavioral Facilitation(BF)', 'Physiological Maintenance(PhM)', 'Perceptual Maintenance(PM)', 'Social Facilitation(SF).' As results, the User Benefit Characteristic of 'Universal Design Guideline for Homes in Ireland' is ordered by PhM>PM>BF>SF. The design guidelines are supposed to support ageing in place and sustainable living in the existing houses even though people are ageing or being disabled. 'Universal Design Guideline for Homes in Ireland' supports safe behavior and comfort cognition especially in indoor and surrounding outdoor environment. This research is significant for sharing the knowledge and comprehension of decreasing environmental stress of the elderly in specific, and could be utilized for developing new elderly housing in future.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제26권3호
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• pp.17-26
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• 2020

Purpose: This paper presents research evidence that the environmental design of the doffing area in a biocontainment unit (BCU) can have a measurable impact on increasing the safety of frontline healthcare workers (HCW) during doffing of high-level personal protective equipment (PPE), and proposes optimized biocontainment unit design. Methods: From 2016 to 2019, The SimTigrate Design Lab conducted 3 consecutive studies, focusing on ways in which the built environment may support or hinder safe doffing. In the first study, to identify the risky behaviors, we observed 56 simulation exercises with HCWs in 4 BCUs and 1 high-fidelity BCU mockup. In the second study, we tested the effectiveness of a redesigned doffing area on improving the HCWs performance and used simulation, observation, and rapid prototyping in 1 high-fidelity mockup of a doffing area. In a follow-up study, we used simulation and co-design with HCWs to optimize the design of a safer doffing area in a full-size pediatric BCU mock-up. Results: We identified 11 specific risky behaviors potentially leading to occupational injury, or contamination of the PPE, or of the environment. We developed design strategies to create a space for safer doffing. In the second study, in a redesigned doffing area, the overall performance of HCW improved, and we observed a significant decrease in the number of risky behaviors; some risky behaviors were eliminated. There was a significant decrease in physical and cognitive load for the HCWs. Finally, we propose an optimized layout of a BCU for a safer process of PPE doffing. Implications: The proposed BCU design supports better staff communication, efficiency, and automates safer behaviors. Our findings can be used to develop design guidelines for spaces where patients with other highly infectious diseases are treated when the safety of the patient-facing HCWs is of critical importance.