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디젤 엔진의 0D Soot 모델 개발 Part. 2: Soot 모델링
이영복(Youngbok Lee),이용주(Yongjoo Lee),문선영(Sunyoung Moon),민경덕(Kyoungdoug Min),이승하(Seungha Lee),노영준(Youngjun Roh) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
환경 오염 문제에 대한 관심으로 각국은 차량에서 배출되는 유해물질들에 대한 규제를 더욱 강화하고 있다. NOx와 함께 디젤 엔진의 주요 배기 배출 물질 중 하나인 soot은 연료 스프레이에서의 비균질한 혼합기 형성으로 인해 생성된다. 현재 대부분의 디젤 차량들은 엔진에서 배출되는 soot을 여과하기 위해 DPF (Diesel Particulate Filter)를 장착하고 있다. 하지만 배기 온도를 상승시켜 DPF를 재생하는 과정에서 열에너지의 배기손실로 인한 연비 악화가 따르며, 이를 막기 위해 엔진 배출 soot을 저감 시켜 DPF 재생 횟수를 최소화할 필요가 있다. 따라서, 본 연구에서는 engine-out soot을 실시간으로 예측하기 위한 0-D soot 모델을 개발하였다. 본 연구에서 개발한 semi-empirical soot 모델은 디젤엔진의 연소 과정 중 soot의 생성과 산화를 모두 고려하며, 특히 soot의 생성과 큰 연관이 있다고 알려진 lift-off length에서의 당량비를 스프레이 모델을 통해 계산하여 soot 생성모델의 주요 인자로 활용하였다. 이 외에 soot 생성의 근원이 되는 연료의 분사량과 soot 생성 기간을 대표하는 연소구간을 soot 생성 모델에 활용하였다. Soot 산화 모델에는 Nagle 과 Strickland-Constable이 제시한 산화율을 주요 인자로 활용하였다. 개발된 soot 모델은 냉각수온도/흡기온도 등의 환경 조건 변화가 포함된 정상상태 실험에서 결정계수 0.9 이상의 예측 결과를 보여주었으며 WLTC (Worldwide harmonized Light-duty vehicles Test Cycles) 과도상태 실험에서 soot 배출 누적량을 10% 이내로 예측하였다. 본 연구에서 개발한 soot 모델을 활용하여 엔진 배출 soot 최소화를 위한 실시간 제어 전략에 활용할 수 있으며 강화되고 있는 RDE (Real Driving Emission) 규제에 대응하기 위한 엔진 개발 및 실도로 시험에 소요되는 시간과 노력을 절약할 수 있다.
이현우(Hyunwoo Lee),최영태(Youngtae Choi),이광범(Kwangbum Lee),이정기(Jeongki Lee),김광일(Kwangil Kim),이정화(Jeongwha Lee),임종순(Jongsoon Lim),신영복(Youngbok Sin) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
All across our nation, people live, work, and learn in indoor environments and especially, many people spend more time than ever before inside of cars. Recent years have been increasing attention focused on the air contamination inside auto-cabin. The sources of air contamination inside auto-cabin are roughly divided into internal sources(ex. chemical compounds from interior material) and external sources(ex. tail-pipe emission etc.). The Purpose of this research is to examine the status of worldwide auto-cabin air quality study, and to give the information when research is intended to develop methods to mitigate indoor air problem from auto-cabin.
Youngbok Lee,Jae-Sung Kwon 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
Microfluidic free-flow electrophoresis (lFFE) is the most promising technique for proteomics. This methodcan perform real-time separation and detection of analytes in a small device where a continuousflowof carrierbuffer is driven and an external electric field is applied perpendicular to the buffer flow. The capabilityof lFFE has motivated extensive applications pertaining to the pre-fractionation, enrichment, and higherlevelpurification of target proteins in biological systems. This review introduces the proteomics applicationsof the technique, along with a detailed theoretical overview, as follows. First, the principle and theband broadening involved in lFFE are explained. Next, materials for the fabrication of a lFFE device aredescribed, followed by a summary of the online detection methods for lFFE. Finally, various applicationsof lFFE in proteomics fields are introduced, particularly focusing on microfluidic free-flow zone electrophoresisand microfluidic free-flow isoelectric focusing, the two major separation modes of lFFE.
Lee, YoungBok,Lee, JiHyun,Choi, JinYoung,Yu, DongSoo,Han, KyungDo,Park, Yong-Gyu Elsevier 2019 Diabetes & metabolism Vol.45 No.1
<P><B>Abstract</B></P> <P><B>Aim</B></P> <P>As the associations between actinic keratosis (AK) and diabetes complications in patients with diabetes mellitus (DM) have never been investigated, this study aimed to evaluate any such associations in patients with DM.</P> <P><B>Methods</B></P> <P>This retrospective cohort study analyzed clinical data for DM patients aged>40 years who had undergone the health examination recommended by the South Korea National Health Insurance Program between 2009 and 2012 (<I>n</I> =2,056,580). All of these patients were classified according to the presence of diabetic retinopathy (DR), end-stage renal disease (ESRD) and history of DVD; myocardial infarction, stroke, transient ischaemic attacks. Newly diagnosed AK was identified using claims data from baseline to the date of diagnosis or 31 December 2015, whichever came first.</P> <P><B>Results</B></P> <P>Of the 2,056,580 patients with DM, 6404 (0.31%) developed AK. Those patients in the DR, ESRD and CVD groups were more likely to be diagnosed with AK (<I>P</I> <0.001, by log-rank test). After adjusting for age and gender, the risks for AK were significantly higher in the DR, ESRD and CVD groups: HR (95% CI): 1.29 (1.21–1.39), HR: 4.24 (3.28–5.47) and HR: 1.22 (1.13–1.31), respectively.</P> <P><B>Conclusion</B></P> <P>This study has revealed that the incidence of AK is higher in diabetes patients with ocular, renal and cardiovascular complications.</P>
Lee, Youngbok,Chung, Hoeil,Kim, Nakjoong Society for Applied Spectroscopy 2006 Applied spectroscopy Vol.60 No.8
<P>The proper selection of the spectral range in partial least squares (PLS) calibration is critical when highly overlapping spectra from compositionally complex samples are used, such as naphtha and gasoline. In particular, the relevant spectral information related to a given property is frequently localized in a narrow range, and the most selective region may be difficult to locate. We have presented the importance of range optimization in near-infrared (NIR) spectroscopy for the analyses of petrochemical and petroleum products that are generally highly complex in composition. For this purpose, the determination of a detailed compositional analysis (so called PIONA) and the distillation temperature of naphtha were evaluated. In the same fashion, the research octane number (RON) and Reid vapor pressure (RVP) were selected for gasoline. By optimizing the range using moving window (MW) PLS, the overall calibration performance was improved by finding the optimal spectral range for each property. In particular, for a detailed compositional analysis of naphtha, it was effective to search for localized spectral information in a relatively narrow range with fewer factors.</P>
조영복(youngbok Cho),최재민(jaemin Choi),이영진(youngjin Lee),손녕(Ning Sun),이상호(sangho Lee) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.2D
콘텐츠의 다양화로 인해 콘텐츠의 관리를 위해 CMS(contents Management System)가 다양하게 운영되고 있다. 현재 CMS들은 단지 소속회원들을 기반으로 DRM기술을 적용하여 콘텐츠 저작권을 보호하고 있다. 따라서 콘텐츠의 글로벌 사용이 제한되고 상호운용이 불가능하고 콘텐츠의 원천적 저작권보호가 불가능하다. 따라서 이 논문에서는 저작권 보호를 위하여 공개키 기반의 라이선스관리 모듈을 설계하였으며 이를 기반으로 콘텐트 암호화하는 패키저 모듈, 암호화된 콘텐트를 복호화하는 언 패키저 모듈, 콘텐트 공유서버 및 클라이언트 모듈을 설계하였다. 이기종간의 CMS는 트랜젝션 서버를 통해 통합 메타데이터를 공유하며 통합 CMS를 운영하여 다양한 콘텐츠를 다양한 CMS에서도 활용 가능하도록 제안하였으며 웹 콘텐츠 인증코드를 이용한 DRM 기술을 기반으로 콘텐츠 사용 제한 및 저작권 보호를 지원한다.
엔진오일 주입을 통한 SOF가 EGR Cooler Fouling에 미치는 영향에 대한 평가
이영복(Youngbok Lee),송순호(Soonho Song),전광민(Kwang Min Chun),민선기(Sunki Min),정도영(Doyoung Chung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The cooled HPL EGR system(EGR) is an effective strategy to control NOx emission. However, the high concentration of particulate matter(PM) in diesel exhaust gas causes significant soot deposition on the wall of the EGR cooler and reduces the heat transfer performance of the EGR cooler and the reduction rate of NOx. The deposition of PM tends to be occurred more severly with “heavy wet”, which is more frequently at the LTC(Low Temperature Combustion) engine. The goal of this research is to evaluate the effects of SOF(Soluble Organic Fraction) on deposit characteristics of the EGR cooler. To achieve this goal, surrogate SOFs, the engine oil, was used in this experiment. The result of this work is that the reduction rate of the heat exchanger’s effectiveness more increased with engine oil injection than without engine oil injection. However, the reduction rate of the heat exchanger’s was not increased linearly according to increasing the injection rate of the engine oil. There is an another result of this work that the deposit mass of EGR cooler was increased with engine oil injection, which was increased as the engine oil injection rate was increased.