舰载武器系统局部故障分析方法与研究

针对舰载电子与武器装备结构复杂、设备数量庞大、分布舱室多、检测点分散不集中等问题,在充分调研论证基础上,以系统局部故障分析研究为切入点,提出适用于舰船武器装备特点的局部故障的分析方法;对系统的局部故障我们采用故障树的方法进行界定,并通过核心路径跟踪技术来确定检测点;采用核心路径在线故障检测方法,有效地节省测试资源,提高测试效率。     

基于FPGA的宽带数据采集时钟相位校正方法

为了解决宽带数据采集中由于传输线延时不一致造成的数据误采集的问题,首先从数据传输线电平转换机理入手分析了这一问题的原因所在,在此基础上,给出了估算采集时钟相位失真程度的一种简便测试方法,并分析了基于FPGA实现的两种时钟相位校正方法,即DPLL法和Logic Cell法;最后,利用FPGA集成开发环境QuartusⅡ对这两种相位校正方法的性能进行了仿真和比较,结果表明,这两种方法都具有精确的可控性。     

GLSV: Graphics library stereo vision for OpenGL

This work proposes the development of an auxiliary library for use with OpenGL, to facilitate the creation of graphic applications incorporating stereoscopic representation. This library, christened graphics library stereo vision (GLSV), is designed to remove all calculations involving knowledge of stereo vision theory from the task performed by the programmer without the latter having to change the way he/she has been working with the OpenGL library. The GLSV is distributed under the terms of the GNU Library General Public License agreement.     

Social Propagation: Boosting Social Annotations for Web Mining

This paper is concerned with the problem of boosting social annotations using propagation, which is also called social propagation. In particular, we focus on propagating social annotations of web pages (e.g., annotations in Del.icio.us). Social annotations are novel resources and valuable in many web applications, including web search and browsing. Although they are developing fast, social annotations of web pages cover only a small proportion (<0.1%) of the World Wide Web. To alleviate the low coverage of annotations, a general propagation model based on Random Surfer is proposed. Specifically, four steps are included, namely basic propagation, multiple-annotation propagation, multiple-link-type propagation, and constraint-guided propagation. The model is evaluated on a dataset of 40,422 web pages randomly sampled from 100 most popular English sites and ten famous academic sites. Each page’s annotations are obtained by querying the history interface of Del.icio.us. Experimental results show that the proposed model is very effective in increasing the coverage of annotations while still preserving novel properties of social annotations. Applications of propagated annotations on web search and classification further verify the effectiveness of the model.     

一种时频域联合捕捉主动声纳信号的方法

介绍了一种可应用于被动声纳的时频域联合捕捉主动声纳信号的方法及其工作流程。仿真相同噪声环境下使用该方法的发现距离与主动声纳探测距离,仿真结果表明使用该方法的发现距离远超过主动声纳探测距离,使用该方法可实现对目标的远程发现。     

一种RBAC改进模型及其在军事Web信息系统中的应用

军事Web信息系统要求用户权限必须严格控制、统一管理、维护简便.基于RBAC的访问控制模型能有效弥补DAC和MAC的不足.针对著名的RBAC96模型的缺陷,提出数据资源以业务功能表示、预设角色与用户临时权限的改进角色权限控制模型.该改进方法已经在某军事Web信息系统中得到了应用.     

基于Web2.0的《网络技术与实践》课程网站的设计与实现

随着计算机网络的发展,网页上的交互性大大增强,本文基于ASP.NET2.0设计实现了<网络技术与实践>的网络课程网站,培养了学生的自主学习能力和创新精神,加强了师生互动.其中的在线实验室24小时开放,学生在校园内随时随地在校园任何一个地方都可以通过校园网络登录在线实验室,进行组网技术的学习.     

基于核Fisher的理想投影空间及分类阈值确定

介绍了一种基于Fisher线性判别的非线性分类方法--核Fisher,其主要思想是首先把样本映射到特征空间F,然后在此空问进行Fisher线性判别,隐含地实现了原输入空间的非线性判别;同时利用SVM对分类阚值进行估计,实现了对两类样本最大程度的区分.通过仿真可以得出这一判别方式有利于确定两类平均丢包率的区分阚值.     

Substrate-mode holographic polarization-division multi/demultiplexer for optical communications

Based on the diffractive properties of a transmission-type phase volume hologram, a new type of polarization-division multi/demultiplexer for optical communications is presented.     

Effect of the modulation transfer function of a digital image-acquisition device on phase-measuring profilometry

Systematic errors in phase-measuring profilometry that are introduced by the modulation transfer function of a digital image-acquisition device are analyzed. New phase expressions and phase-deviation formulas are given. The results for simulations and experiments demonstrate that the algorithm of phase-measuring profilometry cannot be regarded as a point-to-point operation. To obtain precise results, an optimum scheme for setting the measurement system is also proposed.