By R. and Lyons, J.L. (eds), Glowinski

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Propositional content. It indicates the contents of the illocutionary act. These four criteria allowed Searle to distinguish five main types of illocutionary acts, namely assertive (assertion, information), directive (command, request, question, permission, injunction), promissive (promise, offers), expressive (congratulation, excuse, thanks, complaint, greeting) and declarative (declaration, judgment). In the following, we briefly introduce the logic of the language acts. It enables the construction of a formal semantics for spoken natural language.

Based on the work of Luzzati (1995), the interactional analyzer ensures a co-operative behavior of the system. The intentional analyzer determines the language act that is related to the user utterance. Based on the Geneva model, the analyzer uses a hierarchical and functional dialog model. 4 presents the STANDIA dialog model with the following units: dialog (D), exchange (E), initiative (I); in E I I I, the first I yields the role of initiative, the second a reactive role and the third an evaluating role, 40 SPEECH AND HUMAN-MACHINE DIALOG simple intervention (SI), composed intervention (CI), language act (LA).

The aim of VODIS II has been to modify the syntactic constraints and the dialog type as a function of the speech recognition quality. Syntax (out of context) is defined in the form of uncompiled rules. Depending on the context, the system activates or deactivates the rules. The recognition process including syntactic constraints generates a lattice which is analyzed. The syntactic constraints are obtained using a semantic context-free grammar. , 1990b). Different knowledge sources, including the vocabulary, the syntax, the task model, the user model and the dialog history, are used during the dialog.

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