• Title/Summary/Keyword: Fault Train

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Analysis of Slope Stability at the End of OO tunnel being Distributed by Mica Schist (운모편암 분포지인 OO 터널 종점부에서 절토사면의 안전성 분석 연구)

  • Lee, Byung-Joo;SunWoo, Choon
    • The Journal of Engineering Geology
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    • v.19 no.3
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    • pp.287-294
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    • 2009
  • To be design the slope, the area distributed the mica schist which was metamorphosed by shale or mudstone must carefully consider the stability. Mica schist is another unstable rock for slope by schistosity, cleavage, axial plane of a fold etc. In general mica schist contains the swelling clay minerals such as smectite, vermiculite and montmorillonite. These minerals make the slope unstable. At OO tunnel construction area for the rail way of the Kyungbu high speed train, the slope of mica schist is very unstable by the distribution phenomena of the discontinuous plane such as joints which are 1-5 cm spacing and thrust and strike-slip fault. By the drilling core of this area, most RQD have 0-20%.

Module Design and Performance Evaluation of Surge Arrester for Loading In Railway Rolling Stock (전철 탑재형 피뢰기의 모듈설계 및 성능평가기술)

  • Cho, H.G.;Kim, S.S.;Han, S.W.;Lee, U.Y.
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.2038-2040
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    • 2000
  • The main objective of this paper is to design and test a new type of polymer ZnO surge arrester for AC power system of railroad vehicles. Metal oxide surge arrester for most electric power system applications, electric train and subway are now being used extensively to protect overvoltage due to lightning. Surge arresters with porcelain housing must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. When breakdown of ZnO elements in a surge arrester occurs due to flashover, fault short current flows through the arrestor and internal pressure of the arrester rises. The pressure rise can usually be limited by fitting a pressure relief diaphragm and transferring the arc from the inside to the outside of the housing. However, there is possibility of porcelain fragmentation caused by the thermal shock, pressure rise. etc. Non-fragmenting of the housing is the most desired way to prevent damage to other equipment. The pressure change which is occurred by flashover become discharge energy. This discharge energy raises to damage arrester housing and arrester housing is dispersed as small fragment. Therefore, the pressure relief design is requested to obstruct housing dispersion. The main research works are focused on the structure design by finite element method, pressure relief of module, and studies of performance of surge arrester for electric railway vehicle.

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Design and Performance Evaluation of Surge Arrester for Loading in Railway Rolling Stock (전철 탑재용 피뢰기의 설계 및 성능평가)

  • Cho, H.G.;Han, S.W.;Lee, U.Y.;Kim, S.S.;Chang, T.B.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.05a
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    • pp.74-77
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    • 2000
  • The main objective of this paper is to design and test a new type of polymer ZnO surge arrester for AC power system of railroad vehicles. Metal oxide surge arrester for most electric power system applications, electric train and must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. When breakdown of ZnO elements in a surge arrester occurs due to flashover, fault short current flows through the arrester and internal pressure of the arrester rises. The pressure rise can usually be limited by fitting a pressure relief diaphragm and transferring the arc from the inside to the outside of the housing. However, there is possibility of porcelain fragmentation caused by the thermal shock. pressure rise, etc. Non-fragmenting of the housing is the most desired way to prevent damage to other equipment. The pressure change which is occurred by flashover become discharge energy. This discharge energy raises to damage arrester housing and arrester housing is dispersed as small fragment. Therefore, the pressure relief design is requested to obstruct housing dispersion. The main research works are focused on the structure design by finite element method, pressure relief of module, and studies of performance of surge arrester for electric railway vehicle.

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Compensation of Voltage Drop Using the TSC-SVC in Electric Railway Power Supply System (전기철도 AT 급전시스템에서의 TSC-SVC를 이용한 전압강하 보상)

  • 정현수;방성원;김진오
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.16 no.3
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    • pp.29-36
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    • 2002
  • Recently, power quality problems in AC high-Speed Railway system have been raised, because heavy train and its higher speed are required in addition to new control system by using the Electronic devices. The installation/operation of the Series Capacitor(SC) has been only a device far voltage drop in power system up to now. However, the sufficient effectiveness of compensating In voltage drop has not been proved yet because of technical limitationf SC, and harmonic resonance is attracting a attention as one of new issues. Several problems are expected such as vocational problems of a traction substation, and overloading caused by a new construction of electric railway and the in transport. Therefore, extension of power feeding the fault in the traction substation should be also considered. So this paper represents the application of TSC-SVC on the electric railway power feeding system as a device of voltage compensation, and the simulations are executed through PSCAD/EMTDC.

Recognition method using stereo images-based 3D information for improvement of face recognition (얼굴인식의 향상을 위한 스테레오 영상기반의 3차원 정보를 이용한 인식)

  • Park Chang-Han;Paik Joon-Ki
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.43 no.3 s.309
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    • pp.30-38
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    • 2006
  • In this paper, we improved to drops recognition rate according to distance using distance and depth information with 3D from stereo face images. A monocular face image has problem to drops recognition rate by uncertainty information such as distance of an object, size, moving, rotation, and depth. Also, if image information was not acquired such as rotation, illumination, and pose change for recognition, it has a very many fault. So, we wish to solve such problem. Proposed method consists of an eyes detection algorithm, analysis a pose of face, md principal component analysis (PCA). We also convert the YCbCr space from the RGB for detect with fast face in a limited region. We create multi-layered relative intensity map in face candidate region and decide whether it is face from facial geometry. It can acquire the depth information of distance, eyes, and mouth in stereo face images. Proposed method detects face according to scale, moving, and rotation by using distance and depth. We train by using PCA the detected left face and estimated direction difference. Simulation results with face recognition rate of 95.83% (100cm) in the front and 98.3% with the pose change were obtained successfully. Therefore, proposed method can be used to obtain high recognition rate with an appropriate scaling and pose change according to the distance.

Design of Programming Failure Feedback System Based on Control Flow of Test Case to Support Programming Training (프로그래밍 훈련 지원을 위한 테스트케이스의 제어흐름에 기반한 프로그래밍 실패 피드백 시스템 설계)

  • Lee, Sunghee;Kim, Deok Yeop;Seo, Kang Bok;Lee, Woo Jin
    • KIPS Transactions on Software and Data Engineering
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    • v.8 no.8
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    • pp.317-322
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    • 2019
  • Programming judge systems for programming training support are typically built on the Web, where the examiners uploads a programming problem, which the student reads and submits an answer to the problem. The judge system executes the submitted answer of source code to provide feedback such as pass, failure, and error messages. Students who receive the feedback except for the pass continues debugging the source code until they are judged to pass. We developed an online judge system to support programming training and analyzed answers submitted by the students and found that many of the students who were not judged to pass that test did not know exactly where they were wrong but continued to solve the problem. The current judge system generally feeds runtime error messages back to students. However, with only runtime error message, it is difficult for student who train to find the wrong part of the answer. Therefore, in this paper, we propose a system that provides the feedback of programming failure by analyzing the control flow of the test cases used in the source code submitted by the student. The proposed system helps students find the wrong parts more quickly by feeding back the paths where faults in the control flow may exist. In addition, we show that this system is applicable to the answer source code that the actual student submitted.