• Title, Summary, Keyword: Reliability assurance

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Reliability Sampling Plans for Lot Assurance (신뢰성 로트보증 샘플링 검사방식)

  • 김종걸;전봉룡
    • Proceedings of the Safety Management and Science Conference
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    • pp.145-151
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    • 2004
  • Reliability assurance problem is an important issue in advanced company with good R&D capacity. In Korea, long-term and large-scale project for reliability improvement and certification have been conducted from 2000, 4 years ago. Generally, assurance is composed of system assurance and lot assurance. For reliability lot assurance. it is prerequisite to development reliability sampling plan with time-saving and minimum cost. In this paper, we aim to investigate previous study on reliability lot assurance focused on reliability sampling plans and propose some suggestions for the future study.

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System Engineering Interfaces of Reliability Engineering in Development of Launch Vehicle (우주발사체 개발사업에서 신뢰성공학의 시스템엔지니어링 인터페이스)

  • Shin, Myoung Ho;Cho, Sang Yeon;Joh, Miok
    • Journal of the Korea Society of Systems Engineering
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    • v.2 no.1
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    • pp.31-36
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    • 2006
  • Development of launch vehicle needs a large-scale and complicated System Engineering discipline interfacing to small-quantity production with special manufacturing processes. In general, the System Engineering discipline of launch vehicle has its relationship with Production, Operations, Product Assurance and Management disciplines and its internal partitions into the functions of System Engineering Integration & Control, Requirements Engineering, Analysis, Design and Configuration and Verification. As a function of Product Assurance, reliability of launch vehicle plays an significant role in risk management, system safety, flight safety and launch certification through design assurance. Moreover, major functions of systems engineering are integrated by means of reliability in the phases of design and verification. Therefore, derailed identification of system engineering interfaces of reliability, and execution of tasks for reliability assurance is required for successful development of launch vehicle. This paper identifies specific pattern and mechanism of the interfaces between reliability and system engineering.

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A Case Study on System Assurance for Platform Screen Door in Urban Transit (도시철도 승강장 스크린도어의 시스템보증 사례 연구)

  • Lee, Hwan-Deok;Jung, Won
    • Journal of Applied Reliability
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    • v.13 no.4
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    • pp.287-298
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    • 2013
  • This paper presents a case study of PSD(Platform Screen Door) system assurance based on EN50126 life-cycle stage. By applying this system assurance, the accidents related to urban light transit railway especially that caused casualties could be reduced tremendously. This case study contributes significantly to the reliability, availability, maintainability and safety of the PSD system. Request For Proposal (RFP) of a rail road operator in which required by RAMS is prepared in which to ensure all system assurance activity and safety assessment are compulsory. The step-by-step activities and related deliverables are used which include functional analysis, FMECA, hazard identification analysis, system hazard analysis, maintainability analysis, FRACAS, and finally verification and validation of the system.

A Study on Reliability Program of the Armed Vehicles (무기체계 신뢰성 보증 방안 프로세스 구축 연구)

  • Lee, Chang Hee;Park, Du Il;Kim, Kyung Roo;Kim, Sang Boo
    • Journal of the Korean Society for Quality Management
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    • v.43 no.3
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    • pp.221-238
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    • 2015
  • Purpose: In this study, A reliability assurance model (or reliability program) is proposed to evaluate the reliability of an armed vehicle. The reliability assurance is performed through the reliability-centered activities during its life cycle of development/design, production, deployment, maintenance, and disposal. Methods: By reflecting the current situations of korea defense industry, a reliability assurance model is built up based on the benchmarking results of world leading companies' best practices in same fields. Results: The proposed reliability program of armed vehicles, which is based on the reliability program of ANSI/GEIA-STD 0009, uses DMAIC process of the six sigma methodology from design phase to testing and evaluation phase. Conclusion: This research is supposed to develop reliability program of armed vehicles by integrating DFSS, DFR and reliability growth process.

기계산업 경쟁력향상을 위한 신뢰성평가 추진 방향

  • 김형의
    • Proceedings of the Korean Reliability Society Conference
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    • pp.57-74
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    • 2000
  • This paper examined current problem of reliability assessment project on mechanical components being domestically pursued, and from the point of new view suggested directions to a comprehensive reliability assurance added quality assurance, suitable to realities in our industries.

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A Study on Warranty and Quality Assurance Model for Guided Missiles Based on Storage Reliability (저장신뢰도 기반의 유도탄 품질보증모델에 대한 연구)

  • Jung, Sanghoon;Lee, Sangbok
    • Journal of Applied Reliability
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    • v.17 no.2
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    • pp.83-91
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    • 2017
  • Purpose: The purpose of this study is to develop a quality assurance model and to determine appropriate warranty period for a guided missile using its field data. Methods: 10 years of actual firing data is collected from the defense industry company and military. Parametric maximum likelihood estimation for a reliability function is determined with the data. Results: The reliability function estimates average lifetime of the missile. That function shows a user requirement, 80% reliability (lifetime) is come up when 8 years have passed, which is longer than the estimates in the missile's development phase. Conclusion: Quality assurance warranty for a guided missile must be established with actual test data. It is necessary to update and modify the reliability prediction and the warranty period with actual field test data.

A Study on the Reliability of Space Launch Vehicle (우주발사체 신뢰성 분석기법에 관한 연구)

  • Yoo, Seung-Woo;Park, Keun-Young;Lee, Kyung-Chol;Lee, Sang-Jun
    • Journal of Applied Reliability
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    • v.4 no.2
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    • pp.105-119
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    • 2004
  • Reliability program is essential to the development of space systems like launch vehicles and satellites, as they are non-repairable after launch and the failure of a launch vehicle resulted in catastrophic consequences for the mission. Foreign advanced space organizations have developed and implemented their own reliability management programs for launch vehicles from the conceptual design stage to the detail processes for the individual components, procedures and test reports. A study on the launch failures and the reliability analysis methods for one-shot devices contained in this paper will contribute to the reliability improvement for Korean launch vehicle and components.

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A Bulk Sampling Plan for Reliability Assurance (벌크재료의 신뢰성보증을 위한 샘플링검사 방식)

  • Kim, Dong-Chul;Kim, Jong-Gurl
    • Journal of the Korea Safety Management & Science
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    • v.9 no.2
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    • pp.123-134
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    • 2007
  • This paper focuses on the in-house reliability assurance plan for the bulk materials of each company. The reliability assurance needs in essence a long time and high cost for testing the materials. In order to reduce the time and cost, accelerated life test is adopted. The bulk sampling technique was used for acceptance. Design parameters might be total sample size(segments and increments}, stress level and so on. We focus on deciding the sample size by minimizing the asymptotic variance of test statistics as well as satisfying the consumer's risk. In bulk sampling, we also induce the sample size by adapting the normal life time distribution model when the variable of the lognormal life time distribution is transformed and adapted to the model. In addition, the sample size for both the segments and increments can be induced by minimizing the asymptotic variance of test statistics of the segments and increments with consumer's risk met. We can assure the reliability of the mean life and B100p life time of the bulk materials by using the calculated minimum sample size.

The Relationship between Internal Marketing and Service Quality in Telecommunication Sector (정보통신 분야 종사자의 내부마케팅노력이 서비스품질에 미치는 효과)

  • An, Gwan-Yeong
    • Proceedings of the Korean Society for Quality Management Conference
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    • pp.439-443
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    • 2007
  • This paper is to investigate the relationship between international marketing and service quality, and the moderating effect of gender in that relationship. The data to make an empirical analysis were gathered from 269 workers in telecommunication sector. Multiple regression analysis revealed that (1) education was positively related with tangibility, reliability, responsiveness, empathy, assurance, and (2) internal communication was positively related with tangibility, reliability, responsiveness, assurance, and (3) delegation of authority was positively related with assurance. Hierarchical multiple regression analysis revealed that (4) compensation was more positively related with reliability in woman, and (5) employment security was more positively related with assurance in man.

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The Relationship between Internal Marketing and Service Quality in Telecommunication Sector (정보통신 분야 종사자의 내부마케팅노력이 서비스품질에 미치는 효과)

  • Ahn, Kwan-Young;Park, Rho-Gook
    • Journal of the Korean Society for Quality Management
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    • v.35 no.4
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    • pp.78-88
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    • 2007
  • This paper is to investigate the relationship between international marketing and service quality, and the moderating effect of gender in that relationship. The data to make an empirical analysis were gathered from 269 workers in telecommunication sector. Multiple regression analysis revealed that (1) education was positively related with tangibility, reliability, responsiveness, empathy, assurance, and (2) internal communication was positively related with tangibility, reliability, responsiveness, assurance, and (3) delegation of authority was positively related with assurance. Hierarchical multiple regression analysis revealed that (4) compensation was more positively related with reliability in woman, and (5) employment security was more positively related with assurance in man.