• 제목/요약/키워드: Sampling Procedures

검색결과 278건 처리시간 0.025초

ISO 3951, 계량조정형 샘플링 검사규격 (ISO 3951, Sampling Procedures and Charts for Inspection by Variables for Percent Nonconforming)

  • 홍성훈;이승환
    • 품질경영학회지
    • /
    • 제23권1호
    • /
    • pp.1-14
    • /
    • 1995
  • ISO 3951 (1989) Sampling Procedures and Charts for Inspection by Variables for Percent Nonconforming is an acceptable quality level (AQL) type sampling scheme. Sample size code letters and inspection levels in this International Standard correspond to those given in the ISO 2859 (1989), a standard for sampling plans by attributes. Two acceptance sampling procedures can be used ; tabular and graphical methods. The graphs could be used in less critical applications while the tabular method would be available for those familiar with MIL-STD-414 tables and to confirm the results of the graphs when needed. The sampling procedures of the ISO 3951 are matched to the ISO 2859 to enable us to move between them. Composite OC and ASN curves are given for AQL 2.5% and code letter F.

  • PDF

국방 품질보증 활동 강화를 위한 샘플링 방법 개선: 전투물자 및 탄약 분야 사례 위주 (Sampling Procedures Enhancement in Government Defense Quality Assurance Procedures: Case Studies in Combat Force Support Material & Ammunition Areas)

  • 안남수;정지선;정운권;황우열;박상원
    • 품질경영학회지
    • /
    • 제40권3호
    • /
    • pp.245-258
    • /
    • 2012
  • Purpose: Recently, many quality issues are aroused in military forces, such as failures in K-series weapons, combat boots defects and 40mm ammunition explosion accident. To address these problems, the one and only government defense quality assurance agency, DTaQ(Defense Agency for Technology & Quality) tried to improve many quality assurance procedures and introduced new systems such as MRA(Manufacturing Readiness Assessment), TRA(Technology Readiness Assessment), and etc. However, as the amount of war supplies increasing every year, the resource(budget and manpower) for quality assurance is limited. Therefore, DTaQ had difficulty to handle the issue efficiently and effectively, and we propose the method to address this problem. Methods: The most popular quality assurance technique is a sampling method, in this research, we first review the many sampling techniques and compare the strength and weakness of each method. After then, we selected the most appropriate sampling techniques and applied the procedures in combat force support material and ammunition areas. Results: We can reduce the number of samples dramatically, thus the required amount of labor time and money can be saved. Also, the new sampling technique enforces the supplier to produce the product which meets the target value(desirable value). Conclusion: We can reduce the number of samples dramatically, thus the required amount of labor time and money can be saved. Also, the new sampling technique enforces the supplier to produce the product which meets the target value(desirable value). Lastly, since the new sampling method requires many numerical calculations, we developed a simple android OS smart-phone application which can be used easily in field.

Preparation and Consideration of Sample Collection in Undeclared Areas for Denuclearization Verification

  • Kim, Dong Yeong;Kim, Giyoon;Lee, Jun;Lim, Kyung Taek;Chung, Heejun;Seo, Jihye;Kim, Myungsoo
    • 방사성폐기물학회지
    • /
    • 제19권4호
    • /
    • pp.479-489
    • /
    • 2021
  • The Republic of Korea is expected to participate in the denuclearization verification activities by the International Atomic Energy Agency (IAEA) in case any neighboring countries declared denuclearization. In this study, samples for the verification of nuclear activities in undeclared areas were selected for the denuclearization of neighboring countries, and the appropriateness of the procedures was considered. If a country with nuclear weapons declares denuclearization, it must be accompanied by the IAEA's verification regarding nuclear materials and weapons in the declared and undeclared areas. The analysis of the process samples or on-site environmental samples and the verification of undeclared nuclear facilities and materials aid in uncovering any evidence of concealment of nuclear activity in undeclared areas. Therefore, a methodology was established for effective sampling and analysis in accordance with proper procedures. Preparations for sampling in undeclared areas were undertaken for various potential scenarios, such as, the establishment of zones according to radiation dose, methods of supplying electricity, wireless communication networks, targets of sampling according to characteristics of nuclides, manned sampling method, and unmanned sampling method. Through this, procedures were established for pre- and post-site settings in preparation for hazards and limiting factors at nuclear inspection sites.

집합체의 검사와 샘플링 (Inspection and Sampling for Bulk Materials)

  • 최성운
    • 대한안전경영과학회:학술대회논문집
    • /
    • 대한안전경영과학회 2007년도 추계학술대회
    • /
    • pp.305-309
    • /
    • 2007
  • This study introduces acceptance sampling plans and procedures for the inspection of bulk materials. This paper also presents statistical aspects of sampling bulk materials such as general principles and sampling of particulate materials.

  • PDF

ANSI/ASQ Z1.4 - 2003 계수형 샘플링 검사 (Sampling Procedures for Inspection By Attributes : ANSI/ASQ Z1.4 - 2003)

  • 최성운
    • 대한안전경영과학회:학술대회논문집
    • /
    • 대한안전경영과학회 2005년도 추계학술대회
    • /
    • pp.371-376
    • /
    • 2005
  • ANSI/ASQ Z1.4, Sampling Procedures and Tables for Inspection By Attributes, has recently been published by American Society for Quality is based upon the MIL-STD-105E. This paper discusses the features of the ANSI/ASQ Z1.4 - 2003 and Dodge - Romig Sampling.

  • PDF

비용을 고려한 신뢰성 샘플링검사 설계에 관한 연구 (The Study on the Failure Rate Sampling Plan Considering Cost)

  • 조재립
    • 산업경영시스템학회지
    • /
    • 제23권59호
    • /
    • pp.97-103
    • /
    • 2000
  • This study considers the design of life test sampling inspection plans by attributes for failure rate level qualification at selected confidence level. The lifetime distribution of products is assumed to be exponential. MIL-STD-690C and KS C 6032 standards provide this procedures. But these procedures have some questions to apply in the field. The cost of test and confidence level($1-{\beta}$ risk) are the problem between supplier and user. So, we suggest that the optimal life test sampling inspection plans using expected cost model considering product cost, capability, environmental test cost, etc.

  • PDF

WTO/TBT 협정에 따른 KS 규격의 부합화에 관한 연구 (A Study on the Conformity of KS Standards according to Agreement on WTO/TBT)

  • 김진규
    • 산업경영시스템학회지
    • /
    • 제26권4호
    • /
    • pp.12-22
    • /
    • 2003
  • The purposes of this study are to investigate the conformity of Korean Standards(KS) according to agreement on WTO/TBT, and to propose systematic frameworks of preparation, adoption, and application for KS in our enterprises. Significant changes in this establishment, revision, and abrogation include the following divisions; i) statistics-vocabulary and symbols, ii) Shewhart control chart, iii) statistical interpretation of data, iv) sampling procedures for inspection by attributes, v) sequential sampling plans for inspection.

Bootstrap Median Tests for Right Censored Data

  • Park, Hyo-Il;Na, Jong-Hwa
    • Journal of the Korean Statistical Society
    • /
    • 제29권4호
    • /
    • pp.423-433
    • /
    • 2000
  • In this paper, we consider applying the bootstrap method to the median test procedures for right censored data. For doing this, we show that the median test statistics can be represented by the differences of two sampler medians. Then we review to the re-sampling methods for censored dta and propose the test procedures under the location translation assumption and Behrens-Fisher problem. Also we compare our procedures with other re-sampling method, which is so-called permutation test through an example. Finally we show the validity of bootstrap median test procedure in the appendix.

  • PDF

破壤檢査詩의 最小費용 샘플링 檢査方式 (A minimum cost sampling inspection plan for destructive testing)

  • 趙星九;裵道善
    • Journal of the Korean Statistical Society
    • /
    • 제7권1호
    • /
    • pp.27-43
    • /
    • 1978
  • This paper deals with the problem of obtaining a minimum cost acceptance sampling plan for destructive testing. The cost model is constructed under the assumption that the sampling procedure takes the following form; 1) lots rejected on the first sample are acreened with a non-destructive testing, 2) the screening is assumed to be imperfect, and therefore, after the screening, a second sample is taken to determine whether to accept the lot of to scrap it. The usual sampling procedures for destructive testing can be regarded as special cases of the above one. Utilizing Hald's Bayesian approach, procedures for finding the global optimal sampling plans are given. However, when the lot size is large, the global plan is very different to obtain even with the aid of an electronic computer. Therefore a method of finding suboptimal plan is suggested. An example with uniform prior is also given.

  • PDF