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Author: Stefan Burkhardt
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Stefan Burkhardt
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Heikki Hyyrö
Publisher:
ISBN: 9789514458187
Category : Information retrieval
Languages : en
Pages : 105
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Abstract: "Given a pattern string and a text, the task of approximate string matching is to find all locations in the text that are similar to the pattern. This type of search may be done for example in applications of spelling error correction or bioinformatics. Typically edit distance is used as the measure of similarity (or distance) between two strings. In this thesis we concentrate on unit-cost edit distance that defines the distance between two strings as the minimum number of edit operations that are needed in transforming one of the strings into the other. More specifically, we discuss the Levenshtein and the Damerau edit distances. Aproximate [sic] string matching algorithms can be divided into off-line and on-line algorithms depending on whether they may or may not, respectively, preprocess the text. In this thesis we propose practical algorithms for both types of approximate string matching as well as for computing edit distance. Our main contributions are a new variant of the bit-parallel approximate string matching algorithm of Myers, a method that makes it easy to modify many existing Levenshtein edit distance algorithms into using the Damerau edit distance, a bit-parallel algorithm for computing edit distance, a more error tolerant version of the ABNDM algorithm, a two-phase filtering scheme, a tuned indexed approximate string matching method for genome searching, and an improved and extended version of the hybrid index of Navarro and Baeza-Yates. To evaluate their practicality, we compare most of the proposed methods with previously existing algorithms. The test results support the claim of the title of this thesis that our proposed algorithms work well in practice."
Author: Marios Hadjieleftheriou
Publisher: Now Publishers Inc
ISBN: 1601984189
Category : Computers
Languages : en
Pages : 151
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Book Description
Focuses on the problem of approximate string matching and surveys indexing techniques and algorithms specifically designed for this purpose. It concentrates on inverted indexes, filtering techniques, and tree data structures that can be used to evaluate a variety of set based and edit based similarity functions.
Author: Gonzalo Navarro
Publisher: Cambridge University Press
ISBN: 9780521813075
Category : Computers
Languages : en
Pages : 236
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Book Description
Presents recently developed algorithms for searching for simple, multiple and extended strings, regular expressions, exact and approximate matches.
Author: Ricardo Baeza-Yates
Publisher: McGill-Queen's Press - MQUP
ISBN: 0773591400
Category : Science
Languages : en
Pages : 206
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Book Description
We use string processing to denote any use of computers to process and manage strings or sequences of symbols. This includes text retrieval, compression, computational biology, natural language processing, word theory, etc. Strings can also be extended to other dimensions, including images and complex objects, such as trees or graphs. These areas are important for many applications, including text, image or genetic databases. Nowadays, the most important motivation for research is searching and managing the World Wide Web. The Web contains terabytes of data and searching for information is becoming as difficult as finding a needle in a haystack. Future versions of this work-shop will focus on generic information retrieval, query languages, user interfaces and visualization tools.
Author: Ruay-Shiung Chang
Publisher: Springer Science & Business Media
ISBN: 3642354521
Category : Technology & Engineering
Languages : en
Pages : 721
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Book Description
The field of Intelligent Systems and Applications has expanded enormously during the last two decades. Theoretical and practical results in this area are growing rapidly due to many successful applications and new theories derived from many diverse problems. This book is dedicated to the Intelligent Systems and Applications in many different aspects. In particular, this book is to provide highlights of the current research in Intelligent Systems and Applications. It consists of research papers in the following specific topics: l Graph Theory and Algorithms l Interconnection Networks and Combinatorial Algorithms l Artificial Intelligence and Fuzzy Systems l Database, Data Mining, and Information Retrieval l Information Literacy, e-Learning, and Social Media l Computer Networks and Web Service/Technologies l Wireless Sensor Networks l Wireless Network Protocols l Wireless Data Processing This book provides a reference to theoretical problems as well as practical solutions and applications for the state-of-the-art results in Intelligent Systems and Applications on the aforementioned topics. In particular, both the academic community (graduate students, post-doctors and faculties) in Electrical Engineering, Computer Science, and Applied Mathematics; and the industrial community (engineers, engineering managers, programmers, research lab staffs and managers, security managers) will find this book interesting.
Author: Esko Ukkonen
Publisher:
ISBN: 9789514530791
Category :
Languages : en
Pages :
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Author: Paolo Ferragina
Publisher: Springer Science & Business Media
ISBN: 3540690662
Category : Computers
Languages : en
Pages : 327
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Book Description
This book constitutes the refereed proceedings of the 19th Annual Symposium on Combinatorial Pattern Matching, CPM 2008, held in Pisa, Italy, in June 2008. The 25 revised full papers presented together with 3 invited talks were carefully reviewed and selected from 78 submissions. The papers address all areas related to combinatorial pattern matching and its applications, such as coding and data compression, computational biology, data mining, information retrieval, natural language processing, pattern recognition, string algorithms, string processing in databases, symbolic computing and text searching.
Author: Ricardo Baeza-Yates
Publisher: Springer
ISBN: 3540448888
Category : Mathematics
Languages : en
Pages : 412
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Book Description
The refereed proceedings of the 14th Annual Symposium on Combinatorial Pattern Matching, CPM 2003, held in Morelia, Michoacán, Mexico in June 2003. The 28 revised full papers presented were carefully reviewed and selected from 57 submissions. The papers are devoted to current theoretical and computational aspects of searching and matching strings and more complicated patterns, such as trees, regular expressions, graphs, point sets, and arrays. Among the application fields addressed are computational biology, bioinformatics, genomics, the Web, data compression, coding, multimedia, information retrieval, pattern recognition, and computer vision.
Author: Petteri Jokinen
Publisher:
ISBN: 9789514559761
Category : Pattern recognition systems
Languages : en
Pages : 22
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Abstract: "Experimental comparison of the running time of approximate string matching algorithms for the k differences problem is presented. Given a pattern string, a text string and an integer k, the task is to find all approximate occurrences of the pattern in the text with at most k differences (insertions, deletions, changes). Besides a new algorithm based on suffix automata, we consider six other algorithms based on different approaches including dynamic programming, Boyer-Moore string matching and the distribution of characters. It turns out that none of the algorithms is the best for all values of the problem parameters, and the speed differences between the methods can be large."
