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By | April 2013
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CHAPTER 1

INTRODUCTION

1 Introduction

Traditional Information Retrieval systems do not perform well in satisfying temporal users’ information needs. Those systems tend to provide a list of search results according to the topical relevance score of each document to the user query. The main limitation of these systems is that they rely only on the query keywords to represent the user information need. Time-based Information Retrieval [1] has emerged as a popular research area due to the increase of temporal information needs where the user looks for information related to events. In information retrieval, one of the main problems is to retrieve a set of documents that is related to a given user query.

After determining the time preferences behind the query, the system re ranks the search results using uncertainty-ignorant or uncertainty-aware ranking model that matches the document creation date to the query time. Web search engines provide an efficient interface to this vast information. The methods involved are supported by the different searches to extract the documents. The normal search verifies the files names with the require search content and the deep search verifies the content of the each document to retrieve files. Both these searches support the methods of temporal ranking algorithm.

For example, a word which was included in a document before modifying often is not included in a document after modifying. Therefore, time-varying information must be retrieved with the time specified. This is quite natural and such temporal information retrieval is available for digital libraries. The Temporal ranking is required to list the documents by the time and date of last modified. The pages extracted are ranked by the frequency of the words searched from the documents.

Temporal document ranking [2] is based on calculating a temporal document score by combining term...

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