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LPG 직분 연료 공급 시스템에서 연료 리턴에 의한 연료 냉각효과 연구
이정호(Jeongho Lee),이종혁(Jonghyeok Lee),이충근(Chunggeun Lee),이진학(Jinhak Lee),이대엽(Daeyup Lee) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In order to meet the emissions standards for PM and PN, a development of technology for LPG SIDI(Spark Ignition Direct Injection) fuel supply system and for its application are necessary. Prevention of a vapor lock with use of LPG fuel leads to begin this work. The purpose of this work is to provide optimum design methods for preventing the locking of the fuel vapor from the LPG fuel supply system, and contributes to construction of the designed data. An effect of fuel cooling by returning some fuel from the high pressure pump to the fuel tank is identified using a rig system with Butane/propane= 70%/30% fuel, which enables to estimate the increase of temperature to slow down up to max. 1.4 times. As returning amount of fuel increases, an effect of cooling fuel pump varies and thus an excessive use of low pressure pump leads to the durability and fuel economy problems. Therefore, this work suggests the variable control of returning amount of fuel needs to be reviewed and applied. Measured results of temperature change of high pressure pump show that, after heating to high temperature, it is confirmed that a start of return(opening of return valve) lowers(cools) the temperature of high pressure pump. This concludes that low pressure pump(in-tank motor) enables to cool down the high pressure pump and thus reduce the start time at high temperature re-startability.
Lee, Chan-Young,Jeong, Junyeong,Han, Jeongho,Lee, Seung-Joon,Lee, Sukjin,Lee, Young-Kook Elsevier 2015 ACTA MATERIALIA Vol.84 No.-
<P><B>Abstract</B></P> <P>The deformation mechanism of a medium-Mn lightweight steel with an inhomogeneously grained structure of austenite was investigated as a function of annealing temperature. All annealed specimens exhibited three different phases: γ-austenite, δ-ferrite and α′-martensite. Specimens annealed at temperatures below 1000°C exhibited high strain-hardening rates (SHRs) and good combinations of ultimate tensile strength and ductility (∼35,000–37,000MPa%) due to the sequential occurrence of transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) during tensile deformation. The SHR–true strain curves of the annealed specimens are divided into four different stages: dynamic recovery of dislocations (stage I), active TRIP (stage II), slow TRIP (stage III) and mechanical twinning (stage IV). However, the specimen annealed at 1000°C did not exhibit stage IV, most likely due to its coarse grain size. Whereas the TRIP occurred in coarse γ-austenite grains at small tensile strains, the TWIP took place in fine γ-austenite grains with a size of less than ∼10μm at large tensile strains. This result indicates that grain refinement induced the transition in deformation mechanism from the TRIP to the TWIP. The inhomogeneously grained structure of γ-austenite in the annealed specimens consists of coarse grains pre-existing in the hot-rolled state and fine grains newly formed during annealing.</P>
Assurance of mitochondrial integrity and mammalian longevity by the p62-Keap1-Nrf2-Nqo1 cascade
Kwon, Jeongho,Han, Eunhye,Bui, Chi‐,Bao,Shin, Woochul,Lee, Junho,Lee, Sejeong,Choi, Young‐,Bong,Lee, Ann‐,Hwee,Lee, Kyong‐,Hoon,Park, Chankyu,Obin, Martin S,Park, Sung Kyu,Seo, EMBO 2012 EMBO reports Vol.13 No.2
High Throughput Ultralong (20 cm) Nanowire Fabrication Using a Wafer-Scale Nanograting Template
Yeon, Jeongho,Lee, Young Jae,Yoo, Dong Eun,Yoo, Kyoung Jong,Kim, Jin Su,Lee, Jun,Lee, Jeong Oen,Choi, Seon-Jin,Yoon, Gun-Wook,Lee, Dong Wook,Lee, Gi Seong,Hwang, Hae Chul,Yoon, Jun-Bo American Chemical Society 2013 Nano letters Vol.13 No.9
<P>Nanowires are being actively explored as promising nanostructured materials for high performance flexible electronics, biochemical sensors, photonic applications, solar cells, and secondary batteries. In particular, ultralong (centimeter-long) nanowires are highly attractive from the perspective of electronic performance, device throughput (or productivity), and the possibility of novel applications. However, most previous works on ultralong nanowires have issues related to limited length, productivity, difficult alignment, and deploying onto the planar substrate complying with well-matured device fabrication technologies. Here, we demonstrate a highly ordered ultralong (up to 20 cm) nanowire array, with a diameter of 50 nm (aspect ratio of up to 4 000 000:1), in an unprecedented large (8 in.) scale (2 000 000 strands on a wafer). We first devised a perfectly connected ultralong nanograting master template on the whole area of an 8 in. substrate using a top-down approach, with a density equivalent to that achieved with e-beam lithography (100 nm). Using this large-area, ultralong, high-density nanograting template, we developed a fast and effective method for fabricating up to 20 cm long nanowire arrays on a plastic substrate, composed of metal, dielectric, oxide, and ferroelectric materials. As a suggestion of practical application, a prototype of a large-area aluminum wire grid polarizer was demonstrated.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2013/nalefd.2013.13.issue-9/nl400209n/production/images/medium/nl-2013-00209n_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl400209n'>ACS Electronic Supporting Info</A></P>
Han, Jeongho,Lee, Seung-Joon,Lee, Chan-Young,Lee, Sukjin,Jo, Seo Yeon,Lee, Young-Kook Elsevier 2015 Materials science & engineering. properties, micro Vol.633 No.-
<P><B>Abstract</B></P> <P>The size effect of <I>α</I>′ martensite constituents before annealing on the microstructure and tensile properties of intercritically annealed medium Mn steel was systematically investigated. The cold-rolled Fe–9Mn–0.05C (wt%) steel was austenized at three different temperatures, water-quenched to room temperature to vary the sizes of the martensite constituents, and then annealed at 640°C for 10min. When the austenizing temperature increased, the sizes of the prior austenite (<I>γ</I>) grains and of the packets and blocks of <I>α</I>′ martensite increased; however, the width of the laths changed only insignificantly. The annealed specimens had a dual-phase microstructure with lath-shaped ferrite (<I>α</I>) and retained <I>γ</I> (<I>γ</I> <SUB> <I>R</I> </SUB>) phases. The volume fraction of <I>γ</I> <SUB> <I>R</I> </SUB> decreased with increasing austenizing temperature because the specimen austenized at the higher temperature underwent a slower reverse transformation in the early stage of intercritical annealing. The slowed kinetics of the reverse transformation with increasing austenizing temperature was attributed to the reduction in area of block boundaries which provide nucleation sites for the reverted <I>γ</I>. The widths of the <I>α</I> and <I>γ</I> <SUB> <I>R</I> </SUB> laths were almost independent of the austenizing temperature. The partitioning of Mn and C atoms from <I>α</I> into <I>γ</I> <SUB> <I>R</I> </SUB> laths became active with increasing austenizing temperature, resulting in a more stable <I>γ</I> <SUB> <I>R</I> </SUB>. The specimen austenized at higher temperature exhibited a lower strain hardening rate (SHR) due to the less active transformation-induced plasticity (TRIP) in <I>γ</I> <SUB> <I>R</I> </SUB> with the higher phase stability. The ultimate tensile strength decreased with increasing austenizing temperature because the SHR was lowered by the less active TRIP with increasing austenizing temperature. The uniform elongation increased with increasing austenizing temperature due to delayed necking caused primarily by the flow stress, which dropped with increasing austenizing temperature.</P>
SeongSu Lee,JeongSeok Seo,SungRae Kim,JoEun Jeong,BeomWoo Nam,JuYul Lee,HeeJin Lee,Chul Lee,ChangUk Lee,InHo Paik,JeongHo Chae,SookHee Chai,SoonJib Yoo,WangYoun Won,DaiJin Kim 대한신경정신의학회 2011 PSYCHIATRY INVESTIGATION Vol.8 No.2
Objective-Our aim was to evaluate the changes in blood glucose control and lipid profiles after 2-months of smoking cessation in healthy males. Methods-Smoking abstinence was evaluated through self-report and urine cotinine levels. 12 individuals who succeeded in quitting smoking were analyzed. Fasting values of glucose and insulin were used to estimate the β-cell activity and insulin resistance was evaluated using the Homeostasis Model Assessment (HOMA) and Quantitative Insulin Sensitivity Check Index (QUICKI). Results-The data showed that the subjects had a significant increase in weight, body mass index and fasting plasma glucose levels after smoking cessation. The HOMA-Insulin Resistance and the HOMA β-cell function increased significantly (p=0.005, p=0.047 respectively). The QUICKI showed a significant decrease (p=0.005). In addition, the low-density lipoprotein cholesterol levels decreased significantly (p=0.028); however, changes in the high-density lipoprotein cholesterol, the triglyceride and total cholesterol levels were not significant (p=0.284, p=0.445 respectively). Conclusion-During the initial stage of smoking abstinence, insulin resistance increased and insulin sensitivity decreased due to elevated body weight and fat composition. Therefore, it is important to educate individuals that stop smoking about the necessity of weight control during smoking cessation programs.
이정호(Jeongho Lee),이성환(Seongwhan Lee),이정규(JungKyu Lee),이효정(Hyojeong Lee),신재혁(Jehyuck Shin),정선영(Seonyeong Jeong),오영석(YoungSeok Oh),진호(Ho Jin) 한국항공우주학회 2016 韓國航空宇宙學會誌 Vol.44 No.4
SIGMA(Scientific cubesat with Instruments for Global Magnetic field and rAdiation) 큐브위성은 근 지구 자기장 세기와 우주 방사선량 측정을 위해 경희대학교에서 개발한 초소형인공위성이다. 우주 임무 수행을 위해 비행 소프트웨어는 위성을 제어하고 데이터를 처리하는 중요한 역할을 담당한다. 본 연구에서는 SIGMA 큐브위성의 임무 수행을 위해 비행소프트웨어를 구현한 것으로서 일반적으로 임베디드 시스템에서 사용하는 실시간 운영체제를 사용하지 않고 단일 프로세스 내에서 모든 태스크를 처리하도록 구현하였다. 이는 SIGMA 큐브위성의 임무 수행 절차와 시스템 제어 방법을 고려한 것으로서 소프트웨어의 오버헤드(overhead)를 낮추고 임무 수행에 집중할 수 있는 효과적인 방법이다. SIGMA(Scientific cubesat with Instruments for Global Magnetic field and rAdiation) CubeSat has been developed for magnetic field measurement of the Earth and space radiation measurement at Kyung Hee university. The flight software plays important roles in controlling the satellite and processing the data in the space mission. In this paper, the Flight Software has been implemented to process all the tasks in the one thread without RTOS(Real Time Operating System). This is an effective mothed not only to concentrate the space mission of CubeSat but also to reduce the overhead of the Flight Software by considering the mission perform procedures and the system control methods.
이충근(Chunggeun Lee),이정호(Jeongho Lee),이한홍(Hanhong Lee),손민호(Minho Son),이대엽(Daeyup Lee) 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.4
As the mass production and mass consumption industries are settled, they are promoting depletion of natural resources and causing the problem of global warming. Therefore, various studies are under way to pursue resource utilization and environmental protection at the same time. In Europe and the United States, the remanufacturing industry, which was settled early, has emerged as an alternative industry to mitigate resource and environmental problems. In this research after using a diesel engine, the engine parts were restored just before disposal. The cylinder block was selected according to weight and economic value. The mass of the selected cylinder block is about 246 kg. When the worn parts were restored, the restoration process used about 200 g of mass. as the result of restoration process, weight 246 kg cylinder block was prolonged the lifetime by using 200g.