无线数据网场景研究软件的开发

针对由于用户对数据业务需求的增大导致的数据网规划难度加大的问题,设计结合数据业务特征以及用户特点,按照数据业务呑吐量大小与移动性,将现有数据网划分为四个数据业务场景加以探讨.结合Oracle 10g数据库开发的基于Visual Basic的场景分析软件,给网优人员提供及时有效的参考信息.试验证明,该软件具备较强的扩展性与实用性,可对网优人员的规划与优化工作提供相当的便利.     

基于MSComm控件的GPS接收机数据终端接口设计

首先介绍全球定位系统(GPS)的基本工作原理及其通常所采用的通信协议,在此基础上以SiRF Technology公司出品的GPS芯片为例,讨论采用Visual Basic 6.0的MSComm控件实现GPS接收机与PC机间通过串口(RS 232)传输和提取定位信息的方法,并给出部分程序代码及运行结果。     

基于C++语言的多维动态数组的实现

在用Visual C 语言处理复杂和庞大的数据时,常需要用到多维动态数组来管理,但开辟多维动态数组时指针的使用是极为复杂和难于理解的。针对这一问题,利用“递推”的思想进行研究,给出快速有效地建立多维动态数组的C 代码的思路和方法,并给出详细代码。经过验证此方法是可行的,从而为较好地解决这类问题带来很大的方便。     

对科技期刊《信号处理》的分析研究

本文以《信号处理》刊载的论文数量、内容、作者群分布作为分析研究对象,进行了定量的分析与评价.     

A sorbent tube for oral malodour monitoring

Volatile sulphur compounds (VSCs) and particularly hydrogen sulphide are considered as the predominant gases causing oral malodour. In this paper, a simple alarm sensor has been developed for VSCs determination in mouth air. The device consists of a glass tube packed with a solid sensing phase. The VSCs react with the sensing phase to produce a change in the colour of the sensor visible with a naked eye.Different “reagents” were investigated to develop the sensing phase (neocuproine + Cu(II), bathocuproine + Cu(II), resazurin, 2,6-dichlorophenolindophenol and lead acetate), finding the neocuproine + Cu(II) as the best for our purposes. Also, different substrates such as Amberlite XAD-4 and XAD-7 and different trademarks of silica gel were tested as solid supports, being selected the silica gel.A device consisting of a glass tube packed with the sensing phase was optimized and tested with halitosis patients as a rapid illness test and the results compared with those obtained with a commercially available instrument, the Halimeter™, used for the determination of VSCs in mouth air. The results exhibited acceptable agreement between the proposed “qualitative” alarm sensor and a commercially available technique selected as reference, showing the possibility of using this “visual sensor” to control the halitosis and its evolution with an eventual treatment, by the own patient.     

In vivo mapping of functional domains and axonal connectivity in cat visual cortex using magnetic resonance imaging

Noninvasive cognitive neuroimaging studies based on functional magnetic resonance imaging (fMRI) are of ever-increasing importance for basic and clinical neurosciences. The explanatory power of fMRI could be greatly expanded, however, if the pattern of the neuronal circuitry underlying functional activation could be made visible in an equally noninvasive manner. In this study, blood oxygenation level-dependent (BOLD)-based fMRI and diffusion tensor imaging (DTI) were performed in the same cat visual cortex, and the foci of fMRI activation utilized as seeding points for 3D DTI fiber reconstruction algorithms, thus providing the map of the axonal circuitry underlying visual information processing. The methods developed in this study will lay the foundation for in vivo neuroanatomy and the ability for noninvasive longitudinal studies of brain development.     

Multivariate Polynomial Minimization and Its Application in Signal Processing

We make a conjecture that the number of isolated local minimum points of a 2n-degree or (2n+1)-degree r-variable polynomial is not greater than n ^r when n 2. We show that this conjecture is the minimal estimate, and is true in several cases. In particular, we show that a cubic polynomial of r variables may have at most one local minimum point though it may have 2^r critical points. We then study the global minimization problem of an even-degree multivariate polynomial whose leading order coefficient tensor is positive definite. We call such a multivariate polynomial a normal multivariate polynomial. By giving a one-variable polynomial majored below a normal multivariate polynomial, we show the existence of a global minimum of a normal multivariate polynomial, and give an upper bound of the norm of the global minimum and a lower bound of the global minimization value. We show that the quartic multivariate polynomial arising from broad-band antenna array signal processing, is a normal polynomial, and give a computable upper bound of the norm of the global minimum and a computable lower bound of the global minimization value of this normal quartic multivariate polynomial. We give some sufficient and necessary conditions for an even order tensor to be positive definite. Several challenging questions remain open.     

ICT并行重建算法设计与实现

分析了三维ICT近似重建FDK快速算法以及算法串行执行与并行执行的复杂度,利用MPI并行编程环境,对原有ICT重建流程进行并行化,在PC集群上实现了并行ICT重建,进行了系统集成。给出了系统应用实现的解决方案与软件集成流程图。实验结果证明串行重建和并行重建结果是一致的,并行重建可以得到比较理想地重建时间结果和比较理想的加速比与效率。     

基于虚拟现实技术的可视化生态复垦

虚拟现实技术是计算机前沿技术，复垦是一门久已存在、发展的古老又充满生机的学科。虚拟现实技术与生态复垦技术的结合，能互动真实地看到复垦效果。获得前所未有的直观感受，将成为矿山优化设计的重要手段；可用VC＋＋为编辑环境，基于OpenGL编程来实现三维虚拟现实技术。     

波长可变光源及数据联合采集的计算机实现

为了研究聚合物电介质材料内部的空间电荷及陷阱结构,设计并搭建了光致放电(PSD)测试系统。针对系统要求及设备的现有配置,在Visual C .net2003开发环境下,利用MSCOMM串口通信控件,通过编写和调用设备的OCX,实现了波长随时间线性连续变化的光源,并且实现了单色仪与静电计数据的联合采集。