http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김영진(Kim Yungjin),허열(Heo Yol),오병현(Oh Byunghyun) 한국지반환경공학회 2007 한국지반환경공학회논문집 Vol.8 No.6
국내 노후화된 필댐의 경우에는 수문학적 안정성과 더불어 구조적 안정성 확보가 국가재난 예방차원에서 요구되고 있는 실정이다. 설계 및 시공시의 문제나 지진 등 자연현상으로 인하여 댐체가 손상되었거나 노후화로 문제된 댐의 대부분이 필댐 타입이며, 이중 일부는 차수(코아) 존이 손상되어 과다한 누수현상이 발생되고 있어 홍수시 댐 붕괴로까지의 진행이 우려되는 바 차수보강대책에 대한 체계적인 연구가 시급하다고 여겨진다. 본 연구에서는 침투그라우팅으로 보강된 필댐에 있어서 보수보강 전후의 차수 성능변화를 전기비저항탐사 등의 물리조사를 이용하여 분석ㆍ평가하고자 하였다. 연구결과 전기비저항탐사는 그라우팅으로 보강된 필댐의 보강효과를 판단하는 유효한 도구로 사용될 수 있음을 알 수 있었으며, 그라우팅으로 보강된 필댐의 누수량은 크게 저하되어 안정성이 향상 되었음을 알 수 있었다. Maintenance of structural and hydrological safety of the superannuated fill dam is very important subject on the viewpoint of disaster prevention. Mainly, the core of the superannuated fill dams have been damaged continuously by the various harmful external forces such as the typhoons, flash floods and earthquake, and these can be connected to the large scaled general dam failure. Therefore, the research on the repair, remediation and reinforcement of dam is necessary. In this study, the permeable grouting method for the remediation of fill dam was examined by the electrical resistivity survey and the change of permeability of core front. As a result, the permeable grouting method can be useful remediation method for the superannuated fill dam, the leakage from the core front decreased greatly before and after the construction of grouting. Furthermore, it can be said that the turbidity of fill dam may not be greatly increased by grouting.
디젤 엔진의 다단 조기 분사가 엔진 연소 및 배기 특성에 미치는 영향
김재웅(Jaewoong Kim),김영진(Yungjin Kim),박상기(Sangki Park),이기형(Kihyung Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Diesel engine technologies have been improved owing to high pressure common rail injection system. Since emission regulation for diesel engine has been enhanced, researchers tried to find a way to decrease NOx and PM such as clean combustion and after treatment. Among these clean combustion, premixed charge compression ignition technology is spotlighted as one of candidates for reducing NOx and PM simultaneously. In order to establish the premixed charge compression ignition, fuel is injected during early compression stroke and it can make enough time for uniform air-fuel mixture formation. Therefore, it is necessary to inject the fuel early timing to make homogeneous mixture in a cylinder. In this paper, early injections were used to get better combustion stability and characteristics of combustion and emissions were investigated with early injection strategies such as various early injection numbers(?) and timings. As a result, smoke was increased a little but it was still low. In addition, THC and fuel consumption were also showed similar levels. However, NOx emission was reduced conspicuously with the use of early injection.
바이오 디젤과 디젤 연료의 혼합비율에 따른 연소 및 배기 특성 연구
한준섭(Joonsup Han),김영진(Yungjin Kim),김형익(Hyungik Kim),이기형(Kihyung Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
As the problems of environmental pollution and energy depletion become more severe, strict emissions regulations have been adopted in many countries. The use of bio-diesel fuel is a common solution to these problems because they have many advantages. In this paper, we investigated the effect of the mixing rate of bio-diesel and diesel fuel on the fuel quantity, combustion characteristics and emission characteristics in four cylinder CRDI diesel engine. As result of fuel quantity measurement, Bio-diesel injection quantity is a little bit different compared to diesel fuel. Most of BSFC value is same at the condition of NEDC 12mode. But, NOx emission is increased. Mixing rate of bio-diesel and diesel fuel that is lower CO₂ and PM emissions than diesel fuel.