Document (#31988)

Author
Marcus, S.
Title
Textvergleich mit mehreren Mustern
Imprint
Münster : Institut für Wirtschaftsinformatik der Westfälische Wilhelms-Universität Münster
Year
2005
Pages
25 S
Abstract
Das Gebiet des Pattern-Matching besitzt in vielen wissenschaftlichen Bereichen eine hohe Relevanz. Aufgrund unterschiedlicher Einsatzgebiete sind auch Umsetzung und Anwendung des Pattern-Matching sehr verschieden. Die allen Anwendungen des Pattern-Matching inhärente Aufgabe besteht darin, in einer Vielzahl von Eingabedaten bestimmte Muster wieder zu erkennen. Dies ist auch der deutschen Bezeichnung Mustererkennung zu entnehmen. In der Medizin findet Pattern-Matching zum Beispiel bei der Untersuchung von Chromosomensträngen auf bestimmte Folgen von Chromosomen Verwendung. Auf dem Gebiet der Bildverarbeitung können mit Hilfe des Pattern-Matching ganze Bilder verglichen oder einzelne Bildpunkte betrachtet werden, die durch ein Muster identifizierbar sind. Ein weiteres Einsatzgebiet des Pattern-Matching ist das Information-Retrieval, bei dem in gespeicherten Daten nach relevanten Informationen gesucht wird. Die Relevanz der zu suchenden Daten wird auch hier anhand eines Musters, zum Beispiel einem bestimmten Schlagwort, beurteilt. Ein vergleichbares Verfahren findet auch im Internet Anwendung. Internet-Benutzer, die mittels einer Suchmaschine nach bedeutsamen Informationen suchen, erhalten diese durch den Einsatz eines Pattern-Matching-Automaten. Die in diesem Zusammenhang an den Pattern-Matching-Automaten gestellten Anforderungen variieren mit der Suchanfrage, die an eine Suchmaschine gestellt wird. Eine solche Suchanfrage kann im einfachsten Fall aus genau einem Schlüsselwort bestehen. Im komplexeren Fall enthält die Anfrage mehrere Schlüsselwörter. Dabei muss für eine erfolgreiche Suche eine Konkatenation der in der Anfrage enthaltenen Wörter erfolgen. Zu Beginn dieser Arbeit wird in Kapitel 2 eine umfassende Einführung in die Thematik des Textvergleichs gegeben, wobei die Definition einiger grundlegender Begriffe vorgenommen wird. Anschließend werden in Kapitel 3 Verfahren zum Textvergleich mit mehreren Mustern vorgestellt. Dabei wird zunächst ein einfaches Vorgehen erläutert, um einen Einsteig in das Thema des Textvergleichs mit mehreren Mustern zu erleichtern. Danach wird eine komplexe Methode des Textvergleichs vorgestellt und anhand von Beispielen verdeutlicht.
Content
Ausarbeitung im Rahmen des Seminars Suchmaschinen und Suchalgorithmen, Institut für Wirtschaftsinformatik Praktische Informatik in der Wirtschaft, Westfälische Wilhelms-Universität Münster. - Vgl.: http://www-wi.uni-muenster.de/pi/lehre/ss05/seminarSuchen/Ausarbeitungen/SandraMarcus.pdf
Theme
Retrievalalgorithmen
Object
Knuth-Morris-Pratt-Algorithmus
Aho-Corasick-Algorithmus
Keyword-trees

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