基于正态-逆Wishart先验分布的贝叶斯分类识别方法研究

研究了各总体服从正态分布、分布参数的先验分布均为正态-逆Wishart共轭先验时，如何利用待判样品的预报密度函数，构造后验概率比和分类判别规则，并据此对样品进行分类识别；该方法的特点是充分利用了参数分布的信息，结论简单、直观，并且也不需要假设各总体的协方差阵相同。     

The Identification of Probability Distributions

A method for the parametric identification of probability distributions with respect to the statistical distribution of measurement data, based on a rigorous determination of the probability of agreement is described.__________Translated from Izmeritelnaya Tekhnika, No. 2, pp. 3–9, February, 2005.     

数字电视节目推荐系统结构及推荐算法研究

针对数字电视信息过载问题进行了数字电视节目推荐系统的结构和推荐算法研究。构造了包含信息摄取单元、系统分析单元和推荐信息发送单元的数字电视节目推荐系统结构。提出了节目类型分析法,采用节目类型阈值和节目类型聚类两种形式,分别实现了根据经验值的人工分级和任意簇数的自动聚类,达到了有效寻找观众收视兴趣与所观看节目之间的联系的效果。提出了收视行为分析法,采用收视个体行为分析和收视群体行为分析两种形式,通过观众收视数据推测观众收视兴趣,实现了给观众个体或群体推荐感兴趣的电视节目的目的。     

Unifying measurements in testing measuring instruments

Structural and parametric identification are considered for the error probability distribution for a particular type of measuring instrument. Translated from Izmeritel’naya Tekhnika, No. 10, pp. 13–17, October, 2008.     

管壳式冷凝器设计程序研究

介绍一种管壳式冷凝器的设计计算方法以及按照此方法设计的计算程序,提供程序流程和模块的详细说明。该程序适用于多种管形和制冷剂。设计算例和手工计算结果的比较表明,二者吻合较好,计算程序能够提高设计效率。     

低温送风管路保冷厚度确定方法与程序设计

对低温送风管路保冷厚度进行热经济分析,给出保冷厚度的计算程序和确定方法.认为保冷厚度的设计应综合考虑允许厚度δmin、不凝露厚度δd和经济厚度δe,同时结合管道的外部空气环境等因素进行全面权衡.运用计算程序,通过一个低温送风管路保冷厚度计算实例,说明保冷厚度的确定方法,为制冷空调系统保冷厚度的工程设计及系统优化提供参考.     

改进均衡分布适配的滚动轴承寿命阶段识别

针对不同工况下训练样本与测试样本分布差异导致滚动轴承寿命阶段无法被有效识别的问题,提出改进均衡分布适配的滚动轴承寿命阶段识别方法。采用无重复均匀随机抽样对源域类间样本进行多次均匀随机抽样,得到源域多样本训练集,以减小源域内部样本选择对目标域预测标签的影响;在再生核希尔伯特空间上利用平衡因子μ动态调节边缘分布和条件分布所占权值,并通过迭代的方式不断优化目标域伪标签以减小两域的最大均值差异;利用源域多样本数据集各自的映射矩阵构造多个分类器,经过一致性判别得到目标域样本最终识别结果。在两组滚动轴承寿命阶段数据集上进行实验验证,证明了所提方法的可行性和有效性。     

概括分布的数学特征

重点讨论概括分布的数学特征——导出了概括分布的数学期望、方差、偏度、峰度及其概率 ,得到了概括分布的数学特征与分布参数的关系 ,以说明概括分布密度函数的形状特点     

Providing Unified Measurements in Checking Measuring Instruments

A method is considered for calculating the basic error of a measuring instrument from test data by the employment of structural and parametric identification of probability distributions on the criterion for maximum reproducibility. __________ Translated from Izmeritel'naya Tekhnika, No. 8, pp. 14–18, August, 2005.     

构件粘接强度分类判别二类错误率的计算及应用

本文提出了一种构件粘接强度分类判别中二类错误率的计算方法,其中关于误差函数的计算机算法具有通用性,它可以代替正态分布概率计算的查表方法。     

A generalized computer program for analysis of mixture refrigeration cycles

The growing interest in non-azeotropic refrigerant mixtures for heat pumps and appliances has led to the need for a method of analysing the refrigeration cycle properties of such mixtures. Thermodynamic property tables are not sufficient, because they give no information about the two-phase region, where temperature and vapour and liquid compositions are not constant at constant pressure. This paper describes the computer program CYCLE, which can perform thermodynamic property calculations for subcooled, two-phase, and superheated non-azeotropic mixtures and can analyse a simple refrigerating cycle.     

The optimal confidence probability for compositions of error component distributions for measurement results

It is shown that a fiducial probability of 0.85 is optimal or to a certain lesser extent the interval 0.75–0.90 for a composition of a certain form for the distributions of the residual systematic error and the random error in the total error of measurement results, when that error is approximated by simple or accurate expressions within the ranges respectively of ±1.5 and ±3%. __________ Translated from Izmeritel’naya Tekhnika, No. 5, pp. 26–31, May, 2007.     

部分信息下相邻2-out-of-n:F系统的可靠性分析

对相邻2-out-of-n系统可靠性的研究大都假定部件的失效时间分布是已知的,即部件的可靠度是已知的,然而该假设在许多情况下是不合理的(例如软件系统,人机系统)。本文针对部件的失效时间分布未知,仅仅具有关于部件可靠度的部分信息情况,也就是我们仅仅知道部件的寿命在某些重叠区间的可靠度,利用不精确概率理论分析了该系统,获得了相邻2-out-of-n:F环形与线形系统可靠度上下界的精确公式。最后用例子说明了本文的方法,并指出了在该方向上需要进一步研究解决的问题。     

基于曲率模态和支持向量机的结构损伤位置两步识别方法

支持向量机是一种基于统计学习理论的机器学习算法,能够较好的解决小样本的学习问题。介绍了支持向量机分类和回归算法,将其应用于梁结构的损伤诊断中。以曲率模态参数作为损伤识别指标,提出了基于支持向量机的结构损伤位置两步识别方法:首先根据支持向量机分类算法的概率估计找到可能的损伤位置,重新构造训练样本;然后利用支持向量机回归算法计算精确的损伤位置。通过对悬臂梁仿真计算进行了验证,结果表明:支持向量机在结构损伤诊断领域中具有较好的应用前景。     

氧压机DCS控制系统启动程序改造

14000m3/h空分设备氧压机在试车过程中,因启动程序存在缺陷,启动过程中不能联锁停车。在修改启动程序的过程中发现了控制系统存在的一些新问题,对氧压机的DCS控制系统进行了相应修改,完善控制功能。着重介绍对氧压机在启动过程中因进气压力低而联锁停车功能的修改,达到安全运行的目的。     

A program for identifying the form of the distribution law of random quantities and their modeling

A program for identifying the form of the distribution law of a random quantity is described. The dependence of the optimum number of intervals when constructing histograms from a volume of the sample (10–100,000) and of the kurtosis (in the limits 2–9.65) is determined by computer modeling. Using 50 different functions, the program can also model random quantities with unimodal and bimodal distribution laws. __________ Translated from Izmeritel’naya Tekhnika, No. 5, pp. 9–14, May, 2007.     

Space-based parallel program design process with high-level communication channels

Abstract

In this research, we reduce design complexity of parallel programs by performing the design task at the high level. We devised a formalism of the parallel program design process to support space-based parallel program design. In this formalism, program designs are captured in entity spaces. Entity spaces, including data spaces, tasks, etc. can be subdivided and freely distributed into logical node clusters that are assigned to processes. We designed high-level communication channels for communication among divided subtasks in a parallel program for space-based communication integration. Supported program models range in single program multiple data, multiple program multiple data, and their hybrid model. We designed single-space and cross-space high-level communication channels with various communication topologies. They are specified externally and decoupled from a parallel program. This makes the program logical and easily designed and reused. A practical example is used for illustrating the design process.     

Designing Phase I Shewhart X¯charts: Extended tables and software

Control charts play an important role in Phase I studies, which are conducted to establish process control and generate reference data for parameter estimation and calculation of prospective (Phase II) control limits. Researchers have tabulated the necessary charting constants for the normal theory–based Phase I Shewhart $\overline{X}$ chart for the process mean to achieve a desired nominal false alarm probability given the number of Phase I subgroups, m, up to 15. However, in practice, when parameters are estimated, the currently recommended number of Phase I subgroups is much larger than covered by their tables. Recognizing the need and taking advantage of some recently available software and computing resources, an extension to these tables is provided for m = 3(1)10 , 15(5)30 , 50(25)300 and n = 3 , 5 , 7 , 10. In addition to the tables, an R program is provided to calculate the charting constant, on demand, for user‐given values of nominal false alarm probability, m, and n. An appendix shows the details of how the program should be used.     

Indeterminateness of the results of calibrating measuring instruments in the narrow and the broad sense

The use of the Handbook on the Expression of Indeterminateness in Measurements in the solution of measurement problems involved in calibration of measuring instruments. __________ Translated from Izmeritel’naya Tekhnika, No. 9, pp. 15–20, September, 2007.     

结构概率损伤识别的改进近似贝叶斯计算

结合近似贝叶斯计算(ABC)、Metropolis Hastings(MH)抽样和随机响应面(SRS)提出了一种改进近似贝叶斯计算方法,用于快速估计结构随机参数的后验概率分布,进而识别结构损伤。首先将ABC与MH抽样结合,引入建议分布、接受概率和动态容差来判断抽样样本的准确度,同时通过误差函数对比仿真样本和实测样本的相似性,避免了求解似然函数;然后针对大量抽样样本的响应计算,利用SRS建立结构随机参数与响应之间的显式表达式,实现对响应统计特征值的快速计算;最后基于改进ABC法估计试验钢筋混凝土梁的参数后验概率分布,进一步构建和对比损伤前后梁的概率损伤指标,以此判断梁的损伤位置和程度。研究结果表明:改进ABC法能有效降低参数后验概率分布的求解难度,同时提高了贝叶斯参数识别问题的求解效率,特别是与传统贝叶斯方法相比,改进ABC法可以识别梁的多损伤工况。