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An Economic Analysis of Hybrid Structural System of LH Housing Apartment
Jongdae Bang,Bumsik Lee,Jiyoung Park,Sanghoon Song,Byungyun Bae 한국주거학회 2015 한국주거학회 국제학술대회논문집 Vol.2015 No.4
The structure system of apartment most widely being spread in Korea is the wall type apartment. Although the wall type apartment secures the high durability, there is a limit in accepting social change, functional change, change of family composition, and resident change, and future house should have long functional lifespan as well as physical lifespan. To activate the long life housing, the plan is needed that reduces the construction cost of long life house into the similar level to the construction cost of existing wall type apartment. In this study, the activation plan of long life house will be looked for through the economic feasibility analysis of already developed LH-type hybrid structure system. The economic feasibility of LH-type hybrid structure system is analyzed through the comparison with existing wall type apartment. The main analysis range is limited to the comparison of direct construction cost and comparison of construction project cost following the schedule improvement. Second, LH-type hybrid structure system and direct construction cost of wall type apartment are compared and analyzed by contraction process. Third, when applying LH-type hybrid structure system to the wall type apartment business district, the schedule improvement effect is analyzed. Fourth, when applying LH-type hybrid structure system, the construction project cost following the schedule improvement is analyzed by Net Present Value. Fifth, when analyzing the construction project cost following the schedule improvement, materials of LH construction are used to know the collected amount and time of selling cost. The deduced result from this study will be used usefully in apprehending the technical development direction of future long life house. Also, it will present the construction cost-reducing direction for competitiveness securing of the long life house.
Actively cooled plasma-facing components and coolant removal system in KSTAR
Bang, Eunnam,Jeong, Nam-yong,Hong, Suk-Ho,Kong, Jongdae,Park, Kaprai Elsevier 2017 Fusion engineering and design Vol.124 No.-
<P><B>Abstract</B></P> <P>This paper deals with the first commissioning of active cooling system and coolant removal system for plasma-facing components (PFCs). During 2015 KSTAR campaign, we have achieved a 55s long pulse H-mode plasma operation. However, some plasma shots were terminated, not because of instabilities or limitation of heating power, but because of safety limit applied to the PFCs temperature: upper boundary to lock the system is 400°C to protect the machine, and unlocked at 200°C. In order to overcome this limitation and to achieve longer pulse, an active cooling system is installed. With the active cooling, the temperature of lower divertor is about 302°C lower than that of upper divertor and returned quickly to initial temperature resulting in reduction of shot interval: Inertial cooling takes much longer time to unlock the safety inter-lock. One technical issue of this active cooling of PFCs is to remove coolant from the “cooling line”. The cooling line, pipe system inside the PFCs are also used to bake the PFCs. Therefore, a coolant removal system is assembled. The system is consists of adsorption dryer (external heater non purge air dryer), gas cooler, pipes and valve components. The coolant removal system was operated for 8days during PFC baking operation period. The dew point of requirement value (<−40°C) was decreased to −80°C, and then PFC baking operation was well done. And we could be achieved a 70s long pulse H-mode plasma at 2016 campaign.</P> <P><B>Highlights</B></P> <P> <UL> <LI> KSTAR have been operated the long pulse more than 50 seconds and the first commissioning of active cooling for PFC have been successfully done. </LI> <LI> After plasma shot, the temperature of PFC tiles returned quickly to initial temperature and the shot interval time is reduced. </LI> <LI> The coolant removal system is consist of adsorption dryer with 3000Nm<SUP>3</SUP>/hr of flow capacity. </LI> <LI> The PFCs baking was well operated. The PFCs baking and cooling operation was well done at a time to maintain of lower vacuum pressure, to remove the water of vacuum vessel and for cooling of PFCs. </LI> <LI> The performance and operation period of coolant removal system can be confirmed. </LI> </UL> </P>
무선 센서네트워크에서의 시각동기를 위한 재귀적 클럭 스큐 추정 방법
김동진 ( Dongjin Kim ),맹세영 ( Seyeong Maeng ),방종대 ( Jongdae Bang ),이연우 ( Yeonwoo Lee ),정민아 ( Min-a Jung ),이성로 ( Seong Ro Le ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.1
무선 센서네트워크에서의 시각동기는 MAC 계층에서부터 APP 계층에 이르기까지 거의 모든 계층에서 다양한 목적을 위해 매우 중요한 기술이다. 본 논문에서는 무선 센서네트워크에서의 에너지 효율적인 시각동기를 위한 실시간 클럭 스큐 추정 방법을 제시한다. 재귀적 최소제곱법을 통해 오프셋 보정 정보들을 얻을 때마다 클럭 스큐가 실시간적으로 추정 및 갱신되며, 아울러 스큐 추정을 위해 각 센서노드에 저장해야할 정보를 최소화한다. 제안한 클럭 스큐 추정 방법은 기존의 클럭 오프셋 보정 방법과 쉽게 통합될 수 있으며, 이 경우 보다 정확하고 효율적인 시각동기화가 가능해진다. 시뮬레이션 및 실험 결과를 통해 제안한 클럭 스큐 추정 방법을 통한 시각동기 정확도의 향상을 보인다.