QM-Y系半导体气敏传感器的失效分析

通过对气体传感器的可靠性试验,得到了元件失效的主要类型,对失效元件从微观和宏观进行了分析,找到了一些引起元件失效的主要原因,对元件的实际应用和批量生产有着极其重要的价值。     

多维逆M序列及其在多变量系统辨识中的应用

基于Ｍ序列和逆Ｍ序列,提出了多维逆Ｍ序列发生器的结构形式。多维逆Ｍ序列近似周期白噪声,无直流分量,各维序列之间互不相关。言语中研究了多维逆Ｍ序列的性质,给出了自相关函数的计算公式。通过使用多维逆Ｍ序列,将多变量系统参数辨识简化为各通道对应的单变量系统参数辨识。多维逆Ｍ序列具有很好的推广应用价值。     

用于三维图像恢复的广义点扩展函数

采用传统的摄像系统点扩展函数恢复三维图像,往往不能得到满意的结果。文中提出一种新的概念－广义点扩展函数,取代传统的摄像系统点扩展函数,用于三维图像恢复。首先给出广义点扩展函数的定义,它等于物体和场景到摄像系统的点扩展函数与摄像系统的点扩展函数的券积。然后给出物体和场景到摄像系统的点扩展函数估计。最后还给出采用广义点扩展函数恢复三维图像的实验结果。实验结果表明,采用广义点扩展函数恢复三维图像,比采用     

分布式仿真中实时网络通讯技术研究

该文分析了提高对网络通讯实时性五项技术措施。利用软件编程技术实现仿真计算机之间的时钟同步,并建立多任务多进程并发通讯机制以及介于ＴＣＰ／ＩＰ和ＵＤＰ／ＩＰ之间的中间传输协议支持技术,从而保证网络仿真环境的畅通无阻和交互信息的实时传输。     

Theoretical research progress in new-generation Internet architecture

Internet has become the most important information infrastructure supporting modern socio-economic development, social progress and technological Innovation. Invented 30 years ago, today Internet is facing increasingly severe technical challenges. This paper introduces the progress of the major international newgeneration Internet research plans; analyzes its basic characteristics and the principal contradictions during the development; detsiledly introduces the research carried out by 973 Project ＂Research of Future Internet Architecture＂ on the key scientific issues of new-generation Internet architecture and its latest research results; and looks to the future of the research-focus faced with the new situations of the basic research of new-generation Internet architecture as well as the new demands of innovative applications on Internet architecture.     

工作流管理系统技术现状及其发展趋势

随着计算机技术的发展和应用,工作流管理技术势必成为企业集成业务流程、节约运作成本的重要环节,工作流技术正经历迅猛发展,新型的工作流管理系统不断出现,有必要对工作流技术的发展现状及其趋势做一个总结,本文主旨也正在于此。     

An encoding-based dual distance tree high-dimensional index

The paper proposes a novel symmetrical encoding-based index structure, which is called EDD-tree （for encoding-based dual distance tree）, to support fast k-nearest neighbor （k-NN） search in high-dimensional spaces. In the EDD-tree, all data points are first grouped into clusters by a k-means clustering algorithm. Then the uniform ID number of each data point is obtained by a dual-distance-driven encoding scheme, in which each cluster sphere is partitioned twice according to the dual distances of start- and centroid-distance. Finally, the uniform ID number and the centroid-distance of each data point are combined to get a uniform index key, the latter is then indexed through a partition-based B^＋-tree. Thus, given a query point, its k-NN search in high-dimensional spaces can be transformed into search in a single dimensional space with the aid of the EDD-tree index. Extensive performance studies are conducted to evaluate the effectiveness and efficiency of our proposed scheme, and the results demonstrate that this method outperforms the state-of-the-art high-dimensional search techniques such as the X-tree, VA-file, iDistance and NB-tree, especially when the query radius is not very large.     

工作流管理系统技术现状及其发展趋势

随着计算机技术的发展和应用,工作流管理技术势必成为企业集成业务流程、节约运作成本的重要环节,工作流技术正经历迅猛发展,新型的工作流管理系统不断出现,有必要对工作流技术的发展现状及其趋势做一个总结,本文主旨也正在于此。     

基于SOPC的USB密码模块硬件与固件设计

SOPC是一种灵活、高效的软硬件解决方案。本文在研究SOPC密码模块设计技术的基础上,提出了基于SOPC的USB密码模块“双核＋双总线”硬件架构;针对此架构,设计实现了MCU、双核协调控制、内部总线桥,完成了其固件功能的编程,并通过实验验证了该密码模块的正确性。     

SPI总线的UART扩展方法

借助于微处理器的SPI总线接口,利用NXP公司的一款芯片SC16IS752,提出一种基于SPI转UART的软硬件设计方案;着重介绍SPI-UART转换原理,并结合实际的应用系统,讨论了整个设计的可行性和实用性.实际应用表明,该方案经济、实用.