一种改进的SPIHT图像编码方法

对小波图像压缩的SHHT算法进行了改进，改进算法不再使用链表而是使用两个简单的位图，其占用内存和LZC算法相同而易于硬件实现，改进算法克服了LZC的深度优先搜索的缺点而具有和SPIHT一样的广度优先搜索策略。在同压缩比下，其重构峰值信噪比PSNR比LZC高0．70左右，和SPIHT相当。     

数据挖掘技术在水厂生产分析中的应用

本文在研究数据挖掘方法的基础上,探讨了基于时间序列数据挖掘技术和算法,并探索其在水厂生产分析及控制领域中的应用。在分析水厂工艺生产特点及生产数据的特征后,应用关联规则挖掘技术对离散化后的水厂生产数据进行数据挖掘。     

浸渗/钝化生产线监控系统的研究

针对重庆卡福汽车制动转向系统有限公司的新厂区扩建需要,为了实现对新建的一条具有25工位、国内最长的多功能零部件处理生产线的实时监控,利用PLC与工控机各自的特点建立最优的通信方式,改进现有的工位位置识别方式,利用各种传感器实现工件不同工艺处理的实时监控,建立一套浸渗/钝化生产线实时监控系统,同时给出了工艺工序监控流程与生产线总体监控流程;在实际生产中取得了较好的效果,对其他相似的生产线监控提供了较好的参考.     

某型防空导弹国产化数字板测试仪设计

针对某型防空导弹数字电路板国产化工作,设计了一种用于对仿制板进行功能测试验证的数字板测试仪;测试仪设计引入虚拟仪器的概念,采用层次化、模块化和标准化的思想,硬件方面主要利用CPLD与USB技术实现了系统的通信与控制,软件方面采用Lab Windows/CVI实现了测试仪的应用程序设计;实践证明,该测试仪是一种能够最大限度利用计算机资源、支持热插拔、价格低廉的新型虚拟仪器测试仪,较好地完成了国产化板的功能验证任务.     

利用Web Service保证分布式数据库数据一致的方法研究

随着分布式数据库系统的广泛应用,如何实现多个数据库之间的数据一致已成为系统可靠运行所要解决的重要问题.提出了一种基于Web Service的数据一致性维护方法,它不仅适用于各种分布式数据库,也可应用于相互独立的多个数据库.     

基于移动技术的动态网格聚类算法

为了解决动态网格划分技术中聚类结果对数据输入顺序的依赖性和聚类精度差的问题,提出了基于移动技术的动态网格聚类算法(grid-based clustering algorithm based on shifting technology, GLASS).该聚类算法主要利用了动态网格划分技术和移动网格技术来解决上述问题,且能够识别任意形状、任意大小的聚类,只需一个参数,且时间复杂度是数据集大小和数据维度的线性函数.实验结果表明该算法是有效的.     

On Decidability of Distributed Diagnosis Under Unbounded-Delay Communication

In this note we show that the problem of distributed diagnosis under unbounded communication delay is decidable when there is no inferencing involved among the diagnosers. The notion of joint_infin-diagnosability is introduced to capture the diagnosability property in this setting. We show the equivalence of joint_infin-diagnosability and codiagnosability, which captures the diagnosability property in the decentralized setting (i.e., one involving no communication). Thus the decidability result follows from the decidability of codiagnosability established in a previous paper. We also show that the property of joint_infin-diagnosability is stronger than decentralized-diagnosability introduced in a previous paper     

The Role of 3-D Sound in Human Reaction and Performance in Augmented Reality Environments

Three-dimensional sound's effectiveness in virtual reality (VR) environments has been widely studied. However, due to the big differences between VR and augmented reality (AR) systems in registration, calibration, perceptual difference of immersiveness, navigation, and localization, it is important to develop new approaches to seamlessly register virtual 3-D sound in AR environments and conduct studies on 3-D sound's effectiveness in AR context. In this paper, we design two experimental AR environments to study the effectiveness of 3-D sound both quantitatively and qualitatively. Two different tracking methods are applied to retrieve the 3-D position of virtual sound sources in each experiment. We examine the impacts of 3-D sound on improving depth perception and shortening task completion time. We also investigate its impacts on immersive and realistic perception, different spatial objects identification, and subjective feeling of "human presence and collaboration". Our studies show that applying 3-D sound is an effective way to complement visual AR environments. It helps depth perception and task performance, and facilitates collaborations between users. Moreover, it enables a more realistic environment and more immersive feeling of being inside the AR environment by both visual and auditory means. In order to make full use of the intensity cues provided by 3-D sound, a process to scale the intensity difference of 3-D sound at different depths is designed to cater small AR environments. The user study results show that the scaled 3-D sound significantly increases the accuracy of depth judgments and shortens the searching task completion time. This method provides a necessary foundation for implementing 3-D sound in small AR environments. Our user study results also show that this process does not degrade the intuitiveness and realism of an augmented audio reality environment     

基于蚁群优化算法的目标拆卸序列规划

为了能够以较高的效率求解出产品中目标零件的拆卸方案,基于产品中零件间的拆卸优先约束关系,提出并建立目标零件的拆卸层次信息图模型,将目标零件的拆卸序列规划问题转化为对该图模型中具备最优值的路径的搜索和寻优问题.同时,提出一种改进蚁群优化算法,以实现对目标零件拆卸层次信息图的构建和对拆卸方案的搜索与寻优.最后通过实例验证了该方法的可行性和计算效率.     

基于索引技术的个性化教学资源库的设计

本文介绍了当前对教学资源库建设的特点,针对他们的不足,提出了个性化教学资源库建设的需求,论述了它的必要性和可行性,并进一步提出了基于索引技术的个性化教学资源库建设的系统架构,最后归纳总结并提出了进一步研究的方向。