Publications
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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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Innovation In Urban School Settings: Integrating Contexts And Tools In Support Of Learning
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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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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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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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Transformation And Transition: Education For The 21st Century
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Hybrid Planning: An Approach to Integrating Generative and Case-Based Planning
This paper describes ongoing research on the development of a hybrid planning system that integrates case-based reasoning (CBR) methods into SIPE-2, a generative planning system.
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Towards a Framework for Continuous Planning and Execution
This paper reports on the first phase of the Continuous Planning and Execution Framework (CPEF), a system that employs sophisticated plan generation, execution, monitoring, and repair capabilities to solve complex…
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Connecting With The Twenty-First Century: Technology In Support Of Educational Reform
We present an alternative image of what schools might be like and a set of interlocking social, pedagogical and technological changes that could transform the educational enterprise.
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EcoCyc: Electronic Encyclopedia of E. coli Genes and Metabolism