• Title/Summary/Keyword: Diagnostic method

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Diagnosis Method for Power Transformer using Intelligent Algorithm based on ELM and Fuzzy Membership Function (ELM 기반의 지능형 알고리즘과 퍼지 소속함수를 이용한 유입변압기 고장진단 기법)

  • Lim, Jae-Yoon;Lee, Dae-Jong;Ji, Pyeong-Shik
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.66 no.4
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    • pp.194-199
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    • 2017
  • Power transformers are an important factor for power transmission and cause fatal losses if faults occur. Various diagnostic methods have been applied to predict the failure and to identify the cause of the failure. Typical diagnostic methods include the IEC diagnostic method, the Duval diagnostic method, the Rogers diagnostic method, and the Doernenburg diagnostic method using the ratio of the main gas. However, each diagnostic method has a disadvantage in that it can't diagnose the state of the power transformer unless the gas ratio is within the defined range. In order to solve these problems, we propose a diagnosis method using ELM based intelligent algorithm and fuzzy membership function. The final diagnosis is performed by multiplying the result of diagnosis in the four diagnostic methods (IEC, Duval, Rogers, and Doernenburg) by the fuzzy membership values. To show its effectiveness, the proposed fault diagnostic system has been intensively tested with the dissolved gases acquired from various power transformers.

Studies on Early Pregnancy Diagnosis in Dairy Cows (유우(乳牛)의 조기임신진단(早期姙娠診斷)에 관한 연구(硏究))

  • Kim, Kyo-Joon;Kim, Sang-Keun
    • Korean Journal of Veterinary Research
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    • v.20 no.2
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    • pp.135-141
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    • 1980
  • This experiment was carried out to investigate of the early pregnancy diagnosis by finger pressure method, mucus smear method and rectal palpation method in 169 heads of pregnant dairy cow. 1. Pregnancy diagnostic rate of previous, middle and late period of pregnancy by finger pressure methods were 87.3%, 82.0% and 70% respectively. 2. Pregnancy diagnostic rate of previous, middle and late period of pregnancy by mucus smear methods were 83.1%. 94.9% and 95.0% respectively. 3. Pregnancy diagnostic rate of previous, middle and later period of pregnancy by rectal palpation methods were 83.1%, 96.1% and 100% respectively. 4. Pregnancy diagnostic rate of early pregnancy by finger pressure method, mucus smear method and rectal palpation method were 86.7%, 86.8% and 66% respectively. 5. Accordingly, finger pressure method in pregnancy diagnosis is thought to be recommendable because this early diagnostic means are simple with accurate results.

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Syncronous Computer-Capturing Method of Dynamic Images on Fluoroscopic Studies and Applications (투시조영검사에서 동영상의 컴퓨터 동시캡쳐방식과 적응 예)

  • Jang Dong Hyuk;Lee Kyong Lok;Jang Ji Won;Kim Dae Jung;Seo Jung Whan;Park Young Soon
    • Journal of The Korean Radiological Technologist Association
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    • v.29 no.1
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    • pp.25-30
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    • 2003
  • Purpose : The purpose of this study is to present computer-capturing method of dynamic images on fluoroscopic studies, as a substitution for video-recording method, and to help the quantitative analysis of the dynamic studies. Materials and Methods: Compu

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An Open Circuit Fault Diagnostic Technique in IGBTs for AC to DC Converters Applied in Microgrid Applications

  • Khomfoi, Surin;Sae-Kok, Warachart;Ngamroo, Issarachai
    • Journal of Power Electronics
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    • v.11 no.6
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    • pp.801-810
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    • 2011
  • An open circuit fault diagnostic method in IGBTs for the ac to dc converters used in microgrid applications is developed in this paper. An ac to dc converter is a key technology for microgrids in order to interface both distributed generation (DG) and renewable energy resources (RES). Also, highly reliable ac to dc converters are necessary to keep converters in continuous operation as long as possible during power switch fault conditions. Therefore, the proposed fault diagnostic method is developed to reduce the fault detection time and to avoid any other fault alarms because continuous operation is desired. The proposed diagnostic method is a combination of the absolute normalized dc current technique and the false alarm suppression algorithm to overcome the long fault detection time and fault alarm problems. The simulation and experimental results show that the developed fault diagnostic method can perform fault detection within about one cycle. The results illustrate that the reliability of an ac to dc converter interfaced with a microgrid can be improved by using the proposed fault diagnostic method.

A Study of Standard Diagnostic Communications Modules for ECU Diagnostic Communications (ECU 진단통신을 위한 표준 진단통신 모듈 연구)

  • Chang, Moon-Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2022.05a
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    • pp.507-509
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    • 2022
  • In order to collect vehicle internal diagnostic data, it is necessary to collect diagnostic data of ECU (Electronic Control Unit) included in various automotive parts. Diagnostic communication can be used to collect diagnostic data of ECU. In this paper, the method of collecting diagnostic data according to ECU function through standard diagnostic communication and the diagnostic communication module were analyzed. Among the standard modules of AUTOSAR, a standard for automotive electronics used by many automobile manufacturers, the diagnostic communication module was studied, and the process of diagnostic data processing through ECU was studied.

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Design and Implementation of a Web-based Diagnostic Evaluation System for Efficient Teaching Method (교수방법의 효율화를 위한 웹 기반 진단평가 시스템 설계 및 구현)

  • You, Sun-Kyoung;Lee, Mee-Jeong
    • The Journal of Korean Association of Computer Education
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    • v.6 no.3
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    • pp.197-205
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    • 2003
  • For efficient teaching method a teacher should understand the current level of learners. Diagnostic evaluation is generally used to grasp a knowledge level of learners. However, it is not easy to take a diagnostic examination in every class because of time limitation. Accordingly, we propose a web based diagnostic evaluation system for efficient teaching method. In the proposed system, it is possible for teachers to feed diagnostic evaluation questions on the web at any time and for learners to take an online diagnostic examination without space and time limitation. In addition, the proposed system automatically grades the diagnostic evaluation and provides a teacher with various statistical data that can be a criterion to decide a proper teaching level.

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The fundamental principles of pulse feeling(脈診) of "Sanghanlon(傷寒論)" ("상한론(傷寒論)" 맥진(脈診)의 원리)

  • Jeong, Chang-Hyun;Jang, Woo-Chang
    • Journal of Korean Medical classics
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    • v.20 no.1
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    • pp.137-149
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    • 2007
  • Diagnostic method by taking pulse is generally accepted as a clinical diagnosis of today. Theoretical foundation of the method was laid by "Hwangjenaegyeong" and "Nangyeong". Since then, it was quoted by "Sanghallon" and systematically applied to diagnoses by making a diagnosis in the light of pulse condition and symptoms observed so that the original form of the method was shaped thereby. And therefore, theoretical significance of diagnostic method by taking pulse was drawn in this paper to define the theory of pulse feeling. Furthermore, this paper is corroborative of that the purpose of diagnostic method by taking pulse is to diagnose pyo-lee and jang-bu; wind-cold-warmth-heat; and deficiency and excess of gi and blood as well as substantially prove it with the texts of "Sanghallon".

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Remote Measurement for Automobile′s ECU Diagnostic Signals based on the PDA (PDA 기반의 차량 진단신호의 원격 계측)

  • 윤여흥;서지원;이현호;권대규;이영춘
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.279-282
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    • 2002
  • In this paper, we present a new method for monitoring of ECU's self diagnostic signals of vehicle without wire. In order to measure the ECU's self diagnostic signals, the interfaced circuit is designed to communicate ECU and a designed display terminal according to the ISO, SAE regulation of communication protocol standard. A 80C196KC processor is used for communicating ECU's self diagnostic signals and the results are sent to PDA monitoring system. Software on PDA is developed to monitor the ECU's self diagnostic signals using the Embedded Visual C++ compiler in which RS232 port is programmed by half duplex method. The algorithms for measuring the ECU's self diagnostic signals are verified to monitor ECU's state. At the same time, the information to fix the vehicle's problem can be shown on the developed PDA software. The possibility for remote measurement of ECU self diagnostic signal using PDA is also verified through the developed systems and algorithms.

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Diagnosis Accuracy Rate Comparative Study of Each Sasang Constitutions and Sex Distinction by Body Measurement Method between 3D Body Measuring Instrument and Hand-operating (3D체형측정기와 수동측정 방법간의 사상체질별 ${\cdot}$ 성별 진단정확률 비교연구)

  • Kwon, Suk-Dong;Sul, Yu-Kyung;Lee, Eui-Ju;Kim, Kyu-Kon;Kim, Jong-Won
    • Journal of Sasang Constitutional Medicine
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    • v.19 no.1
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    • pp.60-77
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    • 2007
  • 1. Objectives This is the comparative study with hand-operated measurement method and Automatic measurement method, in order to convert the automatic measurement method. 2. Methods We measured the body of patients(hand-operated Width 5 Places and hand-operated circumference 8 place,Automatic Width 5 and automatic circumference 8 place by 3D body measuring instrument) and analyzed the anthropometric data divding into sex&age. 362 patient's data are used in the analysis. 3. Results and Conclusions 1) 1th circumference variable which standing was not a sasang constitutional difference. 2) Diagnostic accuracy rate of the body measurement was 50-80%. 3) Diagnostic accuracy rate of man is higher than Diagnostic accuracy rate of women 4) Diagnostic accuracy rate of Automatic & hand-operated measuring was not a big difference.

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A simple diagnostic statistic for determining the size of random forest (랜덤포레스트의 크기 결정을 위한 간편 진단통계량)

  • Park, Cheolyong
    • Journal of the Korean Data and Information Science Society
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    • v.27 no.4
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    • pp.855-863
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    • 2016
  • In this study, a simple diagnostic statistic for determining the size of random forest is proposed. This method is based on MV (margin of victory), a scaled difference in the votes at the infinite forest between the first and second most popular categories of the current random forest. We can note that if MV is negative then there is discrepancy between the current and infinite forests. More precisely, our method is based on the proportion of cases that -MV is greater than a fixed small positive number (say, 0.03). We derive an appropriate diagnostic statistic for our method and then calculate the distribution of the statistic. A simulation study is performed to compare our method with a recently proposed diagnostic statistic.