Publications
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Plywood Walls And Exposed Pipes: Supporting A Culture Of Learning In An On-Line Teacher Professional Development Community
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Nonlinear Discriminant Feature Extraction for Robust Text-Independent Speaker Recognition
We study a nonlinear discriminant analysis (NLDA) technique that extracts a speaker-discriminant feature set. Our approach is to train a multilayer perceptron (MLP) to maximize the separation between speakers by…
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Dialog Act Modeling for Conversational Speech
We describe an integrated approach for statistical modeling of discourse structure for natural conversational speech. Our model is based on 42 `dialog acts', which were hand-labeled in 1155 conversations from…
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Speech Technology and Language Learning: Some Examples from VILTS, the Voice Interactive Language Training System
In this paper we describe the development of the Voice Interactive Language Training System (VILTS) and our experience in exploring the potential of speech technology in service to language learning.
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Entropy-based Pruning of Backoff Language Models
A criterion for pruning parameters from N-gram backoff language models is developed, based on the relative entropy between the original and the pruned model. It is shown that the relative…
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The Development of SRI’s 1997 Broadcast News Transcription System
This paper describes SRI's 1997 broadcast news transcription system used for the 1997 DARPA H4 evaluations. Our system had several novel components. We briefly describe these features and give comparative…
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New Developments in Lattice-Based Search Strategies in SRI’s Hub4 System
We describe new developments in SRI's lattice-based progressive search strategy. These developments include the implementation of a new bigram lattice algorithm, lattice optimization techniques, and expansion of bigram lattices to…
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Counselor Simulation Guide, Levels 1-3
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Reasoning about Locations in Theory and Practice
This paper addresses both theoretical and practical issues relevant to reasoning about locations. Techniques for the efficient operationalization of the belief revision rules in planning frameworks are presented.
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Scalable Integration Of Educational Software: Exploring The Promise Of Component Architectures
We describe an exploratory effort in which four research groups produced software components for the mathematics of motion.
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Coordinating Planning Activity and Information Flow in a Distributed Planning System
Distributed SIPE (DSIPE) is a distributed planning system that provides decision support to human planners in a collaborative planning environment.
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The Mathematics Of Change And Variation From A Millennial Perspective: New Content, New Context
We shall examine large-scale trends in content changes and in context changes for learning and using mathematics. From this set of factors, we raise three questions.