从VF过渡到ACCESS数据库学习的探讨分析

由于Visual FoxPro自身存在的一些缺陷,导致其安全性能不高,功能不强大,为弥补缺陷,本文对Visual Fox-Pro和ACCESS从包含的内容、数据类型、表记录的浏览、编程处理语句等方面进行一系列的对比分析,可以帮助熟练VF的用户更好地学习与掌握ACCESS数据库.     

Gait identification with partial occlusion using six modules and consideration of occluded module exclusion

In gait identification, partial occlusion sometimes occurs and leads to missed identification. This paper proposes a gait identification method for partial occlusion case by using six modules and consideration of occluded module exclusion. In this method, a Gait Energy Image (GEI) is separated into four individual modules, and three of neighboring modules are coupled into other two coupling modules. When partial occlusion of a module occurs, the occluded module is detected and excluded from consideration for gait identification. In addition, the combined TDPCA and TDLDA are employed to extract gait features comparing with trained features in the database, and the candidate with the highest score in matching with the database is selected as identified person. To evaluate performance of proposed method, experiments carried out with CASIA dataset with 123 classes and our own EEPIT dataset with 135 classes indicate effectiveness of module separation and significance of exclusion of occluded modules.     

Robust visual tracking base on adaptively multi-feature fusion and particle filter

In order to avoid the tracking failure based on single feature under the conditions of cluttered backgrounds illumination changes, a robust tracking algorithm was proposed based on adaptively multi-feature fusion and particle filter. Color histogram was used to describe the overall distribution characteristics of the target and histogram of oriented gradients containing some construction information and LBP is very effective to describe the image texture features. The Three features were fused in the frame of particle filter. Meanwhile, the weights of each feature were adjusted dynamically. The experimental results show that with adaptive fusion, the tracker becomes more robust to illumination changes, pose variations, partial occlusions, cluttered backgrounds and camera motion.     

Fabrication of l-cysteine-capped CdTe quantum dots based ratiometric fluorescence nanosensor for onsite visual determination of trace TNT explosive

New strategies for onsite determination of trace 2,4,6-trinitrotoluene (TNT) explosives have become a research hotspot for homeland security needs against terrorism and environmental concerns. Herein, we designed a ratiometric fluorescence nanohybrid comprising 3-mercaptopropionic acid-capped green-emitting CdTe quantum dots (gQDs) encapsulated into SiO₂ sphere and l-cysteine (Lcys)-capped red-emitting CdTe QDs (rQDs) conjugated onto SiO₂ surface. The surface Lcys can be used as not only the stabilizer of the rQDs but also the primary amine provider which can react with TNT to form Meisenheimer complexes. Without any additional surface modification procedure, the fluorescence of rQDs equipped with Lcys was selectively quenched by TNT because electrons of the rQDs transferred to TNT molecules due to the formation of Meisenheimer complexes. Meanwhile, the embedded gQDs always remained constant. Upon exposure to increasing amounts of TNT, the fluorescence of rQDs could be gradually quenched and consequently the logarithm of the dual emission intensity ratios exhibited a good linear negative correlation with TNT concentration over a range of 10 nM–8 μM with a low detection limit of 3.3 nM. One can perform onsite visual determination of TNT with high resolution because the ratiometric fluorescence nanosensing system exhibited obvious fluorescence color changes. This sensing strategy has been successfully applied in real samples and already integrated in a filter paper-based assay, which enables potential fields use application featuring easy handling and cost-effectiveness.     

基于纳米金粒子可视化分析检测的研究进展

基于纳米金粒子表面等离子共振性质发展起来的可视化分析,由于具有灵敏度高、可设计性强、分析过程快速等优点已被广泛地应用于各类目标分析物的检测,成为一种极具潜力的分析手段。本文综述了基于纳米金粒子表面等离子共振可视化分析检测的研究进展,并对其发展趋势进行了展望。     

用Visual C++.NET实现基于Raw Socket的网络事件监听器

阐述了基于Raw Socket的以太网事件监听器的设计和实现。在设计上，将Socket提供的API进行了简单的封装，使之符合面向对象编程模式。在实现中，采用了文档／视图模型实现消息的显示和独立的收消息线程来处理阻塞模式下的Socket通信。     

用VF6．0开发串口通信程度及其应用

探讨了如何利用Visual Foxpr6.0的MSComm32控件来实现window98环境下的串行通讯，并通过一个通讯程序实例详细介绍了该控件的使用方法。     

FoxWeb数据库接口软件的配置

介绍了FoxWeb数据库接口软件的配置，对各配置项目的配置内容和注意事项作了描述。同时也简要地介绍了Web服务器的配置。FoxWeb为开发VFP Web应用程序提供了良好的环境，通过合理配置FoxWeb服务器，可以确保脚本程序安全稳定地运行，实现远程VFP数据库的安全访问以及查询结果的动态Web页显示。     

提高VFP数据库访问速度的方法

本文分别从改善本地数据访问的性能和提高远程数据访问的性能两方面探讨了提高VFP数据库访问速度的一些方法和技巧。