TAILIEUCHUNG - Báo cáo khoa học: "KNOWLEDGE ENGINEERING APPROACH TO MORPHOLOGICAL ANALYSIS"

Finnish is a highly inflectional language. A verb can have over ten thousand different surface forms - nominals slightly fewer. Consequently, a morphological analyzer is an important component of a system aiming at "understanding" Finnish. This paper briefly describes our rule-based heuristic analyzer for Finnish nominal and verb forms. Our tests have shown it to be quite efficient: the analysis of a Finnish word in a running text takes an average of 15 ms of DEC 20 CPU-time. I INTRODUCTION This paper briefly discusses the application of rule-based systems to the morphological analysis of Finnish word forms. Production systems. | KNOWLEDGE ENGINEERING APPROACH TO MORPHOLOGICAL ANALYSIS Harri JSppinen Aarno Lehtola Esa Nelimarkka and Matti Ylilammi Helsinki University of Technology Helsinki Finland ABSTRACT Finnish is a highly inflectional language. A verb can have over ten thousand different surface forms - nominals slightly fewer. Consequently a morphological analyzer is an important component of a system aiming at understanding Finnish. This paper briefly describes our rule-based heuristic analyzer for Finnish nominal and verb forms. Our tests have shown it to be quite efficient the analysis of a Finnish word in a running text takes an average of 15 ms of DEC 20 CPU-time. I INTRODUCTION This paper briefly discusses the application of rule-based systems to the morphological analysis of Finnish word forms. Production systems seem to us a convenient way to express the strongly context-sensitive segmentation of Finnish word forms. This work demonstrates that . they can be implemented to efficiently perform segmentations and uncover their interpretations. For any computational system aiming at interpreting a highly inflectional language such as Finnish the morphological analysis of word forms is an important component. Inflectional suffixes carry syntactic and semantic information which is necessary for a syntactic and logical analysis of a sentence. In contrast to major Indo-European languages such as English where morphological analysis is often so simple that reports of systems processing these languages usually omit morphological discussion the analysis of Finnish word forms is a hard problem. A few algorithmic approaches . methods using precise and fully-informed decisions to a morphological analysis of Finnish have been reported. Brodda and Karlsson 1981 attempted to find the most probable morphological segmentation for an arbitrary Finnish surface-word form without a reference to a lexicon. They report surprisingly high success close to 90 However their system neither transforms .

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