一种内嵌导磁槽的圆感应同步器

圆感应同步器是一种高精度角度传感器,传统的圆感应同步器的转子需外引激励线以驱动其工作,鉴于圆感应同步器在使用过程中需要连续旋转,这将使得外引激励线存在绞线的问题,本文提出一种新的设计方法,在圆感应同步器的定、转子基体上嵌有环状的金属导磁槽,导磁槽内放入环状金属导线.通过给定子导磁槽内的环状金属导线施加激励信号,此激励信号可耦合到转子导磁槽内的环状金属导线中以驱动转子工作,这使得转子无需外引激励线,进而提高了系统应用的便利性以及可靠性.     

基于VB的网络考试综合系统的设计与实现

网络考试综合系统是传统的考试与先进的网络模式相结合的网络化考试平台,能够自动地有效地完成试题的抽取、组卷、阅卷、管理等操作,提高考试的效率。Visual Basic具有面向对象的可视化设计环境、事件驱动的编程机制、支持多种数据库访问、网络功能等特点。使用Visual Basic开发的网络考试综合系统具有较强的实用性和可移植性。     

An interactive lung field segmentation scheme with automated capability

Feasible clinical application of any automated segmenting methodology demands more than just accuracy. Amendment to the automated delineation is necessary when the algorithm fails, however, integrated solution to such a scenario is largely absent in literature. Hence in this survey we devised an architecture that does both the automated and interactive lung field localizations using a single segmenting engine—random walker algorithm—so that intuitive amendment is only necessary when the automated generated delineation is unsatisfactory. The algorithm proceeds by first extracting 18 intensity profiles running horizontally, each of them equally spacing apart, and in each intensity profile three extreme points denoting the two lungs and the esophagus are determined through profile matching. This done, the algorithm removes profiles that do not intersect with the lung, and the rest of the extreme points are plugged into random walker algorithm to perform segmentation. The achieved accuracy in localization by the above was 0.8875 in terms of overlap measure (the maximum value for this parameter is 1) over 341 images. In the case where unsatisfactory delineation prompts amendment necessary, the user can interactively segment the lung by just a shift on some of the previous-determined points to the desired locations, and random walker algorithm is run again with the amended input. By such a fusion, the benefits of both the automated and interactive segmentation are shared in a single architecture.     

结合Gabor小波和监督保局投影的人耳识别

针对人耳识别中人耳的角度变化这个难点问题,提出一种结合Gabor小波和监督保局投影的人耳识别算法.由于Gabor特征维数高、冗余大,首先通过统计样本的边缘点再采样的方法对人耳进行稀疏的描述,然后利用类别可分离性判据评价Gabor展开系数的分类能力,选择最有利于识别的Gabor展开系数构造新的Gabor特征.在人耳库中的实验结果表明,采用文中算法提取的Gabor特征维数少、鉴别能力强,结合监督保局投影进行识别取得了很高的识别率,对于人耳角度的变化具有良好的鲁棒性.     

浅析电子商务中的安全问题

随着现今社会互联网、个人终端技术的飞越发展,电子商务越来越多的出现在人们的生活与工作中,这种全新的商务模式具有便捷、高效率、低成本的特点.同时,这种全新的商务模式对管理水平、信息传递技术都提出了更高的要求,其中安全的重要性尤为突出.     

B/S模式下油指纹数据库动态更新机制研究

油指纹库和溢油鉴别系统的构建对溢油鉴别具有重要意义,而数据库更新对保持数据库的现实性又有着重要的作用。本文首先阐述地理信息系统（GIS）数据库更新的含义,然后介绍数据库增量更新和完全更新两种机制。在对油指纹数字化鉴别系统的数据内容以及对数据更新具体需求分析的基础上,讨论系统B/S（Browse/Server）部分的数据更新机制,并详细论述更新机制的实现过程。     

数字图书馆统一身份认证及综合应用研究

主要探讨利用数字证书技术实现数字图书馆的用户或读者全国统一身份认证,并在此基础上探讨数字图书资料在科研项目立项和研究成果水平鉴定,教师的教学水平和研究水平评估,启发与激励科研和教学人员及学生的创造力、创新能力等方面的综合性应用。     

Nano-composite ZrO2/Au film electrode for voltammetric detection of parathion

This work describes the fabrication of ZrO₂/Au nano-composite films and its application for voltammetric detection of organophosphate pesticides. The nano-composite ZrO₂/Au film was prepared through a combination of sol–gel procedure and electroless plating that can be carried out in a general chemistry lab with no need for special facilities and reagents. The sensing performance of the ZrO₂/Au nano-composite film electrode toward parathion was studied with square wave voltammetry. The nano-ZrO₂ showed a strong affinity toward the phosphate group on parathion molecules, which provides sensitivity and selectivity of the sensing film. A linear relationship was obtained between the peak currents and the concentration of parathion, with a detection limit for standard samples of 3 ng/ml. In addition, interference studies showed that structurally similar compounds without phosphate groups would not interfere with the response toward parathion of the film electrode.