改进的PPCT混合编码方案

目前软件水印技术还不是很成熟,尚存在很多的问题,CollBerg和Thomborson对软件水印做了分类,提出了基于数据结构的水印嵌入方法,但是PPCT的动态图编码的效率较低。结合基数[k]枚举编码方案和PPCT编码方案进行混合编码,使叶子节点的右指针可以指向所有节点,利用叶子节点进行编码,提高了数据的嵌入率,利用叶子节点的左指针进行校验,提高鲁棒性。     

基于防篡改的双重软件水印方案

针对软件水印抗攻击性差和编码数据率低的缺点,提出一种具有防篡改功能的双重软件水印方案.利用寄存器分配的隐蔽性构造改进颜色排列算法.结合基数k编码的高数据率及平面环路树编码的强抗攻击性,构造混合编码双循环链表平面环路树.水印嵌入后,通过校验和机制及高级加密标准代码加密,防止逆向工程等手段对软件水印的篡改.理论分析和实验数据表明,该方案有较高的隐蔽性、鲁棒性和数据率,实用性较强.     

一种改进的动态数据结构软件水印编码方案

在经典的K基数循环链表结构和PPCT结构水印编码方式的基础上,提出了一种新的动态数据结构软件水印编码方案。理论和实验证明,该方案中采用改进的PPCT水印编码结构在多种评价指标上都具有一定的优势,是一个优良的动态软件水印编码方案。     

基于PPCT混合编码的防篡改水印方案

简单介绍了动态图水印的特征,概括了典型的PPCT的编码特征和纠错属性,分析了分别将PPCT与排列图和k-基数相结合的编码方案,提出一种改进的PPCT防篡改水印方案。该方案在不改变PPCT结构的前提下,引入基数编码提高了水印的数据率;利用防篡改技术弥补了PPCT纠错属性的局限性,实现了水印的双重防篡改功能;采用水印的冗余嵌入实现了水印的容错提取,增强了水印的鲁棒性。     

一种带纠错编码的小波零树基图像水印算法

提出了一种新颖的数字水印纠错编码方案。通过对二值水印图像进行精心设计，引入纠错编码机制，并将其应用于传统的小波零树(EZW)算法中。实验结果表明，在相同的水印嵌入强度和攻击强度条件下，通过引入纠错编码机制，可以显著提高水印在抗JEPG压缩、抗几何攻击、抗中值滤波、抗噪声干扰等方面的鲁棒性。     

一种稳健的盲水印算法

本文基于[2]中的最优盲水印检测方案,从编码的角度显著改进了水印的稳健性。我们考察了使用不同编码方案嵌入的水印的抗攻击性能,得出了合适的编码方案会显著提高水印稳健性的结论,最后通过实验比较了使用不同编码方案嵌入时,经过几种常见的水印攻击后,水印图像的稳健性,证实了按01或10顺序交错的编码嵌入方案不但简便易行,而且在提高水印的综合抗攻击性能上表现最好。     

改进的动态图水印技术编码方案*

针对动态图水印性能评测指标之间相互制约的关系,寻找指标之间的平衡点,满足理想水印图的特征条件,结合现有的动态图水印技术编码方案,改进了一种编码方案。该改进方案利用二维PPCT编码纠错能力强、抗攻击性能好的特点以及K基数链表编码率高的优点,引入混合编码的思想,添加指针域,构造多个水印图,对真实水印起到混淆的作用。理论分析和实验结果表明,该改进方案提高了数据率、抗攻击能力和鲁棒性,是一种不错的水印编码方案。     

基于变量防篡改的动态图软件水印方案

为了提高动态图软件水印的隐藏容量和鲁棒性,本文提出了一种基于变量防篡改的动态图软件水印方案。该方案利用不同进制形式的数可以相互转化的思想将大的水印信息分割成多个小的水印信息,然后将这些小的水印信息编码成一组图结构,动态地嵌入目标程序中。在编码水印信息时,利用动态图结构中结点的父指针来编码,并使其叶结点与目标程序变量关联,起到防篡改的作用,从而可对水印进行有效的保护。实验结果表明,嵌入水印信息后,目标程序的运行速度和结果都没有明显的变化,但水印对溢出攻击、扭曲攻击和附加攻击等都有明显的抵抗效果,水印也能够准确、方便地被提取出来。该方案的性能明显优于PPCT算法和常量防篡改水印算法。     

大容量数字水印编码方案比较研究

目前很多数字水印编码主要是针对灰色图像而言的,对于彩色图像数字水印编码目前还没有获得广泛应用,且所嵌入的水印容量较小。在本研究中针对大容量沟通到水印编码方案进行比较分析,这种使用编码方式主要是以彩色图像作为载体,通过采用水印压缩编码的形式,能够对图像颜色空间进行转换,并借助彩色分量转换方式,综合人体视觉感官系统确定最终的水印嵌入位置,将二维图像嵌入到载体中并能够显著提升水印图像的嵌入量,通过研究发现利用这种使用编码方案能够进一步扩大水印嵌入容量,同时对于剪切、图片压缩等环节健壮性较好。     

基于变进制规则的方程式软件水印算法

针对方程式重排序算法信息隐藏量低、水印嵌入和提取过程复杂的缺点,提出了一种基于变进制规则的方程式重排序软件水印算法。算法以程序中可安全交换方程式的初始系数序列作为密钥向量,无须借助远程认证中心,利用变进制转换规则和方程式系数循环右移操作实现了水印的嵌入和提取。实验分析表明,算法进一步提高了水印的数据率,增强了水印的隐蔽性,对BLOAT等扭曲攻击具有很强的抵抗能力。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。