• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2001년도 춘계학술대회논문집:21세기 신지식정보의 창출
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• pp.95-98
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• 2001

PL(product Liability, 제조물 책임)이란 제품의 결함에 의하여 소비자에게 생긴 손해를 배상할 의무를 부담하는 것을 말한다. 선진국에서는 제조자에게 엄격 책임(Strict Liability)을 인정하는 민사 책임 법을 시행하고 있으며, 우리 나라에서도 2002년 7월부터 PL 법의 시행을 앞두고 있어 그 방어대책이 절실한 시점이다. 제품의 안전성, 신뢰성 문제의 80%이상인 대부분의 요인이 설계에 있으며, 문제 해결의 근원은 단적인 의미로 설계품질을 높이는 것이라 할 수 있다. 본 발표에서는 PL법 시행에 대비한 제조물 책임 예방대책을 알아 보고, QFD, 신뢰성 전개, FTA, FMEA를 단계별로 연결하여 신뢰성, 안전성 평가의 결과를 정확히 분석할 수 있는 QDRD 기법을 소개하고자 한다.

• 품질경영학회지
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• 제30권4호
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• pp.164-173
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• 2002

The first product liability laws went into effect in Korea in July 2002. A person who suffers personal injury or damage to property due to defects in a product may sue both the manufacturer and the seller of the product under the principles of Korea tort law. This paper presents an integrated methodology which is called the QDRD(Quality deployment and reliability deployment) for hazards analysis in new product designs. QDRD applies QFD, FMEA and FTA to identify the hazards component, hazardous situations and hazardous events which could lead to an accident. An example is provided to demonstrate hazards analysis on a product using the QDRD method.

• 산업경영시스템학회지
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• 제42권4호
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• pp.31-38
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• 2019

The purpose of this study is to provide the priority of the front-loading factors in the design stage of the automotive parts development process in order to efficiently and effectively respond to the demands of the car maker (customer). Front-loading is defined as a strategy in order to improve development performance by shifting the identification and solving of design problems to earlier phases of a product development process. Two approaches of the front-loading are project-to-project knowledge transfer and rapid problem solving. For the study, a survey was conducted on the R&D department in the automobile parts company and analyzed by AHP (Analytic Hierarchy Process) method. The result of the survey shows the cost savings is the highest weight in terms of front-loading effect and in terms of front-loading factors, it gives priorities as "the problems of past project" first, "Design Review" second, "CAE (Computer Aided Engineering)" third, "FMEA (Failure Mode and Effects Analysis)" fourth, "benchmarking" and SR (Sourcing of Requirements). The results of the study will be helpful to provide practical value for improving product design of component development.

• 한국해양공학회지
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• 제30권6호
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• pp.526-534
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• 2016

This study had the goal of designing onboard structures for a pre-pilot mining test (PPMT), which is required for the commercialization of the deep-sea mining industry. This PPMT is planned to validate the performance of a hydraulic lifting system and verify the concept of operating through a moon-pool in the east sea, Korea. All of the onboard equipment and facility were designed by KRISO. Because the test was performed at the first development, it is difficult to determine what risk will occur in the facility. Therefore, risk-based design is required in the facility for the PPMT, which includes the facility layout, failure mode and effect analysis (FMEA), and risk reduction plan. All of the expected performances of the lifting system itself and the onboard facilities were qualitatively validated using the risk-based design.

• 한국전자통신학회논문지
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• 제10권9호
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• pp.1001-1008
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• 2015

본 논문은 안전 시스템의 구성하는 요소 중 전원 장치에 대한 안전 무결성 목표를 설정하고, 설정된 목표를 달성하기 위한 전원 장치의 구조를 설계하였다. 해당 안전 시스템은 안전 최고 등급인 SIL4(Safety Integrity Level 4)를 목표로 하였으며, 철도 응용 분야의 규격인 IEC 62425에 부합하는 구조 설계 및 변경 프로세스를 정립하여 6단계의 기본 구조 설계 방안을 적용하였다. 본 연구에서는 전원 장치의 고장으로부터 시스템의 안전 무결성을 유지할 수 있는 전원 장치의 구조를 FMEA(Failure Modes and Effect Analysis) 기법을 사용하여 도출하였으며, 해당 결과를 적용한 전원 장치는 안전 시스템에 적용할 수 있다는 것을 제시하였다. 최종적으로 전원 장치 모듈에 대한 고장빈도의 정량적 목표치를 제시하였다.

• 한국군사과학기술학회지
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• 제21권5호
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• pp.607-613
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• 2018

Hydraulic systems are widely used in the field of defense, construction machinery, agricultural machinery, and general industries, due to various advantages such as quick response speed and precision control. The defense equipments such as light rescue vehicle is operated in very harsh environments, so hydraulic components used in defense equipment are required to have very high reliability. In particular, hydraulic piston pump is very important component in a hydraulic systems, so life prediction of pump is essential. Therefore, in this study, we analyze the potential failure and the main failure mode of the hydraulic piston pump for the light rescue vehicle through the FMEA analysis, and predict the life of the pump by the accelerated life test considering the usage conditions.

• 대한안전경영과학회지
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• 제2권4호
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• pp.91-102
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• 2000

Nowadays, every kind of system is changed so complex and enormous, it is necessary to assure system reliability, product liability and safety. Fault tree analysis(FTA) is a reliability/safety design analysis technique which starts from consideration of system failure effect, referred to as “top event”, and proceeds by determining how these can be caused by single or combined lower level failures or events. So in fault tree analysis, it is important to find the combination of events which affect system failure. Minimal cut sets(MCS) and minimal path sets(MPS) are used in this process. FTA-I computer program is developed which calculates MCS and MPS in terms of Gw-Basic computer language considering Fussell's algorithm. FTA-II computer program which analyzes importance and function cost of VE consists. of five programs as follows : (l) Structural importance of basic event, (2) Structural probability importance of basic event, (3) Structural criticality importance of basic event, (4) Cost-Failure importance of basic event, (5) VE function cost analysis for importance of basic event. In this study, a method of initiation such as failure, function and cost in FTA is suggested, and especially the priority rank which is calculated by computer-aided decision analysis program developed in this study can be used in decision making determining the most important basic event under various conditions. Also the priority rank can be available for the case which selects system component in FMEA analysis.

• 전기학회논문지
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• 제62권9호
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• pp.1335-1342
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• 2013

Subway is electrified railway system nowadays, in which liquid dielectric transformers have been widely used, though mold type transformers are replacing it. The transformers supplies large electric power and have innate hazards causing accidents under operation. A number of researcher have carried out on failures of it and have oriented to identify transformer's failure causes and how to maintain it healthy state. The transformer failures can cause serious accidents which can provoke economic loss and leads persons to kill. In this paper, we carried out a safety activity to reveal hazards and to estimate risk of subway liquid dielectric transformers using FMEA, HAZOP and What-if methods. In case of installing safety devices in oil immersed transformer, we tried to evaluate an effect on a subsystem's failure rate. We proposed how to design subsystem failure rate and safety device failure rates.

• 전기전자학회논문지
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• 제23권1호
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• pp.261-265
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• 2019

기존 양방향 컨버터와 출력 커패시터를 추진용 배터리 쪽으로 이동시킨 양방향 컨버터의 고장률 변화를 분석한다. 두 컨버터의 회로 구조적 동일성과 차이점을 분석하여 커패시터 위치 변경으로 동작전압이 저감됨을 확인한다. 전압스트레스 인자와 동작온도에 따른 커패시터 부품 고장률을 구하고 양방향 컨버터의 고장나무에 적용하여 컨버터 전체 고장률을 구한다. 동작온도와 커패시턴스 값에 따른 고장률과 평균고장시간을 비교 분석하여 설계 변경으로 인한 장 단점을 분석한다.

• 한국철도학회논문집
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• 제14권5호
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• pp.416-424
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• 2011

본 논문에서는 소출력 무선통신기술을 기반으로 분산 배치된 센서노드의 상태를 감시하고 제어를 수행하는 USN(Ubiquitous Sensor Network)시스템을 철도의 열차제어에 활용하기 위한 신뢰도 모델링결과를 제시한다. 일반적인 USN시스템은 센서노드, 게이트웨이, 서버로 구분할 수 있으며, 본 논문에서는 USN의 구성요소 중 다수의 센서노드간 무선망을 관리하고 정보를 취합하는 게이트웨이를 대상으로 신뢰성 및 안전성을 평가하고 향상시키기 위한 설계방안을 연구하였다. 이를 위해 일반적으로 사용되는 게이트웨이의 신뢰도와 안전무결성수준을 정량적으로 예측하고, 취약부분을 선별한 후 보완설계를 실시하여 향상된 게이트웨이의 신뢰성 및 안전성을 관련 규격에 따라 입증함으로써 열차제어에 대한 USN 게이트웨이 적용 가능성을 검토하였다.