• Title/Summary/Keyword: Automated Analysis

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Automated Analysis Technique Developed for Detection of ODSCC on the Tubes of OPR1000 Steam Generator

  • Kim, In Chul;Nam, Min Woo
    • Journal of the Korean Society for Nondestructive Testing
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    • v.33 no.6
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    • pp.519-523
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    • 2013
  • A steam generator (SG) tube is an important component of a nuclear power plant (NPP). It works as a pressure boundary between the primary and secondary systems. The integrity of a SG tube can be assessed by an eddy current test every outage. The eddy current technique(adopting a bobbin probe) is currently the main technique used to assess the integrity of the tubing of a steam generator. An eddy current signal analyst for steam generator tubes continuously analyzes data over a given period of time. However, there are possibilities that the analyst conducting the test may get tired and cause mistakes, such as: missing indications or not being able to separate a true defect signal from one that is more complicated. This error could lead to confusion and an improper interpretation of the signal analysis. In order to avoid these possibilities, many countries of opted for automated analyses. Axial ODSCC (outside diameter stress corrosion cracking) defects on the tubes of OPR1000 steam generators have been found on the tube that are in contract with tube support plates. In this study, automated analysis software called CDS (computer data screening) made by Zetec was used. This paper will discuss the results of introducing an automated analysis system for an axial ODSCC on the tubes of an OPR1000 steam generator.

An automated analysis tool for the IR absorption spectra of interstellar ices

  • Kim, Chul-Hwan;Lee, Jeong-Eun;Kim, Jaeyeong;Jeong, Woong-Seob
    • The Bulletin of The Korean Astronomical Society
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    • v.46 no.1
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    • pp.57.1-57.1
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    • 2021
  • The icy mantles of interstellar grains are developed by the freeze-out of interstellar molecules and atoms onto grain surfaces. The ice molecules become more complex by surface chemistry induced directly by high energy photons or by the thermal energy diffused over heated grain surface. Therefore, the ice composition is an important tracer of physical conditions where the ices form. Ices have been studied via their absorption features against continuum sources, such as young stellar objects or evolved background stars, in infrared wavelengths. The Spitzer IRS was the most sensitive spectrometer for the observations of infrared ice absorption features. We has been developing an automated analysis tool for the Spitzer IRS spectra, especially for the 15 ㎛ CO2 bending mode. The 15 ㎛ CO2 absorption feature is very useful for the study of accretion process in star formation since its spectral shape varies with thermal condition of the dust grains. Eventually, this tool will cover the whole range of the Spitzer IRS spectrum (5~20 ㎛).

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Digital X-ray Imaging in Dentistry (치과에서 디지털 x-선 영상의 이용)

  • Kim Eun-Kyung
    • Journal of Korean Academy of Oral and Maxillofacial Radiology
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    • v.29 no.2
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    • pp.387-396
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    • 1999
  • In dentistry. RadioVisioGraphy was introduced as a first electronic dental x-ray imaging modality in 1989. Thereafter. many types of direct digital radiographic system have been produced in the last decade. They are based either on charge-coupled device(CCD) or on storage phosphor technology. In addition. new types of digital radiographic system using amorphous selenium. image intensifier etc. are under development. Advantages of digital radiographic system are elimination of chemical processing, reduction in radiation dose. image processing, computer storage. electronic transfer of images and so on. Image processing includes image enhancement. image reconstruction. digital subtraction, etc. Especially digital subtraction and reconstruction can be applied in many aspects of clinical practice and research. Electronic transfer of images enables filmless dental hospital and teleradiology/teledentistry system. Since the first image management and communications system(IMACS) for dentomaxillofacial radiology was reported in 1992. IMACS in dental hospital has been increasing. Meanwhile. researches about computer-assisted diagnosis, such as structural analysis of bone trabecular patterns of mandible. feature extraction, automated identification of normal landmarks on cephalometric radiograph and automated image analysis for caries or periodontitis. have been performed actively in the last decade. Further developments in digital radiographic imaging modalities. image transmission system. imaging processing and automated analysis software will change the traditional clinical dental practice in the 21st century.

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Development of Automated Analysis System for Model Plane Engine Using Fuzzy Knowledge Processing

  • Lee, Joon-Seong;Lee, Shin-Pyo
    • Journal of the Korean Institute of Intelligent Systems
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    • v.12 no.2
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    • pp.171-176
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    • 2002
  • This paper describes a new automated analysis system for model plane engine. An automatic finite element (FE) mesh generation technique, which is based on the fuzzy knowledge processing and computational geometry technique, is incorporated into the system, together with one of commercial FE analysis codes, ANSYS, and one of commercial solid modelers, Designbase, The system allows a geometry model of concern to be automatically converted to different FE models, depending on physical phenomena of plane engine to be analyzed, i.e. deformation analysis, thermal analysis and so on. The FE models are then automatically analyzed by the FE analysis code. Among a whole process of analysis, the definition of a geometry model, the designation of local node patterns, the assignment of material properties and boundary conditions onto the geometry model are only the interactive processes to be done by a user. The interactive operations can be processed in a few minutes. The other processes which are time consuming and labour-intensive in conventional CAE systems are fully automatically performed in a personal computer environment. The proposed analysis system is successfully applied to evaluate a model plane entwine.

Optimization of Sandwich Structures of a Small Aircraft Wing using Automated Aero- Structure Interaction Systems (자동화된 공력-구조 연계 시스템을 이용한 소형항공기 날개 샌드위치구조 최적설계)

  • Park, Chan Woo;Chu, Jae Myeong;Shul, Chang Won;Jun, Seung Moon
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.10
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    • pp.1061-1068
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    • 2013
  • In this research, the design optimization of a composite sandwich has been performed for using as an airplane wing skin. Automated analysis framework for aero-structure interaction is used for calculating load data on the wing. For automated analysis framework, FLUENT is used for computational fluid dynamics (CFD) analysis. CFD mesh is generated automatically by using parametric modeling of CATIA and GAMBIT. A computational structure mechanics (CSM) mesh is generated automatically by the parametric method of the CATIA and visual basic script of NASTRAN-FX. The structure is analyzed by ABAQUS. Composite sandwich optimization is performed by NASTRAN SOL200. Design variables are thicknesses of the sandwich core and composite skin panel plies. The objective is to minimize the weight of the wing and constraints are applied for wing tip displacement, global failure index and local failure indexes.

Automated detection of eeg spindle waveforms based on its local spectrum

  • Chang, Tae-G.;Shim, Shin-H.;Yang, Won-Y.
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10b
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    • pp.257-260
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    • 1993
  • A new method of spindle waveform detection is presented for the automated analysis of sleep EEG. The method is based on the combined application of signal conditioning in the time-domain and local spectrum analyzing in the frequency-domain. The overall detection system is implemented and, tested in real-time with a total of 24 hour data obtained from four subjects. The result shows an average agreement of 86.7% with the visually inspected result.

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이미지 프로세싱을 위한 드릴 마모측정에 관한 연구

  • 양승배;김영일;유봉환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1992.10a
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    • pp.298-301
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    • 1992
  • A digital image processing approach has been adopted to measure the flank wear area, which is very difficult to measure using conventional techniques. Automatic thresholding of the gray-level values of an image is very useful in automated analysis of image. 1-D entropy thresholding technique is used for image processing and analysis of the flank wear area. This strategy provides more information about drill wear conditions and should therefore have a higher reliability than previous methods. This study calulated quantitatively the flank were area of drill by computer program.

Comparisons of EEG waveform distortions caused by the signal conditioning filters

  • Chang, Tae-G.;Cho, Jae-H.;Yang, Won-Y.
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10b
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    • pp.509-513
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    • 1992
  • This paper investigates the EEG waveform distortions caused by the transient responses of various types of signal conditioning filters, which are generally introduced for automated analysis of EEG. This study explicitly simulates the filter responses to the typical EEG waveform models, and compares the distortions. The filter distortion effects are also illustrated with the experiments on real EEG signals.

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Signal Conditioning Filters for EEG Waveforms Detection (EEG신호의 파형감지를 위한 Signal Conditioning 필터에 관한 연구)

  • Chang, Tae-G.;Cho, Jae-H.;Yang, Won-Y.
    • Proceedings of the KIEE Conference
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    • 1992.07a
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    • pp.311-313
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    • 1992
  • Automated analysis of EEG invariably requires the inclusion of a signal conditioning filter. This paper investigates the EEG waveform distortions caused by the transient responses of the various types of signal conditioning filters. This study explicitly simulates the filter responses to the typical EEG waveform models, and compares the distortions.

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