tailieunhanh - Báo cáo khoa học: "INIGATION OF PROCESSING STRATEGIES FOR THE STRUCTURAL ANALYSIS OF ARGOMF"

This paper outlines research on processing strategies being developed for a language understanding systerN, designed to interpret the structure of arguments. For the system, arguments are viewed as trees, with claims as fathers to their evidence. Then understanding becomes a problem of developing a representative argtmlent tree, by locating each proposition of the argument at its appropriate place. | INVESTIGATION OF PROCESSING STRATEGIES FOR THE STRUCTURAL ANALYSIS OF ARGUMENTS Robin Cohen Department of Computer Science University of Toronto Toronto Canada M5S 1A7 ABSTRACT This paper outlines research on processing strategies being developed for a language understanding system designed to interpret the structure of arguments. For the system argunents are viewed as trees with claims as fathers to their evidence. Then understanding becomes a problem of developing a representative argument tree by locating each proposition of the argument at its appropriate place. The processing strategies we develop for the hearer are based on expectations that the speaker will use particular coherent transmission strategies and are designed to be fairly efficient work in linear time . We also comment on the use by the speaker of linguistic clues to indicate structure illustrating how the hearer can interpret the clues to limit his processing search and thus improve the complexity of the understanding process. 1. BACKGROUND This paper focuses on one aspect of an argument understanding system currently being designed. An overview of the initial design for the system can be found in Cohen 80 . In general we are examining one-sided arguments where the speaker S tries to convince the hearer H of a particular point of view. We then concentrate on the analysis problem of determining the overall structure of the argument. Considering an argument as a series of propositions the structure is indicated by isolating those propositions which serve as CLAIMS and those which serve as EVIDENCE for a particular claim and by indicating how each piece of evidence supports its associated claim. A proposition E is established as evidence for a proposition c if they fit appropriate slots in one of the system frames representing various logical rules of inference such that E is a premise to c s conclusion. For example E will be evidence for c according to modus ponens if E c is true. Establishing .