Featured Research

from universities, journals, and other organizations

Better And Faster Search Engines

Date:
June 3, 2009
Source:
The Swedish Research Council
Summary:
Internet search engines virtually always create a ranking of all pages, and then they choose only those pages that contain the right words. A new approach yields more relevant hits and faster search engines.

Internet search engines virtually always create a ranking of all pages, and then they choose only those pages that contain the right words. In his doctoral dissertation, Ola Ågren, Umeå University in Sweden, describes a new approach that yields more relevant hits and faster search engines.

The goal of all search engines is to attain the most relevant responses as quickly as possible. When search engines calculate their search results, they are steered by an algorithm that assigns higher or lower values to features of Web pages. The most common search engines on the Net, such as Google, generate a gigantic single ranking based on a search of all pages available on the Net.

The algorithm that Ola Ågren has developed ranks pages, instead, on the basis of each relevant starting page, and includes pages that are directly or indirectly linked to by the starting page. Then a normalised mean value of the relevance of the various pages is calculated.

A page that has links to it from several different pages is therefore assigned a higher value than those that are found only once. In this way it is faster to find pages of interest. For ordinary standard algorithms it takes more than seven days to go through and rank Web pages in a certain database. Using his algorithm, Ola Ågren has managed to do this in 158 seconds.

What’s more, his algorithm has proven to yield the most relevant responses. He studied the relevance of hits in the top ten lists for three different algorithms: the one he developed and two variants of PageRank, the algorithm used by Google. He examined a total of 100 different expressions for all Nordic languages and English, including the expression master of engineering science (civlingeniör in Swedish).

The top ten lists always had some form of overlapping between the different algorithms, but they were never completely identical. Users were then asked to judge the relevance of the various hits, without knowing which search engines had generated the alternative responses.

“The users in the study found that the search engine I developed is better than the others in more than 60 percent of cases,” says Ola Ågren.

Besides search engines, the dissertation is also about methods for finding structures in huge masses of information, such as keywords and methods for extracting free text, such as parts of the documentation from the source code.

Thesis abstract.


Story Source:

The above story is based on materials provided by The Swedish Research Council. Note: Materials may be edited for content and length.


Cite This Page:

The Swedish Research Council. "Better And Faster Search Engines." ScienceDaily. ScienceDaily, 3 June 2009. <www.sciencedaily.com/releases/2009/06/090602083352.htm>.
The Swedish Research Council. (2009, June 3). Better And Faster Search Engines. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2009/06/090602083352.htm
The Swedish Research Council. "Better And Faster Search Engines." ScienceDaily. www.sciencedaily.com/releases/2009/06/090602083352.htm (accessed July 31, 2014).

Share This




More Computers & Math News

Thursday, July 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services


Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



      Save/Print:
      Share:  

      Free Subscriptions


      Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

      Get Social & Mobile


      Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

      Have Feedback?


      Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
      Mobile iPhone Android Web
      Follow Facebook Twitter Google+
      Subscribe RSS Feeds Email Newsletters
      Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins