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네트워크 도로터널에서 근접행렬을 이용한 교통량 계산 방법
김학범,백종훈,Kim, Hag Beom,Beak, Jong Hoon 한국터널지하공간학회 2018 한국터널지하공간학회논문집 Vol.20 No.3
도로 터널 내의 환기설계를 위해서는 먼저 각 차종별 교통량 구성 비율을 알아야 한다. 일반적인 도로터널의 경우 입구와 출구의 수가 동일하고 일방향이기 때문에 유입된 차종별 구성 비율이 출구에서 나올 때까지 달라지지 않는다. 반면에 네트워크 도로터널의 경우 터널 내의 연결이 복잡한 네트워크로 되어 있기 때문에 차종별 구성 비율이 달라진다. 이에 본 연구에서는 근접행렬을 이용하여 네트워크 도로터널에서 차종별 일교통량 구성 비율을 쉽게 계산할 수 있는 방법을 제시하였다. In order to design the ventilation in the road tunnel, it is necessary to know the ratio of average annual daily traffic by vehicle type. In general, the road tunnels are onedirectional tunnel, so the traffic of each vehicle type does not change along the tunnel. On the other hand, in the case of network road tunnels, since the connections in the tunnels are complex, the traffic of vehicle-type varies depending on the network composition of tunnels. In the studying the easy method for calculating the ratio of vehicle type for the network road tunnel are proposed with using incidence matrix.
슈퍼컴퓨터(클러스터 컴퓨터)의 철도산업에서의 활용 : 병렬처리기법을 이용한 화재유동해석
김학범(Kim Hag-Beom),장용준(Jang Yong-Jun),이창현(Lee Chang-Hyun),정우성(Jung Woo-Sung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
최근의 컴퓨터의 발달에 힘입어, 다양한 형태의 고성능의 컴퓨터가 출현하고 있다. 그 중 PC급의 CPU를 병렬 클러스터로 구성하여 고성능을 실현하고 있다. 이러한 슈퍼컴퓨터(클러스터 컴퓨터)는 저비용으로 고성능을 낼 수 있어 다양한 산업에서 적용되고 있다. 특히 전산모사분야에서는 슈퍼컴퓨터(클러스터 컴퓨터)를 이용하여 빠른 계산결과를 획득할 수 있어, 다양한 공학적 검토를 효율적으로 하고 있다. 본 논문에서는 슈퍼컴퓨터(클러스터 컴퓨터)를 활용하여 철도산업에의 적용된 사례로 병렬처리기법을 이용한 화재해석을 상세히 소개하고, 슈퍼컴퓨터(클러스터 컴퓨터)가 철도산업에의 공학적 검토에 매우 유용한 장비임을 보였다. Thanks to the recent development of computing technology, the various forms of high-performance computers are available. Among them, the parallel-clustering CPU machines are realized for the high performance computing. These supercomputers (cluster computers) can be applied to various industries due to the advantages of lower price. Especially in the field of numerical flow simulation, use of supercomputers can produce results quickly, and various engineering problems can be reviewed effectively case by case. In this paper, an application of supercomputers (cluster computers) were examined for railroad industry of fire flow simulation by using parallel computational method. It make sure that the supercomputers are very useful tools for railroad engineering.
김학범(Kim Hag Beom),장용준(Jang Yong Jun),이덕희(Lee Duck Hee),손윤석(Son Yun Suk),정우성(Jung Woo Sung) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
철도 승강장의 매점은 현재 신문판매대, 표준 간이매점, 간이매점(복권방)등의 형태로 운영되고 있다. 따라서 신문이나 잡지등은 쉽게 불에 붙기 때문에 화재의 발화원이 되며, 대구 지하철 화재사고와 마찬가지로 방화의 대상이 될 수 있다. 따라서 지하철 승강장 매점화재 방지를 위하여 매점화재 시뮬레이션 기법 정립이 필요하고 이를 통한 화재방재예측능력이 필요하다. 이에 본 연구에서는 매점화재 시뮬레이션을 수행하였고 수행된 해석결과는 매점지하철 승강장 매점화재 실험결과와 비교 고찰을 통하여 해석의 신뢰도를 검토하였다. Recently, a lot of newsstands and mini station-store are operated as a store at the platform of subway. But the papers and magazines which are main articles for sale could be as the source of fire ignitable because those kind of easy flammable. Therefore the newsstands could be the target for fire. In this paper, numerical fire simulations for the News-stand were conducted to develop the news-stand fire simulation methodology for fire safety
김학범(Kim Hag-Beom),허재경(Heo Jae-Kyung),이기열(Lee Ki-Yeol) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
Heat and fluid flow in the motor block room of a motorized car is numerically simulated. The motorized car, composed of a motor block room and a passenger room, supplies additional power "to achieve the design speed. A motor block, a transformer, and a fan are equipped in the motor block room. Flow phenomena in the ducts on the motor block and power transformer are investigated. Also, the three dimensional heat and fluid flow in the motor block room is simulated to give a qualitative information of the flow characteristics.
장용준(Jang Yong-Jun),김학범(Kim Hag-Beom),이창현(Lee Chang-Hyun),정우성(Jung Woo-Sung) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
When the fire occur in the deeply underground subway station, the difficulties of passenger evacuation are expected because of many stairs to the exit. In this study, SOONGSIL-University station (7 line, 47m depth) is the one of the deepest subway stations of the each line in the Seoul metro. The numerical computational-simulation was performed for the fire driven flow in the subway station. Hot and smoke flow was analyzed from the simulation results. The proper plan of evacuation against fire was considered through the results. The fire driven flow was simulated using FDS code in which LES method was applied. The Heat Release Rate was 10MW and the ultrafast model was applied for the growing model of the fire source. The proper mesh size was determined from the characteristic length of fire size. The parallel computational method was employed to compute the flow and heat eqn"s in the meshes, which are about 10,000,000, with 6cpu of the linux clustering machine.
터널화재유동의 역기류 해석을 위한 LES 및 RANS 결과의 비교 고찰
장용준(Yong-Jun Jang),김학범(Hag-Beom Kim),김진호(Jin-Ho Kim),한석윤(Seok-Youn Han) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.3
In this study, comparative analysis on the back-layer phenomena in the tunnel-fire driven flow is performed using numerical simulation with LES and RANS. FDS(Fire Dynamics Simulator) code is employed to calculate the fire-driven turbulent flow for LES and Smartfire code is used for RANS. Hwang and Wargo's data of scaling tunnel fire experiment are employed to compare with the present numerical simulation. The modeled tunnel is 5.4m(L) × 0.4m(W) × 0.3m(H). Heat Release Rate (HRR) of fire is 3.3㎾ and ventilation-velocity is 0.33m/s in the main stream. The various grid-distributions are systematically tested with FDS code to analyze the effects of grid size. The LES method with FDS provides an improved back-layer flow behavior in comparison with the RANS (k-ε) method by Smartfire. The FDS solvers, however, overpredict the velocity in the center region of flow which is caused by the defects in the tunnel-entrance turbulence strength and in the near-wall turbulent flow in FDS code.
스크린도어가 설치된 지하철 승강장의 화재유동 전산 수치 모사를 이용한 스크린도어의 화재 영향 연구
장용준(Jang Yong-Jun),김학범(Kim Hag-Beom),정우성(Jung Woo-Sung),박원희(Park Won-Hee) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The present study is a basic investigation for systematically proceeding disaster prevention studying the effect of platform screen door in case of fire at the subway station. In the paper, the characteristics of screen door were surveyed and described. The fully closed platform screen door and the island type of subway station were employed for simulation-study. Numerical simulations of fire driven flow at the subway station with platform screen door were performed with commercial fire CFD code. For analyzing of the effect of platform screen door, the fire simulations with and without the platform screen door were compared. For the fire location, the one is located on the platform and the other case on the railway. The Ultrafast model was taken as fire growth scenario. The maximum heat release rate was 10MW. The propagated time of the heat and smoke to stairs was within 4 minute when the fire is located on the platform. However the heat and smoke propagation was block off by screen door when the fire is located on the railway.