Demetrios Karis

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In two experiments, each using a different product (either a CD-ROM based eleclxonic book or an interactive voice response system), we compared the usability problems uncovered using lowand high-fidelity prototypes. One group of subjects performed a series of tasks using a paperbased low-fidelity prototype, while another performed the same tasks using(More)
During the last decade there has been significant progress in the development of Automatic Speech Recognition (ASR) systems. As a result of technical advances in speech modeling techniques, recognition search strategies, and other areas, combined with the increased processing power of workstations and PCs, large vocabulary continuous speech recognition is(More)
There have been dramatic improvements during the last decade in the performance of both automatic speech recognition (ASR) systems and the computers on which they run. Speaker independent recognition with an active vocabulary of over 1,000 items is now possible even under the difficult conditions imposed by the public switched telephone network. The(More)
Speech recognition technology has made dramatic improvements in the last few years, and commercial products based on this technology are becoming increasingly common. Despite this progress, it has become clear that recognition performance in the lab is not a good predictor of success in the field, and that extensive work on dialogue design and human factors(More)
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