• 한국국방기술학회 논문지
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• 제5권1호
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• pp.1-6
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• 2023

무기체계 개발기간을 고려한 신뢰성 성장관리 시험기간을 설정하여 시험 시료 수를 산정하였다. 최적의 신뢰성 성장관리 시험 설계 조건은 신뢰도 80%, 신뢰수준 60%, 시험기간 6개월이었다. 이 때, 고장이 0번 발생하는 경우 시험 시료 수는 4개, 고장이 1번 발생하는 경우 시험 시료 수가 9개가 필요한 것으로 분석되었다. 본 논문에서 제시한 시료 수 결정 방안을 활용하면, 탐색개발 단계에서 체계개발 단계로 전환 시 신뢰성 성장관리 시험 시료 수 예산을 확보하는데 근거로 활용 가능하다.

• 벤처창업연구
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• 제10권4호
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• pp.27-37
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• 2015

창업이 장려되고 있지만, 창업자에게는 항상 큰 걱정거리로 작용되는데 이는 높은 실패가능성 때문이다. 중소벤처기업 창업이 국가의 새로운 원동력을 창출하는 방법이라는데 동의하지만 실패로 인한 사회적, 경제적 비용은 엄청나며, 창업자 개인이 느끼게 될 좌절감은 말 할 수 없는 충격일 것이다. 다양한 창업관련 교육과 연구가 이루어지고 있지만, 실패에 대한 경각심을 주는 교육과 연구는 거의 없다. 좀 더 다양한 실패사례에 대한 연구가 필요하며, 실패사례는 창업자와 예비창업자들에게 실패에 대한 경각심을 심어주며, 사전준비를 철저히 하게 할 뿐만 아니라 기업의 위기 상황에 대한 시나리오로써 가치가 있을 것이다. 이에 본 연구는 대덕연구단지내에서 약 10년간 활동한 중소벤처기업의 사례를 통해 실패요인 도출 및 시사점을 구하고자 한다. 연구결과, 기업가 특성(의사소통 능력 부족, 경영에 대한 지식 부족)과 경영관리(업무 전문성 부족), 그리고 기술(제품의 독특성 상실, 제품의 확장성 부족)이 실패요인의 근원인 것으로 나타났다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 봄 학술발표회 논문집
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• pp.315-322
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• 1999

The probabilistic keyblock concept which was based upon block theory was applied to the example site by using the observed block moulds data. The more was the block failure likelihood (P(B)) which was defined by the product of the joint combination probability, the shape parameter and the instability parameter, the more were the frequencies of failures observed. If we can acquire these data during a tunnel construction stage, they will be used as a very useful data to construct another tunnel in the neighborhood. Furthermore, a sedimentary rock may have larger P(B) values than a crystalline rock, and for the given P(B) value, the percent block moulds are larger in the former than latter.

• 한국산업정보학회논문지
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• 제16권5호
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• pp.107-114
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• 2011

신제품 개발 또는 개선 과정에 있어서 내구 수명의 평가는 장기간이 소요되는 작업으로서, 제품의 개발 또는 개선 기간에 큰 영향을 미치게 된다. 따라서 고장 메커니즘을 분석하여 제품의 신뢰성을 정확히 평가하는 것은 제품의 초기 시장 진입 기간을 단축하여 시장 경쟁력을 강화하는데 중요한 요소로 작용하게 된다. 본 논문에서는 트랙터의 무상보증기간에 이루어진 고장 데이터에 근거하여 주요 고장 부품에 대한 고장 메커니즘 분석을 통하여 고장형태를 규명하고, 신뢰성 분석을 통하여 파워트레인에 대한 B10 수명을 향상시키기 위한 대상 부품을 규명하였다.

• 한국신뢰성학회지:신뢰성응용연구
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• 제14권4호
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• pp.236-242
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• 2014

Since permanent magnet coupling transfers power by magnetic force without contact, it has little shock, vibration, noise. In case of overload, it protects a pump or a motor which is relatively important by slipping internally. In this study, failure analysis and test evaluation on the permanent magnet coupling have been proposed and the process that reliability of the product improves through design improvement has been presented. And failure cause of typical failure case has been investigated and improvement plan has been presented. Finally, reliability improvement is established by analysis of the test results of before and after acceleration test.

• 품질경영학회지
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• 제27권4호
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• pp.241-255
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• 1999

This paper concerns Reliability Analysis System(RAS) developed by LG Electronics, Inc. for collecting, classifying, and analyzing field failure data. To develop this system, a database for the management of field failure data was built and several functions were included to analyze and assess the product reliability. Nonparametric estimation and cumulative hazard plotting techniques were applied to estimate the reliability for a specific period. This system serves not only engineers in charge of quality but also designers who wish to monitor the reliability of their own products.

• 대한산업공학회지
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• 제38권1호
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• pp.7-16
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• 2012

Manufacturing system design poses many challenges for new factory construction. Factories producing the same product may nevertheless have different layouts. The machining line of the engine shop in an automotive factory is a typical flow line, but the layout concept of the line varies among factories. In this paper, a simulation study on the design concept of the manufacturing system for automotive engines is discussed. For comparison, three types of real engine block lines in different factories are analyzed, and three structures of parallel lines are extracted. The effects of failure distribution on the performance measures of three types of parallel line structures are investigated, and some insights are offered regarding the layout concept.

• 정보학연구
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• 제10권2호
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• pp.47-64
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• 2007

Finite failure NHPP models presented in the literature exhibit either constant, monotonic increasing or monotonic decreasing failure occurrence rates per fault. Accurate predictions of software release times, and estimation of the reliability and availability of a software product require quantification of a critical element of the software testing process : test coverage. This model called enhanced non-homogeneous poission process(ENHPP). In this paper, exponential coverage and S-coverage model was reviewed, proposes the exponentiated exponential coverage reliability model, which maked out efficiency substituted for gamma and Weibull model(2 parameter shape illustrated by Gupta and Kundu(2001). In this analysis of software failure data, algorithm to estimate the parameters used to maximum likelihood estimator and bisection method, model selection based on SSE statistics for the sake of efficient model, was employed.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.59-62
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• 2001

Reliability engineering is regarded as the major and important roll for all industry. And advanced manufacturing systems with high speed and intelligent have been developing for the betterment of machining ability. In this study, we have systemized evaluation of reliability for machinery system. We proposed the reliability assessment and design review method using analyzing critical units of high speed and intelligent machine system. In addition, we have not only designed and developed test bed system for acquiring reliability data, but also apply QFD technique for satisfying quality function which is provided in design phase. From this study, we will expect to guide and introduce the reliability engineering in developing and processing phase of high quality product.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.43-46
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• 1997

Reliability engineering is regarded as the major and important roll for all industry. And advanced manufacturing systems with high sped and intelligent have been developing for betterment of machining ability. In this study, we have systemized evaluation of reliability for machinery system. We proposed the reliability assessment and designed and manufactured reliability test-bed to evaluate reliability. In addition we acquired reliability data using test-bed system and made database to handle reliability data. And also we not only use reliability data by analyzing reliability, but also apply design review method using analyzing critical units of machinery system. Form this study, we will expect to guide and increase the reliability engineering in developing and processing phase of high quality product.