Lowden

       1. Information Filtering [信息过滤]
           1.1 Information Collection [信息采集]
           1.2 Natural Language Understanding [NLU 自然语言理解]
                 1.2.1 Word Splitting [分词]
                 1.2.2 POS Tagging [词性标注]
                 1.2.3 Technical Terms Recognition [专名识别]
                 1.2.4 Lexical Analysis [词法分析]
                 1.2.5 Syntax Analysis [语法分析]
                 1.2.6 Semantic Analysis [语义分析]
                 1.2.7 Discourse Analysis [语篇分析]
                 1.2.8 Document Automatic Categorization [自动分类]
                 1.2.9 Subject Extraction [主题提取]

       2. Information Retrieval [信息检索]
          2.1 Robot/Agent/Spider [智能体]
          2.2 build index [索引]
          2.3 mulitple agents [多智能体]
           2.4 Indexer [检索]

       3. Search Engine [搜索引擎]
           3.1 apache module [apache模块]
           3.2 Full-Text Search [全文检索]
           3.3 Intelligent Matching [智能匹配]
           3.4 Distributed Search Engine [分布式搜索引擎]

       4. Data Mining [数据挖掘]
           4.1 Data Excavating [数据采掘]
           4.2 Intelligent Navigation [智能导航]
           4.3 Data Bank [数据仓库]
           4.4 Knowledge Discovering [知识发现]
           4.5 Question-Answering System [问答系统]
           4.6 Knowledge-Based System [专家系统]