• Title/Summary/Keyword: Switch Point

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A Study on the Safety System Modeling to Prevent Train Accident by Turn-out Failure (분기기 고장 시 열차사고방지를 위한 안전시스템 모델링)

  • Yoo, Kwang-Kiun;Rho, Sung-Chan
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.724-730
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    • 2011
  • A turnout serves to switch train from one line to another. The turnout consists of a Point which is switchs the rail to induce direction, and a Crossing which is cross over two line on the plane surface, and a Lead where is middle section in Point to Crossing. Point machine, consists of a turnout, is important facilities in railway signal, that is safety issue relates in derailment of the train. Recently, train delay and accident frequently occurred because of the turnout include in a point machine trouble of electrical and mechanical. So in order to prevent train accident the research is advanced, install of normal and reverse indication lamp in a point machine, development of adherence detector for sensing the status of adhesion between the stock rails and tongue rails etc. In this paper investigates the problem which is connected with a turnout trouble, include in a point machine, occurrence at the time of train accident, and then proposed to the safety system model in order to prevent the train accident in turnout.

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Implementation of Q3 Adaptor ATM Connection and FR Interworking Management in ATM Switch (ATM 교환기의 Q3 Adaptor ATM 연결 및 FR 연동 관리 구현)

  • 나성욱
    • Proceedings of the Korean Information Science Society Conference
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    • 2002.10e
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    • pp.85-87
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    • 2002
  • 본 논문은 SNMP(Simple Network Management Protocol)기반의 ATM 교환 장비를 CMIP(common management information protocol)기반의 관리망에 연동하기 위한 Q3 Adaptor 기능 중 ATM 연결 관리와 Frame Relay 연동 관리를 소개한다. 본 논문의 ATM연결 관리는 점대점(Point-to-Point Permanent Virtual Connection) PVC(P)로 한정하고, FR 연동 관리는 ATM/FR 연결의 One-to-One PVC로 한정하며 ATM 밀 ATM/FR 연결에 대하여 CMIP Manager, Q3 Adaptor 및 교환 장비의 DB간 불일치 현상을 극복하기 위한 현행화 기능도 소개한다.

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The structure of ATM Switch with the Shared Buffer Memory and The Construction of Switching Network for Large Capacity ATM (대용량 ATM을 위한 공유 버퍼 메모리 스위치 구조 및 교환 망의 구성 방안)

  • 양충렬;김진태
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.1
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    • pp.80-90
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    • 1996
  • The efficienty of ATM is based on the statical multiplexing of fixed-length packets, which are called cells. The most important technical point for realizing ATM switching network is an arrangement of the buffers and switches. Current most ATM switching networks are being achieved by using the switching modules based on the unit switch of $8{\times}8$ 150Mb/s or $16{\times}16$ 150Mb/s, the unit switch of $32{\times}32$150Mb/s for a large scale system is under study in many countries. In this paper, we proposed a new $32{\times}32$(4.9Gb/s throughput) ATM switch using Shared buffer memory switch which provides superior traffic characteristics in the cell loss, delay and throughput performance and easy LSI(Large Scale Integrated circuit). We analytically estimated and simulated by computer the buffer size into it. We also proposed the configuration of the large capacity ATM switching network($M{\times}M$.M>1,000) consisting of multistage to improve the link speed by non-blocking.

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DC-Link Voltage Unbalancing Compensation of Four-Switch Inverter for Three-Phase BLDC Motor Drive (3상 BLDC 전동기 구동을 위한 4-스위치 인버터의 DC-Link 전압 불평형 보상)

  • Park, Sang-Hoon;Yoon, Yong-Ho;Lee, Byoung-Kuk;Lee, Su-Won;Won, Chung-Yuen
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.4
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    • pp.391-396
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    • 2009
  • In this paper, a control algorithm for DC-Link voltage unbalancing compensation of a four-switch inverter for a three-phase BLDC motor drive is proposed. Compared with a conventional six-switch inverter, the split source of the four-switch inverter can be obtained by splitting DC-link capacitor into two capacitors to drive the three phase BLDC motor. The voltages across each of two capacitors are not always equal in steady state because of the unbalance in the impedance of the DC-link capacitors $C_1$ and $C_2$ or the variable current flowed into the capacitor's neutral point in motor control. Despite the unbalance, if the BLDC motor may be run for a long time the voltage across one of the capacitors is more increased. So the unbalance in the capacitors voltages will be accelerated. As a result, The current ripple and torque ripple is increased due to the fluctuation of input current which flows into 3-phase BLDC motor. According to that, the vibration of motor will be increased and the whole system will be instable. This paper presents a control algorithm for DC-Link voltage unbalancing compensation. The sampling from the voltages across each of two capacitors is used to perform the voltage control of DC-Link by using the feedforward controller.

An optimal design of 4${\times}$4 optical matrix switch (4${\times}$4 매트릭스 광스위치의 최적 설계)

  • Choi, Won-Jun;Hong, Song-Cheol;Lee, Seok;Kim, Hwe-Jong;Lee, Jung-Il;Kang, Kwang-Nham;Cho, Kyu-Man
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.32A no.8
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    • pp.153-165
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    • 1995
  • The design procedure of a GaAs/AlGaAs semiconductor matrix optical switch is presented for a simplified tree architecture in the viewpoint of optical loss. A low loss, 0.537 dB/cm, pin type substrate is designed by considering the loss due to imputity doping at 1.3 $\mu$m wavelength. The operating voltage and the device length of a reversed ${\Delta}{\beta}$ electro-optic directional coupler(EODC) swith which is a cross-point device of the 4${\times}$4 matrix optical switch and the bending loss of rib waveguide are caculated as functions of waveguide parameters and bending parameters. There is an optimum bending radius for some waveguide parameters. It is recommened that higher optical confinement conditions such as wide waveguide width and higher rib-height should be chosen for structural parameters of a low loss and a process insensitive 4${\times}$4 matris optical switch. A 4${\times}$4 optical matrix switch which has a 3 dB loss and a 12 volt operating voltage is designed.

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Algorithm for Switch Open Fault Detection of Asymmetric 6-phase PMSM Based on Stationary Reference Frame dq-axis Currents (비대칭 6상 영구자석 동기 전동기의 정지 좌표계 DQ축 전류를 이용한 스위치 개방 고장 검출 기법)

  • Lee, Won-Seok;Kim, Han-Eol;Hwang, Seon-Hwan;Lee, Ki-Chang;Park, Jong-Won
    • Journal of IKEEE
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    • v.26 no.2
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    • pp.265-270
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    • 2022
  • This paper proposes the detection algorithm for switch open fault of asymmetric 6-phase PMSM based on stationary reference frame dq-axis currents. In this paper, target motor has an asymmetric structure in which two upper three windings have an electrical phase difference of 30° and a neutral point is separated. As a result, dual 3-phase PWM inverters and the detection techniques due to open failures of switch are definitely required. In this paper, the dual dq-axis current control method is used for driving the asymmetric 6-phase PMSM and the open fault switch should be detected by using variable all pass filter and low pass filter in order to detect the current amplitude. The effectiveness and usefulness of the proposed method is verified by several experiments.

Multi-View Point switch System Structure & Implementation of Video player in MPEG-4 based (MPEG-4 시스템 기반의 다시점 전환 시스템 구조 및 재생기 구현)

  • Lee, Jun-Cheol;Lee, Jung-Won;Chang, Yong-Seok;Kim, Sung-Ho
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.44 no.1
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    • pp.80-93
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    • 2007
  • This paper suggests structures of the Object Descriptor and the Elementary Stream Descriptor that provide multi-view video services in 3-Dimensional Audio Video technical standards of current MPEG-4. First, it defines that the structures of the Object Descriptor and the Elementary Stream Descriptor on established MPEG-4 system, then distributes individually, and analyzes that. But extension of established system is inappropriate for providing multi-view audio video services connected transmissions and receptions. And, this paper suggests a structure of new Object Descriptor able to switch viewpoints that considers the correlation between each viewpoints, when multi-view video is transmitted. By means of that, it is able to switch viewpoints according to a requirement of a user in a multi-view video services, and reduce overheads for transmitting information about necessary viewpoint.

A New Solar Energy Conversion System Implemented using Single Phase Inverter (새로운 방식의 단상 인버터를 이용한 태양광 시스템 구현)

  • Hong Jeng-Pyo;Kim Tae-Hwa;Won Tae-Hyun;Kwon Soon-Jae;Hong Soon-Ill;Kim Jong-Dal
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.488-491
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    • 2006
  • In this paper proposed method of maximum power point tracking using boost converter for a connected single phase inverter with photovoltaic system. The maximum power point tracking control is based on generated circuit control MOSFET switch of boost converter and single phase inverter uses predicted current control to control four IGBT's switch in full bridge. The predicted current control provide current with sinusoidal wave shape and inphase with voltage. The generation control circuit allows each photovoltaic module to operate independently at peak capacity, simply by detecting of the output power of the system. Furthermore, the generation control circuit attenuates low-frequency ripple voltage, which is caused by the full-bridge inverter, across the photovoltaic modules. Consequently, the output power of system is increased due to the increase in average power generated by the photovoltaic modules. The effectiveness of the proposed inverter system is confirmed experimentally and by means of simulation.

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A Channel Allocation and Data Delivery Scheme Considering Channel Overlapping in Wireless Tactical Networks (군 전술망의 무선 이동 통신 체계의 통신 범위 중첩을 고려한 채널 할당 기법과 데이터 전달 기법)

  • Shin, Hyun-Sup;Chae, Sung-Yoon;Kang, Kyung-Ran;Cho, Young-Jong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.14 no.3
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    • pp.501-508
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    • 2011
  • In this paper, we propose a channel allocation algorithm of MSAP(Mobile Subscriber Access Point) and data delivery scheme exploiting the symbol level network coding. The network is comprised of TS(Tactical Switch) as a backbone node, MSAPs, and TMFTs(Tactical Multi-Function Terminal). The TS performs the channel allocation considering the communication range overlapping between the neighboring MSAPs and applies the symbol level network coding, if necessary, depending on the position of the TMFTs. Assuming the number of available antennas of TMFT and MSAP will be extended to two from one, we propose two schemes: single mode and dual mode. Through the simulation, we show that the proposed delivery scheme provides higher delivery ratio and lower delivery delay compared with the legacy store-and-forward scheme.

Performance Improvement of Current-mode Device for Digital Audio Processor (디지털 오디오 프로세서용 전류모드 소자의 성능 개선에 관한 연구)

  • Kim, Seong-Kweon;Cho, Ju-Phil;Cha, Jae-Sang
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.8 no.5
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    • pp.35-41
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    • 2008
  • This paper presents the design method of current-mode signal processing for high speed and low power digital audio signal processing. The digital audio processor requires a digital signal processing such as fast Fourier transform (FFT), which has a problem of large power consumption according to the settled point number and high speed operation. Therefore, a current-mode signal processing with a switched Current (SI) circuit was employed to the digital audio signal processing because a limited battery life should be considered for a low power operation. However, current memory that construct a SI circuit has a problem called clock-feedthrough. In this paper, we examine the connection of dummy MOS that is the common solution of clock-feedthrough and are willing to calculate the relation of width between dummy MOS for a proposal of the design methodology for improvement of current memory. As a result of simulation, in case of that the width of memory MOS is 20um, ratio of input current and bias current is 0.3, the relation of width between switch MOS and dummy MOS is $W_{M4}=1.95W_{M3}+1.2$ for the width of switch MOS is 2~5um, it is $W_{M4}=0.92W_{M3}+6.3$ for the width of switch MOS is 5~10um. Then the defined relation of MOS transistors can be a useful design guidance for a high speed low power digital audio processor.

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