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JongHeun Jun,KyoSeung Lee,SoonHo Song,KwangMin Chun 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Stringent emission regulations are being proposed with growing concern on NOx and PM emissions from diesel engines. Future emission regulations require an advanced emission control technology. Exhaust gas recirculation (EGR) is a commonly used technique to reduce NOx emission. In this paper, a model-based investigation was conducted to compare the effect of high pressure loop (HPL) EGR and low pressure loop (LPL) EGR system on NOx level and BSFC of a heavy-duty diesel engine. A WAVE model was created to simulate EURO 3 engine and each component of the engine was modeled using CATIA and WaveMesher. A previous study on a LPL EGR system is compared with a HPL EGR system using a variable geometry turbocharger (VGT). In order to clarify the effect of HPL and LPL EGR system on NOx level and fuel economy, increased intake manifold temperature and pumping loss are discussed.
Mukherjee, Biswanath,Sim, Kyoseung,Shin, Tae Joo,Lee, Junghyun,Mukherjee, Moumita,Ree, Moonhor,Pyo, Seungmoon The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.7
<P>High quality, single crystalline, ordered arrays of a π-conjugated organic molecule, <I>N,N′</I>-dioctyl-3,4,9,10-perylene tetracarboxylic diimide (PTCDI-C<SUB>8</SUB>), were grown by solution processing and used to fabricate a low-cost, high-performance organic phototransistor (OPT). The single crystalline nature of the microstructure was investigated using 2D-GIXD measurement. The organic field-effect transistor fabricated using periodic arrays of elongated crystals exhibited a photoresponsivity (<I>P</I>) of <I>ca.</I> 1 A W<SUP>−1</SUP> and a photo to dark current ratio (<I>I</I><SUB>on</SUB>/<I>I</I><SUB>off</SUB>) of 2.5 × 10<SUP>3</SUP> at <I>V</I><SUB>G</SUB> = 12 V and a maximum <I>P</I> of <I>ca.</I> 7 A W<SUP>−1</SUP> at the high gate bias regime (<I>V</I><SUB>G</SUB> = 50 V) with an optical power of <I>ca.</I> 7.5 mW cm<SUP>−2</SUP>. With polymeric gate dielectric, the OPT exhibited very stable n-type characteristics both in the dark and under light illumination and showed reproducible photo-switching behavior. The dependence of the photocurrent on the gate/drain voltage and on illumination intensity provided an effective way to control the number of photo-carriers generated in the active material, enabling the precise tuning of the device's performance. Performance comparison between OPTs with ordered crystal arrays and thin films of PTCDI-C<SUB>8</SUB> confirmed that the material's intrinsic properties were better realized in the crystalline device, presumably because of higher charge carrier mobility and better charge transport capability. This one-step, solution-based, self-assembly fabrication of multifunctional (photodetection, photoswitching, signal amplification) optoelectronic devices has potential to aid the development of organic semiconductors with high-quality micro/nanostructures for large-scale application and low-cost optoelectronic devices.</P> <P>Graphic Abstract</P><P>An organic phototransistor (OPT) was fabricated using solution grown, periodic arrays of PTCDI-C<SUB>8</SUB> single crystals. The OPT exhibited high photosensitivity (7 A W<SUP>−1</SUP>), high on/off current ratio (2.5 × 10<SUP>3</SUP>) and reproducible photo-switching at low optical power. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm14179e'> </P>
[디젤엔진부문] AC 코로나 방전에 의한 디젤 입자상 물질의 산화 반응
김필승(Pilseung Kim),이교승(Kyoseung Lee),황정호(Jungho Hwang) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
A commonly accepted method of reducing the emission of soot particles from diesel engines is to use particulate traps. They must be regenerated from time to time, usually by combustion of the soot deposit. Research studies carried out in the late 1990's indicate that diesel particulates can be oxidized using NTP. The intent in using a NTP is to selectively transfer the input electrical energy to the electrons. The electron energy distribution in the plasma reactor determines the types of radicals produced in the plasma The diesel particulates can be effectively oxidized by some reactive species generated in plasma, such as a and OH radicals. Especially, this study is focused on the effects of a radicals reaction to diesel particulate matters
Mukherjee, Biswanath,Shin, Tae Joo,Sim, Kyoseung,Mukherjee, Moumita,Lee, Junghyun,Kim, Sung Hoon,Pyo, Seungmoon Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.41
<P>Periodic arrays of highly oriented 7,7,8,8-tetracyanoquinodimethane (TCNQ) crystals, directly grown on a polymeric gate dielectric through a solution process, are used for the fabrication of a low-voltage organic field-effect transistor (OFET). Consequently, an organic complementary inverter using the TCNQ periodic array (<I>n</I>-channel) and pentacene (<I>p</I>-channel) is also reported. The TCNQ-based <I>n</I>-channel OFET exhibited very stable field-effect characteristics with low operational (2 V) and threshold voltages (<0.5 V). The highest field-effect carrier mobility in the saturation region was found to be 0.03 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>. Furthermore, the organic complementary inverter showed good response characteristics in the low-voltage regime. The swing range of <I>V</I><SUB>OUT</SUB> is same as <I>V</I><SUB>DD</SUB>, ensuring “zero” static power consumption in the digital logic circuit. For the inverter with <I>V</I><SUB>DD</SUB> = 2 V, the noise margin for low and high voltages are 1.0 V and 0.3 V, respectively. The logic threshold (<I>V</I><SUB>IN</SUB> = <I>V</I><SUB>OUT</SUB>) is 1.3 V and the maximum gain (−d<I>V</I><SUB>OUT</SUB>/d<I>V</I><SUB>IN</SUB>) of 4 is obtained at <I>V</I><SUB>IN</SUB> = 1.3 V.</P> <P>Graphic Abstract</P><P>A novel method to produce an ordered organic crystalline array and its use in fabricating high-performance low voltage OFET has been demonstrated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm01220c'> </P>
대형 디젤엔진에서의 Low Pressure Loop EGR 적용을 위한 기초연구
하창현(Changhyun Ha),이승재(Seungjae Lee),이교승(Kyoseung Lee),김상호(Sangho Kim),전광민(Kwangmin Chun) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is known that low pressure loop EGR is one of the best way to improve DeNOx efficiency and EGR distribution. This study is about applying low pressure loop EGR to an engine that was not equipper with EGR system. The goals of this study are to achieve 30% of maximum EGR rate and well distribution of EGR flow to meet more stringent emission standard. To validate the simulation model, experimental data of baseline engine without EGR system and simulation results using I-D WAVE code and 3-D VECTIS code are compared for ESC-13 mode. <br/> The result is satisfactory in ±5% error bound. For applying low pressure loop EGR, optimum EGR pipe diameter was 30mm which was about 30% of intake pipe diameter. In case of applying low pressure loop EGR system, DeNOx efficiency was about 60~80% and cylinder-to-cylinder EGR rate deviation was within 5%. However, HC emission was increased to 55%. <br/>