Genus zero surface conformal mapping and its application to brain surface mapping

We developed a general method for global conformal parameterizations based on the structure of the cohomology group of holomorphic one-forms for surfaces with or without boundaries (Gu and Yau, 2002), (Gu and Yau, 2003). For genus zero surfaces, our algorithm can find a unique mapping between any two genus zero manifolds by minimizing the harmonic energy of the map. In this paper, we apply the algorithm to the cortical surface matching problem. We use a mesh structure to represent the brain surface. Further constraints are added to ensure that the conformal map is unique. Empirical tests on magnetic resonance imaging (MRI) data show that the mappings preserve angular relationships, are stable in MRIs acquired at different times, and are robust to differences in data triangulation, and resolution. Compared with other brain surface conformal mapping algorithms, our algorithm is more stable and has good extensibility.     

Spatial regularization of the electrocardiographic inverse problem and its application to endocardial mapping

Numeric regularization methods for solving the inverse problem of electrocardiography in realistic volume conductor models have been mostly limited to uniform regularization in the spatial domain. A method of spatial regularization (SR) was developed and tested in canine, where each spatial spectral component of the volume conductor model was considered separately, and a SR operator was selected based on explicit a posteriori criterion at each time instant through the heartbeat. The inverse problem was solved in the left ventricle by reconstructing endocardial surface electrograms based on cavitary electrograms measured with the use of a noncontact, multielectrode probe. The results were validated based on electrograms measured in situ at the same endocardial locations using an integrated, multielectrode basket-catheter. A probe-endocardium three-dimensional model was determined from multiplane fluoroscopic images. The boundary element method was applied to solve the boundary value problem and derive the relationship between endocardial and probe potentials. Endocardial electrograms were reconstructed during both normal and paced rhythms using SR as well as standard, uniform, zeroth-order Tikhonov (ZOT) regularization. Compared to endocardial electrograms measured by the basket, electrograms reconstructed using SR [relative error (RE) = 0.32, correlation coefficient (CC) = 0.97, activation error = 3.3 ms] were superior to electrograms reconstructed using ZOT regularization (RE = 0.59, CC = 0.79, activation error = 4.9 ms). Therefore, regularization based on spatial spectral components of the model improves the solution of the inverse problem of electrocardiography compared to uniform regularization.     

混浊介质中的目标识别及其在交通安全中的应用

结合迷雾天气中车辆交通安全研究的核心内容——目标识别问题,利用斯托克斯/米勒表述和蒙特卡罗方法探讨偏振光在大气这类混浊介质中的传输规律,利用反射米勒矩阵对混浊介质中隐藏的目标物体进行识别。数值计算结果表明,在一定距离之内,利用反射米勒矩阵计算的解偏度能够较好地分辨出混浊介质中隐藏的不同物体。结合迷雾天气的具体特点,分析有效识别距离的大小,定量说明了识别距离大于能见距离,高于直接利用人眼识别的水平。     

GSM-R系统与应用

介绍了铁路专用通信网的现状及将在铁路专用通信网中采用的铁路移动通信全球系统(GSM—R)的组成．网络结构及特点．主要功能和延伸功能,探讨了铁路对GSM—R网络建设的特殊要求,以及在GSM—R网络建设中需要做的一些工作。     

An embedded FPGA-SoC framework and its usage in moving object tracking application

Design Automation for Embedded Systems - Moving object tracking is a computation-intensive operation that requires accelerating hardware solution. In this work, a high-performance design for mean...     

基于多尺度分析的小波不变矩

本文结合小波多尺度分析和不变矩的优点,通过坐标变换和几何规范化等预处理,提出了一种能提供多尺度分析且具有平移、尺度和旋转不变性的矩特征描述子-小波不变矩,并给出了其不变性证明.讨论了不同类型和阶数的小波函数对小波不变矩识别性能的影响.实验结果表明,由合适消失矩阶数的、对称紧支集双正交小波函数得到的小波不变矩具有最佳的分类特性.     

Certificateless deniably authenticated encryption and its application to e-voting system

Telecommunication Systems - The concept of deniably authenticated encryption (DAE) is presently significant in cryptography due to its security properties and wide range of application. It achieves...     

Decoupled preview control system and its application to inductionmotor drive

This paper shows that optimal preview control system approaches to a decoupled preview control system as the weighting factors for the control input variables in the quadratic performance index tend towards zero. Therefore, to examine the characteristics of the decoupled preview control system also means to examine the asymptotic characteristics of the optimal preview control system. By this property, relationships between the design parameters and the response of the optimal preview control system become clear and the design of the optimal preview control can be simplified by utilizing the properties that the decoupled preview control system features. Further, the decoupled preview control method is applied to the vector control system for an induction motor drive. By this application, a trade off between the conditions of the vector control and the magnitude of input variables becomes easy. To demonstrate the significance of this proposed method, simulation results of this application are carried out     

远程教学系统及应用

从网络结构、性能模块等方面介绍中兴通讯公司为埃塞俄比亚提供的远程教育方案,该方案针对非洲地区国家进行了节能和环保方面的优化设计.     

基于随机加权估计的Sage自适应滤波及其在导航中的应用

为了克服Kalman滤波和Sage自适应滤波的缺点,在分析基于新息向量、残差向量和状态改正数向量的自适应协方差估计存在问题的基础上,提出根据新息向量、残差向量和状态改正数对滤波精度影响的不同程度,采用随机加权法对新息向量、残差向量和状态改正数进行估计,以得到观测噪声协方差矩阵和系统动态噪声协方差矩阵.进一步,利用随机加权法对观测噪声协方差阵和系统噪声协方差阵进行估计,以提高动态导航定位的滤波解算精度.研究结果表明,基于随机加权估计的Sage自适应滤波效果明显优于基于算术平均值估计的滤波方法.     

An explicit knowledge-embedded space mapping technique and its application to optimization of LTCC RF passive circuits

A novel explicit knowledge embedded space mapping (SM) optimization technique is presented in this paper. It generalizes the implementation procedure of the efficient SM technique by introducing a buffer space called embedded knowledge space between the original coarse model space and the fine model space, where the ingredients of the coarse model space can be completely different from those of the fine model space. Therefore, this generic scheme can be used to map the coarse model space of arbitrary physical content to the fine model space of different physical content through the embedded knowledge space that is built up with the available radio frequency (RF) circuit CAD formula. The emphasis of the application of the proposed scheme is put on the design of low temperature cofired ceramic (LTCC) RF passive circuits in this paper, along with the required CAD formulas (knowledge) for typical embedded multilayer passives. The effectiveness of the proposed new scheme is demonstrated through two design examples of LTCC lumped element band pass filters for wireless applications. The detailed procedure and flowchart of the proposed implementation scheme are also given in the paper.     

WiMAX体系结构和应用

介绍了以IEEE802.16标准为基础的无线城域网技术WiMAX的发展过程,分析了无线城域网体系结构,包括物理层技术特点、MAC层的QoS保证机制,并对WiMAX的几种典型应用进行了分析.     

IC卡及其应用系统设计

本文简单介绍了ＩＣ卡的性能特点，读写设备及应用领域，给出了ＩＣ卡典型应用系统的硬件构成及功能特点。     

全球星系统及其应用

目前，在个人卫星移动通信领域处于龙头位置的是全球星系统，是由48颗低轨卫星和若干个关口站组成的全球个人卫星移动通信系统。该系统由美国LORAL公司和QUALCOMM公司发起，12家地面通信运营商和设备制造商筹资建设。全球星系统并没有替代现有的地面电信网络，它是通过卫星网与     

New method analyzing eye patterns and its application to high-speedoptical transmission system

An advanced method of analyzing eye patterns is proposed which plots the eye pattern as a function of the error rate. The method is applied to high-speed optical-transmission systems and its usefulness is confirmed. Degradation of eye opening due to noise and intersymbol interference is investigated quantitatively using the 10^-10 BER eye. An automatic gain-control system is evaluated from a viewpoint of eye margin, and a gain control system having an improved eye margin performance is proposed. Low-probability abnormal phenomena, such as turn-on fluctuations and mode partitioning in directly modulated distributed feedback (DFB) lasers, are observed using this method     

超混沌Lorenz系统的投影同步及其在保密通信中的应用

针对单向耦合超混沌Lorenz系统,通过引入坐标变换分析了投影同步的产生机理,同时研究了比例因子与耦合系统初值选取的关系.提出一种新颖的图像信息传输方案,理论与数值研究表明,此方案不仅能够实现对图像的无失真恢复,而且具有较高的安全性.     

EPON系统中嵌入式系统的研究与应用

阐述了千兆以太无源光网络（EPON）系统。结合EPON系统的功能要求，指出嵌入式Linux系统是EPON系统软件设计较好的平台，提出了嵌入式Linux系统在EPON系统中的应用。     

基于.NET技术的通用系统多层对象模型的构建

通过对应用系统分层原理的论述,详细说明应用.NET技术构建针对通用系统的多层对象模型的过程:包括利用.NET数据提供组件完成数据访问层各组件核心功能、以类型化数据表的对象展开的领域逻辑层各组件分析的方法以及领域逻辑层中针对多个对象的事务型管理等.最后例举了应用本套通用对象模型实现的应用系统实例.     

互联互通网间监测系统及应用

为了有效实现对电信网间互联互通情况和通信质量的实时监测，增强电信监管部门和司法部门调查取证的能力，保护各电信运营企业以及普通电信用户的合法权益，我国已全面建设网间结算及互联互通监测系统。介绍电信网间互联互通监测系统的应用情况及主要功能。