Audio steganalysis based on ＂negative resonance phenomenon＂ caused by steganographic tools

INTRODUCTION With the rapid progress in the Internet and ex- panded area of multimedia technology, steganogra- phy and steganalysis as subfields of information se- curity have developed rapidly and drawn more and more attention. Steganography is the art of hiding and transmitting data through apparently innocuous car- riers in an effort to conceal the existence of the secret data (Peticolas et al., 1999). While steganalysis, the countermeasure to steganography, is an art that de- tects ev…     

Illustrator10中Web图形的输出

随着Internet的普及，Web页面的艺术设计也越来越重要，使用Illstlator不仅可以设计出专业化的页面，而且可以直接输出为Web文件，在Illustrator10中新增加的网页图片切割工具，在无损图像质量的前提下，可以把图形分解成相互拼接的块，从而缩小图片的大小，加快网页上图片的显示速度．在网页中，最引人入胜的是丰富的超级链接，通过点击网页上的超级链接到达网上的任何地方，获得无穷的网络资源．Illustrator10可以方便地在创作的插图中制作超级链接，并在输出的网页文件或FLASH动画文件中保持超级链接.     

Nonlinear decoupling controller design based on least squares support vector regression

INTRODUCTION Most practical systems are multivariate nonlin- ear systems. In general, the MIMO (multiple inputs and multiple outputs) systems are coupled. This cou- pling affects the effectiveness of a specific loop con- troller on the corresponding output, and in some case, may become serious and cause many difficulties to the control system design. How to decouple the mul- tivariate systems and design practical controllers is one of the major issues in nonlinear control area. In recen…     

结合扫描技术拓展AutoCAD在桥梁标准图中的应用研究

以扫描仪作为输入工具,将桥梁标准图扫描读入计算机,经矢量化处理后,转换为ＡｕｔｏＣＡＤ矢量图形文件,供设计、绘图使用。     

模糊向量空间及Fuzzy数项级数

本文利用三参数上半连续端点函数表示模糊数,提出一种特殊的度量,在这种度量意义下,讨论Fuzzy数项级数的收敛性问题。     

基于P（x）-Laplace流的向量值图像恢复模型

提出一种基于变指数型扩散方程的向量值图像（例如RGB图像或多谱图像）恢复模型。在新的模型中,我们利用光滑后向量值图像的几何流形特征来判断图像的真假边缘,利用P（x）-Laplace型扩散系数来控制扩散量和扩散方向。由于扩散系数具有良好的自适应判断边缘能力,新的模型在图像恢复的同时良好地保持了图像边缘。通过数值实验,对比以往的全变差模型,所提模型具有更好的图像恢复效果,明显减少了＂块状＂效应。     

基于MRAS磁链观测、转速估计的无速度传感器异步电机矢量控制系统

针对传统矢量控制系统磁链观测不准,且需要速度传感器的问题,提出了一种基于MRAS磁链观测、转速估计的无速度传感器异步电机矢量控制系统。介绍了磁链观测、转速估计的MRAS结构,并运用Popov超稳定理论推导出了其对应自适应律,建立了实验系统。实验结果表明,该矢量控制系统在启动、调速、稳态运行时具有良好的静、动态性能,是一种高性能的交流调速系统。     

关于n维欧氏空间上的广义勾股定理

以向量代数为工具,将三维欧氏空间上的勾股定理在n维欧氏空间上进行了推广,得到了广义勾股定理．     

自反Banach空间中多目标博弈平衡点存在性

在自反Banach空间给出了较弱条件下的多目标博弈平衡点存在性定理．     

Finite particle method for kinematically indeterminate bar assemblies

This study presents a structural analysis algorithm called the finite particle method （FPM） for kinematically indeterminate bar assemblies. Different from the traditional analysis method, FPM is based on the combination of the vector mechanics and numerical calculations. It models the analyzed domain composed of finite particles. Newton＇s second law is adopted to describe the motions of all particles. A convected material flame and explicit time integration for the solution procedure is also adopted in this method. By using the FPM, there is no need to solve any nonlinear equations, to calculate the stiffness matrix or equilibrium matrix, which is very helpful in the analysis of kinematically indeterminate structures. The basic formulations for the space bar are derived, following its solution procedures for bar assemblies. Three numerical examples are analyzed using the FPM. Results obtained from both the straight pretension cable and the suspension cable assembly show that the FPM can produce a more accurate analysis result. The motion simulation of the four-bar space assembly demonstrates the capability of this method in the analysis ofkinematically indeterminate structures.