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해상 LNG 벙커링 터미널용 파일 가이드 계류 시스템 설계
이성엽(Seong-yeob Lee),장대준(Daejun Chang) 한국해양공학회 2017 韓國海洋工學會誌 Vol.31 No.6
In this study, a pile-guide mooring system (PGMS) was designed for an offshore liquefied natural gas bunkering terminal (LNG-BT), which is an essential infrastructure for large LNG-fuelled ships. The PGMS consisted of guide piles to restrict five motions of the floater, except for heave, as well as a seabed truss structure to support the guide piles and foundation piles to fix the system to the seabed. Singapore port was considered for a case study because it is a highly probable ports for LNG bunkering projects. The wave height, current speed, and wind speed in Singapore port were investigated to calculate the environmental loads acting on the hull and PGMS. A load and resistance factor approach was used for the structural design, and a finite element analysis was performed for design verification. The steel usage of the PGMS was analyzed and compared with the material usage of a gravity-based structure under similar LNG capacity and water depth criteria. This paper also describes the water depth limit and wave conditions of the PGMS based on estimation of the initial investment and the present value profit difference. It suggests a suitable LNG-BT support system for various design conditions.
한상헌(Sang Heon Han),장대준(Daejun Chang),임하영(Ha Young Lim) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Thermal efficiency of a reheating furnace has been predicted by calculating radiation heat transfer to slabs and furnace wall. The entire furnace is divided into fourteen sub-zones and each sub-zone is assumed to have same temperature which represents average temperature of the sub-zone. The temperatures of medium and wall of each sub-zone are computed by taking heat balance. The radiation heat transfer is solved by the FVM radiation method and blocked?off method is applied to the treatment of the slabs inside which intensity has no meaning.
퍼지기반 해양 미생물 이용 수소 제조 공정의 고장유형 및 영향분석
박성호,안준건,김수현,유영돈,장대준,강성균,PARK, SUNG HO,AHN, JUNKEON,KIM, SU HYUN,YOO, YOUNG DON,CHANG, DAEJUN,KANG, SUNGKYUN 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.4
In this study, the failure mode and effect analysis (FMEA) of hydrogen production process by using the Thermococcus onnurineus NA1 was conducted and advanced methodology to compensate the weakness of previous FMEA methodology was applied. To bring out more quantitative and precise FMEA result for bio-hydrogen production process, fuzzy logic and potential loss cost estimated from ASPEN Capital Cost Estimator (ACCE) was introduced. Consequently, risk for releasing the flammable gases via internal leakage of steam tube which to control the operating temperature of main reactor was caution status in FMEA result without applying the fuzzification and ACCE. Moreover, probability of the steam tube plugging caused by solid property like medium was still caution status. As to apply the fuzzy logic and potential loss cost estimated from ACCE, a couple of caution status was unexpectedly upgraded to high dangerous status since the potential loss cost of steam tube for main reactor and decrease in product gases are higher than expected.