• Title/Summary/Keyword: Fault Localization

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Communication Cable Fault Localization Based on Chirp Signal Parameter Estimation (첩 신호 파라메터 추정 기반 통신 케이블 고장점 탐지에 관한 연구)

  • Lee, Chun-Ku;Han, Seul-Gi;Park, Jin-Bae;Yoon, Tae-Sung
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.1782_1783
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    • 2009
  • Reflectometry that has been used to localize faults on a cable is introduced. One of the key point of reflectometry is finding time delay between the incident and reflected signals. In this paper, we propose new reflectometry that use Gaussian enveloped linear chirp signal, and use Kalman filter to estimate frequency rate parameter of the chirp signal. From the estimated frequency rate parameter, we can measure the time delay. In a simulation assuming open ended cable, the proposed method is proved to give a good estimation results.

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Software Fault Localization using Artificial Neural Network (인공신경망을 활용한 소프트웨어 결함 위치 추정 기법)

  • Jo, Jun-Hyuk;Lee, Jihyun;Jaffari, Aman
    • Proceedings of the Korea Information Processing Society Conference
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    • 2018.10a
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    • pp.550-553
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    • 2018
  • 소프트웨어 시험 후 발견된 결함을 제거하기 위해서는 먼저 해당 결함의 위치를 정확히 찾아야 한다. 결함의 위치를 찾는 작업은 많은 양의 소스코드를 검토해야 하기 때문에 많은 노력을 요구한다. 해당 노력을 줄이기 위해 슬라이싱 기법, 스펙트텀 기법, 모델 기반 기법 등 많은 기법들이 연구되었다. 하지만 이들 연구들은 결함 위치로 추정한 탐색 영역의 범위가 넓어 결과의 효과가 떨어지는 단점이 있다. 그래서 결함 위치 추정의 정확도를 높이고 결함 위치 파악의 효과를 높이기 위해 본 논문은 프로그램 소스 코드 문장에 대한 시험 케이스의 커버리지 정보, 시험의 PAss/Fail 여부, Define-Use의 관계에 있는 문장 정보를 활용하여 각 문장의 결함 의심도를 산출하는 방법을 제안한다. 제안 방법을 실험을 통하여 확인한 결과, 낮은 지역화 비용으로 결함 위치 추정을 할 수 있었다.

A Study on Requirement Analysis of Unmanned Combat Vehicles: Focusing on Remote-Controlled and Autonomous Driving Aspect (무인전투차량 요구사항분석 연구: 원격통제 및 자율주행 중심으로)

  • Dong Woo, Kim;In Ho, Choi
    • Journal of the Korean Society of Systems Engineering
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    • v.18 no.2
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    • pp.40-49
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    • 2022
  • Remote-controlled and autonomous driving based on artificial intelligence are key elements required for unmanned combat vehicles. The required capability of such an unmanned combat vehicle should be expressed in reasonable required operational capability(ROC). To this end, in this paper, the requirements of an unmanned combat vehicle operated under a manned-unmanned teaming were analyzed. The functional requirements are remote operation and control, communication, sensor-based situational awareness, field environment recognition, autonomous return, vehicle tracking, collision prevention, fault diagnosis, and simultaneous localization and mapping. Remote-controlled and autonomous driving of unmanned combat vehicles could be achieved through the combination of these functional requirements. It is expected that the requirement analysis results presented in this study will be utilized to satisfy the military operational concept and provide reasonable technical indicators in the system development stage.

A RFID-Based Multi-Robot Management System Available in Indoor Environments (실내 환경에서 운영 가능한 RFID 기반 멀티 로봇 관리 시스템)

  • An, Sang-Sun;Shin, Sung-Oog;Lee, Jeong-Oog;Baik, Doo-Kwon
    • Journal of the Korea Society of Computer and Information
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    • v.13 no.6
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    • pp.13-24
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    • 2008
  • The multi robot operation technique has emerged as one of the most important research subjects that focus on minimizing redundancy in space exploration and maximizing the efficiency of operation. For an efficient operation of the multi robot systems, the movement of each Single robot in the multi robot systems should be properly observed and controlled. This paper suggests Multi Robot Management System to minimize redundancy in space exploration by assigning exploration space to each robot efficiently to take advantage of the RFID. Also, this paper has suggested fault tolerance technique that detects disable Single robot and substitute it by activated Single robot in order to ensure overall exploration and improve efficiency of exploration. Proposed system overcomes previous fault that it is difficult for central server to detect exact position of robot by using RFID system and Home Robot. Designated Home robot manages each Single robot efficiently and assigns the best suited space to Single robot by using RFID Tag Information. Proposed multi robot management system uses RFID for space assignment, Localization and Mapping efficiently and not only maximizes the efficiency of operation, but also ensures reliability by supporting fault-tolerance, compared with Single robot system. Also, through simulation, this paper proves efficiency of spending time and redundancy rates between multi robot management applied by proposed system and not applied by proposed system.

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Implementation of FlexRay Systems for Vehicle Appliacations (차량 내 통신을 위한 FlexRay 시스템 구현)

  • Jeon, Chang-Ha;Lee, Jae-Kyung;Jang, In-Gul;Chung, Jin-Gyun
    • Proceedings of the IEEK Conference
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    • 2009.05a
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    • pp.182-184
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    • 2009
  • FlexRay is a new standard of network communication system which provides a high speed serial communication, time triggered bus and fault tolerant communication between electronic devices for future automotive and ship applications. FlexRay communication controller(CC) is the core of the FlexRay protocol specification. In this paper, we first design the FlexRay CC protocol specification and function parts using SDL(Specification and Description Language). Then, the system is re-designed using Verilog HDL based on the SDL source. The FlexRay CC system was synthesized using Samsung $0.35{\mu}m$ technology. It is shown that the designed system can operate in the frequency range above 80 MHz. In addition, to show the validity of the designed FlexRay system, the FlexRay system is combined with sound source localization system in Robot applications. The combined system is implemented using ALTERA Excalibur ARM EPXA4F672C3. It is shown that the implemented system operates successfully.

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Implementation of FlexRay Communication Controller Protocol and its Application to a Robot System (FlexRay 프로토콜 설계 및 로봇 시스템 응용)

  • Kang, Hyun-Soo;Xu, Yi-Nan;Kim, Yong-Eun;Chung, Jin-Gyun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.6
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    • pp.1-7
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    • 2008
  • FlexRay is a new standard of network communication system which provides a high speed serial communication, time triggered bus and fault tolerant communication between electronic devices for future automotive applications. FlexRay communication controller (CC) is the core of the FlexRay protocol specification. In this paper, we first design the FlexRay CC protocol specification and function parts using SDL (Specification and Description Language). Then, the system is re-designed using Verilog HDL based on the SDL source. The FlexRay CC system was synthesized using Samsung $0.35\;{\mu}m$ technology. It is shown that the designed system can operate in the frequency range above 80 MHz. In addition, to show the validity of the designed FlexRay system the FlexRay system is combined with sound source localization system in Robot applications. The combined system is implemented using ALTERA Excalibur ARM EPXA4F672C3. It is shown that the implemented system operates successfully.

A Study on MPLS OAM Functions for Fast LSP Restoration on MPLS Network (MPLS 망에서의 신속한 LSP 복구를 위한 MPLS OAM 기능 연구)

  • 신해준;임은혁;장재준;김영탁
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.27 no.7C
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    • pp.677-684
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    • 2002
  • Today's Internet does not have efficient traffic engineering mechanism to support QoS for the explosive increasing internet traffic such as various multimedia traffic. This functional shortage degrades prominently the quality of service, and makes it difficult to provide multi-media service and real-time service. Various technologies are under developed to solve these problems. IETF (Internet Engineering Task Force) developed the MPLS (Multi-Protocol Label Switching) technology that provides a good capabilities of traffic engineering and is independent layer 2 protocol, so MPLS is expected to be used in the Internet backbone network$\^$[1][2]/. The faults occurring in high-speed network such as MPLS, may cause massive data loss and degrade quality of service. So fast network restoration function is essential requirement. Because MPLS is independent to layer 2 protocol, the fault detection and reporting mechanism for restoration should also be independent to layer 2 protocol. In this paper, we present the experimental results of the MPLS OAM function for the performance monitoring and fault detection 'll'&'ll' notification, localization in MPLS network, based on the OPNET network simulator

Instantaneous Frequency Estimation of the Gaussian Enveloped Linear Chirp Signal for Localizing the Faults of the Instrumental Cable in Nuclear Power Plant (가우시안 포락선 선형 첩 신호의 순시 주파수 추정을 통한 원전 내 계측 케이블의 고장점 진단 연구)

  • Lee, Chun Ku;Park, Jin Bae;Yoon, Tae Sung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.7
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    • pp.987-993
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    • 2013
  • Integrity of the control and instrumental cables in nuclear power plant is important to maintain the stability of the nuclear power plants. In order to diagnose the integrity of the cables, the diagnostic methods based on reflectometry have been studied. The reflectometry is a non-destructive method and it is applicable to diagnose the live cables. We introduce a Gaussian enveloped linear chirp reflectometry to diagnose the cables in the nuclear power plants. In this paper, we estimate the instantaneous frequency of the Gaussian enveloped linear chirp signal by using the weighted robust least squares filtering to localize the impedance discontinuities in the class 1E instrumental cable.

The Study of Flow Rate Performance and Engine Application with LPG Composition Rate for LPi Fuel Supplying System Consisted of Turbine Type Pump (터빈방식 연료펌프로 구성된 LPi 연료공급 시스템의 LPG 조성비에 따른 토출성능 및 엔진적용성에 관한 연구)

  • Lim, Mu-Chang;Myung, Cha-Lee;Park, Sim-Soo;Park, Jeong-Nam;Kim, Sung-Kun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.3
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    • pp.99-105
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    • 2007
  • Currently, BLDC fuel pump was applied on LPi vehicle using 3rd fuel supply system as liquified phase LPG injection method had already shown better performance than others. Its cost, however, is rather expensive because of drawbacks such as complicated structure, a fault of localization of system. In this work, demonstration system for a developed turbine type fuel pump to replace BLDC system was setup and investigated. This study results that fuel mass flow rate of turbine type pump and injection performance of injector were better compared to BLDC type. Comparing flow rate of summer LPG with that of winter LPG, the flow rate decreased about 25% using winter LPG. Performance applying turbine type LPi fuel pump to engine is confirmed.

Time-Frequency Domain Reflectometry based on Real-Time Spectrum Estimation for Detection and Localization of a Fault on a Coaxial Cable (실시간 스펙트럼 추정기에 기반한 시간-주파수 영역에서의 동축케이블 결함 검출 기법)

  • Doo, Seung-Ho;Ra, Won-Sang;Kwak, Ki-Seok;Yoon, Tae-Sung;Park, Jin-Bae
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.300-301
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    • 2007
  • 본 논문에서는 실시간 스펙트럼 추정기에 기반하여 시간-주파수 영역 반사파 계측 시스템에서의 동축케이블 결함을 검출하는 방법을 제안한다. 시간-주파수 영역 반사파 계측 시스템은 가우시안 포락선(Gaussian Envelop)모양의 첩 신호를 기준신호로 하여 도선에 반사파를 분석하는 기법으로써 타 방법에 비하여 높은 정확도를 자랑하는 것으로 알려져 있다. 하지만 결함 위치를 추정하기 위해 Wigner 시간 주파수 분포 함수를 이용하므로 계산량 증가에 따른 실시간 구현이 어렵다는 단점이 있었다. 이러한 단점을 극복하기 위하여 본 논문에서는 LMS 스펙트럼 추정기를 이용한 시간-주파수 영역 반사파 계측 시스템의 구현방법을 새롭게 제안한다. 제안된 기법은 실제 동축케이블에 대한 실험결과를 통하여 그 성능을 입증하도록 한다.

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