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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.
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.
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.
Thermal aging DME 개질 촉매에서 생성된 수소가 DME 자동차의 de-NOx 성능에 미치는 효과
박성용(Sungyong Park),최병철(Byungchul Choi),김화남(Hwanam Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The purpose of this study is to observe the effects of the mixing promoters to the Cu/r-Al₂O₃ catalyst to improve H₂ generation depending on thermal aging through the exhaust gases of DME engines, and to identify the effects on de-NOx performance using H₂ generated from SR catalyst in the LNT. The SR catalyst was prepared by the sol-gel method with promoter and the LNT used commercial catalyst. The kinds of promoter are Zn, and Ce. The amounts of promoter are 1% of amount of Cu and r-Al₂O₃ mixed. As a result of experiments, Cu29CeO21/r-Al₂O₃ showed the highest H₂ yield compared to the other SR catalysts in a fresh, and 900 ℃ aged conditions. Cu29CeO₂1/r-Al₂O₃ showed that mixing of 1% of CeO₂ improved the dispersion of Cu and increased the surface area of Cu. In the combined system of SR and LNT catalyst using the Cu29CeO₂1/r-Al₂O₃ with Ce 1% as a promoter, it showed the performance of the NOx conversion improved 8-13% compared to the LNT alone.