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Effective parameters for DME steam reforming catalysts for the formation of H2 and CO
Sungyong Park,Hwanam Kim,Byungchul Choi 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.5
Recently, DME has received attention as a clean fuel and is now considered an alternative fuel for diesel engines. DME diesels need de-NOx catalysts such as LNT (Lean NOx Trap) and SCR (Selective Catalytic Reduction) systems. DME is an attractive source of hydrogen because it can be stored easily and is a good transportation fuel. Hydrogen and CO enriched gas as a reductant was used with the LNT catalyst in order to reduce NOx emissions. The steam reforming catalyst of DME was used to formation of hydrogen. It has been reported that Cu-based catalysts have high selectivity and activity in the steam reforming of DME. This research used 600 cPsi cordierite as a catalyst, which was coated with copper. The catalysts were made via a sol–gel and impregnation methods. The formation of H2 and CO under the prepared catalysts was tested by a model gas. Experimental parameters were considered; the space velocity (SV) and concentrations of H2O, O2, and CO2 were evaluated. The Cu 30%/g-Al2O3 catalyst from the sol–gel method exhibited high and stable activity in the production of hydrogen from the steam reforming of DME. Both DME conversion and the selectivity of hydrogen were affected by SV and the concentrations of H2O, O2,and CO2. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Zero-Shot Transfer Learning of a Throwing Task via Domain Randomization
Sungyong Park,Jigang Kim,H. Jin Kim 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
Deep reinforcement learning (DRL) on continuous robot control has received a wide range of interests over the last decade. Collecting data directly from real robots results in high sample complexities and can cause safety accidents, so simulators are widely used as efficient alternatives for real robots. Unfortunately, policies trained in the simulation cannot be directly transferred to real-world robots due to a mismatch between the simulation and the reality, which is referred to as ‘reality gap’. To close this gap, domain randomization (DR) is commonly used. DR guarantees better transferability in the zero-shot setting, i.e. training agents in the source domain and testing them on the previously unseen target domain without fine-tuning. In this work, we identify the positive influence of DR on zero-shot transfer between the sim-to-sim setting with an object throwing task.
주행시 각 영역 별 시인 비율 도출 : 아이트랙커를 통한 안구운동추적
Sungyong Ahn,Kyuhwan Lee,Poem Park,Yongwook Jeon,Sangkyu Kim,Jungpil Choi 대한인간공학회 2011 대한인간공학회 학술대회논문집 Vol.2011 No.5
The visibility of automotive is one of the most important factors because it is related to driving accidents. Each part of visibility range is enormous factor in a real driving. In this research, visual behaviors were evaluated on each section (straight, left-turns, right-turns, parking lot, etc.) with an eye-tracker. The percentiles to each range of previous studies and for-area visions were deducted. As the results of this research, the front view of a valid view appeared high percentile in straight sections, right and left turns showed regular percentile in front and side view based on A-pillar.
박성용(Sungyong Park),김화남(Hwanam Kim),최병철(Byungchul Choi) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.2
HCCI 엔진은 배출가스 중 PM과 NOx 가 저감되나, 일반적으로 상용디젤 엔진보다 HC, CO 가 증가하는 특성을 보인다. 특히 과도한 HC 에서 발생하는 SOF 로 인해 total PM 에 영향을 미친다. 이는 HCCI 엔진에서 DOC 를 통한 HC 저감이 중요하며 HC 의 정화성능이 우수한 OC 의 개발이 필요하다. 실험은 모델가스를 이용하여 2Pt/1Pd 의 충전량이 다른 3 종의 OC(600cpsi cordierite)를 가지고 수행하였다. OC 에서 HC, SV, H₂O, O₂의 조건을 달리하여 OC 성능특성을 LOT50에서 평가하였다. 그 결과 CO 는 170℃에서 3 종의 촉매 모두 90% 이상의 정화특성을 나타내었고 Pd 가 충전 된 OC 는 열화 된 후 Pt 만충전 된 OC 보다 우수한 내구특성을 나타내었다. Fresh 와 aged 된 OC 에서 SV 의 증가 및 H₂O 의 반응참여는 LOT50성능이 낮아지는 결과를 나타내었다. The Homogeneous Charge Compression Ignition (HCCI) engine concept allows for both NOx and particulate matter to be reduced simultaneously, and it is a promising way to meet the next environmental challenges. Unfortunately, HCCI combustion often increases CO and HC emissions. The development of oxidation catalyst (OC) requires high conversion efficiency for CO and HC at low temperature. Conventional oxidation catalyst technologies may not be able to convert these emissions because of the saturation of active catalytic sites. The OC used in this study was 600 cpsi cordierite. Three kinds of OC with different amounts of Pt and Pd were used. The influence of the space velocity (SV), H₂O and O₂ concentration was also studied. All types of OCs were found to have over 90% CO conversion efficiencies at 170℃. When in the presence of water vapor, CO conversion was increased, but C₃H? conversion was decreased. The performance of the OC was not influenced by initial the HC concentration. The 2Pt/Pd catalyst was better in terms of thermal aging than the Pt-only catalyst. The LOT50 of both fresh and aged OC was increased with increasing SV and with the presence of H₂O.
박성용 ( Sungyong Park ) 한국협동조합학회 2010 韓國協同組合硏究 Vol.28 No.1
The Consumer Co-op Law was enacted in 1998 with incorporated with not a few problems mainly due to the social and economic environments at that time. Based on the reason, there has been sustaining request for the revision of the law from the establishment. Finally, The Consumer Co-op Law revised completely passed the National Assembly in Feb. this year and will come into effect on after six months. This study is composed of 3 main contents. First, this study presents the problems of current law mainly with business contents, principal of consumer co-operative, organization system, government supports and so on. Secondly, suggest the way for them to discuss specifically how to revise it. Finally, set forth the essential points the contents of revision law and proposal the future tasks of the consumer co-operative.