火棘红色素的提取及性能研究

从蔷薇科植物大棘的果中提取天然红色素,对提取条件进行了优化实验,并对色素的理化性能进行了研究。     

A survey on evaluation of summarization methods

The increasing volume of textual information on any topic requires its compression to allow humans to digest it. This implies detecting the most important information and condensing it. These challenges have led to new developments in the area of Natural Language Processing (NLP) and Information Retrieval (IR) such as narrative summarization and evaluation methodologies for narrative extraction. Despite some progress over recent years with several solutions for information extraction and text summarization, the problems of generating consistent narrative summaries and evaluating them are still unresolved. With regard to evaluation, manual assessment is expensive, subjective and not applicable in real time or to large collections. Moreover, it does not provide re-usable benchmarks. Nevertheless, commonly used metrics for summary evaluation still imply substantial human effort since they require a comparison of candidate summaries with a set of reference summaries. The contributions of this paper are three-fold. First, we provide a comprehensive overview of existing metrics for summary evaluation. We discuss several limitations of existing frameworks for summary evaluation. Second, we introduce an automatic framework for the evaluation of metrics that does not require any human annotation. Finally, we evaluate the existing assessment metrics on a Wikipedia data set and a collection of scientific articles using this framework. Our findings show that the majority of existing metrics based on vocabulary overlap are not suitable for assessment based on comparison with a full text and we discuss this outcome.     

一种图像边缘提取快速KIRSCH算子的设计与实现

对前人提出的数字图像边缘的经典算子--kirsch算子进行研究,详细分析了这种方法的出发点、理论根据、数学原理和实现方法及优缺点。并通过用Visual C++实现的实验结果,对kirsch算法提出了改进,实现了改进的快速kirsch算子的边缘提取,给出了对于一般图像的处理效果的分析。     

人在边缘--论严歌苓旅外小说中的女性形象

旅美女作家严歌苓素有"多产多奖"作家之称.她所提供的一系列关于移民 /旅居生活的小说,为我们展开了一幅异域生活的真实画卷.本文试以严歌苓小说中的女性人物形象为核心,分析严歌苓域外小说中的边缘书写及其所表现的移民者的边缘处境.并试图透过人物形象描写的表层透视作者内心对人性内涵的关注及其华文写作的深层意义既是对自己的边缘身份进行某种确认,也是作者反抗中心与主流、证明自我存在的价值与意义的一种方式.     

基于HTMLParser的Web文献信息提取

基于HTMLParser对网页进行解析,可抽取标签间的Link、image、meta和title等信息。使用HTMLParser来提取Web文献中的题名、关键字、摘要、作者、来源等信息,清洗后存入MySql数据库当中,以备后续数据挖掘使用。对此进行了论述。     

一种基于改进Pal.King算子的AVI视频边缘检测研究

本文全面分析了Pal.King模糊边缘检测算法存在的缺陷,提出了一种新的改进型Pal.King模糊边缘检测算法,并将其应用到AVI视频边缘检测。该算法针对Pal.King算法中对隶属度阈值的设置存在的不足,通过重新定义模糊隶属度函数,反复实验,确定了各参数的最佳值。仿真结果比较显示,改进后的算子复杂度得到降低,效率得以显著提高,边缘检测效果更佳。     

中药巴戟天中蒽醌的提取与测定

选用适当的提取和水解方法,利用蒽醌与醋酸镁的显色反应,以1,8-二羟基蒽醌为对照品,采用分光光度法分别对中药巴戟天中游离和结合蒽醌衍生物的含量进行了测定。实验证明巴戟天中蒽醌含量较高,且结合蒽醌含量远大于游离蒽醌含量,精密度良好,回收率较高,为正确评价其药效,合理开发该药提供了参考依据。     

Web页面列表信息的自主抽取

本文研究了对于Web页面列表信息的抽取方法。通过对超文本文档特征的分析获取抽取知识,并通过自学习适应页面的变化,实现了对于列表信息的抽取。