Query phrase ( Biword index , Positional index )

Query phrase ( Biword index , Positional index ,and Combination schemes )
http://www.2shared.com/file/acDcf8lb/Biword_index.html

Sample from real positional index 

Query processing in inverted index

Query processing [PPT]
http://www.2shared.com/file/_Ah04y4n/Qurey_processing.html

Boolean Retrieval

Boolean Retrieval PPT
http://www.2shared.com/file/7-E8TGkl/Boolean_Retrieval.html

Inverted Index

Inverted Index Construction PPT
http://www.2shared.com/file/GvEvb0aa/Inverted_index.html
The Database diagram for simple search engine is a distributed   database consist of 28 schema 
and sample from real inverted index

Preprocessing phase Tokenization and linguistics

preprocessing phase Tokenization and linguistics PPT

http://www.2shared.com/file/Is9KkUuI/Tokenization.html

Implementation of preprocessing using C# and documents that preprocessed   

http://www.2shared.com/file/-7Bt0vWC/Toknization.html

http://www.2shared.com/file/7ddEKdZ4/Documents.html

Simple Output :

Web search engine phases (phase one Web Crawling )

search engine phases and web crawling PPT


source code for web crawling in C#

Unstructured vs. structured

Structured data : information  in  fixed  schema  (database) it has data modeling  and regular data
unstructured data : refer to information does not  have data model  and  heavy text and irregular data

Search Engine

what is the search engine?
is an application to retrieve information from large collection of unstructured data and free heavy text.
Search engine types:

• Desktop search: find information on the user's PC, including web browser histories, e-mail archives, text documents, sound files, images and video.
• Enterprise search: is the practice of making content from multiple enterprise-type sources, such as databases and intranets, searchable to a defined audience.
• Federated search:is an information retrieval technology that allows the simultaneous search of multiple searchable resources
• Mobile search: is an evolving branch of information retrieval services that is centered around the convergence of mobile platform and mobile phones and other mobile devices,Simply put, mobile search is not just a spatial shift of PC web search to mobile equipment, but is witnessing more of treelike branching into specialized segments of mobile broadband and mobile content, both of which show a fast-paced evolution.
• Social search:is a type of web search that takes into account the social graph of the person initiating the search query. When applied to web search this Social-Graph approach to relevance is in contrast to established algorithmic or machine-based approaches where relevance is determined by analyzing the text of each document or the link structure of the documents. Search results produced by social search engine give more visibility to content created or touched by users in the Social Graph.
• Web search:is designed to search for information on the world wide web and FTP servers. The search results are generally presented in a list of results and are often called hits. The information may consist of web pages, images, information and other types of files

IR application

Search Engine
Information Filtering
Digital libraries
Media Search

what is the IR?

IR: is finding material result from unstructured nature that satisfies the information need from large collections

The Information Retrieval System Structure