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LPG 직분 연료 공급 시스템에서 연료 리턴에 의한 연료 냉각효과 연구
이정호(Jeongho Lee),이종혁(Jonghyeok Lee),이충근(Chunggeun Lee),이진학(Jinhak Lee),이대엽(Daeyup Lee) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In order to meet the emissions standards for PM and PN, a development of technology for LPG SIDI(Spark Ignition Direct Injection) fuel supply system and for its application are necessary. Prevention of a vapor lock with use of LPG fuel leads to begin this work. The purpose of this work is to provide optimum design methods for preventing the locking of the fuel vapor from the LPG fuel supply system, and contributes to construction of the designed data. An effect of fuel cooling by returning some fuel from the high pressure pump to the fuel tank is identified using a rig system with Butane/propane= 70%/30% fuel, which enables to estimate the increase of temperature to slow down up to max. 1.4 times. As returning amount of fuel increases, an effect of cooling fuel pump varies and thus an excessive use of low pressure pump leads to the durability and fuel economy problems. Therefore, this work suggests the variable control of returning amount of fuel needs to be reviewed and applied. Measured results of temperature change of high pressure pump show that, after heating to high temperature, it is confirmed that a start of return(opening of return valve) lowers(cools) the temperature of high pressure pump. This concludes that low pressure pump(in-tank motor) enables to cool down the high pressure pump and thus reduce the start time at high temperature re-startability.
노후주거지 재생을 위한 골목길 개선 방안 -광양읍 도시재생사업지역을 대상으로-
강승희(SeungHee Kang),박근모(GeunMo Park),이진학(JinHak Lee),안재락(JaeRak Ahn) 대한공간정보학회 2020 한국공간정보학회 학술대회 Vol.2020 No.6
광양읍 원도심은 도시재생사업이 진행 중인 중소도시로 광양제철소 건설과 시가지확장으로 인한 급격한 발전과 원도심의 쇠퇴가 진행되었다. 광양읍의 도시공간은 자연발생적 가로와 필지에 계획도로망이 개설됨으로서 주거지의 연속성이 분절되었으며, 블록 내부는 세가로에 연결되어 형성된 전통주거지로 한옥밀집지를 형성하며 옛 모습을 간직하고 있다. 원도심의 인구감소와 고령화, 공 · 폐가의 증가로 쇠퇴 현상이 뚜렷하며, 생활기반시설의 매설과 설치로 인한 정돈되지 않은 상태의 골목환경은 주거환경을 악화시키고 있다. 본 연구는 광양 주거의 변천사와 생활사를 간직하고 있는 광양읍 원도심 한목밀집지의 한옥과 골목의 물리적 · 공간적 환경의 특성을 분석하여 주거지 재생을 위한 기초자료를 구축하고,골목재생을 통한 노후주거지의 정주환경 개선방안을 제시하고자 한다.
유경상(Gyeong-sang Yoo),김승준(Seung-jun Kim),이진학(Jinhak Lee) 서울연구원 2013 서울연구원 정책과제연구보고서 Vol.- No.-
Motorways are limited-access roads for the exclusive use of certain classes of motor vehicles. They are free of any at-grade crossings with other roads, railways, or pedestrian paths. Seoul has a total of 13 motorways which consist of 10 urban expressways and 3 main arterial roads. Motorways have played important roles in fluent traffic movement and enhanced safety. However in many cases motorways receive significant opposition from nearby residents because they are space-intensive, attract the large traffic volumes, and cause inconvenience to pedestrians and bicyclists. This study aims to evaluate the operational efficiency of motorways and to propose some improvement strategies focusing on the release of motorway designation. The operational efficiency is evaluated based on AHP method with a total of 14 performance indices including travel speed, accident rate, networkability, and long-distance travel ratio, etc. The evaluation produces meaningfully different results for different motorway types. Most of urban expressways are functioning as planned except Jemulpo-gil, where are more vehicles than it can handle. Otherwise the 3 main arterials lose their function because they are subjected to low travel speed, high accident rate, and low long-distance travel ratio. Therefore some improvement strategies such as the release of motorway designation and the revision of laws or regulations need to be implemented to fit current operational conditions. Nambusunhwan-ro(Oryu IC~Guro IC, 3.2㎞) is recommended to be released from motorway designation to reduce citizens’ inconvenience. The evaluation result shows the lowest value in terms of efficiency mainly because operational issues and problems that are prohibited or restricted by laws or regulation are easily observed for this section such as pedestrian crosswalk and sidewalk, bus stop, and motorcycle access. Yangjae-daero marks a lower efficiency score than most of motorways as well as it also has several prohibited facilities. From a roadway network perspective, however, it plays an important role in connecting major trunk roads. In more details Yangjae-daero will connect Gangnamsunhwan expressway, whose construction will be completed at 2018, with Dongbugansun expressway. As a result it is better way to keep Yangjae-daero designated as a motorway. Nodle-gil has not only a low efficiency but also it causes severe inconvenience and confusion to motorcyclists crossing Seongsan-daegyo from north to south. They violates laws in their own despite because all of the roads connected to Seongsan-daegyo at south, Nodle-gil and Seobugansun expressway, are motorways where motorcycles are prohibited from traveling. Therefore it is recommended to move the western starting point of a motorway from the north end of Yanghwa-gyo to the south end of Yanghwa-daegyo. From a different standpoint, it is necessary to ask central government to revise the laws or regulations for the separate facility standards applicable to urban expressways and main arterials respectively. In addition, the improvement of visibility and readability of road signs and the introduction of road marks need to be considered to reduce the traffic accidents. Finally it also needs to be studied carefully, from a long-term point of view, whether to grant a permission for motorcyclists to use motorways to get a better equity between modes. This study is expected to provide a logical basis for deciding whether to release motorway designation of the roads having a low operational efficiency, and to suggest a direction for improvement in the operation of the existing motorways.
실작업 굴삭기에 장착한 연비계를 이용한 공회전 정지에 따른 연료 소비량 저감 효과 연구
강명철(Myeongcheol Kang),정진범(Jinbeom Jeong),이종혁(Jonghyeok Lee),이진학(Jinhak Lee),이대엽(Daeyup Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Since the fuel economy of an excavator will be regulated in near future, it is required to study measures to reduce fuel consumption. Currently, idle stop technology is widely used in vehicles worldwide, however, its effect in an excavator in real work sites has hardly been studied. In this work, In order to study the effect of idle stop in an excavator at real work sites, fuel consumptions of both engine idling and starting are experimentally measured. Using the on board fuel meter built in this work, the fuel consumption of an excavator in real work sites is investigated. This work concludes that, throughout six real work sites, an enhancement of fuel economy up to 5.5% is estimated using the fuel consumptions of engine idle and starting measured in this work.