• Title/Summary/Keyword: Cause of failure

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Reliability Modeling and Analysis for a Unit with Multiple Causes of Failure (다수의 고장 원인을 갖는 기기의 신뢰성 모형화 및 분석)

  • Baek, Sang-Yeop;Lim, Tae-Jin;Lie, Chang-Hoon
    • Journal of Korean Institute of Industrial Engineers
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    • v.21 no.4
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    • pp.609-628
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    • 1995
  • This paper presents a reliability model and a data-analytic procedure for a repairable unit subject to failures due to multiple non-identifiable causes. We regard a failure cause as a state and assume the life distribution for each cause to be exponential. Then we represent the dependency among the causes by a Markov switching model(MSM) and estimate the transition probabilities and failure rates by maximum likelihood(ML) method. The failure data are incomplete due to masked causes of failures. We propose a specific version of EM(expectation and maximization) algorithm for finding maximum likelihood estimator(MLE) under this situation. We also develop statistical procedures for determining the number of significant states and for testing independency between state transitions. Our model requires only the successive failure times of a unit to perform the statistical analysis. It works well even when the causes of failures are fully masked, which overcomes the major deficiency of competing risk models. It does not require the assumption of stationarity or independency which is essential in mixture models. The stationary probabilities of states can be easily calculated from the transition probabilities estimated in our model, so it covers mixture models in general. The results of simulations show the consistency of estimation and accuracy gradually increasing according to the difference of failure rates and the frequency of transitions among the states.

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DES Approach Failure Diagnosis of Pump-valve System (펌프-밸브 시스템의 DES 접근론적 Failure Diagnosis)

  • Son, Hyung-Il;Kim, Ki-Woong;Lee, Seok
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.643-646
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    • 2000
  • As many industrial systems become more complex, it becomes extremely difficult to diagnose the cause of failures. This paper presents a failure diagnosis approach based on discrete event system theory. In particular, the approach is a hybrid of event-based and state-based ones leading to a simpler failure diagnoser with supervisory control capability. The design procedure is presented along with a pump-valve system as an example.

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Copula-based common cause failure models with Bayesian inferences

  • Jin, Kyungho;Son, Kibeom;Heo, Gyunyoung
    • Nuclear Engineering and Technology
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    • v.53 no.2
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    • pp.357-367
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    • 2021
  • In general, common cause failures (CCFs) have been modeled with the assumption that components within the same group are symmetric. This assumption reduces the number of parameters required for the CCF probability estimation and allows us to use a parametric model, such as the alpha factor model. Although there are various asymmetric conditions in nuclear power plants (NPPs) to be addressed, the traditional CCF models are limited to symmetric conditions. Therefore, this paper proposes the copulabased CCF model to deal with asymmetric as well as symmetric CCFs. Once a joint distribution between the components is constructed using copulas, the proposed model is able to provide the probability of common cause basic events (CCBEs) by formulating a system of equations without symmetry assumptions. In addition, Bayesian inferences for the parameters of the marginal and copula distributions are introduced and Markov Chain Monte Carlo (MCMC) algorithms are employed to sample from the posterior distribution. Three example cases using simulated data, including asymmetry conditions in total failure probabilities and/or dependencies, are illustrated. Consequently, the copula-based CCF model provides appropriate estimates of CCFs for asymmetric conditions. This paper also discusses the limitations and notes on the proposed method.

Automatic classification of failure patterns in semiconductor EDS Test using pattern recognition (반도체 EDS공정에서의 패턴인식기법을 이용한 불량 유형 자동 분류 방법 연구)

  • 한영신;황미영;이칠기
    • Proceedings of the IEEK Conference
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    • 2003.07b
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    • pp.703-706
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    • 2003
  • Yield enhancement in semiconductor fabrication is important. It is ideal to prevent all the failures. However, when a failure occurs, it is important to quickly specify the cause stage and take countermeasure. The automatic method of failure pattern extraction from fail bit map provides reduced time to analysis and facilitates yield enhancement. This paper describes the techniques to automatically classifies a failure pattern using a fail bit map, a new simple schema which facilitates the failure analysis.

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Flexural-Shear Failure Behavior in I-Shape RC Beams (I형 단면 RC보의 휨-전단파괴 거동에 관한 연구)

  • Moon, Jong-Soo;Yum, Hwan-Seok;Kim, Woo
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.377-380
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    • 1999
  • This paper dscribes an experimental investigation into the cause of flexural-shear failure in RC beams. The experimental variables are bottom flange width and tension bar location. Then these test results were compared and analyzed to deduce the major cause of critical-shear cracking. As a result, it was found that the propagation of the critical shear crack depended exclusively on the intensity of horizontal cracking.

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Identification of Failure Cause for 300MW LP turbine Blade through Vibration Analysis (진동 해석을 통한 300MW급 저압터빈 블레이드의 손상 원인 규명)

  • Kim, Hee-Soo;Bae, Yong-Chae;Lee, Hyun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.05a
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    • pp.794-799
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    • 2005
  • The failure of blades frequently happened in the 300MW LP turbine until now and they are maintaining the blades periodically during outage. So the blade-disk system is analysed by FEM in order to identify the main cause of failure of blade row. It is found that the stress of root's hole is highest in comparison with other parts from the result of the steady stress analysis. Also, the two dangerous frequencies which is related to the resonance condition are found in the interference diagram. one is 1,516 Hz which is related to the operating speed. The other is 2,981 Hz which is related to the 1 nozzle passing frequency. The dynamic stress analysis is per-formed to identify more accurate root cause for failure of blade row. It is confirmed that the dynamic stress of the latter is higher than one of the former. From these results, it is concluded that the former has deeply something to do with the failure of blades more than the latter. Based on versatile investigation and deliberation, the change of blade's grouping is determined to avoid the resonance condition with the operating speed. After the blade grouping is changed, the former frequency vanish completely but the latter is still in existence in the interference diagram. Fortunately, It is confirmed that the dynamic stress of the new blade grouping is lower than one of the old blade grouping. 2 years has passed since modification and the LP turbine is operated well without failure so far.

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Identification of Failure Cause for 300 MW LP Turbine Blade through Vibration Analysis (진동 해석을 통한 300 MW급 저압터빈 블레이드의 손상 원인 규명)

  • Bae, Yong-Chae;Lee, Hyun;Kim, Hee-Soo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.9 s.102
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    • pp.1100-1107
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    • 2005
  • The failure of blades frequently happened in the 300 MW LP(low pressure) turbine until now and they are maintaining the blades periodically during outage. So the blade-disk system is analysed by FEM in order to identify the main cause of failure of blade row. It is found that the stress of root's hole is highest in comparison with other parts from the result of the steady stress analysis. Also, the two dangerous frequencies which is related to the resonance condition are found in the interference diagram. One is 1,316 Hz. The other is 2,981 Hz which is related to the 1 nozzle passing frequency. The dynamic stress analysis is performed to identify more accurate root cause for failure of blade row It is confirmed that the dynamic stress of the former is higher than one of the latter From these results, it is concluded that the former has deeply something to do with the failure of blades more than the tatter. Based on versatile investigation and deliberation, the change of blade's grouping is determined to avoid the resonance condition with the operating speed. After the blade grouping is changed, the former frequency vanish completely but the latter is still in existence in the interference diagram. Fortunately, It is confirmed that the dynamic stress of the new blade grouping is lower than one of the old blade grouping. 2 years has passed since modification and the LP turbine is operated well without failure so far.

Surgical experiences of tissue valve failure (이종심조직판막기능부전에 대한 외과적 요법)

  • Lee, Jae-Won;Seo, Gyeong-Pil
    • Journal of Chest Surgery
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    • v.19 no.1
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    • pp.92-100
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    • 1986
  • Results of reoperation for tissue valve failure were presented with review of current knowledge. Through January 1986, 19 patients required reoperation: 18 had undergone mitral, 2 aortic, and 1 tricuspid valve. Primary tissue failure was the main cause of tissue valve failure: it occurred in 18 valves [15 mitral, 2 aortic, and 1 tricuspid] at a mean postoperative interval of 54-25 months [range 29-120]. During the same period, 2 patients required reoperation for prosthetic valve endocarditis, 1 for paravalvular leakage. The types of valves failed were 12 lonescu-Shiley valves, 5 Hancock valves, and 1 Carpentier-Edwards valve. All 6 patients younger than 15 years of age at first operation had been implanted with lonescu-Shiley valves and failed after a mean interval of 35 months. In contrast, 11 patients older than 15 years had been implanted with 5 Hancock, 6 lonescu-Shiley, and 1 Carpentier-Edwards valve initially, and eventually failed after mean intervals of 81, 53, 47 months each other. The kinds of valves used at reoperation were 8 lonescu-Shiley, 4 Bjork-Shiley, and 6 St. Jude Medical valves for primary tissue failure cases and 3 lonescu-Shiley valves for the other 3 cases. Overall mortality at reoperation was 10%: 5.6% for primary tissue failure, 50% for prosthetic valve endocarditis. In 15 cases [all mitral] primary tissue failure were caused by calcification associated with or without leaflet destruction or fibrous ingrowth, and in 2 cases [all aortic] caused by cusp perforation and tearing without any evidence of calcification. In conclusion: 1 primary tissue failure is the main cause of reoperation in patients with tissue valve failure; 2. the majority of the failed valves is in mitral position; 3. leaflet calcification is the leading pathology of primary tissue failure; 4, reoperation for tissue valve failure may be a major concern, although the mortality is low; 5. the limited durability of tissue valve suggests its use be restricted to selected cases.

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The Effects of a Company's Response Type Strategy due to New Product Failure on Consumers' Negative WOMs : The Moderating Roles of both Cause-related Marketing Activity and Message Strategy (신제품 실패에 따른 기업의 대응유형전략이 소비자의 부정적 구전에 미치는 영향: 공익연계 마케팅 활동여부와 메시지전략의 조절역할)

  • Yun, Hui Kyung;Choi, Young Min;Bae, Sang Wook
    • Journal of Korea Society of Industrial Information Systems
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    • v.23 no.2
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    • pp.93-107
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    • 2018
  • The Purpose of This Study is to Investigate Consumers' Negative WOMs due to the Crisis Response Strategy that Companies Perform in Crisis Situations due to the Failure of New Products. To do This, the Crisis Scenarios and Response Strategies were Manipulated Using a Virtual Laptop Company, and then an Experiment was Performed. The Results of This Experimental Design are as Follows. First, According to The Response Type Strategies, It is Found that Apologizing rather than Denying for the Crisis Response Mitigates the Negative WOMs more. Second, It is Found that the Companies that have Engaged in Cause-Related Marketing Activities before the Crisis Caused by New Product Failure Mitigate Consumers' Negative WOMs more than those which have not. Third, It is Shown that the Message Strategy of the Firm does not Affect Consumers' Negative WOMs. Fourth, the Interaction between the Response Type Strategy and the Cause-Related Marketing Activities are Found to Exist, but the Interaction Between The Response Type Strategy and the Message Strategy does not Appear.

Acute Respiratory Failure during Splanchnic Nerve Block in COPD Patient (만성폐색성 폐질환 환자에서의 내장신경차단중 발생한 급성호흡부전)

  • Chang, Won-Young;Choe, Kun-Chun
    • The Korean Journal of Pain
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    • v.4 no.2
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    • pp.200-204
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    • 1991
  • Neurolytic splanchnic nerve block is a relatively safe and effective method for the relief of intractable pain caused by upper abdominal cancer. We have experienced a case of severe acute respiratory failure during splanchnic nerve block under control of X-ray fluoroscopy. We think that the most likely cause of the acute respiratory failure was an asthmatic attack due to anxiety and dyspnea from the injury or stimulation of the diaphragm and pleura in this case.

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