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차량용량을 고려한 대중교통 통행배정모형구축에 관한 연구
이성모,유경상,전경수 대한교통학회 1996 大韓交通學會誌 Vol.14 No.3
The purpose of the thesis is providing a new formulation for the transit assignment problem. The existing models dealing with the transit assignment problem don't consider the congestion effects due to the insufficient capacity of transit vehicles. Besides, these models don't provide solutions satisfying the Wardrop's user equilibrium conditions. The congestion effects are considered to be concentrated at the transit stops. For the transit lines, the waiting times at the transit stops are dependent on the passenger flows. The new model suggests the route section cost function analogous to the link performance function of the auto assignment to reflect the congestion effects in congested transit network. With the asymmetric cost function, the variational inequality programming is used to obtain the solutions satisfying Wardrop's condition. The diagonalization algorithm is introduced to solve this model. Finally, the results are compared with those of EMME/2.
지중송전선로 접속부용 미분무 강화액 소화설비의 개발연구
이성모 한국화재소방학회 2008 한국화재소방학회논문지 Vol.22 No.1
지하전력구에서의 지중송전선로 접속부의 화재에 대한 강화액 미분무 소화설비의 개발을 위한 화재시험 을 수행하였다. 높이 5.5m, 폭 3 m, 길이 6m의 화재시험실에 154 kV OF 케이블 6단으로 소화모형을 설치하였으며 하부의 점화대의 연료는 휘발유를 사용하였다. 화재감지용 정온식 감지선형 감지기는 케이 블 최상단에 설치하였고, 소화약제 방출노즐은 천장부와 측벽부에 각각 설치하였다. 총 7회의 소화시험을 실시하고 미분무 강화액 소화설비로 개발된 제품을 소화모형에 방사하여 표면화재 및 심부화재의 판정기 준인 3분 이내에 성공적으로 소화하였다. Full-scale fire extinguishment tests were conducted to develop loaded stream fire extinguishing systems for protecting underground transmission cables. The dimension of test mock-up was 5.5 m height × 3 m width × 6 m length, and six 154 kV OF cables were piled up. Gasoline was used to ignite cables. Linear heat detection cables were installed on top of 154 kV OF cable and discharge nozzles were installed on the top and sidewalls, respectively. As a result, both surface fires and deap-seated fires were extinguished successfully within the specified 3 minutes by discharging loaded stream agent.
Design of a DMA Controller for Loss-less Image Processing
이성모,장지훈,이상묵,오정환,이승은 한국과학기술원 반도체설계교육센터 2016 IDEC Journal of Integrated Circuits and Systems Vol.2 No.2
In this paper, we present a DMA (Direct Memory Access) controller to access data from the system memory on image processing system. The image data, which are processed in real time, have to be stored or read without loss of data in the memory. However, an embedded processor has a limit to directly process large amounts of the image data from camera sensor in real time. In order to resolve this limitation, DMAs are used in various systems. In this paper, we implement the DMA controller by using an FPGA and verify the functionality of the DMA controller in the system based on Avalon Memory Mapped interface. Also, the DMA controller is fabricated by using Magnachip/Hynix 0.35 um CMOS technology and operations of the fabricated DMA is verified.