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Auflistung nach Autor:in "Waltinger, Ulli"

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  • Zeitschriftenartikel
    Connecting Question Answering and Conversational Agents
    (KI - Künstliche Intelligenz: Vol. 26, No. 4, 2012) Waltinger, Ulli; Breuing, Alexa; Wachsmuth, Ipke
    Research results in the field of Question Answering (QA) have shown that the classification of natural language questions significantly contributes to the accuracy of the generated answers. In this paper we present an approach which extends the prevalent question classification techniques by additionally considering further contextual information provided by the questions. Thereby we focus on improving the conversational abilities of existing interactive interfaces by enhancing their underlying QA systems in terms of response time and correctness. As a result, we are able to introduce a method based on a tripartite contextualization. First, we present a comprehensive question classification experiment based on machine learning using two different datasets and various feature sets for the German language. Second, we propose a method for detecting the focus chunk of a given question, that is, for identifying which part of the question is fundamentally relevant to the answer and which part refers to a specification of it. Third, we investigate how to identify and label the topic of a given question by means of a human-judgment experiment. We show that the resulting contextualization method contributes to an improvement of existing question answering systems and enhances their application within interactive scenarios.
  • Konferenzbeitrag
    Time series of linguistic networks in the patrologia latina
    (INFORMATIK 2010. Service Science – Neue Perspektiven für die Informatik. Band 2, 2010) Mehler, Alexander; Gleim, Rüdiger; Waltinger, Ulli; Diewald, Nils
    We analyze a corpus of historical texts in terms of complex network theory. This is done by means of the Patrologia Latina, a collection of Latin documents that were written over a period of more than 1,000 years. We perform a lemmatization of this corpus and map its documents onto the end of the productive period of the corresponding authors. By means of this temporal ordering, we perform a transitivity analysis on the level of lexemes and sentences as a function of time. This analysis shows a remarkable law-like behavior of transitivity on the lexical and sentential level.