基于H．323协议和帧中继网络的远程监控系统实现

目前H.323协议已成为视频技术的发展重点,帧中继接入方式具有多方面的优势.提出一种基于H.323协议族的H.263和G.729协议标准和帧中继接入方式的远程监控系统的实现方案,分析系统组成结构,并探讨了相关的关键技术.     

基于二重差分法的光流场运动检测

对视频图像序列中运动目标的检测,是计算机视觉领域长期关注的问题.传统的Horn-Schunck光流算法非常耗时,不利于在视频图像序列中做实时分析,故提出采用结合背景差分法与帧间差分法的二重差分法(DS)来做光流算法的预处理.实验结果也表明二重差分法的光流算法(DSOF)比单纯用Horn-Schunck方法计算光流效率更高,用时更短,能更好地满足对视频图像序列做实时运动检测分析的需求.     

基于贝叶斯网络的复杂装备D-S诊断

利用D-S证据理论进行故障诊断时,首先需要确定出故障识别框架和基本置信分配.但在导弹武器等复杂装备中,存在着故障原因与故障征兆之间关联关系不确定的现象,增加了求取故障识别框架和基本置信分配的困难.文中提出了利用贝叶斯网络理论来解决难题的方法,使D-S证据理论能在复杂装备故障诊断中得到应用.文中首先给出了诊断贝叶斯网络的适应度函数,并利用改进的粒子群优化算法求解了诊断贝叶斯网络.然后分析了诊断贝叶斯网络中故障原因与故障征兆间的关联关系,给出了征兆集合、异因征兆集合概念.提出了求解故障识别框架和基本置信分配的方法.最后,通过实例的D-S诊断,验证了所提方法的正确性.     

移动质心自旋再入飞行器的建模与解耦控制

对移动质心控制自旋再入飞行器进行了概念研究.以所建立的移动质心自旋再入飞行器的姿态动力学模型为基础,分析其控制耦合特性,借鉴工程中易于实现的逆奈奎斯特阵列法,对被控对象进行预补偿,使其传递函数矩阵成为具有对角优势来削弱被控对象各回路间的耦合,然后再运用单变量系统的频域设计方法对每个回路单独设计,从而将复杂的多变量设计问题转化为单变量设计问题,解决较强耦合下自旋再入飞行器姿态稳定性同题.仿真分析表明,对被控对象进行预补偿设计后,系统达到了较好的解耦效果.     

Partition oriented frame based fair scheduler

Proportionate fair schedulers provide an effective methodology for scheduling recurrent real-time tasks on multiprocessors. However, a drawback in these schedulers is that they ignore a task’s affinity towards the processor where it was executed last, causing frequent inter-processor task migrations which ultimately results in increased execution times. This paper presents Partition Oriented Frame Based Fair Scheduler (POFBFS), an efficient proportional fair scheduler for periodic firm and soft real-time tasks that ensures a bounded number of task migrations. Experimental results reveal that POFBFS can achieve 3 to 100 times reduction in the number of migrations suffered with respect to the General-ERfair algorithm (for a set of 25 to 100 tasks running on 2 to 8 processors) while simultaneously maintaining high fairness accuracy.     

一种用于帧频提升系统的运动估计算法

基于静止检测、运动矢量预测,结合局部全搜索和下采样方法,提出一种有效的运动估计算法。将该算法用于基于运动估计运动补偿的帧频提升系统中。实验结果表明,该算法在减少计算量的同时,保证了内插帧有较高的主客观质量,能减少搜索点数,同时保持较高的搜索准确度。     

政务信息资源中心框架设计及关键技术研究

目前国内有关政务信息资源共享的研究及应用还停留在网络互联互通、信息资源整合、点对点数据交换阶段,并没有达到"协同工作"的要求.鉴于此,提出了政务信息资源中心的概念,实现政务信息资源的统一获取、统一管理、规则化和规模化服务.结合工作实践,对其组成、总体框架、技术架构进行了设计,并就实现时需要解决的关键技术进行了研究.     

The input-interface of Webcam applied in 3D virtual reality systems

Our research explores a virtual reality application based on Web camera (Webcam) input-interface. The interface can replace with the mouse to control direction intention of a user by the method of frame difference. We divide a frame into nine grids from Webcam and make use of the background registration to compute the moving object. In order to make this technology apply to 3D virtual reality system, we use the Virtools Dev to build virtual scenes and the Microsoft Visual C++ to build this interface. We also use the MySQL database management system to access users’ data and the displaying data. We implement a number of Building Blocks (BB) to support Virtools Dev for using the database management system and the Webcam input-interface in this composite system. The results of research are expected to the digital content industries such that users can easy to use the input-interface to control browsing the virtual reality. Our system can supply interactive digital content, photographs, and access the questions from the database management system. In addition, the system provides the browsing mold, the question mold, and the course content describing mold with the input-interface. In order to explore the intention of users for using the system, we design the questionnaire based on the technology acceptance model (TAM). In our empirical study, we find that perceived playfulness is positive association with attitude toward using. Interface style is positive association with perceived ease of use.     

FDSS中的人工智能技术研究

从财务决策支持系统ＦＤＳＳ的概念出发,介绍了ＦＤＳＳ的结构框架、知识表示、知识推理,重点论述了人工智能技术在ＦＤＳＳ的应用,主要是在实现ＦＤＳＳ的过程中用到的财务知识表示与财务推理机制,并针对具体的财务实例,介绍如何用财务知识表示与如何用财务推理机制的,并给出了结论。     

基于Hypermesh的车架结构模态分析

应用Hypermesh分析某中型载货汽车车架的固有频率,验证与外部激励发生共振的可能性,同时得出分析结论。