• International Journal of Quality Innovation
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• 제8권1호
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• pp.137-153
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• 2007

Failure mode and effects analysis (FMEA) is a preventive technique in reliability management field. The successful implementation of FMEA technique can avoid or reduce the probability of system failure and achieve good product quality. The FMEA technique had applied in vest scopes which include aerospace, automatic, electronic, mechanic and service industry. The marking process is one of the back ends testing process that is the final process in semiconductor process. The marking process failure can cause bad final product quality and return although is not a primary process. So, how to improve the quality of marking process is one of important production job for semiconductor testing factory. This research firstly implements FMEA technique in laser marking process improvement on semiconductor testing factory and finds out which subsystem has priority failure risk. Secondly, a CCD position solution for priority failure risk subsystem is provided and evaluated. According analysis result, FMEA and CCD position implementation solution for laser marking process improvement can increase yield rate and reduce production cost. Implementation method of this research can provide semiconductor testing factory for reference in laser marking process improvement.

• 한국신뢰성학회지:신뢰성응용연구
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• 제12권1호
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• pp.13-24
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• 2012

This paper applied the Blue Print and FMEA (Failure Mode and Effect Analysis) to education service in order to raise the education service satisfaction. First, the Blue Print is deployed to come up with strategies to overcome the fail possibility point and waiting point. Next, in order to analyze the fail factors and alternative strategies, the Blue Print of education service is applied to FMEA. The results are as follows; first, the ommission from information document by web-mail or e-mail, Second, thing that selected in spite of company uneducated, thing that omitted despite the company is target, and the unsatisfaction of attendee about training contents. Third, the delay of counsel at the telephone reply, erroneous list of course name and attendee at HRD (Human Resource Development), omission of check whether attends or not. Except for unsatisfaction of attendee, all appears at the process that service delivered. And the unsatisfaction of attendee is about education contents. Both is the factor which have influence on the education service quality. The strategies to remove the failure mode are training and manual development on service and work, a thorough management and check of information system like as ERP (Enterprise Resoure Planning), HRD, education institution list DB (Data Base), on-line application system, a development of education program to offer best education that reflect the user needs and continuously changing environment.

• 한국철도학회논문집
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• 제19권5호
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• pp.609-616
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• 2016

승객서비스 장치는 역정보 등 다양한 열차운행 정보를 제공하기 위해 설치된 승객 접점장치로 고장이나 오류 시 열차운행에 영향은 적지만 승객들은 큰 불편을 느끼게 된다. 이에 본 논문에서는 신뢰성기반 유지보수(RCM)를 운영자 입장에서 적용했던 기존 시각에서 벗어나, 승객 입장에서 중요장치인 승객서비스 장치를 분석대상으로 선정하였다. 서울도시철도공사의 데이터를 기초로 승객서비스 장치에 대한 고장분석 및 FMEA/FMECA수행, 심각-발생도 매트릭스 및 위험우선순위평가 결과를 기반으로 통합 설정기를 분석대상으로 선정하였으며, 와이블분포를 통해 고장패턴, 고장률 등 고장해석을 수행하였다. 이를 바탕으로 승객서비스 장치의 고장 최소화 방안을 제시하였다.

• 산업경영시스템학회지
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• 제40권3호
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• pp.27-37
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• 2017

As the global uncertainty of manufacturing has increased and the quality problem has become global, the recall has become a fatal risk that determines the durability of the company. In addition, as the convergence of PSS (product-service system) product becomes common due to the development of IT convergence technology, if the function of any part of hardware or software does not operate normally, there will be a problem in the entire function of PSS product. In order to manage the quality of such PSS products in a stable manner, a new approaches is needed to analyze and manage the hardware and software parts at the same time. However, the Fishbone diagram, FTA, and FMEA, which are widely used to interpret the current quality problem, are not suitable for analyzing the quality problem by considering the hardware and software at the same time. In this paper, a quality risk assessment model combining FTA and FMEA based on defect rate to be assessed daily on site to manage quality and fishbone diagram used in group activity to solve defective problem. The proposed FTA-FMEA based risk assessment model considers the system structure characteristics of the defect factors in terms of the relationship between hardware and software, and further recognizes and manages them as risk. In order to evaluate the proposed model, we applied the functions of ITS (intelligent transportation system). It is expected that the proposed model will be more effective in assessing quality risks of PSS products because it evaluates the structural characteristics of products and causes of defects considering hardware and software together.

• International Journal of Internet, Broadcasting and Communication
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• 제15권3호
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• pp.219-230
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• 2023

With the development of autonomous driving technology, as the use of software in vehicles increases, the complexity of the system increases and the difficulty of development increases. Developments that meet ISO 26262 must be carried out to reduce the malfunctions that may occur in vehicles where the system is becoming more complex. ISO 26262 for the functional safety of the vehicle industry proposes to consider functional safety from the design stage to all stages of development. Specifically at the software level, the requirements to be complied with during development and the requirements to be complied with during verification are defined. However, it is not clearly expressed about specific design methods or development methods, and it is necessary to supplement development guidelines. The importance of analysis and verification of requirements is increasing due to the development of technology and the increase of system complexity. The vehicle industry must carry out developments that meet functional safety requirements while carrying out various development activities. We propose a process that reflects the perspective of system engineering to meet the smooth application and developmentrequirements of ISO 26262. In addition, the safety analysis/verification FMEA processforthe safety of the proposed ISO 26262 function was conducted based on the FCAS (Forward Collision Avoidance Assist System) function applied to autonomous vehicles and the results were confirmed. In addition, the safety analysis/verification FMEA process for the safety of the proposed ISO 26262 function was conducted based on the FCAS (Forward Collision Avoidance Assist System) function applied to the advanced driver assistance system and the results were confirmed.

• 한국신뢰성학회지:신뢰성응용연구
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• 제14권1호
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• pp.71-80
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• 2014

In the mechanical design process various types of errors are bound to occur. In order to prevent such mechanical malfunctions and decrease number of instances of errors, various technique are utilized. The purpose of this research is to demonstrate the effectiveness of the combined service Blueprint and FMEA (Failure Mode and Effect Analysis) by applying such method to machine process. The results are as follows: First, modification can be obtained by discovering the failure mode hidden within the inner side of the blueprint. Second, issues within the company are found when conducting the machine design process that is not visible from the outside. Therefore, potential errors can be effectively resolved by preventing failure mode in advance and eventually high quality of the product could be obtained as well as its reliability.

• 한국안전학회지
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• 제31권2호
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• pp.10-17
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• 2016

The purpose of this paper is to deduct components that are in the group of highest risk(top 10%). the group is conducted for classification into groups by values according to risk priority through risk priority number(RPN) of FMEA(Failure modes and effects analysis) sheet. Top 10% of failure mode among total potential failure modes(72 failure modes) of ESS included 5 BMS(battery included) failure modes, 1 invert failure mode, and 1 cable connectors failure mode in which BMS was highest. This is because ESS is connected to module, try, and lack in the battery part as an assembly of electronic information communication and is managed. BMS is mainly composed of the battery module and communication module. There is a junction box and numerous connectors that connect these two in which failure occurs most in the connector part and module itself. Finally, this paper proposes RPN by each step from the starting step of ESS design to installation and operation. Blackouts and electrical disasters can be prevented beforehand by managing and removing the deducted risk factors in prior.

• 한국철도학회논문집
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• 제14권6호
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• pp.515-525
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• 2011

도시형 자기부상열차 실용화사업에 적용된 유도무선루프방식 열차제어시스템에 대하여 최상위 레벨에서 전체 시스템에 대한 시스템 분류, 기능 분석을 시행하고 차상신호설비, 지상신호설비로 나누어 신뢰도, 가용도, 유지보수도 및 안전도를 수식을 통하여 분석한 결과를 제시하였다. RAM 분석은 신뢰도 블록도(RBD)를 각 장치별로 적용하여 시스템 서비스 가용도를 산출하였고, 안전도 분석은 PHA(예비위험원 분석), FMEA (고장모드영향분석), HAZOP을 통한 각각의 정상사상(Top Event)의 FTA(고장트리분석)을 시행하고 그 결과를 제시하여 RAMS 목표 값에 도달함을 수식을 통하여 증명하였다.

• 한국정보통신학회논문지
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• 제21권11호
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• pp.2052-2060
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• 2017

SOLAS 선박은 SFI group 코드 기준으로 적어도 83종의 장비를 탑재해야 하고, 각각의 장비는 다시 수 개에서 수십 개의 컴포넌트로 구성이 된다. 선박 운항 중에는 이러한 장비의 정상적인 운영이 보장되어야 하고, 문제 발생시 즉각적인 수리를 위하여 원격유지보수의 요구사항이 높다. 본 연구는 항해통신장비의 원격유지보수에 적합한 장비의 분류체계를 제시하고, 적절한 데이터베이스 구조를 도출하고자 했다. 연구 결과, 선박 항해통신장비의 원격유지보수를 위하여, 장비의 분류체계는 장비의 종류, 모델, 컴포넌트로 계층화되어야 하고, 고장모드와 영향분석, 질의응답, 수리이력, 상태정보와 예방정비 등의 테이블을 장비 모델 기준으로 구축하는 것이 효과적임을 알게 되었다. 140개의 항해통신장비 모델과 750개의 컴포넌트에 대하여 데이터베이스를 구축하였고, 실질적인 효과를 평가하기 위하여 선박장비 수리전문가가 클라우드 앱을 이용하여 검색 결과의 유용성을 평가하였다.

• 한국안전학회지
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• 제36권2호
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• pp.10-17
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• 2021

This paper presents the robust design of each component used in the development of an induction bolt heating system for dismantling the high-temperature high-pressure casing heating bolts of turbines in power plants. The induction bolt heating system comprises seven assemblies, namely AC breaker, AC filter, inverter, transformer, work coil, cable, and CT/PT. For each of these assemblies, the various failure modes are identified by the failure mode and effects analysis (FMEA) method, and the causes and effects of these failure modes are presented. In addition, the risk priority numbers are deduced for the individual parts. To ensure robust design, the insulated-gate bipolar transistor (IGBT), switched-mode power supply (SMPS), C/T (adjusting current), capacitor, and coupling are selected. The IGBT is changed to a field-effect transistor (FET) to enhance the voltage applied to the induction heating system, and a dual-safety device is added to the SMPS. For C/T (adjusting current), the turns ratio is adjusted to ensure an appropriate amount of induced current. The capacitor is replaced by a product with heat resistance and durability; further, coupling with a water-resistant structure is improved such that the connecting parts are not easily destroyed. The ground connection is chosen for management priority.