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승용CRDi용 3세대 피에조 인젝터의 내부 유압 모델링 및 수치검증
조인수(Insu Jo),정명철(Myoungchul Jeong),우세종(Saejong Woo),이진욱(Jinwook Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Performance of DI diesel engine with high fuel injection method is directly related to its emission characteristics and fuel consumption. In this study, new numerical model is designed to analyze of 3rd generation piezo-driven injector. And the injection response characteristics of CRDi injectors between conventional 3-way piezo and 3rd generation piezo-driven injector was investigated by using the AMESim simulation code. From this study, we found the bypass-circuit inside 3rd generation piezo injector can cause the injection response with the biggest difference of each injector. Also it was shown that 3rd generation piezo-driven injector had a faster response and had better control capability than 3-way piezo-driven injector due to hydraulic bypass-circuit.
3-way형과 Bypass형 서보유압 피에조 인젝터의 구동특성 비교
조인수(Insu Jo),정명철(Myoungchul Jeong),이진욱(Jinwook Lee) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.5
CRDi technology of diesel engine was developed from in the early 2000s due to a need to increase fuel efficiency and environment care. Especially, high-pressure fuel injection system in CRDi system which has a fuel injection unit including an injector, a fuel pump and common-rail, etc. becomes possible to make the exhaust gas clean as well as power improvement. In this study, comparison of dynamic characteristics of servo-hydraulic piezo-driven injector with 3-way and bypass-circuit type was analyzed by using the AMESim code. As results of this study, it found the bypass-circuit inside servo-hydraulic piezo injector can cause a faster injection response than that of the 3-way type. Also it was shown that bypass-circuit type had better control capability due to hydraulic bypass system.
승용CRDi용 3세대 피에조 인젝터 유압해석모델 개발 및 검증
조인수(Insu Jo),정명철(Myoungchul Jeong),이진욱(Jinwook Lee) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.4
Performance of DI diesel engine with high fuel injection method is directly related to its emission characteristics and fuel consumption. In this study, numerical model of 3rd generation piezo-driven injector was designed to analyze the hydraulic performance. Also the injection response characteristics was investigated by using the AMESim simulation code. From this study, it was shown that 3rd generation piezo-driven injector had a faster response and had better control capability due to its hydraulic bypass-circuit that has potential to higher hydraulic characteristics and improved accuracy of injected fuel quantity.
AMESim기반 피에조 인젝터용 해석모델의 민감도 특성 해석
조인수(Insu Jo),권지원(Jiwon Kwon),이진욱(Jinwook Lee) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.2
Performance of DI diesel engine with high fuel injection method is directly related to the emission characteristics and fuel consumption. At present, diesel injection system with piezo element is replacing conventional solenoid type due to their faster electro-mechanical properties. In this study, it was investigated the sensitivity characteristics regarding internal hydraulic modeling based on the AMESim environment of piezo-driven injector The analytic parameter for this study defined such as In/Out orifice, injection holes diameter and driven voltage on piezo stack. As the results, it was shown that these parameter influence on a fast response characteristics of piezo-driven injector. Also we found fuel pressure recovery time is faster about 0.1 ms due to larger IN orifice diameter. And larger OUT orifice diameter occurs maximum pressure drop with faster its timing of about 0.2 ms.
조인수(Insu Jo),이중협(Junghyup Lee),이진욱(Jinwook Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The performance of Diesel injector is directly related to the power and emission performance and fuel consumption in a Diesel engine. In this study, it was investigated the dynamic characteristics of Diesel injectors with different driving type for the common rail direct injection by using the AMESim simulation code. The analysis parameter defined such as fuel pressure, injection hole"s diameter and driven voltage. As the results, it was shown that the piezo-driven injector had a faster response and had better control capability than the solenoid-driven injector. It was found the piezo-driven can be utilized effectively as multiple injection than solenoid-driven injector.
Jo, Seongjae,Kim, Insu,Lee, Wonseok,Kim, Minwoo,Park, Joohyung,Lee, Gyudo,Yoon, Dae Sung,Park, Jinsung Elsevier Applied Science 2019 Biosensors & bioelectronics Vol. No.
<P><B>Abstract</B></P> <P>Fibrinogen, which is a glycoprotein that circulates in the blood, plays various important biological roles, <I>e.g.,</I> in blood coagulation, fibroblast proliferation, angiogenesis, and wound healing. Abnormal levels of fibrinogen in plasma have been identified as a key biomarker of a variety of disorders from cardiovascular diseases to hemophilia. Therefore, the development of a quantitative assay for fibrinogen in the blood has emerged as an important issue for the prevention and diagnosis of these diseases. Meanwhile, it is well known that erythrocytes can selectively capture fibrinogen because of the fibrinogen receptor expressed on their plasma membrane. Inspired by these biological interactions, herein, we devised an erythrocyte membrane (EM)-blanketed biosensor based on localized surface plasmon resonance (LSPR) for highly sensitive detection of fibrinogen. By placing the EM onto a nanoparticle-on-substrate, we enhanced the LSPR signal, achieving highly sensitive and selective detection of fibrinogen. We demonstrated that fibrinogen detection is possible over a wide concentration range, 0.001–5.000 mg/mL, which can cover normal and pathological blood fibrinogen levels. In addition, it was verified that the biosensor selectively detects fibrinogen in comparison with other human-blood-plasma components. The nanoplasmonic sensor blanketed with the EM opens up new opportunities for the development of a robust fibrinogen-sensing technology.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The highly sensitive EM-blanketed LSPR biosensor for detection of fibrinogen has been developed. </LI> <LI> The coating EMs onto the sensor can improve the LSPR signal by stable attachment of AuNPs onto the sensor. </LI> <LI> The EM-blanketed LSPR sensor showed wide linear dynamic range and very low detection limit. </LI> <LI> The proposed sensor was used for determination of fibrinogen in human blood plasma samples. </LI> </UL> </P>
조재천(Jaecheon Jo),문남수(Namsu Mun),이기주(Kiju Lee),한인수(Insu Han),김종일(Jongil Kim),김희진(Heejin Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Failure of the exhaust pipe can cause air pollution by reducing ability of exhaust gas purification and can cause noise pollution and ride degradation by reducing ability of noise isolation. Therefore, it should ensure high reliability of the product to meet the growing environmental regulations and the needs of consumers. However, under actual conditions of use, it spends a lot of time and cost in order to develop products of high reliability. Therefore, accelerated life test to estimate the relationship between stress and life is performed to predict the actual life from the observed data through tests of the product by promoting the failure of products in severe conditions than real use conditions. The purpose of this study is estimating lifetime of exhaust pipes through accelerated life test and to evaluate average life, failure rate and etc. in short term.
Lee, Sangkyu,Jo, Insu,Kang, Sangmin,Jang, Bongchul,Moon, Joonhee,Park, Jong Bo,Lee, Soochang,Rho, Sichul,Kim, Youngsoo,Hong, Byung Hee American Chemical Society 2017 ACS NANO Vol.11 No.6
<P>Recently, smart contact lenses with electronic circuits have been proposed for various sensor and display applications where the use of flexible and biologically stable electrode materials is essential. Graphene is an atomically thin carbon material with a two-dimensional hexagonal lattice that shows outstanding electrical and mechanical properties as well as excellent biocompatibility. In addition, graphene is capable of protecting eyes from electromagnectic (EM) waves that may cause eye diseases such as cataracts. Here, we report a graphene-based highly conducting contact lens platform that reduces the exposure to EM waves and dehydration. The sheet resistance of the graphene on the contact lens is as low as 593 Omega/sq (+/- 9.3%), which persists in an wet environment. The EM wave shielding function of the graphene-coated contact lens was tested on egg whites exposed to strong EM waves inside a microwave oven. The results show that the EM energy is absorbed by graphene and dissipated in the form of thermal radiation so that the damage on the egg whites can be minimized. We also demonstrated the enhanced dehydration protection effect of the graphene-coated lens by monitoring the change in water evaporation rate from the vial capped with the contact lens. Thus, we believe that the graphene-coated contact lens would provide a healthcare and bionic platform for wearable technologies in the future.</P>