This paper describes recent work on the Unisys ATIS Spoken Language System, and reports benchmark results on natural language, spoken language, and speech recognition. We describe enhancements to the system's semantic processing for handling non-transparent argument structure and enhancements to the system's pragmatic processing of material in answers displayed to the user. We found that the system's score on the natural language benchmark test decreased from 48% to 36% without ...
The Unisys MUC-3 system is based on a three-tiered approach to text processing in which a novel an d quite powerful knowledge-based form of information retrieval plays a central role. The main components of this approach are as follows : 1. A Keyword-Based Information Retrieval Component - This component predicts the occurrence of types of events in texts based on the presence of key words and phrases. 2. A Knowledge-Based ...
Recent theories of focusing and reference rely crucially on discourse structure to constrain the availability of discourse entities for reference, but deriving the structure of an arbitrary discourse has proved to be a significant problem. A useful level of problem reduction may be achieved by analyzing discourse in which the structure is explicit, rather than implicit. In this paper we consider a genre of explicitly-structured discourse: the Trouble and Failure ...
This paper describes issues in adapting the PUNDIT system, designed originally for message processing, to a query-answering system for the VOYAGER application. The resulting system, whose architecture and capabilities are described here, represents a first step towards our goal of demonstrating spoken language understanding in an interactive problem-solving context.
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