Deep Web集成系统中同类主题数据源选择方法*

提出了一个同类主题的Deep Web 数据源选择方法,该方法通过数据源差异性分析可有效判断出新数据源的内容与集成系统中已有内容的重复度,进而利用查准率和查全率建立质量估计模型评估各数据源的质量,削弱了已有研究中因查准率低对质量评估产生的负面影响。在主流图书类网站上的实验结果表明,该方法能减少系统的负担,同时获取质量较高的同类主题的数据源。     

一种自适应观测矩阵下的信号重构算法*

为提高压缩感知的性能,设计了一种自适应的稀疏观测矩阵,该观测矩阵由0和1组成。信号重构时,利用观测值的位置信息,避免了求解不定方程组,提高了重构速度。采用具有频域稀疏特性的深海隔水管受力参数作为仿真信号,仿真结果表明,观测值数目相同时,自适应观测矩阵下重构算法的平均误差比随机观测矩阵下基追踪算法的平均误差小。     

改进细菌觅食算法求解车间作业调度问题*

针对细菌觅食算法（BFOA）求解高维优化问题时容易陷入局部最优和早熟的问题,引入自适应步长及差分进化算子,并将改进算法用于车间作业调度问题（JSP）中。求解时,设计了一种编码转换方案,从而无须修改BFOA运算规则即可实现对JSP的寻优;同时,采用空闲时间片段优化策略降低了调度问题的复杂性。仿真实验表明,该算法能够跳出局部最优,避免了早熟的问题,调度结果优于原始细菌觅食算法和离散粒子群算法。     

基于粒子群算法的污水处理优化控制策略*

针对污水生化处理控制过程中寻优速度较慢、无法实现高质量的污水处理控制等问题,设计了一种新型粒子群算法。通过基于混沌序列的粒子群初始化方法,增强了粒子群的多样性,提高了算法效率;在寻优过程中,当系统陷入局部最优时,引入扰动,有效地克服了早熟。仿真结果表明,本算法不但保证了寻优速度,而且在保持出水水质符合标准的前提下使污水处理的经济成本达到最优。     

HAPS-GEO卫星空间IP网络结构及端到端QoS方案研究

研究了基于临空平台和GEO卫星的空间IP网络一体化结构以及端到端的服务质量（QoS）方案。依据临空平台和卫星通信网络的特点,首先设计了临空平台-GEO卫星空间IP网络的基本结构,进一步分析了各中转节点的处理职能、空间链路组成形式和建立过程。在通信业务的划分基础上,分析了传统IP网络的端到端QoS方案—综合服务（IntServ）和区分服务（DiffServ）的优缺点,结合临空平台-GEO卫星空间IP网络结构特点,提出了IntServ/DiffServ分区结合端到端QoS方案。通过OPNET仿真,分析了网络的     

基于Web客户因子分析的协同推荐算法*

为解决协同过滤推荐算法中的数据量过大和数据稀疏性的问题,提出了基于客户因子分析的协同推荐算法。该算法利用因子分析将客户向量进行降维处理,得到几个具有代表性的客户因子,然后用这些客户因子对目标客户进行回归分析,进而预测目标客户对待评项目的评分值。最后通过实验证明了该算法的有效性,为以后研究推荐算法提供了一种新的途径。     

FA composition of plasma,red blood cell,and liver phospholipids of newborn piglets fed trans isomers of alpha-linolenic acid

The effects of dietary cis and trans α-linolenic acid (18∶3n−3) on the FA composition of plasma, red blood cell, and liver phospholipids were studied in newborn piglets. Animals were fed for 14 d with one of three diets: a control diet (group A) containing cis 18∶3n−3 at a level of 2.0% of total FA, a diet (group B) in which a part of the 18∶3n−3 acid was isomerized (1.3% of cis 18∶3n−3 and 0.7% of trans 18∶3n−3), or a diet (group C) with 2.0% cis 18∶3n−3 and 0.7% trans 18∶3n−3. Feeding animals with diets containing trans 18∶3n−3 resulted in the presence of trans isomers of 18∶3n−3, trans isomers of EPA, and trans isomers of DHA in phospholipids; however, the level of total trans n−3 PUFA in tissues was less than 0.3% of total tissue FA. In group B, the reduction of dietary amounts of cis 18∶3n−3 was associated with a decrease in individual and total cis n−3 PUFA. In contrast, in group C there was no decrease in tissue n−3 PUFA despite the increased dietary level of trans 18∶3n−3. These results suggest that the isomerization of a part of dietary n−3 PUFA, leading to the reduction of their levels in the diet, could induce a decrease in n−3 PUFA in phospholipids. The physiological effects of trans PUFA are not known and should be considered in future studies.     

Evaluation of Al and Some of Its Alloys as Anode Materials vs γ-MnO2 as Cathode Material and Ore Produced γ-MnO2 vs Zn Anode in KOH Solution

In this study electrochemical performance of Al and some of its alloys （Al-Zn, Al-rvlg and Al-rvln） anodes vs MnO2 cathode were carried out in alkaline solution. The results show that the Al-Zn alloy anode has the best cell capacity among the other alloys. Cell capacity values go in the order Al-Zn〉Al-Mg〉Al〉Al-Mn. This result is probably related to the nature of passive films formed on the surface of the alloys which examined by scanning electron microscopy （SEM）. SEM morphologies of Al and its alloys showed coarse grains of passive films formed on the surface of these anode materials while Al-Mn morphology shows a needle-like structure. Electrolytic manganese dioxide （EMD） produced by electrodepositing on platinum anode from liquor resulting from reduction of low grade pyrolusite ore （β-MnO2） by sulfur slag was characterized as cathode in alkaline Zn-MnO2 batteries. Ore produced sample （EMD1） was performed well in comparison with EMD standard （EMD2） （commercial battery grade electrolytic manganese dioxide, TOSOH-Hellas GH-S）. SEM morphology of Zn anode after cell reaction was carried out and showed that Zn anode has fine grains of passive film on its surface.     

Selective HPLC Analysis of n-Alkyl Hydroperoxides up to C(18)H(38)O(2)

A series of n-alkyl hydroperoxides are separated by HPLC and detected by their postcolumn reaction with horseradish peroxidase and p-hydroxyphenylacetic acid (HPAA) to yield a fluorescent product; several secondary and tertiary hydroperoxides, some 1-hydroxyalkyl hydroperoxides, and a few branched hydroperoxides are also examined. n-Alkyl hydroperoxides up to at least C-18 react with the enzyme with only minimally reduced efficiency at greater alkyl chain length. The effects of the column, the eluent, and the pH of the sample reaching the detector are described. The detection limit with gradient elution ranges from 0.4 μmol L(-)(1) for n-hexyl hydroperoxide to 1 μmol L(-)(1) for n-octadecyl hydroperoxide.     

STL模型特征面片自适应分层算法*

为获得聚苯乙烯泡沫塑料(EPS)异步快速成形机所需的加工路径,提出了一种基于特征面片的Stereolithography(STL)模型自适应分层算法。算法根据模型在分层方向上的特征面片和最小加工厚度来确定分层位置和切割平面,无需坐标变换,可沿任意方向直接获取切片两端截面轮廓信息。该算法采用了一种新方法快速分割边界面片,通过轮廓信息整理可得到点轮廓、非闭合环轮廓、闭合环轮廓。闭合环轮廓经三角化后,可封闭切片端面。本文算法均采用Visual C++ 6.0实现,经实验证明运行稳定有效。