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Park, Sangjune,Seo, Boram,Shin, Seohyun,Son, Jeong-Yu,Lee, Phil Ho The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.77
<P>Rhodium-catalyzed oxidative coupling reactions <I>via</I> C–H activation and annulation directed by phosphonamide and phosphinamide groups were developed under aerobic conditions, which produced benzazaphosphole 1-oxides and phosphaisoquinolin-1-oxides.</P> <P>Graphic Abstract</P><P>Rhodium-catalyzed oxidative coupling reactions <I>via</I> C–H activation and annulation directed by phosphonamide and phosphinamide groups were developed under aerobic conditions, which produced benzazaphosphole 1-oxides and phosphaisoquinolin-1-oxides. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc44995e'> </P>
Park, Sangjun,Cho, Jungkeun,Park, Jungsoo,Song, Soonho Pergamon Press 2017 Energy Vol.124 No.-
<P><B>Abstract</B></P> <P>The effect of methanol addition on the performance and NO<SUB>x</SUB> emission of a diesel engine was investigated using one-dimensional engine cycle simulation. The methanol component was injected into the intake manifold of a diesel engine at a certain energy fraction (0, 5, 10, or 15%) of the fuel. The in-cylinder pressure and temperature decreased as the methanol content increased due to the lower cetane number and lower heating value of methanol. The resulting decrease in the combustion efficiency lowered the NO<SUB>x</SUB> emission and brake thermal efficiency of the engine, and consequently deteriorated the brake specific fuel consumption (BSFC). The BSFC decreased but the NO<SUB>x</SUB> emission increased with advanced injection timing under dual-fuel operating conditions. Response surface plots of the BSFC and NO<SUB>x</SUB> emission as a function of the injection timing and exhaust gas recirculation (EGR) rate were obtained using a design of experiment method. The optimal Pareto fronts that improved both the BSFC and NO<SUB>x</SUB> emission were found. The EGR rate had a greater influence on the optimal Pareto front than the injection timing, which suggested that design parameters such as the injection timing and EGR rate could be used to control the performance and emission under various duel-fuel conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The performance and emission of a diesel-methanol dual-fuel engine is investigated. </LI> <LI> The BSFC of the diesel engine is deteriorated as the methanol content increased. </LI> <LI> The NOx emission of the diesel engine is reduced as the methanol content increased. </LI> <LI> Both the BSFC and NOx emission are improved by multi-objective Pareto optimization. </LI> <LI> Design parameters are suggested to control the performance of the dual-fuel engine. </LI> </UL> </P>
Park, Sangjune,Kim, Hyunseok,Son, Jeong-Yu,Um, Kyusik,Lee, Sooho,Baek, Yonghyeon,Seo, Boram,Lee, Phil Ho American Chemical Society 2017 Journal of organic chemistry Vol.82 No.19
<P>The Cu-catalyzed, formal aza-[3 + 2] cycloaddition reaction of pyridine derivatives with α-diazo oxime ethers in trifluoroethanol was used to synthesize imidazopyridines via the release of molecular nitrogen and elimination of alcohol. These methods enabled modular synthesis of a wide range of <I>N</I>-heterobicyclic compounds such as imidazopyridazines, imidazopyrimidines, and imidazopyrazines with an α-imino Cu-carbenoid generated from the α-diazo oxime ethers and copper.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/joceah/2017/joceah.2017.82.issue-19/acs.joc.7b01714/production/images/medium/jo-2017-01714z_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jo7b01714'>ACS Electronic Supporting Info</A></P>
Park, Sangjune,Yong, Woo-Soon,Kim, Sanghyuck,Lee, Phil Ho American Chemical Society 2014 ORGANIC LETTERS Vol.16 No.17
<P>The development of rhodium-catalyzed diastereoselective <I>N</I>-sulfonylaminoalkenylation of azulenes using <I>N</I>-sulfonyltriazoles is described. This procedure can be successfully applied to rhodium-catalyzed diastereoselective <I>N</I>-sulfonylaminoalkenylation of azulenes starting from terminal alkynes and <I>N</I>-sulfonylazides via a three-component semi-one-pot process.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2014/orlef7.2014.16.issue-17/ol502208w/production/images/medium/ol-2014-02208w_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol502208w'>ACS Electronic Supporting Info</A></P>
교통부문 미세먼지 배출 현황 및 주요 저감대책의 효과 평가
박상준(PARK, Sangjune),천승훈(CHUN, Seoung Hun),전민택(JEON, Min Taek) 대한교통학회 2017 대한교통학회 학술대회지 Vol.76 No.-
우리나라의 주기적인 고농도 미세먼지가 사회적 문제로 등장한 이래 정부는 미세먼지 저감을 위해 다양한 미세먼지 저감대책을 수립하고 많은 예산을 투입하였으나 아직까지 가시적인 성과는 나타나지 않고 있다. 미세먼지의 발생원인에 대해서는 명확한 정의가 내려져 있지 않지만 중국에서 유입되는 비율이 약 30~40% 정도이며 나머지는 국내에서 발생하고 있는 것으로 추산되며 국내 발생요인으로는 이견이 있으나 교통부문 중 도로에서 약 25%가 발생하고 있다. 특히 도로부문 미세먼지의 주 원인으로 지목된 경유차의 규제와 관련한 다양한 정책이 제시되었으나 경유차 규제로 인한 미세먼지 저감 효과를 객관적으로 평가한 자료는 구축되어 있지 않다. 이러한 측면에서 본 연구는 경유차의 미세먼지 저감효과를 객관적으로 평가하여 저감대책의 효과를 추정하였다. 저감대책 평가대상은 수도권에 등록된 10년 이상 노후경유차 중 저공해화 장치(DPF) 부착이 가능한 차량을 대상으로 미세먼지 저감효과를 산정하였고 DPF 장착으로 저감된 미세먼지 감축에 대한 추정량을 연간 미세먼지로 인한 피해금액으로 환산하여 저감대책의 효과평가가 계량적으로 이루어질 수 있도록 하였다.
Study for the Power Characteristic of NREL Phase VI Blade considering Wind Shear
박상준(Park, Sangjun),이경세(Lee, Kyungseh),김영찬(Kim, Youngchan),박현철(Park, Hyunchul) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
As rotor blade of a wind turbine becomes larger to satisfy the economic efficiency for offshore wind farm, the numerical analysis considering wind profile is getting emphasized. In this paper, the study for the power characteristic of a wind turbine is carried out using NREL phase VI wind turbine applied wind profile. The experimental data of NASA Ames wind tunnel for inflow velocity 7m/s is used and the numerical result is obtained by using CFD commercial solver(FLUENT).