Joseph Polifroni

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In early 1997, our group initiated a project to develop JUPITER, a conversational interface that allows users to obtain worldwide weather forecast information over the telephone using spoken dialogue. It has served as the primary research platform for our group on many issues related to human language technology, including telephone-based speech(More)
In this paper we present an approach to recognition confidence scoring and a method for integrating confidence scores into the understanding and dialogue components of a speech understanding system. The system uses a multi-tiered approach where confidence scores are computed at the phonetic, word, and utterance levels. The scores are produced by extracting(More)
This paper describes results of an experiment with 9 different DARPA Communicator Systems who participated in the June 2000 data collection. All systems supported travel planning and utilized some form of mixed-initiative interaction. However they varied in several critical dimensions: (1) They targeted different back-end databases for travel information;(More)
In this paper we present an approach to recognition confidence scoring and a set of techniques for integrating confidence scores into the understanding and dialogue components of a speech understanding system. The recognition component uses a multi-tiered approach where confidence scores are computed at the phonetic, word, and utterance levels. The scores(More)
Through efforts over the past fifteen years, we have acquired a great deal of experience in designing spoken dialogue systems that provide access to large corpora of data in a variety of different knowledge domains, such as flights, hotels, restaurants, weather, etc. In our recent research, we have begun to shift our focus towards developing tools that(More)
In this paper we report our efforts in data collection and performance evaluation in support of spoken dialogue system development. We describe two understanding metrics called query density and concept efficiency which can be interpreted on a perutterance basis, but which are measured over the course of a dialogue. We also describe the evaluation(More)
This paper describes our recent work in developing multilingual spoken language systems that support human-computer interactions. Our approach is based on the premise that a common semantic representation can be extracted from the input for all languages, at least within the context of restricted domains. In our design of such systems, language dependent(More)
Despite its long history, and a great deal of research producing many useful algorithms and observations, research in cooperative response generation has had little impact on the recent commercialization of dialogue technologies, particularly within the spoken dialogue community. We hypothesize that a particular type of cooperative response, intensional(More)