基于D-S证据理论的XML文档潜在信息获取算法

传统的XML文档检索方法主要是基于关键词匹配的检索,忽略了关键词的语义信息和蕴涵于信息组合中的潜在信息。针对上述问题,提出了基于D-S证据理论的XML文档潜在信息的获取算法。该算法通过引入本体定义了概念间的语义关系和信息的组合方式,提出了基于D-S证据理论的检索模型和指标权重的计算方法,并结合似然函数设计了一个动态的阈值,有效地消除语义匹配过程中存在的不确定性,解决了信息组合中潜在信息的获取问题。此外,还将该算法应用于电子政务领域个人和企业敏感信息的检测中,实验证明了该算法比传统的方法有着更高的查准率和查全率。     

基于小波分析的储粮害虫图像去噪研究

以储粮害虫为研究对象,阐述了小波去噪的基本原理和高频系数置零、硬阈值法、软阈值等几种方法,并提出了一种改进的小波阈值去噪方法,比较了这几种方法在粮虫图像去噪上的优缺点。实验结果表明,改进的新阈值方法能更好的去除噪声,收到更好的效果。     

数据库关联规则挖掘算法研究

该文介绍了数据挖掘、关联规则相关概念,分析了经典的挖掘布尔关联规则频繁项集的算法-Apriori算法,阐述了关联规则的生成过程,并通过实例进行验证。针对Apriori算法的缺陷进行了分析并列举了几种算法优化方法。     

Trail-following responses of the Argentine ant,Iridomyrmex humilis (Mayr), to a synthetic trail pheromone component and analogs

Behavioral evidence indicates that (Z)-9-hexadecenal (Z9-16ALD) is a trail pheromone component ofIridomyrmex humilis, and that the true trail pheromone may be multicomponent. Trail-following responses ofI. humilis workers to several concentrations of syntheticZ9-16ALD, a constituent of the Pavan's gland, were found to be comparable to responses to gaster extract trails containing ca. 100 times lessZ9-16ALD. Of the five aldehyde analogs tested, only (Z)-7-hexadecenal (Z7-16ALD) elicited significant trail-following. However, following responses to severalZ9-16ALD-Z7-16ALD combinations were lower than responses toZ9-16ALD alone. Trails on filter paper of biologically relevant concentrations ofZ9-16ALD lose activity within 2 hr in the laboratory. The release rate ofZ9-16ALD measured from filter paper trails was 0.25 ± 0.10 pg/cm-sec. This was used to estimate the trail-following threshold for this compound of Argentine ant workers.     

An NMR‐MOUSE® for Analysis of Thin Objects

A special unilateral NMR sensor has been designed for investigations of thin samples with a thickness of less than 1 mm and of surface effects of polymers. For use with the bar‐magnet NMR‐MOUSE®, the so‐called “crazy coil” is introduced with a low penetration depth. It is a flat meander coil etched on a printed circuit board with wiggles in the conductors. The design of the new coil and FEM simulations of the B ₁ field are presented. Different applications are discussed by means of illustrative examples. They are the detection of surface damage in rubber samples, the swelling and drying of a latex membrane exposed to cyclohexane vapor mimicking a chemical sensor, and the drying of a thin sprayed adhesive layer.

Bar‐magnet NMR‐MOUSE® with crazy coil.     

On the importance of some surface and interface characteristics in the formation of the properties of adhesive joints

The importance of some relative surface characteristics which determines the strength of adhesive joints: specific surface of substrate , relative contact area β and specific contact area β in the adhesion interaction process were emphasised. Existing and potential methods of experimental evaluation of these characteristics were shortly analysed. The durability of the adhesive joints in water media significantly increases with growth of specific surface ^* of chemically treated substrate evaluated from the SEM micrographs. Specific surface calculated from the experimental data of hexane adsorption measurements for iron particles (particulate model of steel substrate) is more then ten times greater than respective ^* values. The relative contact area β of the Al₂O₃ particles (in wide range of ) with PE melt was in a roundabout way evaluated by experimental determination of the affect of on kinetic of peel strength formation of adhesive joints: Al₂O₃ filled PE-steel. The speculation was based on the ability of Al₂O₃ to adsorb low-molecular products of contact oxidation of PE which takes place in the process of formation of adhesive joints and determines their strength. The ability of sorption in its turn is proportional to efficient value of β. The availability of the Al₂O₃ surface was evaluated.     

基于小波变换的模糊航迹关联算法

航迹关联是实现分布式多传感器信息融合的关键技术.针对传统的模糊关联算法正确关联率低的问题,基于小波变换对传统的模糊关联算法进行了改进,提出一种新的航迹关联算法.首先,通过小波分析对目标航迹数据序列进行处理,获取新的航迹特征;然后,采用模糊均值聚类法确立隶属度函数、综合相似度和阈值判决准则,完成对已获取的新航迹特征的分类关联.仿真实验表明：与模糊算法相比,该算法的正确关联率提高约0.30.     

无可信中心的门限身份认证方案及其博弈分析

提出了一种在无可信中心的情况下由组中成员共同颁发证书的安全门限身份认证方案.该方案利用门限的思想,从n个认证参与者中选取七个参与者依次对待验证者颁发子证书,当待验证者接到七个子证书时可以合成最终的证书.该方案还提出了惩罚机制,并将该机制运用到协议中.该方案将认证过程分为初始化阶段、密钥生成阶段、子证书生成阶段、证书合成阶段和证书验证阶段,并在标准模型下对各个阶段进行了安全性的博弈分析,表明该方案是健壮、安全的.     

开封引黄灌区灌溉条件下稻田土壤盐分阈值研究

结合各生育期水稻耐盐度、各处理实际种前初始土壤含盐量和对应生育期最高的土壤含盐量,分析了各灌溉处理条件下的稻田土壤含盐量在水稻各生育期的动态变化规律和允许初始土壤含盐量阈值.结果表明:控制灌溉及控制灌溉加淋洗条件下,各水稻生育期土壤含盐量均有不同程度降低,随着淋洗水量的增加土壤含盐量逐渐降低,并获得了不同灌溉方式下的允许稻田初始土壤含盐量阈值.此结论对实际应用有指导意义.     

基于RlGamal公钥体制的动态（k，n）门限密钥托管方案

首先对文献[3]所提出的门限密钥分割方案进行了整理分析,具体分析了其动态性,然后在此基础上提出了一种新的基于ElGamal公钥体制的动态（k,n）门限密钥托管方案。该方案具有如下特点：（1）可以防止闽下信道攻击;（2）在监听过程中,监听机构可以对托管代理交给其的子密钥进行验证;（3）解决了“一次监听,永久监听问题”;（4）具有动态性质。