Nikos Chatzichrisafis


2008

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A Knowledge-Modeling Approach for Multilingual Regulus Lexica
Marianne Santaholma | Nikos Chatzichrisafis
Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)

Development of lexical resources is, along with grammar development, one of the main efforts when building multilingual NLP applications. In this paper, we present a tool-based approach for more efficient manual lexicon development for a spoken language translation system. The approach in particular addresses the common problems of multilingual lexica including the redundancy of encoded information and inconsistency of lexica of different languages. The general benefits of this practical tool-based approach are clear and user-friendly lexicon structure, inheritance of information inside of a language and between different system languages, and transparency and consistency of coverage between system languages. The visual tool-based approach is user-friendly to linguistic informants that don’t have previous experience of lexicon development, while at the same time, it still is a powerful tool for expert system developers.

2007

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A Bidirectional Grammar-Based Medical Speech Translator
Pierrette Bouillon | Glenn Flores | Marianne Starlander | Nikos Chatzichrisafis | Marianne Santaholma | Nikos Tsourakis | Manny Rayner | Beth Ann Hockey
Proceedings of the Workshop on Grammar-Based Approaches to Spoken Language Processing

2006

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REGULUS: A Generic Multilingual Open Source Platform for Grammar-Based Speech Applications
Manny Rayner | Pierrette Bouillon | Beth Ann Hockey | Nikos Chatzichrisafis
Proceedings of the Fifth International Conference on Language Resources and Evaluation (LREC’06)

We present an overview of Regulus, an Open Source platform that supports corpus-based derivation of efficient domain-specific speech recognisers from general linguistically motivated unification grammars. We list available Open Source resources, which include compilers, resource grammars for various languages, documentation and a development environment. The greater part of the paper presents a series of experiments carried out using a medium-vocabulary medical speech translation application and a corpus of 801 recorded domain utterances, designed to investigate the impact on speech understanding performance of vocabulary size, grammatical coverage, presence or absence of various linguistic features, degree of generality of thegrammar and use or otherwise of probabilistic weighting in the CFGlanguage model. In terms of task accuracy, the most significant factors were the use of probabilistic weighting, the degree of generality of the grammar and the inclusion of features which model sortal restrictions.

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Evaluating Task Performance for a Unidirectional Controlled Language Medical Speech Translation System
Nikos Chatzichrisafis | Pierrette Bouillon | Manny Rayner | Marianne Santaholma | Marianne Starlander | Beth Ann Hockey
Proceedings of the First International Workshop on Medical Speech Translation

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MedSLT: A Limited-Domain Unidirectional Grammar-Based Medical Speech Translator
Manny Rayner | Pierrette Bouillon | Nikos Chatzichrisafis | Marianne Santaholma | Marianne Starlander | Beth Ann Hockey | Yukie Nakao | Hitoshi Isahara | Kyoko Kanzaki
Proceedings of the First International Workshop on Medical Speech Translation

2005

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A generic multi-lingual open source platform for limited-domain medical speech translation
Pierrette Bouillon | Manny Rayner | Nikos Chatzichrisafis | Beth Ann Hockey | Marianne Santaholma | Marianne Starlander | Yukie Nakao | Kyoko Kanzaki | Hitoshi Isahara
Proceedings of the 10th EAMT Conference: Practical applications of machine translation

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Japanese Speech Understanding using Grammar Specialization
Manny Rayner | Nikos Chatzichrisafis | Pierrette Bouillon | Yukie Nakao | Hitoshi Isahara | Kyoko Kanzaki | Beth Ann Hockey | Marianne Santaholma | Marianne Starlander
Proceedings of HLT/EMNLP 2005 Interactive Demonstrations

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A Voice Enabled Procedure Browser for the International Space Station
Manny Rayner | Beth A. Hockey | Nikos Chatzichrisafis | Kim Farrell | Jean-Michel Renders
Proceedings of the ACL Interactive Poster and Demonstration Sessions