广义计数型序贯抽样检验

针对计数型产品的可靠性验证试验,提出了一种广义计数型序贯抽样检验方案,该检验方案实际上是经典序贯概率似然比检验的推广.通过构造马尔可夫链模型,研究了广义计数型序贯抽样检验方案的风险计算方法.在此基础上,给出了广义序贯抽样检验方案的制定程序.最后,通过实例分析表明:广义序贯抽样检验方案比国际标准IEC1123所推荐的方案...     

计数序贯抽样检验方案的OC函数和ASN

根据序贯概率比检验的理论,给出计数序贯抽样检验方案的设计原理,得到国家标准GB／T8051—2008中计数序贯抽样检验方案的OC函数和ASN的计算方法。     

在产品规范中正确引用GJB 179

本文针对船舶行业产品标准中在质量一致性检验的计数抽样时出现的问题,介绍了GJB179的基本内涵,剖析了进行检验的程序,并提供了正确引用GJB179的示例,可供船舶及相关行业广大的标准编写者参考。     

使用《计数抽样检验程序及表》时应注意的几个问题

对 GJB 179—86和 GJB179A—96《计数抽样检验程序及表》在执行中出现的有关缺陷的概念、定义、划分、采用方案及检查、验收等问题提出建议。     

药物效用鉴定的序贯抽样检验方法和条件推导

给出了制定药物效用鉴定的序贯抽样检验方案,对未用的同类药品进行随机抽样,利用抽样结果,对剩下的N-n个样品的性能进行推断,得到判断药品是否失效的抽样方法以及有效的抽样截断方案,在减小抽样量的前提下,准确的判断药物是否有效.并对该序贯抽样性能的优劣与固定样本最优检验方法进行了比较,得到在犯同样错误的前提下,序贯抽样检验的样本量比固定样本最优检验的样本量小的多.     

统计抽样方法在外语单词测验中的应用

本文通过分析一般工业产品计数抽样检验方法与外语单词专项测验的特点,发现二者本质相同。利用统计抽样方法不仅可以获得随机样本(试卷),排除某些主观干扰,同时还可以对受试方和考核方风险率进行评价和选择(按四个分级标准,给出了风险率不同的六组测验方案)。此法已为《大学英语词汇系统软件》采用.     

Γ-函数在超几何分布计算中的应用

超几何分布是产品计数抽样检验、可靠性计算中的重要数理统计模型之一,该模型由于需要计算大量的阶乘得出的巨大数据而使计算十分困难,导致应用受限。本文将Γ-函数引入超几何分布的计算,通过matlab语言简单编程,即可完成超几何分布的抽样检验特性曲线和可靠性等有关数据的计算,使超几何分布的计算不再麻烦和困难。     

成败型产品一次抽样检验方案研究

首先推导出了同时能满足检验上限、检验下限、生产方风险、使用方风险要求的一次抽样检验方案设计公式,并用GB/T 5080.5-1985中的数据验证了公式的正确性。之后推论出了同一产品在不同试验方案的鉴定结果可能完全相反。最后建议,应在鉴定试验前尽可能知晓产品的可靠性水平,从而可有目的地选择或设计试验方案,以求产品高概率通过鉴定试验。     

基于调整型的战术导弹批检试验抽样方案设计

为通过批检试验准确检验导弹的质量,提出基于调整型的战术导弹批检试验抽样方案设计思路。调整型抽样检验方法的应用,可适时调整抽样方案的宽严程度,提高检验效率,并为订货方和生产方提供适当的风险保护,把抽样检验和导弹的质量变化联系在一起形成一个动态检验过程。     

关于民爆鉴定检验项目选择的建议

文章论述了我国目前民爆行业技术鉴定、生产鉴定检验所依标准的现状,指出按产品标准引用的检测项目进行鉴定检验的不完善性,提出需要尽快制定我国民爆行业技术鉴定、生产鉴定检验规程并上升为行业强制性标准,给出了以工业炸药为例技术鉴定、生产鉴定及企业质量控制检验项目选择的建议。     

The effect of nonnormality on variables sampling plans

Acceptance sampling plans based on variables have been in use for many years. Recently, there has been a renewal of interest in these plans, because of the relative efficiencies that they offer with respect to attributes sampling regarding sample size. Furthermore, in situations where acceptable quality levels are very small, and a high level of protection is desired, variables sampling is often much more efficient than attributes sampling. An important disadvantage of variables sampling is that the distribution of the parameter being inspected must be known. Most standard variables sampling plans assume that the distribution of this parameter is normal. This article examines the effect of the normality assumption in variables sampling. Methods to detect departures from normality are reviewed.     

Economic design of sampling plans with multi-decision alternatives

For situations where there are several markets with different profit-cost structures, economic attributes sampling plans are developed for determining the market to ship the lot to. Two sampling plans are considered; the fixed-size sampling plan with several levels of acceptance numbers, and the inverse sampling plan with several levels of sample sizes. Linear profit models are constructed which involve four profit/cost components; profit from a conforming item, inspection cost, replacement cost, and cost from an accepted nonconforming item. For fixed-size and inverse sampling plans, methods of finding optimal sampling plans are presented and examples with beta-binomial prior distributions are given.     

军事院校推动国家安全教育研究

提出互联网+时代军队院校面临与军队新型作战能力培养有关的国家安全时代课题,从整合新媒体网络资源、依托校园文化平台、构建国家安全教育体系三方面进行了对策分析,重点探索与新军事变革密切相关的"文化安全、军事话语传播、地缘政治"等议题,以学术活动的顶层设计将国家安全教育融入军事院校学员具有中国特色的军事理论创新。     

党的十七大“建设和谐世界”思想的价值分析

“外交是内政的延续”,通过对“建设和谐世界”思想及其指导下的中国外交实践的深入分析,我们不难看出,“建设和谐世界”思想,可以树立中国的良好国际形象,可以消除国际上对中国和平发展的疑虑和不信任,对提高中国的综合国力、加快中国的和平发展意义深远。     

全球化时代的移民与国家安全：风险评估及其控制

移民具有经济、社会、政治等多重属性,其对国家安全的影响也涉及多个领域,且具有很强的不确定性。而地缘政治地位关键、领土存在国际争议、非劳动力要素供给缺乏弹性、族群认同超越国家认同和政府履行社会管理职能存在结构性缺陷等条件变量的作用,会显著增加移民的安全风险。这意味着控制移民安全风险的关键在于抑制或消除这些条件变量的作用。     

建筑火灾倒塌原因与救援对策

分析了建筑结构与火灾的关系和火灾不同阶段对建筑结构的影响,阐明建筑结构倒塌的原因和影响判定建筑倒塌的因素。对可能倒塌的建筑火灾提出了具体扑救措施。     

New ANSI versions of MIL-STD-414 and MIL-STD-105D

When acceptance sampling plans are applied to measurement characteristics, a choice between application of a variables or an attributes sampling plan must be made. With the recent revision by the American Society for Quality Control for the American National Standards Institute of the ANSI/ASQC Z1.9 variables system and the ANSI/ASQC Z1.4 attributes system, the standards have now been matched so that it is possible to move between them. This article will discuss exploitation of the resulting synergistic relationship to achieve more rational and more effective acceptance sampling.     

Stepwise inspection in Bayesian multiattribute acceptance sampling

Bayesian models for multiattribute acceptance sampling have been developed under the assumption that sampling inspection is carried to completion. A Bayesian multiattribute model for stepwise sampling inspection is proposed, whereby sampling inspection is terminated as soon as the disposition of the inspection lot is determined. An iterative solution procedure is developed for obtaining optimal or near-optimal multiattribute acceptance sampling plans under stepwise sampling inspection. The effect of stepwise sampling inspection on the characteristics of an optimal sampling plan is investigated. It is shown that stepwise sampling inspection achieves a sampling plan with lower total expected cost than complete sampling inspection. In addition, it is shown that the sequence of attributes in a stepwise sampling inspection substantially affects the sampling plan and resultant expected cost. The proposed methodology is used to evaluate various heuristics which may be used to determine the sequence of attributes in a stepwise inspection procedure.