因特网的迅速发展对万维网信息的查找与发现提出了巨大的挑战. 对于大多用户提出的与主题或
领域相关的查询需求, 传统的通用搜索引擎往往不能提供令人满意的结果网页 …

Performance of any search engine relies heavily on its Web crawler. Web crawlers are the
programs that get webpages from the Web by following hyperlinks. These webpages are …

Information retrieval (IR) has changed considerably in recent years with the expansion of the
World Wide Web and the advent of modern and inexpensive graphical user interfaces and …

Cultural artifacts of the past have always had an important role in the formation of
consciousness and self-understanding of a society and the construction of its future. The …

Topical crawling is a young and creative area of research that holds the promise of
benefiting from several sophisticated data mining techniques. The use of classification …

Context of a hyperlink or link context is defined as the terms that appear in the text around a
hyperlink within a Web page. Link contexts have been applied to a variety of Web …

Sentiments and opinions expressed in Web pages towards objects, entities, and products
constitute an important portion of the textual content available in the Web. In the last decade …

Many Web IR and Digital Library applications require a crawling process to collect pages
with the ultimate goal of taking advantage of useful information available on Web sites. For …

The traditional process of focused web crawler is to harvest a collection of web documents
that are focused on the topical subspaces. The intricacy of focused crawlers is identifying the …

Focused crawlers are effective tools for applications requiring a high number of pages
belonging to a specific topic. Several strategies for implementing these crawlers have been …