On the Discrepancy Measures for the Optimal Equal Probability Partitioning in Bayesian Multivariate Micro-Aggregation

Data holders, such as statistical institutions and financial organizations, have a very serious and demanding task when producing data for official and public use. It’s about controlling the risk of identity disclosure and protecting sensitive information when they communicate data-sets among themselves, to governmental agencies and to the public. One of the techniques applied is that of micro-aggregation. In a Bayesian setting, micro-aggregation can be viewed as the optimal partitioning of the original data-set based on the minimization of an appropriate measure of discrepancy, or distance, between two posterior distributions, one of which is conditional on the original data-set and the other conditional on the aggregated data-set. Assuming d-variate normal data-sets and using several measures of discrepancy, it is shown that the asymptotically optimal equal probability m-partition of , with m ^1/d ∈ , is the convex one which is provided by hypercubes whose sides are formed by hyperplanes perpendicular to the canonical axes, no matter which discrepancy measure has been used. On the basis of the above result, a method that produces a sub-optimal partition with a very small computational cost is presented. Published online xx, xx, xxxx.     

一类投影算子的性

讨论有限维实数空间中与Bregman距离相关的投影算子的Lipschtiz连续性．给出投影算子次微分的某些性质．     

广义指数分布下循环序加试验模型的参数估计

针对产品寿命服从广义指数分布的情况,讨论了循环序进应力加速寿命试验的模型,给出相应参数的3种估计方法:极大似然估计法、极大似然估计与最小二乘估计相结合的估计方法,以及最小距离估计和最小二乘估计相结合的估计方法,并利用数据模拟比较了它们的优劣性.     

带电清扫机器人绝缘安全分析

针对高电压环境下,当电介质中掺杂有金属导体时,提出一种带电作业机器人绝缘安全距离的分析方法．对于金属导体引起的电场不规则畸变,采用有限元的方法计算场强以验证是否超出临界值．该方法应用于带电清扫绝缘子机器人的绝缘安全分析中,并通过了试验验证．     

多酸的价成键轨道规则

本文从分子轨道观点出发,对多酸结构提出如下三条规则:1)多酸的价成键分子轨道数N_(vbo)由其中的氧原子数N_o决定,N_(vbo)是N_o的四倍;2)稳定的多酸体系的总价电子数N_(tve)为8N_o N_p,其中N_p为孤电子数;3)稳定的多酸中任意两原子A,B的间距R(A-B)必须满足R(A-B)≥R_e(A-B)-K,其中R_e(A-B)为该两原子的平衡间距,K随单、双及叁键而取不同的常数。应用上述规则讨论了硅酸盐、杂多酸及同多酸的结构与性质。     

基于新选择机制的萤火虫算法

虽然萤火虫算法已经得了广泛的应用,但仍存在收敛精度不高、后期收敛速度慢、易陷于局部最优的缺陷,针对这些缺陷,笔者提出了一种结合吸引度和个体距离的选择机制。通过对经典测试函数的实验仿真结果的分析表明,新的选择机制在收敛精度和避免过早陷于局部最优等方面得到了明显改善,提高了算法性能。     

条斑紫菜不同栽培品系的RAPD研究

选取栽培性状优良、较有代表性的 4个条斑紫菜栽培品系 ,将其自由丝状体采用RAPD标记技术进行分子标记和遗传结构的初步研究 ,用 2 8个随机引物在 4个品系中共扩增出 2 1 5条DNA片段 ,其中 2 3个引物扩增出的DNA片段图谱在 4个品系中是特异性的 ,可以用于品系鉴定 .RAPD图谱的统计结果表明 ,这 4个栽培品系间存在较大的遗传差异 ,而且在单孢子形成能力上差异较大者 ,其遗传距离也较远 .     

The majorization approach to multidimensional scaling for Minkowski distances

The majorization method for multidimensional scaling with Kruskal's STRESS has been limited to Euclidean distances only. Here we extend the majorization algorithm to deal with Minkowski distances with 1≤p≤2 and suggest an algorithm that is partially based on majorization forp outside this range. We give some convergence proofs and extend the zero distance theorem of De Leeuw (1984) to Minkowski distances withp>1.     

区间值直觉Fuzzy度量空间及其完备性

给出区间值直觉Fuzzy数的定义，并引入区间值直觉Fuzzy数间的区间值直觉Fuzzy距离，建立区间值直觉Fuzzy度量空间并讨论其完备性．进一步对n维区间值直觉Fuzzy度量空间作了相应的讨论．     

电磁式静电除尘空气净化机理的研究

提出了电磁式静电除尘空气净化法。从带电粒子的电漂移理论出发，阐明了加平行磁场较加垂直磁场能得到更高的净化效率的理论依据。在更深一步的试验研究基础上，提出粒子初速存在着一个提高净化效率的最佳值，并应用带电粒子电漂移理论解释了一定的集尘板间距内加垂直磁场后，净化效率低于不加磁场情况下的净化效率这一特殊现象，完善了这一新技术。