距离法求语言特征主成分

语言特征成分的数量决定了成分对语言特征的影响度.作者把影响度视作距离,建立了一个数学模型,通过距离判断来求取语言特征主成分.     

低层特征融合的图像检索算法设计

现阶段基于单一的特征提取算法已不能满足人们对图像查准率、查全率的要求。有效地整合图像的颜色、纹理、形状等特征,使得各特征优势互补,进而提高系统检索效率现已成为一个值得研究并深入的课题[1]。从颜色、纹理两方面的特征出发,研究并设计了一整套的方案,很好的解决了查准率、查全率等问题。     

Multi-class supervised classification of electrical borehole wall images using texture features

Electrical borehole wall images represent micro-resistivity measurements at the borehole wall. The lithology reconstruction is often based on visual interpretation done by geologists. This analysis is very time-consuming and subjective. Different geologists may interpret the data differently. In this work, linear discriminant analysis (LDA) in combination with texture features is used for an automated lithology reconstruction of ODP (Ocean Drilling Program) borehole 1203A drilled during Leg 197. Six rock groups are identified by their textural properties in resistivity data obtained by a Formation MircoScanner (FMS). Although discriminant analysis can be used for multi-class classification, non-optimal decision criteria for certain groups could emerge. For this reason, we use a combination of 2-class (binary) classifiers to increase the overall classification accuracy. The generalization ability of the combined classifiers is evaluated and optimized on a testing dataset where a classification rate of more than 80% for each of the six rock groups is achieved. The combined, trained classifiers are then applied on the whole dataset obtaining a statistical reconstruction of the logged formation. Compared to a single multi-class classifier the combined binary classifiers show better classification results for certain rock groups and more stable results in larger intervals of equal rock type.     

A deadlock-free routing algorithm for dynamically reconfigurable Networks-on-Chip

We address routing in Networks-On-Chip (NoC) architectures that use irregular mesh topologies with Long-Range Links (LRL). These topologies create difficult conditions for routing algorithms, as standard algorithms assume a static, regular link structure and exploit the uniformity of regular meshes to avoid deadlock and maintain routability. We present a novel routing algorithm that can cope with these irregular topologies and adapt to run-time LRL insertion and topology reconfiguration. Our approach to accommodate dynamic topology reconfiguration is to use a new technique that decomposes routing relations into two stages: the calculation of output ports on the current minimal path and the application of routing restrictions designed to prevent deadlock. In addition, we present a selection function that uses local topology data to adaptively select optimal paths.The routing algorithm is shown to be deadlock-free, after which an analysis of all possible routing decisions in the region of an LRL is carried out. We show that the routing algorithm minimises the cost of sub-optimally placed LRL and display the hop savings available. When applied to LRLs of less than seven hops, the overall traffic hop count and associated routing energy cost is reduced. In a simulated 8 × 8 network the total input buffer usage across the network was reduced by 6.5%.     

基于在线社会网络的网络协议增强机制研究

在线社会网络已得到广泛应用,综合利用在线社会网络的社会关系信息和拓扑特征可以明显增强各层网络协议功能、性能和安全特性而使其成为新的研究热点。主要研究基于在线社会网络的网络协议增强机制,在分析现有增强机制特点的基础上,对它们进行了分类。然后,深入分析了各类增强机制的关键技术,总结相关研究存在的不足,最后提出一种集成社会感知平面的网络协议增强模型。     

Fuzzy ARTMAP classification of invariant features derived using angle of rotation from a neural network

Conventional regular moment functions have been proposed as pattern sensitive features in image classification and recognition applications. But conventional regular moments are only invariant to translation, rotation and equal scaling. It is shown that the conventional regular moment invariants remain no longer invariant when the image is scaled unequally in the x- and y-axis directions. We address this problem by presenting a technique to make the regular moment functions invariant to unequal scaling. However, the technique produces a set of features that are only invariant to translation, unequal/equal scaling and reflection. They are not invariant to rotation. To make them invariant to rotation, moments are calculated with respect to the principal axis of the image. To perform this, the exact angle of rotation must be known. But the method of using the second-order moments to determine this angle will also be inclusive of an undesired tilt angle. Therefore, in order to correctly determine the amount of rotation, the tilt angle which differs for different scaling factors in the x- and y-axis directions for the particular image must be obtained. In order to solve this problem, a neural network using the back-propagation learning algorithm is trained to estimate the tilt angle of the image and from this the amount of rotation for the image can be determined. Next, the new moments are derived and a Fuzzy ARTMAP network is used to classify these images into their respective classes. Sets of experiments involving images rotated and scaled unequally in the x- and y-axis directions are carried out to demonstrate the validity of the proposed technique.     

连续属性离散化算法SHD及其改进

为了让规则抽取算法能更好地适用于连续属性领域的问题,文章提出了一种有导师的连续属性离散化算法ＳＨＤ,并将该算法扩展到多连续属性处理领域。在此基础上,文章对该算法的数据预处理过程进行了探讨,提出了一种基于类间离散度矩阵分析属性空间重构造算法,并将其应用到属性预处理过程中。算法测试证明,对于连续属性领域的问题,使用ＳＨＤ属性离散化算法将明显改进后继规则抽取算法的效果。     

网络拓扑结构的数学模型及遗传算法

提出了网络拓扑结构的定义。 以ATM网络问题为例建立了优化问题的数学模型,并描述了用遗传算法并行求解该问题的方法。该方法较圆满地解决了既考虑经济效益又考虑需求的ATM网络问题。该问题的研究对实际应用及推动动态网络的研究有十分重要的意义。     

基于指纹识别技术的考试系统扩展设计与构想

在现行的考试系统中,如何准确的确定考生的身份,而防止代考现象的出现,是长期困扰教育系统的一个问题。在以往的系统中,主要采用防伪性能更好的准考证,采用学生证或者身份证与准考证结合的办法。但是,证件上的照片往往与实际的人员相貌有出入。因此,这种办法并不能解决代考现象的出现。针对考生识别工作中存在的问题,本文介绍了基于指纹识别技术的考试系统的构想与设计过程。     

Analytical benchmarks for topological optimization IV: square-shaped line support

Michell’s problem of optimizing truss topology for stress or compliance constraints under a single load condition is solved analytically for plane trusses having a square-shaped line support. Geometrical characteristics of the Hencky nets giving the truss layout are expressed in terms of Lommel functions. Analytically derived truss volumes for the above problem are compared with those of trusses supported along circles of equivalent area. Some general implications of the results are also discussed.