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The design and analysis simulation study of a PVT water and GSHP system
Jin-Woo Pak(박진우),Eun-Chul Kang(강은철),Euy-Joon Lee(이의준) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
In this study both conventional and renewable energy systems were analyzed and evaluated and detailed simulation models were developed for the six cases. The six systems, with conventional, microgeneration, and renewable energy technologies, were developed and analyzed for applications in residential and commercial building. The simulations focused on generating results aimed to gain a better understanding of the performance of different system designs and layouts under various weather conditions and occupants behaviour.
IEA ECBCS Annex 54 방법에 근거한 PVT-GSHP 시스템 경제성 평가 연구
박진우(Pak Jin-Woo),강은철(Kang Eun-Chul),이의준(Lee Euy-Joon) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.1
This study is to perform economic analysis of a PVT-GSHP(Photovoltaic Thermal-Ground Source Heat Pump)system compared to the conventional system which consists of a boiler and a chiller. This research has simulated, developed and analyzed four systems for application in a residential and an office building which was based on the hourly EPI(Energy Performance Index, kWh/m²yr). Case 1 includes a boiler and a chiller to meet heating and cooling demands for a house. Case2 is the same conventional system as Case1 for a office. Case 3 is simple summation of Case 1 and 2. And Case 4 is utilizing a PVT-GSHP to meet the combined loads of the house and office. The economic evaluation study was based on IEA ECBCS Annex 54 subtasks C economic assessment methods. This study indicated that PVT-GSHP system can save a building’s energy up to 53.9%. Also the SPB(Simple Payback) of the PVT-GSHP system with 0%, 50% initial incentive was 14.5, 6.7 year respectively.
철도시스템 공급자용 Systems Engineering(SE) 업무 개선방안 연구 - 부산김해경전철/김포도시철도 SE 수행사례 중심으로
박건영(Keon-Yeong Pak),양희갑(Hee-Kap Yang),백현(Hyun Baek),조항(Hang Cho),박진우(Jin-Woo Park) 한국철도학회 2020 한국철도학회 학술발표대회논문집 Vol.2020 No.7
국내 민자 철도사업 도입 초기, 철도시스템 분야에 본격 적용되기 시작한 시스템엔지니어링 (Systems Engineering, 이하 SE) 업무는 현재 국내 철도사업에서 다양한 형태로 활용 중에 있다. 하지만 현재 적용 중인 철도분야 SE 업무 방식은 각 현장별 특성(계약범위, 공급자 or 수요자 등)을 고려하지 않은 획일적인 업무 형태 및 절차로 인해, 철도현장에서 효과적인 SE 업무 수행에 오히려 걸림돌로 작용하는 경우가 종종 발생하고 있다. 이에 본 논문에서는 실제 수행된 철도 SE 실무 사례들을 검토하여 기존 SE 업무 방식의 문제점 및 철도시스템 공급자 측면에서 도움이 될 수 있는 개선방안을 고찰하고자 한다.
ISO/IEC15288 기술프로세스의 도시철도 시스템 적용방안 연구
박건영(Keon-Yeong Pak),양희갑(Hee-Kap Yang),박진우(Jin-Woo. Park) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
시스템엔지니어링(이하 SE) 관련 국제 표준 규격인 ISO/IEC 15288의 경우, 크게 4개의 프로세스로 구분되며 그 중 실무적인 SE 업무에 가장 밀접한 프로세스가 “기술프로세스”이다. 하지만 국내 철도현장에서 SE 실무 수행을 위해 실제 이 기술프로세스를 원칙적으로 적용하고자 할 때, 현장의 많은 문제점(계약조건, 제약환경, 비용 등)들로 인해 유명무실해지는 경우가 자주 있어 왔다. 본 논문에서는 도시철도 시스템의 SE 수행시 ISO/IEC 15288 기술프로세스를 적용할 때, 현장에서 발생하는 문제점 및 대안들을 김포도시철도 열차운행시스템의 아키텍처 설계 업무를 중심으로 검토 및 고찰하고자 한다. ISO/IEC 15288, Established by the International Standard group, has four processes for systems engineering(SE) activities. The “Technical Process”, which is one of four processes, is most closely related to the SE activities. But the many problems, for example contract conditions, cost and constraint environment etc., which SE engineers often are faced with have occurred when they ideally apply this process to Korean urban railway in the field. In this paper, We study the alternative method for these problems in applying the “Technical Process” of ISO/IEC 15288 by carrying out SE activities of the “Gimpo Subway Train Operation System”(GSTOS) architecture design in the field.
수출기업의 공급사슬관리가 공급자 네트워크 대응성과 제품혁신 및 시장접근시간에 미치는 영향에 관한 연구
최두원(Doo Won CHOI),박명섭(Myong Sop PAK),박진우(Jin Woo PARK) 한국무역상무학회 2016 貿易商務硏究 Vol.71 No.-
As the new competitive environment becomemore global, technologically oriented and customer driven, as customers continually demand higher quality, faster response, and greater reliability of products and services, the newglobal market demands a more customer responsive behaviour by companies and firms have responded with innovative products and improvedmanufacturing processes to manufacture products. Further, the shift from traditional manufacturing and purchasing to JIT manufacturing and purchasing requires customers and suppliers to shift from adversarial relationships to strategic partnerships, and information sharing, so as to attain flexibility, reliability, and speed. SCMpractices such as supplier collaboration and information sharing is considered as a key to attaining supplier network responsiveness and enhancing the product innovation and the market access time. The current research investigates the effect of SCM practices on supplier network responsiveness, the product innovation and the market access time of export companies. Thus by providing empirical evidence of the said relationships, this study offers useful guidelines formeasuring and improving the supplier network responsiveness of a firm, facilitating further research in the area.
한국산 잡견의 동소성 간이식술시 혈역학 및 전해질 변화
김영재,박진우,이경우,신치만,최영균,박명,박주열 대한마취과학회 1995 Korean Journal of Anesthesiology Vol.29 No.1
During orthotopic liver transplantation (OLT), changes of hemodynamic, electrolytes and acid-base balance are frequently occurred. These changes may influence mortality and prognosis during and after surgery. The purpose of this study was to observe and evaluate the changes of hemodynamics and electrolytes occurring in 14 cases canine OLT. After insertion of endotracheal tube, anesthesia was maintained with 1% enflurane and pancuronium bromide. Swan-Ganz catheter(7.5 Fr.) was inserted into right external jugular vein and 20 gauge angiocatheter was also inserted into left femoral artery. Complete hemodynamic variables and electrolytes were measured 30 minutes after skin incision, anhepatic stage, 5 minutes before reperfusion, 5 and 30 minutes after reperfusion. The results were as follows; On reperfusion of grafted liver, 9 cases(64%) showed postreperfusion syndrome. In 9 cases showing Postreperfusion syndrome, cardiac output, systemic vascular resistance, mean pulmonary arterial pressure were decreased and serum potassium concentration was increased on reperfusion, but there were no significant changes in central venous pressure, pulmonary capillary wedge pressure, heart rate, body temperature and serum ionized calcium concentration when comparing with before reperfusion. Decreased mean arterial pressure during reperfusion in postreperfusion syndrome might be speculated through decrease of myocardial contractility and systemic vascular resistance. (Korean J Anesthesiol 1995; 29: 27-35)
김정호,박진우,이창희,윤의박,안상곤 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.7
In this study, a two dimensional model for prediction of microsegregation in solidification was suggested on the basis of the previous one dimensional model. Especially, for the growth of a secondary arm, a simple and effective mathematical function was established to show the growing pattern. The solute diffusion in the solid phase was calculated by the finite difference method(FDM). The solid-liquid interface movement was considered to be in local equilibrium state indicated by the phase diagram. The experiments for an unidirectional solidification of Al-4.9wt.%Cu binary alloy were carried out in order to examine the reasonability and feasibility of this model. The concentration profile of solute and eutectic fraction predicted by the simulation agreed well with those found from experimental works. According to the results, it was believed that the pattern function introduced in this study was reasonable for the prediction of a microsegregation in dendritic growth.