基于核Batch SOM聚类优化的语义Web服务发现机制研究

如何快速、准确和高效地发现满足用户需求的Web服务已成为制约服务发展的瓶颈之一。该文针对现有Web服务发现机制中存在的效率低下和查准率不高的两个主要问题,提出了一个基于核Batch SOM神经网络聚类优化的语义Web服务发现框架。该框架分别在服务表示阶段引入WordNet和隐含语义索引技术对Web服务进行语义扩展和概念语义空间降维;在服务分类阶段利用核机学习理论改进一类适用于Web服务分类的核Batch SOM神经网络算法;在服务匹配阶段提出一种基于核余弦相似性测度的Web服务匹配算法。最后,真实Web服务数据集上的实验结果验证了所提出方法的可行性。     

半监督空谱局部判别分析的高光谱影像特征提取

为充分利用高光谱影像中蕴含的空谱特征,提出了一种半监督空谱局部判别分析的高光谱影像特征提取算法（S4LFDA）。鉴于高光谱数据集具有空间一致性,首先将像元进行空间重构,保存高光谱数据的近邻关系;其次引入光谱信息散度重构像元间的相似度;为了充分利用大量无标签样本提高算法性能,采用模糊C均值聚类算法对样本进行聚类分析得到伪标签;然后通过增加规范化项到局部力导引算法（FDA）的类内散度矩阵和类间散度矩阵中,以此保持无标签样本的聚类结构一致性;最后通过局部FDA算法来保持有标签样本类间散度最大化和类内散度最小化并求解最佳投影向量。S4LFDA算法既保持了数据集在光谱域的可分性,又保持了像元在空间区域内的近邻关系,合理利用有标签样本及无标签样本,提高了算法的分类性能。在Pavia University和Indian Pines数据集上进行实验,总体分类精度达到95.60%和94.38%。与其他维数约简算法相比,该算法有效提高了地物分类性能。     

K-means改进算法在电力用户聚类辨识中的应用

科学、准确的用户用电特征分析对掌握负荷发展变化规律,提高电力需求预测的准确性,保障系统规划和经济运行具有重要意义。文中在对K-means算法深入研究的基础上,结合电力负荷数据海量、多维等特点,通过归一化处理,异常数据剔除,改进的二分K-means算法进行自聚类,对各优化算法进行分析,克服了传统K-means算法对异常数据敏感和初始聚类中心的随机性问题。实验结果表明,优化的自聚类算法能够提高分类的准确性,提高收敛效率,实现用户数据特征自动辨识分类。     

DBSCAN聚类改进算法与支持向量机结合的道路路锥识别研究

基于激光雷达传感器,提出了一种道路路锥识别方法。首先,在传统DBSCAN聚类算法的基础上改进算法搜寻核心点的方式,对雷达所采集的数据进行快速地分割、聚类。接着,分析类簇,对每帧数据的类簇进行特征采样并赋予标签值。最后,通过支持向量机(SVM)训练样本数据,利用网格化搜索与交叉验证法优化SVM参数,得到类簇分类模型,用于识别路锥。实验结果表明,改进后的DBSCAN算法计算效率有了显著提升,并且对点云的聚类更具有针对性。经过多次随机数据集检测,分类模型的准确率保持在93以上,实现了对路锥的有效识别。     

基于聚类核函数的最小二乘支持向量机高光谱图像半监督分类

针对大规模的高光谱数据分类,为了利用未标签样本所含信息,来提升分类器性能,提出了一种半监督分类算法。该算法根据聚类假设,即属于同一类地物的样本点在聚类中被分为同一类的可能性较大的原则来改进核函数,采用基于光谱角度量的K均值聚类算法对样本集进行聚类,根据多次聚类的结果,构造包袋核函数,然后利用加法和乘法运算将包袋核函数和RBF核函数组合成新的核函数,从而把未标签样本信息融入分类器。而且采用最小二乘支持向量机,将标准支持向量机的二次规划问题转换为求解线性方程组的问题。高光谱实测数据实验表明了本文方法的优越性。      

基于ontology抽取优化初始选择的检索结果聚类

 本文针对互联网的数据量的不断增加,准确搜索引擎的作用日益困难的问题,为了提高搜索引擎返回结果结构化聚类的效果,让信息的定位更迅速,本文采用基于标签的聚类算法,并使用自然语言处理技术中的依存句法分析和词典资源,深度挖掘语义结构,提出基于优化初始选择的K均值聚类方法.本文深入分析K均值聚类算法特点,并利用类别标签技术对该算法进行有效改进.实验证明该算法不仅在效果上优于一般聚类算法,对结果描述也有很大帮助,在效率上也得到很大提高.     

基于K-近邻算法的Deep Web数据源的自动分类

针对Deep Web的查询需求,提出了一种基于K-近邻算法的Deep Web数据源的自动分类方法。该算法在对Deep Web网页进行表单特征提取及规范化的基础上,基于距离对Deep Web网页所属的目标主题进行判定。实验结果表明:基于K-近邻分类算法可以较有效地进行DeepWeb数据源的自动分类,并得到较高的查全率和查准率。     

基于ART神经网络的FCM聚类多目标跟踪方法

为解决模糊C均值（FCM）算法依赖类中心的初始化而运行时间过长的问题,提出了一种改进方法：该算法首先利用自组织谐振理论（ART）神经网络算法自动聚类的优点,对数据集进行＂粗聚类＂得到与实际类中心近似的初始类中心及聚类数目,再利用FCM算法对＂粗聚类＂结果进行聚类并得到最终精确的聚类结果。通过实验表明,改进算法结合了两种算法分类的特长,具有比FCM算法更高的聚类效率和更好的聚类质量;同时,算法的跟踪精度及运算速度也得到大大提高。     

基于DBSACN聚类算法的XML文档聚类

为了满足对XML文档集合进行数据挖掘需求,本文提出了根据XML文档树的语义信息和结构信息来计算其结构相似度,通过结构相似度构造其结构相似度矩阵,在此基础上应用DBSCAN算法来对XML文档集合进行聚类.与其他聚类算法相比,其聚类的速度得到了很大的提高.     

基于本征间隙与正交特征向量的自动谱聚类

 针对经典谱聚类算法无法自动确定数据类个数的问题,本文提出了一种基于本征间隙与正交特征向量的自动谱聚类算法.该方法利用样本数据构建亲和度矩阵,然后进行谱分解得到相应的特征值和特征向量,对特征值从大至小依次排序,用本征间隙来刻画相邻特征值之间的差,通过第一个极大本征间隙出现的位置来自动确定类个数,最后以特征向量之间的夹角作为相似度和已获得的类个数相结合来实现数据分类.本文算法的正确性在人造数据库上得到了验证,并在UCI数据库上与k-means、FCM、 Jordan算法进行了分类准确性比较实验,结果表明本文方法比其他三种方法的分类准确率更高.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.