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Let’s be sensitive: social signals in human-computer interaction
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Sparsity Motivated Auditory Wavelet Representation and Blind Deconvolution
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Extraction of sign language information through biosignals ; Extração de informação gestual através de bio-sinais
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A pragmatic communication model for way-finding instructions ...
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Characterization of the Voice Source by the DCT for Speaker Information
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The Social Origins of Language
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In: Studies in the Evolution of Language: Vol.19. Oxford University Press: Oxford. (2014) (2014)
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Antonin artaud: a crueldade pelos desenhos e autorretratos
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Azevedo, Gerlúzia de Oliveira. - : Universidade Federal do Rio Grande do Norte, 2014. : BR, 2014. : UFRN, 2014. : Programa de Pós-Graduação em Ciências Sociais, 2014. : Desenvolvimento Regional; Cultura e Representações, 2014
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'Factum ex scientia': I Canadian Corps Intelligence during the Liri Valley Campaign, May – June 1944
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'Factum ex scientia': I Canadian Corps Intelligence during the Liri Valley Campaign, May – June 1944
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Detection and classification of non-stationary signals using sparse representations in adaptive dictionaries
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NEURONAL ENSEMBLE MODELING AND ANALYSIS WITH VARIABLE ORDER MARKOV MODELS
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Music And Speech Analysis Using The 'Bach' Scale Filter-Bank
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EFFECTS OF TEXT MARKERS AND FAMILIARITY ON COMPONENT STRUCTURES OF TEXT-BASED REPRESENTATIONS
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Mining Topic Signals from Text
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Abstract:
This work aims at studying the effect of word position in text on understanding and tracking the content of written text. In this thesis we present two uses of word position in text: topic word selectors and topic flow signals. The topic word selectors identify important words, called topic words , by their spread through a text. The underlying assumption here is that words that repeat across the text are likely to be more relevant to the main topic of the text than ones that are concentrated in small segments. Our experiments show that manually selected keywords correspond more closely to topic words extracted using these selectors than to words chosen using more traditional indexing techniques. This correspondence indicates that topic words identify the topical content of the documents more than words selected using the traditional indexing measures that do not utilize word position in text. The second approach to applying word position is through topic flow signals . In this representation, words are replaced by the topics to which they refer. The flow of any one topic can then be traced throughout the document and viewed as a signal that rises when a word relevant to the topic is used and falls when an irrelevant word occurs. To reflect the flow of the topic in larger segments of text we use a simple smoothing technique. The resulting smoothed signals are shown to be correlated to the ideal topic flow signals for the same document. Finally, we characterize documents using the importance of their topic words and the spread of these words in the document. When incorporated into a Support Vector Machine classifier, this representation is shown to drastically reduce the vocabulary size and improve the classifier's performance compared to the traditional word-based, vector space representation.
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Keyword:
Computer Science; topic characterization; topic flow signals; topic relevance measures; topic spread; topic word selectors; topic words
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URL: http://hdl.handle.net/10012/1165
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