NDLI: Signature file hashing using term occurrence and query frequencies

Content Provider	IEEE Xplore Digital Library
Author	Aktug, D. Can, F.
Copyright Year	1993
Description	Author affiliation: Dept. of Syst. Anal., Miami Univ., Oxford, OH, USA (Aktug, D.; Can, F.)
Abstract	Signature files act as a filter on retrieval to discard a large number of nonqualifying data items. Linear hashing with superimposed signatures (LHSS) provides an effective retrieval filter to process queries in dynamic databases. This study is an analysis of the effects of reflecting the term occurrence and query frequencies to signatures in LHSS. This approach relaxes the unrealistic uniform frequency assumption and lets the terms with high discriminatory power set more bits in signatures. The simulation experiments based on the derived formulas explore the amount of page savings with different occurrence and query frequency combinations at different hashing levels. The results show that the performance of LHSS improves with the hashing level and the larger the difference between the term discriminatory power values of the terms, the higher the retrieval efficiency. The authors also discuss the benefits of this approach to alleviate the imbalance between the levels of efficiency and relevancy in the unrealistic uniform frequency assumption case.<>
Starting Page	148
Ending Page	153
File Size	582118
Page Count	6
File Format	PDF
ISBN	0780309227
DOI	10.1109/PCCC.1993.344471
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-03-23
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Information retrieval Databases Nonlinear filters
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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