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Practical natural language interfaces must exhibit robust behaviour in the presence of extragrammatical user input. This paper classifies different types of grammatical deviations and related phenomena at the lexical, sentential and dialogue levels and presents recovery strategies tailored to specific phenomena in the classification. Such strategies(More)
The Construe news story categorization system assigns indexing terms to news stories according to their content using knowledge-based techniques. An initial deployment of Construe in Reuters Ltd. topic identification system (TIS) has replaced human indexing for Reuters Country Reports, an online information service based on news stories indexed by country(More)
While complete understanding of arbitrary input text remains in the future, it is currently possible to construct natural language processing systems that provide a partial understanding of text with limited accuracy. Moreover, such systems can provide cost-effective solutions to commercially-significant business problems. This paper describes one such(More)
Currently available interactive command interfaces often fail to provide adequate error correction or on-line help facilities, leading to the perception of an unfriendly interface and consequent frustration and reduced productivity on the part of the user. The COUSIN project of Carnegie-Mellon University is developing command interfaces which appear more(More)
A knowledge representation system is presented , based on the use of a semantic net on which a higher level structure of frames has been superimposed. The system was designed for use with a natural language system for finding the correct senses of ambiguous words in context. An examination of several linguistic examples shows how the representation system(More)
f An entity-oriented approach to restricted-domain parsing is proposed, In this approach, the definitions of the structure and surface representation of domain entities are grouped together. Like semantic grammar, this allows easy exploitation of limited dolnain semantics. In addition, it facilitates fragmentary recognition and the use of multiple parsing(More)
User interface management systems (UIMSs) provide user interfaces to application systems based on an abstract definition of the interface required. This approach can provide higher-quality interfaces at a lower construction cost. In this paper we consider three design choices for UIMSs which critically affect the quality of the user interfaces built with a(More)
Intranasal administration of an inoculum of 10(7) focus-forming units (FFU) of respiratory syncytial (RS) virus induced disease in BALB/c mice with signs of anorexia, cachexia, ruffled fur, and pneumonia. Mice displayed mild signs of illness on day 1 postinoculation (PI), followed by a transient recovery phase of 3 days. Disease rapidly reappeared on day 5(More)