使用EEG分析水平视差对3D图像舒适性的影响

水平视差是影响3D 图像舒适性的重要因素之一。采用不同等级水平视差的3D 图像作为刺激信号,通过记录被试者的EEG 反应信号,提取出被试者观看不同等级水平视差3D 图像的ERP 波形;同时记录被试观看这一系列3D 图像舒适性体验的行为数据,并计算其舒适性检测率。通过EEG信号分析可见,无论在交叉或者非交叉水平视差情况下,3D 图像水平视差舒适范围在45'以内;水平视差在45'~75'时,交叉视差3D 图像ERP 波形280 ms 附近的幅值与不舒适的程度相关,非交叉视差3D 图像ERP 波形250 ms 附近的幅值与不舒适程度相关;检测率曲线结果和主观评价结果显示:3D图像水平视差的舒适性范围在45'以内,水平视差在45'~75'时,3D 图像不舒适程度随着视差的增加而增大。结果表明:EEG 分析、检测率曲线和主观评价结论一致,因此,可以使用EEG 分析水平视差对3D 图像舒适性的影响。     

分簇无线传感器网络基于随机数的两级身份认证

文中提出一种分簇无线传感器网络的基于随机数的两级身份认证方法。该方案将认证过程分为两个阶段：簇头与基站的一级认证和成员节点与基站的二级认证。整个认证过程采用对称加密的方法,通过检查随机数的一致性来保证认证过程的连贯,对存储开销的要求较低。簇头作为中转节点,在全网中具有重要作用。在保证簇头安全的前提下成员节点才与基站开始认证,这样能有效地避免成员节点与基站在簇头不安全的情况下进行身份认证而带来的时间上和能量上的浪费,提高了认证效率,同时与传统的点到点的认证相比,能量消耗相对较少。     

Convolutional neural network based deep conditional random fields for stereo matching

Stereo matching has been studied for many years and is still a challenge problem. The Markov Random Fields (MRF) model and the Conditional Random Fields (CRF) model based methods have achieved good performance recently. Based on these pioneer works, a deep conditional random fields based stereo matching algorithm is proposed in this paper, which draws a connection between the Convolutional Neural Network (CNN) and CRF. The object knowledge is used as a soft constraint, which can effectively improve the depth estimation accuracy. Moreover, we proposed a CNN potential function that learns the potentials of CRF in a CNN framework. The inference of the CRF model is formulated as a Recurrent Neural Network (RNN). A variety of experiments have been conducted on KITTI and Middlebury benchmark. The results show that the proposed algorithm can produce state-of-the-art results and outperform other MRF-based or CRF-based methods.     

Effects of Ad Hoc MAC Layer Medium Access Mechanisms under TCP

Mobile computing is the way of the future, as evident by such initiatives as Bluetooth, Iceberg and HomeRF. However, for mobile computing to be successful, an obvious layer, the MAC layer, must be efficient in channel access and reservation. Therefore, in-depth understanding is needed of the wireless MAC layer if wireless computing is to takeoff. Many random access wireless MAC protocols have been proposed and even standardized. However, there has yet been an attempt to understand why certain designs are used and what makes certain protocols better than others. In this paper, we survey several popular, contemporary, wireless, random access MAC protocols and determine the effects behind the design choices of these protocols.     

新型舰炮系统时序化与随机性调度复合供弹方法

针对兼容发射的大口径舰炮弹种单一、射速低、更换弹种速度慢、持续作战能力差的突出问题,提出了时序化设计与随机性调度相结合的系统设计方法.依据该方法建立了系统机构的时间分配模型和系统多工作步时序机构的随机调度模型(制式弹平均供弹速率50发/min),并基于全系统工作时序和弹库系统Markov状态转移矩阵,对弹库系统机构进行...     

输入物面上的位相型元件的用途及其制作

阐述与输入物面密贴的位相型光学元件;条形散斑屏,随机相移器和位相光栅在光学全息及信息处理中的重要应用。分析了三类元件在应用和制作 中的共性问题及各自特点;针对这类银盐板遇光后黑化失效的弊病提出了避免的方法与工艺之改进。     

边失效概率不同情况下网络全终端可靠度的近似计算

用可靠性多项式计算网络全终端可靠度是评估网络拓扑结构德定程度的重要依据,精确计算可靠性多项式是一个NP-hard问题.本文通过对基于产生孤立点的概率随机事件的定义,运用概率不等式变换,给出了点可靠、边以不同的概率相互独立失效时,网络全终端可靠度的上界表达式,在可靠度近似计算过程中避免了对网络边割集和路集的搜索.最后,在...     

Reversible Disorder in a Room Temperature Ferromagnet

Random magnetic fields, varying from site to site in a magnetic material, are a form of disorder that can determine the local architecture and stability of the magnetic state. In a ferromagnet, the application of an external magnetic field can amplify the effects of the internal random fields and, in principle, harden a magnetic domain, without changing temperature and only for as long as the external field is present. Here, the rare‐earth compound Nd₂Fe₁₄B, formed with a granular morphology of random‐packed, elongated grains, is an experimental realization of the Random Field Ising Model in a room temperature ferromagnet. The application of magnetic fields transverse to the easy axis tunes the coupling between the structural disorder and the magnetic pinning properties. This material both illuminates the intricacies of tunable disorder and serves as a guidepost along the way to developing increased‐density magnetic storage media.     

直升机攻击条件下装甲目标伪装效能评估模型研究

利用马尔可夫决策理论,分析坦克与直升机在采取有效伪装与未采取伪装两种情况下的对抗过程并建立效果评估模型,最后得出作战兑换比公式,使伪装效能评估有数量概念,为进一步研究伪装效能评估奠定基础.采用建立的模型,可以定量评价伪装在坦克与直升机对抗过程中的作用,也可以定量地评估其他类似条件下的伪装效能.     

高精度机器视觉对准测量系统设计

设计了用于半导体先进封装光刻设备中的高精度机器视觉对准测量系统,明确了机器视觉对准测量系统工作原理、设计指标及系统设计中需要考虑的关键技术点,同时给出了机器视觉对准测量系统关键零部件的设计,并给出了对准测量系统最终在整机上测得的性能数据。测试结果表明,所设计的机器视觉对准测量系统完全可以满足集成电路先进封装工艺需求。