TAILIEUCHUNG - Báo cáo khoa học: "SOME FACTS ABOUT CENTERS, INDEXICALS, AND DEMONSTRATIVES"

identified. In contrast, the referents of indexicals such as I and you (., the speaker and addressee) are necessary components of the discourse circumstances. 2 Indexical pronouns can be further classified into pure indexicals versus demonstratives, 8 depending on how the current discourse circumstances provide their referents. The referent of a pure indexical is fully determined by the semantic rules and a context, which together pick out a unique referent for each use. Thus I refers to the person who utters it (assuming that I is used to refer). A pure indexical cannot refer to alternative entities, nor can. | SOME FACTS ABOUT CENTERS INDEXICALS AND DEMONSTRATIVES Rebecca J. Passonneau Columbia University 450 Computer Science Bldg. New York New York 10027 becky@ ABSTRACT1 Certain pronoun contexts are argued to establish a local center LC . a conventionalized indexical similar to lst 2nd pers. pronouns. Demonstrative pronouns also indexicals are shown to access entities that are not LCs because they lack discourse relevance or because they are not yet in the universe of discourse. 1 Introduction Referring expressions in discourse are multifunctional and dual-faced. Besides functioning to specify referents they also indicate the status of their referents in the evolving discourse model such as the informational status of being given or new Pri81 or maintain the attentional status of being in focus Sid83 Gro77 . They are dual-faced in that the surface form of a referring expression is constrained by the prior discourse context and then increments the context serving to constrain subsequent utterances Isa75 . As a consequence of this latter property the communicative effect of many referring forms especially pronouns is relative to specific types of discourse contexts. The discourse reference functions of a few types of pronouns are examined taking into account their multifunctionality and their dual nature in order to clarify their processing requirements in dialogic natural language systems. In particular a comparison of the conversational usage of it with two types of indexical pronouns indicates that certain uses of it referred to as local centering resemble what Kaplan Kap89 refers to as pure indexicals. Several functions of that are also identified and shown to contrast with local centering with respect to their preconditions and effects. Third person definite 3d pronouns contrast with indexical pronouns because the referents of the former are arbitrary and must be actively established as part of the current universe of discourse in order for .

• Báo cáo khoa học
• SOME FACTS ABOUT CENTERS
• INDEXICALS
• DEMONSTRATIVES
• Rebecca J
• Passonneau
• báo cáo khoa học
• mô hình ngôn ngữ
• xử lý ngôn ngữ tự nhiên
• Bài giảng Xử lý ngôn ngữ tự nhiên
• Ngôn ngữ tự nhiên
• Kỹ thuật lập trình
• Xử lý nhập nhằng ngữ nghĩa
• Xử lý ngữ nghĩa
• Xử lý ngôn ngữ
• Natural Language Processing
• Ngôn ngữ lập trình
• Nhập nhằng cấu trúc
• Tri thức về ngôn ngữ
• Mô hình n gram
• Dịch máy
• Phương pháp dịch máy
• Hiểu ngôn ngữ
• Phân tích ngữ nghĩa
• Phân loại tin tự động
• Biểu diễn vị từ
• Thuộc tính về sự kiện
• Thuộc tính về sự kiện
• Mô hình ngôn ngữ Google Book N grams
• Mô hình ngôn ngữ KenLM
• Phương pháp làm mịn
• Tách từ tiếng Việt
• Gán nhãn từ loại
• Phân tích cú pháp
• Nghĩa từ vựng
• Phân giải nhập nhằng từ
• Phân loại văn bản
• Lexical chain
• Phản hồi thông tin
• Bài toán PTCP
• Cấu trúc ngữ pháp
• Phân tích cú pháp xác suất
• CKY kết hợp xác suất
• Văn phạm phi ngữ cảnh xác suất
• Hình thái học