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과급된 직접분사식 가솔린 엔진에서의 과도응답 특성 및 경량 TiAl 터빈 휠의 효과 분석
정진영(Jinyoung Jung),박찬수(Chansoo Park),배충식(Choongsik Bae) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
다운사이징 엔진은 대 배기량 자연흡기엔진 대비 연비가 우수하지만 가속운전조건에서 응답성이 떨어져 이를 향상시키려는 많은 연구가 진행 중이다. 본 연구에서는 다운사이징 엔진을 대상으로 기존 Inconel 재질의 터빈 휠과 TiAl 재질의 경량 터빈 휠의 응답성을 과도응답조건에서 비교하였다. TiAl 터빈 휠은 회전관성이 Inconel 대비 작아 과급에 필요한 터빈 회전속도에 도달하는 시간이 상대적으로 짧아 과급 압력이 빠르게 증가하는 등 과도응답조건에서의 응답성이 개선되었다. In this study, performance tests were conducted under transient operation conditions in a turbocharged gasoline direct injection engine. In order to improve transient response, which is one of drawbacks of downsized engines, TiAl turbine wheel was evaluated compared with conventional Inconel turbine wheel. The inertia of TiAl turbine wheel is lower than that of Inconel one. Therefore, transient response was improved with TiAl turbine wheel because of that turbocharger speed of TiAl turbocharger was increased faster compared to Inconel turbocharger.
상분리 혐기성공정에 의한 양돈폐수로부터 고순도 메탄회수
정진영(Jinyoung Jung),정윤철(Yunchul Chung),유창봉(Changbong Yoo) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
The purpose of this study is to investigate the performances of organic removal and methane recovery in the full scale two-phase anaerobic system. The full scale two-phase anaerobic system was consists of an acidogenic ABR (Anaerobic Baffled Reactor) and a methanognic UASB (Upflow Anaerobic Sludge Blanket) reactor. The volume of acidogenic and methanogenic reactors is designed to 28.3 m3 and 75.3 m3. The two-phase anaerobic system represented 60-82% of COD removal efficiency when the influent COD concentration was in the range of 7,150 to 16,270 mg/L after screening (average concentration is 10,280 mg/L). After steady-state, the effluent COD concentration in the methanogenic reactor showed 2,740 ± 330 mg/L by representing average COD removal efficiency was 71.4 ± 8.1% when the operating temperature was in the range of 19-32oC. The effluent SCOD concentration was in the range of 2,000-3,000 mg/L at the steady state while the volatile fatty concentration was not detected in the effluent. Meanwhile, the COD removal efficiency in the acidogenic reactor showed less than 5%. The acidogenic reactor played key roles to reduce a shock-loading when periodic shock loading was applied and to acidify influent organics. Due to the high concentration of alkalinity and high pH in the effluent of the methanogenic reactor, over 80% of methane in the biogas was produced consistently. More than 70 % of methane was recovered from theoretical methane production of TCOD removed in this research. The produced gas can be directly used as a heat source to increase the reactor temperature.
비적정주거 임대상품의 재생산 메커니즘: 서울시 (반)지하, 고시원, 쪽방을 사례로
정진영 ( Jung Jinyoung ) 한국도시지리학회 2021 한국도시지리학회지 Vol.24 No.3
이 연구는 비적정주거가 임대상품으로 어떻게 재생산되는가를 밝힌다. 연구결과를 요약하면 다음과 같다. 첫째, 임대상품과 자산으로서의 이중적 성격은 비적정주거를 재생산시키는 기제로 작동한다. 시간이 지남에 따라 비적정주거는 임대상품에서 재개발, 재건축 이익을 기대할 수 있는 자산으로 변화하며 임대인은 새로운 이윤 창출의 기회를 획득한다. 이때 주택의 비적정함은 자산으로서의 가치가 실현될 근거로 자리한다. 둘째, 임대인의 상대적 빈곤은 비적정 주거 재생산의 동력이 된다. 기업형 임대인부터 수급자까지 다양한 사람들이 비적정 주거의 공급에 관여하며, 이는 임차인의 빈곤뿐만 아니라 임대인의 상대적 빈곤까지도 비적정 주거 재생산의 기제로 작동함을 보여준다. 종합하면 집을 통한 이윤 창출이 보편화 된 상황에서 임대인의 빈곤과 주택의 비적정성 그 자체까지도 비적정주거의 재생산에 공모한다는 것이다. This study examines the mechanism by which inadequate housing is produced as a rental commodity. The dual nature of inadequate housing as rental products and assets and the diversity of landlords operate as a mechanism for these housing being reproduced. With time, inadequate housing has changed from rental commodities to assets with investment potential. In the early stages, rent was the main profit for the owner, but the value as a rental commodity gradually decreased. At the same time, its value as an asset continued to increase due to the possibility of reconstruction. This value as an asset is then, one of the key reasons for the reproduction of inadequate houses despite the increasing poor quality of the house. Concurrently, the diverse spectrum of the landlord rangin from the entrepreneurial landlord through to the subsistence landlord, are also involved in the production of inadequate houses. This implies that, not only the poverty of tenants but also the relative poverty of landlords, can be the driving force of re-production. These findings suggest that with wide-spread profiting through housing, the poverty of landlords and inadequacy itself function as nut and bolt of inadequate housing reproduction.