دانلود A Comparative Study of Ranking Techniques for Hidden Web and Surface Web

Abstract

The  web  consist  of  Surface  web  and  hidden  web.  Surface  web is  also  known  as  publically  indexable web. It  can be accessed  by search engines using hyperlinks present on the pages and using simple keyword matching schemes. Hidden web refers to content that is hidden behind HTML forms. This contains a large collection of data that are  unreachable  by  link-based  search  engines.  A  study  conducted  at  University  of  California,  Berkeley  estimated that the  deep  web  consists  of  around  91,000  terabytes  of  data,  whereas  the  surface  web  is  only  about  167 terabytes. The hidden and surface web crawlers return huge result set for the user query. But users commonly look at top ten or twenty results that can be seen without scrolling. Users rarely look at results coming after first response page so ranking of the results  is  needed. Till  now  ranking  of  the  web  data  is  a  big  challenge.  Various  scholars  tried  to propose better  and efficient techniques for ranking. In this paper, various ranking methods for the hidden web as well as surface web will be explored.