基于PB的通用数据编辑界面的研究与实现

根据MIS系统的数据编辑特点，本文指出静态数据编辑界面的缺陷以及目前采用的动态编辑界面的不足，提出一种新的界面创建思路并在PB中得以实现。与以往系统相比，该方案不仅实现了数据编辑界面独立于后台的数据库结构，并在参照完整性的约束和数据权限控制方面做了大量的工作。在实际应用中，通过封装成类库文件可方便地应用到其他MIS系统，具有很高的通用性和可重用性。     

互关联后继树在时间序列特征模式挖掘中的应用

在文献[1]中提出的基于互关联后继树（IRST）的时间序列特征模式挖掘方法的基础上,加入了时间窗口的概念,以弥补IRST这种原本应用于文本检索中的索引模型在时间序列应用中的不足.对IRST以及挖掘算法做出了改进,弥补了其只能挖掘出紧密衔接特征模式的缺陷.实验结果表明,该方法可以挖掘出更多更具应用价值的特征模式.     

New Rate Allocation Method for MPEG-4 FGS Video Streaming

A new rate allocation method for fine-granular scalability (FGS) coded bltstreams is presented in order to achieve smooth quality reconstruction of frames under channel conditions with a wide range of bandwidth variation and improve the average PSNR of the whole sequence. Based on a quality weighted bit allocation method, a sliding window rate allocation method is proposed for the first time so that the window can slide along the video sequence with a certain sliding step. Experimental results show that, under dynamic bandwidth conditions, the proposed method can simultaneously satisfy the requirements for improving average PSNR of the whole video sequence greatly and reducing the fluctuations between adjacent frames greatly.     

A new family of windows — convolution windows and their applications

A new family of windows is constructed by convolutions via a few rectangular windows with same time width and is thus referred to as convolution windows. The expressions of the second-order up to the eighth-order convolution windows in both the time and frequency domains are derived. Their applications in high accuracy harmonic analysis of periodic signals are investigated. Comparisons between the proposed windows and some known windows with the same width shows that, when the synchronous deviation of data sampling is slight, the proposed ones have the least effect of spectral leakage. Therefore, the new windows are well suited for high accuracy harmonic analysis and parameter estimation for periodic signals. The error analysis and computer simulations show that the estimation errors, corresponding to frequency, amplitude and phase of every harmonic component of a signal, are proportional to the pth power of the relative frequency deviation in case of the pth-order convolution window is applied to windowing signal of approximately p cycles. By introducing real time adjustment in sampling interval, the proposed algorithm can adaptively trace signal frequency and lead to less sampling synchronous deviation. The proposed approach has the advantages of easy implementation and high measure precision and can be used in harmonic analysis of quasi-periodic signals whose fundamental frequency drifts slowly with time.     

基于双语词典的汉英词语对齐算法研究

研究利用多部人读双语词典扩充双语词典的规模来改善词语对齐质量。介绍了一个在Ker算法基础上用双语词典进行汉英词语对齐的算法。提出了对齐窗口的概念，通过在对齐过程中设置对齐窗口，可以找到多对多的词语对应。     

Powbuilder8.0中任意组合查询方法的实现

介绍了在Powbuilder8．0环境中常用查询方法，给出了利用数据窗口实现任意组合查询的设计方案，比较了常用查询方法在不同数据量时其查询性能的差别。     

基于动态链接库模块视窗菜单外部控制的软件开发

文中提出了基于动态链接库模块的视窗菜单外部动态控制及配置管理的软件设计新思路，然后在Borland Delphi6．0集成开发环境(IDE)下给出了一个系统设计实例。运用这种技术，可以在不修改系统主程序源代码的基础上，任意配置和扩展软件系统的相关功能模块，从而增强了软件系统对应用环境的动态适应能力，也减轻了软件系统升级面临的复杂度。     

矩形窗口的曲线裁剪算法

本文研究了矩形窗口的曲线裁剪问题，对现有的文献资料作了一个简单介绍后，提出了一个新的矩形窗口的圆和椭圆的裁剪算法。该算法与原有算法相比，在计算量和算法复杂度方面均有较大的改进。     

通用多边形的线裁剪及其在二维零件装配图消隐中的应用

裁剪算法是计算机图形学的一个最基本的算法，但大多数算法都是针对矩形窗口或凸多边形窗口的，已有的凹多边形裁剪主要将其分解为凸多边形处理。本文提出一个凹多边形的快速裁剪算法，并将其用于工程装配图的二维消隐，该算法特别适合已开发的ＡＵＴＯＣＡＤ系统     

应用POWERBUILDER开发资料管理系统

从资料管理系统的功能要求出发,按照MIS开发的原则,提出了文件管理系统的总体设计方案,并在此基础上设计和实现了整个系统。