A general repeat inspection plan for dependent multicharacteristic critical components

A component is critical if it causes disaster or a very high cost upon failure. Multicharacteristic critical components exist in many systems. Such components could be a part of an aircraft, space shuttle, a special weapon system or a gas ignition system. In many situations, characteristics’ failures of these components are statistically dependent. In this paper, a new inspection plan for such components is proposed. A mathematical model that depicts the plan is developed and an example demonstrating the results of the model is given. The advantage of this model over the other model where independence of the characteristics’ failure is assumed for the case of dependency is illustrated. The model resulted in an average of 32.4% reduction in cost compared to the situation where the dependency case is solved assuming statistical independence.     

带有中止检查规则（n－i）的CSP－1方案

本文引人转移概率母函数及幂级数等方法讨论带有中止规则（ｎ＊－ｉ）的连续抽样方案ＣＳＰ－１的中止概率Ｐ＊得到了Ｐ＊作为ＣＳＰ－１方案的度量的理论特性，证明了Ｄｏｄｇｅ型ＣＳＰ－１方案与带有中止规则（ｎ＊－ｉ）的ＣＳＰ－１方案具有相同的ＡＯＱ，ＡＦＩ，ＯＣ函数．文末还给出了一些数值结果．     

Bayesian Sampling Plans for Exponential Distribution Based on Type I Censoring Data

We study variable sampling plans for the exponential distribution based on type I censoring data. Using a suitable loss function, a Bayesian variable sampling plan (n _B , t _B , _B ) is derived. For certain prior distributions and loss functions, the numerical values of the Bayesian sampling plans and the associated minimum Bayes risks are tabulated. In terms of Bayes risks, comparisons between the proposed Bayesian sampling plans (n _B , t _B , _B ) and the Bayesian variable sampling plans (n ₀, t ₀, ^L _{T 0}) of Lam (1994, Ann. Statist., 22, 696–711) have been made. The numerical results indicate that under the same conditions, the proposed Bayesian sampling plan is superior to that of Lam in the sense that the Bayes risk of (n _B , t _B , _B ) is less than that of (n ₀, t ₀, ^L _{T 0}).     

基于贝叶斯网络的船舶污染事故应急预案完备性评估

根据船舶污染事故应急预案涉及的事件和事件之间的逻辑关系构架了应急预案的故障树结构, 将故障树结构贝叶斯网络化, 构建了标准贝叶斯网络图, 由此建立一种船舶污染事故应急预案完备性评估的新方法. 利用该方法对市级船舶污染事故应急预案的缺失事件进行了分析, 评估了预案的完备度, 并与其他评估方法进行比较, 验证了该方法有效.     

基于疲劳损伤和倒塌事故的导管架平台结构风险分析

基于风险的检验技术已成为海洋工程领域的研究热点,其优势在于优化检验范围,减少检验成本。通过有限元方法对导管架平台结构的疲劳损伤和倒塌失效进行数值计算,并基于可靠性理论对平台结构关键构件的疲劳失效概率以及该构件疲劳破坏后平台结构的整体倒塌失效概率进行确定,形成风险矩阵,以制定相应的检验计划。在此基础上,对南海某导管架平台结构进行了定量风险评估,形成关键节点和构件的风险矩阵,并给出了相应的检验目标以指导制定检验计划。本文工作可为导管架平台结构制定合理高效的检验计划,在保障平台结构安全作业的同时降低运行费用。     

A POSSIBLE EXPERIMENTAL TEST ON THEGRAVITATION THEORY OF COMPLEX FIELD

By appropriately choosing additional dimensions of space-time, the mass spectrum of mesons was obtained, and the calculated results agree with the experimental data.     

复杂光电产品检验方案的选择

分析新型光电产品的特点,提出以全数检验替代以前光学产品采用抽样检验的方案。     

交流电在Al_2O_3模板中沉积金属机理探讨

以铝阳极氧化形成有序的多孔氧化铝为模板,利用交流电在模板孔洞中沉积金属Ag得到纳米Ag粒子/Al2O3组装体系,透射电镜观察证实在氧化铝模板中有金属纳米Ag粒子存在.分析了交流电能在孔洞中沉积金属的原因是由于Al/Al2O3界面的整流特性,测量了Al/Al2O3界面的I－U关系曲线.     

基于BP神经网络的焊点自动光学检测

提出了一种新的表面组装焊点的自动光学检测分类方法。采用单层环形光源获取焊点图像,并根据归一化分割曲线方程将焊点图像分成四部分,分别提取其特征。使用BP神经网络将焊点按照锡量多少分成三类:少锡,容许和多锡。实验结果证明该方法分类正确率达到了99.2%,具有较高的实用价值。     

基于去模糊空间变换RCNN的毫米波图像目标检测（英文）

提出一种包含去模糊的空间变换区域卷积神经网络的目标检测算法.首先,基于主动毫米波圆柱扫描成像原理对人体进行三维成像(频率24~30 GHz),建立毫米波图像数据集.然后,估计毫米波图像的模糊核,通过卷积去噪网络获得图像先验知识,将其集成到半二次分裂的优化方法中,以实现非盲目去模糊.最后,由定位网络、网格生成器和采样网络三部分组成空间变换网络,将它融入到特征提取网络中,在去模糊后实现目标检测.通过该非盲目去模糊算法得到的图像的峰值信噪比可达27.49 dB,目标检测算法的平均精度可达80.9%.实验结果表明,与现有的先进方法相比,该方法可以有效地提高图像质量和检测精度,为毫米波图像中隐藏危险品的目标检测提供了新的技术支持.