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Automatic Construction of a Concept Hierarchy from Coordinated Noun Phrases
노용균 한국언어정보학회 2007 언어와 정보 Vol.11 No.1
Noun phrase coordination is an extremely productive phenomenon. Based on an observation that conjuncts tend to denote semantically related concepts, we collect four hundred thousand pairs of conjuncts from the British National Corpus, in an attempt to build an is-a hierarchy of English noun concepts. The modifiedness patterns of the two words in these pairs point to three distinct semantic relations: sibling, cousin, and ancestor-or-ancestor`s-sibling. The process of finding them and how these pairs are used to motivate groups of quasi-synonyms and then to locate the hypernyms are discussed.
Nominative/Accusative Adpositions in Ngative Auxiliary Constructions
노용균 한국언어정보학회 2004 언어와 정보 Vol.8 No.2
Language and Information 8.2 , 73–91. The nominative and accusative postpositions in Korean may intervene between the negative auxiliary verb anh and its complement verb phrase. As Korean is an OV language, this means that “verb + {nom, acc} + anh” as well as the simpler concatenation “verb + anh” is possible. This fact, together with an overwhelming regularity of these postpositions’ optionality in virtually all constructions, poses a problem for formal approaches to the syntax of the language. Working in a constraint-based grammatical framework shaped by such works as Sag and Wasow (1999) and Copestake (2002), we put forth type hierarchies for major class, which represents verb inflection, and for pos, which has two immediate subtypes, i.e., htrp pos and ord pos. What we call the “halftransparency” of the case postpositions separates them from all the other lexical items in the language. The type htrp pos is used to constrain one of the two newly proposed head comp rules, where a newly proposed feature head2 of a phrase inherits its value from the head feature of the head word. The comps list of the negative auxiliary anh is seen as containing a single phrase whose head is a kind of nominal clause and whose head2 is something that is one of the three maximal types: acc, nom, and null.