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류정호(Jungho Ryu),엄명도(Myoungdo Eom),권상일(Sangil Kwon),임철수(Cheolsoo Lim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In Rio de Janeiro in June 1992, The around world adapt convention on climate change which indicated to start international effort for prevention of greenhouse. According to agree the obligatory reduction of greenhouse gas specified Gyoto protocol, Our country which is 10th of the world in greenhouse gas emission, member of OECD wilt be pressured to reduce greenhouse gas. In this study in order to prepare obligatory reduction measure estimated the greenhouse gas emission factor and emission from automobile which is basic data to make emission statistics by Tier 3 method. To estimate greenhouse gas emission characteristics from automobile, greenhouse gas emission from was measured using driving pattern. CO₂, N₂O, CH₄ emission of passenger cars and light duty diesel vehicles were evaluated on chassis dynamometer for the cars selected by fuel, manufacturer, model year, displacement and CO₂, N₂O, CH₄ emission of heavy duty diesel engines were evaluated on engine dynamometer for the engine selected by manufacturer and production year.
상온 분사 공정에 의한 산화물전도 입자 복합 하이브리드 NTC 서미스터 필름의 제작 및 특성
강주은,류정호,최종진,윤운하,김종우,안철우,최준환,박동수,김양도,Kang, Ju-Eun,Ryu, Jungho,Choi, Jong-Jin,Yoon, Woon-Ha,Kim, Jong-Woo,Ahn, Cheol-Woo,Choi, Joon Hwan,Park, Dong-Soo,Kim, Yang-Do 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.1
Negative-temperature coefficient (NTC) thermistors based on nickel manganite spinel ($NiMn_2O_4$) are widely used for many applications, such as sensors and temperature compensators, due to their good thermistor characteristics and stabilities. However, to achieve thermistors with a high NTC B constant, which is an important figure of merit pertaining to the degree of temperature sensitivity, the activation energy should be high such that high resistivity at ambient temperatures results. To obtain a high B constant and low resistivity, Al and Si modified spinel structured $Ni_{0.6}Si_{0.2}Al_{0.6}Mn_{1.6}O_4$ hybrid thick films with the conducting metal oxide of $LaNiO_3$ were fabricated on a glass substrate by aerosol deposition at room temperature (RT). The NTC-$LaNiO_3$ hybrid thick films showed resistivity as low as < $100k{\Omega}\;cm$ at $90^{\circ}C$, which is one or two orders of magnitude lower than that of the monolithic NTC films, while retaining a high B constant of $NiMn_2O_4$ of over 5500 K when 20 wt% $LaNiO_3$ was added without a post-thermal treatment. These phenomena are explained by the percolation threshold mechanism.
압전 폴리머를 접목한 초전-자기-압전 발전소자의 출력 특성 향상 연구
백창민,이건,류정호,Chang Min Baek,Geon Lee,Jungho Ryu 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.6
Energy harvesting technology, which converts wasted energy sources in everyday life into usable electric energy, is gaining attention as a solution to the challenges of charging and managing batteries for the driving of IoT sensors, which are one of the key technologies in the era of the fourth industrial revolution. Hybrid energy harvesting technology involves integrating two or more energy harvesting technologies to generate electric energy from multiple energy conversion mechanisms. In this study, a hybrid energy harvesting device called TMPPEG (thermo-magneto-piezoelectric-pyroelectric energy generator), which utilizes low-grade waste heat, was developed by incorporating PVDF polymer piezoelectric components and optimizing the system. The variations in piezoelectric output and thermoelectric output were examined based on the spacing of the clamps, and it was found that the device exhibited the highest energy output when the clamp spacing was 2 mm. The voltage and energy output characteristics of the TMPPEG were evaluated, demonstrating its potential as an efficient hybrid energy harvesting component that effectively harnesses low-grade waste heat.
소형승합차량 및 RV차량의 유해대기오염물질(HAPs) 배출특성에 관한 연구
엄명도(Myungdo Eom),류정호(Jungho Ryu),유영숙(Youngsook Lyu),강대일(Daeil Kang),김종춘(Jongchoon Kim),박용희(Yonghee Park),김대욱(Daewook Kim),정성운(Sungwoon Jung) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hazardous air pollutants(HAPs) are emitted from motor vehicles are known or suspected to have serious health effect. However, we don't have any regulation or standard related to HAPs from mobile source so far. Now HAPs control strategies are highly needed and must to be conducted research and analysis on mobile source. This study focus on the investigation of the characteristics of exhaust emission and estimate the HAPs emission factors in light duty diesel and LPG vehicle. Sampling and analytical methods to be settled in 2004 were used. EPA TO-14 method(Toxic Organic), TO-11A method, CARB SOP 028 method(California Air Resource Board Standard Operating Procedure) and Korean air pollution measurement methods were chosen for VOCs, Aldehydes, PAHs and metals respectively. These results will provide some information on the characteristics of HAPs from mobile source and be used for proper decision making of HAPs management like establishment of environmental quality standards in Korea.
절연파괴특성 향상을 위한 나노미세구조 (Ba<sub>0.7</sub>Ca<sub>0.3</sub>)TiO<sub>3</sub> 후막 제조 및 에너지 저장 특성 평가
이주승,윤송현,임지호,박춘길,류정호,정대용,Lee, Ju-Seung,Yoon, Songhyeon,Lim, Ji-Ho,Park, Chun-Kil,Ryu, Jungho,Jeong, Dae-Yong 한국재료학회 2019 한국재료학회지 Vol.29 No.2
Lead free $(Ba_{0.7}Ca_{0.3})TiO_3$ thick films with nano-sized grains are prepared using an aerosol deposition (AD) method at room temperature. The crystallinity of the AD thick films is enhanced by a post annealing process. Contrary to the sharp phase transition of bulk ceramics that has been reported, AD films show broad phase transition behaviors due to the nano-sized grains. The polarization-electric hysteresis loop of annealed AD film shows ferroelectric behaviors. With an increase in annealing temperature, the saturation polarization increases because of an increase in crystallinity. However, the remnant polarization and cohesive field are not affected by the annealing temperature. BCT AD thick films annealed at $700^{\circ}C/2h$ have an energy density of $1.84J/cm^3$ and a charge-discharge efficiency of 69.9 %, which is much higher than those of bulk ceramic with the same composition. The higher energy storage properties are likely due to the increase in the breakdown field from a large number of grain boundaries of nano-sized grains.
연소전 CO<sub>2</sub> 포집용 분무건조 고체 흡수제의 물성 및 CO<sub>2</sub> 흡수 특성
백점인(Baek, Jeom-In),류정호(Ryu, Jungho),이중범(Lee, Joong Beom),엄태형(Eom, Tae-Hyoung),김지웅(Kim, Ji-Woong),전원식(Jeon, Eon-Sik),류청걸(Ryu, Chong Kul) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
현재 상용가능한 연소전 CO₂ 포집 기술은 습식 스크러빙 방식으로 고온의 합성가스를 상온 수준으로 온도를 낮춘 후 CO₂를 포집해야 하고 포집된 CO₂의 압력이 낮아 재압축하여 저장소로 보내야 함에 따라 큰 폭의 열효율 손실이 불가피하다. 고온 고압에서 이산화탄소를 포집할수 있는 고체 흡수제를 이용할 경우 이산화탄소 포집 치 저장 추가에 따른 시스템 효율 저하를 최소화할 수 있다. 고체 CO₂ 흡수제는 서로 연결된 두 개의 유동층 반응기를 순환하면서 흡수탑에서는 합성가스 중의 CO₂를 흡수하고 재생탑에서는 고온의 수증기와 접촉하여 흡수된 CO₂를 다시 배출함으로써 재생된다. 따라서 건식 재생 CO₂ 흡수제는 유동층 공정에 응용가능한 물성과 함께 높은 CO₂ 흡수능과 빠른 반응성이 요구된다. 본 연구에서는 유동층 공정에 적합한 물성을 가진 연소전 CO₂ 포집용 고체 흡수제를 분무건조법으로 제조하였으며, 모사 합성가스를 이용하여 열중량분석기와 기포유동층반응기를 이용하여 200?C 흡수, 400?C 재생, 압력 20 bar 조건으로 반응성을 측정하였다. 개발된 고체 CO₂ 흡수제는 열중량분석기에서는 반응 후 10-13 wt%의 무게증가를 나타내었고 기포유동층반응기에서는 8-10 wt%의 CO₂ 흡수능을 보여주었다. 특히 수증기의 함량이 10% 이상에서 높은 흡수능을 나타내어 수증기가 반응에 크게 작용하고 있음을 알 수 있었다.