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안동근(Dong Geun Ahn),최정희(Jung Hee Choi),장중순(Joong Soon Jang) 한국신뢰성학회 2021 신뢰성응용연구 Vol.21 No.2
Purpose: This paper proposes the methods and procedures to effectively identify and select potential failure modes to perform a process failure modes and effects analysis (FMEA). Methods: Detailed analyses of processes are generally required to prevent possible omissions and improper utilization of potential failure modes. In this study, a process decomposition is proposed for all procedures summarized in the process-flow chart to identify potential failure modes. To provide detailed identifications of the potential failure modes, a method of decomposing the process into work units is described. In addition, the 4M+1E elements, which are required for the decomposition, are found and listed. Each of the operational performance elements determined in this step was found to interfere with the work. Further, a method of identifying potential failure modes is proposed based on the determined work obstructions. Results: The process flow for an example screw-tightening procedure was decomposed into work units based on its process FMEA. A method to predict the potential failure modes for each disassembled work unit was also established based on the obstacles to work performance. Conclusion: By applying the proposed method to a screw-fastening process, it was confirmed that a process FMEA performed without process decomposition found unexpected potential failure modes.
PFEM을 이용한 Process FMEA 수행 방법 연구
안동근 ( Dong-geun Ahn ),차봉환 ( Bong-hwan Cha ),장중순 ( Joong-soon Jang ) 대한설비관리학회 2020 대한설비관리학회지 Vol.25 No.3
FMEA is now considered a prerequisite tool for design, control and improvement. To perform FMEA, a systematic procedure is needed in identifying failure modes, mechanisms and causes. Results prepared in accordance with the previously widely used process FMEA implementation procedure are easy to integrate potential failure modes and causes of each process. However, there are difficulties in situations in which specific failure modes need to be managed intensively. This study is to propose a procedural model for process FMEA based on process function and equipment model (PFEM) which represents the mapping between process functions and corresponding equipments. The process FMEA performance method using PFEM is a methodology that enables them to be found by systematically accessing failure modes, effects, and causes by using a combined VOC and defect history. Such a method may be useful for the equipment focused manufacturing processes like chemical plants. An actual case study is also given.
무기체계 연구개발단계에서의 체계적인 FMEA 실행 방법
안동근(Dong Geun Ahn),유재민(Jae Min Yoo),장중순(Joong Soon Jang) 한국신뢰성학회 2021 신뢰성응용연구 Vol.21 No.1
Purpose: This paper proposes methods and procedures to effectively identify and select potential failure modes in the performance of faliure mode and effect analysis (FMEA). Specifically, a method is proposed to perform FMEA with emphasis on deriving failure mechanisms. Methods: The failure mechanism is known for a design change or improvement preventing recurrence and proactive. Therefore, it is important in designing FMEA to derive failure mechanisms and potential failure modes. This paper presents methods and procedures to derive failure mode and failure mechanism by analyzing past failure cases, usage/environmental condition parts (material), and interaction. Results: The effective design FMEA implementation procedure in the inorganic system development phase was described through the design FMEA practice case for antenna circuit card assembly and HL motor assembly among the drives used in induction weapon systems. Conclusion: The effectiveness of new identification of failure modes can be identified that the existing FMEA had not predicted by applying the proposed effective FMEA implementation methods and procedures to the weapon system development model.
공정평균이 변하는 생산공정의 초기값 및 재설정 수준 결정
안동근 ( Dong-geun Ahn ) 대한설비관리학회 2020 대한설비관리학회지 Vol.25 No.2
Mean shifts may be found in tool wear in machining, drawing, stamping and moulding operations, which make the process quality level deteriorate over time. In such situations, it is necessary to reset or readjust the manufacturing process at regular time basis or by inspection to prevent defective items being produced. Although the deterioration rate may be assumed to be linear in a production cycle, there are many cases where the rate varies after resetting due to the variation of tool characteristics or by using the resharpened tools. In such cases, the deterioration rate should not be assumed to be a deterministic constant but a random variable. This paper is to find an optimal resetting level and starting level for such production processes.
부하-강도 분석을 이용한 격막형 펄스분리장치의 내열강도에 대한 신뢰성 예측 사례연구
이동원(Dong-Won Lee),정세용(Se-Yong Jeong),이방업(Bang-Eop Lee),정규동(Gyoo-Dong Jung),박부희(Boo-Hee Park),안동근(Dong-Geun An),장중순(Joong-Soon Jang) 한국신뢰성학회 2015 신뢰성응용연구 Vol.15 No.2
A stress-strength analysis is used to assess the reliability of a multi-pulse rocket motor system. Main stress is found to be thermal during explosion and the distribution is obtained by simulation. The strength distribution is derived from the results of actual specimen tests. The failure rate of barrier type pulse separation device is estimated.
김수용,이양호,안동근,Kim Soo-Yong,Lee Yang-Ho,An Dong-Geun 한국건설관리학회 2002 건설관리 : 한국건설관리학회 학회지 Vol.3 No.4
EVMS(Earned Value Management System)는 최근 건설 프로젝트를 관리하는데 매우 유용한 도구로 인식되고 있으며, 정부차원에서 적극적으로 도입을 검토하고 있는 선진 관리기법이다. 이 EVMS는 미국방성에 의해 1960년대부터 프로젝트의 효율적인 관리를 위해 개발된 C/SCSC(Cost/schedule Control System Criteria)에 기반을 두고 있으며, 국내외에서 정부발주공사뿐만 아니라 민간발주의 건설프로젝트를 관리하는 도구로 활용하기 위해 연구가 활발하게 진행되고 있다. 본 연구에서는 공정관리 프로그램과 복합작업모델(Work Package Model)을 바탕으로 건설프로젝트의 EV계획단계의 관리계정계획(CAP)을 수립하는데 효과적으로 사용할 수 있는 방안을 제조업의 재고관리모형중의 한 형태로 조립제품의 자원운영계획을 수립하는데 우수한 기법으로 알려진 MRP(Material Requirement Planning)기법을 활용하여 제시하고자 한다. Earned Value Management System(EVMS) is a management technique that is emerging as a valuable tool in the management of all projects, including and in particular construction projects. It is based on C/SCSC that has been released by the U.S. Department of Defense (DOD) in 1967. In a project that employs the earned value management concept, the project's measurable performance plans will be formed with the creation of CAPs. The formation of CAPs is a planning step necessary to form an earned value baseline. In this paper, a method is proposed to form CAPs using Material Requirement Planning(MRP) that is also known as a useful planning tool in the manufacturing industry. An application to a real project has been carried through workpackaging model.