结合高效特征融合的可变尺寸图像隐写分析

为提升隐写分析的效率和准确率,并适应多尺寸输入图像,提出一个基于高效特征融合的可变尺寸图像隐写分析模型。在预处理层中,将经空域富模型的多阶高通滤波器初始化的多尺寸卷积核加入网络学习中,以提升模型的收敛效率和检测性能;在特征提取层中,采用特征融合思想,设计两个由Ghost瓶颈层、残差模块、密集连接模块组成的子网络,并融合输出的抽象隐写语义特征和非线性的高维隐写特征,以获得隐写特征的依赖性信息,增强模型的特征表达能力;采用改良版空间金字塔池化以自适应可变尺寸的图像样本,并丰富隐写特征的多样性。经仿真分析可知,模型能正确捕获关键的隐写信号,具备较高的收敛效率,在嵌入率为0.2、0.4的WOW隐写算法的检测准确率分别为82.6%和96.5%,在嵌入率为0.2、0.4的S-UNIWARD隐写算法的检测准确率分别为81.4%和95.2%,显著高于SRM和YedroudjNet隐写分析模型。     

The “nonideal” drain-loaded source-follower and accurate differential-amplifier analysis

This paper presents an elegant technique for the mid-band analysis of a “nonideal” drain-loaded source-follower. The analysis of the drain-loaded source-follower is then applied to the superposition-based mismatch differential-gain analysis of a differential amplifier. This novel technique provides a more comprehensive mismatch gain analysis of the differential amplifier compared to that available in text books and other published sources. The presented analysis of a “nonideal” drain-loaded source-follower has not been reported before in open literature in any form. This new method renders the need for the well-known and commonly employed “voltage-divider” form of the source-follower analysis unnecessary. A more accurate differential-amplifier mismatch gain expression is attained using a much simpler source-follower mid-band analysis technique.     

Kiowa Calendars and the Search for Sacred Power

This article explores Kiowa sai-gut, or calendars produced in the 1880s and 1890s to show how makers used material culture to represent new ritual practices as both broadly indigenous and particularly Kiowa. Using calendars as one form of Kiowa cultural expression, the article considers how Kiowas navigated their reservation’s changing religious landscape. Building on literature in American Indian studies that emphasizes native agency and activity in this period, the article suggests that scholars of American religions can look to forms of material culture as ways to track American Indian religious life in this period.     

用GHOST和Pro Magic快速恢复系统的比较

随着计算机应用的普及,越来越显现出系统维护工作的重要性。如何快速安全地恢复计算机系统,是计算机用户特别是机房管理者关心的问题。文章讨论了以Ghost和Pro Magic两种软件为工具的快速恢复计算机系统的方法。     

使用GHOST多点传输技术实现系统软件的快速恢复

介绍了利用Ghost软件实现计算机系统软件快速恢复的方法，并着重讨论了在局域网中通过TCP／IP协议进行网络克隆的技术。     

巧用Ghost克隆Windows 2000 Server系统分区

用Norton Ghost克隆Windows 98/Me系统盘或系统分区时可以做得很顺利，但在克隆Windows 2000 Server系统盘或系统分区时就会出现无法启动或无法登录的问题。本文介绍一种解决该问题的方案：先把系统分区备份为一个映像文件，以后再从映像文件恢复系统分区到另一个硬盘，这样克隆出来的系统硬盘就可以正常使用了。当然，也可以把映像文件恢复到原硬盘的系统分区，以恢复被损坏的系统。     

基于Ghost的计算机机房管理

网络机房经常面临系统升级、个别工作站系统崩溃、添加删除软件等,给机房管理员带来诸多不便,造成管理上的困难,通过实践,利用Ghost软件和局域网作为平台迅速修复故障,从而提高网络机房的管理效率。     

Evaluation of shear-induced particle diffusivity in red cell ghosts suspensions

The shear-induced particle diffusivity in the red blood cell suspensions was evaluated based on the flow model and experimental results in a rectangular flow chamber. The effective diffusivity (D_e) of solute in the particle suspensions is equal to the stationary diffusivity (D_s) of the solute plus the shear-induced particle diffusivity (D_p). The effective diffusivity (D_e) of bovine serum albumin (BSA) in the red blood cell (RBC) ghost suspensions was determined under diffusion-limited conditions using a total internal reflection fluorescence (TIRF) method as a function of suspended RBC ghost volume fractions (0.05-0.7) and shear rates (200-1,000 s,^-1). The stationary diffusivity (D_s) of BSA in RBC ghost suspensions was calculated by Meredith and Tobias model. Therefore the shear-induced particle diffusivity undergoing laminar shear flow can be evaluated. The shear-induced RBC ghost diffusivity was ranged from 0.35xl0^-7 to 21.2xl0^-7 cm²/s and it increased with increasing shear rate. Also the shear-induced RBC ghost diffusivity increased as a particle volume fraction increased as well, up to a particle volume fraction of 0.45. However, for RBC ghost volume fractions above 0.45, the shear-induced particle diffusivity decreased with increasing particle volume fraction. The shear-induced particle diffusivity in RBC ghost suspensions is a function of a particle Peclet number (or shear rate) and particle volume fractions. The dimensionless particle diffusivity (D^ρ/a²γ) was investigated as a function of particle volume fraction and these results are in good agreement with the literature values.     

从设计角度论“鬼城”的前世今生

由于盲目追求规模和速度，中国城市化进程中出现了数量众多的“鬼城”。从建筑、规划设计的角度看，“鬼城”的出现有其特定的历史原因，也造成了巨大的影响。本文从建筑设计从业者的角度出发，认为应通过一系列合理的建筑、规划设计，建设宜居之城，避免造成更多的“鬼城”。     

香港盂兰胜会的临时竹戏棚

香港农历七月系列临时竹戏棚的建造,涉及空间组织类型与变体,以及盂兰胜会的策划及活动安排;指出建筑、需求、场地以及精神层级极为紧凑、合理的关联是该类型的民间轻质结构自然美妙的原因.