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승용차 디젤엔진의 연료 다단 분사가 연소 안정 및 배출물 특성에 미치는 영향
노현구,이창식,Roh, Hyun-Gu,Lee, Chang-Sik 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.4
This paper described the effect of the multiple injections on the stability of combustion and emission characteristics in a direct injection diesel engine at various operating conditions. In order to investigate the influence of multiple injections in a diesel engine, the fuel injection timing was varied one main injection and two pilot injections at various conditions. The experimental apparatus consisted of DI diesel engine with four cylinders, EC dynamometer, multi-stage injection control system, and exhaust emissions analyzer. The combustion and emission characteristics were analyzed for the main, pilot-main injection, pilot-pilot-main injection strategies. It is revealed that the combustion pressure was smoothly near the top dead center and the coefficient of variations is reduced due to the effect of pilot injection. Also, $NO_x$ emissions are dramatically decreased with pilot injection because the decrease of rate of heat release. However, the soot is increased at early pilot injection and main injection.
디젤-에탄올 혼합연료의 다단 분사가 디젤 엔진 성능 및 배기물 특성에 미치는 영향
노현구(Hyun Gu Roh),이두진(Doo Jin Lee),성기안(Kian Sung),이창식(Chang Sik Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This study is to investigate the effect of the multiple injections on the emission characteristics and engine performance of ethanol blended diesel fuel in a 4 cylinder light-duty diesel engine. In order to perform the influence of multiple injections and diesel-ethanol blended fuel in a passenger diesel engine, the injection strategy was controlled with pilot injection, double pilot injections, and one main injection at various experimental conditions. The experimental apparatus is consisted of DI diesel engine, EC dynamometer, multi-stage injection control system, and exhaust emissions analyzer. The results showed that diesel-ethanol blended fuel had longer ignition delay than those of diesel fuel. Also the effects of diesel-ethanol blended fuel on the exhaust emissions such as NOX and soot emissions were discussed under the various test conditions.
운행차 배출가스 정밀검사 결과를 이용한 가솔린 차량에 대한 배출가스 특성 분석
노현구 ( Hyun Gu Roh ) 한국액체미립화학회 2018 한국액체미립화학회지 Vol.23 No.3
In this study, the following conclusions could be obtained from the analysis of emissions contribution rates and features for contaminated emissions by 13,456 gasoline vehicles passed in the vehicle load test (ASM-idle) under the inspection year 2013 to 2017. It was confirmed that the contamination of the CO, HC, NOx by the displacement is reduced on over 3L engine. As a result of comparing the exhaust gas in the low speed idle mode and the AS2525 mode, the exhaust gas in the low speed idle mode was measured high. It is estimated that if ISG function is applied, emissions from idle condition will be reduced. NOx emissions were reduced when the engine power was above 200HP. It has been confirmed that the amount of exhaust emissions are significantly reduced for vehicles manufactured after 2004. As a result of analyzing the exhaust gas according to the season, it is judged that there is a correlation between HC and NOx according to the ambient temperature. The concentration of exhaust emission in vehicles with high accumulated distance increases, which is considered to be the result of aging of the vehicle.
승용 디젤 CRDI 엔진의 다단 분사가 연소 및 배기 특성에 미치는 영향
노현구(Hyun Gu Roh),이창식(Chang Sik Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper described the effect of the multiple injection on the stability of idle-operating and emission characteristics in a common rail direct injection diesel engine at various operating conditions. In order to investigate the influence of multiple injections in a diesel engine, the fuel injection timing was varied two pilot injections and one main injection at various conditions. The experimental apparatus is consisted of DI diesel engine with 4 cylinders, EC dynamometer, multi-stage injection control system, and exhaust emissions analyzer. The combustion pressure was measured using a piezoelectric pressure sensor installed the hole of glow plug. Detection of the crank angle of rotating engine was used for the crankshaft position sensor of the magnetic inductive type installed. The exhaust emissions from the engine were measured by using transmitted light type soot measuring instrument and NOx, HC and CO analyzer. The operating point was analyzed for the main, pilot-main, pilot-pilot-main strategy were tested. It is revealed that the combustion pressure was smoothly near the TDC and the coefficient of variations is reduced due to the effect of pilot injection. Also, NOx emissions are dramatically decreased with pilot injection because the rate of heat release. However Soot is increased at early pilot injection at main injection.
노현구(Roh, Hyun Gu),吳次芳(Wu, Ci Fang),方明(Fang, Ming),정재호(Chung, Jae Ho) 한국부동산학회 2011 不動産學報 Vol.47 No.-
1. CONTENTS (1) RESEARCH OBJECTIVES This paper aims to examine the privatization of Chinese public housing during commercial housing process after reform and open since 1978. Also, this study is to explore and analysis uneven wealth distribution caused by the privatization of Chinese public housing. (2) RESEARCH METHOD This study was performed through Chinese literature investigation and consultation with relevant experts. (3) RESEARCH RESULTS China started to sell public housing to their employees by very cheap price through private housing reform after 1982. As of 2007, Shanghai has been sold 1.73 million public housings to employees, ninety-six percent of public housings were privatized. However, relative to commercial housing, the price of public housing was 2.78 times cheaper than it in 2000. By 2009, it was 10 times cheaper than commercial housing. 2. RESULTS Throughout the welfare housing to the currency housing, the employees with workplace have continued to benefit from housing reform, which exacerbated rich-poor polarization.
승용 디젤 엔진에서 분사 전략이 배출 가스 및 엔진 성능에 미치는 영향에 관한 연구
노현구(Hyun Gu Roh),이두진(Doo Jin Lee),이창식(Chang Sik Lee) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.3
This paper described the effect of the multiple injections on the emission characteristics and combustion stability in a common rail diesel engine. In order to investigate the influence of multiple injections in a passenger car diesel engine, the injection strategy was varied with pilot injection, post injection and one main injection at various conditions. Based on the experimental results, the combustion and emissions characteristics were analyzed for the various injection strategies such as main, pilot-main, double-pilot-main, double-pilot-main-post injection strategy. It is revealed that the NOX, HC and CO emissions are reduced by double pilot and post injection at medium load, however, soot emission is increased. Also, in the case of multiple injection, the combustion pressure is increased smoothly near the TDC and the coefficient of variation and fuel consumptions are decreased.
TMA(Traffic Measurement Agent)를 이용한 인터넷 응용 트래픽 분류
윤성호 ( Sung-ho Yoon ),노현구 ( Hyun-gu Roh ),김명섭 ( Myung-sup Kim ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.1
네트워크를 사용하는 응용프로그램의 종류가 다양해지면서 네트워크 트래픽의 응용별 분류는 효율적인 네트워크 관리에 있어 그 중요성이 커지고 있지만, 오늘날 응용프로그램의 특징인 유동적인 포트번호 사용 및 패킷의 암호화 등은 트래픽의 응용별 분류를 더욱 어렵게 하고 있다. Well-known 포트기반의 응용별 분류방법의 단점을 극복하기 위하여 머신러닝 알고리즘과 Signature 기반 분석 방법들이 연구되고는 있지만 주장하는 높은 분석률에 비하여 실제 네트워크 트래픽에 적용하기에는 신뢰성이 부족하다. 본 논문에서는 일부 종단 호스트에 설치된 TMA(Traffic Measurement Agent)로 부터 수집한 응용프로그램의 트래픽 사용 정보를 기초로 하여 전체 네트워크 트래픽의 응용프로그램을 판별하는 응용 트래픽 분류 방법론을 제안한다. 제안된 방법론은 트래픽 플로우들의 상관관계를 이용하여 TMA 호스트 트래픽으로부터 TMA가 설치되지 않은 호스트에서 발생한 트래픽들의 응용을 판단하며, 분류된 결과에 대하여 높은 신뢰성을 보장한다. 제안된 방법론은 학내 네트워크에 적용하여 그 타당성을 검증하였다.