A generalized EMD with body prior for pedestrian identification

In this paper, we present a generalized Earth Mover’s Distance (EMD) for pedestrian identification with body prior. (i) The general configuration of body is a valuable cue for human identification. A model of body prior about the general configuration is pursued to describe body prior for every pedestrian. In addition, the spatial incompatibility is computed by Kullback–Leibler divergence according to the pursued model and embedded into the ground distance of EMD. (ii) Furthermore, we generalize EMD by assigning different weights to regions of body, which are learned based on maximum margin criterion to boost discriminative power for pedestrian identification. The experimental results show that the generalized EMD and body prior substantially improve performance on pedestrian identification and the proposed approach is comparable to the state-of-the-art performance.     

银纳米立方体对诺丹明分子的荧光增强或猝灭效应实验研究

用乙二醇还原硝酸银,成功制备了平均边长约97 nm的银纳米立方体以用于诺丹明(RhB)分子的荧光实验。实验中,将探针分子 RhB 粉末掺杂于PMMA苯甲醚溶液中,制得不同厚度参杂有RhB探针分子的PMMA薄膜,运用光谱技术和共焦显微技术研究了银纳米立方体与荧光分子的间隔、银纳米立方体不同浓度分布对RhB分子的荧光强度的影响。荧光光谱表明,荧光强度随PMMA厚度变薄而增强,当PMMA厚度为10nm时,荧光增强因子最大,获得了56倍的荧光增强效果,而继续减小PMMA厚度时,其荧光增强因子又变小,说明发生了荧光猝灭效应。共焦荧光像则更直观地表现了银纳米立方体的浓度分布对荧光分子辐射增强的影响。因而,可通过调控银纳米立方体与荧光分子的距离及银纳米立方体的分布优化荧光增强因子以用于基于荧光的单分子探测,这一实验结果在生物成像和生物传感领域有潜在应用价值。     

基于随机实验的蠕虫传播预测研究

蠕虫传播预测是蠕虫防御的基础之一，但随着蠕虫扫描策略日趋多样和互联网结构逐步复杂，在蠕虫爆发初期及时建立精确的蠕虫传播模型变得越来越困难。利用随机仿真实验来模拟蠕虫在网络中的传播行为，通过统计分析仿真实验结果，发现蠕虫传播实验结果是一个随机过程，而实验结果间存在很高的线性相关性。由此提出一种基于仿真实验统计结果的蠕虫传播趋势预测方法，该方法可以利用0．1％存在漏洞主机的感染信息精确的预测蠕虫传播趋势。     

MATLAB在TFT-LCD屏显示MURA缺陷检测的应用

提出一种以MATLAB为主要工具的TFT-LCD屏显示缺陷检测方案,该方案根据CMOS工业摄像机采集到的数字图像,结合二维图像拟合技术和以韦伯定律为原理的自动阈值获取技术,使用MATLAB作为数字图像分析工具实现对屏幕缺陷的检测。介绍了该方案的硬件组成和检测原理,给出了MATLAB算法流程和部分代码、介绍了GUI检测界面的设计和详细的检测步骤及结果,为TFT-LCD液晶屏显示缺陷的检测提供了一种快速有效的方法。     

EPON加密方案的实现

安全问题是以太无源光网络(Ethernet Passive Optical Network--EPON)亟待解决关键技术问题之一.文章根据802.3 EFM工作组对于EPON网络的相关建议和802.3ah协议,分析了EPON网络中存在的安全隐患,针对EPON网络中存在的广播窃听和内容重放攻击两个方面的安全问题,提出了一个抗广播窃听和重放攻击的混合加密方案,该方案通过加密密钥交换和加密MAC帧两条途径,有效地增强了EPON网络的安全性.最后,在Altera QuartusII 4.1上对本方案的加解密算法进行了仿真实现.     

Structural and electrical properties of the Ge x Si1−x /Si heterojunctions obtained by the method of direct bonding

The results of studying the structural and electrical properties of structures produced by the method of direct bonding of Ge _x Si_1?x and Si wafers are reported. The wafers were cut from the crystals grown by the Czochralski method. Continuity of the interface and the crystal-lattice defects were studied by X-ray methods using synchrotron radiation and by scanning electron microscopy. Measurements of the forward and reverse current-voltage characteristics of the p-Ge _x Si_1?x /n-Si diodes made it possible to assess the effect of the crystallattice defects on the electrical properties of heterojunctions. Satisfactory electrical parameters suggest that the technology of direct bonding is promising for the fabrication of large-area Ge _x Si_1?x /Si heterojunctions.     

TD-SCDMA中Turbo编码算法在ZSP500 DSP核上的实现

文章对TD-SCDMA系统中的Turbo编码器结构及编码算法进行了分析，给出了TD-SCDMA系统中Turbo算法在ZSP500 DSP核上的实现，并根据ZSP500 DSP核的特点对实现部分的进行了阐述。     

智能手机软件平台的研究与开发

文中研究了智能手机软件平台的基本功能，给出了智能手机的软件体系结构。结合手机和掌上电脑的特点，在PALM OS 6.1嵌入式操作系统平台上，基于手机通信模块进行整机周边电路设计和智能手机软件平台开发。     

Recent Progress of Bismuth Effect on All-Inorganic Lead-Free Metal Halide Derivatives: Crystals Structure,Luminescence Properties,and Applications

Bismuth (Bi³⁺)-included lead-free metal halide (LFMH) materials attract much attention in lighting, display, photodetectors, X-ray detectors, and photovoltaic fields, due to the tunable luminescence and optoelectronic performance in response to crystal and electronic structure, morphology, and particle sizes. This review summarizes Bi³⁺-included LFMH materials about their preparation approach, crystal and electronic structure properties, luminescence performance, and emerging applications. Notably, Bi³⁺ ions not only can act as framework cation to construct stable LFMH structure, but can also incorporate into LFMH materials as activators or sensitizers to generate remarkable luminescence tuning and band engineering. The Bi³⁺ effect on the luminescence and optoelectronic properties of LFMH materials, including, promotion of exciton localization, enhancement of light absorption in near-ultraviolet region, action as sensitizer ions to transfer energy to rare earth or transition metal ions and emission of highly-efficient light is systematically summarized. The proposed structure-luminescence relationship offers guidance for the optimization of current Bi³⁺-included LFMH materials and the exploitation of new LFMH derivatives.