• Title/Summary/Keyword: automatic test and repair

Search Result 19, Processing Time 0.023 seconds

Vision System Design for Automatic Test and Repair of Steam Generator Holes in Nuclear Power Plants (원자력발전소 증기 발생기의 자동검사 및 수리를 위한 비젼시스템 설계)

  • 한성현
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.15 no.6
    • /
    • pp.5-14
    • /
    • 1998
  • In this paper we propose a new approach to the development of the automatic vision system to examine and repair the steam generator tubes at remote distance. In nuclear power plants, workers are reluctant of works in steam generator because of the high radiation environment and limited working space. It is strongly recommended that the examination and maintenance works be done by an automatic system for the protection of the operator from the radiation exposure. Digital signal processors are used in implementing real time recognition and examination of steam generator tubes in the proposed vision system. Performance of proposed digital vision system is illustrated by simulation and experiment for similar steam generator model.

  • PDF

Design of a Remotely-Controlled Robot System for Automatic Inspection and Repair of Steam Generator Hole in Nucuear Power Plant (원자로 스팀 제너레이터 홀의 수리 및 자동 검사를 위한 원격제어 로봇시스템 설계)

  • 김종규
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.9 no.2
    • /
    • pp.125-137
    • /
    • 2000
  • In this paper we propose a new approach to the development of the automatic vision system to examine and repair the steam generator tubes at remote distance. In nuclear power plants workers are reluctant of works in steam generator because of the high radiation environment and limited working space. It is strongly recommended that the examination and maintenance works be done by an automatic system for the protection of the operator from the radiation exposure. Digital signal processors are used in implementing real time recognition and examination of steam generator tubes in the proposed vision system. Performance of proposed digital vision system is illustrated by simulation and experiment for similar steam generator moldel.

  • PDF

A Very Efficient Redundancy Analysis Method Using Fault Grouping

  • Cho, Hyungjun;Kang, Wooheon;Kang, Sungho
    • ETRI Journal
    • /
    • v.35 no.3
    • /
    • pp.439-447
    • /
    • 2013
  • To increase device memory yield, many manufacturers use incorporated redundancy to replace faulty cells. In this redundancy technology, the implementation of an effective redundancy analysis (RA) algorithm is essential. Various RA algorithms have been developed to repair faults in memory. However, nearly all of these RA algorithms have low analysis speeds. The more densely compacted the memory is, the more testing and repair time is needed. Even if the analysis speed is very high, the RA algorithm would be useless if it did not have a normalized repair rate of 100%. In addition, when the number of added spares is increased in the memory, then the memory space that must be searched with the RA algorithms can exceed the memory space within the automatic test equipment. A very efficient RA algorithm using simple calculations is proposed in this work so as to minimize both the repair time and memory consumption. In addition, the proposed algorithm generates an optimal solution using a tree-based algorithm in each fault group. Our experiment results show that the proposed RA algorithm is very efficient in terms of speed and repair.

A Study on Vision System Design for Automatic Inspection of Steam Generator in Nuclear Power Plants (원전 스팀 제너레이터 세관 자동검사용 비젼시스템 설계에 관한 연구)

  • 한성현;서운학;천영신;이만형
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.4 no.5
    • /
    • pp.658-665
    • /
    • 1998
  • In this paper, we propose a new approach to the development of the automatic vision system to examine and repair the steam generator tubes at remote distance. In nuclear power plants, workers are reluctant of works in steam generator because of the high radiation environment and limited working space. It is strongly recommended that the examination and maintenance works be done by an automatic system for the protection of the operator from the radiation exposure. Digital signal processors are used in implementing real time recognition and examination of steam generator tubes in the proposed vision system. Performance of the proposed digital vision system is illustrated by simulation and experiment for similar steam generator model.

  • PDF

Development of Automatic Inspection and Maintenance Technology for Steam Generator in Nuclear Power Plants (원자력 발전소 증기세관 자동검사 및 보수 기술개발)

  • Seo, W.H.;Jung, D.Y.;Lee, J.W.;Han, S.H.
    • Proceedings of the KSME Conference
    • /
    • 2000.04a
    • /
    • pp.542-547
    • /
    • 2000
  • In this paper, we propose a new approach to the development of the automatic vision system to examine and repair the steam generator tubes at remote distance. In nuclear power plants, workers are reluctant of works in steam generator because of the high radiation environment and limited working space. It is strongly recommended that the examination and maintenance works be done by an automatic system for the protection of the operator from the radiation exposure. Digital signal processors are used in implementing real time recognition and examination of steam generator tubes in the proposed vision system. Performance of proposed digital vision system is illustrated by simulation and experiment for similar steam generator model.

  • PDF

A Study on Vision System Design for Automatic Inspection of Steam Generator in Nuclear Power Plants (원전 스팀제너레이터 세관 자동검사용 로봇 비젼시스템 설계에 관한 연구)

  • 서운학
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 1999.10a
    • /
    • pp.571-578
    • /
    • 1999
  • In this paper, we propose a new approach to the development of the automatic vision system to examine and repair the steam generator tubes at remote distance. In nuclear power plants, workers are reluctant of works in steam generator because of the high radiation environment and limited working space. It is strongly recommended that the examination and maintenance works be done by an automatic system for the protection of the operator from the radiation exposure. Digital signal processors are used in implementing real time recognition and examination of steam generator tubes in the proposed vision system. Performance of proposed digital vision system is illustrated by simulation and experiment for similar steam generator model.

  • PDF

Design of Intelligent Robot Vision System for Automatic Inspection of Steam Generator of Nuclear Plant (원자력 발전소 스팀제너레이터의 자동검사를 위한 지능형 로봇 비젼 시스템 설계)

  • 한성현
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.9 no.6
    • /
    • pp.19-33
    • /
    • 2000
  • In this paper, we propose anew approach to the development of the automatic vision system to examine and repair the steam generator tubes at remote distance. In nuclear power plants, workers are reluctant of works in steam generator because of the high radiation environment and limited working space. It is strongly recommended that the examination and maintenance works be done by an automatic system for the protection of the operator from the radiation exposure. Digital signal processors are used in implementing real time recognition and examination of steam generator tubes in the proposed vision system. Performance of proposed digital vision system is illustrated by simulation and experiment for similar steam generator model.

  • PDF

A Study on optimization of welding process parameters for J-Groove dissimilar metal weld repair of pressurizer heater sleeve in nuclear power plants (원전 가압기 히터슬리브 J-Groove 이종금속 용접부 보수를 위한 용접 공정변수 최적화에 관한 연구)

  • Cho, Hong Seok;Park, Ik Keun;Jung, Kwang Woon
    • Journal of Welding and Joining
    • /
    • v.33 no.1
    • /
    • pp.87-93
    • /
    • 2015
  • This study was performed to develop repair technology for J-Groove dissimilar metal weld of pressurizer heater sleeve in nuclear power plants. Pad, J-Groove automatic welding and mechanical machining equipments to develop repair technology using 'Half Nozzle Repair' were designed and manufactured. To obtain the optimum welding process parameters during Pad temperbead overlay welding, several welding experiments using Taguchi method were conducted. Weldability of Pad overlay weld specimens was estimated by PT/RT test, FE-SEM, EDS and Vickers hardness test. Also, J-Groove welding to adjust weld shape conditions requiring in ASME Code was carried out and its integrity of weld specimens was evaluated through PT/RT test and optical microscope. Consequently, it was revealed that Pad and J-Groove overlay welding for dissimilar metal weld of pressurizer heater sleeve could be possible to meet Code standard without weld defect.

A Fast Redundancy Analysis Algorithm in ATE for Repairing Faulty Memories

  • Cho, Hyung-Jun;Kang, Woo-Heon;Kang, Sung-Ho
    • ETRI Journal
    • /
    • v.34 no.3
    • /
    • pp.478-481
    • /
    • 2012
  • Testing memory and repairing faults have become increasingly important for improving yield. Redundancy analysis (RA) algorithms have been developed to repair memory faults. However, many RA algorithms have low analysis speeds and occupy memory space within automatic test equipment. A fast RA algorithm using simple calculations is proposed in this letter to minimize both the test and repair time. This analysis uses the grouped addresses in the faulty bitmap. Since the fault groups are independent of each other, the time needed to find solutions can be greatly reduced using these fault groups. Also, the proposed algorithm does not need to store searching trees, thereby minimizing the required memory space. Our experiments show that the proposed RA algorithm is very efficient in terms of speed and memory requirements.

OAPR-HOML'1: Optimal automated program repair approach based on hybrid improved grasshopper optimization and opposition learning based artificial neural network

  • MAMATHA, T.;RAMA SUBBA REDDY, B.;BINDU, C SHOBA
    • International Journal of Computer Science & Network Security
    • /
    • v.22 no.4
    • /
    • pp.261-273
    • /
    • 2022
  • Over the last decade, the scientific community has been actively developing technologies for automated software bug fixes called Automated Program Repair (APR). Several APR techniques have recently been proposed to effectively address multiple classroom programming errors. However, little attention has been paid to the advances in effective APR techniques for software bugs that are widely occurring during the software life cycle maintenance phase. To further enhance the concept of software testing and debugging, we recommend an optimized automated software repair approach based on hybrid technology (OAPR-HOML'1). The first contribution of the proposed OAPR-HOML'1 technique is to introduce an improved grasshopper optimization (IGO) algorithm for fault location identification in the given test projects. Then, we illustrate an opposition learning based artificial neural network (OL-ANN) technique to select AST node-level transformation schemas to create the sketches which provide automated program repair for those faulty projects. Finally, the OAPR-HOML'1 is evaluated using Defects4J benchmark and the performance is compared with the modern technologies number of bugs fixed, accuracy, precession, recall and F-measure.