Hans-Ulrich Krieger

Also published as: HansUlrich Krieger


2015

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Extending OWL Ontologies by Cartesian Types to Represent N-ary Relations in Natural Language
Hans-Ulrich Krieger | Christian Willms
Proceedings of the 1st Workshop on Language and Ontologies

2014

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TMO — The Federated Ontology of the TrendMiner Project
Hans-Ulrich Krieger | Thierry Declerck
Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14)

This paper describes work carried out in the European project TrendMiner which partly deals with the extraction and representation of real time information from dynamic data streams. The focus of this paper lies on the construction of an integrated ontology, TMO, the TrendMiner Ontology, that has been assembled from several independent multilingual taxonomies and ontologies which are brought together by an interface specification, expressed in OWL. Within TrendMiner, TMO serves as a common language that helps to interlink data, delivered from both symbolic and statistical components of the TrendMiner system. Very often, the extracted data is supplied as quintuples, RDF triples that are extended by two further temporal arguments, expressing the temporal extent in which an atemporal statement is true. In this paper, we will also sneak a peek on the temporal entailment rules and queries that are built into the semantic repository hosting the data and which can be used to derive useful new information.

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Information Extraction from German Patient Records via Hybrid Parsing and Relation Extraction Strategies
Hans-Ulrich Krieger | Christian Spurk | Hans Uszkoreit | Feiyu Xu | Yi Zhang | Frank Müller | Thomas Tolxdorff
Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14)

In this paper, we report on first attempts and findings to analyzing German patient records, using a hybrid parsing architecture and a combination of two relation extraction strategies. On a practical level, we are interested in the extraction of concepts and relations among those concepts, a necessary cornerstone for building medical information systems. The parsing pipeline consists of a morphological analyzer, a robust chunk parser adapted to Latin phrases used in medical diagnosis, a repair rule stage, and a probabilistic context-free parser that respects the output from the chunker. The relation extraction stage is a combination of two systems: SProUT, a shallow processor which uses hand-written rules to discover relation instances from local text units and DARE which extracts relation instances from complete sentences, using rules that are learned in a bootstrapping process, starting with semantic seeds. Two small experiments have been carried out for the parsing pipeline and the relation extraction stage.

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Harmonization of German Lexical Resources for Opinion Mining
Thierry Declerck | Hans-Ulrich Krieger
Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14)

We present on-going work on the harmonization of existing German lexical resources in the field of opinion and sentiment mining. The input of our harmonization effort consisted in four distinct lexicons of German word forms, encoded either as lemmas or as full forms, marked up with polarity features, at distinct granularity levels. We describe how the lexical resources have been mapped onto each other, generating a unique list of entries, with unified Part-of-Speech information and basic polarity features. Future work will be dedicated to the comparison of the harmonized lexicon with German corpora annotated with polarity information. We are further aiming at both linking the harmonized German lexical resources with similar resources in other languages and publishing the resulting set of lexical data in the context of the Linguistic Linked Open Data cloud.

2013

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An Efficient Typed Feature Structure Index: Theory and Implementation
Bernd Kiefer | Hans-Ulrich Krieger
Proceedings of the 13th International Conference on Parsing Technologies (IWPT 2013)

2012

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Ontology-Based Incremental Annotation of Characters in Folktales
Thierry Declerck | Nikolina Koleva | Hans-Ulrich Krieger
Proceedings of the 6th Workshop on Language Technology for Cultural Heritage, Social Sciences, and Humanities

2011

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Large-Scale Corpus-Driven PCFG Approximation of an HPSG
Yi Zhang | Hans-Ulrich Krieger
Proceedings of the 12th International Conference on Parsing Technologies

2010

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DL Meet FL: A Bidirectional Mapping between Ontologies and Linguistic Knowledge
Hans-Ulrich Krieger | Ulrich Schäfer
Coling 2010: Posters

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A General Methodology for Equipping Ontologies with Time
Hans-Ulrich Krieger
Proceedings of the Seventh International Conference on Language Resources and Evaluation (LREC'10)

In the first part of this paper, we present a framework for enriching arbitrary upper or domain-specific ontologies with a concept of time. To do so, we need the notion of a time slice. Contrary to other approaches, we directly interpret the original entities as time slices in order to (i) avoid a duplication of the original ontology and (ii) to prevent a knowledge engineer from ontology rewriting. The diachronic representation of time is complemented by a sophisticated time ontology that supports underspecification and an arbitrarily fine granularity of time. As a showcase, we describe how the time ontology has been interfaced with the PROTON upper ontology. The second part investigates a temporal extension of RDF that replaces the usual triple notation by a more general tuple representation. In this setting, Hayes/ter Horst-like entailment rules are replaced by their temporal counterparts. Our motivation to move towards this direction is twofold: firstly, extending binary relation instances with time leads to a massive proliferation of useless objects (independently of the encoding); secondly, reasoning and querying with such extended relations is extremely complex, expensive, and error-prone.

2006

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Contextual phenomena and thematic relations in database QA dialogues: results from a Wizard-of-Oz Experiment
Núria Bertomeu | Hans Uszkoreit | Anette Frank | Hans-Ulrich Krieger | Brigitte Jörg
Proceedings of the Interactive Question Answering Workshop at HLT-NAACL 2006

2004

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Resources and Techniques for Multilingual Information Extraction
Stephan Busemann | Hans-Ulrich Krieger
Proceedings of the Fourth International Conference on Language Resources and Evaluation (LREC’04)

Official travel warnings published regularly in the internet by the ministries for foreign affairs of France, Germany, and the UK provide a useful resource for assessing the risks associated with travelling to some countries. The shallow IE system SProUT has been extended to meet the specific needs of delivering a language-neutral output for English, French, or German input texts. A shared type hierarchy, a feature-enhanced gazetteer resource, and generic techniques of merging chunk analyses into larger results are major reusable results of this work.

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Ellipsis Resolution by Controlled Default Unification for Multi-modal and Speech Dialog Systems
Michael Streit | HansUlrich Krieger
Proceedings of the Conference on Reference Resolution and Its Applications

2003

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SDLA Description Language for Building NLP Systems
Hans-Ulrich Krieger
Proceedings of the HLT-NAACL 2003 Workshop on Software Engineering and Architecture of Language Technology Systems (SEALTS)

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Integrating Information Extraction and Automatic Hyperlinking
Stephan Busemann | Witold Drozdzynski | Hans-Ulrich Krieger | Jakub Piskorski | Ulrich Schaefer | Hans Uszkoreit | Feiyu Xu
The Companion Volume to the Proceedings of 41st Annual Meeting of the Association for Computational Linguistics

2002

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An Integrated Archictecture for Shallow and Deep Processing
Berthold Crysmann | Anette Frank | Bernd Kiefer | Stefan Mueller | Guenter Neumann | Jakub Piskorski | Ulrich Schaefer | Melanie Siegel | Hans Uszkoreit | Feiyu Xu | Markus Becker | Hans-Ulrich Krieger
Proceedings of the 40th Annual Meeting of the Association for Computational Linguistics

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A Novel Disambiguation Method for Unification-Based Grammars Using Probabilistic Context-Free Approximations
Bernd Kiefer | Hans-Ulrich Krieger | Detlef Prescher
COLING 2002: The 19th International Conference on Computational Linguistics

2000

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An HPSG-to-CFG Approximation of Japanese
Bernd Kiefer | Hans-Ulrich Krieger | Melanie Siegel
COLING 2000 Volume 2: The 18th International Conference on Computational Linguistics

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A Context-free Approximation of Head-driven Phrase Structure Grammar
Bernd Kiefer | Hans-Ulrich Krieger
Proceedings of the Sixth International Workshop on Parsing Technologies

We present a context-free approximation of unification-based grammars, such as HPSG or PATR-II. The theoretical underpinning is established through a least fixpoint construction over a certain monotonic function. In order to reach a finite fixpoint, the concrete implementation can be parameterized in several ways , either by specifying a finite iteration depth, by using different restrictors, or by making the symbols of the CFG more complex adding annotations a la GPSG. We also present several methods that speed up the approximation process and help to limit the size of the resulting CF grammar.

1999

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A Bag of Useful Techniques for Efficient and Robust Parsing
Bernd Kiefer | Hans-Ulrich Krieger | John Carroll | Rob Malouf
Proceedings of the 37th Annual Meeting of the Association for Computational Linguistics

1996

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Modularizing Codescriptive Grammars for Efficient Parsing
Walter Kasper | Hans-Ulrich Krieger
COLING 1996 Volume 2: The 16th International Conference on Computational Linguistics

1995

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Distributed Parsing With HPSG Grammars
Abdel Kader Diagne | Walter Kasper | Hans-Ulrich Krieger
Proceedings of the Fourth International Workshop on Parsing Technologies

1994

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DISCO-An HPSG-based NLP System and its Application for Appointment Scheduling Project Note
Hans Uszkoreit | Rolf Backofen | Stephan Busemann | Abdel Kader Diagne | Elizabeth A. Hinkelman | Walter Kasper | Bernd Kiefer | Hans-Ulrich Krieger | Klaus Netter | Gunter Neumann | Stephan Oepen | Stephen P. Spackman
COLING 1994 Volume 1: The 15th International Conference on Computational Linguistics

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TDL-A Type Description Language for Constraint-Based Grammars
Hans-Ulrich Krieger | Ulrich Schafer
COLING 1994 Volume 2: The 15th International Conference on Computational Linguistics

1993

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Typed feature formalisms as a common basis for linguistic specification
Hans-Ulrich Krieger
Third International EAMT Workshop: Machine Translation and the Lexicon

Typed feature formalisms (TFF) play an increasingly important role in NLP and, in particular, in MT. Many of these systems are inspired by Pollard and Sag’s work on Head-Driven Phrase Structure Grammar (HPSG), which has shown that a great deal of syntax and semantics can be neatly encoded within TFF. However, syntax and semantics are not the only areas in which TFF can be beneficially employed. In this paper, I will show that TFF can also be used as a means to model finite automata (FA) and to perform certain types of logical inferencing. In particular, I will (i) describe how FA can be defined and processed within TFF and (ii) propose a conservative extension to HPSG, which allows for a restricted form of semantic processing within TFF, so that the construction of syntax and semantics can be intertwined with the simplification of the logical form of an utterance. The approach which I propose provides a uniform, HPSG-oriented framework for different levels of linguistic processing, including allomorphy and morphotactics, syntax, semantics, and logical form simplification.

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Feature-Based Allomorphy
Hans-Ulrich Krieger | Hannes Pirker
31st Annual Meeting of the Association for Computational Linguistics