分水岭算法和基于MRF的层次聚类相结合的混合无监督图像分割算法

提出一种新的混合多阶段无监督图像分割算法。在第一阶段，通过分水岭算法得到一幅过度分割的图像，该图像中的所有小区域作为初始聚类状态将在接下来的层次聚类阶段中被合并。在第二阶段，一种新的启发式的基于Bayesian方法和Markov随机域的计算模型被用于基于区域的层次聚类算法，该算法用来合并初始分割结果中的邻接区域，以改进分水岭算法的分割效果。深入分析了该计算模型中两个相互作用的部分。通过对多种不同种类图像使用该算法进行分割，表明这种多阶段的方法适合无监督分割，它按照视觉一致的方式合并区域，并且比传统的层次聚类算法快很多。     

用三重DES加密.NET数据库连接字符串

南航网上售票系统基于微软的.NET技术,数据库连接信息存放在Web.config配置文件中.通过使用3DES算法对数据库连接字符串进行加密,增强系统的安全性.首先分析.NET Framework提供的密码类,然后设计了具体的3DES的应用类.管理员设置数据库连接信息,并用3DES加密后,放置于Web.config配置文件中.应用程序从Web.config中取出连接字符串,解密后,用其创建ADO.NET数据库连接.     

使用XML快速生成常见类型文档设计与实现

本文分析了传统生成文档方式的问题,结合当前一些常见类型文档支持XML格式．提出将数据集的数据转换成这些常见类型的文档支持的特定XML字符串,通过文件流的形式直接快速生成文档．这种过程就是通过XML文档直接生成常见类型的文档。     

Basis factorization method for multistage linear programming problems with an application to optimal energy plant operation

An algorithm based on the basis factorization method for solving multistage linear programming problems is presented. In applying linear programming for optimal dynamic-plant operation, the constraint appears in the form of a staircase structure. When pivotings occur within each stage, the inversion of the basis matrix is easily obtained using inversions of small square diagonal blocks. In general cases, pivotings across stages occur. However, this basis matrix can be easily transformed into the former square block triangular form using the correction factor. The correction factor means multiple pivotings among the bases and contains structural columns corresponding to different columns among these bases. When these structural columns are maintained in computer storage, the relative cost factor for general bases is easily obtained using a set of elementary column operations. A program code using the above idea is developed and applied to in-plant energy operating systems. A computational example shows that the computing time of the proposed algorithm is less than 10 percent of the general purpose LP code MPS-II.     

共享文件加密存储分级访问控制方案的实现

为解决传统文件共享方式单一、安全性不足以及共享文件权限控制自主性过高的问题,提出了一种文件加密存储分级访问控制方案,通过在系统中增加分级管理单元,实现对用户、文件的分级以及用户对文件访问权限的控制,实现文件的访问范围可控;通过文件的加密实现文件存储和传输的安全性;分级密钥的使用,简化了密钥的存储。服务器端文件的加解密操作通过专门的密码卡实现,减轻了服务器端的工作量,加速了文件的加解密处理。在基于PC和Zynq平台上进行了验证,实现了预定功能。     

图纸矢量化中多向字符的分割

本文描述了工程图中多向字符串的分割方法,提出一种新的高精度字串的迭代定向算法,有效地解决了倾斜短字串的方向纠正。同时对字线相交时的推理分割方法也作了介绍。研究中使用了图象形态分析的方法,直接在原图象上进行整体识别,保证了图象信息的完整性和可检测性。     

Incorporating String Search in a Hypertext System: User Interface and Signature File Design Issues

Hypertext systems provide an appealing mechanism for informally browsing databases by traversing selectable links. However, in many fact finding situations string search is an effective complement to browsing. This paper describes the application of the signature file method to achieve rapid and convenient string search in small personal computer hypertext environments. The method has been implemented in a prototype, as well as in a commercial product. Performance data for search times and storage space are presented from a commercial hypertext database. User interface issues are then discussed. Experience with the string search interface indicates that it was used successfully by novice users.     

分级特征提取在中子寿命深度校正中的应用

随着油田进入开发中后期,中子寿命测井得到了广泛的应用．针对中子寿命测井曲线存在的深度误差,对两条测量不同地层信息的曲线进行对比校正,利用测井陆线顺序性的特点,对测井曲线进行分级特征提取并进行校正,提出了基于分级特征提取的测井曲线校正的方法．借鉴人工视觉校正的经验,利用曲线段的最大值位置、尖峰数目这两个特征先对曲线段进行分类匹配,然后利用最大值上下厚度比、相对斜率这两个特征进行相似性判断最终实现分级特征提取．实验结果表明该方法能够快速有效的对测井曲线进行校正．     

A portable file directory system

A portable file directory system that provides a machine-independent method for specifying files is described. The portable directory system, or PDS, facilitates uniform usage of portable software by supplying a standard for file specification. The PDS supports a hierarchical directory structure, similar to that in UNIX and Multics, and a set of primitives for manipulating the structure and preparing files for input/output. While the PDS participates in file specification, it does not participate in the actual i/o; it has no impact on i/o efficiency. The implementation, which is easily extended to include additional capabilities, is described. Experience in using the PDS as a part of command interpreters and preprocessors is also discussed.     

High performance computing algorithms for land cover dynamics using remote sensing data

Global and regional land cover studies need to apply complex models on selected subsets of large volumes of multi-sensor and multi-temporal data sets that have been derived from raw instrument measurements using widely accepted pre-processing algorithms. The computational and storage requirements of most of these studies far exceed what is possible on a single workstation environment. We have been pursuing a new approach that couples scalable and open distributed heterogeneous hardware with the development of high performance software for processing, indexing and organizing remotely sensed data. Hierarchical data management tools are used to ingest raw data, create metadata and organize the archived data so as to automatically achieve computational load balancing among the available nodes and minimize input/output overheads. We illustrate our approach with four specific examples. The first is the development of the first fast operational scheme for the atmospheric correction of Landsat Thematic Mapper scenes, while the second example focuses on image segmentation using a novel hierarchical connected components algorithm. Retrieval of the global Bidirectional Reflectance Distribution Function in the red and near-infrared wavelengths using four years (1983 to 1986) of Pathfinder Advanced Very High Resolution Radiometer (AVHRR) Land data is the focus of our third example. The fourth example is the development of a hierarchical data organization scheme that allows on-demand processing and retrieval of regional and global AVHRR data sets. Our results show that substantial reductions in computational times can be achieved by the high performance computing technology.     

多功能AES加密与解密软件的设计与实现

文章将AES算法应用于对字符串与文件的加密与解密,并提出了＂加密包＂的概念。在对AES算法实现时,采用了预先计算查找表、密文挪用等技术,使该算法的运行更加快速且合理地解决了等处理数据长度不是数据块分组长度的整数倍这一特殊情形;在对文件读写的优化实现上采用了多线程、多缓冲区及内存映射文件三种技术相结合的方式,极大地提高了软件的文件读写效率。实验结果表明,该软件具有很高的运行效率且操作灵活便捷。     

基于粒子群算法的控制系统校正

针对控制系统校正参数求解过程繁琐的问题,提出一种基于粒子群算法的控制系统校正方法。为了提高系统的校正效率,本设计方案首先将多个超前校正装置和滞后校正装置串联组合成多级校正装置,然后采用粒子群算法程序直接对多级校正装置的参数进行寻优,找出满足性能指标要求的多级校正装置的参数,从而实现控制系统的校正。仿真结果表明,这种方法不但简化校正的过程,提高控制系统校正的效率,而且扩展了可校正系统的范围。     

MANET中P2P文件系统的设计与优化

设计了一个MANET环境下基于CBRP协议的优化的P2P文件系统,系统采用了基于簇的层次结构,论文对各种消息结构作出了定义,包括对簇结构及结点资源都做了详细的说明。论文提出了在MANET环境下一种新的P2P文件资源的定位方法,实验结果显示,MANET下采用CBRP协议对P2P文件系统优化后在减轻洪泛效应、减少网络负担方面具有很好的效果。     

Excel 2007文档信息隐藏方法

Excel 2007文档采用了一种新的默认文件格式,即Excel XML格式,这种新的格式为在Excel文档中隐藏信息提供了新的思路。结合Excel 2007的自身特点和XML规范,提出了一种基于无用属性的Excel 2007文档信息隐藏方法。该方法首先将待隐藏的信息加密后转换为十六进制的Unicode码,然后通过算法选择可用于隐藏信息的XML部件,并创建无用属性,最后将转换后的字符串作为无用属性的属性值写入,从而达到信息隐藏的目的。实验表明,该方法的容量较大,隐蔽性好,可用于隐秘通信。     

基于层级策略的连续数字串识别的研究

在分析汉语数字串语音特点的基础上,设计出了基于层级策略的连续数字串识别系统。该系统先对连续数字串进行确定性的预分割,再用LevelBuilding算法对每个分割段进行基于模板模糊分组的识别,在该识别结果的基础上利用加权矩阵识别算法进一步区分易混淆语音对。该系统在计算时间减少到原来的35.2%的同时识别率提高到94.08%。     

基于多维标识的文件分级保护模型

针对传统文件保护技术中普遍存在的分级管理差、管控粒度不细等问题,结合多维多密级的文件应用环境,提出基于多维标识的文件分级保护模型.该模型将静态特征标识和动态密级标识相结合,引入域标识的概念,并证明其安全性.经分析和应用表明,该模型能在不影响文件正常使用的基础上,使不同环境中的文件访问都能得到有效控制,从而保证文件的安全...     

Transition from national standards to Unicode: multilingual support in operating systems and programming languages

Character sets are one of the basic issues for information interchange. Most current national standard character sets extend 7‐bit ASCII. These extensions conflict with each other and make the design of multilingual information systems complicated. Unicode or the Universal Character Set (UCS) is a character set that covers symbols in the major written languages. Text files and strings usually have no header to indicate which character set is in use, and they currently use one of the national standards by default. The transition from national standards to Unicode may take a longer time than expected. This paper presents the following methods to help the transition. (1) A text file format of fixed‐width characters: if the first character in a text file is a nonzero control code, the file is in UCS; otherwise, it is in the default national standard. The control code indicates which UCS subset or byte order is in use. (2) A tagged string storage: each string has a tag representing which character set or coding format is in use, e.g., the default national standard, 8‐bit subset of UCS‐2, UCS‐2, or UCS‐4. (3) A method for assigning the format of string literals: all string literals use the same syntax notation, and their storage format is the same as that of their source files. These methods can improve multilingual support without introducing much complexity. Copyright © 2000 John Wiley & Sons, Ltd.     

面向海量层次信息可视化的嵌套圆鱼眼视图

针对海量层次信息可视化问题,提出嵌套圆鱼眼视图及实现方法.首先分析了相关工作;然后构造了针对同层兄弟节点的变形函数,给出了针对焦点节点同层兄弟节点的外切圆变形排列算法、变形后节点的子节点的嵌套圆递归排列算法及将二维鱼眼视图映射为三维鱼眼视图的方法;最后将该方法应用于计算机文件系统可视化.实验结果表明:该方法在相对小的显示空间内,既能显示海量信息的整体视图,又能突出局部焦点细节信息,具有较高的任务完成效率与用户满意度.     

基于内容和分层结构的XML文件自动分类方法

提出了一种以XML文件内在的分层结构为基础的文件分类方法，井与改良的VSM方击的实验结果进行了比较。和以往XML文件的分类方法不同的是．此方法更加注重XML文件特有的结构信息。首先利用TF-IDF方法针对XML文件非蛄构的信息产生一般特征集，然后再针对XML文件各个屡次重要性赋予一定的权重。从而产生层次特征集，然后根据一些领域知识，产生知识特征榘。将三个特征集结合起来对XML进行分类。试验结果表明，这种方法比改良的VSM方法在分类的准确性方面有大幅的提高。     

REVISED HIERARCHICAL ANALYSIS METHOD BASED ON CRISP AND FUZZY ENTRIES

Abstract

In this paper, I continue to study the alternative hierarchical analysis method that was initialed in [Saaty, 1976]. Instead of using pairwise ratio matrices, this method uses pairwise subtraction matrices. By doing so, computational complexity is reduced significantly, and as shown by a statistical experiment described in this paper, the two methods lead basically to the same results. Furthermore, this method provides an optimal solution in the sense of minimizing an appropriate error function. Due to the significant reduction in computational complexity, fuzzy hierarchical analysis based on pairwise subtraction matrices becomes more manageable. Finally, I point out a new application area of the hierarchical analysis: estimating crisp or fuzzy prior probability distributions for Bayesian inference with imprecise probabilities.