基于噪声模型的DCT域盲水印算法

针对DCT交流系数分布函数的广义高斯分布模型设计了一个盲水印算法,该算法独立于具体图像,具有通用性.实验结果显示,该算法表现出良好的检测性能和对包括JPEG压缩、裁剪、高斯噪声、虚假嵌入在内的多种攻击的鲁棒性;进而,将此算法推广到多重水印嵌入场合,提出了三种重复嵌入策略,增加了嵌入的信息量和嵌入方式的灵活性.     

光电式指纹采集图像装置及其分类算法

介绍了基于CMOS图像传感器的便携式指纹采集装置的设计,利用全反射原理,并通过对指纹图像全局的方向分布获取特征向量.实验证明,特征向量融合方法使分类的准确率达到93.7%.     

3ComHFC数据网络解决方案(下)

介绍了3Com公司的HFC有线电视网络的总体架构,数据传输的解决方案。     

基于通用硬件的数字脉冲压缩工程实现研究

现代脉冲体制雷达大部分采用脉冲压缩技术解决距离分辨率与平均功率的矛盾,其工程实现正逐渐由定制硬件向通用硬件发展。文中阐述了数字脉冲压缩技术的基本原理,并给出了基于通用硬件的一种数字脉冲压缩工程实现方法,同时介绍了硬件资源及主要芯片的工作软件流程图,且比较了理论仿真结果和实际工程运算结果,证实了所述工程设计方法的有效性。     

Physical-layer network coding in k-users MIMO-Y two-way relay channels

In order to exchange information among k users using the technology of physical-layer network coding in the multiple input multiple output Y two-way relay channels,the GSA-GSA scheme was proposed,using the technology of general signal alignment during the uplink and the downlink.The signals were exchanged between every source node align in a transformed subspace,rather than the direct subspace.This was realized by jointly designing the precoding matrices at all source nodes and the processing matrix at the relay.The constraints of the number of sending and receiving antennas and the sum rate of proposed scheme were analyzed.In simulation,it can figure out that the proposed scheme needs fewer antennas in the whole system and can improve the achievable system sum rate under the same SNR and degrees of freedom.     

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.     

浅谈珠江电厂烟气脱硫改造工程中的总图设计

珠江电厂1, 2 号机组烟气脱硫采用石灰石- 石膏湿法烟气脱硫工艺。由于建电厂时未预留烟气脱硫装置的位置, 老厂脱硫改造工程总图设计时, 考虑了总平面、竖向、管线、道路、绿化等多方面的布置, 消除老厂脱硫改造过程中遇到场地限制、建设条件复杂等各种因素的影响。在设计施工图阶段, 制定了处理具体问题的方法, 使老厂脱硫改造工程得以顺利进行。     

半潜式生产平台上部模块总体布置研究

针对半潜式生产平台的特点,对平台上部模块的总体布置进行深入研究。分析影响上部模块总体布置的关键因素,总结上部模块总体布置的原则和方法。为今后开展南海半潜式生产平台设计与开发提供参考。     

防空导弹作战环境的动态红外景像生成

通过分析红外图像的特点和天空背景中各景物的红外辐射规律及其相互关系,提出和完成了防空导弹作战环境的动态红外背景图像的合成及其实时模拟显示方法,并对得到的结果及其特点进行了比较分析.     

从数字看发展片式电容器面临的机遇与挑战

采用海关进、出口统计和行业生产统计资料,通过计算、分析,用数字来说明国内发展片式多层陶瓷电容器、片式钽电解电容器、片式铝电解电容器、片式有机薄膜电容器所面临的机遇与挑战,并对其国内市场需求总量、额,国产品在国内市场占有率等做出评估,为有关单位了解片式电容器的发展提供参考,为国产产品更有效地进入国内市场、促进其发展提供依据。