Pepi Stavropoulou

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Social Media provide a vast amount of information identifying stories, events, entities that play the crucial role of shaping the community in an everyday heavy user involvement. This work involves the study of social media information in terms of type (multimodal: text, video, sound, picture) and role players (agents, users, opinion leaders) and the(More)
Usability is a fundamental requirement for natural language interfaces. Usability evaluation reflects the impact of the interface and the acceptance from the users. This work examines the potential of usability evaluation in terms of issues and methodologies for spoken dialogue interfaces along with the appropriate designer-needs analysis. It unfolds the(More)
Adequate and reliable lexical resources are essential for effective sentiment analysis and opinion mining. This paper proposes a methodology for the emotional assessment and annotation of words. The process is based on the Self Assessment Manikin test, and is coupled with two psychometric measurements for identifying possible bias due to the annotator's(More)
Document-to-Audio accessibility assumes that all meaningful presen-taion elements in the document, such as bold, italics, tables or bullets, should be properly processed and acoustically modeled, in order to convey the intended meaning to the listeners in a complete and adequate manner. Similarly, several types of documents may contain reported speech and(More)
Information Structure (IS) is known to bear a significant effect on Prosody, making the identification of this effect crucial for improving the quality of synthetic speech. Recent theories identify contrast as a central IS element affecting accentuation. This paper presents the results of two experiments aiming to investigate the function of the different(More)
The vast amount of data on the web has been extensively harvested for many years for the purpose of digital archiving. In the recent years, however, the social networks contain the sources of most of the debating between the people. Recent approaches include social web information to the archived content for various reasons. This work reports on the(More)
Human-human spoken dialogues are considered an important tool for effective speech interface design and are often used for stochastic model training in speech based applications. However, the less restricted nature of human-human interaction compared to human-system interaction may undermine the usefulness of such corpora for creating effective and usable(More)
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